int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH);
glutInitWindowPosition(100,100);
glutInitWindowSize(RENDER_WIDTH,RENDER_HEIGHT);
glutCreateWindow("GLSL Shadow mapping");
// This call will grab openGL extension function pointers.
// This is not necessary for macosx and linux
#ifdef _WIN32
getOpenGLFunctionPointers();
#endif
generateShadowFBO();
loadShadowShader();
// This is important, if not here, FBO's depthbuffer won't be populated.
glEnable(GL_DEPTH_TEST);
glClearColor(0,0,0,1.0f);
glEnable(GL_CULL_FACE);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
glutDisplayFunc(renderScene);
glutIdleFunc(renderScene);
glutKeyboardFunc(processNormalKeys);
glutMainLoop();
}
SDL_RenderTarget* Create_pBuffer(unsigned int width, unsigned int height){
printf("Create_pBuffer(%ud,%ud);\n",width,height);
#ifdef _WIN32
if (!windowsOpenGLInitialized){
getOpenGLFunctionPointers();
windowsOpenGLInitialized=1;
}
#elif defined(__linux__)
initializeGLEW();
#endif
GLuint textureId;
glGenTextures(1, &textureId);
glBindTexture(GL_TEXTURE_2D, textureId);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_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_GENERATE_MIPMAP, GL_TRUE); // automatic mipmap
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0,GL_RGBA, GL_UNSIGNED_BYTE, 0);
// create a framebuffer object
GLuint fboId;
glGenFramebuffers(1, &fboId);
glBindFramebuffer(GL_FRAMEBUFFER, fboId);
// attach the texture to FBO color attachment point
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,GL_TEXTURE_2D, textureId, 0);
int attachError = glGetError();
if (attachError != GL_NO_ERROR){
switch(attachError){
printf("error in glFramebufferTexture2D.\n");
}
}
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if(status != GL_FRAMEBUFFER_COMPLETE){
printf("An error occured creating the pBuffer.\n");
switch (status)
{
case GL_FRAMEBUFFER_UNDEFINED : printf("GL_FRAMEBUFFER_UNDEFINED \n"); break ;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT : printf("GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT \n"); break ;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT : printf("GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT \n"); break ;
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER : printf("GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER \n"); break ;
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER : printf("GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER \n"); break ;
case GL_FRAMEBUFFER_UNSUPPORTED : printf("GL_FRAMEBUFFER_UNSUPPORTED \n"); break ;
case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE : printf("GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE \n"); break ;
//case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE : printf("GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE \n"); break ;
//case GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS : printf("GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS \n"); break ;
default: printf("error code unknow: %d",status);
}
}
renderBuffers[renderBuffersCounter].fboID = fboId;
renderBuffers[renderBuffersCounter].textureID = textureId;
renderBuffers[renderBuffersCounter].w = width;
renderBuffers[renderBuffersCounter].h = height;
renderBuffers[renderBuffersCounter].id = renderBuffersCounter;
renderBuffersCounter++;
glBindFramebuffer(GL_FRAMEBUFFER, 0);
printf("pBuffer created ID= %d.\n",renderBuffers[renderBuffersCounter-1].id);
return &renderBuffers[renderBuffersCounter-1].id;
}
