glMinmax man page on Oracle

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GLMINMAX(3G)			 OpenGL Manual			  GLMINMAX(3G)

NAME
       glMinmax - define minmax table

C SPECIFICATION
       void glMinmax(GLenum target, GLenum internalformat, GLboolean sink);

PARAMETERS
       target
	   The minmax table whose parameters are to be set. Must be GL_MINMAX.

       internalformat
	   The format of entries in the minmax table. Must be one of GL_ALPHA,
	   GL_ALPHA4, GL_ALPHA8, GL_ALPHA12, GL_ALPHA16, GL_LUMINANCE,
	   GL_LUMINANCE4, GL_LUMINANCE8, GL_LUMINANCE12, GL_LUMINANCE16,
	   GL_LUMINANCE_ALPHA, GL_LUMINANCE4_ALPHA4, GL_LUMINANCE6_ALPHA2,
	   GL_LUMINANCE8_ALPHA8, GL_LUMINANCE12_ALPHA4,
	   GL_LUMINANCE12_ALPHA12, GL_LUMINANCE16_ALPHA16, GL_R3_G3_B2,
	   GL_RGB, GL_RGB4, GL_RGB5, GL_RGB8, GL_RGB10, GL_RGB12, GL_RGB16,
	   GL_RGBA, GL_RGBA2, GL_RGBA4, GL_RGB5_A1, GL_RGBA8, GL_RGB10_A2,
	   GL_RGBA12, or GL_RGBA16.

       sink
	   If GL_TRUE, pixels will be consumed by the minmax process and no
	   drawing or texture loading will take place. If GL_FALSE, pixels
	   will proceed to the final conversion process after minmax.

DESCRIPTION
       When GL_MINMAX is enabled, the RGBA components of incoming pixels are
       compared to the minimum and maximum values for each component, which
       are stored in the two-element minmax table. (The first element stores
       the minima, and the second element stores the maxima.) If a pixel
       component is greater than the corresponding component in the maximum
       element, then the maximum element is updated with the pixel component
       value. If a pixel component is less than the corresponding component in
       the minimum element, then the minimum element is updated with the pixel
       component value. (In both cases, if the internal format of the minmax
       table includes luminance, then the R color component of incoming pixels
       is used for comparison.) The contents of the minmax table may be
       retrieved at a later time by calling glGetMinmax(). The minmax
       operation is enabled or disabled by calling glEnable() or glDisable(),
       respectively, with an argument of GL_MINMAX.

       glMinmax redefines the current minmax table to have entries of the
       format specified by internalformat. The maximum element is initialized
       with the smallest possible component values, and the minimum element is
       initialized with the largest possible component values. The values in
       the previous minmax table, if any, are lost. If sink is GL_TRUE, then
       pixels are discarded after minmax; no further processing of the pixels
       takes place, and no drawing, texture loading, or pixel readback will
       result.

NOTES
       glMinmax 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 one of the allowable
       values.

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

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

ASSOCIATED GETS
       glGetMinmaxParameter()

SEE ALSO
       glGetMinmax(), 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			  04/29/2014			  GLMINMAX(3G)
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