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Manual Reference Pages  - GLGETHISTOGRAMPARAMETER (3G)

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glGetHistogramParameterfv, glGetHistogramParameteriv - get histogram parameters

CONTENTS

C Specification
Parameters
Description
Notes
Errors
See Also

void glGetHistogramParameterfv( GLenum target,

                              GLenum pname,
                              GLfloat *params )

void glGetHistogramParameteriv( GLenum target,

                              GLenum pname,
                              GLint *params )

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.

 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
GL_HISTOGRAM_RED_SIZE	Red component counter size, in bits
GL_HISTOGRAM_GREEN_SIZE	Green component counter size, in bits

Parameter	Description
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

 glGetHistogramParameter is present only if  GL_ARB_imaging is returned when  glGetString is called with an argument of  GL_EXTENSIONS.

 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.

 glGetHistogram(3G),  glHistogram(3G)

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