fglGetHistogramParameter(3G) OpenGL Reference fglGetHistogramParameter(3G)NAME
fglGetHistogramParameterfv, fglGetHistogramParameteriv - get histogram
parameters
FORTRAN SPECIFICATION
SUBROUTINE fglGetHistogramParameterfv( INTEGER*4 target,
INTEGER*4 pname,
CHARACTER*8 params )
SUBROUTINE fglGetHistogramParameteriv( INTEGER*4 target,
INTEGER*4 pname,
CHARACTER*8 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
fglGetHistogramParameter is used to query parameter values for the
current histogram or for a proxy. The histogram state information may be
queried by calling fglGetHistogramParameter 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:
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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
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fglGetHistogramParameter(3G) OpenGL Reference fglGetHistogramParameter(3G)
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Parameter Description
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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
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NOTES
fglGetHistogramParameter is present only if GL_ARB_imaging is returned
when fglGetString 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 fglGetHistogramParameter is executed
between the execution of fglBegin and the corresponding execution of
fglEnd.
SEE ALSO
fglGetHistogram, fglHistogram
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