glLogicOp man page on MacOSX

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GLLOGICOP(3G)							 GLLOGICOP(3G)

NAME
       glLogicOp - specify a logical pixel operation for color index rendering

C SPECIFICATION
       void glLogicOp( GLenum opcode )

PARAMETERS
       opcode  Specifies a symbolic constant that selects a logical operation.
	       The following symbols are accepted: GL_CLEAR, GL_SET,  GL_COPY,
	       GL_COPY_INVERTED,  GL_NOOP,  GL_INVERT, GL_AND, GL_NAND, GL_OR,
	       GL_NOR,	GL_XOR,	 GL_EQUIV,  GL_AND_REVERSE,   GL_AND_INVERTED,
	       GL_OR_REVERSE,	and   GL_OR_INVERTED.  The  initial  value  is
	       GL_COPY.

DESCRIPTION
       glLogicOp specifies a logical operation that, when enabled, is  applied
       between	the  incoming color index or RGBA color and the color index or
       RGBA color at the corresponding	location  in  the  frame  buffer.   To
       enable  or  disable  the logical operation, call glEnable and glDisable
       using  the  symbolic  constant  GL_COLOR_LOGIC_OP  for  RGBA  mode   or
       GL_INDEX_LOGIC_OP  for  color index mode. The initial value is disabled
       for both operations.

	Opcode		   Resulting Operation
	GL_CLEAR	   0
	GL_SET		   1
	GL_COPY		   s
	GL_COPY_INVERTED   ~s
	GL_NOOP		   d
	GL_INVERT	   ~d
	GL_AND		   s & d
	GL_NAND		   ~(s & d)
	GL_OR		   s | d
	GL_NOR		   ~(s | d)
	GL_XOR		   s ^ d
	GL_EQUIV	   ~(s ^ d)
	GL_AND_REVERSE	   s & ~d
	GL_AND_INVERTED	   ~s & d
	GL_OR_REVERSE	   s | ~d
	GL_OR_INVERTED	   ~s | d

       opcode is a symbolic constant chosen  from  the	list  above.   In  the
       explanation  of the logical operations, s represents the incoming color
       index and d represents the index in the frame buffer.  Standard	C-lan‐
       guage operators are used.  As these bitwise operators suggest, the log‐
       ical operation is applied independently to each bit pair of the	source
       and destination indices or colors.

NOTES
       Color index logical operations are always supported. RGBA logical oper‐
       ations are supported only if the GL version is 1.1 or greater.

       When more than one RGBA color or index buffer is enabled	 for  drawing,
       logical	operations  are	 performed separately for each enabled buffer,
       using for the destination  value	 the  contents	of  that  buffer  (see
       glDrawBuffer).

ERRORS
       GL_INVALID_ENUM is generated if opcode is not an accepted value.

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

ASSOCIATED GETS
       glGet with argument GL_LOGIC_OP_MODE.
       glIsEnabled with argument GL_COLOR_LOGIC_OP or GL_INDEX_LOGIC_OP.

SEE ALSO
       glAlphaFunc, glBlendFunc, glDrawBuffer, glEnable, glStencilOp

								 GLLOGICOP(3G)
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