glGetHistogramParameter man page on Oracle
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GLGETHISTOGRAMPARAME(3G) OpenGL Manual GLGETHISTOGRAMPARAME(3G)
NAME
glGetHistogramParameter - get histogram parameters
C SPECIFICATION
void glGetHistogramParameterfv(GLenum target, GLenum pname,
GLfloat * params);
void glGetHistogramParameteriv(GLenum target, GLenum pname,
GLint * params);
PARAMETERS
target
Must be one of GL_HISTOGRAM or GL_PROXY_HISTOGRAM.
pname
The name of the parameter to be retrieved. Must be one of
GL_HISTOGRAM_WIDTH, GL_HISTOGRAM_FORMAT, GL_HISTOGRAM_RED_SIZE,
GL_HISTOGRAM_GREEN_SIZE, GL_HISTOGRAM_BLUE_SIZE,
GL_HISTOGRAM_ALPHA_SIZE, GL_HISTOGRAM_LUMINANCE_SIZE, or
GL_HISTOGRAM_SINK.
params
Pointer to storage for the returned values.
DESCRIPTION
glGetHistogramParameter is used to query parameter values for the
current histogram or for a proxy. The histogram state information may
be queried by calling glGetHistogramParameter with a target of
GL_HISTOGRAM (to obtain information for the current histogram table) or
GL_PROXY_HISTOGRAM (to obtain information from the most recent proxy
request) and one of the following values for the pname argument:
┌──────────────────────────────────┬─────────────────────────────────────┐
│ │ │
│ Parameter │ Description │
│ │ │
├──────────────────────────────────┼─────────────────────────────────────┤
│GL_HISTOGRAM_WIDTH │ Histogram table width │
├──────────────────────────────────┼─────────────────────────────────────┤
│GL_HISTOGRAM_FORMAT │ Internal format │
├──────────────────────────────────┼─────────────────────────────────────┤
│GL_HISTOGRAM_RED_SIZE │ Red component counter size, in bits │
├──────────────────────────────────┼─────────────────────────────────────┤
│GL_HISTOGRAM_GREEN_SIZE │ Green component counter size, in │
│ │ bits │
├──────────────────────────────────┼─────────────────────────────────────┤
│GL_HISTOGRAM_BLUE_SIZE │ Blue component counter size, in │
│ │ bits │
├──────────────────────────────────┼─────────────────────────────────────┤
│GL_HISTOGRAM_ALPHA_SIZE │ Alpha component counter size, in │
│ │ bits │
├──────────────────────────────────┼─────────────────────────────────────┤
│GL_HISTOGRAM_LUMINANCE_SIZE │ Luminance component counter size, │
│ │ in bits │
├──────────────────────────────────┼─────────────────────────────────────┤
│GL_HISTOGRAM_SINK │ Value of the sink parameter │
└──────────────────────────────────┴─────────────────────────────────────┘
NOTES
glGetHistogramParameter 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 pname is not one of the allowable
values.
GL_INVALID_OPERATION is generated if glGetHistogramParameter is
executed between the execution of glBegin() and the corresponding
execution of glEnd().
SEE ALSO
glGetHistogram(), glHistogram()
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 GLGETHISTOGRAMPARAME(3G)
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