C SPECIFICATION

       void GLAPIENTRY glPixelMapfv( GLenum map,
                                     GLsizei mapsiz )
       void GLAPIENTRY glPixelMapuiv( GLenum map,
                                      GLsizei mapsiz )
       void GLAPIENTRY glPixelMapusv( GLenum map,
                                      GLsizei mapsiz )

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.

       mapsiz  Specifies the size of the map being defined.

       _param3 Specifies an array of mapsiz 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
       GL_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.  mapsiz
       specifies the number of entries in the map, and _param3 is a pointer to
       an array of mapsiz map values.

       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.

       unspecified mantissa and exponent sizes.  Floating-point values speci-
       fied 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 con-
       verted 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 speci-
       fied 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 mapsiz = 2n 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.































 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 mapsiz 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 mapsiz is not a power
       of two.

       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

SEE ALSO

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



                                                                GLPIXELMAP(3G)