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OpenGL Retrieving image data from OpenGL texture?

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I'm very familiar with loading .tga's, but less so with saving them... I'm good up until the last part, the saving of the image data. How can I get the image data from GL using the texture's ID so that I can write it to the file? Is this even possible? Anyways, thanks for reading, and I appreciate your time! :]

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You are looking for the glGetTexImage function. Something like this should work:


GLint width, height;
char *data;

glBindTexture(GL_TEXTURE_2D, your_texture_id);

glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);

data = malloc(width*height*4);

glGetTexImage(GL_TEXTURE_2D, 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, data);



data should now contain the image data. Already in the format you need for saving it in a 32 bit uncompressed TGA file. Don't forget to free() it. ;)

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