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Using RGB for A in fixed pipeline opengl

Yes so short question: Is it possible to use any of the RGB components as alpha in Opengl ES 1.1 (fixed pipeline)?

It seems that GL_COMBINE does not allow one to use the 开发者_运维问答RGB as a source for alpha.

Why is this limit imposed, and what are alternatives? I've tried quite a few things but I am unable to find a solution.

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