void setupCameraAlter(ShaderProgram * sp, const Camera * camera)
{
/* Pointers */
GLint rotP, viewPosP;
/* Matrices */
mat4 rotMatrix;
setMatrixFromQuaternion(rotMatrix, camera->q);
transposeMatrix(rotMatrix);
glUseProgram(sp->p);
rotP = glGetUniformLocation(sp->p, "transform.rot");
/* TODO: if (rotP == -1) {} */
glUniformMatrix4fv(rotP, 1, GL_TRUE, rotMatrix);
viewPosP = glGetUniformLocation(sp->p, "transform.viewPosition");
/* TODO: if (viewPosP == -1) {} */
glUniform3fv(viewPosP, 1, camera->pos);
#ifdef DEBUG
validateShaderProgram(sp->p);
#endif
CHECK_OPENGL_ERRORS(__FILE__, __LINE__);
}
void checkOpenGLVersion()
{
GLenum glewInitValue;
/* For compatinility with OpenGL 3.2+ core context. */
glewExperimental = GL_TRUE;
glewInitValue = glewInit();
/* Avoid GLEW errors, see LINKS: [10]. */
glGetError();
if (glewInitValue != GLEW_OK)
{
fprintf(stderr, "glewInit failed: %s\n.",
glewGetErrorString(glewInitValue));
exit(EXIT_FAILURE);
}
if (! glewIsSupported("GL_VERSION_3_3"))
{
fprintf(stderr, "No OpenGL 3.3 support. I'm sorry.\n");
fprintf(stderr, "Your OpenGL version: %s.\n",
glGetString(GL_VERSION));
exit(EXIT_FAILURE);
}
CHECK_OPENGL_ERRORS(__FILE__, __LINE__);
}
void setupOpenGLContext(ContextSize * context)
{
if (glfwInit() == GL_FALSE)
{
fprintf(stderr, "glfwInit failed.\n");
exit(EXIT_FAILURE);
}
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
context->window = glfwCreateWindow(
context->w, context->h,
"Wave Simulation", /* window title */
NULL, /* NULL to use windowed mode */
NULL); /* NULL to not share resources with other windows */
if (context->window == GL_FALSE)
{
fprintf(stderr, "glfwOpenWindow failed.\n");
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(context->window);
CHECK_OPENGL_ERRORS(__FILE__, __LINE__);
}
Crosshair::Crosshair(int screenWidth, int screenHeight) {
this->centerX = (float)screenWidth / 2;
this->centerY = (float)screenHeight / 2;
this->crosshair = glGenLists(1);
CHECK_OPENGL_ERRORS(__LINE__);
assert(this->crosshair != 0);
glNewList(this->crosshair, GL_COMPILE);
this->draw();
glEndList();
}
void setupOpenGLState(ContextSize * context, GLboolean vsync)
{
if (vsync)
{
glfwSwapInterval(1);
}
else
{
glfwSwapInterval(0);
}
glViewport(0, 0, context->w, context->h);
glClearColor(0.0f, 0.20f, 0.40f, 1.0f);
#if 0
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
#endif
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glDepthRange(0.0f, 1.0f);
/* No interpolate 'flat' varying variables, i.e. normals. */
glProvokingVertex(GL_FIRST_VERTEX_CONVENTION);
/* Perform some rendering with near and far planes clipping off. */
/* I use small znear value instead, that work better. */
/* glEnable(GL_DEPTH_CLAMP); */
/* For correct bilinear interpolation at rib of skybox. */
/* TODO: glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);*/
#if 0
glEnable(GL_POINT_SMOOTH);
glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
glEnable(GL_LINE_SMOOTH);
glLineWidth(1.0f);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
glEnable(GL_POLYGON_SMOOTH);
glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
#endif
CHECK_OPENGL_ERRORS(__FILE__, __LINE__);
}
void setupCamera(ShaderProgram * sp, const Camera * camera)
{
/* Pointers */
GLint viewProjP, viewPosP;
/* Matrices */
mat4 viewTrMatrix, viewRotMatrix, viewMatrix;
mat4 projMatrix, viewProjMatrix;
setPerspectiveMatrix(projMatrix,
camera->viewAngleY,
camera->aspect,
camera->znear,
camera->zfar);
setMatrixFromQuaternion(viewRotMatrix, camera->q);
setTranslationMatrix(viewTrMatrix,
-camera->pos[0],
-camera->pos[1],
-camera->pos[2]);
setMulMatrix(viewMatrix, viewRotMatrix, viewTrMatrix);
setMulMatrix(viewProjMatrix, projMatrix, viewMatrix);
glUseProgram(sp->p);
viewProjP = glGetUniformLocation(sp->p, "transform.viewProjection");
/* TODO: if (viewProjP == -1) {} */
glUniformMatrix4fv(viewProjP, 1, GL_TRUE, viewProjMatrix);
viewPosP = glGetUniformLocation(sp->p, "transform.viewPosition");
/* TODO: if (viewPosP == -1) {} */
glUniform3fv(viewPosP, 1, camera->pos);
#ifdef DEBUG
validateShaderProgram(sp->p);
#endif
CHECK_OPENGL_ERRORS(__FILE__, __LINE__);
}
GLuint createTextureFromTga(const char * path)
{
long length;
char * buffer = getTextFileContent(path, &length);
const TgaHeader * header = (TgaHeader *) buffer;
GLint format;
GLint internalFormat;
GLuint texture;
const GLvoid * imgData;
if (buffer == NULL)
{
return 0;
}
if (length <= (signed long) sizeof(TgaHeader))
{
fprintf(stderr, "Too small TGA file: %s\n", path);
free(buffer);
return 0;
}
if (header->datatype != 2 ||
(header->bitperpel != 24 && header->bitperpel != 32))
{
fprintf(stderr, "Wrong TGA file format: %s\n", path);
free(buffer);
return 0;
}
format = (header->bitperpel == 24 ? GL_BGR : GL_BGRA);
internalFormat = (format == GL_BGR ? GL_RGB8 : GL_RGBA8);
imgData = (const GLvoid *)
(buffer + sizeof(TgaHeader) + header->idlength);
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
/* Set 1-byte alignment (for non (2^n)x(2^n) size textures). */
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat,
header->width, header->height, 0, format,
GL_UNSIGNED_BYTE, imgData);
free(buffer);
#if 0
/* Linear filtering */
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_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);*/
#else
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
#endif
#if 0
/* No wrap */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#else
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
#endif
CHECK_OPENGL_ERRORS(__FILE__, __LINE__);
return texture;
}