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ARB_texture_float and AlphaTest

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Hello, is it possible with the fixed function pipeline to use a floating point texture (GL_ARB_texture_float), render some overlapping quads with this texture to a FBO, render the FBO to a fullscreen quad and perform an alpha test on the rendered fbo? I think this should be no problem with a shader, but I haven't used GLSL before. And I want to avoid the complexity of them, if it's possible without.

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It should work because the texture samplers and alkpha test stage are separate entities in the graphics pipeline.
It doesn't matter if you use fixed function or shaders.

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