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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
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3 | <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glPixelStore</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glPixelStore"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glPixelStore — set pixel storage modes</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">glPixelStoref</b>(</code></td><td>GLenum </td><td><var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">param</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">glPixelStorei</b>(</code></td><td>GLenum </td><td><var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">param</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>pname</code></em></span></dt><dd><p> | |
4 | Specifies the symbolic name of the parameter to be set. | |
5 | Six values affect the packing of pixel data into memory: | |
6 | <code class="constant">GL_PACK_SWAP_BYTES</code>, | |
7 | <code class="constant">GL_PACK_LSB_FIRST</code>, | |
8 | <code class="constant">GL_PACK_ROW_LENGTH</code>, | |
9 | <code class="constant">GL_PACK_IMAGE_HEIGHT</code>, | |
10 | <code class="constant">GL_PACK_SKIP_PIXELS</code>, | |
11 | <code class="constant">GL_PACK_SKIP_ROWS</code>, | |
12 | <code class="constant">GL_PACK_SKIP_IMAGES</code>, and | |
13 | <code class="constant">GL_PACK_ALIGNMENT</code>. | |
14 | Six more affect the unpacking of pixel data <span class="emphasis"><em>from</em></span> memory: | |
15 | <code class="constant">GL_UNPACK_SWAP_BYTES</code>, | |
16 | <code class="constant">GL_UNPACK_LSB_FIRST</code>, | |
17 | <code class="constant">GL_UNPACK_ROW_LENGTH</code>, | |
18 | <code class="constant">GL_UNPACK_IMAGE_HEIGHT</code>, | |
19 | <code class="constant">GL_UNPACK_SKIP_PIXELS</code>, | |
20 | <code class="constant">GL_UNPACK_SKIP_ROWS</code>, | |
21 | <code class="constant">GL_UNPACK_SKIP_IMAGES</code>, and | |
22 | <code class="constant">GL_UNPACK_ALIGNMENT</code>. | |
23 | </p></dd><dt><span class="term"><em class="parameter"><code>param</code></em></span></dt><dd><p> | |
24 | Specifies the value that <em class="parameter"><code>pname</code></em> is set to. | |
25 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
26 | <code class="function">glPixelStore</code> sets pixel storage modes that affect the operation of subsequent | |
27 | <a class="citerefentry" href="glDrawPixels.xml"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a> and <a class="citerefentry" href="glReadPixels.xml"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a> as well as the unpacking of | |
28 | polygon stipple patterns (see <a class="citerefentry" href="glPolygonStipple.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonStipple</span></span></a>), bitmaps (see | |
29 | <a class="citerefentry" href="glBitmap.xml"><span class="citerefentry"><span class="refentrytitle">glBitmap</span></span></a>), texture patterns (see <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>, | |
30 | <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>, <a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>, | |
31 | <a class="citerefentry" href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, <a class="citerefentry" href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>). | |
32 | Additionally, if the <code class="code">ARB_imaging</code> extension is supported, pixel | |
33 | storage modes affect convolution filters | |
34 | (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>, and | |
35 | <a class="citerefentry" href="glSeparableFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glSeparableFilter2D</span></span></a>, color table (see <a class="citerefentry" href="glColorTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>, and | |
36 | <a class="citerefentry" href="glColorSubTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorSubTable</span></span></a>, and unpacking histogram (See <a class="citerefentry" href="glHistogram.xml"><span class="citerefentry"><span class="refentrytitle">glHistogram</span></span></a>), | |
37 | and minmax (See <a class="citerefentry" href="glMinmax.xml"><span class="citerefentry"><span class="refentrytitle">glMinmax</span></span></a>) data. | |
38 | </p><p> | |
39 | <em class="parameter"><code>pname</code></em> is a symbolic constant indicating the parameter to be set, and | |
40 | <em class="parameter"><code>param</code></em> is the new value. Six of the twelve storage parameters affect | |
41 | how pixel data is returned to client memory. | |
42 | They are as follows: | |
43 | </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GL_PACK_SWAP_BYTES</code></span></dt><dd><p> | |
44 | If true, | |
45 | byte ordering for multibyte color components, | |
46 | depth components, | |
47 | color indices, | |
48 | or stencil indices | |
49 | is reversed. | |
50 | That is, | |
51 | if a four-byte component consists of bytes | |
52 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
53 | ||
54 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
55 | <mml:mn>0</mml:mn> | |
56 | </mml:msub> | |
57 | </mml:math>, | |
58 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
59 | ||
60 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
61 | <mml:mn>1</mml:mn> | |
62 | </mml:msub> | |
63 | </mml:math>, | |
64 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
65 | ||
66 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
67 | <mml:mn>2</mml:mn> | |
68 | </mml:msub> | |
69 | </mml:math>, | |
70 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
71 | ||
72 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
73 | <mml:mn>3</mml:mn> | |
74 | </mml:msub> | |
75 | </mml:math>, | |
76 | it is stored in memory as | |
77 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
78 | ||
79 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
80 | <mml:mn>3</mml:mn> | |
81 | </mml:msub> | |
82 | </mml:math>, | |
83 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
84 | ||
85 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
86 | <mml:mn>2</mml:mn> | |
87 | </mml:msub> | |
88 | </mml:math>, | |
89 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
90 | ||
91 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
92 | <mml:mn>1</mml:mn> | |
93 | </mml:msub> | |
94 | </mml:math>, | |
95 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
96 | ||
97 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
98 | <mml:mn>0</mml:mn> | |
99 | </mml:msub> | |
100 | </mml:math> | |
101 | if <code class="constant">GL_PACK_SWAP_BYTES</code> is true. | |
102 | <code class="constant">GL_PACK_SWAP_BYTES</code> has no effect on the memory order of components | |
103 | within a pixel, | |
104 | only on the order of bytes within components or indices. | |
105 | For example, | |
106 | the three components of a <code class="constant">GL_RGB</code> format pixel are always stored with | |
107 | red first, | |
108 | green second, | |
109 | and blue third, | |
110 | regardless of the value of <code class="constant">GL_PACK_SWAP_BYTES</code>. | |
111 | </p></dd><dt><span class="term"><code class="constant">GL_PACK_LSB_FIRST</code></span></dt><dd><p> | |
112 | If true, | |
113 | bits are ordered within a byte from least significant to most significant; | |
114 | otherwise, | |
115 | the first bit in each byte is the most significant one. | |
116 | This parameter is significant for bitmap data only. | |
117 | </p></dd><dt><span class="term"><code class="constant">GL_PACK_ROW_LENGTH</code></span></dt><dd><p> | |
118 | If greater than 0, | |
119 | <code class="constant">GL_PACK_ROW_LENGTH</code> defines the number of pixels in a row. | |
120 | If the first pixel of a row is placed at location | |
121 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">p</mml:mi></mml:math> | |
122 | in memory, | |
123 | then the location of the first pixel of the next row is obtained by skipping | |
124 | </p><p> | |
125 | </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
126 | ||
127 | <mml:mrow> | |
128 | <mml:mi mathvariant="italic">k</mml:mi> | |
129 | <mml:mo>=</mml:mo> | |
130 | <mml:mfenced open="{" close=""> | |
131 | <mml:mrow> | |
132 | <mml:mtable> | |
133 | <mml:mtr><mml:mtd> | |
134 | <mml:mrow> | |
135 | <mml:mi mathvariant="italic">n</mml:mi> | |
136 | <mml:mo></mml:mo> | |
137 | <mml:mi mathvariant="italic">l</mml:mi> | |
138 | </mml:mrow> | |
139 | </mml:mtd></mml:mtr> | |
140 | <mml:mtr><mml:mtd> | |
141 | <mml:mrow> | |
142 | <mml:mfenced open="" close=""> | |
143 | <mml:mfrac> | |
144 | <mml:mi mathvariant="italic">a</mml:mi> | |
145 | <mml:mi mathvariant="italic">s</mml:mi> | |
146 | </mml:mfrac> | |
147 | </mml:mfenced> | |
148 | <mml:mo></mml:mo> | |
149 | <mml:mfenced open="⌈" close="⌉"> | |
150 | <mml:mfrac> | |
151 | <mml:mfenced open="" close=""> | |
152 | <mml:mrow> | |
153 | <mml:mi mathvariant="italic">s</mml:mi> | |
154 | <mml:mo></mml:mo> | |
155 | <mml:mi mathvariant="italic">n</mml:mi> | |
156 | <mml:mo></mml:mo> | |
157 | <mml:mi mathvariant="italic">l</mml:mi> | |
158 | </mml:mrow> | |
159 | </mml:mfenced> | |
160 | <mml:mi mathvariant="italic">a</mml:mi> | |
161 | </mml:mfrac> | |
162 | </mml:mfenced> | |
163 | </mml:mrow> | |
164 | </mml:mtd></mml:mtr> | |
165 | </mml:mtable> | |
166 | <mml:mo></mml:mo> | |
167 | <mml:mtable> | |
168 | <mml:mtr><mml:mtd> | |
169 | <mml:mrow> | |
170 | <mml:mi mathvariant="italic">s</mml:mi> | |
171 | <mml:mo>>=</mml:mo> | |
172 | <mml:mi mathvariant="italic">a</mml:mi> | |
173 | </mml:mrow> | |
174 | </mml:mtd></mml:mtr> | |
175 | <mml:mtr><mml:mtd> | |
176 | <mml:mrow> | |
177 | <mml:mi mathvariant="italic">s</mml:mi> | |
178 | <mml:mo><</mml:mo> | |
179 | <mml:mi mathvariant="italic">a</mml:mi> | |
180 | </mml:mrow> | |
181 | </mml:mtd></mml:mtr> | |
182 | </mml:mtable> | |
183 | </mml:mrow> | |
184 | </mml:mfenced> | |
185 | </mml:mrow> | |
186 | </mml:math></div><p> | |
187 | </p><p> | |
188 | components or indices, | |
189 | where | |
190 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">n</mml:mi></mml:math> | |
191 | is the number of components or indices in a pixel, | |
192 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">l</mml:mi></mml:math> | |
193 | is the number of pixels in a row | |
194 | (<code class="constant">GL_PACK_ROW_LENGTH</code> if it is greater than 0, | |
195 | the | |
196 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">width</mml:mi></mml:math> | |
197 | argument to the pixel routine otherwise), | |
198 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">a</mml:mi></mml:math> | |
199 | is the value of <code class="constant">GL_PACK_ALIGNMENT</code>, and | |
200 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math> | |
201 | is the size, in bytes, of a single component | |
202 | (if | |
203 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
204 | ||
205 | <mml:mrow> | |
206 | <mml:mi mathvariant="italic">a</mml:mi> | |
207 | <mml:mo><</mml:mo> | |
208 | <mml:mi mathvariant="italic">s</mml:mi> | |
209 | </mml:mrow> | |
210 | </mml:math>, | |
211 | then it is as if | |
212 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
213 | ||
214 | <mml:mrow> | |
215 | <mml:mi mathvariant="italic">a</mml:mi> | |
216 | <mml:mo>=</mml:mo> | |
217 | <mml:mi mathvariant="italic">s</mml:mi> | |
218 | </mml:mrow> | |
219 | </mml:math>). | |
220 | In the case of 1-bit values, | |
221 | the location of the next row is obtained by skipping | |
222 | </p><p> | |
223 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
224 | ||
225 | <mml:mrow> | |
226 | <mml:mi mathvariant="italic">k</mml:mi> | |
227 | <mml:mo>=</mml:mo> | |
228 | <mml:mrow> | |
229 | <mml:mn>8</mml:mn> | |
230 | <mml:mo></mml:mo> | |
231 | <mml:mi mathvariant="italic">a</mml:mi> | |
232 | <mml:mo></mml:mo> | |
233 | <mml:mfenced open="⌈" close="⌉"> | |
234 | <mml:mfrac> | |
235 | <mml:mfenced open="" close=""> | |
236 | <mml:mrow> | |
237 | <mml:mi mathvariant="italic">n</mml:mi> | |
238 | <mml:mo></mml:mo> | |
239 | <mml:mi mathvariant="italic">l</mml:mi> | |
240 | </mml:mrow> | |
241 | </mml:mfenced> | |
242 | <mml:mfenced open="" close=""> | |
243 | <mml:mrow> | |
244 | <mml:mn>8</mml:mn> | |
245 | <mml:mo></mml:mo> | |
246 | <mml:mi mathvariant="italic">a</mml:mi> | |
247 | </mml:mrow> | |
248 | </mml:mfenced> | |
249 | </mml:mfrac> | |
250 | </mml:mfenced> | |
251 | </mml:mrow> | |
252 | </mml:mrow> | |
253 | </mml:math> | |
254 | </p><p> | |
255 | components or indices. | |
256 | </p><p> | |
257 | The word <span class="emphasis"><em>component</em></span> in this description refers to the nonindex values | |
258 | red, | |
259 | green, | |
260 | blue, | |
261 | alpha, | |
262 | and depth. | |
263 | Storage format <code class="constant">GL_RGB</code>, | |
264 | for example, | |
265 | has three components per pixel: | |
266 | first red, | |
267 | then green, | |
268 | and finally blue. | |
269 | </p></dd><dt><span class="term"><code class="constant">GL_PACK_IMAGE_HEIGHT</code></span></dt><dd><p> | |
270 | If greater than 0, | |
271 | <code class="constant">GL_PACK_IMAGE_HEIGHT</code> defines the number of pixels in an image | |
272 | three-dimensional texture volume, where ``image'' is defined by all pixels | |
273 | sharing the same third dimension index. | |
274 | If the first pixel of a row is placed at location | |
275 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">p</mml:mi></mml:math> | |
276 | in memory, | |
277 | then the location of the first pixel of the next row is obtained by skipping | |
278 | </p><p> | |
279 | </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
280 | ||
281 | <mml:mrow> | |
282 | <mml:mi mathvariant="italic">k</mml:mi> | |
283 | <mml:mo>=</mml:mo> | |
284 | <mml:mfenced open="{" close=""> | |
285 | <mml:mrow> | |
286 | <mml:mtable> | |
287 | <mml:mtr><mml:mtd> | |
288 | <mml:mrow> | |
289 | <mml:mi mathvariant="italic">n</mml:mi> | |
290 | <mml:mo></mml:mo> | |
291 | <mml:mi mathvariant="italic">l</mml:mi> | |
292 | <mml:mo></mml:mo> | |
293 | <mml:mi mathvariant="italic">h</mml:mi> | |
294 | </mml:mrow> | |
295 | </mml:mtd></mml:mtr> | |
296 | <mml:mtr><mml:mtd> | |
297 | <mml:mrow> | |
298 | <mml:mfenced open="" close=""> | |
299 | <mml:mfrac> | |
300 | <mml:mi mathvariant="italic">a</mml:mi> | |
301 | <mml:mi mathvariant="italic">s</mml:mi> | |
302 | </mml:mfrac> | |
303 | </mml:mfenced> | |
304 | <mml:mo></mml:mo> | |
305 | <mml:mfenced open="⌈" close="⌉"> | |
306 | <mml:mfrac> | |
307 | <mml:mfenced open="" close=""> | |
308 | <mml:mrow> | |
309 | <mml:mi mathvariant="italic">s</mml:mi> | |
310 | <mml:mo></mml:mo> | |
311 | <mml:mi mathvariant="italic">n</mml:mi> | |
312 | <mml:mo></mml:mo> | |
313 | <mml:mi mathvariant="italic">l</mml:mi> | |
314 | <mml:mo></mml:mo> | |
315 | <mml:mi mathvariant="italic">h</mml:mi> | |
316 | </mml:mrow> | |
317 | </mml:mfenced> | |
318 | <mml:mi mathvariant="italic">a</mml:mi> | |
319 | </mml:mfrac> | |
320 | </mml:mfenced> | |
321 | </mml:mrow> | |
322 | </mml:mtd></mml:mtr> | |
323 | </mml:mtable> | |
324 | <mml:mo></mml:mo> | |
325 | <mml:mtable> | |
326 | <mml:mtr><mml:mtd> | |
327 | <mml:mrow> | |
328 | <mml:mi mathvariant="italic">s</mml:mi> | |
329 | <mml:mo>>=</mml:mo> | |
330 | <mml:mi mathvariant="italic">a</mml:mi> | |
331 | </mml:mrow> | |
332 | </mml:mtd></mml:mtr> | |
333 | <mml:mtr><mml:mtd> | |
334 | <mml:mrow> | |
335 | <mml:mi mathvariant="italic">s</mml:mi> | |
336 | <mml:mo><</mml:mo> | |
337 | <mml:mi mathvariant="italic">a</mml:mi> | |
338 | </mml:mrow> | |
339 | </mml:mtd></mml:mtr> | |
340 | </mml:mtable> | |
341 | </mml:mrow> | |
342 | </mml:mfenced> | |
343 | </mml:mrow> | |
344 | </mml:math></div><p> | |
345 | </p><p> | |
346 | components or indices, where | |
347 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">n</mml:mi></mml:math> | |
348 | is the number of components or indices | |
349 | in a pixel, | |
350 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">l</mml:mi></mml:math> | |
351 | is the number of pixels in a row | |
352 | (<code class="constant">GL_PACK_ROW_LENGTH</code> if it is greater than 0, the | |
353 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">width</mml:mi></mml:math> | |
354 | argument to <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a> otherwise), | |
355 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">h</mml:mi></mml:math> | |
356 | is the number of | |
357 | rows in a pixel image (<code class="constant">GL_PACK_IMAGE_HEIGHT</code> if it is greater than | |
358 | 0, the | |
359 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">height</mml:mi></mml:math> | |
360 | argument to the <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a> routine otherwise), | |
361 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">a</mml:mi></mml:math> | |
362 | is the value of | |
363 | <code class="constant">GL_PACK_ALIGNMENT</code>, and | |
364 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math> | |
365 | is the size, in bytes, of a single | |
366 | component (if | |
367 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
368 | ||
369 | <mml:mrow> | |
370 | <mml:mi mathvariant="italic">a</mml:mi> | |
371 | <mml:mo><</mml:mo> | |
372 | <mml:mi mathvariant="italic">s</mml:mi> | |
373 | </mml:mrow> | |
374 | </mml:math>, | |
375 | then it is as if | |
376 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
377 | ||
378 | <mml:mrow> | |
379 | <mml:mi mathvariant="italic">a</mml:mi> | |
380 | <mml:mo>=</mml:mo> | |
381 | <mml:mi mathvariant="italic">s</mml:mi> | |
382 | </mml:mrow> | |
383 | </mml:math>). | |
384 | </p><p> | |
385 | The word <span class="emphasis"><em>component</em></span> in this description refers to the nonindex values | |
386 | red, | |
387 | green, | |
388 | blue, | |
389 | alpha, | |
390 | and depth. | |
391 | Storage format <code class="constant">GL_RGB</code>, | |
392 | for example, | |
393 | has three components per pixel: | |
394 | first red, | |
395 | then green, | |
396 | and finally blue. | |
397 | </p></dd><dt><span class="term"><code class="constant">GL_PACK_SKIP_PIXELS</code>, <code class="constant">GL_PACK_SKIP_ROWS</code>, and <code class="constant">GL_PACK_SKIP_IMAGES</code></span></dt><dd><p> | |
398 | These values are provided as a convenience to the programmer; | |
399 | they provide no functionality that cannot be duplicated simply by | |
400 | incrementing the pointer passed to <a class="citerefentry" href="glReadPixels.xml"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>. | |
401 | Setting <code class="constant">GL_PACK_SKIP_PIXELS</code> to | |
402 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math> | |
403 | is equivalent to incrementing | |
404 | the pointer by | |
405 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
406 | ||
407 | <mml:mrow> | |
408 | <mml:mi mathvariant="italic">i</mml:mi> | |
409 | <mml:mo></mml:mo> | |
410 | <mml:mi mathvariant="italic">n</mml:mi> | |
411 | </mml:mrow> | |
412 | </mml:math> | |
413 | components or indices, | |
414 | where | |
415 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">n</mml:mi></mml:math> | |
416 | is the number of components or indices in each pixel. | |
417 | Setting <code class="constant">GL_PACK_SKIP_ROWS</code> to | |
418 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math> | |
419 | is equivalent to incrementing | |
420 | the pointer by | |
421 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
422 | ||
423 | <mml:mrow> | |
424 | <mml:mi mathvariant="italic">j</mml:mi> | |
425 | <mml:mo></mml:mo> | |
426 | <mml:mi mathvariant="italic">m</mml:mi> | |
427 | </mml:mrow> | |
428 | </mml:math> | |
429 | components or indices, | |
430 | where | |
431 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">m</mml:mi></mml:math> | |
432 | is the number of components or indices per row, | |
433 | as just computed in the <code class="constant">GL_PACK_ROW_LENGTH</code> section. | |
434 | Setting <code class="constant">GL_PACK_SKIP_IMAGES</code> to | |
435 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">k</mml:mi></mml:math> | |
436 | is equivalent to incrementing | |
437 | the pointer by | |
438 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
439 | ||
440 | <mml:mrow> | |
441 | <mml:mi mathvariant="italic">k</mml:mi> | |
442 | <mml:mo></mml:mo> | |
443 | <mml:mi mathvariant="italic">p</mml:mi> | |
444 | </mml:mrow> | |
445 | </mml:math>, | |
446 | where | |
447 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">p</mml:mi></mml:math> | |
448 | is the number of components or indices | |
449 | per image, as computed in the <code class="constant">GL_PACK_IMAGE_HEIGHT</code> section. | |
450 | </p></dd><dt><span class="term"><code class="constant">GL_PACK_ALIGNMENT</code></span></dt><dd><p> | |
451 | Specifies the alignment requirements for the start of each pixel row in memory. | |
452 | The allowable values are | |
453 | 1 (byte-alignment), | |
454 | 2 (rows aligned to even-numbered bytes), | |
455 | 4 (word-alignment), and | |
456 | 8 (rows start on double-word boundaries). | |
457 | </p></dd></dl></div><p> | |
458 | The other six of the twelve storage parameters affect how pixel data is | |
459 | read from client memory. | |
460 | These values are significant for <a class="citerefentry" href="glDrawPixels.xml"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>, | |
461 | <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>, | |
462 | <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, | |
463 | <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>, | |
464 | <a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>, | |
465 | <a class="citerefentry" href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, | |
466 | <a class="citerefentry" href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>, | |
467 | <a class="citerefentry" href="glBitmap.xml"><span class="citerefentry"><span class="refentrytitle">glBitmap</span></span></a>, and | |
468 | <a class="citerefentry" href="glPolygonStipple.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonStipple</span></span></a>. | |
469 | </p><p> | |
470 | Additionally, if the <code class="code">ARB_imaging</code> extension is supported, | |
471 | <a class="citerefentry" href="glColorTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>, | |
472 | <a class="citerefentry" href="glColorSubTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorSubTable</span></span></a>, | |
473 | <a class="citerefentry" href="glConvolutionFilter1D.xml"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter1D</span></span></a>, | |
474 | <a class="citerefentry" href="glConvolutionFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter2D</span></span></a>, and | |
475 | <a class="citerefentry" href="glSeparableFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glSeparableFilter2D</span></span></a>. | |
476 | They are as follows: | |
477 | </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GL_UNPACK_SWAP_BYTES</code></span></dt><dd><p> | |
478 | If true, | |
479 | byte ordering for multibyte color components, | |
480 | depth components, | |
481 | color indices, | |
482 | or stencil indices | |
483 | is reversed. | |
484 | That is, | |
485 | if a four-byte component consists of bytes | |
486 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
487 | ||
488 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
489 | <mml:mn>0</mml:mn> | |
490 | </mml:msub> | |
491 | </mml:math>, | |
492 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
493 | ||
494 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
495 | <mml:mn>1</mml:mn> | |
496 | </mml:msub> | |
497 | </mml:math>, | |
498 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
499 | ||
500 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
501 | <mml:mn>2</mml:mn> | |
502 | </mml:msub> | |
503 | </mml:math>, | |
504 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
505 | ||
506 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
507 | <mml:mn>3</mml:mn> | |
508 | </mml:msub> | |
509 | </mml:math>, | |
510 | it is taken from memory as | |
511 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
512 | ||
513 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
514 | <mml:mn>3</mml:mn> | |
515 | </mml:msub> | |
516 | </mml:math>, | |
517 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
518 | ||
519 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
520 | <mml:mn>2</mml:mn> | |
521 | </mml:msub> | |
522 | </mml:math>, | |
523 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
524 | ||
525 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
526 | <mml:mn>1</mml:mn> | |
527 | </mml:msub> | |
528 | </mml:math>, | |
529 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
530 | ||
531 | <mml:msub><mml:mi mathvariant="italic">b</mml:mi> | |
532 | <mml:mn>0</mml:mn> | |
533 | </mml:msub> | |
534 | </mml:math> | |
535 | if <code class="constant">GL_UNPACK_SWAP_BYTES</code> is true. | |
536 | <code class="constant">GL_UNPACK_SWAP_BYTES</code> has no effect on the memory order of components | |
537 | within a pixel, | |
538 | only on the order of bytes within components or indices. | |
539 | For example, | |
540 | the three components of a <code class="constant">GL_RGB</code> format pixel are always stored with | |
541 | red first, | |
542 | green second, | |
543 | and blue third, | |
544 | regardless of the value of <code class="constant">GL_UNPACK_SWAP_BYTES</code>. | |
545 | </p></dd><dt><span class="term"><code class="constant">GL_UNPACK_LSB_FIRST</code></span></dt><dd><p> | |
546 | If true, | |
547 | bits are ordered within a byte from least significant to most significant; | |
548 | otherwise, | |
549 | the first bit in each byte is the most significant one. | |
550 | This is relevant only for bitmap data. | |
551 | </p></dd><dt><span class="term"><code class="constant">GL_UNPACK_ROW_LENGTH</code></span></dt><dd><p> | |
552 | If greater than 0, | |
553 | <code class="constant">GL_UNPACK_ROW_LENGTH</code> defines the number of pixels in a row. | |
554 | If the first pixel of a row is placed at location | |
555 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">p</mml:mi></mml:math> | |
556 | in memory, | |
557 | then the location of the first pixel of the next row is obtained by skipping | |
558 | </p><p> | |
559 | </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
560 | ||
561 | <mml:mrow> | |
562 | <mml:mi mathvariant="italic">k</mml:mi> | |
563 | <mml:mo>=</mml:mo> | |
564 | <mml:mfenced open="{" close=""> | |
565 | <mml:mrow> | |
566 | <mml:mtable> | |
567 | <mml:mtr><mml:mtd> | |
568 | <mml:mrow> | |
569 | <mml:mi mathvariant="italic">n</mml:mi> | |
570 | <mml:mo></mml:mo> | |
571 | <mml:mi mathvariant="italic">l</mml:mi> | |
572 | </mml:mrow> | |
573 | </mml:mtd></mml:mtr> | |
574 | <mml:mtr><mml:mtd> | |
575 | <mml:mrow> | |
576 | <mml:mfenced open="" close=""> | |
577 | <mml:mfrac> | |
578 | <mml:mi mathvariant="italic">a</mml:mi> | |
579 | <mml:mi mathvariant="italic">s</mml:mi> | |
580 | </mml:mfrac> | |
581 | </mml:mfenced> | |
582 | <mml:mo></mml:mo> | |
583 | <mml:mfenced open="⌈" close="⌉"> | |
584 | <mml:mfrac> | |
585 | <mml:mfenced open="" close=""> | |
586 | <mml:mrow> | |
587 | <mml:mi mathvariant="italic">s</mml:mi> | |
588 | <mml:mo></mml:mo> | |
589 | <mml:mi mathvariant="italic">n</mml:mi> | |
590 | <mml:mo></mml:mo> | |
591 | <mml:mi mathvariant="italic">l</mml:mi> | |
592 | </mml:mrow> | |
593 | </mml:mfenced> | |
594 | <mml:mi mathvariant="italic">a</mml:mi> | |
595 | </mml:mfrac> | |
596 | </mml:mfenced> | |
597 | </mml:mrow> | |
598 | </mml:mtd></mml:mtr> | |
599 | </mml:mtable> | |
600 | <mml:mo></mml:mo> | |
601 | <mml:mtable> | |
602 | <mml:mtr><mml:mtd> | |
603 | <mml:mrow> | |
604 | <mml:mi mathvariant="italic">s</mml:mi> | |
605 | <mml:mo>>=</mml:mo> | |
606 | <mml:mi mathvariant="italic">a</mml:mi> | |
607 | </mml:mrow> | |
608 | </mml:mtd></mml:mtr> | |
609 | <mml:mtr><mml:mtd> | |
610 | <mml:mrow> | |
611 | <mml:mi mathvariant="italic">s</mml:mi> | |
612 | <mml:mo><</mml:mo> | |
613 | <mml:mi mathvariant="italic">a</mml:mi> | |
614 | </mml:mrow> | |
615 | </mml:mtd></mml:mtr> | |
616 | </mml:mtable> | |
617 | </mml:mrow> | |
618 | </mml:mfenced> | |
619 | </mml:mrow> | |
620 | </mml:math></div><p> | |
621 | </p><p> | |
622 | components or indices, | |
623 | where | |
624 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">n</mml:mi></mml:math> | |
625 | is the number of components or indices in a pixel, | |
626 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">l</mml:mi></mml:math> | |
627 | is the number of pixels in a row | |
628 | (<code class="constant">GL_UNPACK_ROW_LENGTH</code> if it is greater than 0, | |
629 | the | |
630 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">width</mml:mi></mml:math> | |
631 | argument to the pixel routine otherwise), | |
632 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">a</mml:mi></mml:math> | |
633 | is the value of <code class="constant">GL_UNPACK_ALIGNMENT</code>, and | |
634 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math> | |
635 | is the size, in bytes, of a single component | |
636 | (if | |
637 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
638 | ||
639 | <mml:mrow> | |
640 | <mml:mi mathvariant="italic">a</mml:mi> | |
641 | <mml:mo><</mml:mo> | |
642 | <mml:mi mathvariant="italic">s</mml:mi> | |
643 | </mml:mrow> | |
644 | </mml:math>, | |
645 | then it is as if | |
646 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
647 | ||
648 | <mml:mrow> | |
649 | <mml:mi mathvariant="italic">a</mml:mi> | |
650 | <mml:mo>=</mml:mo> | |
651 | <mml:mi mathvariant="italic">s</mml:mi> | |
652 | </mml:mrow> | |
653 | </mml:math>). | |
654 | In the case of 1-bit values, | |
655 | the location of the next row is obtained by skipping | |
656 | </p><p> | |
657 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
658 | ||
659 | <mml:mrow> | |
660 | <mml:mi mathvariant="italic">k</mml:mi> | |
661 | <mml:mo>=</mml:mo> | |
662 | <mml:mrow> | |
663 | <mml:mn>8</mml:mn> | |
664 | <mml:mo></mml:mo> | |
665 | <mml:mi mathvariant="italic">a</mml:mi> | |
666 | <mml:mo></mml:mo> | |
667 | <mml:mfenced open="⌈" close="⌉"> | |
668 | <mml:mfrac> | |
669 | <mml:mfenced open="" close=""> | |
670 | <mml:mrow> | |
671 | <mml:mi mathvariant="italic">n</mml:mi> | |
672 | <mml:mo></mml:mo> | |
673 | <mml:mi mathvariant="italic">l</mml:mi> | |
674 | </mml:mrow> | |
675 | </mml:mfenced> | |
676 | <mml:mfenced open="" close=""> | |
677 | <mml:mrow> | |
678 | <mml:mn>8</mml:mn> | |
679 | <mml:mo></mml:mo> | |
680 | <mml:mi mathvariant="italic">a</mml:mi> | |
681 | </mml:mrow> | |
682 | </mml:mfenced> | |
683 | </mml:mfrac> | |
684 | </mml:mfenced> | |
685 | </mml:mrow> | |
686 | </mml:mrow> | |
687 | </mml:math> | |
688 | </p><p> | |
689 | components or indices. | |
690 | </p><p> | |
691 | The word <span class="emphasis"><em>component</em></span> in this description refers to the nonindex values | |
692 | red, | |
693 | green, | |
694 | blue, | |
695 | alpha, | |
696 | and depth. | |
697 | Storage format <code class="constant">GL_RGB</code>, | |
698 | for example, | |
699 | has three components per pixel: | |
700 | first red, | |
701 | then green, | |
702 | and finally blue. | |
703 | </p></dd><dt><span class="term"><code class="constant">GL_UNPACK_IMAGE_HEIGHT</code></span></dt><dd><p> | |
704 | If greater than 0, | |
705 | <code class="constant">GL_UNPACK_IMAGE_HEIGHT</code> defines the number of pixels in an image of | |
706 | a three-dimensional texture volume. Where ``image'' is defined by all | |
707 | pixel sharing the same third dimension index. | |
708 | If the first pixel of a row is placed at location | |
709 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">p</mml:mi></mml:math> | |
710 | in memory, | |
711 | then the location of the first pixel of the next row is obtained by skipping | |
712 | </p><p> | |
713 | </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
714 | ||
715 | <mml:mrow> | |
716 | <mml:mi mathvariant="italic">k</mml:mi> | |
717 | <mml:mo>=</mml:mo> | |
718 | <mml:mfenced open="{" close=""> | |
719 | <mml:mrow> | |
720 | <mml:mtable> | |
721 | <mml:mtr><mml:mtd> | |
722 | <mml:mrow> | |
723 | <mml:mi mathvariant="italic">n</mml:mi> | |
724 | <mml:mo></mml:mo> | |
725 | <mml:mi mathvariant="italic">l</mml:mi> | |
726 | <mml:mo></mml:mo> | |
727 | <mml:mi mathvariant="italic">h</mml:mi> | |
728 | </mml:mrow> | |
729 | </mml:mtd></mml:mtr> | |
730 | <mml:mtr><mml:mtd> | |
731 | <mml:mrow> | |
732 | <mml:mfenced open="" close=""> | |
733 | <mml:mfrac> | |
734 | <mml:mi mathvariant="italic">a</mml:mi> | |
735 | <mml:mi mathvariant="italic">s</mml:mi> | |
736 | </mml:mfrac> | |
737 | </mml:mfenced> | |
738 | <mml:mo></mml:mo> | |
739 | <mml:mfenced open="⌈" close="⌉"> | |
740 | <mml:mfrac> | |
741 | <mml:mfenced open="" close=""> | |
742 | <mml:mrow> | |
743 | <mml:mi mathvariant="italic">s</mml:mi> | |
744 | <mml:mo></mml:mo> | |
745 | <mml:mi mathvariant="italic">n</mml:mi> | |
746 | <mml:mo></mml:mo> | |
747 | <mml:mi mathvariant="italic">l</mml:mi> | |
748 | <mml:mo></mml:mo> | |
749 | <mml:mi mathvariant="italic">h</mml:mi> | |
750 | </mml:mrow> | |
751 | </mml:mfenced> | |
752 | <mml:mi mathvariant="italic">a</mml:mi> | |
753 | </mml:mfrac> | |
754 | </mml:mfenced> | |
755 | </mml:mrow> | |
756 | </mml:mtd></mml:mtr> | |
757 | </mml:mtable> | |
758 | <mml:mo></mml:mo> | |
759 | <mml:mtable> | |
760 | <mml:mtr><mml:mtd> | |
761 | <mml:mrow> | |
762 | <mml:mi mathvariant="italic">s</mml:mi> | |
763 | <mml:mo>>=</mml:mo> | |
764 | <mml:mi mathvariant="italic">a</mml:mi> | |
765 | </mml:mrow> | |
766 | </mml:mtd></mml:mtr> | |
767 | <mml:mtr><mml:mtd> | |
768 | <mml:mrow> | |
769 | <mml:mi mathvariant="italic">s</mml:mi> | |
770 | <mml:mo><</mml:mo> | |
771 | <mml:mi mathvariant="italic">a</mml:mi> | |
772 | </mml:mrow> | |
773 | </mml:mtd></mml:mtr> | |
774 | </mml:mtable> | |
775 | </mml:mrow> | |
776 | </mml:mfenced> | |
777 | </mml:mrow> | |
778 | </mml:math></div><p> | |
779 | </p><p> | |
780 | components or indices, | |
781 | where | |
782 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">n</mml:mi></mml:math> | |
783 | is the number of components or indices in a pixel, | |
784 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">l</mml:mi></mml:math> | |
785 | is the number of pixels in a row | |
786 | (<code class="constant">GL_UNPACK_ROW_LENGTH</code> if it is greater than 0, | |
787 | the | |
788 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">width</mml:mi></mml:math> | |
789 | argument to <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a> otherwise), | |
790 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">h</mml:mi></mml:math> | |
791 | is the number of rows in an image (<code class="constant">GL_UNPACK_IMAGE_HEIGHT</code> if | |
792 | it is greater than 0, the | |
793 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">height</mml:mi></mml:math> | |
794 | argument to <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a> otherwise), | |
795 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">a</mml:mi></mml:math> | |
796 | is the value of <code class="constant">GL_UNPACK_ALIGNMENT</code>, and | |
797 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math> | |
798 | is the size, in bytes, of a single component | |
799 | (if | |
800 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
801 | ||
802 | <mml:mrow> | |
803 | <mml:mi mathvariant="italic">a</mml:mi> | |
804 | <mml:mo><</mml:mo> | |
805 | <mml:mi mathvariant="italic">s</mml:mi> | |
806 | </mml:mrow> | |
807 | </mml:math>, | |
808 | then it is as if | |
809 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
810 | ||
811 | <mml:mrow> | |
812 | <mml:mi mathvariant="italic">a</mml:mi> | |
813 | <mml:mo>=</mml:mo> | |
814 | <mml:mi mathvariant="italic">s</mml:mi> | |
815 | </mml:mrow> | |
816 | </mml:math>). | |
817 | </p><p> | |
818 | The word <span class="emphasis"><em>component</em></span> in this description refers to the nonindex values | |
819 | red, | |
820 | green, | |
821 | blue, | |
822 | alpha, | |
823 | and depth. | |
824 | Storage format <code class="constant">GL_RGB</code>, | |
825 | for example, | |
826 | has three components per pixel: | |
827 | first red, | |
828 | then green, | |
829 | and finally blue. | |
830 | </p></dd><dt><span class="term"><code class="constant">GL_UNPACK_SKIP_PIXELS</code> and <code class="constant">GL_UNPACK_SKIP_ROWS</code></span></dt><dd><p> | |
831 | These values are provided as a convenience to the programmer; | |
832 | they provide no functionality that cannot be duplicated by | |
833 | incrementing the pointer passed to | |
834 | <a class="citerefentry" href="glDrawPixels.xml"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>, | |
835 | <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>, | |
836 | <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, | |
837 | <a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>, | |
838 | <a class="citerefentry" href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, | |
839 | <a class="citerefentry" href="glBitmap.xml"><span class="citerefentry"><span class="refentrytitle">glBitmap</span></span></a>, or | |
840 | <a class="citerefentry" href="glPolygonStipple.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonStipple</span></span></a>. | |
841 | Setting <code class="constant">GL_UNPACK_SKIP_PIXELS</code> to | |
842 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math> | |
843 | is equivalent to incrementing | |
844 | the pointer by | |
845 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
846 | ||
847 | <mml:mrow> | |
848 | <mml:mi mathvariant="italic">i</mml:mi> | |
849 | <mml:mo></mml:mo> | |
850 | <mml:mi mathvariant="italic">n</mml:mi> | |
851 | </mml:mrow> | |
852 | </mml:math> | |
853 | components or indices, | |
854 | where | |
855 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">n</mml:mi></mml:math> | |
856 | is the number of components or indices in each pixel. | |
857 | Setting <code class="constant">GL_UNPACK_SKIP_ROWS</code> to | |
858 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math> | |
859 | is equivalent to incrementing | |
860 | the pointer by | |
861 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
862 | ||
863 | <mml:mrow> | |
864 | <mml:mi mathvariant="italic">j</mml:mi> | |
865 | <mml:mo></mml:mo> | |
866 | <mml:mi mathvariant="italic">k</mml:mi> | |
867 | </mml:mrow> | |
868 | </mml:math> | |
869 | components or indices, | |
870 | where | |
871 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">k</mml:mi></mml:math> | |
872 | is the number of components or indices per row, | |
873 | as just computed in the <code class="constant">GL_UNPACK_ROW_LENGTH</code> section. | |
874 | </p></dd><dt><span class="term"><code class="constant">GL_UNPACK_ALIGNMENT</code></span></dt><dd><p> | |
875 | Specifies the alignment requirements for the start of each pixel row in memory. | |
876 | The allowable values are | |
877 | 1 (byte-alignment), | |
878 | 2 (rows aligned to even-numbered bytes), | |
879 | 4 (word-alignment), and | |
880 | 8 (rows start on double-word boundaries). | |
881 | </p></dd></dl></div><p> | |
882 | The following table gives the type, | |
883 | initial value, | |
884 | and range of valid values for each storage parameter | |
885 | that can be set with <code class="function">glPixelStore</code>. | |
886 | </p><p> | |
887 | </p><div class="informaltable"><table border="1"><colgroup><col align="left" /><col align="center" /><col align="center" /><col align="center" /></colgroup><thead><tr><th align="left"><span class="bold"><strong> | |
888 | <em class="parameter"><code>pname</code></em> | |
889 | </strong></span></th><th align="center"><span class="bold"><strong> | |
890 | Type | |
891 | </strong></span></th><th align="center"><span class="bold"><strong> | |
892 | Initial Value | |
893 | </strong></span></th><th align="center"><span class="bold"><strong> | |
894 | Valid Range | |
895 | </strong></span></th></tr></thead><tbody><tr><td align="left"> | |
896 | <code class="constant">GL_PACK_SWAP_BYTES</code> | |
897 | </td><td align="center"> | |
898 | boolean | |
899 | </td><td align="center"> | |
900 | false | |
901 | </td><td align="center"> | |
902 | true or false | |
903 | </td></tr><tr><td align="left"> | |
904 | <code class="constant">GL_PACK_LSB_FIRST</code> | |
905 | </td><td align="center"> | |
906 | boolean | |
907 | </td><td align="center"> | |
908 | false | |
909 | </td><td align="center"> | |
910 | true or false | |
911 | </td></tr><tr><td align="left"> | |
912 | <code class="constant">GL_PACK_ROW_LENGTH</code> | |
913 | </td><td align="center"> | |
914 | integer | |
915 | </td><td align="center"> | |
916 | 0 | |
917 | </td><td align="center"> | |
918 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
919 | ||
920 | <mml:mfenced open="[" close=")"> | |
921 | <mml:mn>0</mml:mn> | |
922 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
923 | </mml:mfenced> | |
924 | </mml:math> | |
925 | </td></tr><tr><td align="left"> | |
926 | <code class="constant">GL_PACK_IMAGE_HEIGHT</code> | |
927 | </td><td align="center"> | |
928 | integer | |
929 | </td><td align="center"> | |
930 | 0 | |
931 | </td><td align="center"> | |
932 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
933 | ||
934 | <mml:mfenced open="[" close=")"> | |
935 | <mml:mn>0</mml:mn> | |
936 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
937 | </mml:mfenced> | |
938 | </mml:math> | |
939 | </td></tr><tr><td align="left"> | |
940 | <code class="constant">GL_PACK_SKIP_ROWS</code> | |
941 | </td><td align="center"> | |
942 | integer | |
943 | </td><td align="center"> | |
944 | 0 | |
945 | </td><td align="center"> | |
946 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
947 | ||
948 | <mml:mfenced open="[" close=")"> | |
949 | <mml:mn>0</mml:mn> | |
950 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
951 | </mml:mfenced> | |
952 | </mml:math> | |
953 | </td></tr><tr><td align="left"> | |
954 | <code class="constant">GL_PACK_SKIP_PIXELS</code> | |
955 | </td><td align="center"> | |
956 | integer | |
957 | </td><td align="center"> | |
958 | 0 | |
959 | </td><td align="center"> | |
960 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
961 | ||
962 | <mml:mfenced open="[" close=")"> | |
963 | <mml:mn>0</mml:mn> | |
964 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
965 | </mml:mfenced> | |
966 | </mml:math> | |
967 | </td></tr><tr><td align="left"> | |
968 | <code class="constant">GL_PACK_SKIP_IMAGES</code> | |
969 | </td><td align="center"> | |
970 | integer | |
971 | </td><td align="center"> | |
972 | 0 | |
973 | </td><td align="center"> | |
974 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
975 | ||
976 | <mml:mfenced open="[" close=")"> | |
977 | <mml:mn>0</mml:mn> | |
978 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
979 | </mml:mfenced> | |
980 | </mml:math> | |
981 | </td></tr><tr><td align="left"> | |
982 | <code class="constant">GL_PACK_ALIGNMENT</code> | |
983 | </td><td align="center"> | |
984 | integer | |
985 | </td><td align="center"> | |
986 | 4 | |
987 | </td><td align="center"> | |
988 | 1, 2, 4, or 8 | |
989 | </td></tr><tr><td align="left"> | |
990 | <code class="constant">GL_UNPACK_SWAP_BYTES</code> | |
991 | </td><td align="center"> | |
992 | boolean | |
993 | </td><td align="center"> | |
994 | false | |
995 | </td><td align="center"> | |
996 | true or false | |
997 | </td></tr><tr><td align="left"> | |
998 | <code class="constant">GL_UNPACK_LSB_FIRST</code> | |
999 | </td><td align="center"> | |
1000 | boolean | |
1001 | </td><td align="center"> | |
1002 | false | |
1003 | </td><td align="center"> | |
1004 | true or false | |
1005 | </td></tr><tr><td align="left"> | |
1006 | <code class="constant">GL_UNPACK_ROW_LENGTH</code> | |
1007 | </td><td align="center"> | |
1008 | integer | |
1009 | </td><td align="center"> | |
1010 | 0 | |
1011 | </td><td align="center"> | |
1012 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
1013 | ||
1014 | <mml:mfenced open="[" close=")"> | |
1015 | <mml:mn>0</mml:mn> | |
1016 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
1017 | </mml:mfenced> | |
1018 | </mml:math> | |
1019 | </td></tr><tr><td align="left"> | |
1020 | <code class="constant">GL_UNPACK_IMAGE_HEIGHT</code> | |
1021 | </td><td align="center"> | |
1022 | integer | |
1023 | </td><td align="center"> | |
1024 | 0 | |
1025 | </td><td align="center"> | |
1026 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
1027 | ||
1028 | <mml:mfenced open="[" close=")"> | |
1029 | <mml:mn>0</mml:mn> | |
1030 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
1031 | </mml:mfenced> | |
1032 | </mml:math> | |
1033 | </td></tr><tr><td align="left"> | |
1034 | <code class="constant">GL_UNPACK_SKIP_ROWS</code> | |
1035 | </td><td align="center"> | |
1036 | integer | |
1037 | </td><td align="center"> | |
1038 | 0 | |
1039 | </td><td align="center"> | |
1040 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
1041 | ||
1042 | <mml:mfenced open="[" close=")"> | |
1043 | <mml:mn>0</mml:mn> | |
1044 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
1045 | </mml:mfenced> | |
1046 | </mml:math> | |
1047 | </td></tr><tr><td align="left"> | |
1048 | <code class="constant">GL_UNPACK_SKIP_PIXELS</code> | |
1049 | </td><td align="center"> | |
1050 | integer | |
1051 | </td><td align="center"> | |
1052 | 0 | |
1053 | </td><td align="center"> | |
1054 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
1055 | ||
1056 | <mml:mfenced open="[" close=")"> | |
1057 | <mml:mn>0</mml:mn> | |
1058 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
1059 | </mml:mfenced> | |
1060 | </mml:math> | |
1061 | </td></tr><tr><td align="left"> | |
1062 | <code class="constant">GL_UNPACK_SKIP_IMAGES</code> | |
1063 | </td><td align="center"> | |
1064 | integer | |
1065 | </td><td align="center"> | |
1066 | 0 | |
1067 | </td><td align="center"> | |
1068 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
1069 | ||
1070 | <mml:mfenced open="[" close=")"> | |
1071 | <mml:mn>0</mml:mn> | |
1072 | <mml:infinity definitionURL="" encoding=""></mml:infinity> | |
1073 | </mml:mfenced> | |
1074 | </mml:math> | |
1075 | </td></tr><tr><td align="left"> | |
1076 | <code class="constant">GL_UNPACK_ALIGNMENT</code> | |
1077 | </td><td align="center"> | |
1078 | integer | |
1079 | </td><td align="center"> | |
1080 | 4 | |
1081 | </td><td align="center"> | |
1082 | 1, 2, 4, or 8 | |
1083 | </td></tr></tbody></table></div><p> | |
1084 | <code class="function">glPixelStoref</code> can be used to set any pixel store parameter. | |
1085 | If the parameter type is boolean, | |
1086 | then if <em class="parameter"><code>param</code></em> is 0, | |
1087 | the parameter is false; | |
1088 | otherwise it is set to true. | |
1089 | If <em class="parameter"><code>pname</code></em> is a integer type parameter, | |
1090 | <em class="parameter"><code>param</code></em> is rounded to the nearest integer. | |
1091 | </p><p> | |
1092 | Likewise, <code class="function">glPixelStorei</code> can also be used to set any of the | |
1093 | pixel store parameters. | |
1094 | Boolean parameters are set to false if <em class="parameter"><code>param</code></em> is 0 and true otherwise. | |
1095 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
1096 | The pixel storage modes in effect when | |
1097 | <a class="citerefentry" href="glDrawPixels.xml"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>, | |
1098 | <a class="citerefentry" href="glReadPixels.xml"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>, | |
1099 | <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>, | |
1100 | <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, | |
1101 | <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>, | |
1102 | <a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>, | |
1103 | <a class="citerefentry" href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, | |
1104 | <a class="citerefentry" href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>, | |
1105 | <a class="citerefentry" href="glBitmap.xml"><span class="citerefentry"><span class="refentrytitle">glBitmap</span></span></a>, | |
1106 | or <a class="citerefentry" href="glPolygonStipple.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonStipple</span></span></a> is placed in a display list control the interpretation | |
1107 | of memory data. | |
1108 | Likewise, if the <code class="code">ARB_imaging</code> extension is supported, the pixel | |
1109 | storage modes in effect when | |
1110 | <a class="citerefentry" href="glColorTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>, | |
1111 | <a class="citerefentry" href="glColorSubTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorSubTable</span></span></a>, | |
1112 | <a class="citerefentry" href="glConvolutionFilter1D.xml"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter1D</span></span></a>, | |
1113 | <a class="citerefentry" href="glConvolutionFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter2D</span></span></a>, of | |
1114 | <a class="citerefentry" href="glSeparableFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glSeparableFilter2D</span></span></a> is placed in a display list control the | |
1115 | interpretation of memory data. | |
1116 | The pixel storage modes in effect when a display list is executed are | |
1117 | not significant. | |
1118 | </p><p> | |
1119 | Pixel storage modes are client state and must be pushed and restored | |
1120 | using | |
1121 | <a class="citerefentry" href="glPushClientAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPushClientAttrib</span></span></a> and <a class="citerefentry" href="glPopClientAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPopClientAttrib</span></span></a>. | |
1122 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
1123 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>pname</code></em> is not an accepted value. | |
1124 | </p><p> | |
1125 | <code class="constant">GL_INVALID_VALUE</code> is generated if a negative row length, | |
1126 | pixel skip, | |
1127 | or row skip value is specified, | |
1128 | or if alignment is specified as other than 1, 2, 4, or 8. | |
1129 | </p><p> | |
1130 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glPixelStore</code> | |
1131 | is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> | |
1132 | and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
1133 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
1134 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PACK_SWAP_BYTES</code> | |
1135 | </p><p> | |
1136 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PACK_LSB_FIRST</code> | |
1137 | </p><p> | |
1138 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PACK_ROW_LENGTH</code> | |
1139 | </p><p> | |
1140 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PACK_IMAGE_HEIGHT</code> | |
1141 | </p><p> | |
1142 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PACK_SKIP_ROWS</code> | |
1143 | </p><p> | |
1144 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PACK_SKIP_PIXELS</code> | |
1145 | </p><p> | |
1146 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PACK_SKIP_IMAGES</code> | |
1147 | </p><p> | |
1148 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PACK_ALIGNMENT</code> | |
1149 | </p><p> | |
1150 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNPACK_SWAP_BYTES</code> | |
1151 | </p><p> | |
1152 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNPACK_LSB_FIRST</code> | |
1153 | </p><p> | |
1154 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNPACK_ROW_LENGTH</code> | |
1155 | </p><p> | |
1156 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNPACK_IMAGE_HEIGHT</code> | |
1157 | </p><p> | |
1158 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNPACK_SKIP_ROWS</code> | |
1159 | </p><p> | |
1160 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNPACK_SKIP_PIXELS</code> | |
1161 | </p><p> | |
1162 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNPACK_SKIP_IMAGES</code> | |
1163 | </p><p> | |
1164 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNPACK_ALIGNMENT</code> | |
1165 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
1166 | <a class="citerefentry" href="glBitmap.xml"><span class="citerefentry"><span class="refentrytitle">glBitmap</span></span></a>, | |
1167 | <a class="citerefentry" href="glColorTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>, | |
1168 | <a class="citerefentry" href="glColorSubTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorSubTable</span></span></a>, | |
1169 | <a class="citerefentry" href="glConvolutionFilter1D.xml"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter1D</span></span></a>, | |
1170 | <a class="citerefentry" href="glConvolutionFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter2D</span></span></a>, | |
1171 | <a class="citerefentry" href="glSeparableFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glSeparableFilter2D</span></span></a>, | |
1172 | <a class="citerefentry" href="glDrawPixels.xml"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>, | |
1173 | <a class="citerefentry" href="glHistogram.xml"><span class="citerefentry"><span class="refentrytitle">glHistogram</span></span></a>, | |
1174 | <a class="citerefentry" href="glMinmax.xml"><span class="citerefentry"><span class="refentrytitle">glMinmax</span></span></a>, | |
1175 | <a class="citerefentry" href="glPixelMap.xml"><span class="citerefentry"><span class="refentrytitle">glPixelMap</span></span></a>, | |
1176 | <a class="citerefentry" href="glPixelTransfer.xml"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>, | |
1177 | <a class="citerefentry" href="glPixelZoom.xml"><span class="citerefentry"><span class="refentrytitle">glPixelZoom</span></span></a>, | |
1178 | <a class="citerefentry" href="glPolygonStipple.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonStipple</span></span></a>, | |
1179 | <a class="citerefentry" href="glPushClientAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPushClientAttrib</span></span></a>, | |
1180 | <a class="citerefentry" href="glReadPixels.xml"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>, | |
1181 | <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>, | |
1182 | <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, | |
1183 | <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>, | |
1184 | <a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>, | |
1185 | <a class="citerefentry" href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, | |
1186 | <a class="citerefentry" href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a> | |
1187 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
1188 | Copyright <span class="trademark"></span>© 1991-2006 | |
1189 | Silicon Graphics, Inc. This document is licensed under the SGI | |
1190 | Free Software B License. For details, see | |
1191 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
1192 | </p></div></div></body></html> |