Unix/Linux Go Back    


CentOS 7.0 - man page for glminmax (centos section 3G)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


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 (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				     GLMINMAX(3G)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 03:17 PM.