GLGETHISTOGRAMPARAMETER(3G) GLGETHISTOGRAMPARAMETER(3G)
NAME
glGetHistogramParameterfv, glGetHistogramParameteriv - get histogram parameters
C SPECIFICATION
void glGetHistogramParameterfv( GLenum target,
GLenum pname,
GLfloat
*params )
void glGetHistogramParameteriv( GLenum target,
GLenum pname,
GLint
*params )
PARAMETERS
w'target  'u 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:
center; lb lb l l. _ 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 center; lb lb l l. _ 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 _
NOTES
glGetHistogramParameter is present only if GL_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(3G), glHistogram(3G)