glBlendingColor
Sets blending constant color for BlendingFactorFunction.CONSTANT_COLOR, BlendingFactorFunction.ONE_MINUS_CONSTANT_COLOR, BlendingFactorFunction.CONSTANT_ALPHA and BlendingFactorFunction.ONE_MINUS_CONSTANT_ALPHA.
Sets blending constant color for BlendingFactorFunction.CONSTANT_COLOR, BlendingFactorFunction.ONE_MINUS_CONSTANT_COLOR, BlendingFactorFunction.CONSTANT_ALPHA and BlendingFactorFunction.ONE_MINUS_CONSTANT_ALPHA.