1GLGETHISTOGRAMPARAMETER(3G)                        GLGETHISTOGRAMPARAMETER(3G)
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NAME

6       glGetHistogramParameterfv,  glGetHistogramParameteriv  -  get histogram
7       parameters
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C SPECIFICATION

11       void glGetHistogramParameterfv( GLenum target,
12                                       GLenum pname,
13                                       GLfloat *params )
14       void glGetHistogramParameteriv( GLenum target,
15                                       GLenum pname,
16                                       GLint *params )
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PARAMETERS

20       target  Must be one of GL_HISTOGRAM or GL_PROXY_HISTOGRAM.
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22       pname   The name of the parameter to be  retrieved.   Must  be  one  of
23               GL_HISTOGRAM_WIDTH, GL_HISTOGRAM_FORMAT, GL_HISTOGRAM_RED_SIZE,
24               GL_HISTOGRAM_GREEN_SIZE,                GL_HISTOGRAM_BLUE_SIZE,
25               GL_HISTOGRAM_ALPHA_SIZE,     GL_HISTOGRAM_LUMINANCE_SIZE,    or
26               GL_HISTOGRAM_SINK.
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28       params  Pointer to storage for the returned values.
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DESCRIPTION

31       glGetHistogramParameter is used to query parameter values for the  cur‐
32       rent  histogram or for a proxy.  The histogram state information may be
33       queried  by  calling   glGetHistogramParameter   with   a   target   of
34       GL_HISTOGRAM (to obtain information for the current histogram table) or
35       GL_PROXY_HISTOGRAM (to obtain information from the  most  recent  proxy
36       request) and one of the following values for the pname argument:
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38           ────────────────────────────────────────────────────────────────
39           Parameter                 Description
40           ────────────────────────────────────────────────────────────────
41           GL_HISTOGRAM_WIDTH        Histogram table width
42           GL_HISTOGRAM_FORMAT       Internal
43           GL_HISTOGRAM_RED_SIZE     Red component counter size, in bits
44           GL_HISTOGRAM_GREEN_SIZE   Green component counter size, in bits
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46       ────────────────────────────────────────────────────────────────────────
47       Parameter                     Description
48       ────────────────────────────────────────────────────────────────────────
49       GL_HISTOGRAM_BLUE_SIZE        Blue component counter size, in bits
50       GL_HISTOGRAM_ALPHA_SIZE       Alpha component counter size, in bits
51       GL_HISTOGRAM_LUMINANCE_SIZE   Luminance component counter size, in bits
52       GL_HISTOGRAM_SINK             Value of the sink parameter
53       ────────────────────────────────────────────────────────────────────────
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NOTES

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

61       GL_INVALID_ENUM is generated if target is not one of the allowable val‐
62       ues.
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64       GL_INVALID_ENUM  is generated if pname is not one of the allowable val‐
65       ues.
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67       GL_INVALID_OPERATION is generated if  glGetHistogramParameter  is  exe‐
68       cuted  between the execution of glBegin and the corresponding execution
69       of glEnd.
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SEE ALSO

72       glGetHistogram(3G), glHistogram(3G)
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76                                                   GLGETHISTOGRAMPARAMETER(3G)