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

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
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 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)