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GLGETMINMAX(3G)			 OpenGL Manual		       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 format 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 format of the return values is
       determined by format, and their type is determined by types.

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

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

       ┌─────────────────────────────────┬───────────────────────────────────┐
       │				 │				     │
       │			Internal │			   Resulting │
       │Component			 │ 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 modified, even if reset is
       GL_TRUE.

NOTES
       glGetMinmax is present only if 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 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.

       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 if a non-zero buffer object name is
       bound to the GL_PIXEL_PACK_BUFFER target and values is not evenly
       divisible into the number of bytes needed to store in memory a datum
       indicated by type.

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

ASSOCIATED GETS
       glGetMinmaxParameter()

       glGet() with argument GL_PIXEL_PACK_BUFFER_BINDING

SEE ALSO
       glMinmax(), glResetMinmax(),

COPYRIGHT
       Copyright © 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			  03/16/2013		       GLGETMINMAX(3G)
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