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choffstein

OpenGL glClearColor Alpha Value

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Quick question that should be easy for you openGL gurus -- What does the alpha value in glClearColor do, and how will it effect my drawing? Thanks.

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glClearColor specifies the values used when the colour buffer is cleared.

If the alpha value was set to 0 it would be completely transparent, but if it was set to 1 it would be opaque. There's not much use to the alpha value unless you use special effects such as translucency, so it's best to set it to 1.0 if you don't.

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It gives the framebuffer an alpha value. So you can use it with say, GL_DST_ALPHA in glBlendFunc

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