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render to single-channel float texture

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Hi! I need to render to a texture with one float16-value per texel. I already succesfully set up a framebuffer object and a GL_RGB_FLOAT16_ATI texture and it works fine. If, however, I set up a GL_INTENSITY_FLOAT16_ATI as render target, i get an error when I check the framebuffer status. Now I have two questions: 1.) Is it correct that a texture with format GL_INTENSITY uses a third of the memory of a GL_RGB texture? 2.) Is it possible to use a GL_INTENSITY texture as a render target via framebuffer object? If so, how? thx alot christian

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