glgetminmaxparameter(3g) [centos man page]

GLGETMINMAXPARAMETER(3G)					   OpenGL Manual					  GLGETMINMAXPARAMETER(3G)

NAME

       glGetMinmaxParameter - get minmax parameters

C SPECIFICATION

       void glGetMinmaxParameterfv(GLenum target, GLenum pname, GLfloat * params);

       void glGetMinmaxParameteriv(GLenum target, GLenum pname, GLint * params);

PARAMETERS

       target
	   Must be GL_MINMAX.

       pname
	   The parameter to be retrieved. Must be one of GL_MINMAX_FORMAT or GL_MINMAX_SINK.

       params
	   A pointer to storage for the retrieved parameters.

DESCRIPTION

       glGetMinmaxParameter retrieves parameters for the current minmax table by setting pname to one of the following values:

       +----------------------------------+-------------------------------------+
       |				  |					|
       |			Parameter |			    Description |
       |				  |					|
       +----------------------------------+-------------------------------------+
       |GL_MINMAX_FORMAT		  | Internal format of minmax table	|
       +----------------------------------+-------------------------------------+
       |GL_MINMAX_SINK			  | Value of the sink parameter 	|
       +----------------------------------+-------------------------------------+

NOTES

       glGetMinmaxParameter 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 pname is not one of the allowable values.

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

SEE ALSO

       glMinmax(), glGetMinmax()

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						  GLGETMINMAXPARAMETER(3G)

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)