glGetHistogramParameter(3) glGetHistogramParameter(3)
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
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 cur-
rent 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
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 val-
ues.
GL_INVALID_ENUM is generated if pname is not one of the allowable val-
ues.
GL_INVALID_OPERATION is generated if glGetHistogramParameter is exe-
cuted between the execution of glBegin and the corresponding execution
of glEnd.
SEE ALSO
glGetHistogram(3), glHistogram(3)
glGetHistogramParameter(3)
Mac OS X 10.6 - Generated Thu Sep 17 20:20:21 CDT 2009