glblendequationext man page on SunOS

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GLBLENDEQUATIONEXT(3GL)				       GLBLENDEQUATIONEXT(3GL)

NAME
       glBlendEquationEXT - specify the blend equation

C SPECIFICATION
       void glBlendEquationEXT(GLenum mode)

PARAMETERS
       mode  Specify  the  equation  for blending. The following symbolic con‐
	     stants  are  accepted:   GL_FUNC_ADD_EXT,	 GL_FUNC_SUBTRACT_EXT,
	     GL_FUNC_REVERSE_SUBTRACT_EXT, GL_MIN_EXT, and GL_MAX_EXT.

DESCRIPTION
       glBlendEquationEXT  specifies  the  equation  for blending color compo‐
       nents.  The blending equations are as follows:

       GL_FUNC_ADD_EXT:	 C = (Cs * S) + (Cd * D)

       GL_FUNC_MIN_EXT:	 C = min (Cs, Cd)

       GL_FUNC_MAX_EXT:	 C = max (Cs, Cd)

       GL_FUNC_SUBTRACT_EXT:  C = (Cs * S) - (Cd * D)

       GL_FUNC_REVERSE_SUBTRACT_EXT:  C = (Cd * D) - (Cs * S)

       GL_LOGIC_OP:  C = Cs OP Cd

       where:
		Cs = source color components
		Cd = destination color components
		S  = source blending factors
		D  = destination blending factors

       In all cases the blending equation is  evaluated	 separately  for  each
       color  component.  See  glBlendFunc  for	 a complete description of the
       blending operations.

NOTES
       glBlendEquationEXT is part of the EXT_blend_minmax extension, not  part
       of  the core GL command set.  If GL_EXT_blend_minmax is included in the
       string returned by glGetString, when  called  with  argument  GL_EXTEN‐
       SIONS, extension EXT_blend_minmax is supported by the connection.

       glBlendEquationEXT  is  part  of	 the EXT_blend_logic_op extension.  If
       GL_EXT_blend_logic_op  and  GL_EXT_blend_minmax	are  included  in  the
       string  returned	 by  glGetString,  when called with argument GL_EXTEN‐
       SIONS, extension GL_EXT_blend_logic_op  and  EXT_blend_minmax  is  sup‐
       ported by the connection.

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

ASSOCIATED GETS
       glGet with an argument of GL_BLEND_EQUATION_EXT

SEE ALSO
       glBlendFunc, glBlendColorEXT, glGetString

				   13 May 99	       GLBLENDEQUATIONEXT(3GL)
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