Many OpenGL through the mixed-effects (Blending) to be completed, mixed, there is the color of the screen with the new synthetic color. As synthetic methods, depending on the color of the Alpha value, and/or the blending function used. Alpha value is the color of the first four components, in the past is GL_RGB you use three color components to specify a color, now you can use to increase GL_RGBA an Alpha value of the

test.cpp

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