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Alpha channel - Please help

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How can i create an alpha channel so i can have a different value of alpha and texture on each pixel? I have a texture with two planes 1 for texture and 1 for alpha values. OpenGl - c++/c Thanks:-)

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you need to create an actual image that contains an alpha channel. Then when loading, specify GL_RGBA when creating the texture. You also need to enable alpha blending with the correct blending function.

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