GLuint gl4::TextureManager::_loadTextureFromTGA(const char *filename) {
GLuint textureID = 0;
GLFWimage img;
if(!glfwReadImage(filename, &img, GLFW_NO_RESCALE_BIT))
std::cerr << " Failed to load texture from TGA file." << std::endl;
glGenTextures(1, &textureID);
glActiveTexture(GL_TEXTURE0);
glBindTexture( GL_TEXTURE_2D, textureID );
glfwLoadTextureImage2D( &img, 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 );
glfwFreeImage(&img); // Clean up the malloc()'ed data pointer
return textureID;
}
/*
* loadDistTexture - load 8-bit distance texture data
* from a TGA file and set up the corresponding texture object.
*/
void loadDistTexture(char *filename, GLuint texID, int *texw, int *texh) {
GLFWimage teximg; // Use intermediate GLFWimage to get width and height
if(!glfwReadImage(filename, &teximg, GLFW_NO_RESCALE_BIT))
printError("I/O error", "Failed to load distance texture from TGA file.");
*texw = teximg.Width;
*texh = teximg.Height;
glActiveTextureARB(GL_TEXTURE0);
glBindTexture( GL_TEXTURE_2D, texID );
glfwLoadTextureImage2D( &teximg, 0 );
// The special shader used to render this texture performs its own minification
// and magnification. Specify nearest neighbor sampling to avoid trampling
// over the distance values split over two channels as 8.8 fixed-point data.
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 );
glfwFreeImage(&teximg); // Clean up the malloc()'ed data pointer
}
Material CGraphicsModule::loadMaterial(const char *matName) {
Material material = materials[matName];
if (material.mat) {
return useMaterial(matName);
}
GLuint textureID;
glGenTextures( 1, &textureID );
GLFWimage teximg; // Use intermediate GLFWimage to get width and height
if(!glfwReadImage(matName, &teximg, GLFW_NO_RESCALE_BIT))
printf("I/O error %s", "Failed to load distance texture from TGA file.");
glActiveTexture(GL_TEXTURE0);
glBindTexture( GL_TEXTURE_2D, textureID );
glfwLoadTextureImage2D( &teximg, 0 );
unsigned int width = teximg.Width, height = teximg.Height;
// The special shader used to render this texture performs its own minification
// and magnification. Specify nearest neighbor sampling to avoid trampling
// over the distance values split over two channels as 8.8 fixed-point data.
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 );
glfwFreeImage(&teximg); // Clean up the malloc()'ed data pointer
Material ret = { (unsigned int)textureID, width, height };
materials[matName] = ret;
return ret;
}
