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GLLOGICOP(3G)			 OpenGL Manual			 GLLOGICOP(3G)

NAME
       glLogicOp - specify a logical pixel operation for 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 RGBA color and the 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. The initial value is disabled.

       ┌───────────────────────────────┬───────────────────────────────────┐
       │			       │				   │
       │			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
       and d represents the color in the frame buffer. Standard C-language
       operators are used. As these bitwise operators suggest, the logical
       operation is applied independently to each bit pair of the source and
       destination colors.

NOTES
       When more than one RGBA color 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()).

       Logic operations have no effect on floating point draw buffers.
       However, if GL_COLOR_LOGIC_OP is enabled, blending is still disabled in
       this case.

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

ASSOCIATED GETS
       glGet() with argument GL_LOGIC_OP_MODE.

       glIsEnabled() with argument GL_COLOR_LOGIC_OP.

SEE ALSO
       glBlendFunc(), glDrawBuffer(), glEnable(), glStencilOp()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  04/29/2014			 GLLOGICOP(3G)

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