glgethistogramparameter(3g) [centos man page]
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 (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 GLGETHISTOGRAMPARAME(3G)
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GLGETCOLORTABLEPARAM(3G) OpenGL Manual GLGETCOLORTABLEPARAM(3G) NAME
glGetColorTableParameter - get color lookup table parameters C SPECIFICATION
void glGetColorTableParameterfv(GLenum target, GLenum pname, GLfloat * params); void glGetColorTableParameteriv(GLenum target, GLenum pname, GLint * params); PARAMETERS
target The target color table. Must be GL_COLOR_TABLE, GL_POST_CONVOLUTION_COLOR_TABLE, GL_POST_COLOR_MATRIX_COLOR_TABLE, GL_PROXY_COLOR_TABLE, GL_PROXY_POST_CONVOLUTION_COLOR_TABLE, or GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE. pname The symbolic name of a color lookup table parameter. Must be one of GL_COLOR_TABLE_BIAS, GL_COLOR_TABLE_SCALE, GL_COLOR_TABLE_FORMAT, GL_COLOR_TABLE_WIDTH, GL_COLOR_TABLE_RED_SIZE, GL_COLOR_TABLE_GREEN_SIZE, GL_COLOR_TABLE_BLUE_SIZE, GL_COLOR_TABLE_ALPHA_SIZE, GL_COLOR_TABLE_LUMINANCE_SIZE, or GL_COLOR_TABLE_INTENSITY_SIZE. params A pointer to an array where the values of the parameter will be stored. DESCRIPTION
Returns parameters specific to color table target. When pname is set to GL_COLOR_TABLE_SCALE or GL_COLOR_TABLE_BIAS, glGetColorTableParameter returns the color table scale or bias parameters for the table specified by target. For these queries, target must be set to GL_COLOR_TABLE, GL_POST_CONVOLUTION_COLOR_TABLE, or GL_POST_COLOR_MATRIX_COLOR_TABLE and params points to an array of four elements, which receive the scale or bias factors for red, green, blue, and alpha, in that order. glGetColorTableParameter can also be used to retrieve the format and size parameters for a color table. For these queries, set target to either the color table target or the proxy color table target. The format and size parameters are set by glColorTable(). The following table lists the format and size parameters that may be queried. For each symbolic constant listed below for pname, params must point to an array of the given length and receive the values indicated. +----------------------------------+---------------------------+---------------------------------+ | | | | | Parameter | N | Meaning | | | | | +----------------------------------+---------------------------+---------------------------------+ |GL_COLOR_TABLE_FORMAT | 1 | Internal format (e.g., GL_RGBA) | +----------------------------------+---------------------------+---------------------------------+ |GL_COLOR_TABLE_WIDTH | 1 | Number of elements in table | +----------------------------------+---------------------------+---------------------------------+ |GL_COLOR_TABLE_RED_SIZE | 1 | Size of red component, in bits | +----------------------------------+---------------------------+---------------------------------+ |GL_COLOR_TABLE_GREEN_SIZE | 1 | Size of green component | +----------------------------------+---------------------------+---------------------------------+ |GL_COLOR_TABLE_BLUE_SIZE | 1 | Size of blue component | +----------------------------------+---------------------------+---------------------------------+ |GL_COLOR_TABLE_ALPHA_SIZE | 1 | Size of alpha component | +----------------------------------+---------------------------+---------------------------------+ |GL_COLOR_TABLE_LUMINANCE_SIZE | 1 | Size of luminance component | +----------------------------------+---------------------------+---------------------------------+ |GL_COLOR_TABLE_INTENSITY_SIZE | 1 | Size of intensity component | +----------------------------------+---------------------------+---------------------------------+ NOTES
glGetColorTableParameter 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 or pname is not an acceptable value. GL_INVALID_OPERATION is generated if glGetColorTableParameter is executed between the execution of glBegin() and the corresponding execution of glEnd(). SEE ALSO
glColorTable(), glTexParameter(), glColorTableParameter() 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 GLGETCOLORTABLEPARAM(3G)