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GLGETPIXELMAP(3G)			  OpenGL Manual 			GLGETPIXELMAP(3G)

NAME
       glGetPixelMap - return the specified pixel map

C SPECIFICATION
       void glGetPixelMapfv(GLenum map, GLfloat * data);

       void glGetPixelMapuiv(GLenum map, GLuint * data);

       void glGetPixelMapusv(GLenum map, GLushort * data);

PARAMETERS
       map
	   Specifies the name of the pixel map to return. Accepted values are
	   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, and GL_PIXEL_MAP_A_TO_A.

       data
	   Returns the pixel map contents.

DESCRIPTION
       See the glPixelMap() reference page for a description of the acceptable values for the map
       parameter.  glGetPixelMap returns in data the contents of the pixel map specified in map.
       Pixel maps are used during the execution of glReadPixels(), glDrawPixels(),
       glCopyPixels(), glTexImage1D(), glTexImage2D(), glTexImage3D(), glTexSubImage1D(),
       glTexSubImage2D(), glTexSubImage3D(), glCopyTexImage1D(), glCopyTexImage2D(),
       glCopyTexSubImage1D(), glCopyTexSubImage2D(), and glCopyTexSubImage3D(). to map color
       indices, stencil indices, color components, and depth components to other values.

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

       Unsigned integer values, if requested, are linearly mapped from the internal fixed or
       floating-point representation such that 1.0 maps to the largest representable integer
       value, and 0.0 maps to 0. Return unsigned integer values are undefined if the map value
       was not in the range [0,1].

       To determine the required size of map, call glGet() with the appropriate symbolic
       constant.

NOTES
       If an error is generated, no change is made to the contents of data.

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

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
       GL_PIXEL_PACK_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_PACK_BUFFER target and the data would be packed to the buffer object such that
       the memory writes required would exceed the data store size.

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

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

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

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

ASSOCIATED GETS
       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_PACK_BUFFER_BINDING

SEE ALSO
       glColorSubTable(), glColorTable(), glConvolutionFilter1D(), glConvolutionFilter2D(),
       glCopyColorSubTable(), glCopyColorTable(), glCopyPixels(), glCopyTexImage1D(),
       glCopyTexImage2D(), glCopyTexSubImage1D(), glCopyTexSubImage2D(), glCopyTexSubImage3D(),
       glDrawPixels(), glGetHistogram(), glGetMinmax(), glGetTexImage(), glPixelMap(),
       glPixelTransfer(), glReadPixels(), glSeparableFilter2D(), glTexImage1D(), glTexImage1D(),
       glTexImage2D()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				GLGETPIXELMAP(3G)
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