glPixelMap man page on DigitalUNIX

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glPixelMap(3G)							glPixelMap(3G)

       glPixelMap,  glPixelMapfv,  glPixelMapuiv, glPixelMapusv - set up pixel
       transfer maps

       void glPixelMapfv(
	       GLenum map,
	       GLint mapsize,
	       const GLfloat *values ); void glPixelMapuiv(
	       GLenum map,
	       GLint mapsize,
	       const GLuint *values ); void glPixelMapusv(
	       GLenum map,
	       GLint mapsize,
	       const GLushort *values );

       Specifies  a  symbolic  map  name.  Must	 be  one  of  the   following:
       GL_PIXEL_MAP_A_TO_A.  Specifies the size	 of  the  map  being  defined.
       Specifies an array of mapsize values.

       glPixelMap()  sets  up  translation tables, or maps, used by glCopyPix‐
       els(), glCopyTexImage1D(),  glCopyTexImage2D(),	glCopyTexSubImage1D(),
       glCopyTexSubImage2D(),  glCopyTexSubImage3D(),  glDrawPixels(), glRead‐
       Pixels(), glTexImage1D(), glTexImage2D(),  glTexImage3D(),  glTexSubIm‐
       age1D(), glTexSubImage2D(), and glTexSubImage3D(). Additionally, if the
       GL_ARB_imaging subset is supported, the routines glColorTable(), glCol‐
       orSubTable(),  glConvolutionFilter1D(), glConvolutionFilter2D(), glHis‐
       togram(), 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.

       The ten maps are as follows: Maps color indices to color indices.  Maps
       stencil indices to stencil indices.  Maps color indices to  red	compo‐
       nents.	Maps color indices to green components.	 Maps color indices to
       blue components.	 Maps color indices to	alpha  components.   Maps  red
       components  to  red  components.	 Maps green components to green compo‐
       nents.  Maps blue components to blue components.	 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 long 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  ,  with
       unspecified  mantissa  and exponent sizes. Floating-point values speci‐
       fied by glPixelMapfv() are converted directly to the internal floating-
       point  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 , 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  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 sup 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_TA‐
       BLE. The single maximum applies to all maps; it is at least 32.

       map		     Lookup Index    Lookup Value    Initial   Ini‐
							     Size      tial
       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

       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

       GL_INVALID_VALUE	  is   generated   if	map   is  GL_PIXEL_MAP_I_TO_I,
       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 glPixelMap() is  executed  between
       the execution of glBegin() and the corresponding execution of glEnd().

       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

       glColorTable(3), glColorSubTable(3), glConvolutionFilter1D(3), glConvo‐
       lutionFilter2D(3), glCopyPixels(3),  glCopyTexImage1D(3),  glCopyTexIm‐
       age2D(3),  glCopyTexSubImage1D(3),  glCopyTexSubImage2D(3),  glDrawPix‐
       els(3),	glHistogram(3),	 glMinmax(3),  glPixelStore(3),	 glPixelTrans‐
       fer(3),	 glReadPixels(3),   glSeparableFilter2D(3),   glTexImage1D(3),
       glTexImage2D(3),	  glTexImage3D(3),   glTexSubImage1D(3),   glTexSubIm‐
       age2D(3), glTexSubImage3D(3)


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