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GLPIXELMAP(3G)				  OpenGL Manual 			   GLPIXELMAP(3G)

NAME
       glPixelMap - set up pixel transfer maps

C SPECIFICATION
       void glPixelMapfv(GLenum map, GLsizei mapsize, const GLfloat * values);

       void glPixelMapuiv(GLenum map, GLsizei mapsize, const GLuint * values);

       void glPixelMapusv(GLenum map, GLsizei mapsize, const GLushort * values);

PARAMETERS
       map
	   Specifies a symbolic map name. Must be one of the following: GL_PIXEL_MAP_I_TO_I,
	   GL_PIXEL_MAP_S_TO_S, GL_PIXEL_MAP_I_TO_R, GL_PIXEL_MAP_I_TO_G, GL_PIXEL_MAP_I_TO_B,
	   GL_PIXEL_MAP_I_TO_A, GL_PIXEL_MAP_R_TO_R, GL_PIXEL_MAP_G_TO_G, GL_PIXEL_MAP_B_TO_B, or
	   GL_PIXEL_MAP_A_TO_A.

       mapsize
	   Specifies the size of the map being defined.

       values
	   Specifies an array of mapsize values.

DESCRIPTION
       glPixelMap sets up translation tables, or maps, used by glCopyPixels(),
       glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(), glCopyTexSubImage2D(),
       glCopyTexSubImage3D(), glDrawPixels(), glReadPixels(), glTexImage1D(), glTexImage2D(),
       glTexImage3D(), glTexSubImage1D(), glTexSubImage2D(), and glTexSubImage3D(). Additionally,
       if the ARB_imaging subset is supported, the routines glColorTable(), glColorSubTable(),
       glConvolutionFilter1D(), glConvolutionFilter2D(), glHistogram(), glMinmax(), and
       glSeparableFilter2D(). Use of these maps is described completely in the glPixelTransfer()
       reference page, and partly in the reference pages for the pixel and texture image
       commands. Only the specification of the maps is described in this reference page.

       map is a symbolic map name, indicating one of ten maps to set.  mapsize specifies the
       number of entries in the map, and values is a pointer to an array of mapsize map values.

       If a non-zero named buffer object is bound to the GL_PIXEL_UNPACK_BUFFER target (see
       glBindBuffer()) while a pixel transfer map is specified, values is treated as a byte
       offset into the buffer object's data store.

       The ten maps are as follows:

       GL_PIXEL_MAP_I_TO_I
	   Maps color indices to color indices.

       GL_PIXEL_MAP_S_TO_S
	   Maps stencil indices to stencil indices.

       GL_PIXEL_MAP_I_TO_R
	   Maps color indices to red components.

       GL_PIXEL_MAP_I_TO_G
	   Maps color indices to green components.

       GL_PIXEL_MAP_I_TO_B
	   Maps color indices to blue components.

       GL_PIXEL_MAP_I_TO_A
	   Maps color indices to alpha components.

       GL_PIXEL_MAP_R_TO_R
	   Maps red components to red components.

       GL_PIXEL_MAP_G_TO_G
	   Maps green components to green components.

       GL_PIXEL_MAP_B_TO_B
	   Maps blue components to blue components.

       GL_PIXEL_MAP_A_TO_A
	   Maps alpha components to alpha components.

       The entries in a map can be specified as single-precision floating-point numbers, unsigned
       short integers, or unsigned int integers. Maps that store color component values (all but
       GL_PIXEL_MAP_I_TO_I and GL_PIXEL_MAP_S_TO_S) retain their values in floating-point format,
       with unspecified mantissa and exponent sizes. Floating-point values specified by
       glPixelMapfv are converted directly to the internal floating-point format of these maps,
       then clamped to the range [0,1]. Unsigned integer values specified by glPixelMapusv and
       glPixelMapuiv are converted linearly such that the largest representable integer maps to
       1.0, and 0 maps to 0.0.

       Maps that store indices, GL_PIXEL_MAP_I_TO_I and GL_PIXEL_MAP_S_TO_S, retain their values
       in fixed-point format, with an unspecified number of bits to the right of the binary
       point. Floating-point values specified by glPixelMapfv are converted directly to the
       internal fixed-point format of these maps. Unsigned integer values specified by
       glPixelMapusv and glPixelMapuiv specify integer values, with all 0's to the right of the
       binary point.

       The following table shows the initial sizes and values for each of the maps. Maps that are
       indexed by either color or stencil indices must have mapsize = 2 n for some n or the
       results are undefined. The maximum allowable size for each map depends on the
       implementation and can be determined by calling glGet() with argument
       GL_MAX_PIXEL_MAP_TABLE. The single maximum applies to all maps; it is at least 32.

       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |			    |				     |				      | 				|				  |
       |			map |			      Lookup |			       Lookup | 			Initial |			  Initial |
       |			    | Index			     | Value			      | Size				| Value 			  |
       |			    |				     |				      | 				|				  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_I_TO_I	    |	       color index	     |		color index	      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_S_TO_S	    |	      stencil index	     |	       stencil index	      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_I_TO_R	    |	       color index	     |		     R		      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_I_TO_G	    |	       color index	     |		     G		      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_I_TO_B	    |	       color index	     |		     B		      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_I_TO_A	    |	       color index	     |		     A		      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_R_TO_R	    |		    R		     |		     R		      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_G_TO_G	    |		    G		     |		     G		      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_B_TO_B	    |		    B		     |		     B		      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+
       |GL_PIXEL_MAP_A_TO_A	    |		    A		     |		     A		      | 	       1		|		 0		  |
       +----------------------------+--------------------------------+--------------------------------+---------------------------------+---------------------------------+

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

       GL_INVALID_VALUE is generated if mapsize is less than one or larger than
       GL_MAX_PIXEL_MAP_TABLE.

       GL_INVALID_VALUE is generated if map is GL_PIXEL_MAP_I_TO_I, GL_PIXEL_MAP_S_TO_S,
       GL_PIXEL_MAP_I_TO_R, GL_PIXEL_MAP_I_TO_G, GL_PIXEL_MAP_I_TO_B, or GL_PIXEL_MAP_I_TO_A, and
       mapsize is not a power of two.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
       GL_PIXEL_UNPACK_BUFFER target and the buffer object's data store is currently mapped.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
       GL_PIXEL_UNPACK_BUFFER target and the data would be unpacked from the buffer object such
       that the memory reads required would exceed the data store size.

       GL_INVALID_OPERATION is generated by glPixelMapfv if a non-zero buffer object name is
       bound to the GL_PIXEL_UNPACK_BUFFER target and values is not evenly divisible into the
       number of bytes needed to store in memory a GLfloat datum.

       GL_INVALID_OPERATION is generated by glPixelMapuiv if a non-zero buffer object name is
       bound to the GL_PIXEL_UNPACK_BUFFER target and values is not evenly divisible into the
       number of bytes needed to store in memory a GLuint datum.

       GL_INVALID_OPERATION is generated by glPixelMapusv if a non-zero buffer object name is
       bound to the GL_PIXEL_UNPACK_BUFFER target and values is not evenly divisible into the
       number of bytes needed to store in memory a GLushort datum.

       GL_INVALID_OPERATION is generated if glPixelMap is executed between the execution of
       glBegin() and the corresponding execution of glEnd().

ASSOCIATED GETS
       glGetPixelMap()

       glGet() with argument GL_PIXEL_MAP_I_TO_I_SIZE

       glGet() with argument GL_PIXEL_MAP_S_TO_S_SIZE

       glGet() with argument GL_PIXEL_MAP_I_TO_R_SIZE

       glGet() with argument GL_PIXEL_MAP_I_TO_G_SIZE

       glGet() with argument GL_PIXEL_MAP_I_TO_B_SIZE

       glGet() with argument GL_PIXEL_MAP_I_TO_A_SIZE

       glGet() with argument GL_PIXEL_MAP_R_TO_R_SIZE

       glGet() with argument GL_PIXEL_MAP_G_TO_G_SIZE

       glGet() with argument GL_PIXEL_MAP_B_TO_B_SIZE

       glGet() with argument GL_PIXEL_MAP_A_TO_A_SIZE

       glGet() with argument GL_MAX_PIXEL_MAP_TABLE

       glGet() with argument GL_PIXEL_UNPACK_BUFFER_BINDING

SEE ALSO
       glColorTable(), glColorSubTable(), glConvolutionFilter1D(), glConvolutionFilter2D(),
       glCopyPixels(), glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(),
       glCopyTexSubImage2D(), glDrawPixels(), glHistogram(), glMinmax(), glPixelStore(),
       glPixelTransfer(), glReadPixels(), glSeparableFilter2D(), glTexImage1D(), glTexImage2D(),
       glTexImage3D(), glTexSubImage1D(), glTexSubImage2D(), glTexSubImage3D()

COPYRIGHT
       Copyright (C) 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				    06/10/2014				   GLPIXELMAP(3G)
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