//function to render scene given the combined modelview projection matrix
//and a shader
void DrawScene(const glm::mat4& MVP, GLSLShader& shader) {
//enable alpha blending with over compositing
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//bind the cube vertex array object
glBindVertexArray(cubeVAOID);
//bind the shader
shader.Use();
//for all cubes
for(int k=-1;k<=1;k++) {
for(int j=-1;j<=1;j++) {
int index =0;
for(int i=-1;i<=1;i++) {
GL_CHECK_ERRORS
//set the modelling transformation and shader uniforms
glm::mat4 T = glm::translate(glm::mat4(1), glm::vec3(i*2,j*2,k*2));
glUniform4fv(shader("vColor"),1, &(box_colors[index++].x));
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(MVP*R*T));
//draw the cube
glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_SHORT, 0);
GL_CHECK_ERRORS
}
}
}
//unbind shader
shader.UnUse();
//unbind vertex array object
glBindVertexArray(0);
}
//display callback
void OnRender() {
//get the elapse time
time = glutGet(GLUT_ELAPSED_TIME)/1000.0f * SPEED;
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set teh camera viewing transformation
glm::mat4 T = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(T, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 MV = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
glm::mat4 MVP = P*MV;
//bind the shader
shader.Use();
//set the shader uniforms
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(MVP));
glUniform1f(shader("time"), time);
//draw the mesh triangles
glDrawElements(GL_TRIANGLES, TOTAL_INDICES, GL_UNSIGNED_SHORT, 0);
//unbind the shader
shader.UnUse();
//swap front and back buffers to show the rendered result
glutSwapBuffers();
}
//display function
void OnRender() {
//clear colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the camera transform
glm::mat4 T = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(T, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 Ry = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
glm::mat4 MV = Ry;
glm::mat4 MVP = P*MV;
//since we have kept the terrain vertex array object bound
//it is still bound to the context so we can directly call draw element
//which will draw vertices from the bound vertex array object
//bind the terrain shader
shader.Use();
//pass shader uniforms
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(MVP));
//draw terrain mesh
glDrawElements(GL_TRIANGLES, TOTAL_INDICES, GL_UNSIGNED_INT, 0);
//unbind shader
shader.UnUse();
//swap front and back buffers to show the rendered result
glutSwapBuffers();
}
void onInit() {
//tex = loadImage("../textures/texture.png");
tex = loadImage("../textures/dots.png");
tex2 = loadImage("../textures/dots.png");
ctv = new CTextureViewer(0, "../shaders/textureViewer.vs", "../shaders/textureViewer.frag");
ctv->setTexture(tex);
ctv->setTexture2(tex2);
hist.LoadFromFile(GL_VERTEX_SHADER, "../shaders/histogram.vs");
hist.LoadFromFile(GL_FRAGMENT_SHADER, "../shaders/histogram.frag");
hist.CreateAndLinkProgram();
hist.Use();
//Create uniforms and attributes (filled later)
hist.AddAttribute("vPosition");
hist.AddUniform("tex");
hist.AddUniform("textureWidth");
hist.AddUniform("textureHeight");
hist.UnUse();
initTex();
initPointVBO();
initHistogramFBO();
}
//renders sphere using the render shader
void DrawSphere(const glm::mat4& mvp) {
renderShader.Use();
glBindVertexArray(sphereVAOID);
glUniformMatrix4fv(renderShader("MVP"), 1, GL_FALSE, glm::value_ptr(mvp));
glDrawElements(GL_TRIANGLES, total_sphere_indices,GL_UNSIGNED_SHORT,0);
renderShader.UnUse();
}
void DrawCloth()
{
renderShader.Use();
glBindVertexArray(clothVAOID);
glUniformMatrix4fv(renderShader("MVP"), 1, GL_FALSE, glm::value_ptr(mMVP));
glDrawElements(GL_TRIANGLES, indices.size(),GL_UNSIGNED_SHORT,0);
//glBindVertexArray(0);
renderShader.UnUse();
}
void DrawGrid()
{
renderShader.Use();
glBindVertexArray(gridVAOID);
glUniformMatrix4fv(renderShader("MVP"), 1, GL_FALSE, glm::value_ptr(mMVP));
glDrawElements(GL_LINES, grid_indices.size(),GL_UNSIGNED_SHORT,0);
glBindVertexArray(0);
renderShader.UnUse();
}
void computeHistogram() {
glViewport(0, 0, WIDTH, HEIGHT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.0, 0.0, 0.0, 0.0);
glDisable(GL_DEPTH_TEST);
//Enable blending
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
//Additive
glBlendEquation(GL_FUNC_ADD);
hist.Use();
glBindBuffer(GL_ARRAY_BUFFER, HistogramVBO);
glVertexAttribPointer(hist["vPosition"], 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GL_FLOAT), (void*)0);
glEnableVertexAttribArray(hist["vPosition"]);
glUniform1i(hist("tex"), 0);
glUniform1f(hist("textureWidth"), (float)WIDTH);
glUniform1f(hist("textureHeight"), (float)HEIGHT);
glBindFramebuffer(GL_FRAMEBUFFER, FBO);
//glClear(GL_COLOR_BUFFER_BIT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//Compute histogram
glDrawArrays(GL_POINTS, 0, WIDTH*HEIGHT);
glBindBuffer(GL_ARRAY_BUFFER, 0);
hist.UnUse();
//Disable blending
glDisable(GL_BLEND);
float hPixels[256];
glReadPixels(0, 0, 256, 1, GL_BLUE, GL_FLOAT, hPixels);
int sum = 0;
if (printed != 0)
{
cout << "\n\n-----------\n\n";
for(int j = 0; j < 256; j++)
{
//if((j % 3) == 0)
cout << j << ":" << hPixels[j] << endl;
sum += hPixels[j];
}
cout << endl << sum << endl;
printed--;
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
//display callback function
void OnRender() {
GL_CHECK_ERRORS
//clear colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the camera transform
glm::mat4 T = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(T, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 MV = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
//1) Render scene from the light's POV
//enable rendering to FBO
glBindFramebuffer(GL_FRAMEBUFFER,fboID);
//clear depth buffer
glClear(GL_DEPTH_BUFFER_BIT);
//reset viewport to the shadow map texture size
glViewport(0,0,SHADOWMAP_WIDTH, SHADOWMAP_HEIGHT);
//enable front face culling
glCullFace(GL_FRONT);
//draw scene from the point of view of light
DrawScene(MV_L, P_L);
//enable back face culling
glCullFace(GL_BACK);
//restore normal rendering path
//unbind FBO, set the default back buffer and reset the viewport to screen size
glBindFramebuffer(GL_FRAMEBUFFER,0);
glDrawBuffer(GL_BACK_LEFT);
glViewport(0,0,WIDTH, HEIGHT);
//2) Render scene from point of view of eye
DrawScene(MV, P, 0 );
//bind light gizmo vertex array object
glBindVertexArray(lightVAOID); {
//set the flat shader
flatshader.Use();
//set the light's transform and render 3 lines
glm::mat4 T = glm::translate(glm::mat4(1), lightPosOS);
glUniformMatrix4fv(flatshader("MVP"), 1, GL_FALSE, glm::value_ptr(P*MV*T));
glDrawArrays(GL_LINES, 0, 6);
//unbind shader
flatshader.UnUse();
}
//unbind the vertex array object
glBindVertexArray(0);
//swap front and back buffers to show the rendered result
glutSwapBuffers();
}
void OnRender() {
glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);
GL_CHECK_ERRORS
shader.Use();
drawDefaultBox();
shader.UnUse();
glutSwapBuffers();
}
void DrawClothPoints()
{
particleShader.Use();
//glBindVertexArray(clothVAOID);
glUniform1i(particleShader("selected_index"), selected_index);
glUniformMatrix4fv(particleShader("MV"), 1, GL_FALSE, glm::value_ptr(mMV));
glUniformMatrix4fv(particleShader("MVP"), 1, GL_FALSE, glm::value_ptr(mMVP));
//draw the masses last
glDrawArrays(GL_POINTS, 0, total_points);
glBindVertexArray(0);
particleShader.UnUse();
}
//display function
void OnRender() {
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//bind shader
shader.Use();
//draw the full screen quad
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
//unbind shader
shader.UnUse();
//swap front and back buffers to show the rendered result
glutSwapBuffers();
}
void InitShaders(void)
{
shader.LoadFromFile(GL_VERTEX_SHADER, "../CGE_solarsystem/shader.vert");
shader.LoadFromFile(GL_FRAGMENT_SHADER, "../CGE_solarsystem/shader.frag");
shader.CreateAndLinkProgram();
shader.Use();
shader.AddAttribute("vVertex");
shader.AddAttribute("vUV");
shader.AddUniform("MVP");
shader.AddUniform("textureMap");
glUniform1i(shader("textureMap"), 0);
shader.UnUse();
GL_CHECK_ERRORS
}
void OnRender() {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glm::mat4 T = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(T, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 Ry = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
glm::mat4 MV = Ry;
glm::mat4 MVP = P*MV;
//glBindVertexArray(vaoID);
shader.Use();
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(MVP));
glDrawElements(GL_TRIANGLES, TOTAL_INDICES, GL_UNSIGNED_INT, 0);
shader.UnUse();
//glBindVertexArray(0);
glutSwapBuffers();
}
//display callback function
void OnRender() {
GL_CHECK_ERRORS
//set the camera transform
glm::mat4 Tr = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(Tr, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 MV = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//get the combined modelview projection matrix
glm::mat4 MVP = P*MV;
//render the grid object
grid->Render(glm::value_ptr(MVP));
//set the modelling transform to move the marhing result to origin
glm::mat4 T = glm::translate(glm::mat4(1), glm::vec3(-0.5,-0.5,-0.5));
//if rendering mode set to wireframe we set the front and back
//polygon mode to line
if(bWireframe)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
//set the volume marcher vertex array object
glBindVertexArray(volumeMarcherVAO);
//bind the shader
shader.Use();
//set the shader uniforms
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(MVP*T));
//render the triangles
glDrawArrays(GL_TRIANGLES, 0, marcher->GetTotalVertices());
//unbind the shader
shader.UnUse();
//restore the default polygon mode
if(bWireframe)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
//swap front and back buffers to show the rendered result
glutSwapBuffers();
}
//display callback function
void OnRender() {
GL_CHECK_ERRORS
//set the camera transform
glm::mat4 Tr = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(Tr, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 MV = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
//get the camera position
glm::vec3 camPos = glm::vec3(glm::inverse(MV)*glm::vec4(0,0,0,1));
//clear colour and depth buffer
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//get the combined modelview projection matrix
glm::mat4 MVP = P*MV;
//render grid
grid->Render(glm::value_ptr(MVP));
//enable blending and bind the cube vertex array object
glEnable(GL_BLEND);
glBindVertexArray(cubeVAOID);
//bind the raycasting shader
shader.Use();
//pass shader uniforms
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(MVP));
glUniform3fv(shader("camPos"), 1, &(camPos.x));
//render the cube
glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_SHORT, 0);
//unbind the raycasting shader
shader.UnUse();
//disable blending
glDisable(GL_BLEND);
//swap front and back buffers to show the rendered result
glutSwapBuffers();
}
//display callback function
void OnRender() {
//clear colour and depth buffer
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the camera transformation
glm::mat4 T = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(T, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 V = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
glm::mat4 PV = P*V;
//bind the shader
shader.Use();
//set the shader uniforms
glUniformMatrix4fv(shader("PV"), 1, GL_FALSE, glm::value_ptr(PV));
glUniform1i(shader("sub_divisions"), sub_divisions);
//render instanced geometry
glDrawElementsInstanced(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0, 4);
//unbind shader
shader.UnUse();
//swap front and back buffers to show the rendered result
glutSwapBuffers();
}
void OnInit() {
GL_CHECK_ERRORS
//setup shader
shader.LoadFromFile(GL_VERTEX_SHADER, "shaders/shader.vert");
shader.LoadFromFile(GL_GEOMETRY_SHADER, "shaders/shader.geom");
shader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/shader.frag");
shader.CreateAndLinkProgram();
shader.Use();
shader.AddAttribute("vVertex");
shader.AddUniform("heightMapTexture");
shader.AddUniform("scale");
shader.AddUniform("half_scale");
shader.AddUniform("HALF_TERRAIN_SIZE");
shader.AddUniform("MVP");
glUniform1i(shader("heightMapTexture"), 0);
glUniform2i(shader("HALF_TERRAIN_SIZE"), TERRAIN_WIDTH>>1, TERRAIN_DEPTH>>1);
glUniform1f(shader("scale"), scale);
glUniform1f(shader("half_scale"), half_scale);
shader.UnUse();
GL_CHECK_ERRORS
//setup geometry
//fill indices array
GLuint* id=&indices[0];
int i=0, j=0;
//setup vertices
int count = 0;
for( j=0;j<TERRAIN_DEPTH;j++) {
for( i=0;i<TERRAIN_WIDTH;i++) {
/*
vertices[count] = glm::vec3( ( (float(i)/(TERRAIN_WIDTH-1))*2.0f-1)*TERRAIN_HALF_WIDTH,
(pData[count]/255.0f)*scale-half_scale,
( (float(j)/(TERRAIN_DEPTH-1))*2.0-1)*TERRAIN_HALF_DEPTH);
*/
vertices[count] = glm::vec3( (float(i)/(TERRAIN_WIDTH-1)),
0,
(float(j)/(TERRAIN_DEPTH-1)));
count++;
}
}
for (i = 0; i < TERRAIN_DEPTH-1; i++) {
for (j = 0; j < TERRAIN_WIDTH-1; j++) {
int i0 = j+ i*TERRAIN_WIDTH;
int i1 = i0+1;
int i2 = i0+TERRAIN_WIDTH;
int i3 = i2+1;
*id++ = i0;
*id++ = i2;
*id++ = i1;
*id++ = i1;
*id++ = i2;
*id++ = i3;
}
}
GL_CHECK_ERRORS
//setup vao and vbo stuff
glGenVertexArrays(1, &vaoID);
glGenBuffers(1, &vboVerticesID);
glGenBuffers(1, &vboIndicesID);
glBindVertexArray(vaoID);
glBindBuffer (GL_ARRAY_BUFFER, vboVerticesID);
glBufferData (GL_ARRAY_BUFFER, sizeof(vertices), &vertices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
glEnableVertexAttribArray(shader["vVertex"]);
glVertexAttribPointer(shader["vVertex"], 3, GL_FLOAT, GL_FALSE,0,0);
GL_CHECK_ERRORS
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIndicesID);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), &indices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//load the heightmap texture using SOIL
int texture_width = 0, texture_height = 0, format=0;
GLubyte* pData = SOIL_load_image(filename.c_str(), &texture_width, &texture_height, &format, SOIL_LOAD_L);
//setup OpenGL texture
glGenTextures(1, &heightMapTextureID);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, heightMapTextureID);
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);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, texture_width, texture_height, 0, GL_RED, GL_UNSIGNED_BYTE, pData);
free(pData);
GL_CHECK_ERRORS
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
GL_CHECK_ERRORS
cout<<"Initialization successfull"<<endl;
}
//scene rendering function
void DrawScene(const glm::mat4& View, const glm::mat4& Proj, int isLightPass = 1) {
GL_CHECK_ERRORS
//bind the current shader
shader.Use();
//render plane first
glBindVertexArray(planeVAOID); {
//set the shader uniforms
glUniform3fv(shader("light_position"),1, &(lightPosOS.x));
glUniformMatrix4fv(shader("S"), 1, GL_FALSE, glm::value_ptr(S));
glUniformMatrix4fv(shader("M"), 1, GL_FALSE, glm::value_ptr(glm::mat4(1)));
glUniform1i(shader("bIsLightPass"), isLightPass);
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(Proj*View));
glUniformMatrix4fv(shader("MV"), 1, GL_FALSE, glm::value_ptr(View));
glUniformMatrix3fv(shader("N"), 1, GL_FALSE, glm::value_ptr(glm::inverseTranspose(glm::mat3(View))));
glUniform3f(shader("diffuse_color"), 1.0f,1.0f,1.0f);
//draw plane triangles
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
}
//render the cube
glBindVertexArray(cubeVAOID); {
//set the cube's transform
glm::mat4 T = glm::translate(glm::mat4(1), glm::vec3(-1,1,0));
glm::mat4 M = T;
glm::mat4 MV = View*M;
glm::mat4 MVP = Proj*MV;
//pass shader uniforms
glUniformMatrix4fv(shader("S"), 1, GL_FALSE, glm::value_ptr(S));
glUniformMatrix4fv(shader("M"), 1, GL_FALSE, glm::value_ptr(M));
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(MVP));
glUniformMatrix4fv(shader("MV"), 1, GL_FALSE, glm::value_ptr(MV));
glUniformMatrix3fv(shader("N"), 1, GL_FALSE, glm::value_ptr(glm::inverseTranspose(glm::mat3(MV))));
glUniform3f(shader("diffuse_color"), 1.0f,0.0f,0.0f);
//draw cube triangles
glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_SHORT, 0);
}
//render the sphere
glBindVertexArray(sphereVAOID); {
//set the sphere's transform
glm::mat4 T = glm::translate(glm::mat4(1), glm::vec3(1,1,0));
glm::mat4 M = T;
glm::mat4 MV = View*M;
glm::mat4 MVP = Proj*MV;
//set the shader uniforms
glUniformMatrix4fv(shader("S"), 1, GL_FALSE, glm::value_ptr(S));
glUniformMatrix4fv(shader("M"), 1, GL_FALSE, glm::value_ptr(M));
glUniformMatrix4fv(shader("MVP"), 1, GL_FALSE, glm::value_ptr(MVP));
glUniformMatrix4fv(shader("MV"), 1, GL_FALSE, glm::value_ptr(MV));
glUniformMatrix3fv(shader("N"), 1, GL_FALSE, glm::value_ptr(glm::inverseTranspose(glm::mat3(MV))));
glUniform3f(shader("diffuse_color"), 0.0f, 0.0f, 1.0f);
//draw sphere triangles
glDrawElements(GL_TRIANGLES, totalSphereTriangles, GL_UNSIGNED_SHORT, 0);
}
//unbind shader
shader.UnUse();
GL_CHECK_ERRORS
}
//OpenGL initialization
void OnInit() {
//load the flat shader
flatshader.LoadFromFile(GL_VERTEX_SHADER, "shaders/shader.vert");
flatshader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/shader.frag");
//compile and link shader
flatshader.CreateAndLinkProgram();
flatshader.Use();
//add attributes and uniforms
flatshader.AddAttribute("vVertex");
flatshader.AddUniform("MVP");
flatshader.UnUse();
//load the shadow mapping shader
shader.LoadFromFile(GL_VERTEX_SHADER, "shaders/PointLightShadowMapped.vert");
shader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/PointLightShadowMapped.frag");
//compile and link shader
shader.CreateAndLinkProgram();
shader.Use();
//add attributes and uniforms
shader.AddAttribute("vVertex");
shader.AddAttribute("vNormal");
shader.AddUniform("MVP");
shader.AddUniform("MV");
shader.AddUniform("M");
shader.AddUniform("N");
shader.AddUniform("S");
shader.AddUniform("light_position");
shader.AddUniform("diffuse_color");
shader.AddUniform("bIsLightPass");
shader.AddUniform("shadowMap");
//pass value of constant uniforms at initialization
glUniform1i(shader("shadowMap"),0);
shader.UnUse();
GL_CHECK_ERRORS
//setup sphere geometry
CreateSphere(1.0f,10,10, vertices, indices);
//setup sphere vao and vbo stuff
glGenVertexArrays(1, &sphereVAOID);
glGenBuffers(1, &sphereVerticesVBO);
glGenBuffers(1, &sphereIndicesVBO);
glBindVertexArray(sphereVAOID);
glBindBuffer (GL_ARRAY_BUFFER, sphereVerticesVBO);
//pass vertices to the buffer object
glBufferData (GL_ARRAY_BUFFER, vertices.size()*sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attribute array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex),0);
GL_CHECK_ERRORS
//enable vertex attribute array for normal
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex), (const GLvoid*)(offsetof(Vertex, normal)));
GL_CHECK_ERRORS
//pass sphere indices to element array buffer
glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, sphereIndicesVBO);
glBufferData (GL_ELEMENT_ARRAY_BUFFER, indices.size()*sizeof(GLushort), &indices[0], GL_STATIC_DRAW);
//store the total number of sphere triangles
totalSphereTriangles = indices.size();
//clear the vertices and indices vectors as we will reuse them
//for cubes
vertices.clear();
indices.clear();
//setup cube geometry
CreateCube(2,vertices, indices);
//setup cube vao and vbo stuff
glGenVertexArrays(1, &cubeVAOID);
glGenBuffers(1, &cubeVerticesVBO);
glGenBuffers(1, &cubeIndicesVBO);
glBindVertexArray(cubeVAOID);
glBindBuffer (GL_ARRAY_BUFFER, cubeVerticesVBO);
//pass vertices to the buffer object
glBufferData (GL_ARRAY_BUFFER, vertices.size()*sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attribute array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex),0);
GL_CHECK_ERRORS
//enable vertex attribute array for normals
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex), (const GLvoid*)(offsetof(Vertex, normal)));
GL_CHECK_ERRORS
//pass cube indices to element array buffer
glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, cubeIndicesVBO);
glBufferData (GL_ELEMENT_ARRAY_BUFFER, indices.size()*sizeof(GLushort), &indices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//clear the vertices and indices vectors as we will reuse them
//for plane
vertices.clear();
indices.clear();
//create a plane object
CreatePlane(100,100,vertices, indices);
//setup plane VAO and VBO
glGenVertexArrays(1, &planeVAOID);
glGenBuffers(1, &planeVerticesVBO);
glGenBuffers(1, &planeIndicesVBO);
glBindVertexArray(planeVAOID);
glBindBuffer (GL_ARRAY_BUFFER, planeVerticesVBO);
//pass vertices to the buffer object
glBufferData (GL_ARRAY_BUFFER, vertices.size()*sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attribute array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex),0);
GL_CHECK_ERRORS
//enable vertex attribute array for normals
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex), (const GLvoid*)(offsetof(Vertex, normal)));
GL_CHECK_ERRORS
//pass plane indices to element array buffer
glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, planeIndicesVBO);
glBufferData (GL_ELEMENT_ARRAY_BUFFER, indices.size()*sizeof(GLushort), &indices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//setup vao and vbo stuff for the light position crosshair
glm::vec3 crossHairVertices[6];
crossHairVertices[0] = glm::vec3(-0.5f,0,0);
crossHairVertices[1] = glm::vec3(0.5f,0,0);
crossHairVertices[2] = glm::vec3(0, -0.5f,0);
crossHairVertices[3] = glm::vec3(0, 0.5f,0);
crossHairVertices[4] = glm::vec3(0,0, -0.5f);
crossHairVertices[5] = glm::vec3(0,0, 0.5f);
//setup light gizmo vertex array and buffer object
glGenVertexArrays(1, &lightVAOID);
glGenBuffers(1, &lightVerticesVBO);
glBindVertexArray(lightVAOID);
glBindBuffer (GL_ARRAY_BUFFER, lightVerticesVBO);
//pass light crosshair gizmo vertices to buffer object
glBufferData (GL_ARRAY_BUFFER, sizeof(crossHairVertices), &(crossHairVertices[0].x), GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attribute array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0,0);
GL_CHECK_ERRORS
//get light position from spherical coordinates
lightPosOS.x = radius * cos(theta)*sin(phi);
lightPosOS.y = radius * cos(phi);
lightPosOS.z = radius * sin(theta)*sin(phi);
//setup the shadowmap texture
glGenTextures(1, &shadowMapTexID);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, shadowMapTexID);
//set texture parameters
GLfloat border[4]={1,0,0,0};
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_COMPARE_MODE,GL_COMPARE_REF_TO_TEXTURE);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_COMPARE_FUNC,GL_LEQUAL);
glTexParameterfv(GL_TEXTURE_2D,GL_TEXTURE_BORDER_COLOR,border);
glTexImage2D(GL_TEXTURE_2D,0,GL_DEPTH_COMPONENT24,SHADOWMAP_WIDTH,SHADOWMAP_HEIGHT,0,GL_DEPTH_COMPONENT,GL_UNSIGNED_BYTE,NULL);
//set up FBO to get the depth component
glGenFramebuffers(1,&fboID);
glBindFramebuffer(GL_FRAMEBUFFER,fboID);
glFramebufferTexture2D(GL_FRAMEBUFFER,GL_DEPTH_ATTACHMENT,GL_TEXTURE_2D,shadowMapTexID,0);
//check framebuffer completeness status
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if(status == GL_FRAMEBUFFER_COMPLETE) {
cout<<"FBO setup successful."<<endl;
} else {
cout<<"Problem in FBO setup."<<endl;
}
//unbind FBO
glBindFramebuffer(GL_FRAMEBUFFER,0);
//set the light MV, P and bias matrices
MV_L = glm::lookAt(lightPosOS,glm::vec3(0,0,0),glm::vec3(0,1,0));
P_L = glm::perspective(glm::radians(50.0f),1.0f,1.0f, 25.0f);
B = glm::scale(glm::translate(glm::mat4(1),glm::vec3(0.5,0.5,0.5)), glm::vec3(0.5,0.5,0.5));
BP = B*P_L;
S = BP*MV_L;
//enable depth testing and culling
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
cout<<"Initialization successfull"<<endl;
}
//OpenGL initialization
void OnInit() {
//set the instance modeling matrix
M[0] = glm::translate(glm::mat4(1), glm::vec3(-5,0,-5));
M[1] = glm::translate(M[0], glm::vec3(10,0,0));
M[2] = glm::translate(M[1], glm::vec3(0,0,10));
M[3] = glm::translate(M[2], glm::vec3(-10,0,0));
GL_CHECK_ERRORS
//load the shader
shader.LoadFromFile(GL_VERTEX_SHADER, "shaders/shader.vert");
shader.LoadFromFile(GL_GEOMETRY_SHADER, "shaders/shader.geom");
shader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/shader.frag");
//create and link shader
shader.CreateAndLinkProgram();
shader.Use();
//add attribute and uniform
shader.AddAttribute("vVertex");
shader.AddUniform("PV");
shader.AddUniform("M");
shader.AddUniform("sub_divisions");
//set values of constant uniforms at initialization
glUniform1i(shader("sub_divisions"), sub_divisions);
glUniformMatrix4fv(shader("M"), 4, GL_FALSE, glm::value_ptr(M[0]));
shader.UnUse();
GL_CHECK_ERRORS
//setup quad geometry
//setup quad vertices
vertices[0] = glm::vec3(-5,0,-5);
vertices[1] = glm::vec3(-5,0,5);
vertices[2] = glm::vec3(5,0,5);
vertices[3] = glm::vec3(5,0,-5);
//setup quad indices
GLushort* id=&indices[0];
*id++ = 0;
*id++ = 1;
*id++ = 2;
*id++ = 0;
*id++ = 2;
*id++ = 3;
GL_CHECK_ERRORS
//setup quad vao and vbo stuff
glGenVertexArrays(1, &vaoID);
glGenBuffers(1, &vboVerticesID);
glGenBuffers(1, &vboIndicesID);
glBindVertexArray(vaoID);
glBindBuffer (GL_ARRAY_BUFFER, vboVerticesID);
//pass the quad vertices to buffer object
glBufferData (GL_ARRAY_BUFFER, sizeof(vertices), &vertices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attribute array for position
glEnableVertexAttribArray(shader["vVertex"]);
glVertexAttribPointer(shader["vVertex"], 3, GL_FLOAT, GL_FALSE,0,0);
GL_CHECK_ERRORS
//pass the quad indices to element array buffer
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIndicesID);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), &indices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//set the polygon mode to render lines
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
GL_CHECK_ERRORS
cout<<"Initialization successfull"<<endl;
}
//display callback function
void OnRender() {
GL_CHECK_ERRORS
//camera transformation
glm::mat4 Tr = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(Tr, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 MV = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
//clear colour and depth buffer
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//get the combined modelview projection matrix
glm::mat4 MVP = P*MV;
//if we want to use depth peeling
if(bShowDepthPeeling) {
//bind the colour blending FBO
glBindFramebuffer(GL_FRAMEBUFFER, colorBlenderFBOID);
//set the first colour attachment as the draw buffer
glDrawBuffer(GL_COLOR_ATTACHMENT0);
//clear the colour and depth buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
// 1. In the first pass, we render normally with depth test enabled to get the nearest surface
glEnable(GL_DEPTH_TEST);
DrawScene(MVP, cubeShader);
// 2. Depth peeling + blending pass
int numLayers = (NUM_PASSES - 1) * 2;
//for each pass
for (int layer = 1; bUseOQ || layer < numLayers; layer++) {
int currId = layer % 2;
int prevId = 1 - currId;
//bind the current FBO
glBindFramebuffer(GL_FRAMEBUFFER, fbo[currId]);
//set the first colour attachment as draw buffer
glDrawBuffer(GL_COLOR_ATTACHMENT0);
//set clear colour to black
glClearColor(0, 0, 0, 0);
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//disbale blending and depth testing
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
//if we want to use occlusion query, we initiate it
if (bUseOQ) {
glBeginQuery(GL_SAMPLES_PASSED_ARB, queryId);
}
GL_CHECK_ERRORS
//bind the depth texture from the previous step
glBindTexture(GL_TEXTURE_RECTANGLE, depthTexID[prevId]);
//render scene with the front to back peeling shader
DrawScene(MVP, frontPeelShader);
//if we initiated the occlusion query, we end it
if (bUseOQ) {
glEndQuery(GL_SAMPLES_PASSED_ARB);
}
GL_CHECK_ERRORS
//bind the colour blender FBO
glBindFramebuffer(GL_FRAMEBUFFER, colorBlenderFBOID);
//render to its first colour attachment
glDrawBuffer(GL_COLOR_ATTACHMENT0);
//enable blending but disable depth testing
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
//change the blending equation to add
glBlendEquation(GL_FUNC_ADD);
//use separate blending function
glBlendFuncSeparate(GL_DST_ALPHA, GL_ONE,
GL_ZERO, GL_ONE_MINUS_SRC_ALPHA);
//bind the result from the previous iteration as texture
glBindTexture(GL_TEXTURE_RECTANGLE, texID[currId]);
//bind the blend shader and then draw a fullscreen quad
blendShader.Use();
DrawFullScreenQuad();
blendShader.UnUse();
//disable blending
glDisable(GL_BLEND);
GL_CHECK_ERRORS
//if we initiated the occlusion query, we get the query result
//that is the total number of samples
if (bUseOQ) {
GLuint sample_count;
glGetQueryObjectuiv(queryId, GL_QUERY_RESULT, &sample_count);
if (sample_count == 0) {
break;
}
}
}
GL_CHECK_ERRORS
// 3. Final render pass
//remove the FBO
glBindFramebuffer(GL_FRAMEBUFFER, 0);
//restore the default back buffer
glDrawBuffer(GL_BACK_LEFT);
//disable depth testing and blending
glDisable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
//bind the colour blender texture
glBindTexture(GL_TEXTURE_RECTANGLE, colorBlenderTexID);
//bind the final shader
finalShader.Use();
//set shader uniforms
glUniform4fv(finalShader("vBackgroundColor"), 1, &bg.x);
//draw full screen quad
DrawFullScreenQuad();
finalShader.UnUse();
} else {
//OpenGL initialization
void OnInit() {
GL_CHECK_ERRORS
//create a uniform grid of size 20x20 in XZ plane
grid = new CGrid(20,20);
GL_CHECK_ERRORS
//Load the raycasting shader
shader.LoadFromFile(GL_VERTEX_SHADER, "shaders/raycaster.vert");
shader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/raycaster.frag");
//compile and link the shader
shader.CreateAndLinkProgram();
shader.Use();
//add attributes and uniforms
shader.AddAttribute("vVertex");
shader.AddUniform("MVP");
shader.AddUniform("volume");
shader.AddUniform("camPos");
shader.AddUniform("step_size");
//pass constant uniforms at initialization
glUniform3f(shader("step_size"), 1.0f/XDIM, 1.0f/YDIM, 1.0f/ZDIM);
glUniform1i(shader("volume"),0);
shader.UnUse();
GL_CHECK_ERRORS
//load volume data
if(LoadVolume()) {
std::cout<<"Volume data loaded successfully."<<std::endl;
} else {
std::cout<<"Cannot load volume data."<<std::endl;
exit(EXIT_FAILURE);
}
//set background colour
glClearColor(bg.r, bg.g, bg.b, bg.a);
//setup unit cube vertex array and vertex buffer objects
glGenVertexArrays(1, &cubeVAOID);
glGenBuffers(1, &cubeVBOID);
glGenBuffers(1, &cubeIndicesID);
//unit cube vertices
glm::vec3 vertices[8]= { glm::vec3(-0.5f,-0.5f,-0.5f),
glm::vec3( 0.5f,-0.5f,-0.5f),
glm::vec3( 0.5f, 0.5f,-0.5f),
glm::vec3(-0.5f, 0.5f,-0.5f),
glm::vec3(-0.5f,-0.5f, 0.5f),
glm::vec3( 0.5f,-0.5f, 0.5f),
glm::vec3( 0.5f, 0.5f, 0.5f),
glm::vec3(-0.5f, 0.5f, 0.5f)
};
//unit cube indices
GLushort cubeIndices[36]= {0,5,4,
5,0,1,
3,7,6,
3,6,2,
7,4,6,
6,4,5,
2,1,3,
3,1,0,
3,0,7,
7,0,4,
6,5,2,
2,5,1
};
glBindVertexArray(cubeVAOID);
glBindBuffer (GL_ARRAY_BUFFER, cubeVBOID);
//pass cube vertices to buffer object memory
glBufferData (GL_ARRAY_BUFFER, sizeof(vertices), &(vertices[0].x), GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attributre array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,0,0);
//pass indices to element array buffer
glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, cubeIndicesID);
glBufferData (GL_ELEMENT_ARRAY_BUFFER, sizeof(cubeIndices), &cubeIndices[0], GL_STATIC_DRAW);
glBindVertexArray(0);
//enable depth test
glEnable(GL_DEPTH_TEST);
//set the over blending function
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
cout<<"Initialization successfull"<<endl;
}
//OpenGL initialization function
void OnInit() {
GL_CHECK_ERRORS
//initialize FBO
initFBO();
//generate hardwre query
glGenQueries(1, &queryId);
//create a uniform grid of size 20x20 in XZ plane
grid = new CGrid(20,20);
GL_CHECK_ERRORS
//generate the quad vertices
glm::vec2 quadVerts[4];
quadVerts[0] = glm::vec2(0,0);
quadVerts[1] = glm::vec2(1,0);
quadVerts[2] = glm::vec2(1,1);
quadVerts[3] = glm::vec2(0,1);
//generate quad indices
GLushort quadIndices[]={ 0,1,2,0,2,3};
//generate quad vertex array and vertex buffer objects
glGenVertexArrays(1, &quadVAOID);
glGenBuffers(1, &quadVBOID);
glGenBuffers(1, &quadIndicesID);
glBindVertexArray(quadVAOID);
glBindBuffer (GL_ARRAY_BUFFER, quadVBOID);
//pass quad vertices to buffer object memory
glBufferData (GL_ARRAY_BUFFER, sizeof(quadVerts), &quadVerts[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attribute array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE,0,0);
//pass the quad indices to the element array buffer
glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, quadIndicesID);
glBufferData (GL_ELEMENT_ARRAY_BUFFER, sizeof(quadIndices), &quadIndices[0], GL_STATIC_DRAW);
//setup unit cube vertex array and vertex buffer objects
glGenVertexArrays(1, &cubeVAOID);
glGenBuffers(1, &cubeVBOID);
glGenBuffers(1, &cubeIndicesID);
//unit cube vertices
glm::vec3 vertices[8]={ glm::vec3(-0.5f,-0.5f,-0.5f),
glm::vec3( 0.5f,-0.5f,-0.5f),
glm::vec3( 0.5f, 0.5f,-0.5f),
glm::vec3(-0.5f, 0.5f,-0.5f),
glm::vec3(-0.5f,-0.5f, 0.5f),
glm::vec3( 0.5f,-0.5f, 0.5f),
glm::vec3( 0.5f, 0.5f, 0.5f),
glm::vec3(-0.5f, 0.5f, 0.5f)};
//unit cube indices
GLushort cubeIndices[36]={0,5,4,
5,0,1,
3,7,6,
3,6,2,
7,4,6,
6,4,5,
2,1,3,
3,1,0,
3,0,7,
7,0,4,
6,5,2,
2,5,1};
glBindVertexArray(cubeVAOID);
glBindBuffer (GL_ARRAY_BUFFER, cubeVBOID);
//pass cube vertices to buffer object memory
glBufferData (GL_ARRAY_BUFFER, sizeof(vertices), &(vertices[0].x), GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attributre array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,0,0);
//pass cube indices to element array buffer
glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, cubeIndicesID);
glBufferData (GL_ELEMENT_ARRAY_BUFFER, sizeof(cubeIndices), &cubeIndices[0], GL_STATIC_DRAW);
glBindVertexArray(0);
//Load the cube shader
cubeShader.LoadFromFile(GL_VERTEX_SHADER, "shaders/cube_shader.vert");
cubeShader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/cube_shader.frag");
//compile and link the shader
cubeShader.CreateAndLinkProgram();
cubeShader.Use();
//add attributes and uniforms
cubeShader.AddAttribute("vVertex");
cubeShader.AddUniform("MVP");
cubeShader.AddUniform("vColor");
cubeShader.UnUse();
//Load the front to back peeling shader
frontPeelShader.LoadFromFile(GL_VERTEX_SHADER, "shaders/front_peel.vert");
frontPeelShader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/front_peel.frag");
//compile and link the shader
frontPeelShader.CreateAndLinkProgram();
frontPeelShader.Use();
//add attributes and uniforms
frontPeelShader.AddAttribute("vVertex");
frontPeelShader.AddUniform("MVP");
frontPeelShader.AddUniform("vColor");
frontPeelShader.AddUniform("depthTexture");
//pass constant uniforms at initialization
glUniform1i(frontPeelShader("depthTexture"), 0);
frontPeelShader.UnUse();
//Load the blending shader
blendShader.LoadFromFile(GL_VERTEX_SHADER, "shaders/blend.vert");
blendShader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/blend.frag");
//compile and link the shader
blendShader.CreateAndLinkProgram();
blendShader.Use();
//add attributes and uniforms
blendShader.AddAttribute("vVertex");
blendShader.AddUniform("tempTexture");
//pass constant uniforms at initialization
glUniform1i(blendShader("tempTexture"), 0);
blendShader.UnUse();
//Load the final shader
finalShader.LoadFromFile(GL_VERTEX_SHADER, "shaders/blend.vert");
finalShader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/final.frag");
//compile and link the shader
finalShader.CreateAndLinkProgram();
finalShader.Use();
//add attributes and uniforms
finalShader.AddAttribute("vVertex");
finalShader.AddUniform("colorTexture");
finalShader.AddUniform("vBackgroundColor");
//pass constant uniforms at initialization
glUniform1i(finalShader("colorTexture"), 0);
finalShader.UnUse();
cout<<"Initialization successfull"<<endl;
}
//OpenGL initialization
void OnInit() {
//load the cubemap shader
cubemapShader.LoadFromFile(GL_VERTEX_SHADER, "shaders/cubemap.vert");
cubemapShader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/cubemap.frag");
//compile and link shader
cubemapShader.CreateAndLinkProgram();
cubemapShader.Use();
//add shader attribute and uniforms
cubemapShader.AddAttribute("vVertex");
cubemapShader.AddAttribute("vNormal");
cubemapShader.AddUniform("MVP");
cubemapShader.AddUniform("eyePosition");
cubemapShader.AddUniform("cubeMap");
//set values of constant uniforms at initialization
glUniform1i(cubemapShader("cubeMap"), 1);
cubemapShader.UnUse();
GL_CHECK_ERRORS
//setup sphere geometry
createSphere(1,10,10);
GL_CHECK_ERRORS
//setup sphere vao and vbo stuff
glGenVertexArrays(1, &sphereVAOID);
glGenBuffers(1, &sphereVerticesVBO);
glGenBuffers(1, &sphereIndicesVBO);
glBindVertexArray(sphereVAOID);
glBindBuffer (GL_ARRAY_BUFFER, sphereVerticesVBO);
//pass vertices to the buffer object
glBufferData (GL_ARRAY_BUFFER, vertices.size()*sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attribute array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex),0);
GL_CHECK_ERRORS
//enable vertex attribute array for normal
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex), (const GLvoid*)(offsetof(Vertex, normal)));
GL_CHECK_ERRORS
//pass sphere indices to element array buffer
glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, sphereIndicesVBO);
glBufferData (GL_ELEMENT_ARRAY_BUFFER, indices.size()*sizeof(GLushort), &indices[0], GL_STATIC_DRAW);
//generate the dynamic cubemap texture and bind to texture unit 1
glGenTextures(1, &dynamicCubeMapID);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_CUBE_MAP, dynamicCubeMapID);
//set texture parameters
glTexParameterf(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
//for all 6 cubemap faces
for (int face = 0; face < 6; face++) {
//allocate a different texture for each face and assign to the cubemap texture target
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, 0, GL_RGBA, CUBEMAP_SIZE, CUBEMAP_SIZE, 0, GL_RGBA, GL_FLOAT, NULL);
}
GL_CHECK_ERRORS
//setup FBO
glGenFramebuffers(1, &fboID);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fboID);
//setup render buffer object (RBO)
glGenRenderbuffers(1, &rboID);
glBindRenderbuffer(GL_RENDERBUFFER, rboID);
//set the renderbuffer storage to have the same dimensions as the cubemap texture
//also set the renderbuffer as the depth attachment of the FBO
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, CUBEMAP_SIZE, CUBEMAP_SIZE);
glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fboID);
//set the dynamic cubemap texture as the colour attachment of FBO
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X, dynamicCubeMapID, 0);
//check the framebuffer completeness status
GLenum status = glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER);
if(status != GL_FRAMEBUFFER_COMPLETE) {
cerr<<"Frame buffer object setup error."<<endl;
exit(EXIT_FAILURE);
} else {
cerr<<"FBO setup successfully."<<endl;
}
//unbind FBO
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
//unbind renderbuffer
glBindRenderbuffer(GL_RENDERBUFFER, 0);
GL_CHECK_ERRORS
//create a grid object
grid = new CGrid();
//create a unit cube object
cube = new CUnitCube(glm::vec3(1,0,0));
GL_CHECK_ERRORS
//enable depth testing and back face culling
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
cout<<"Initialization successfull"<<endl;
}
//OpenGL initialization function
void OnInit() {
GL_CHECK_ERRORS
//create a uniform grid of size 20x20 in XZ plane
grid = new CGrid(20,20);
GL_CHECK_ERRORS
//create a new TetrahedraMarcher instance
marcher = new TetrahedraMarcher();
//set the volume dataset dimensions
marcher->SetVolumeDimensions(256,256,256);
//load the volume dataset
marcher->LoadVolume(volume_file);
//set the isosurface value
marcher->SetIsosurfaceValue(48);
//set the number of sampling voxels
marcher->SetNumSamplingVoxels(128,128,128);
//begin tetrahedra marching
marcher->MarchVolume();
//setup the volume marcher vertex array object and vertex buffer object
glGenVertexArrays(1, &volumeMarcherVAO);
glGenBuffers(1, &volumeMarcherVBO);
glBindVertexArray(volumeMarcherVAO);
glBindBuffer (GL_ARRAY_BUFFER, volumeMarcherVBO);
//pass the obtained vertices from the tetrahedra marcher and pass to the
//buffer object memory
glBufferData (GL_ARRAY_BUFFER, marcher->GetTotalVertices()*sizeof(Vertex), marcher->GetVertexPointer(), GL_STATIC_DRAW);
//enable vertex attribute array for position
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex),0);
//enable vertex attribute array for normals
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,sizeof(Vertex),(const GLvoid*)offsetof(Vertex, normal));
GL_CHECK_ERRORS
//load the shader
shader.LoadFromFile(GL_VERTEX_SHADER, "shaders/marcher.vert");
shader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/marcher.frag");
//compile and link the shader program
shader.CreateAndLinkProgram();
shader.Use();
//add attribute and uniform
shader.AddAttribute("vVertex");
shader.AddAttribute("vNormal");
shader.AddUniform("MVP");
shader.UnUse();
GL_CHECK_ERRORS
//set the background colour
glClearColor(bg.r, bg.g, bg.b, bg.a);
//enable depth test and culling
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
cout<<"Initialization successfull"<<endl;
}
//OpenGL initialization
void OnInit() {
GL_CHECK_ERRORS
//load shader
shader.LoadFromFile(GL_VERTEX_SHADER, "shaders/shader.vert");
shader.LoadFromFile(GL_FRAGMENT_SHADER, "shaders/shader.frag");
//compile and link shader
shader.CreateAndLinkProgram();
shader.Use();
//add attributes and uniforms
shader.AddAttribute("vVertex");
shader.AddUniform("textureMap");
//pass values of constant uniforms at initialization
glUniform1i(shader("textureMap"), 0);
shader.UnUse();
GL_CHECK_ERRORS
//setup quad geometry
//setup quad vertices
vertices[0] = glm::vec2(0.0,0.0);
vertices[1] = glm::vec2(1.0,0.0);
vertices[2] = glm::vec2(1.0,1.0);
vertices[3] = glm::vec2(0.0,1.0);
//fill quad indices array
GLushort* id=&indices[0];
*id++ =0;
*id++ =1;
*id++ =2;
*id++ =0;
*id++ =2;
*id++ =3;
GL_CHECK_ERRORS
//setup quad vao and vbo stuff
glGenVertexArrays(1, &vaoID);
glGenBuffers(1, &vboVerticesID);
glGenBuffers(1, &vboIndicesID);
glBindVertexArray(vaoID);
glBindBuffer (GL_ARRAY_BUFFER, vboVerticesID);
//pass quad vertices to buffer object
glBufferData (GL_ARRAY_BUFFER, sizeof(vertices), &vertices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//enable vertex attribute array for position
glEnableVertexAttribArray(shader["vVertex"]);
glVertexAttribPointer(shader["vVertex"], 2, GL_FLOAT, GL_FALSE,0,0);
GL_CHECK_ERRORS
//pass quad indices to element array buffer
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIndicesID);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), &indices[0], GL_STATIC_DRAW);
GL_CHECK_ERRORS
//load the image using SOIL
int texture_width = 0, texture_height = 0, channels=0;
GLubyte* pData = SOIL_load_image(filename.c_str(), &texture_width, &texture_height, &channels, SOIL_LOAD_AUTO);
if(pData == NULL) {
cerr<<"Cannot load image: "<<filename.c_str()<<endl;
exit(EXIT_FAILURE);
}
//vertically flip the image on Y axis since it is inverted
int i,j;
for( j = 0; j*2 < texture_height; ++j )
{
int index1 = j * texture_width * channels;
int index2 = (texture_height - 1 - j) * texture_width * channels;
for( i = texture_width * channels; i > 0; --i )
{
GLubyte temp = pData[index1];
pData[index1] = pData[index2];
pData[index2] = temp;
++index1;
++index2;
}
}
//setup OpenGL texture and bind to texture unit 0
glGenTextures(1, &textureID);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, textureID);
//set 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_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
//allocate texture
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, texture_width, texture_height, 0, GL_RGB, GL_UNSIGNED_BYTE, pData);
//free SOIL image data
SOIL_free_image_data(pData);
GL_CHECK_ERRORS
cout<<"Initialization successfull"<<endl;
}
void InitGL() {
glClearColor(1,1,1,1);
glGenQueries(1, &query);
glGenQueries(1, &t_query);
texture_size_x = numX+1;
texture_size_y = numY+1;
CHECK_GL_ERRORS
startTime = (float)glutGet(GLUT_ELAPSED_TIME);
// get ticks per second
QueryPerformanceFrequency(&frequency);
// start timer
QueryPerformanceCounter(&t1);
size_t i=0, j=0, count=0;
int l1=0, l2=0;
int v = numY+1;
int u = numX+1;
printf("Total triangles: %3d\n",numX*numY*2);
indices.resize( numX*numY*2*3);
X.resize(total_points);
X_last.resize(total_points);
F.resize(total_points);
//fill in positions
for(int j=0;j<=numY;j++) {
for(int i=0;i<=numX;i++) {
X[count] = glm::vec4( ((float(i)/(u-1)) *2-1)* hsize, sizeX+1, ((float(j)/(v-1) )* sizeY),1);
X_last[count] = X[count];
count++;
}
}
//fill in indices
GLushort* id=&indices[0];
for (int i = 0; i < numY; i++) {
for (int j = 0; j < numX; j++) {
int i0 = i * (numX+1) + j;
int i1 = i0 + 1;
int i2 = i0 + (numX+1);
int i3 = i2 + 1;
if ((j+i)%2) {
*id++ = i0; *id++ = i2; *id++ = i1;
*id++ = i1; *id++ = i2; *id++ = i3;
} else {
*id++ = i0; *id++ = i2; *id++ = i3;
*id++ = i0; *id++ = i3; *id++ = i1;
}
}
}
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glEnable(GL_CULL_FACE);
glEnable(GL_LINE_SMOOTH);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glCullFace(GL_BACK);
glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
//Disable vsync
wglSwapIntervalEXT(0);
// Setup springs
// Horizontal
for (l1 = 0; l1 < v; l1++) // v
for (l2 = 0; l2 < (u - 1); l2++) {
AddSpring((l1 * u) + l2,(l1 * u) + l2 + 1,KsStruct,KdStruct);
}
// Vertical
for (l1 = 0; l1 < (u); l1++)
for (l2 = 0; l2 < (v - 1); l2++) {
AddSpring((l2 * u) + l1,((l2 + 1) * u) + l1,KsStruct,KdStruct);
}
// Shearing Springs
for (l1 = 0; l1 < (v - 1); l1++)
for (l2 = 0; l2 < (u - 1); l2++) {
AddSpring((l1 * u) + l2,((l1 + 1) * u) + l2 + 1,KsShear,KdShear);
AddSpring(((l1 + 1) * u) + l2,(l1 * u) + l2 + 1,KsShear,KdShear);
}
// Bend Springs
for (l1 = 0; l1 < (v); l1++) {
for (l2 = 0; l2 < (u - 2); l2++) {
AddSpring((l1 * u) + l2,(l1 * u) + l2 + 2,KsBend,KdBend);
}
AddSpring((l1 * u) + (u - 3),(l1 * u) + (u - 1),KsBend,KdBend);
}
for (l1 = 0; l1 < (u); l1++) {
for (l2 = 0; l2 < (v - 2); l2++) {
AddSpring((l2 * u) + l1,((l2 + 2) * u) + l1,KsBend,KdBend);
}
AddSpring(((v - 3) * u) + l1,((v - 1) * u) + l1,KsBend,KdBend);
}
massSpringShader.LoadFromFile(GL_VERTEX_SHADER, "shaders/Spring.vp");
particleShader.LoadFromFile(GL_VERTEX_SHADER,"shaders/Basic.vp");
particleShader.LoadFromFile(GL_FRAGMENT_SHADER,"shaders/Basic.fp");
renderShader.LoadFromFile(GL_VERTEX_SHADER,"shaders/Passthrough.vp");
renderShader.LoadFromFile(GL_FRAGMENT_SHADER,"shaders/Passthrough.fp");
massSpringShader.CreateAndLinkProgram();
massSpringShader.Use();
massSpringShader.AddAttribute("position_mass");
massSpringShader.AddAttribute("prev_position");
massSpringShader.AddUniform("tex_position_mass");
massSpringShader.AddUniform("tex_pre_position_mass");
massSpringShader.AddUniform("MVP");
massSpringShader.AddUniform("dt");
massSpringShader.AddUniform("gravity");
massSpringShader.AddUniform("ksStr");
massSpringShader.AddUniform("ksShr");
massSpringShader.AddUniform("ksBnd");
massSpringShader.AddUniform("kdStr");
massSpringShader.AddUniform("kdShr");
massSpringShader.AddUniform("kdBnd");
massSpringShader.AddUniform("DEFAULT_DAMPING");
massSpringShader.AddUniform("texsize_x");
massSpringShader.AddUniform("texsize_y");
massSpringShader.AddUniform("step");
massSpringShader.AddUniform("inv_cloth_size");
massSpringShader.AddUniform("ellipsoid");
glUniform1i(massSpringShader("tex_position_mass"), 0);
glUniform1i(massSpringShader("tex_pre_position_mass"), 1);
massSpringShader.UnUse();
CHECK_GL_ERRORS
particleShader.CreateAndLinkProgram();
particleShader.Use();
particleShader.AddAttribute("position_mass");
particleShader.AddUniform("pointSize");
particleShader.AddUniform("MV");
particleShader.AddUniform("MVP");
particleShader.AddUniform("vColor");
particleShader.AddUniform("selected_index");
glUniform1f(particleShader("pointSize"), pointSize);
glUniform4fv(particleShader("vColor"),1, vRed);
particleShader.UnUse();
renderShader.CreateAndLinkProgram();
renderShader.Use();
renderShader.AddAttribute("position_mass");
renderShader.AddUniform("MVP");
renderShader.AddUniform("vColor");
glUniform4fv(renderShader("vColor"),1, vGray);
renderShader.UnUse();
CHECK_GL_ERRORS
//create vbo
createVBO();
//setup transform feedback attributes
glGenTransformFeedbacks(1, &tfID);
glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, tfID);
const char* varying_names[]={"out_position_mass", "out_prev_position"};
glTransformFeedbackVaryings(massSpringShader.GetProgram(), 2, varying_names, GL_SEPARATE_ATTRIBS);
glLinkProgram(massSpringShader.GetProgram());
}
//display callback function
void OnRender() {
//increment the radius
radius+=dx;
//if radius is beyond limits, invert the movement direction
if(radius<1 || radius>5)
dx=-dx;
GL_CHECK_ERRORS
//clear colour buffer
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the camera transform
glm::mat4 T = glm::translate(glm::mat4(1.0f),glm::vec3(0.0f, 0.0f, dist));
glm::mat4 Rx = glm::rotate(T, rX, glm::vec3(1.0f, 0.0f, 0.0f));
glm::mat4 MV = glm::rotate(Rx, rY, glm::vec3(0.0f, 1.0f, 0.0f));
//get the eye position
eyePos.x = -(MV[0][0] * MV[3][0] + MV[0][1] * MV[3][1] + MV[0][2] * MV[3][2]);
eyePos.y = -(MV[1][0] * MV[3][0] + MV[1][1] * MV[3][1] + MV[1][2] * MV[3][2]);
eyePos.z = -(MV[2][0] * MV[3][0] + MV[2][1] * MV[3][1] + MV[2][2] * MV[3][2]);
//p is to translate the sphere to bring it to the ground level
glm::vec3 p=glm::vec3(0,1,0);
//when rendering to the CUBEMAP texture, we move all of cubes by opposite amount
//so that the projection is clearly visible
T = glm::translate(glm::mat4(1), -p);
//set the viewport to the size of the cube map texture
glViewport(0,0,CUBEMAP_SIZE,CUBEMAP_SIZE);
//bind the FBO
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fboID);
//set the GL_TEXTURE_CUBE_MAP_POSITIVE_X to the colour attachment of FBO
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X, dynamicCubeMapID, 0);
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the virtual viewrer at the reflective object center and render the scene
//using the cube map projection matrix and appropriate viewing settings
glm::mat4 MV1 = glm::lookAt(glm::vec3(0),glm::vec3(1,0,0), glm::vec3(0,-1,0));
DrawScene( MV1*T, Pcubemap);
//set the GL_TEXTURE_CUBE_MAP_NEGATIVE_X to the colour attachment of FBO
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, dynamicCubeMapID, 0);
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the virtual viewrer at the reflective object center and render the scene
//using the cube map projection matrix and appropriate viewing settings
glm::mat4 MV2 = glm::lookAt(glm::vec3(0),glm::vec3(-1,0,0), glm::vec3(0,-1,0));
DrawScene( MV2*T, Pcubemap);
//set the GL_TEXTURE_CUBE_MAP_POSITIVE_Y to the colour attachment of FBO
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, dynamicCubeMapID, 0);
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the virtual viewrer at the reflective object center and render the scene
//using the cube map projection matrix and appropriate viewing settings
glm::mat4 MV3 = glm::lookAt(glm::vec3(0),glm::vec3(0,1,0), glm::vec3(1,0,0));
DrawScene( MV3*T, Pcubemap);
//set the GL_TEXTURE_CUBE_MAP_NEGATIVE_Y to the colour attachment of FBO
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, dynamicCubeMapID, 0);
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the virtual viewrer at the reflective object center and render the scene
//using the cube map projection matrix and appropriate viewing settings
glm::mat4 MV4 = glm::lookAt(glm::vec3(0),glm::vec3(0,-1,0), glm::vec3(1,0,0));
DrawScene( MV4*T, Pcubemap);
//set the GL_TEXTURE_CUBE_MAP_POSITIVE_Z to the colour attachment of FBO
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, dynamicCubeMapID, 0);
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the virtual viewrer at the reflective object center and render the scene
//using the cube map projection matrix and appropriate viewing settings
glm::mat4 MV5 = glm::lookAt(glm::vec3(0),glm::vec3(0,0,1), glm::vec3(0,-1,0));
DrawScene(MV5*T, Pcubemap);
//set the GL_TEXTURE_CUBE_MAP_NEGATIVE_Z to the colour attachment of FBO
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, dynamicCubeMapID, 0);
//clear the colour and depth buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//set the virtual viewrer at the reflective object center and render the scene
//using the cube map projection matrix and appropriate viewing settings
glm::mat4 MV6 = glm::lookAt(glm::vec3(0),glm::vec3(0,0,-1), glm::vec3(0,-1,0));
DrawScene( MV6*T, Pcubemap);
//unbind the FBO
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
//reset the default viewport
glViewport(0,0,WIDTH,HEIGHT);
//render scene from the camera point of view and projection matrix
DrawScene(MV, P);
//bind the sphere vertex array object
glBindVertexArray(sphereVAOID);
//use the cubemap shader to render the reflective sphere
cubemapShader.Use();
//set the sphere transform
T = glm::translate(glm::mat4(1), p);
//set the shader uniforms
glUniformMatrix4fv(cubemapShader("MVP"), 1, GL_FALSE, glm::value_ptr(P*(MV*T)));
glUniform3fv(cubemapShader("eyePosition"), 1, glm::value_ptr(eyePos));
//draw the sphere triangles
glDrawElements(GL_TRIANGLES,indices.size(),GL_UNSIGNED_SHORT,0);
//unbind shader
cubemapShader.UnUse();
//swap front and back buffers to show the rendered result
glutSwapBuffers();
}
void RenderGPU_TF() {
massSpringShader.Use();
glUniformMatrix4fv(massSpringShader("MVP"), 1, GL_FALSE, glm::value_ptr(mMVP));
glUniform1f(massSpringShader("dt"), timeStep);
glUniform3fv(massSpringShader("gravity"),1,&gravity.x);
glUniform1f(massSpringShader("ksStr"), KsStruct);
glUniform1f(massSpringShader("ksShr"), KsShear);
glUniform1f(massSpringShader("ksBnd"), KsBend);
glUniform1f(massSpringShader("kdStr"), KdStruct/1000.0f);
glUniform1f(massSpringShader("kdShr"), KdShear/1000.0f);
glUniform1f(massSpringShader("kdBnd"), KdBend/1000.0f);
glUniform1f(massSpringShader("DEFAULT_DAMPING"), DEFAULT_DAMPING);
glUniform1i(massSpringShader("texsize_x"),texture_size_x);
glUniform1i(massSpringShader("texsize_y"),texture_size_y);
glUniform2f(massSpringShader("inv_cloth_size"),float(sizeX)/numX,float(sizeY)/numY);
glUniform2f(massSpringShader("step"),1.0f/(texture_size_x-1.0f),1.0f/(texture_size_y-1.0f));
for(int i=0;i<NUM_ITER;i++) {
glActiveTexture( GL_TEXTURE0);
glBindTexture( GL_TEXTURE_BUFFER, texPosID[writeID]);
glActiveTexture( GL_TEXTURE1);
glBindTexture( GL_TEXTURE_BUFFER, texPrePosID[writeID]);
glBindVertexArray( vaoUpdateID[writeID]);
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, vboID_Pos[readID]);
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 1, vboID_PrePos[readID]);
glEnable(GL_RASTERIZER_DISCARD); // disable rasterization
glBeginQuery(GL_TIME_ELAPSED,t_query);
glBeginTransformFeedback(GL_POINTS);
glDrawArrays(GL_POINTS, 0, total_points);
glEndTransformFeedback();
glEndQuery(GL_TIME_ELAPSED);
glFlush();
glDisable(GL_RASTERIZER_DISCARD);
int tmp = readID;
readID=writeID;
writeID = tmp;
}
// get the query result
glGetQueryObjectui64v(t_query, GL_QUERY_RESULT, &elapsed_time);
delta_time = elapsed_time / 1000000.0f;
massSpringShader.UnUse();
CHECK_GL_ERRORS;
glBindVertexArray(vaoRenderID[writeID]);
glDisable(GL_DEPTH_TEST);
renderShader.Use();
glUniformMatrix4fv(renderShader("MVP"), 1, GL_FALSE, glm::value_ptr(mMVP));
glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_SHORT,0);
renderShader.UnUse();
glEnable(GL_DEPTH_TEST);
if(bDisplayMasses) {
particleShader.Use();
glUniform1i(particleShader("selected_index"), selected_index);
glUniformMatrix4fv(particleShader("MV"), 1, GL_FALSE, glm::value_ptr(mMV));
glUniformMatrix4fv(particleShader("MVP"), 1, GL_FALSE, glm::value_ptr(mMVP));
//draw the masses last
glDrawArrays(GL_POINTS, 0, total_points);
//glDrawTransformFeedbackStream(GL_POINTS, tfID, 0);
particleShader.UnUse();
}
glBindVertexArray( 0);
CHECK_GL_ERRORS
}
