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GLGETMINMAX(3G) 								  GLGETMINMAX(3G)

NAME
       glGetMinmax - get minimum and maximum pixel values

C SPECIFICATION
       void glGetMinmax( GLenum target,
			 GLboolean reset,
			 GLenum format,
			 GLenum types,
			 GLvoid *values )

PARAMETERS
       target  Must be GL_MINMAX.

       reset   If  GL_TRUE,  all entries in the minmax table that are actually returned are reset
	       to their initial values.  (Other entries are unaltered.)  If GL_FALSE, the  minmax
	       table is unaltered.

       format  The   of  the  data  to	be  returned in values.  Must be one of GL_RED, GL_GREEN,
	       GL_BLUE,  GL_ALPHA,   GL_RGB,   GL_BGR,	 GL_RGBA,   GL_BGRA,   GL_LUMINANCE,   or
	       GL_LUMINANCE_ALPHA.

       types   The   type   of	 the   data   to  be  returned	in  values.   Symbolic	constants
	       GL_UNSIGNED_BYTE,     GL_BYTE,	  GL_BITMAP,	 GL_UNSIGNED_SHORT,	GL_SHORT,
	       GL_UNSIGNED_INT, 	GL_INT, 	GL_FLOAT,	  GL_UNSIGNED_BYTE_3_3_2,
	       GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5,  GL_UNSIGNED_SHORT_5_6_5_REV,
	       GL_UNSIGNED_SHORT_4_4_4_4,			   GL_UNSIGNED_SHORT_4_4_4_4_REV,
	       GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8,
	       GL_UNSIGNED_INT_8_8_8_8_REV,	       GL_UNSIGNED_INT_10_10_10_2,	      and
	       GL_UNSIGNED_INT_2_10_10_10_REV are accepted.

       values  A pointer to storage for the returned values.

DESCRIPTION
       glGetMinmax returns the accumulated minimum and maximum pixel values (computed on  a  per-
       component  basis)  in  a one-dimensional image of width 2.  The first set of return values
       are the minima, and the second set of return values are the maxima.  The   of  the  return
       values is determined by format, and their type is determined by types.

       No  pixel  transfer operations are performed on the return values, but pixel storage modes
       that are applicable to 1-dimensional images are	performed.   Color  components	that  are
       requested  in the specified format, but that are not included in the internal  of the min-
       max table, are returned as zero.  The assignment of internal color components to the  com-
       ponents requested by format are as follows:

				-----------------------------------------
				Internal Component   Resulting Component
				-----------------------------------------
				Red		     Red
				Green		     Green
				Blue		     Blue
				Alpha		     Alpha
				Luminance	     Red
				-----------------------------------------

       If reset is GL_TRUE, the minmax table entries corresponding to the return values are reset
       to their initial values.  Minimum and maximum values that are not returned are  not  modi-
       fied, even if reset is GL_TRUE.

NOTES
       glGetMinmax  is present only if GL_ARB_imaging is returned when glGetString is called with
       an argument of GL_EXTENSIONS.

ERRORS
       GL_INVALID_ENUM is generated if target is not GL_MINMAX.

       GL_INVALID_ENUM is generated if format is not one of the allowable values.

       GL_INVALID_ENUM is generated if types is not one of the allowable values.

       GL_INVALID_OPERATION is generated if glGetMinmax is  executed  between  the  execution  of
       glBegin and the corresponding execution of glEnd.

       GL_INVALID_OPERATION   is   generated   if   types   is	 one  of  GL_UNSIGNED_BYTE_3_3_2,
       GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5,  or  GL_UNSIGNED_SHORT_5_6_5_REV  and
       format is not GL_RGB.

       GL_INVALID_OPERATION   is   generated   if  types  is  one  of  GL_UNSIGNED_SHORT_4_4_4_4,
       GL_UNSIGNED_SHORT_4_4_4_4_REV,  GL_UNSIGNED_SHORT_5_5_5_1,  GL_UNSIGNED_SHORT_1_5_5_5_REV,
       GL_UNSIGNED_INT_8_8_8_8,   GL_UNSIGNED_INT_8_8_8_8_REV,	 GL_UNSIGNED_INT_10_10_10_2,   or
       GL_UNSIGNED_INT_2_10_10_10_REV and format is neither GL_RGBA nor GL_BGRA.

SEE ALSO
       glMinmax(3G), glResetMinmax(3G), glGetMinmaxParameter(3G)

										  GLGETMINMAX(3G)
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