public static void glBlendColor(float r, float g, float b, float a)
    {
        checkContextCompatibility();
        nglBlendColor(r, g, b, a);
    }
public static void glBlendColor ( float r , float g , float b , float a ) { checkContextCompatibility ( ) ; nglBlendColor ( r , g , b , a ) ; }
The {@link #GL_BLEND_COLOR} may be used to calculate the source and destination blending factors. The color
components are clamped to the range {@code [0,1]} before being stored. See {@link #glBlendFunc(int, int)} for a
complete description of the blending operations. Initially the {@link #GL_BLEND_COLOR} is set to {@code (0, 0, 0,
0)}.

@param r Specifies the red component of {@link #GL_BLEND_COLOR}.
@param g Specifies the green component of {@link #GL_BLEND_COLOR}.
@param b Specifies the blue component of {@link #GL_BLEND_COLOR}.
@param a Specifies the alpha component of {@link #GL_BLEND_COLOR}.