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renderer=
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"Content-Type" content=
"text/html; charset=UTF-8" /><title>glCopyPixels
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glCopyPixels"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glCopyPixels — copy pixels in the frame buffer
</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">glCopyPixels
</b>(
</code></td><td>GLint
</td><td><var class=
"pdparam">x
</var>,
</td></tr><tr><td> </td><td>GLint
</td><td><var class=
"pdparam">y
</var>,
</td></tr><tr><td> </td><td>GLsizei
</td><td><var class=
"pdparam">width
</var>,
</td></tr><tr><td> </td><td>GLsizei
</td><td><var class=
"pdparam">height
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">type
</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>x
</code></em>,
</span><span class=
"term"><em class=
"parameter"><code>y
</code></em></span></dt><dd><p>
4 Specify the window coordinates of the lower left corner
5 of the rectangular region of pixels to be copied.
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>width
</code></em>,
</span><span class=
"term"><em class=
"parameter"><code>height
</code></em></span></dt><dd><p>
7 Specify the dimensions of the rectangular region of pixels to be copied.
8 Both must be nonnegative.
9 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>type
</code></em></span></dt><dd><p>
10 Specifies whether color values,
12 or stencil values are to be copied.
14 <code class=
"constant">GL_COLOR
</code>,
15 <code class=
"constant">GL_DEPTH
</code>,
16 and
<code class=
"constant">GL_STENCIL
</code> are accepted.
17 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
18 <code class=
"function">glCopyPixels
</code> copies a screen-aligned rectangle of pixels
19 from the specified frame buffer location to a region relative to the
20 current raster position.
21 Its operation is well defined only if the entire pixel source region
22 is within the exposed portion of the window.
23 Results of copies from outside the window,
24 or from regions of the window that are not exposed,
25 are hardware dependent and undefined.
27 <em class=
"parameter"><code>x
</code></em> and
<em class=
"parameter"><code>y
</code></em> specify the window coordinates of
28 the lower left corner of the rectangular region to be copied.
29 <em class=
"parameter"><code>width
</code></em> and
<em class=
"parameter"><code>height
</code></em> specify the dimensions of the
30 rectangular region to be copied.
31 Both
<em class=
"parameter"><code>width
</code></em> and
<em class=
"parameter"><code>height
</code></em> must not be negative.
33 Several parameters control the processing of the pixel data
34 while it is being copied.
35 These parameters are set with three commands:
36 <a class=
"citerefentry" href=
"glPixelTransfer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPixelTransfer
</span></span></a>,
37 <a class=
"citerefentry" href=
"glPixelMap.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPixelMap
</span></span></a>, and
38 <a class=
"citerefentry" href=
"glPixelZoom.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPixelZoom
</span></span></a>.
39 This reference page describes the effects on
<code class=
"function">glCopyPixels
</code> of most,
40 but not all, of the parameters specified by these three commands.
42 <code class=
"function">glCopyPixels
</code> copies values from each pixel with the lower left-hand corner at
43 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
45 <mml:mfenced open=
"(" close=
")">
47 <mml:mi mathvariant=
"italic">x
</mml:mi>
49 <mml:mi mathvariant=
"italic">i
</mml:mi>
52 <mml:mi mathvariant=
"italic">y
</mml:mi>
54 <mml:mi mathvariant=
"italic">j
</mml:mi>
59 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
63 <mml:mo><=
</mml:mo>
64 <mml:mi mathvariant=
"italic">i
</mml:mi>
66 <mml:mi mathvariant=
"italic">width
</mml:mi>
70 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
74 <mml:mo><=
</mml:mo>
75 <mml:mi mathvariant=
"italic">j
</mml:mi>
77 <mml:mi mathvariant=
"italic">height
</mml:mi>
80 This pixel is said to be the
81 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">i
</mml:mi></mml:math>th
83 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">j
</mml:mi></mml:math>th
85 Pixels are copied in row order from the lowest to the highest row,
86 left to right in each row.
88 <em class=
"parameter"><code>type
</code></em> specifies whether color, depth, or stencil data is to be copied.
89 The details of the transfer for each data type are as follows:
90 </p><div class=
"variablelist"><dl><dt><span class=
"term"><code class=
"constant">GL_COLOR
</code></span></dt><dd><p>
91 Indices or RGBA colors are read from the buffer currently specified as the
92 read source buffer (see
<a class=
"citerefentry" href=
"glReadBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glReadBuffer
</span></span></a>).
93 If the GL is in color index mode,
94 each index that is read from this buffer is converted
95 to a fixed-point format with an unspecified
96 number of bits to the right of the binary point.
97 Each index is then shifted left by
<code class=
"constant">GL_INDEX_SHIFT
</code> bits,
98 and added to
<code class=
"constant">GL_INDEX_OFFSET
</code>.
99 If
<code class=
"constant">GL_INDEX_SHIFT
</code> is negative,
100 the shift is to the right.
101 In either case, zero bits fill otherwise unspecified bit locations in the
103 If
<code class=
"constant">GL_MAP_COLOR
</code> is true,
104 the index is replaced with the value that it references in lookup table
105 <code class=
"constant">GL_PIXEL_MAP_I_TO_I
</code>.
106 Whether the lookup replacement of the index is done or not,
107 the integer part of the index is then ANDed with
108 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
111 <mml:msup><mml:mn>2</mml:mn>
112 <mml:mi mathvariant=
"italic">b
</mml:mi>
119 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">b
</mml:mi></mml:math>
120 is the number of bits in a color index buffer.
122 If the GL is in RGBA mode,
123 the red, green, blue, and alpha components of each pixel that is read
124 are converted to an internal floating-point format with unspecified
126 The conversion maps the largest representable component value to
1.0,
127 and component value
0 to
0.0.
128 The resulting floating-point color values are then multiplied
129 by
<code class=
"constant">GL_c_SCALE
</code> and added to
<code class=
"constant">GL_c_BIAS
</code>,
130 where
<span class=
"emphasis"><em>c
</em></span> is RED, GREEN, BLUE, and ALPHA
131 for the respective color components.
132 The results are clamped to the range [
0,
1].
133 If
<code class=
"constant">GL_MAP_COLOR
</code> is true,
134 each color component is scaled by the size of lookup table
135 <code class=
"constant">GL_PIXEL_MAP_c_TO_c
</code>,
136 then replaced by the value that it references in that table.
137 <span class=
"emphasis"><em>c
</em></span> is R, G, B, or A.
139 If the
<code class=
"code">ARB_imaging
</code> extension is supported, the color values may
141 additionally processed by color-table lookups, color-matrix
142 transformations, and convolution filters.
144 The GL then converts the resulting indices or RGBA colors to fragments
145 by attaching the current raster position
<span class=
"emphasis"><em>z
</em></span> coordinate and
146 texture coordinates to each pixel,
147 then assigning window coordinates
148 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
150 <mml:mfenced open=
"(" close=
")">
152 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
153 <mml:mi mathvariant=
"italic">r
</mml:mi>
156 <mml:mi mathvariant=
"italic">i
</mml:mi>
159 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
160 <mml:mi mathvariant=
"italic">r
</mml:mi>
163 <mml:mi mathvariant=
"italic">j
</mml:mi>
168 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
170 <mml:mfenced open=
"(" close=
")">
171 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
172 <mml:mi mathvariant=
"italic">r
</mml:mi>
174 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
175 <mml:mi mathvariant=
"italic">r
</mml:mi>
179 is the current raster position,
180 and the pixel was the
181 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">i
</mml:mi></mml:math>th
183 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">j
</mml:mi></mml:math>th
185 These pixel fragments are then treated just like the fragments generated by
186 rasterizing points, lines, or polygons.
189 and all the fragment operations are applied before the fragments are written
191 </p></dd><dt><span class=
"term"><code class=
"constant">GL_DEPTH
</code></span></dt><dd><p>
192 Depth values are read from the depth buffer and
193 converted directly to an internal floating-point format
194 with unspecified precision.
195 The resulting floating-point depth value is then multiplied
196 by
<code class=
"constant">GL_DEPTH_SCALE
</code> and added to
<code class=
"constant">GL_DEPTH_BIAS
</code>.
197 The result is clamped to the range [
0,
1].
199 The GL then converts the resulting depth components to fragments
200 by attaching the current raster position color or color index and
201 texture coordinates to each pixel,
202 then assigning window coordinates
203 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
205 <mml:mfenced open=
"(" close=
")">
207 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
208 <mml:mi mathvariant=
"italic">r
</mml:mi>
211 <mml:mi mathvariant=
"italic">i
</mml:mi>
214 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
215 <mml:mi mathvariant=
"italic">r
</mml:mi>
218 <mml:mi mathvariant=
"italic">j
</mml:mi>
223 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
225 <mml:mfenced open=
"(" close=
")">
226 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
227 <mml:mi mathvariant=
"italic">r
</mml:mi>
229 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
230 <mml:mi mathvariant=
"italic">r
</mml:mi>
234 is the current raster position,
235 and the pixel was the
236 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">i
</mml:mi></mml:math>th
238 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">j
</mml:mi></mml:math>th
240 These pixel fragments are then treated just like the fragments generated by
241 rasterizing points, lines, or polygons.
244 and all the fragment operations are applied before the fragments are written
246 </p></dd><dt><span class=
"term"><code class=
"constant">GL_STENCIL
</code></span></dt><dd><p>
247 Stencil indices are read from the stencil buffer and
248 converted to an internal fixed-point format
249 with an unspecified number of bits to the right of the binary point.
250 Each fixed-point index is then shifted left by
<code class=
"constant">GL_INDEX_SHIFT
</code> bits,
251 and added to
<code class=
"constant">GL_INDEX_OFFSET
</code>.
252 If
<code class=
"constant">GL_INDEX_SHIFT
</code> is negative,
253 the shift is to the right.
254 In either case, zero bits fill otherwise unspecified bit locations in the
256 If
<code class=
"constant">GL_MAP_STENCIL
</code> is true,
257 the index is replaced with the value that it references in lookup table
258 <code class=
"constant">GL_PIXEL_MAP_S_TO_S
</code>.
259 Whether the lookup replacement of the index is done or not,
260 the integer part of the index is then ANDed with
261 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
264 <mml:msup><mml:mn>2</mml:mn>
265 <mml:mi mathvariant=
"italic">b
</mml:mi>
272 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">b
</mml:mi></mml:math>
273 is the number of bits in the stencil buffer.
274 The resulting stencil indices are then written to the stencil buffer
275 such that the index read from the
276 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">i
</mml:mi></mml:math>th
278 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">j
</mml:mi></mml:math>th
280 is written to location
281 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
283 <mml:mfenced open=
"(" close=
")">
285 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
286 <mml:mi mathvariant=
"italic">r
</mml:mi>
289 <mml:mi mathvariant=
"italic">i
</mml:mi>
292 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
293 <mml:mi mathvariant=
"italic">r
</mml:mi>
296 <mml:mi mathvariant=
"italic">j
</mml:mi>
301 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
303 <mml:mfenced open=
"(" close=
")">
304 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
305 <mml:mi mathvariant=
"italic">r
</mml:mi>
307 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
308 <mml:mi mathvariant=
"italic">r
</mml:mi>
312 is the current raster position.
313 Only the pixel ownership test,
315 and the stencil writemask affect these write operations.
316 </p></dd></dl></div><p>
317 The rasterization described thus far assumes pixel zoom factors of
1.0.
319 <a class=
"citerefentry" href=
"glPixelZoom.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPixelZoom
</span></span></a> is used to change the
320 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">x
</mml:mi></mml:math>
322 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">y
</mml:mi></mml:math>
324 pixels are converted to fragments as follows.
326 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
328 <mml:mfenced open=
"(" close=
")">
329 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
330 <mml:mi mathvariant=
"italic">r
</mml:mi>
332 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
333 <mml:mi mathvariant=
"italic">r
</mml:mi>
337 is the current raster position,
338 and a given pixel is in the
339 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">i
</mml:mi></mml:math>th
341 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">j
</mml:mi></mml:math>th
344 then fragments are generated for pixels whose centers are in the rectangle
347 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
349 <mml:mfenced open=
"(" close=
")">
351 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
352 <mml:mi mathvariant=
"italic">r
</mml:mi>
355 <mml:mfenced open=
"" close=
"">
356 <mml:msub><mml:mi mathvariant=
"italic">zoom
</mml:mi>
357 <mml:mi mathvariant=
"italic">x
</mml:mi>
361 <mml:mi mathvariant=
"italic">i
</mml:mi>
364 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
365 <mml:mi mathvariant=
"italic">r
</mml:mi>
368 <mml:mfenced open=
"" close=
"">
369 <mml:msub><mml:mi mathvariant=
"italic">zoom
</mml:mi>
370 <mml:mi mathvariant=
"italic">y
</mml:mi>
374 <mml:mi mathvariant=
"italic">j
</mml:mi>
381 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
383 <mml:mfenced open=
"(" close=
")">
385 <mml:msub><mml:mi mathvariant=
"italic">x
</mml:mi>
386 <mml:mi mathvariant=
"italic">r
</mml:mi>
390 <mml:mfenced open=
"" close=
"">
391 <mml:msub><mml:mi mathvariant=
"italic">zoom
</mml:mi>
392 <mml:mi mathvariant=
"italic">x
</mml:mi>
396 <mml:mfenced open=
"(" close=
")">
398 <mml:mi mathvariant=
"italic">i
</mml:mi>
406 <mml:msub><mml:mi mathvariant=
"italic">y
</mml:mi>
407 <mml:mi mathvariant=
"italic">r
</mml:mi>
411 <mml:mfenced open=
"" close=
"">
412 <mml:msub><mml:mi mathvariant=
"italic">zoom
</mml:mi>
413 <mml:mi mathvariant=
"italic">y
</mml:mi>
417 <mml:mfenced open=
"(" close=
")">
419 <mml:mi mathvariant=
"italic">j
</mml:mi>
430 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
432 <mml:msub><mml:mi mathvariant=
"italic">zoom
</mml:mi>
433 <mml:mi mathvariant=
"italic">x
</mml:mi>
436 is the value of
<code class=
"constant">GL_ZOOM_X
</code> and
437 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
439 <mml:msub><mml:mi mathvariant=
"italic">zoom
</mml:mi>
440 <mml:mi mathvariant=
"italic">y
</mml:mi>
443 is the value of
<code class=
"constant">GL_ZOOM_Y
</code>.
444 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"examples"></a><h2>Examples
</h2><p>
445 To copy the color pixel in the lower left corner of the window to the current raster position,
448 </p><pre class=
"programlisting">
449 glCopyPixels(
0,
0,
1,
1,
<code class=
"constant">GL_COLOR
</code>);
452 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
453 Modes specified by
<a class=
"citerefentry" href=
"glPixelStore.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPixelStore
</span></span></a> have no effect on the operation
454 of
<code class=
"function">glCopyPixels
</code>.
455 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
456 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>type
</code></em> is not an accepted value.
458 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if either
<em class=
"parameter"><code>width
</code></em> or
<em class=
"parameter"><code>height
</code></em> is negative.
460 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<em class=
"parameter"><code>type
</code></em> is
<code class=
"constant">GL_DEPTH
</code>
461 and there is no depth buffer.
463 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<em class=
"parameter"><code>type
</code></em> is
<code class=
"constant">GL_STENCIL
</code>
464 and there is no stencil buffer.
466 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<code class=
"function">glCopyPixels
</code>
467 is executed between the execution of
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a>
468 and the corresponding execution of
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a>.
469 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
470 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_CURRENT_RASTER_POSITION
</code>
472 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_CURRENT_RASTER_POSITION_VALID
</code>
473 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
474 <a class=
"citerefentry" href=
"glColorTable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glColorTable
</span></span></a>,
475 <a class=
"citerefentry" href=
"glConvolutionFilter1D.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glConvolutionFilter1D
</span></span></a>,
476 <a class=
"citerefentry" href=
"glConvolutionFilter2D.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glConvolutionFilter2D
</span></span></a>,
477 <a class=
"citerefentry" href=
"glDepthFunc.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDepthFunc
</span></span></a>,
478 <a class=
"citerefentry" href=
"glDrawBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawBuffer
</span></span></a>,
479 <a class=
"citerefentry" href=
"glDrawPixels.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawPixels
</span></span></a>,
480 <a class=
"citerefentry" href=
"glMatrixMode.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMatrixMode
</span></span></a>,
481 <a class=
"citerefentry" href=
"glPixelMap.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPixelMap
</span></span></a>,
482 <a class=
"citerefentry" href=
"glPixelTransfer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPixelTransfer
</span></span></a>,
483 <a class=
"citerefentry" href=
"glPixelZoom.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPixelZoom
</span></span></a>,
484 <a class=
"citerefentry" href=
"glRasterPos.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glRasterPos
</span></span></a>,
485 <a class=
"citerefentry" href=
"glReadBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glReadBuffer
</span></span></a>,
486 <a class=
"citerefentry" href=
"glReadPixels.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glReadPixels
</span></span></a>,
487 <a class=
"citerefentry" href=
"glSeparableFilter2D.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glSeparableFilter2D
</span></span></a>,
488 <a class=
"citerefentry" href=
"glStencilFunc.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilFunc
</span></span></a>,
489 <a class=
"citerefentry" href=
"glWindowPos.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glWindowPos
</span></span></a>
490 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
491 Copyright
<span class=
"trademark"></span>©
1991-
2006
492 Silicon Graphics, Inc. This document is licensed under the SGI
493 Free Software B License. For details, see
494 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
495 </p></div></div></body></html>