glBlendColor man page on OpenBSD

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GLBLENDCOLOR(3G)					      GLBLENDCOLOR(3G)

NAME
       glBlendColor - set the blend color

C SPECIFICATION
       void glBlendColor( GLclampf red,
	    GLclampf green,
	    GLclampf blue,
	    GLclampf alpha )

       delim $$

PARAMETERS
       red, green, blue, alpha
	      specify the components of GL_BLEND_COLOR

DESCRIPTION
       The GL_BLEND_COLOR may be used to calculate the source and destination
       blending factors. The color components are clamped to the range [0, 1]
       before being stored. See glBlendFunc for a complete description of the
       blending operations.  Initially the GL_BLEND_COLOR is set to (0, 0, 0,
       0).

NOTES
       glBlendColor is part of the GL_ARB_imaging subset. glBlendColor is
       present only if GL_ARB_imaging is returned when glGetString is called
       with GL_EXTENSIONS as its argument.

ERRORS
       GL_INVALID_OPERATION is generated if glBlendColor is executed between
       the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS
       glGet with an argument of GL_BLEND_COLOR

SEE ALSO
       glBlendEquation(3G), glBlendFunc(3G), glGetString(3G)

								 March 1, 2011
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