/**
* Function for initialization.
*/
GLUSboolean init(GLUSvoid)
{
GLubyte pixels[WIDTH * HEIGHT * BYTES_PER_PIXEL];
//
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
// Render (CPU) into pixel buffer
if (!renderToPixelBuffer(pixels, WIDTH, HEIGHT))
{
printf("Error: Could not render to pixel buffer.\n");
return GLUS_FALSE;
}
// Load full screen rendering shaders
glusFileLoadText("../Example37/shader/fullscreen.vert.glsl", &vertexSource);
glusFileLoadText("../Example37/shader/texture.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLchar**)&vertexSource.text, 0, 0, 0, (const GLchar**)&fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
g_textureLocation = glGetUniformLocation(g_program.program, "u_texture");
// Generate texture
glGenTextures(1, &g_texture);
glBindTexture(GL_TEXTURE_2D, g_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, WIDTH, HEIGHT, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
//
glUseProgram(g_program.program);
//
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
//
glBindTexture(GL_TEXTURE_2D, g_texture);
glUniform1i(g_textureLocation, 0);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
// Points of a triangle in normalized device coordinates.
GLfloat points[] = { -0.5f, 0.0f, 0.0f, 1.0f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.5f, 0.0f, 1.0f };
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
// Load the source of the vertex and fragment shader.
glusFileLoadText("../Example38/shader/simple.vert.glsl", &vertexSource);
glusFileLoadText("../Example38/shader/red.frag.glsl", &fragmentSource);
// Build the programs.
glusProgramBuildSeparableFromSource(&g_vertexProgram, GL_VERTEX_SHADER, (const GLchar**) &vertexSource.text);
glusProgramBuildSeparableFromSource(&g_fragmentProgram, GL_FRAGMENT_SHADER, (const GLchar**) &fragmentSource.text);
// Destroy the text resources.
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
// Build the program pipeline.
glusProgramPipelineBuild(&g_programPipeline, g_vertexProgram.program, 0, 0, 0, g_fragmentProgram.program);
//
// Retrieve the vertex location in the vertex program.
g_vertexLocation = glGetAttribLocation(g_vertexProgram.program, "a_vertex");
//
// Create and bind the VBO for the vertices.
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
// Transfer the vertices from CPU to GPU.
glBufferData(GL_ARRAY_BUFFER, 3 * 4 * sizeof(GLfloat), (GLfloat*) points, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
//
// Bind the program pipeline.
glBindProgramPipeline(g_programPipeline.pipeline);
// Create the VAO for the program pipeline.
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
// Bind the only used VBO in this example.
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
return GLUS_TRUE;
}
void initLightingProgram()
{
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSprogram glusProgram;
glusFileLoadText("../framework/lighting.vs.glsl", &vertexSource);
glusFileLoadText("../framework/lighting.fs.glsl", &fragmentSource);
glusProgramBuildFromSource(&glusProgram, const_cast<const GLUSchar **>(&vertexSource.text),
0, 0, 0, const_cast<const GLUSchar **>(&fragmentSource.text));
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
lightingProgram.loadUniforms(glusProgram.program);
}
GLuint loadProgram(const std::string &vertShaderFile, const std::string &fragShaderFile)
{
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSprogram program;
glusFileLoadText(vertShaderFile.c_str(), &vertexSource);
glusFileLoadText(fragShaderFile.c_str(), &fragmentSource);
glusProgramBuildFromSource(&program, const_cast<const GLUSchar**>(&vertexSource.text), 0, 0, 0, const_cast<const GLUSchar**>(&fragmentSource.text));
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
return program.program;
}
void initPointLightPass()
{
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSprogram glusProgram;
glusFileLoadText("./light_pass.vs", &vertexSource);
glusFileLoadText("./point_light_pass.fs", &fragmentSource);
glusProgramBuildFromSource(&glusProgram, const_cast<const GLUSchar **>(&vertexSource.text),
0, 0, 0, const_cast<const GLUSchar **>(&fragmentSource.text));
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
pointLightPass.loadUniforms(glusProgram.program);
}
void initGeometryPass()
{
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSprogram glusProgram;
glusFileLoadText("./geometry_pass.vs.glsl", &vertexSource);
glusFileLoadText("./geometry_pass.fs.glsl", &fragmentSource);
glusProgramBuildFromSource(&glusProgram, const_cast<const GLUSchar **>(&vertexSource.text),
0, 0, 0, const_cast<const GLUSchar **>(&fragmentSource.text));
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
geometryPass.loadUniforms(glusProgram.program);
}
void initShadowProgram()
{
GLUStextfile vertexSource;
GLUStextfile geometrySource;
GLUStextfile fragmentSource;
GLUSprogram glusProgram;
glusFileLoadText("./shadow.vs.glsl", &vertexSource);
glusFileLoadText("./shadow.gs.glsl", &geometrySource);
glusFileLoadText("./shadow.fs.glsl", &fragmentSource);
glusProgramBuildFromSource(&glusProgram, const_cast<const GLUSchar **>(&vertexSource.text),
0, 0, const_cast<const GLUSchar **>(&geometrySource.text),
const_cast<const GLUSchar **>(&fragmentSource.text));
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&geometrySource);
glusFileDestroyText(&fragmentSource);
shadowProgram.loadUniforms(glusProgram.program);
}
ProgramData loadProgram(const std::string &vertShaderFile, const std::string &fragShaderFile)
{
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSprogram program;
glusFileLoadText(vertShaderFile.c_str(), &vertexSource);
glusFileLoadText(fragShaderFile.c_str(), &fragmentSource);
glusProgramBuildFromSource(&program, const_cast<const GLUSchar**>(&vertexSource.text), 0, 0, 0, const_cast<const GLUSchar**>(&fragmentSource.text));
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
ProgramData programData;
programData.program = program.program;
programData.modelViewUnif = glGetUniformLocation(program.program, "modelViewMatrix");
GLuint projectionUnif = glGetUniformBlockIndex(program.program, "Projection");
glUniformBlockBinding(program.program, projectionUnif, g_projectionBlockIndex);
return programData;
}
GLUSboolean init(GLUSvoid)
{
GLUSshape plane;
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUStgaimage image;
GLfloat normalMatrix[9];
glusFileLoadText("../Example07/shader/normmap.vert.glsl", &vertexSource);
glusFileLoadText("../Example07/shader/normmap.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_modelViewMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_lightDirectionLocation = glGetUniformLocation(g_program.program, "u_lightDirection");
// One texture for the color and one for the normals.
g_textureLocation = glGetUniformLocation(g_program.program, "u_texture");
g_normalMapLocation = glGetUniformLocation(g_program.program, "u_normalMap");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
// The tangent, bitangent and normal do define the tangent space. They are defined in object space, the inverse brings coordinates back to this tangent space.
g_tangentLocation = glGetAttribLocation(g_program.program, "a_tangent");
g_bitangentLocation = glGetAttribLocation(g_program.program, "a_bitangent");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
g_texCoordLocation = glGetAttribLocation(g_program.program, "a_texCoord");
//
glusImageLoadTga("rock_color.tga", &image);
glGenTextures(1, &g_texture);
glBindTexture(GL_TEXTURE_2D, g_texture);
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
glusImageLoadTga("rock_normal.tga", &image);
glGenTextures(1, &g_normalMap);
glBindTexture(GL_TEXTURE_2D, g_normalMap);
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
//
glusShapeCreatePlanef(&plane, 1.5f);
g_numberIndicesPlane = plane.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) plane.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_tangentsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_tangentsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) plane.tangents, GL_STATIC_DRAW);
glGenBuffers(1, &g_bitangentsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_bitangentsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) plane.bitangents, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) plane.normals, GL_STATIC_DRAW);
glGenBuffers(1, &g_texCoordsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 2 * sizeof(GLfloat), (GLfloat*) plane.texCoords, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, g_numberIndicesPlane * sizeof(GLuint), (GLuint*) plane.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&plane);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_tangentsVBO);
glVertexAttribPointer(g_tangentLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_tangentLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_bitangentsVBO);
glVertexAttribPointer(g_bitangentLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_bitangentLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glVertexAttribPointer(g_texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_texCoordLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
glusMatrix4x4LookAtf(g_viewMatrix, 0.0f, 0.0f, 5.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
glUniformMatrix4fv(g_modelViewMatrixLocation, 1, GL_FALSE, g_viewMatrix);
glusMatrix4x4ExtractMatrix3x3f(normalMatrix, g_viewMatrix);
glUniformMatrix3fv(g_normalMatrixLocation, 1, GL_FALSE, normalMatrix);
//
// Activate and bind first ...
glUniform1i(g_textureLocation, 0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, g_texture);
// .. and second texture.
glUniform1i(g_normalMapLocation, 1);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, g_normalMap);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLfloat lightDirection[3] = { 1.0f, 1.0f, 1.0f };
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUStgaimage image;
GLUSshape cube;
glusFileLoadText("../Example06/shader/basic.vert.glsl", &vertexSource);
glusFileLoadText("../Example06/shader/texture.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
// Retrieve the uniform locations in the program.
g_viewProjectionMatrixLocation = glGetUniformLocation(g_program.program, "u_viewProjectionMatrix");
g_modelMatrixLocation = glGetUniformLocation(g_program.program, "u_modelMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_lightDirectionLocation = glGetUniformLocation(g_program.program, "u_lightDirection");
g_textureLocation = glGetUniformLocation(g_program.program, "u_texture");
// Retrieve the attribute locations in the program.
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
g_texCoordLocation = glGetAttribLocation(g_program.program, "a_texCoord");
//
// Texture set up.
glusImageLoadTga("crate.tga", &image);
glGenTextures(1, &g_texture);
glBindTexture(GL_TEXTURE_2D, g_texture);
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
// Mipmap generation is now included in OpenGL 3 and above
glGenerateMipmap(GL_TEXTURE_2D);
// Trilinear filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
//
glusShapeCreateCubef(&cube, 0.5f);
g_numberIndicesSphere = cube.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, cube.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) cube.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, cube.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) cube.normals, GL_STATIC_DRAW);
glGenBuffers(1, &g_texCoordsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glBufferData(GL_ARRAY_BUFFER, cube.numberVertices * 2 * sizeof(GLfloat), (GLfloat*) cube.texCoords, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, cube.numberIndices * sizeof(GLuint), (GLuint*) cube.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&cube);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glVertexAttribPointer(g_texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_texCoordLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
glusVector3Normalizef(lightDirection);
glUniform3fv(g_lightDirectionLocation, 1, lightDirection);
//
glBindTexture(GL_TEXTURE_2D, g_texture);
glUniform1i(g_textureLocation, 0);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUStgaimage image;
GLUSshape plane;
glusFileLoadText("shader/texture.vert.glsl", &vertexSource);
glusFileLoadText("shader/grey.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLchar**) &vertexSource.text, 0, 0, 0, (const GLchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
// Retrieve the uniform locations in the program.
g_modelViewProjectionMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewProjectionMatrix");
g_textureLocation = glGetUniformLocation(g_program.program, "u_texture");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_texCoordLocation = glGetAttribLocation(g_program.program, "a_texCoord");
//
// Load the image.
glusImageLoadTga("../../media/desert.tga", &image);
// Generate and bind a texture.
glGenTextures(1, &g_texture);
glBindTexture(GL_TEXTURE_2D, g_texture);
// Transfer the image data from the CPU to the GPU.
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
// Setting the texture parameters.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
//
// Use a helper function to create a rectangular plane.
glusShapeCreateRectangularPlanef(&plane, (GLfloat) image.width / 2.0f, (GLfloat) image.height / 2.0f);
// Destroying now the image, as the width and height was used above.
glusImageDestroyTga(&image);
// Store the number indices, as we will render with glDrawElements.
g_numberIndicesPlane = plane.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) plane.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_texCoordsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 2 * sizeof(GLfloat), (GLfloat*) plane.texCoords, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// Generate a VBO for the indices.
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, plane.numberIndices * sizeof(GLuint), (GLuint*) plane.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
// Now we can destroy the shape, as all data is now on the GPU.
glusShapeDestroyf(&plane);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glVertexAttribPointer(g_texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_texCoordLocation);
// Also bind the indices to the VAO.
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
// Also bind created texture ...
glBindTexture(GL_TEXTURE_2D, g_texture);
// ... and as this is texture number 0, bind the uniform to the program.
glUniform1i(g_textureLocation, 0);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLUSshape background;
GLUSshape torus;
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLfloat viewMatrix[16];
GLfloat lightDirection[3];
lightDirection[0] = g_lightDirection[0];
lightDirection[1] = g_lightDirection[1];
lightDirection[2] = g_lightDirection[2];
glusVector3Normalizef(lightDirection);
//
glusFileLoadText("../Example27/shader/shadow.vert.glsl", &vertexSource);
glusFileLoadText("../Example27/shader/shadow.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_programShadow, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
glusFileLoadText("../Example27/shader/color.vert.glsl", &vertexSource);
glusFileLoadText("../Example27/shader/color.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixShadowLocation = glGetUniformLocation(g_programShadow.program, "u_projectionMatrix");
g_viewMatrixShadowLocation = glGetUniformLocation(g_programShadow.program, "u_viewMatrix");
g_shadowProjectionMatrixShadowLocation = glGetUniformLocation(g_programShadow.program, "u_shadowProjectionMatrix");
g_modelMatrixShadowLocation = glGetUniformLocation(g_programShadow.program, "u_modelMatrix");
g_vertexShadowLocation = glGetAttribLocation(g_programShadow.program, "a_vertex");
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_viewMatrixLocation = glGetUniformLocation(g_program.program, "u_viewMatrix");
g_modelMatrixLocation = glGetUniformLocation(g_program.program, "u_modelMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_colorLocation = glGetUniformLocation(g_program.program, "u_shapeColor");
g_lightDirectionLocation = glGetUniformLocation(g_program.program, "u_lightDirection");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
glusShapeCreateTorusf(&torus, 0.5f, 1.0f, 32, 32);
g_numberIndicesTorus = torus.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, torus.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) torus.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, torus.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) torus.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, torus.numberIndices * sizeof(GLuint), (GLuint*) torus.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&torus);
//
glusShapeCreatePlanef(&background, 10.0f);
g_numberIndicesBackground = background.numberIndices;
glGenBuffers(1, &g_verticesBackgroundVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesBackgroundVBO);
glBufferData(GL_ARRAY_BUFFER, background.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) background.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsBackgroundVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsBackgroundVBO);
glBufferData(GL_ARRAY_BUFFER, background.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) background.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesBackgroundVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesBackgroundVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, background.numberIndices * sizeof(GLuint), (GLuint*) background.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&background);
//
glUseProgram(g_program.program);
glusMatrix4x4LookAtf(viewMatrix, g_cameraPosition[0], g_cameraPosition[1], g_cameraPosition[2], 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
glusMatrix4x4MultiplyVector3f(lightDirection, viewMatrix, lightDirection);
glUniform3fv(g_lightDirectionLocation, 1, lightDirection);
// Torus
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
// Plane
glGenVertexArrays(1, &g_vaoBackground);
glBindVertexArray(g_vaoBackground);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesBackgroundVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsBackgroundVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesBackgroundVBO);
//
glUseProgram(g_programShadow.program);
// Torus
glGenVertexArrays(1, &g_vaoShadow);
glBindVertexArray(g_vaoShadow);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexShadowLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexShadowLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLUSshape sphere;
GLUStextfile vertexSource;
GLUStextfile geometrySource;
GLUStextfile fragmentSource;
glusFileLoadText("../Example10/shader/dublicate.vert.glsl", &vertexSource);
glusFileLoadText("../Example10/shader/dublicate.geom.glsl", &geometrySource);
glusFileLoadText("../Example10/shader/dublicate.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, (const GLUSchar**) &geometrySource.text, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&geometrySource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_viewMatrixLocation = glGetUniformLocation(g_program.program, "u_viewMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_lightPositionLocation = glGetUniformLocation(g_program.program, "u_lightPosition");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
glusShapeCreateSpheref(&sphere, 1.0f, 32);
g_numberIndicesSphere = sphere.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, sphere.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) sphere.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, sphere.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) sphere.normals, GL_STATIC_DRAW);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sphere.numberIndices * sizeof(GLuint), (GLuint*) sphere.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&sphere);
//
glUseProgram(g_program.program);
glusMatrix4x4LookAtf(g_viewMatrix, 0.0f, 0.0f, 6.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
glUniformMatrix4fv(g_viewMatrixLocation, 1, GL_FALSE, g_viewMatrix);
glusMatrix4x4ExtractMatrix3x3f(g_normalMatrix, g_viewMatrix);
glUniformMatrix3fv(g_normalMatrixLocation, 1, GL_FALSE, g_normalMatrix);
glusMatrix4x4MultiplyPoint4f(g_lightPosition, g_viewMatrix, g_lightPosition);
glUniform4fv(g_lightPositionLocation, 1, g_lightPosition);
//
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
return GLUS_TRUE;
}
GLUSboolean GLUSAPIENTRY glusFileLoadText(const GLUSchar* filename, GLUStextfile* textfile)
{
FILE* f;
size_t elementsRead;
if (!filename || !textfile)
{
return GLUS_FALSE;
}
textfile->text = 0;
textfile->length = 0;
f = fopen(filename, "rb");
if (!f)
{
return GLUS_FALSE;
}
if (fseek(f, 0, SEEK_END))
{
fclose(f);
return GLUS_FALSE;
}
textfile->length = ftell(f);
if (textfile->length < 0 || textfile->length == GLUS_MAX_TEXTFILE_LENGTH)
{
fclose(f);
textfile->length = 0;
return GLUS_FALSE;
}
textfile->text = (GLUSchar*)glusMemoryMalloc((size_t)textfile->length + 1);
if (!textfile->text)
{
fclose(f);
textfile->length = 0;
return GLUS_FALSE;
}
memset(textfile->text, 0, (size_t)textfile->length + 1);
rewind(f);
elementsRead = fread(textfile->text, 1, (size_t)textfile->length, f);
if (!_glusFileCheckRead(f, elementsRead, (size_t)textfile->length))
{
glusFileDestroyText(textfile);
return GLUS_FALSE;
}
fclose(f);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
// This is a white light.
struct LightProperties light = { { 1.0f, 1.0f, 1.0f }, { 0.3f, 0.3f, 0.3f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f } };
// Green color material with white specular color, half transparent.
struct MaterialProperties material = { { 0.0f, 1.0f, 0.0f, 1.0f }, { 0.0f, 1.0f, 0.0f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, 20.0f, 0.5f };
static GLfloat biasMatrix[] = { 0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.5f, 0.0f, 0.5f, 0.5f, 0.5f, 1.0f };
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSshape wavefrontObj;
glusFileLoadText("shader/phong_depth_peel.vert.glsl", &vertexSource);
glusFileLoadText("shader/phong_depth_peel.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_biasMatrixLocation = glGetUniformLocation(g_program.program, "u_biasMatrix");
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_modelViewMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_light.directionLocation = glGetUniformLocation(g_program.program, "u_light.direction");
g_light.ambientColorLocation = glGetUniformLocation(g_program.program, "u_light.ambientColor");
g_light.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_light.diffuseColor");
g_light.specularColorLocation = glGetUniformLocation(g_program.program, "u_light.specularColor");
g_material.ambientColorLocation = glGetUniformLocation(g_program.program, "u_material.ambientColor");
g_material.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_material.diffuseColor");
g_material.specularColorLocation = glGetUniformLocation(g_program.program, "u_material.specularColor");
g_material.specularExponentLocation = glGetUniformLocation(g_program.program, "u_material.specularExponent");
g_material.alphaLocation = glGetUniformLocation(g_program.program, "u_material.alpha");
g_peelTextureLocation = glGetUniformLocation(g_program.program, "u_peelTexture");
g_layerLocation = glGetUniformLocation(g_program.program, "u_layer");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
glusFileLoadText("shader/fullscreen_blend.vert.glsl", &vertexSource);
glusFileLoadText("shader/fullscreen_blend.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_blendFullscreenProgram, (const GLchar**)&vertexSource.text, 0, 0, 0, (const GLchar**)&fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_framebufferTextureBlendFullscreenLocation = glGetUniformLocation(g_blendFullscreenProgram.program, "u_framebufferTexture");
g_layersBlendFullscreenLocation = glGetUniformLocation(g_blendFullscreenProgram.program, "u_layers");
//
// Use a helper function to load an wavefront object file.
glusShapeLoadWavefront("../../media/dragon.obj", &wavefrontObj);
g_numberVertices = wavefrontObj.numberVertices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, wavefrontObj.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) wavefrontObj.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, wavefrontObj.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) wavefrontObj.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glusShapeDestroyf(&wavefrontObj);
//
//
// Setting up the frame buffer.
//
glGenTextures(1, &g_colorTexture);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D_ARRAY, g_colorTexture);
glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA, SCREEN_WIDTH, SCREEN_HEIGHT, LAYERS, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
//
glGenTextures(2, g_depthTexture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, g_depthTexture[0]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, SCREEN_WIDTH, SCREEN_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
// Peel depth test "function". See shader for more information.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_GREATER);
glBindTexture(GL_TEXTURE_2D, g_depthTexture[1]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, SCREEN_WIDTH, SCREEN_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
// Peel depth test "function". See shader for more information.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_GREATER);
glBindTexture(GL_TEXTURE_2D, 0);
//
glGenFramebuffers(1, &g_blendFullscreenFBO);
glBindFramebuffer(GL_FRAMEBUFFER, g_blendFullscreenFBO);
// Attach the color buffer ...
glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, g_colorTexture, 0, 0);
// ... and the depth buffer,
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, g_depthTexture[1], 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
printf("GL_FRAMEBUFFER_COMPLETE error 0x%x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
return GLUS_FALSE;
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
//
glUseProgram(g_blendFullscreenProgram.program);
glGenVertexArrays(1, &g_blendFullscreenVAO);
glBindVertexArray(g_blendFullscreenVAO);
glUniform1i(g_framebufferTextureBlendFullscreenLocation, 0);
glUniform1i(g_layersBlendFullscreenLocation, LAYERS);
glBindVertexArray(0);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindVertexArray(0);
//
glusMatrix4x4LookAtf(g_viewMatrix, 0.0f, 0.0f, 3.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
//
glusVector3Normalizef(light.direction);
// Transform light to camera space, as it is currently in world space.
glusMatrix4x4MultiplyVector3f(light.direction, g_viewMatrix, light.direction);
// Set up light ...
glUniform3fv(g_light.directionLocation, 1, light.direction);
glUniform4fv(g_light.ambientColorLocation, 1, light.ambientColor);
glUniform4fv(g_light.diffuseColorLocation, 1, light.diffuseColor);
glUniform4fv(g_light.specularColorLocation, 1, light.specularColor);
// ... and material values.
glUniform4fv(g_material.ambientColorLocation, 1, material.ambientColor);
glUniform4fv(g_material.diffuseColorLocation, 1, material.diffuseColor);
glUniform4fv(g_material.specularColorLocation, 1, material.specularColor);
glUniform1f(g_material.specularExponentLocation, material.specularExponent);
glUniform1f(g_material.alphaLocation, material.alpha);
glUniform1i(g_peelTextureLocation, 1);
glUniformMatrix4fv(g_biasMatrixLocation, 1, GL_FALSE, biasMatrix);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLfloat lightDirection[3] = { 1.0f, 1.0f, 1.0f };
GLfloat color[4] = { 1.0f, 0.0f, 0.0f, 1.0f };
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSshape cube;
glusFileLoadText("../Example04_ES/shader/basic.vert.glsl", &vertexSource);
glusFileLoadText("../Example04_ES/shader/color.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
// Retrieve the uniform locations in the program.
g_modelViewProjectionMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewProjectionMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_lightDirectionLocation = glGetUniformLocation(g_program.program, "u_lightDirection");
g_colorLocation = glGetUniformLocation(g_program.program, "u_color");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
// Use a helper function to create a cube.
glusShapeCreateCubef(&cube, 0.5f);
// Store the number indices, as we will render with glDrawElements.
g_numberIndicesCube = cube.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, cube.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) cube.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, cube.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) cube.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// Generate a VBO for the indices.
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, cube.numberIndices * sizeof(GLuint), (GLuint*) cube.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&cube);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
// Light direction needs to have unit length. This light direction is given in world space.
glusVector3Normalizef(lightDirection);
// Set the light direction ...
glUniform3fv(g_lightDirectionLocation, 1, lightDirection);
// ... and the red color (ambient and diffuse) for the cube.
glUniform4fv(g_colorLocation, 1, color);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
// Setting default clear depth value.
glClearDepthf(1.0f);
// Enable depth testing.
glEnable(GL_DEPTH_TEST);
// Enable back face culling.
glEnable(GL_CULL_FACE);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUStgaimage image;
GLUSshape plane;
//
glusMatrix4x4LookAtf(g_viewMatrix, g_camera.eye[0], g_camera.eye[1], g_camera.eye[2], g_camera.center[0], g_camera.center[1], g_camera.center[2], g_camera.up[0], g_camera.up[1], g_camera.up[2]);
//
if (!initWavefront(g_viewMatrix, &g_light))
{
return GLUS_FALSE;
}
//
glusFileLoadText("../Example19_ES/shader/basic_proj.vert.glsl", &vertexSource);
glusFileLoadText("../Example19_ES/shader/texture_multi_proj.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
// Retrieve the uniform locations in the program.
g_viewProjectionMatrixLocation = glGetUniformLocation(g_program.program, "u_viewProjectionMatrix");
g_viewProjectionBiasTextureMatrixLocation = glGetUniformLocation(g_program.program, "u_viewProjectionBiasTextureMatrix");
g_modelMatrixLocation = glGetUniformLocation(g_program.program, "u_modelMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_lightDirectionLocation = glGetUniformLocation(g_program.program, "u_lightDirection");
g_repeatLocation = glGetUniformLocation(g_program.program, "u_repeat");
g_textureLocation = glGetUniformLocation(g_program.program, "u_texture");
g_mirrorTextureLocation = glGetUniformLocation(g_program.program, "u_mirrorTexture");
// Retrieve the attribute locations in the program.
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
g_texCoordLocation = glGetAttribLocation(g_program.program, "a_texCoord");
//
// Texture set up.
glusImageLoadTga("ice.tga", &image);
glGenTextures(1, &g_texture);
glBindTexture(GL_TEXTURE_2D, g_texture);
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
// Mipmap generation is now included in OpenGL 3 and above
glGenerateMipmap(GL_TEXTURE_2D);
// Trilinear filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
//
// Setting up the offscreen frame buffer.
//
glGenTextures(1, &g_mirrorTexture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, g_mirrorTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GLUS_RGB, TEXTURE_WIDTH, TEXTURE_HEIGHT, 0, GLUS_RGB, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, 0);
//
glGenRenderbuffers(1, &g_depthMirrorTexture);
glBindRenderbuffer(GL_RENDERBUFFER, g_depthMirrorTexture);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, TEXTURE_WIDTH, TEXTURE_HEIGHT);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
//
glGenFramebuffers(1, &g_fboMirrorTexture);
glBindFramebuffer(GL_FRAMEBUFFER, g_fboMirrorTexture);
// Attach the color buffer ...
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, g_mirrorTexture, 0);
// ... and the depth buffer,
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, g_depthMirrorTexture);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
printf("GL_FRAMEBUFFER_COMPLETE error 0x%x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
return GLUS_FALSE;
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
//
//
//
glusShapeCreatePlanef(&plane, 3.0f);
g_numberIndicesSphere = plane.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) plane.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) plane.normals, GL_STATIC_DRAW);
glGenBuffers(1, &g_texCoordsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 2 * sizeof(GLfloat), (GLfloat*) plane.texCoords, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, plane.numberIndices * sizeof(GLuint), (GLuint*) plane.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&plane);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glVertexAttribPointer(g_texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_texCoordLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, g_texture);
glUniform1i(g_textureLocation, 0);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, g_mirrorTexture);
glUniform1i(g_mirrorTextureLocation, 1);
// How many times the surface texture is repeated.
glUniform1f(g_repeatLocation, 6.0f);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepthf(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLUSshape torus;
GLUSshape backgroundSphere;
GLUStgaimage image;
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
glusFileLoadText("shader/glass.vert.glsl", &vertexSource);
glusFileLoadText("shader/glass.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
glusFileLoadText("shader/background.vert.glsl", &vertexSource);
glusFileLoadText("shader/background.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_programBackground, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_viewProjectionMatrixLocation = glGetUniformLocation(g_program.program, "u_viewProjectionMatrix");
g_modelMatrixLocation = glGetUniformLocation(g_program.program, "u_modelMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_cameraLocation = glGetUniformLocation(g_program.program, "u_camera");
g_cubemapLocation = glGetUniformLocation(g_program.program, "u_cubemap");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
g_viewProjectionMatrixBackgroundLocation = glGetUniformLocation(g_programBackground.program, "u_viewProjectionMatrix");
g_modelMatrixBackgroundLocation = glGetUniformLocation(g_programBackground.program, "u_modelMatrix");
g_cubemapBackgroundLocation = glGetUniformLocation(g_programBackground.program, "u_cubemap");
g_vertexBackgroundLocation = glGetAttribLocation(g_programBackground.program, "a_vertex");
//
glGenTextures(1, &g_cubemap);
glBindTexture(GL_TEXTURE_CUBE_MAP, g_cubemap);
glusImageLoadTga("../../media/cm_pos_x.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("../../media/cm_neg_x.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("../../media/cm_pos_y.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("../../media/cm_neg_y.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("../../media/cm_pos_z.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("../../media/cm_neg_z.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
//
glusShapeCreateTorusf(&torus, 0.25f, 1.0f, 32, 32);
g_numberIndicesSphere = torus.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, torus.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) torus.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, torus.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) torus.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, torus.numberIndices * sizeof(GLuint), (GLuint*) torus.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&torus);
//
glusShapeCreateSpheref(&backgroundSphere, g_circleRadius, 32);
g_numberIndicesBackground = backgroundSphere.numberIndices;
glGenBuffers(1, &g_verticesBackgroundVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesBackgroundVBO);
glBufferData(GL_ARRAY_BUFFER, backgroundSphere.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) backgroundSphere.vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesBackgroundVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesBackgroundVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, backgroundSphere.numberIndices * sizeof(GLuint), (GLuint*) backgroundSphere.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&backgroundSphere);
//
glUseProgram(g_program.program);
glUniform1i(g_cubemapLocation, 0);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
glUseProgram(g_programBackground.program);
glUniform1i(g_cubemapBackgroundLocation, 0);
glGenVertexArrays(1, &g_vaoBackground);
glBindVertexArray(g_vaoBackground);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesBackgroundVBO);
glVertexAttribPointer(g_vertexBackgroundLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexBackgroundLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesBackgroundVBO);
//
glBindTexture(GL_TEXTURE_CUBE_MAP, g_cubemap);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
return GLUS_TRUE;
}
int main(int argc, char* argv[])
{
GLUSchar* output;
GLUSchar* extension;
GLUSchar fileType[MAX_FILETYPE_LENGTH];
GLUSchar buffer[MAX_FILENAME_LENGTH];
GLUSint roughnessSamples;
GLUSuint exponent;
GLUSuint samples;
GLUSint i, k, m, o, p, q, ouputLength;
GLUSuint x = 0;
GLUSuint y = 0;
GLUSboolean isHDR = GLUS_FALSE;
GLUStgaimage tgaOutput[2];
GLUShdrimage hdrOutput[2];
GLUSboolean mipMap;
GLUSint length;
GLUSint lengthExponent;
GLUSint stride;
GLUSfloat offset, step, roughness;
GLUSfloat startVector[3] = { 1.0f, -1.0f, -1.0f };
GLUSfloat offsetVector[3];
GLUSfloat normalVector[3];
GLUSfloat* scanVectors;
GLUSfloat* colorBufferLambert;
GLUSfloat* colorBufferCookTorrance;
GLUSfloat matrix[9];
GLUStextfile computeSource;
GLUSprogram computeProgram;
GLUSuint localSize = 16;
GLUSuint textureLambert;
GLUSuint textureCookTorrance[MAX_ROUGHNESS];
GLUSuint scanVectorsSSBO;
GLUSint mLocation;
GLUSint samplesLocation;
GLUSint binaryFractionFactorLocation;
GLUSint roughnessLocation;
EGLint eglConfigAttributes[] = {
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_DEPTH_SIZE, 0,
EGL_STENCIL_SIZE, 0,
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
EGL_NONE
};
EGLint eglContextAttributes[] = {
EGL_CONTEXT_MAJOR_VERSION, 4,
EGL_CONTEXT_MINOR_VERSION, 3,
EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE, EGL_TRUE,
EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
EGL_NONE
};
if (argc != 12)
{
printf("Usage: PreFilterCubeMap.exe [Pos X] [Neg X] [Pos Y] [Neg Y] [Pos Z] [Neg Z] [Output] [Roughness] [Samples 2^m] [Length 2^n] [As MipMap]\n");
return -1;
}
//
output = argv[7];
ouputLength = strlen(output);
if (ouputLength >= MAX_FILENAME_LENGTH - (MAX_FILETYPE_LENGTH - 1) - SIDE_NAMING_LENGTH - ROUGHNESS_NAMING_LENGTH - TYPE_NAMING_LENGTH)
{
printf("Error: Output filename too long.\n");
return -1;
}
roughnessSamples = atoi(argv[8]);
if (roughnessSamples < 2 || roughnessSamples >= MAX_ROUGHNESS)
{
printf("Error: Invalid roughness value.\n");
return -1;
}
exponent = (GLUSuint)atoi(argv[9]);
if (exponent > 16)
{
printf("Error: Invalid samples value.\n");
return -1;
}
samples = 1 << exponent;
lengthExponent = (GLUSuint)atoi(argv[10]);
if (lengthExponent > 16)
{
printf("Error: Invalid length value.\n");
return -1;
}
length = 1 << lengthExponent;
mipMap = (GLUSuint)atoi(argv[11]) != 0;
if (mipMap && roughnessSamples - 1 > lengthExponent)
{
printf("Error: Can not do mip mapping with given roughness and length.\n");
return -1;
}
//
extension = strrchr(argv[1], '.');
if (extension == 0)
{
printf("Error: No file type found.\n");
return -1;
}
if (strlen(extension) != MAX_FILETYPE_LENGTH - 1)
{
printf("Error: Invalid file type.\n");
return -1;
}
// Copy includes NULL terminating character.
for (i = 0; i < MAX_FILETYPE_LENGTH ; i++)
{
fileType[i] = tolower(extension[i]);
}
stride = 1;
printf("Loading texture cube maps ... ");
if (strcmp(fileType, ".tga") == 0)
{
//
for (i = 0; i < 6; i++)
{
if (!glusImageLoadTga(argv[1 + i], &g_tgaimage[i]))
{
printf("failed! TGA image could not be loaded.\n");
freeTgaImages(i);
return -1;
}
if (i > 0)
{
if (g_tgaimage[0].width != g_tgaimage[i].width || g_tgaimage[0].height != g_tgaimage[i].height)
{
printf("failed! TGA images do have different dimension.\n");
freeTgaImages(i + 1);
return -1;
}
}
else
{
if (g_tgaimage[0].width != g_tgaimage[i].height)
{
printf("failed! TGA images do have different dimension.\n");
freeTgaImages(1);
return -1;
}
}
}
if (g_tgaimage[0].format == GLUS_RGB)
{
stride = 3;
}
else if (g_tgaimage[0].format == GLUS_RGBA)
{
stride = 4;
}
//
tgaOutput[0] = g_tgaimage[0];
tgaOutput[0].width = length;
tgaOutput[0].height = length;
tgaOutput[0].data = (GLUSubyte*)malloc(length * length * stride * sizeof(GLUSubyte));
if (!tgaOutput[0].data)
{
printf("failed! TGA output image could not be created.\n");
freeTgaImages(6);
return -1;
}
tgaOutput[1] = g_tgaimage[0];
tgaOutput[1].width = length;
tgaOutput[1].height = length;
tgaOutput[1].data = (GLUSubyte*)malloc(length * length * stride * sizeof(GLUSubyte));
if (!tgaOutput[1].data)
{
printf("failed! TGA output image could not be created.\n");
freeTgaImages(6);
glusImageDestroyTga(&tgaOutput[0]);
return -1;
}
}
else if (strcmp(fileType, ".hdr") == 0)
{
isHDR = GLUS_TRUE;
for (i = 0; i < 6; i++)
{
if (!glusImageLoadHdr(argv[1 + i], &g_hdrimage[i]))
{
printf("failed! HDR image could not be loaded.\n");
freeHdrImages(i);
return -1;
}
if (i > 0)
{
if (g_hdrimage[0].width != g_hdrimage[i].width || g_hdrimage[0].height != g_hdrimage[i].height)
{
printf("failed! HDR images do have different dimension.\n");
freeHdrImages(i + 1);
return -1;
}
}
else
{
if (g_hdrimage[0].width != g_hdrimage[i].height)
{
printf("failed! HDR images do have different dimension.\n");
freeHdrImages(1);
return -1;
}
}
}
stride = 3;
//
hdrOutput[0] = g_hdrimage[0];
hdrOutput[0].width = length;
hdrOutput[0].height = length;
hdrOutput[0].data = (GLUSfloat*)malloc(length * length * stride * sizeof(GLUSfloat));
if (!hdrOutput[0].data)
{
printf("failed! HDR output image could not be created.\n");
freeHdrImages(6);
return -1;
}
hdrOutput[1] = g_hdrimage[0];
hdrOutput[1].width = length;
hdrOutput[1].height = length;
hdrOutput[1].data = (GLUSfloat*)malloc(length * length * stride * sizeof(GLUSfloat));
if (!hdrOutput[1].data)
{
printf("failed! HDR output image could not be created.\n");
freeHdrImages(6);
glusImageDestroyHdr(&hdrOutput[1]);
return -1;
}
}
else
{
printf("failed. Unknown file type.\n");
return -1;
}
printf("completed!\n");
// Contains the vectors to scan and generate one side of the pre-filtered cube map.
scanVectors = (GLUSfloat*)malloc(length * length * (3 + 1) * sizeof(GLUSfloat));
if (!scanVectors)
{
printf("Error: Scan scanVectors could not be created.\n");
freeHdrImages(6);
return -1;
}
// Color buffer needed to gather the pixels from the texture.
colorBufferLambert = (GLUSfloat*)malloc(length * length * 4 * sizeof(GLUSfloat));
if (!colorBufferLambert)
{
printf("Error: Color buffer could not be created.\n");
freeHdrImages(6);
free(scanVectors);
return -1;
}
// Color buffer needed to gather the pixels from the texture.
colorBufferCookTorrance = (GLUSfloat*)malloc(length * length * 4 * sizeof(GLUSfloat));
if (!colorBufferCookTorrance)
{
printf("Error: Color buffer could not be created.\n");
freeHdrImages(6);
free(scanVectors);
free(colorBufferLambert);
return -1;
}
//
// Initialize OpenGL, as it is needed for the compute shader.
//
if (!glusWindowCreate("GLUS Example Window", 512, 512, GLUS_FALSE, GLUS_FALSE, eglConfigAttributes, eglContextAttributes))
{
printf("Could not create window!\n");
return -1;
}
if (!glusWindowStartup())
{
return -1;
}
//
// Compute shader for pre-filtering.
//
glusFileLoadText("../PreFilterCubeMap/shader/prefilter.comp.glsl", &computeSource);
glusProgramBuildComputeFromSource(&computeProgram, (const GLchar**)&computeSource.text);
glusFileDestroyText(&computeSource);
//
mLocation = glGetUniformLocation(computeProgram.program, "u_m");
samplesLocation = glGetUniformLocation(computeProgram.program, "u_samples");
binaryFractionFactorLocation = glGetUniformLocation(computeProgram.program, "u_binaryFractionFactor");
roughnessLocation = glGetUniformLocation(computeProgram.program, "u_roughness");
//
glUseProgram(computeProgram.program);
//
//
//
// Create cube maps
if (isHDR)
{
createHdrCubeMap();
freeHdrImages(6);
}
else
{
createTgaCubeMap();
freeTgaImages(6);
}
// Prepare texture, where the pre-filtered image is stored: Lambert
glGenTextures(1, &textureLambert);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, textureLambert);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, length, length, 0, GL_RGBA, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// see binding = 1 in the shader
glBindImageTexture(1, textureLambert, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
//
if (mipMap)
{
// Prepare texture, where the pre-filtered image is stored: Cook-Torrance
glGenTextures(roughnessSamples, textureCookTorrance);
for (i = 0; i < roughnessSamples; i++)
{
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, textureCookTorrance[i]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, length, length, 0, GL_RGBA, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
length /= 2;
}
length = 1 << lengthExponent;
}
else
{
// Prepare texture, where the pre-filtered image is stored: Cook-Torrance
glGenTextures(1, textureCookTorrance);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, textureCookTorrance[0]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, length, length, 0, GL_RGBA, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// see binding = 2 in the shader
glBindImageTexture(2, textureCookTorrance[0], 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
}
//
//
//
step = 2.0f / (GLUSfloat)length;
offset = step * 0.5f;
// Prepare save name.
strcpy(buffer, output);
buffer[ouputLength + 0] = '_';
buffer[ouputLength + 4] = '_';
buffer[ouputLength + 6] = '_';
buffer[ouputLength + 9] = '_';
for (i = ouputLength + SIDE_NAMING_LENGTH + ROUGHNESS_NAMING_LENGTH + TYPE_NAMING_LENGTH; i < ouputLength + SIDE_NAMING_LENGTH + ROUGHNESS_NAMING_LENGTH + TYPE_NAMING_LENGTH + MAX_FILETYPE_LENGTH; i++)
{
buffer[i] = fileType[i - (ouputLength + SIDE_NAMING_LENGTH + ROUGHNESS_NAMING_LENGTH + TYPE_NAMING_LENGTH)];
}
//
// Setup scan vectors buffer for compute shader.
glGenBuffers(1, &scanVectorsSSBO);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, scanVectorsSSBO);
glBufferData(GL_SHADER_STORAGE_BUFFER, length * length * (3 + 1) * sizeof(GLfloat), 0, GL_DYNAMIC_DRAW);
// see binding = 3 in the shader
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, scanVectorsSSBO);
// Setup m and samples for compute shader.
glUniform1ui(mLocation, exponent);
glUniform1ui(samplesLocation, samples);
// Results are in range [0.0 1.0] and not [0.0, 1.0[.
glUniform1f(binaryFractionFactorLocation, 1.0f / (powf(2.0f, (GLfloat)exponent) - 1.0f));
printf("Generating pre filtered cube maps ...\n");
for (i = 0; i < 6; i++)
{
printf("Side: %d\n", i);
switch (i)
{
case 0:
// Positive X
glusMatrix3x3Identityf(matrix);
buffer[ouputLength + 1] = 'P';
buffer[ouputLength + 2] = 'O';
buffer[ouputLength + 3] = 'S';
buffer[ouputLength + 5] = 'X';
break;
case 1:
// Negative X
glusMatrix3x3Identityf(matrix);
glusMatrix3x3RotateRyf(matrix, 180.0f);
buffer[ouputLength + 1] = 'N';
buffer[ouputLength + 2] = 'E';
buffer[ouputLength + 3] = 'G';
buffer[ouputLength + 5] = 'X';
break;
case 2:
// Positive Y
glusMatrix3x3Identityf(matrix);
glusMatrix3x3RotateRxf(matrix, 90.0f);
glusMatrix3x3RotateRyf(matrix, 90.0f);
buffer[ouputLength + 1] = 'P';
buffer[ouputLength + 2] = 'O';
buffer[ouputLength + 3] = 'S';
buffer[ouputLength + 5] = 'Y';
break;
case 3:
// Negative Y
glusMatrix3x3Identityf(matrix);
glusMatrix3x3RotateRxf(matrix, -90.0f);
glusMatrix3x3RotateRyf(matrix, 90.0f);
buffer[ouputLength + 1] = 'N';
buffer[ouputLength + 2] = 'E';
buffer[ouputLength + 3] = 'G';
buffer[ouputLength + 5] = 'Y';
break;
case 4:
// Positive Z
glusMatrix3x3Identityf(matrix);
glusMatrix3x3RotateRyf(matrix, -90.0f);
buffer[ouputLength + 1] = 'P';
buffer[ouputLength + 2] = 'O';
buffer[ouputLength + 3] = 'S';
buffer[ouputLength + 5] = 'Z';
break;
case 5:
// Negative Z
glusMatrix3x3Identityf(matrix);
glusMatrix3x3RotateRyf(matrix, 90.0f);
buffer[ouputLength + 1] = 'N';
buffer[ouputLength + 2] = 'E';
buffer[ouputLength + 3] = 'G';
buffer[ouputLength + 5] = 'Z';
break;
}
if (!mipMap)
{
// Generate scan vectors
for (k = 0; k < length; k++)
{
for (m = 0; m < length; m++)
{
offsetVector[0] = 0.0f;
offsetVector[1] = offset + step * (GLUSfloat)k;
offsetVector[2] = offset + step * (GLUSfloat)m;
glusVector3AddVector3f(normalVector, startVector, offsetVector);
glusVector3Normalizef(normalVector);
glusMatrix3x3MultiplyVector3f(&scanVectors[k * length * (3 + 1) + m * (3 + 1)], matrix, normalVector);
}
}
// Upload scan vectors for each side.
glBufferSubData(GL_SHADER_STORAGE_BUFFER, 0, length * length * (3 + 1) * sizeof(GLfloat), scanVectors);
}
// For all roughness levels
for (k = 0; k < roughnessSamples; k++)
{
if (mipMap)
{
if (isHDR)
{
hdrOutput[1].width = length;
hdrOutput[1].height = length;
}
else
{
tgaOutput[1].width = length;
tgaOutput[1].height = length;
}
step = 2.0f / (GLUSfloat)length;
offset = step * 0.5f;
// Generate scan vectors
for (m = 0; m < length; m++)
{
for (o = 0; o < length; o++)
{
offsetVector[0] = 0.0f;
offsetVector[1] = offset + step * (GLUSfloat)m;
offsetVector[2] = offset + step * (GLUSfloat)o;
glusVector3AddVector3f(normalVector, startVector, offsetVector);
glusVector3Normalizef(normalVector);
glusMatrix3x3MultiplyVector3f(&scanVectors[m * length * (3 + 1) + o * (3 + 1)], matrix, normalVector);
}
}
// Upload scan vectors for each side.
glBufferSubData(GL_SHADER_STORAGE_BUFFER, 0, length * length * (3 + 1) * sizeof(GLfloat), scanVectors);
}
// Calculate roughness ...
roughness = (GLUSfloat)k * 1.0f / (GLUSfloat)(roughnessSamples - 1);
printf("Roughness: %f\n", roughness);
// ... and set it up for compute shader.
glUniform1f(roughnessLocation, roughness);
if (mipMap)
{
// see binding = 2 in the shader
glBindImageTexture(2, textureCookTorrance[k], 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
}
// Run the compute shader, which is doing the pre-filtering.
glDispatchCompute(length / localSize, length / localSize, 1);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, textureLambert);
if (roughness == 0.0f)
{
// Compute shader stores result in given texture.
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, colorBufferLambert);
}
glActiveTexture(GL_TEXTURE2);
if (mipMap)
{
glBindTexture(GL_TEXTURE_2D, textureCookTorrance[k]);
}
else
{
glBindTexture(GL_TEXTURE_2D, textureCookTorrance[0]);
}
// Compute shader stores result in given texture.
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, colorBufferCookTorrance);
// Resolve
for (p = 0; p < length; p++)
{
for (q = 0; q < length; q++)
{
// Some of the textures need to be stored flipped and mirrored down.
switch (i)
{
case 0:
case 1:
case 4:
case 5:
// Positive X
// Negative X
// Positive Z
// Negative Z
x = length - 1 - q;
y = length - 1 - p;
break;
case 2:
case 3:
// Positive Y
// Negative Y
x = q;
y = p;
break;
}
for (o = 0; o < stride; o++)
{
if (isHDR)
{
if (roughness == 0.0f)
{
hdrOutput[0].data[p * length * stride + q * stride + o] = colorBufferLambert[y * length * 4 + x * 4 + o];
}
hdrOutput[1].data[p * length * stride + q * stride + o] = colorBufferCookTorrance[y * length * 4 + x * 4 + o];
}
else
{
if (roughness == 0.0f)
{
tgaOutput[0].data[p * length * stride + q * stride + o] = (GLUSubyte)glusMathClampf(colorBufferLambert[y * length * 4 + x * 4 + o] * 255.0f, 0.0f, 255.0f);
}
tgaOutput[1].data[p * length * stride + q * stride + o] = (GLUSubyte)glusMathClampf(colorBufferCookTorrance[y * length * 4 + x * 4 + o] * 255.0f, 0.0f, 255.0f);
}
}
}
}
// Construct save name depending on roughness level.
buffer[ouputLength + 7] = '0' + (k / 10);
buffer[ouputLength + 8] = '0' + (k % 10);
if (isHDR)
{
if (roughness == 0.0f)
{
buffer[ouputLength + 10] = 'd';
glusImageSaveHdr(buffer, &hdrOutput[0]);
}
buffer[ouputLength + 10] = 's';
glusImageSaveHdr(buffer, &hdrOutput[1]);
}
else
{
if (roughness == 0.0f)
{
buffer[ouputLength + 10] = 'd';
glusImageSaveTga(buffer, &tgaOutput[0]);
}
buffer[ouputLength + 10] = 's';
glusImageSaveTga(buffer, &tgaOutput[1]);
}
if (mipMap)
{
length /= 2;
}
}
if (mipMap)
{
length = 1 << lengthExponent;
}
}
printf("completed!\n");
//
// Freeing resources
//
free(scanVectors);
free(colorBufferLambert);
free(colorBufferCookTorrance);
glusProgramDestroy(&computeProgram);
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
if (g_cubemap)
{
glDeleteTextures(1, &g_cubemap);
g_cubemap = 0;
}
glBindTexture(GL_TEXTURE_2D, 0);
if (textureLambert)
{
glDeleteTextures(1, &textureLambert);
textureLambert = 0;
}
if (!mipMap)
{
if (textureCookTorrance[0])
{
glDeleteTextures(1, textureCookTorrance);
textureCookTorrance[0] = 0;
}
}
else
{
glDeleteTextures(roughnessSamples, textureCookTorrance);
}
if (isHDR)
{
glusImageDestroyHdr(&hdrOutput[0]);
glusImageDestroyHdr(&hdrOutput[1]);
}
else
{
glusImageDestroyTga(&tgaOutput[0]);
glusImageDestroyTga(&tgaOutput[1]);
}
glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
if (scanVectorsSSBO)
{
glDeleteBuffers(1, &scanVectorsSSBO);
scanVectorsSSBO = 0;
}
//
// Shutdown OpenGL.
//
glusWindowShutdown();
return 0;
}
GLUSboolean init(GLUSvoid)
{
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUStextfile computeSource;
GLUSshape plane;
glusFileLoadText("../Example21/shader/texture.vert.glsl", &vertexSource);
glusFileLoadText("../Example21/shader/texture.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLchar**) &vertexSource.text, 0, 0, 0, (const GLchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
glusFileLoadText("../Example21/shader/texture.comp.glsl", &computeSource);
glusProgramBuildComputeFromSource(&g_computeProgram, (const GLchar**) &computeSource.text);
glusFileDestroyText(&computeSource);
//
// Retrieve the uniform locations in the program.
g_modelViewProjectionMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewProjectionMatrix");
g_textureLocation = glGetUniformLocation(g_program.program, "u_texture");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_texCoordLocation = glGetAttribLocation(g_program.program, "a_texCoord");
g_computeTextureLocation = glGetUniformLocation(g_computeProgram.program, "u_texture");
//
// Generate and bind a texture.
glGenTextures(1, &g_texture);
glBindTexture(GL_TEXTURE_2D, g_texture);
// Create an empty image.
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, g_imageWidth, g_imageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
// Setting the texture parameters.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
//
// Use a helper function to create a rectangular plane.
glusShapeCreateRectangularPlanef(&plane, (GLfloat) g_imageWidth / 2.0f, (GLfloat) g_imageHeight / 2.0f);
// Store the number indices, as we will render with glDrawElements.
g_numberIndicesPlane = plane.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) plane.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_texCoordsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 2 * sizeof(GLfloat), (GLfloat*) plane.texCoords, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// Generate a VBO for the indices.
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, plane.numberIndices * sizeof(GLuint), (GLuint*) plane.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
// Now we can destroy the shape, as all data is now on the GPU.
glusShapeDestroyf(&plane);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glVertexAttribPointer(g_texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_texCoordLocation);
// Also bind the indices to the VAO.
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
// Also bind created texture ...
glBindTexture(GL_TEXTURE_2D, g_texture);
// ... and bind this texture as an image, as we will write to it.
glBindImageTexture(0, g_texture, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA8);
// ... and as this is texture number 0, bind the uniform to the program.
glUniform1i(g_textureLocation, 0);
//
glUseProgram(g_computeProgram.program);
// Pass texture number 0 to the compute shader as well.
glUniform1i(g_computeTextureLocation, 0);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLUSshape cube;
GLUStgaimage image;
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
glusFileLoadText("../Example08_ES/shader/cubemap.vert.glsl", &vertexSource);
glusFileLoadText("../Example08_ES/shader/cubemap.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_modelViewMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_inverseViewMatrixLocation = glGetUniformLocation(g_program.program, "u_inverseViewMatrix");
g_cubemapTextureLocation = glGetUniformLocation(g_program.program, "u_cubemapTexture");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
// Here we create the cube map.
glGenTextures(1, &g_cubemapTexture);
glBindTexture(GL_TEXTURE_CUBE_MAP, g_cubemapTexture);
glusImageLoadTga("cm_pos_x.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("cm_neg_x.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("cm_pos_y.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("cm_neg_y.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("cm_pos_z.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glusImageLoadTga("cm_neg_z.tga", &image);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glusImageDestroyTga(&image);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
//
glusShapeCreateCubef(&cube, 0.5f);
g_numberIndicesSphere = cube.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, cube.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) cube.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, cube.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) cube.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, cube.numberIndices * sizeof(GLuint), (GLuint*) cube.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&cube);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
// Activate and set the cube map.
glUniform1i(g_cubemapTextureLocation, 0);
glBindTexture(GL_TEXTURE_CUBE_MAP, g_cubemapTexture);
//
// As the camera does not move, we can create the view matrix here.
glusMatrix4x4LookAtf(g_viewMatrix, 0.0f, 0.0f, 5.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepthf(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLUSshape wavefrontObj;
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLfloat viewMatrix[16];
GLfloat lightDirection[3];
lightDirection[0] = g_lightPosition[0];
lightDirection[1] = g_lightPosition[1];
lightDirection[2] = g_lightPosition[2];
glusVector3Normalizef(lightDirection);
//
glusFileLoadText("../Example34/shader/renderdepthmap.vert.glsl", &vertexSource);
glusFileLoadText("../Example34/shader/renderdepthmap.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_programDepthPass, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
glusFileLoadText("../Example34/shader/subsurfacescattering.vert.glsl", &vertexSource);
glusFileLoadText("../Example34/shader/subsurfacescattering.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixDepthPassLocation = glGetUniformLocation(g_programDepthPass.program, "u_projectionMatrix");
g_modelViewMatrixDepthPassLocation = glGetUniformLocation(g_programDepthPass.program, "u_modelViewMatrix");
g_vertexDepthPassLocation = glGetAttribLocation(g_programDepthPass.program, "a_vertex");
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_viewMatrixLocation = glGetUniformLocation(g_program.program, "u_viewMatrix");
g_modelMatrixLocation = glGetUniformLocation(g_program.program, "u_modelMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_depthPassMatrixLocation = glGetUniformLocation(g_program.program, "u_depthPassMatrix");
g_diffuseColorLocation = glGetUniformLocation(g_program.program, "u_diffuseColor");
g_scatterColorLocation = glGetUniformLocation(g_program.program, "u_scatterColor");
g_lightDirectionLocation = glGetUniformLocation(g_program.program, "u_lightDirection");
g_depthPassTextureLocation = glGetUniformLocation(g_program.program, "u_depthPassTexture");
g_nearFarLocation = glGetUniformLocation(g_program.program, "u_nearFar");
g_wrapLocation = glGetUniformLocation(g_program.program, "u_wrap");
g_scatterWidthLocation = glGetUniformLocation(g_program.program, "u_scatterWidth");
g_scatterFalloffLocation = glGetUniformLocation(g_program.program, "u_scatterFalloff");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
glGenTextures(1, &g_depthPassTexture);
glBindTexture(GL_TEXTURE_2D, g_depthPassTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, g_depthPassTextureSize, g_depthPassTextureSize, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, 0);
//
glGenFramebuffers(1, &g_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, g_fbo);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, g_depthPassTexture, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
printf("GL_FRAMEBUFFER_COMPLETE error 0x%x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
return GLUS_FALSE;
}
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
//
// Use a helper function to load an wavefront object file.
glusShapeLoadWavefront("dragon.obj", &wavefrontObj);
g_numberVertices = wavefrontObj.numberVertices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, wavefrontObj.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) wavefrontObj.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, wavefrontObj.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) wavefrontObj.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glusShapeDestroyf(&wavefrontObj);
//
glUseProgram(g_program.program);
glusMatrix4x4LookAtf(viewMatrix, g_cameraPosition[0], g_cameraPosition[1], g_cameraPosition[2], 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
glusMatrix4x4MultiplyVector3f(lightDirection, viewMatrix, lightDirection);
glUniform3fv(g_lightDirectionLocation, 1, lightDirection);
glUniform1i(g_depthPassTextureLocation, 0);
// Dragon
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
//
glUseProgram(g_programDepthPass.program);
// Dragon
glGenVertexArrays(1, &g_vaoDepthPass);
glBindVertexArray(g_vaoDepthPass);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexDepthPassLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexDepthPassLocation);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLfloat lightDirection[3] = { 1.0f, 1.0f, 1.0f };
GLfloat color[4] = { 0.0f, 1.0f, 1.0f, 1.0f };
GLUStextfile computeSource;
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLint i;
GLfloat matrix[16];
GLfloat* normals;
GLfloat distanceRest;
GLfloat distanceDiagonalRest;
GLfloat sphereCenter[4] = {0.0f, 0.0f, -0.01f, 1.0f};
GLfloat sphereRadius = 1.0f;
glusFileLoadText("../Example40/shader/cloth.comp.glsl", &computeSource);
glusProgramBuildComputeFromSource(&g_computeProgram, (const GLchar**) &computeSource.text);
glusFileDestroyText(&computeSource);
glusFileLoadText("../Example40/shader/cloth.vert.glsl", &vertexSource);
glusFileLoadText("../Example40/shader/cloth.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_verticesPerRowLocation = glGetUniformLocation(g_computeProgram.program, "u_verticesPerRow");
g_deltaTimeLocation = glGetUniformLocation(g_computeProgram.program, "u_deltaTime");
g_distanceRestLocation = glGetUniformLocation(g_computeProgram.program, "u_distanceRest");
g_distanceDiagonalRestLocation = glGetUniformLocation(g_computeProgram.program, "u_distanceDiagonalRest");
g_sphereCenterLocation = glGetUniformLocation(g_computeProgram.program, "u_sphereCenter");
g_sphereRadiusLocation = glGetUniformLocation(g_computeProgram.program, "u_sphereRadius");
g_modelViewProjectionMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewProjectionMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_lightDirectionLocation = glGetUniformLocation(g_program.program, "u_lightDirection");
g_colorLocation = glGetUniformLocation(g_program.program, "u_color");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
// Use a helper function to create a grid plane.
glusShapeCreateRectangularGridPlanef(&g_gridPlane, 2.0f, 2.0f, ROWS, ROWS, GLUS_FALSE);
// Use x, as only horizontal and vertical springs are used. Adapt this, if diagonal or a non square grid is used.
distanceRest = g_gridPlane.vertices[4] - g_gridPlane.vertices[0];
distanceDiagonalRest = sqrtf(2.0f * distanceRest * distanceRest);
// Rotate by 90 degrees, that the grid is in the x-z-plane.
glusMatrix4x4Identityf(matrix);
glusMatrix4x4Translatef(matrix, 0.0f, 1.1f, 0.0f);
glusMatrix4x4RotateRxf(matrix, -90.0f);
for (i = 0; i < g_gridPlane.numberVertices; i++)
{
glusMatrix4x4MultiplyPoint4f(&g_gridPlane.vertices[4 * i], matrix, &g_gridPlane.vertices[4 * i]);
}
g_numberIndicesPlane = g_gridPlane.numberIndices;
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, g_gridPlane.numberIndices * sizeof(GLuint), (GLuint*) g_gridPlane.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
//
normals = (GLfloat*)malloc(g_gridPlane.numberVertices * 4 * sizeof(GLfloat));
// Add one more GLfloat channel as padding for std430 layout.
glusPaddingConvertf(normals, g_gridPlane.normals, 3, 1, g_gridPlane.numberVertices);
free(g_gridPlane.normals);
g_gridPlane.normals = normals;
//
glGenBuffers(3, g_verticesBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, g_verticesBuffer[0]);
glBufferData(GL_SHADER_STORAGE_BUFFER, g_gridPlane.numberVertices * 4 * sizeof(GLfloat), g_gridPlane.vertices, GL_DYNAMIC_DRAW);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, g_verticesBuffer[1]);
glBufferData(GL_SHADER_STORAGE_BUFFER, g_gridPlane.numberVertices * 4 * sizeof(GLfloat), g_gridPlane.vertices, GL_DYNAMIC_DRAW);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, g_verticesBuffer[2]);
glBufferData(GL_SHADER_STORAGE_BUFFER, g_gridPlane.numberVertices * 4 * sizeof(GLfloat), 0, GL_DYNAMIC_DRAW);
glGenBuffers(1, &g_normalsBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, g_normalsBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, g_gridPlane.numberVertices * 4 * sizeof(GLfloat), g_gridPlane.normals, GL_DYNAMIC_DRAW);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsBuffer);
glVertexAttribPointer(g_normalLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesBuffer[2]);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBindVertexArray(0);
//
glusVector3Normalizef(lightDirection);
glUniform3fv(g_lightDirectionLocation, 1, lightDirection);
glUniform4fv(g_colorLocation, 1, color);
glUseProgram(0);
//
glUseProgram(g_computeProgram.program);
glUniform1i(g_verticesPerRowLocation, ROWS + 1);
glUniform1f(g_distanceRestLocation, distanceRest);
glUniform1f(g_distanceDiagonalRestLocation, distanceDiagonalRest);
glUniform4fv(g_sphereCenterLocation, 1, sphereCenter);
glUniform1f(g_sphereRadiusLocation, sphereRadius);
glUseProgram(0);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
//
if (!initSphere(sphereCenter, sphereRadius, lightDirection))
{
return GLUS_FALSE;
}
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLfloat viewMatrix[16];
GLUSshape plane;
GLUStextfile vertexSource;
GLUStextfile controlSource;
GLUStextfile evaluationSource;
GLUStextfile geometrySource;
GLUStextfile fragmentSource;
GLUStgaimage image;
glusFileLoadText("../Example23/shader/tessellation.vert.glsl", &vertexSource);
glusFileLoadText("../Example23/shader/tessellation.cont.glsl", &controlSource);
glusFileLoadText("../Example23/shader/tessellation.eval.glsl", &evaluationSource);
glusFileLoadText("../Example23/shader/tessellation.geom.glsl", &geometrySource);
glusFileLoadText("../Example23/shader/tessellation.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, (const GLUSchar**) &controlSource.text, (const GLUSchar**) &evaluationSource.text, (const GLUSchar**) &geometrySource.text, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&controlSource);
glusFileDestroyText(&evaluationSource);
glusFileDestroyText(&geometrySource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_viewMatrixLocation = glGetUniformLocation(g_program.program, "u_viewMatrix");
g_modelMatrixLocation = glGetUniformLocation(g_program.program, "u_modelMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_colorTextureLocation = glGetUniformLocation(g_program.program, "u_colorTexture");
g_normalTextureLocation = glGetUniformLocation(g_program.program, "u_normalTexture");
g_displacementScaleLocation = glGetUniformLocation(g_program.program, "u_displacementScale");
g_screenDistanceLocation = glGetUniformLocation(g_program.program, "u_screenDistance");
g_doTessellateLocation = glGetUniformLocation(g_program.program, "u_doTessellate");
g_widthLocation = glGetUniformLocation(g_program.program, "u_width");
g_heightLocation = glGetUniformLocation(g_program.program, "u_height");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_tangentLocation = glGetAttribLocation(g_program.program, "a_tangent");
g_bitangentLocation = glGetAttribLocation(g_program.program, "a_bitangent");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
g_texCoordLocation = glGetAttribLocation(g_program.program, "a_texCoord");
//
// Load the image.
glusImageLoadTga("four_shapes_color.tga", &image);
glActiveTexture(GL_TEXTURE0);
// Generate and bind a texture.
glGenTextures(1, &g_colorTexture);
glBindTexture(GL_TEXTURE_2D, g_colorTexture);
// Transfer the image data from the CPU to the GPU.
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
// Setting the texture parameters.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glusImageDestroyTga(&image);
//
// Load the image.
glusImageLoadTga("four_shapes_normal.tga", &image);
glActiveTexture(GL_TEXTURE1);
// Generate and bind a texture.
glGenTextures(1, &g_normalTexture);
glBindTexture(GL_TEXTURE_2D, g_normalTexture);
// Transfer the image data from the CPU to the GPU.
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
// Setting the texture parameters.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glusImageDestroyTga(&image);
//
glActiveTexture(GL_TEXTURE0);
//
// Core grid
glusShapeCreateRectangularGridPlanef(&plane, 3.0f, 3.0f, 16, 16, GLUS_FALSE);
g_numberIndicesPlane = plane.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) plane.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_tangentsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_tangentsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) plane.tangents, GL_STATIC_DRAW);
glGenBuffers(1, &g_bitangentsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_bitangentsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) plane.bitangents, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) plane.normals, GL_STATIC_DRAW);
glGenBuffers(1, &g_texCoordsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glBufferData(GL_ARRAY_BUFFER, plane.numberVertices * 2 * sizeof(GLfloat), (GLfloat*) plane.texCoords, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, g_numberIndicesPlane * sizeof(GLuint), (GLuint*) plane.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&plane);
//
glUseProgram(g_program.program);
// Calculate the view matrix ...
glusMatrix4x4LookAtf(viewMatrix, 0.0f, 4.0f, 4.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
glUniformMatrix4fv(g_viewMatrixLocation, 1, GL_FALSE, viewMatrix);
// Global variable to scale the displacement
glUniform1f(g_displacementScaleLocation, g_displacementScale);
// Tessellate smaller than the given distance
glUniform1f(g_screenDistanceLocation, 8.0f);
// Enable tesselllation
glUniform1i(g_doTessellateLocation, 1);
//
glUniform1i(g_colorTextureLocation, 0);
glUniform1i(g_normalTextureLocation, 1);
//
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_tangentsVBO);
glVertexAttribPointer(g_tangentLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_tangentLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_bitangentsVBO);
glVertexAttribPointer(g_bitangentLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_bitangentLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glVertexAttribPointer(g_texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_texCoordLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
// We process triangle patches
glPatchParameteri(GL_PATCH_VERTICES, 3);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
// This is a white light.
struct LightProperties light = { { 1.0f, 1.0f, 1.0f }, { 0.3f, 0.3f, 0.3f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f } };
GLUStextfile vertexSource;
GLUStextfile geometrySource;
GLUStextfile fragmentSource;
GLUStgaimage image;
GLUSshape bunnyShape;
//
glusFileLoadText("../Example26/shader/ambient_diffuse_texture.vert.glsl", &vertexSource);
glusFileLoadText("../Example26/shader/ambient_diffuse_texture.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
glusFileLoadText("../Example26/shader/fur.vert.glsl", &vertexSource);
glusFileLoadText("../Example26/shader/fur.geom.glsl", &geometrySource);
glusFileLoadText("../Example26/shader/fur.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_programFur, (const GLUSchar**) &vertexSource.text, 0, 0, (const GLUSchar**) &geometrySource.text, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&geometrySource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_modelViewMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_light.directionLocation = glGetUniformLocation(g_program.program, "u_light.direction");
g_light.ambientColorLocation = glGetUniformLocation(g_program.program, "u_light.ambientColor");
g_light.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_light.diffuseColor");
g_light.specularColorLocation = glGetUniformLocation(g_program.program, "u_light.specularColor");
g_textureLocation = glGetUniformLocation(g_program.program, "u_textureFurColor");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
g_texCoordLocation = glGetAttribLocation(g_program.program, "a_texCoord");
g_projectionMatrixFurLocation = glGetUniformLocation(g_programFur.program, "u_projectionMatrix");
g_modelViewMatrixFurLocation = glGetUniformLocation(g_programFur.program, "u_modelViewMatrix");
g_normalMatrixFurLocation = glGetUniformLocation(g_programFur.program, "u_normalMatrix");
g_lightDirectionFurLocation = glGetUniformLocation(g_programFur.program, "u_lightDirection");
g_textureFurColorLocation = glGetUniformLocation(g_programFur.program, "u_textureFurColor");
g_textureFurStrengthLocation = glGetUniformLocation(g_programFur.program, "u_textureFurStrength");
g_vertexFurLocation = glGetAttribLocation(g_programFur.program, "a_vertex");
g_normalFurLocation = glGetAttribLocation(g_programFur.program, "a_normal");
g_texCoordFurLocation = glGetAttribLocation(g_programFur.program, "a_texCoord");
//
// Color texture set up.
glusImageLoadTga("tiger.tga", &image);
glGenTextures(1, &g_textureFurColor);
glBindTexture(GL_TEXTURE_2D, g_textureFurColor);
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
// Mipmap generation is now included in OpenGL 3 and above
glGenerateMipmap(GL_TEXTURE_2D);
// Trilinear filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
glusImageDestroyTga(&image);
// A simple noise texture influences the strength of each fur pixel.
glusPerlinCreateNoise2D(&image, 64, 64, 0, 100.0f, 255.0f, 0.5f, 1);
glGenTextures(1, &g_textureFurStrength);
glBindTexture(GL_TEXTURE_2D, g_textureFurStrength);
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
// Mipmap generation is now included in OpenGL 3 and above
glGenerateMipmap(GL_TEXTURE_2D);
// Trilinear filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, 0);
glusImageDestroyTga(&image);
//
// Use a helper function to load an wavefront object file.
glusShapeLoadWavefront("bunny.obj", &bunnyShape);
// This model does not have any texture coordinates, so generate them.
glusShapeTexGenByAxesf(&bunnyShape, 2.0f, 0.0f, 2.0f, 0.0f, 0.0f, 0.0f);
g_numberVertices = bunnyShape.numberVertices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, bunnyShape.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) bunnyShape.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, bunnyShape.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) bunnyShape.normals, GL_STATIC_DRAW);
glGenBuffers(1, &g_texCoordsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glBufferData(GL_ARRAY_BUFFER, bunnyShape.numberVertices * 2 * sizeof(GLfloat), (GLfloat*) bunnyShape.texCoords, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glusShapeDestroyf(&bunnyShape);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glVertexAttribPointer(g_texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_texCoordLocation);
glUseProgram(g_programFur.program);
glGenVertexArrays(1, &g_vaoFur);
glBindVertexArray(g_vaoFur);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_texCoordsVBO);
glVertexAttribPointer(g_texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_texCoordLocation);
//
glusMatrix4x4LookAtf(g_viewMatrix, 0.0f, 0.75f, 3.0f, 0.0f, 0.75f, 0.0f, 0.0f, 1.0f, 0.0f);
//
glusVector3Normalizef(light.direction);
// Transform light to camera space, as it is currently in world space.
glusMatrix4x4MultiplyVector3f(light.direction, g_viewMatrix, light.direction);
glUseProgram(g_program.program);
// Set up light ...
glUniform3fv(g_light.directionLocation, 1, light.direction);
glUniform4fv(g_light.ambientColorLocation, 1, light.ambientColor);
glUniform4fv(g_light.diffuseColorLocation, 1, light.diffuseColor);
glUniform4fv(g_light.specularColorLocation, 1, light.specularColor);
// ... and the texture.
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, g_textureFurColor);
glUniform1i(g_textureLocation, 0);
glUseProgram(g_programFur.program);
glUniform3fv(g_lightDirectionFurLocation, 1, light.direction);
// Fur color and position textures.
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, g_textureFurColor);
glUniform1i(g_textureFurColorLocation, 0);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, g_textureFurStrength);
glUniform1i(g_textureFurStrengthLocation, 1);
//
glClearColor(0.8f, 0.8f, 0.8f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
// This is a white light.
struct LightProperties light = { { 1.0f, 1.0f, 1.0f }, { 0.3f, 0.3f, 0.3f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f } };
// Silver color material with white specular color.
struct MaterialProperties material = { { 0.75f, 0.75f, 0.75f, 1.0f }, { 0.75f, 0.75f, 0.75f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, 20.0f };
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSshape sphere;
GLUStgaimage image;
glusFileLoadText("../Example24/shader/erode.vert.glsl", &vertexSource);
glusFileLoadText("../Example24/shader/erode.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
// Create perlin noise. The brightness of the texels represents the time to erode.
// The brighter the texel, the earlier the pixel erodes.
glusPerlinCreateNoise3D(&image, 64, 64, 64, 0, 8.0f, 192.0f, 0.5f, 4);
// Generate and bind a texture.
glGenTextures(1, &g_texture);
glBindTexture(GL_TEXTURE_3D, g_texture);
// Transfer the image data from the CPU to the GPU.
glTexImage3D(GL_TEXTURE_3D, 0, image.format, image.width, image.height, image.depth, 0, image.format, GL_UNSIGNED_BYTE, image.data);
// Setting the texture parameters.
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glusImageDestroyTga(&image);
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_modelViewMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_light.directionLocation = glGetUniformLocation(g_program.program, "u_light.direction");
g_light.ambientColorLocation = glGetUniformLocation(g_program.program, "u_light.ambientColor");
g_light.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_light.diffuseColor");
g_light.specularColorLocation = glGetUniformLocation(g_program.program, "u_light.specularColor");
g_material.ambientColorLocation = glGetUniformLocation(g_program.program, "u_material.ambientColor");
g_material.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_material.diffuseColor");
g_material.specularColorLocation = glGetUniformLocation(g_program.program, "u_material.specularColor");
g_material.specularExponentLocation = glGetUniformLocation(g_program.program, "u_material.specularExponent");
g_textureLocation = glGetUniformLocation(g_program.program, "u_texture");
g_erodeLocation = glGetUniformLocation(g_program.program, "u_erode");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
// Use a helper function to create a sphere.
glusShapeCreateSpheref(&sphere, 1.0f, 64);
g_numberIndicesSphere = sphere.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, sphere.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) sphere.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, sphere.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) sphere.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sphere.numberIndices * sizeof(GLuint), (GLuint*) sphere.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&sphere);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
//
glusVector3Normalizef(light.direction);
glusMatrix4x4LookAtf(g_viewMatrix, 0.0f, 0.0f, 5.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
// Transform light to camera space, as it is currently in world space.
glusMatrix4x4MultiplyVector3f(light.direction, g_viewMatrix, light.direction);
// Set up light ...
glUniform3fv(g_light.directionLocation, 1, light.direction);
glUniform4fv(g_light.ambientColorLocation, 1, light.ambientColor);
glUniform4fv(g_light.diffuseColorLocation, 1, light.diffuseColor);
glUniform4fv(g_light.specularColorLocation, 1, light.specularColor);
// ... and material values.
glUniform4fv(g_material.ambientColorLocation, 1, material.ambientColor);
glUniform4fv(g_material.diffuseColorLocation, 1, material.diffuseColor);
glUniform4fv(g_material.specularColorLocation, 1, material.specularColor);
glUniform1f(g_material.specularExponentLocation, material.specularExponent);
//
glUniform1i(g_textureLocation, 0);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
// No back face culling by purpose. This allows to look through the eroded sphere.
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLUSshape background;
GLUSshape torus;
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLfloat viewMatrix[16];
GLfloat lightDirection[3];
GLenum none[] = {GL_NONE};
lightDirection[0] = g_lightPosition[0];
lightDirection[1] = g_lightPosition[1];
lightDirection[2] = g_lightPosition[2];
glusVector3Normalizef(lightDirection);
//
glusFileLoadText("../Example12_ES/shader/rendershadow.vert.glsl", &vertexSource);
glusFileLoadText("../Example12_ES/shader/rendershadow.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_programShadow, (const GLUSchar**) &vertexSource.text, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
glusFileLoadText("../Example12_ES/shader/useshadow.vert.glsl", &vertexSource);
glusFileLoadText("../Example12_ES/shader/useshadow.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixShadowLocation = glGetUniformLocation(g_programShadow.program, "u_projectionMatrix");
g_modelViewMatrixShadowLocation = glGetUniformLocation(g_programShadow.program, "u_modelViewMatrix");
g_vertexShadowLocation = glGetAttribLocation(g_programShadow.program, "a_vertex");
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_viewMatrixLocation = glGetUniformLocation(g_program.program, "u_viewMatrix");
g_modelMatrixLocation = glGetUniformLocation(g_program.program, "u_modelMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_shadowMatrixLocation = glGetUniformLocation(g_program.program, "u_shadowMatrix");
g_shadowTextureLocation = glGetUniformLocation(g_program.program, "u_shadowTexture");
g_colorLocation = glGetUniformLocation(g_program.program, "u_shapeColor");
g_lightDirectionLocation = glGetUniformLocation(g_program.program, "u_lightDirection");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
glGenTextures(1, &g_shadowTexture);
glBindTexture(GL_TEXTURE_2D, g_shadowTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, g_shadowTextureSize, g_shadowTextureSize, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LESS);
glBindTexture(GL_TEXTURE_2D, 0);
//
glGenFramebuffers(1, &g_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, g_fbo);
glDrawBuffers(1, none);
glReadBuffer(GL_NONE);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, g_shadowTexture, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
printf("GL_FRAMEBUFFER_COMPLETE error 0x%x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
return GLUS_FALSE;
}
glClearDepthf(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
//
glusShapeCreateTorusf(&torus, 0.5f, 1.0f, 32, 32);
g_numberIndicesSphere = torus.numberIndices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, torus.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) torus.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, torus.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) torus.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, torus.numberIndices * sizeof(GLuint), (GLuint*) torus.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&torus);
//
glusShapeCreatePlanef(&background, 10.0f);
g_numberIndicesBackground = background.numberIndices;
glGenBuffers(1, &g_verticesBackgroundVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesBackgroundVBO);
glBufferData(GL_ARRAY_BUFFER, background.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) background.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsBackgroundVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsBackgroundVBO);
glBufferData(GL_ARRAY_BUFFER, background.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) background.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesBackgroundVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesBackgroundVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, background.numberIndices * sizeof(GLuint), (GLuint*) background.indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glusShapeDestroyf(&background);
//
glUseProgram(g_program.program);
glusMatrix4x4LookAtf(viewMatrix, g_cameraPosition[0], g_cameraPosition[1], g_cameraPosition[2], 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
glusMatrix4x4MultiplyVector3f(lightDirection, viewMatrix, lightDirection);
glUniform3fv(g_lightDirectionLocation, 1, lightDirection);
glUniform1i(g_shadowTextureLocation, 0);
// Torus
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
// Plane
glGenVertexArrays(1, &g_vaoBackground);
glBindVertexArray(g_vaoBackground);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesBackgroundVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsBackgroundVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesBackgroundVBO);
//
glUseProgram(g_programShadow.program);
// Torus
glGenVertexArrays(1, &g_vaoShadow);
glBindVertexArray(g_vaoShadow);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexShadowLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexShadowLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesVBO);
// Plane
glGenVertexArrays(1, &g_vaoShadowBackground);
glBindVertexArray(g_vaoShadowBackground);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesBackgroundVBO);
glVertexAttribPointer(g_vertexShadowLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexShadowLocation);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesBackgroundVBO);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepthf(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
// Needed when rendering the shadow map. This will avoid artifacts.
glPolygonOffset(1.0f, 0.0f);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
// This is a white light.
struct LightProperties light = { { 1.0f, 1.0f, 1.0f }, { 0.3f, 0.3f, 0.3f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f } };
// Green color material with white specular color, half transparent.
struct MaterialProperties material = { { 0.0f, 1.0f, 0.0f, 1.0f }, { 0.0f, 1.0f, 0.0f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, 20.0f, 0.5f };
// Buffer for cleaning the head index testure.
static GLuint clearBuffer[SCREEN_WIDTH * SCREEN_HEIGHT];
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSshape wavefrontObj;
GLuint i;
for (i = 0; i < SCREEN_WIDTH * SCREEN_HEIGHT; i++)
{
// 0xffffffff means end of list, so for the start tehre is no entry.
clearBuffer[i] = 0xffffffff;
}
//
glusFileLoadText("../Example36/shader/phong_linked_list.vert.glsl", &vertexSource);
glusFileLoadText("../Example36/shader/phong_linked_list.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_modelViewMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_light.directionLocation = glGetUniformLocation(g_program.program, "u_light.direction");
g_light.ambientColorLocation = glGetUniformLocation(g_program.program, "u_light.ambientColor");
g_light.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_light.diffuseColor");
g_light.specularColorLocation = glGetUniformLocation(g_program.program, "u_light.specularColor");
g_material.ambientColorLocation = glGetUniformLocation(g_program.program, "u_material.ambientColor");
g_material.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_material.diffuseColor");
g_material.specularColorLocation = glGetUniformLocation(g_program.program, "u_material.specularColor");
g_material.specularExponentLocation = glGetUniformLocation(g_program.program, "u_material.specularExponent");
g_material.alphaLocation = glGetUniformLocation(g_program.program, "u_material.alpha");
g_maxNodesLocation = glGetUniformLocation(g_program.program, "u_maxNodes");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
glusFileLoadText("../Example36/shader/fullscreen_blend.vert.glsl", &vertexSource);
glusFileLoadText("../Example36/shader/fullscreen_blend.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_blendFullscreenProgram, (const GLchar**)&vertexSource.text, 0, 0, 0, (const GLchar**)&fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
// Atomic counter to gather a free node slot concurrently.
glGenBuffers(1, &g_freeNodeIndex);
glBindBufferBase(GL_ATOMIC_COUNTER_BUFFER, BINDING_ATOMIC_FREE_INDEX, g_freeNodeIndex);
glBufferData(GL_ATOMIC_COUNTER_BUFFER, sizeof(GLuint), 0, GL_DYNAMIC_DRAW);
// Head index texture/image, which contains the
glGenTextures(1, &g_headIndexTexture);
glBindTexture(GL_TEXTURE_2D, g_headIndexTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_R32UI, SCREEN_WIDTH, SCREEN_HEIGHT, 0, GL_RED_INTEGER, GL_UNSIGNED_INT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, 0);
glBindImageTexture(BINDING_IMAGE_HEAD_INDEX, g_headIndexTexture, 0, GL_FALSE, 0, GL_READ_WRITE, GL_R32UI);
// Buffer to clear/reset the head pointers.
glGenBuffers(1, &g_clearBuffer);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, g_clearBuffer);
glBufferData(GL_PIXEL_UNPACK_BUFFER, SCREEN_WIDTH * SCREEN_HEIGHT * sizeof(GLuint), clearBuffer, GL_STATIC_COPY);
// Buffer for the linked list.
glGenBuffers(1, &g_linkedListBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, BINDING_BUFFER_LINKED_LIST, g_linkedListBuffer);
// Size is RGBA, depth (5 * GLfloat), next pointer (1 * GLuint) and 2 paddings (2 * GLfloat).
glBufferData(GL_SHADER_STORAGE_BUFFER, MAX_NODES * (sizeof(GLfloat) * 5 + sizeof(GLuint) * 1) + sizeof(GLfloat) * 2, 0, GL_DYNAMIC_DRAW);
//
// Use a helper function to load an wavefront object file.
glusShapeLoadWavefront("dragon.obj", &wavefrontObj);
g_numberVertices = wavefrontObj.numberVertices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, wavefrontObj.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) wavefrontObj.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, wavefrontObj.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) wavefrontObj.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glusShapeDestroyf(&wavefrontObj);
//
glUseProgram(g_blendFullscreenProgram.program);
glGenVertexArrays(1, &g_blendFullscreenVAO);
glBindVertexArray(g_blendFullscreenVAO);
glBindVertexArray(0);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
glBindVertexArray(0);
//
glusMatrix4x4LookAtf(g_viewMatrix, 0.0f, 0.0f, 3.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
//
glusVector3Normalizef(light.direction);
// Transform light to camera space, as it is currently in world space.
glusMatrix4x4MultiplyVector3f(light.direction, g_viewMatrix, light.direction);
// Set up light ...
glUniform3fv(g_light.directionLocation, 1, light.direction);
glUniform4fv(g_light.ambientColorLocation, 1, light.ambientColor);
glUniform4fv(g_light.diffuseColorLocation, 1, light.diffuseColor);
glUniform4fv(g_light.specularColorLocation, 1, light.specularColor);
// ... and material values.
glUniform4fv(g_material.ambientColorLocation, 1, material.ambientColor);
glUniform4fv(g_material.diffuseColorLocation, 1, material.diffuseColor);
glUniform4fv(g_material.specularColorLocation, 1, material.specularColor);
glUniform1f(g_material.specularExponentLocation, material.specularExponent);
glUniform1f(g_material.alphaLocation, material.alpha);
glUniform1ui(g_maxNodesLocation, MAX_NODES);
//
glDisable(GL_DEPTH_TEST);
return GLUS_TRUE;
}
GLUSboolean initWavefront(GLUSfloat viewMatrix[16], struct LightProperties* light)
{
// Color material with white specular color.
struct MaterialProperties material = { { 0.0f, 1.0f, 1.0f, 1.0f }, { 0.0f, 1.0f, 1.0f, 1.0f }, { 1.0f, 1.0f, 1.0f, 1.0f }, 20.0f };
GLUStextfile vertexSource;
GLUStextfile fragmentSource;
GLUSshape wavefrontObj;
g_viewMatrix = viewMatrix;
g_light = light;
//
glusFileLoadText("shader/phong.vert.glsl", &vertexSource);
glusFileLoadText("shader/phong.frag.glsl", &fragmentSource);
glusProgramBuildFromSource(&g_program, (const GLUSchar**) &vertexSource.text, 0, 0, 0, (const GLUSchar**) &fragmentSource.text);
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&fragmentSource);
//
g_projectionMatrixLocation = glGetUniformLocation(g_program.program, "u_projectionMatrix");
g_modelViewMatrixLocation = glGetUniformLocation(g_program.program, "u_modelViewMatrix");
g_normalMatrixLocation = glGetUniformLocation(g_program.program, "u_normalMatrix");
g_lightLocations.directionLocation = glGetUniformLocation(g_program.program, "u_light.direction");
g_lightLocations.ambientColorLocation = glGetUniformLocation(g_program.program, "u_light.ambientColor");
g_lightLocations.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_light.diffuseColor");
g_lightLocations.specularColorLocation = glGetUniformLocation(g_program.program, "u_light.specularColor");
g_material.ambientColorLocation = glGetUniformLocation(g_program.program, "u_material.ambientColor");
g_material.diffuseColorLocation = glGetUniformLocation(g_program.program, "u_material.diffuseColor");
g_material.specularColorLocation = glGetUniformLocation(g_program.program, "u_material.specularColor");
g_material.specularExponentLocation = glGetUniformLocation(g_program.program, "u_material.specularExponent");
g_vertexLocation = glGetAttribLocation(g_program.program, "a_vertex");
g_normalLocation = glGetAttribLocation(g_program.program, "a_normal");
//
// Use a helper function to load an wavefront object file.
glusShapeLoadWavefront("teapot.obj", &wavefrontObj);
g_numberVertices = wavefrontObj.numberVertices;
glGenBuffers(1, &g_verticesVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glBufferData(GL_ARRAY_BUFFER, wavefrontObj.numberVertices * 4 * sizeof(GLfloat), (GLfloat*) wavefrontObj.vertices, GL_STATIC_DRAW);
glGenBuffers(1, &g_normalsVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glBufferData(GL_ARRAY_BUFFER, wavefrontObj.numberVertices * 3 * sizeof(GLfloat), (GLfloat*) wavefrontObj.normals, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glusShapeDestroyf(&wavefrontObj);
//
glUseProgram(g_program.program);
glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesVBO);
glVertexAttribPointer(g_vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_vertexLocation);
glBindBuffer(GL_ARRAY_BUFFER, g_normalsVBO);
glVertexAttribPointer(g_normalLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(g_normalLocation);
//
glusVector3Normalizef(g_light->direction);
// Set up light ...
// Direction is set later
glUniform4fv(g_lightLocations.ambientColorLocation, 1, g_light->ambientColor);
glUniform4fv(g_lightLocations.diffuseColorLocation, 1, g_light->diffuseColor);
glUniform4fv(g_lightLocations.specularColorLocation, 1, g_light->specularColor);
// ... and material values.
glUniform4fv(g_material.ambientColorLocation, 1, material.ambientColor);
glUniform4fv(g_material.diffuseColorLocation, 1, material.diffuseColor);
glUniform4fv(g_material.specularColorLocation, 1, material.specularColor);
glUniform1f(g_material.specularExponentLocation, material.specularExponent);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
return GLUS_TRUE;
}
GLUSboolean init(GLUSvoid)
{
GLfloat textureToWorldNormalMatrix[16];
// The maximum detail level which is 2^s = sMapExtend.
GLuint sMaxDetailLevel;
// The maximum detail level which is 2^t = tMapExtend.
GLuint tMaxDetailLevel;
// The overall maximum detail level from s and t.
GLuint overallMaxDetailLevel;
// Step for s and t direction.
GLfloat detailStep;
GLuint s, t;
GLUStgaimage image;
GLfloat* map = 0;
GLuint* indices = 0;
GLUStextfile vertexSource;
GLUStextfile controlSource;
GLUStextfile evaluationSource;
GLUStextfile geometrySource;
GLUStextfile fragmentSource;
GLfloat lightDirection[3] = { 1.0f, 1.0f, 1.0f };
glusVector3Normalizef(lightDirection);
g_topView.cameraPosition[0] = 0.0f;
g_topView.cameraPosition[1] = 30000.0f * METERS_TO_VIRTUAL_WORLD_SCALE;
g_topView.cameraPosition[2] = 0.0f;
g_topView.cameraPosition[3] = 1.0;
g_topView.cameraDirection[0] = 0.0f;
g_topView.cameraDirection[1] = -1.0f;
g_topView.cameraDirection[2] = 0.0f;
g_topView.cameraUp[0] = 0.0f;
g_topView.cameraUp[1] = 0.0f;
g_topView.cameraUp[2] = -1.0f;
g_topView.fov = 40.0f;
g_personView.cameraPosition[0] = 0.0f;
g_personView.cameraPosition[1] = 4700.0f * METERS_TO_VIRTUAL_WORLD_SCALE;
g_personView.cameraPosition[2] = 0.0f;
g_personView.cameraPosition[3] = 1.0;
g_personView.cameraDirection[0] = 0.0f;
g_personView.cameraDirection[1] = 0.0f;
g_personView.cameraDirection[2] = -1.0f;
g_personView.cameraUp[0] = 0.0f;
g_personView.cameraUp[1] = 1.0f;
g_personView.cameraUp[2] = 0.0f;
g_personView.fov = 60.0f;
g_activeView = &g_personView;
if (!glusImageLoadTga(NORMAL_MAP, &image))
{
printf("Could not load normal picture '%s'!\n", NORMAL_MAP);
return GLUS_FALSE;
}
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glGenTextures(1, &g_normalMapTexture);
glBindTexture(GL_TEXTURE_RECTANGLE, g_normalMapTexture);
glTexImage2D(GL_TEXTURE_RECTANGLE, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glusImageDestroyTga(&image);
if (!glusImageLoadTga(HEIGHT_MAP, &image))
{
printf("Could not load height picture '%s'!\n", HEIGHT_MAP);
return GLUS_FALSE;
}
glGenTextures(1, &g_heightMapTexture);
glBindTexture(GL_TEXTURE_RECTANGLE, g_heightMapTexture);
glTexImage2D(GL_TEXTURE_RECTANGLE, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
g_sMapExtend = (GLfloat) image.width;
g_tMapExtend = (GLfloat) image.height;
glusImageDestroyTga(&image);
// Calculate the detail level for the s and ...
sMaxDetailLevel = (GLuint) floorf(logf(g_sMapExtend) / logf(2.0f));
// ... t extend
tMaxDetailLevel = (GLuint) floorf(logf(g_tMapExtend) / logf(2.0f));
overallMaxDetailLevel = glusMathMinf(sMaxDetailLevel, tMaxDetailLevel);
// Do checking of calculated parameters
if (MINIMUM_DETAIL_LEVEL > overallMaxDetailLevel)
{
printf("Detail level to high %d > %d\n", MINIMUM_DETAIL_LEVEL, overallMaxDetailLevel);
return GLUS_FALSE;
}
if (MINIMUM_DETAIL_LEVEL + DETAIL_LEVEL_FIRST_PASS > overallMaxDetailLevel)
{
printf("First pass detail level to high %d > %d\n", MINIMUM_DETAIL_LEVEL + DETAIL_LEVEL_FIRST_PASS, overallMaxDetailLevel);
return GLUS_FALSE;
}
if (powf(2.0f, overallMaxDetailLevel - (MINIMUM_DETAIL_LEVEL + DETAIL_LEVEL_FIRST_PASS)) > 32.0f)
{
printf("Tessellation level to high %d > 32\n", (GLint) powf(2.0f, overallMaxDetailLevel - (MINIMUM_DETAIL_LEVEL + DETAIL_LEVEL_FIRST_PASS)));
return GLUS_FALSE;
}
detailStep = powf(2.0f, overallMaxDetailLevel - MINIMUM_DETAIL_LEVEL);
g_sNumPoints = (GLuint) ceilf(g_sMapExtend / detailStep) - 1;
g_tNumPoints = (GLuint) ceilf(g_tMapExtend / detailStep) - 1;
//
// Generate the flat terrain mesh.
//
map = (GLUSfloat*) malloc(g_sNumPoints * g_tNumPoints * 2 * sizeof(GLfloat));
indices = (GLuint*) malloc(g_sNumPoints * g_tNumPoints * sizeof(GLuint));
for (t = 0; t < g_tNumPoints; t++)
{
for (s = 0; s < g_sNumPoints; s++)
{
map[t * g_sNumPoints * 2 + s * 2 + 0] = 0.5f + detailStep / 2.0f + (GLfloat) s * detailStep;
map[t * g_sNumPoints * 2 + s * 2 + 1] = 0.5f + detailStep / 2.0f + (GLfloat) t * detailStep;
indices[t * g_sNumPoints + s + 0] = (t + 0) * g_sNumPoints + s + 0;
}
}
//
// Transferring vertices and indices into GPU
//
// Pass one
glGenBuffers(1, &g_verticesPassOneVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesPassOneVBO);
glBufferData(GL_ARRAY_BUFFER, g_sNumPoints * g_tNumPoints * 2 * sizeof(GLfloat), map, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &g_indicesPassOneVBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesPassOneVBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, g_sNumPoints * g_tNumPoints * sizeof(GLuint), indices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
// Pass two.
glGenBuffers(1, &g_verticesPassTwoVBO);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesPassTwoVBO);
// Calculate enough space!
glBufferData(GL_ARRAY_BUFFER, g_sNumPoints * g_tNumPoints * (GLuint) pow(4, DETAIL_LEVEL_FIRST_PASS + 1) * 2 * sizeof(GLfloat), 0, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
//
free(map);
map = 0;
free(indices);
indices = 0;
//
if (!glusImageLoadTga(COLOR_MAP, &image))
{
printf("Could not load color picture '%s'!\n", COLOR_MAP);
return GLUS_FALSE;
}
glGenTextures(1, &g_colorMapTexture);
glBindTexture(GL_TEXTURE_2D, g_colorMapTexture);
glTexImage2D(GL_TEXTURE_2D, 0, image.format, image.width, image.height, 0, image.format, GL_UNSIGNED_BYTE, image.data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glusImageDestroyTga(&image);
//
glGenQueries(1, &g_transformFeedbackQuery);
//
// Creating the shader program.
//
// Pass one.
glusFileLoadText("../Example14/shader/PassOne.vert.glsl", &vertexSource);
glusFileLoadText("../Example14/shader/PassOne.geom.glsl", &geometrySource);
glusFileLoadText("../Example14/shader/PassOne.frag.glsl", &fragmentSource);
// Compile and ...
glusProgramCreateFromSource(&g_programPassOne, (const GLUSchar**) &vertexSource.text, 0, 0, (const GLUSchar**) &geometrySource.text, (const GLUSchar**) &fragmentSource.text);
// ... add the transform variable ...
glTransformFeedbackVaryings(g_programPassOne.program, 1, (const GLchar**) &TRANSFORM_VARYING, GL_SEPARATE_ATTRIBS);
// ... and link the program
if (!glusProgramLink(&g_programPassOne))
{
printf("Could not build program one\n");
return GLUS_FALSE;
}
// Destroy the text resource
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&geometrySource);
glusFileDestroyText(&fragmentSource);
g_halfDetailStepPassOneLocation = glGetUniformLocation(g_programPassOne.program, "u_halfDetailStep");
g_detailLevelPassOneLocation = glGetUniformLocation(g_programPassOne.program, "u_detailLevel");
g_fovRadiusPassOneLocation = glGetUniformLocation(g_programPassOne.program, "u_fovRadius");
g_positionTextureSpacePassOneLocation = glGetUniformLocation(g_programPassOne.program, "u_positionTextureSpace");
g_leftNormalTextureSpacePassOneLocation = glGetUniformLocation(g_programPassOne.program, "u_leftNormalTextureSpace");
g_rightNormalTextureSpacePassOneLocation = glGetUniformLocation(g_programPassOne.program, "u_rightNormalTextureSpace");
g_backNormalTextureSpacePassOneLocation = glGetUniformLocation(g_programPassOne.program, "u_backNormalTextureSpace");
// Pass two.
glusFileLoadText("../Example14/shader/PassTwo.vert.glsl", &vertexSource);
glusFileLoadText("../Example14/shader/PassTwo.cont.glsl", &controlSource);
glusFileLoadText("../Example14/shader/PassTwo.eval.glsl", &evaluationSource);
glusFileLoadText("../Example14/shader/PassTwo.geom.glsl", &geometrySource);
glusFileLoadText("../Example14/shader/PassTwo.frag.glsl", &fragmentSource);
if (!glusProgramBuildFromSource(&g_shaderProgramPassTwo, (const GLUSchar**) &vertexSource.text, (const GLUSchar**) &controlSource.text, (const GLUSchar**) &evaluationSource.text, (const GLUSchar**) &geometrySource.text, (const GLUSchar**) &fragmentSource.text))
{
printf("Could not build program two\n");
return GLUS_FALSE;
}
glusFileDestroyText(&vertexSource);
glusFileDestroyText(&controlSource);
glusFileDestroyText(&evaluationSource);
glusFileDestroyText(&geometrySource);
glusFileDestroyText(&fragmentSource);
g_maxTessellationLevelPassTwoLocation = glGetUniformLocation(g_shaderProgramPassTwo.program, "u_maxTessellationLevel");
g_quadrantStepPassTwoLocation = glGetUniformLocation(g_shaderProgramPassTwo.program, "u_quadrantStep");
g_positionTextureSpacePassTwoLocation = glGetUniformLocation(g_shaderProgramPassTwo.program, "u_positionTextureSpace");
g_heightMapTexturePassTwoLocation = glGetUniformLocation(g_shaderProgramPassTwo.program, "u_heightMapTexture");
g_normalMapTexturePassTwoLocation = glGetUniformLocation(g_shaderProgramPassTwo.program, "u_normalMapTexture");
g_tmvpPassTwoLocation = glGetUniformLocation(g_shaderProgramPassTwo.program, "u_tmvpMatrix");
g_lightDirectionPassTwoLocation = glGetUniformLocation(g_shaderProgramPassTwo.program, "u_lightDirection");
g_colorMapTexturePassTwoLocation = glGetUniformLocation(g_shaderProgramPassTwo.program, "u_colorMapTexture");
//
// One time matrix calculations to convert between texture and world space
glusMatrix4x4Identityf(g_textureToWorldMatrix);
glusMatrix4x4Identityf(textureToWorldNormalMatrix);
glusMatrix4x4Scalef(g_textureToWorldMatrix, HORIZONTAL_PIXEL_SPACING * METERS_TO_VIRTUAL_WORLD_SCALE, VERTICAL_PIXEL_RANGE * METERS_TO_VIRTUAL_WORLD_SCALE, HORIZONTAL_PIXEL_SPACING * METERS_TO_VIRTUAL_WORLD_SCALE);
// Skip this scale for the normal matrix
glusMatrix4x4Scalef(g_textureToWorldMatrix, 1.0f, 1.0f, -1.0f);
glusMatrix4x4Scalef(textureToWorldNormalMatrix, 1.0f, 1.0f, -1.0f);
glusMatrix4x4Translatef(g_textureToWorldMatrix, -g_sMapExtend / 2.0f, 0.0f, -g_tMapExtend / 2.0f);
// No need for the translation matrix in the normal matrix
glusMatrix4x4Copyf(g_worldToTextureMatrix, g_textureToWorldMatrix, GLUS_FALSE);
glusMatrix4x4Inversef(g_worldToTextureMatrix);
glusMatrix4x4Copyf(g_worldToTextureNormalMatrix, textureToWorldNormalMatrix, GLUS_FALSE);
glusMatrix4x4Inversef(g_worldToTextureNormalMatrix);
// Pass one
glUseProgram(g_programPassOne.program);
glUniform1f(g_halfDetailStepPassOneLocation, detailStep / 2.0f);
glUniform1ui(g_detailLevelPassOneLocation, DETAIL_LEVEL_FIRST_PASS);
glUniform1f(g_fovRadiusPassOneLocation, FOV_RADIUS / HORIZONTAL_PIXEL_SPACING * METERS_TO_VIRTUAL_WORLD_SCALE);
glGenVertexArrays(1, &g_vaoPassOne);
glBindVertexArray(g_vaoPassOne);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesPassOneVBO);
// First 0 is the location = 0. See shader source
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
// Enable location = 0
glEnableVertexAttribArray(0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_indicesPassOneVBO);
// Pass two
glUseProgram(g_shaderProgramPassTwo.program);
glUniform3fv(g_lightDirectionPassTwoLocation, 1, lightDirection);
glUniform1ui(g_maxTessellationLevelPassTwoLocation, overallMaxDetailLevel - (MINIMUM_DETAIL_LEVEL + DETAIL_LEVEL_FIRST_PASS));
glUniform1i(g_quadrantStepPassTwoLocation, QUADRANT_STEP);
glGenVertexArrays(1, &g_vaoPassTwo);
glBindVertexArray(g_vaoPassTwo);
glBindBuffer(GL_ARRAY_BUFFER, g_verticesPassTwoVBO);
// First 0 is the location = 0. See shader source
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
// Enable location = 0
glEnableVertexAttribArray(0);
//
glActiveTexture(GL_TEXTURE0);
glUniform1i(g_heightMapTexturePassTwoLocation, 0);
glBindTexture(GL_TEXTURE_RECTANGLE, g_heightMapTexture);
glActiveTexture(GL_TEXTURE1);
glUniform1i(g_colorMapTexturePassTwoLocation, 1);
glBindTexture(GL_TEXTURE_2D, g_colorMapTexture);
glActiveTexture(GL_TEXTURE2);
glUniform1i(g_normalMapTexturePassTwoLocation, 2);
glBindTexture(GL_TEXTURE_RECTANGLE, g_normalMapTexture);
//
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glPatchParameteri(GL_PATCH_VERTICES, 4);
return GLUS_TRUE;
}
