fglPixelMapusv man page on IRIX

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fglPixelMap(3G)		       OpenGL Reference		       fglPixelMap(3G)

NAME
     fglPixelMapfv, fglPixelMapuiv, fglPixelMapusv - set up pixel transfer
     maps

FORTRAN SPECIFICATION
     SUBROUTINE fglPixelMapfv( INTEGER*4 map,
			       INTEGER*4 mapsize,
			       CHARACTER*8 values )
     SUBROUTINE fglPixelMapuiv( INTEGER*4 map,
				INTEGER*4 mapsize,
				CHARACTER*8 values )
     SUBROUTINE fglPixelMapusv( INTEGER*4 map,
				INTEGER*4 mapsize,
				CHARACTER*8 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
     fglPixelMap sets up translation tables, or maps, used by fglCopyPixels,
     fglCopyTexImage1D, fglCopyTexImage2D, fglCopyTexSubImage1D,
     fglCopyTexSubImage2D, fglCopyTexSubImage3D, fglDrawPixels, fglReadPixels,
     fglTexImage1D, fglTexImage2D, fglTexImage3D, fglTexSubImage1D,
     fglTexSubImage2D, and fglTexSubImage3D.  Additionally, if the
     GL_ARB_imaging subset is supported, the routines fglColorTable,
     fglColorSubTable, fglConvolutionFilter1D, fglConvolutionFilter2D,
     fglHistogram, fglMinmax, and fglSeparableFilter2D.	 Use of these maps is
     described completely in the fglPixelTransfer 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:

     GL_PIXEL_MAP_I_TO_I	   Maps color indices to color indices.

     GL_PIXEL_MAP_S_TO_S	   Maps stencil indices to stencil indices.

									Page 1

fglPixelMap(3G)		       OpenGL Reference		       fglPixelMap(3G)

     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 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 format, with
     unspecified mantissa and exponent sizes.  Floating-point values specified
     by fglPixelMapfv are converted directly to the internal floating-point
     format of these maps, then clamped to the range [0,1].  Unsigned integer
     values specified by fglPixelMapusv and fglPixelMapuiv 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 fglPixelMapfv are converted directly to the internal fixed-point
     format of these maps.  Unsigned integer values specified by
     fglPixelMapusv and fglPixelMapuiv 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
		n
     mapsize = 2  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 fglGet with argument GL_MAX_PIXEL_MAP_TABLE.	 The
     single maximum applies to all maps; it is at least 32.

									Page 2

fglPixelMap(3G)		       OpenGL Reference		       fglPixelMap(3G)

_____________________________________________________________________________________
map		       Lookup Index	Lookup Value	Initial Size   Initial 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 fglPixelMap is executed between the
     execution of fglBegin and the corresponding execution of fglEnd.

ASSOCIATED GETS
     fglGetPixelMap
     fglGet with argument GL_PIXEL_MAP_I_TO_I_SIZE
     fglGet with argument GL_PIXEL_MAP_S_TO_S_SIZE
     fglGet with argument GL_PIXEL_MAP_I_TO_R_SIZE
     fglGet with argument GL_PIXEL_MAP_I_TO_G_SIZE
     fglGet with argument GL_PIXEL_MAP_I_TO_B_SIZE
     fglGet with argument GL_PIXEL_MAP_I_TO_A_SIZE
     fglGet with argument GL_PIXEL_MAP_R_TO_R_SIZE
     fglGet with argument GL_PIXEL_MAP_G_TO_G_SIZE
     fglGet with argument GL_PIXEL_MAP_B_TO_B_SIZE
     fglGet with argument GL_PIXEL_MAP_A_TO_A_SIZE
     fglGet with argument GL_MAX_PIXEL_MAP_TABLE

SEE ALSO
     fglColorTable, fglColorSubTable, fglConvolutionFilter1D,
     fglConvolutionFilter2D, fglCopyPixels, fglCopyTexImage1D,
     fglCopyTexImage2D, fglCopyTexSubImage1D, fglCopyTexSubImage2D,
     fglDrawPixels, fglHistogram, fglMinmax, fglPixelStore, fglPixelTransfer,
     fglReadPixels, fglSeparableFilter2D, fglTexImage1D, fglTexImage2D,
     fglTexImage3D, fglTexSubImage1D, fglTexSubImage2D, fglTexSubImage3D

									Page 3

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