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"text/html; charset=UTF-8" /><title>glGetConvolutionParameter
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glGetConvolutionParameter"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glGetConvolutionParameter — get convolution parameters
</p></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glGetConvolutionParameterfv
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">target
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">pname
</var>,
</td></tr><tr><td> </td><td>GLfloat *
</td><td><var class=
"pdparam">params
</var><code>)
</code>;
</td></tr></table></div><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glGetConvolutionParameteriv
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">target
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">pname
</var>,
</td></tr><tr><td> </td><td>GLint *
</td><td><var class=
"pdparam">params
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>target
</code></em></span></dt><dd><p>
4 The filter whose parameters are to be retrieved.
6 <code class=
"constant">GL_CONVOLUTION_1D
</code>,
7 <code class=
"constant">GL_CONVOLUTION_2D
</code>, or
8 <code class=
"constant">GL_SEPARABLE_2D
</code>.
9 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>pname
</code></em></span></dt><dd><p>
10 The parameter to be retrieved.
12 <code class=
"constant">GL_CONVOLUTION_BORDER_MODE
</code>,
13 <code class=
"constant">GL_CONVOLUTION_BORDER_COLOR
</code>,
14 <code class=
"constant">GL_CONVOLUTION_FILTER_SCALE
</code>,
15 <code class=
"constant">GL_CONVOLUTION_FILTER_BIAS
</code>,
16 <code class=
"constant">GL_CONVOLUTION_FORMAT
</code>,
17 <code class=
"constant">GL_CONVOLUTION_WIDTH
</code>,
18 <code class=
"constant">GL_CONVOLUTION_HEIGHT
</code>,
19 <code class=
"constant">GL_MAX_CONVOLUTION_WIDTH
</code>, or
20 <code class=
"constant">GL_MAX_CONVOLUTION_HEIGHT
</code>.
21 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>params
</code></em></span></dt><dd><p>
22 Pointer to storage for the parameters to be retrieved.
23 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
24 <code class=
"function">glGetConvolutionParameter
</code> retrieves convolution parameters.
25 <em class=
"parameter"><code>target
</code></em> determines which convolution filter is queried.
26 <em class=
"parameter"><code>pname
</code></em> determines which parameter is returned:
27 </p><div class=
"variablelist"><dl><dt><span class=
"term"><code class=
"constant">GL_CONVOLUTION_BORDER_MODE
</code></span></dt><dd><p>
29 The convolution border mode.
30 See
<a class=
"citerefentry" href=
"glConvolutionParameter.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glConvolutionParameter
</span></span></a> for a list of border modes.
31 </p></dd><dt><span class=
"term"><code class=
"constant">GL_CONVOLUTION_BORDER_COLOR
</code></span></dt><dd><p>
33 The current convolution border color.
34 <em class=
"parameter"><code>params
</code></em> must be a pointer to an array of four elements,
35 which will receive the red, green, blue, and alpha border colors.
36 </p></dd><dt><span class=
"term"><code class=
"constant">GL_CONVOLUTION_FILTER_SCALE
</code></span></dt><dd><p>
38 The current filter scale factors.
39 <em class=
"parameter"><code>params
</code></em> must be a pointer to an array of four elements,
40 which will receive the red, green, blue, and alpha filter scale
41 factors in that order.
42 </p></dd><dt><span class=
"term"><code class=
"constant">GL_CONVOLUTION_FILTER_BIAS
</code></span></dt><dd><p>
44 The current filter bias factors.
45 <em class=
"parameter"><code>params
</code></em> must be a pointer to an array of four elements,
46 which will receive the red, green, blue, and alpha filter bias
48 </p></dd><dt><span class=
"term"><code class=
"constant">GL_CONVOLUTION_FORMAT
</code></span></dt><dd><p>
50 The current internal format.
51 See
<a class=
"citerefentry" href=
"glConvolutionFilter1D.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glConvolutionFilter1D
</span></span></a>,
<a class=
"citerefentry" href=
"glConvolutionFilter2D.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glConvolutionFilter2D
</span></span></a>,
52 and
<a class=
"citerefentry" href=
"glSeparableFilter2D.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glSeparableFilter2D
</span></span></a> for lists of allowable
54 </p></dd><dt><span class=
"term"><code class=
"constant">GL_CONVOLUTION_WIDTH
</code></span></dt><dd><p>
56 The current filter image width.
57 </p></dd><dt><span class=
"term"><code class=
"constant">GL_CONVOLUTION_HEIGHT
</code></span></dt><dd><p>
59 The current filter image height.
60 </p></dd><dt><span class=
"term"><code class=
"constant">GL_MAX_CONVOLUTION_WIDTH
</code></span></dt><dd><p>
62 The maximum acceptable filter image width.
63 </p></dd><dt><span class=
"term"><code class=
"constant">GL_MAX_CONVOLUTION_HEIGHT
</code></span></dt><dd><p>
65 The maximum acceptable filter image height.
66 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
67 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>target
</code></em> is not one of the allowable
70 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>pname
</code></em> is not one of the allowable
73 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>target
</code></em> is
<code class=
"constant">GL_CONVOLUTION_1D
</code>
74 and
<em class=
"parameter"><code>pname
</code></em> is
<code class=
"constant">GL_CONVOLUTION_HEIGHT
</code> or
75 <code class=
"constant">GL_MAX_CONVOLUTION_HEIGHT
</code>.
77 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<code class=
"function">glGetConvolutionParameter
</code> is executed
78 between the execution of
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a> and the corresponding
79 execution of
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a>.
80 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
81 <a class=
"citerefentry" href=
"glGetConvolutionFilter.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetConvolutionFilter
</span></span></a>,
82 <a class=
"citerefentry" href=
"glGetSeparableFilter.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetSeparableFilter
</span></span></a>,
83 <a class=
"citerefentry" href=
"glConvolutionParameter.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glConvolutionParameter
</span></span></a>
84 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
85 Copyright
<span class=
"trademark"></span>©
1991-
2006
86 Silicon Graphics, Inc. This document is licensed under the SGI
87 Free Software B License. For details, see
88 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
89 </p></div></div></body></html>