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texenv with a single color component?

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I have a bunch of large grayscale textures so I figured I might as well store four of them at a time in a single texture, but I can''t find anything that will let me take out a single color component with the same method as the GL_ARB_texture_env_combine extension. Isn''t there anything I can use?

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If you dont use pixel shaders i dont think you can. Maybe with glColorMask.





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