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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> | |
3 | <!-- saved from url=(0013)about:internet --> | |
4 | <?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" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glReadPixels - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glReadPixels"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glReadPixels — read a block of pixels from 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">glReadPixels</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">format</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">type</var>, </td></tr><tr><td> </td><td>GLvoid * </td><td><var class="pdparam">data</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> | |
5 | Specify the window coordinates of the first pixel | |
6 | that is read from the frame buffer. | |
7 | This location is the lower left corner of a rectangular block of pixels. | |
8 | </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> | |
9 | Specify the dimensions of the pixel rectangle. | |
10 | <em class="parameter"><code>width</code></em> and <em class="parameter"><code>height</code></em> of one correspond to a single pixel. | |
11 | </p></dd><dt><span class="term"><em class="parameter"><code>format</code></em></span></dt><dd><p> | |
12 | Specifies the format of the pixel data. | |
13 | The following symbolic values are accepted: | |
14 | <code class="constant">GL_STENCIL_INDEX</code>, | |
15 | <code class="constant">GL_DEPTH_COMPONENT</code>, | |
16 | <code class="constant">GL_DEPTH_STENCIL</code>, | |
17 | <code class="constant">GL_RED</code>, | |
18 | <code class="constant">GL_GREEN</code>, | |
19 | <code class="constant">GL_BLUE</code>, | |
20 | <code class="constant">GL_RGB</code>, | |
21 | <code class="constant">GL_BGR</code>, | |
22 | <code class="constant">GL_RGBA</code>, and | |
23 | <code class="constant">GL_BGRA</code>. | |
24 | </p></dd><dt><span class="term"><em class="parameter"><code>type</code></em></span></dt><dd><p> | |
25 | Specifies the data type of the pixel data. | |
26 | Must be one of | |
27 | <code class="constant">GL_UNSIGNED_BYTE</code>, | |
28 | <code class="constant">GL_BYTE</code>, | |
29 | <code class="constant">GL_UNSIGNED_SHORT</code>, | |
30 | <code class="constant">GL_SHORT</code>, | |
31 | <code class="constant">GL_UNSIGNED_INT</code>, | |
32 | <code class="constant">GL_INT</code>, | |
33 | <code class="constant">GL_HALF_FLOAT</code>, | |
34 | <code class="constant">GL_FLOAT</code>, | |
35 | <code class="constant">GL_UNSIGNED_BYTE_3_3_2</code>, | |
36 | <code class="constant">GL_UNSIGNED_BYTE_2_3_3_REV</code>, | |
37 | <code class="constant">GL_UNSIGNED_SHORT_5_6_5</code>, | |
38 | <code class="constant">GL_UNSIGNED_SHORT_5_6_5_REV</code>, | |
39 | <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4</code>, | |
40 | <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4_REV</code>, | |
41 | <code class="constant">GL_UNSIGNED_SHORT_5_5_5_1</code>, | |
42 | <code class="constant">GL_UNSIGNED_SHORT_1_5_5_5_REV</code>, | |
43 | <code class="constant">GL_UNSIGNED_INT_8_8_8_8</code>, | |
44 | <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code>, | |
45 | <code class="constant">GL_UNSIGNED_INT_10_10_10_2</code>, | |
46 | <code class="constant">GL_UNSIGNED_INT_2_10_10_10_REV</code>, | |
47 | <code class="constant">GL_UNSIGNED_INT_24_8</code>, | |
48 | <code class="constant">GL_UNSIGNED_INT_10F_11F_11F_REV</code>, | |
49 | <code class="constant">GL_UNSIGNED_INT_5_9_9_9_REV</code>, or | |
50 | <code class="constant">GL_FLOAT_32_UNSIGNED_INT_24_8_REV</code>. | |
51 | </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p> | |
52 | Returns the pixel data. | |
53 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
54 | <code class="function">glReadPixels</code> returns pixel data from the frame buffer, | |
55 | starting with the pixel whose lower left corner | |
56 | is at location (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>), | |
57 | into client memory starting at location <em class="parameter"><code>data</code></em>. | |
58 | Several parameters control the processing of the pixel data before | |
59 | it is placed into client memory. | |
60 | These parameters are set with <a href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>. | |
61 | This reference page describes the effects on <code class="function">glReadPixels</code> of most, | |
62 | but not all of the parameters specified by these three commands. | |
63 | </p><p> | |
64 | If a non-zero named buffer object is bound to the <code class="constant">GL_PIXEL_PACK_BUFFER</code> target | |
65 | (see <a href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>) while a block of pixels is | |
66 | requested, <em class="parameter"><code>data</code></em> is treated as a byte offset into the buffer object's data store | |
67 | rather than a pointer to client memory. | |
68 | </p><p> | |
69 | <code class="function">glReadPixels</code> returns values from each pixel with lower left corner at | |
70 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
71 | ||
72 | <mml:mfenced open="(" close=")"> | |
73 | <mml:mrow> | |
74 | <mml:mi mathvariant="italic">x</mml:mi> | |
75 | <mml:mo>+</mml:mo> | |
76 | <mml:mi mathvariant="italic">i</mml:mi> | |
77 | </mml:mrow> | |
78 | <mml:mrow> | |
79 | <mml:mi mathvariant="italic">y</mml:mi> | |
80 | <mml:mo>+</mml:mo> | |
81 | <mml:mi mathvariant="italic">j</mml:mi> | |
82 | </mml:mrow> | |
83 | </mml:mfenced> | |
84 | </mml:math> | |
85 | for | |
86 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
87 | ||
88 | <mml:mrow> | |
89 | <mml:mn>0</mml:mn> | |
90 | <mml:mo><=</mml:mo> | |
91 | <mml:mi mathvariant="italic">i</mml:mi> | |
92 | <mml:mo><</mml:mo> | |
93 | <mml:mi mathvariant="italic">width</mml:mi> | |
94 | </mml:mrow> | |
95 | </mml:math> | |
96 | and | |
97 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
98 | ||
99 | <mml:mrow> | |
100 | <mml:mn>0</mml:mn> | |
101 | <mml:mo><=</mml:mo> | |
102 | <mml:mi mathvariant="italic">j</mml:mi> | |
103 | <mml:mo><</mml:mo> | |
104 | <mml:mi mathvariant="italic">height</mml:mi> | |
105 | </mml:mrow> | |
106 | </mml:math>. | |
107 | This pixel is said to be the | |
108 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math>th | |
109 | pixel in the | |
110 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math>th | |
111 | row. | |
112 | Pixels are returned in row order from the lowest to the highest row, | |
113 | left to right in each row. | |
114 | </p><p> | |
115 | <em class="parameter"><code>format</code></em> specifies the format for the returned pixel values; | |
116 | accepted values are: | |
117 | </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GL_STENCIL_INDEX</code></span></dt><dd><p> | |
118 | Stencil values are read from the stencil buffer. | |
119 | Each index is converted to fixed point, | |
120 | shifted left or right depending on the value and sign of <code class="constant">GL_INDEX_SHIFT</code>, | |
121 | and added to <code class="constant">GL_INDEX_OFFSET</code>. | |
122 | If <code class="constant">GL_MAP_STENCIL</code> is <code class="constant">GL_TRUE</code>, | |
123 | indices are replaced by their mappings in the table <code class="constant">GL_PIXEL_MAP_S_TO_S</code>. | |
124 | </p></dd><dt><span class="term"><code class="constant">GL_DEPTH_COMPONENT</code></span></dt><dd><p> | |
125 | Depth values are read from the depth buffer. | |
126 | Each component is converted to floating point such that the minimum depth | |
127 | value maps to 0 and the maximum value maps to 1. | |
128 | Each component is then multiplied by <code class="constant">GL_DEPTH_SCALE</code>, | |
129 | added to <code class="constant">GL_DEPTH_BIAS</code>, | |
130 | and finally clamped to the range | |
131 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
132 | ||
133 | <mml:mfenced open="[" close="]"> | |
134 | <mml:mn>0</mml:mn> | |
135 | <mml:mn>1</mml:mn> | |
136 | </mml:mfenced> | |
137 | </mml:math>. | |
138 | </p></dd><dt><span class="term"><code class="constant">GL_DEPTH_STENCIL</code></span></dt><dd><p> | |
139 | Values are taken from both the depth and stencil buffers. The <em class="parameter"><code>type</code></em> parameter | |
140 | must be <code class="constant">GL_UNSIGNED_INT_24_8</code> or <code class="constant">GL_FLOAT_32_UNSIGNED_INT_24_8_REV</code>. | |
141 | </p></dd><dt><span class="term"><code class="constant">GL_RED</code></span></dt><dd></dd><dt><span class="term"><code class="constant">GL_GREEN</code></span></dt><dd></dd><dt><span class="term"><code class="constant">GL_BLUE</code></span></dt><dd></dd><dt><span class="term"><code class="constant">GL_RGB</code></span></dt><dd></dd><dt><span class="term"><code class="constant">GL_BGR</code></span></dt><dd></dd><dt><span class="term"><code class="constant">GL_RGBA</code></span></dt><dd></dd><dt><span class="term"><code class="constant">GL_BGRA</code></span></dt><dd></dd></dl></div><p> | |
142 | Finally, the indices or components | |
143 | are converted to the proper format, | |
144 | as specified by <em class="parameter"><code>type</code></em>. | |
145 | If <em class="parameter"><code>format</code></em> is <code class="constant">GL_STENCIL_INDEX</code> | |
146 | and <em class="parameter"><code>type</code></em> is not <code class="constant">GL_FLOAT</code>, | |
147 | each index is masked with the mask value given in the following table. | |
148 | If <em class="parameter"><code>type</code></em> is <code class="constant">GL_FLOAT</code>, then each integer index is converted to | |
149 | single-precision floating-point format. | |
150 | </p><p> | |
151 | If <em class="parameter"><code>format</code></em> is | |
152 | <code class="constant">GL_RED</code>, | |
153 | <code class="constant">GL_GREEN</code>, | |
154 | <code class="constant">GL_BLUE</code>, | |
155 | <code class="constant">GL_RGB</code>, | |
156 | <code class="constant">GL_BGR</code>, | |
157 | <code class="constant">GL_RGBA</code>, or | |
158 | <code class="constant">GL_BGRA</code> and <em class="parameter"><code>type</code></em> is not <code class="constant">GL_FLOAT</code>, | |
159 | each component is multiplied by the multiplier shown in the following table. | |
160 | If type is <code class="constant">GL_FLOAT</code>, then each component is passed as is | |
161 | (or converted to the client's single-precision floating-point format if | |
162 | it is different from the one used by the GL). | |
163 | </p><p> | |
164 | </p><div class="informaltable"><table border="1"><colgroup><col align="left" /><col align="center" /><col align="center" /></colgroup><thead><tr><th align="left"> | |
165 | <em class="parameter"><code>type</code></em> | |
166 | </th><th align="center"><span class="bold"><strong> | |
167 | Index Mask | |
168 | </strong></span></th><th align="center"><span class="bold"><strong> | |
169 | Component Conversion | |
170 | </strong></span></th></tr></thead><tbody><tr><td align="left"> | |
171 | <code class="constant">GL_UNSIGNED_BYTE</code> | |
172 | </td><td align="center"> | |
173 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
174 | ||
175 | <mml:mrow> | |
176 | <mml:msup><mml:mn>2</mml:mn> | |
177 | <mml:mn>8</mml:mn> | |
178 | </mml:msup> | |
179 | <mml:mo>-</mml:mo> | |
180 | <mml:mn>1</mml:mn> | |
181 | </mml:mrow> | |
182 | </mml:math> | |
183 | </td><td align="center"> | |
184 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
185 | ||
186 | <mml:mrow> | |
187 | <mml:mfenced open="(" close=")"> | |
188 | <mml:mrow> | |
189 | <mml:msup><mml:mn>2</mml:mn> | |
190 | <mml:mn>8</mml:mn> | |
191 | </mml:msup> | |
192 | <mml:mo>-</mml:mo> | |
193 | <mml:mn>1</mml:mn> | |
194 | </mml:mrow> | |
195 | </mml:mfenced> | |
196 | <mml:mo></mml:mo> | |
197 | <mml:mi mathvariant="italic">c</mml:mi> | |
198 | </mml:mrow> | |
199 | </mml:math> | |
200 | </td></tr><tr><td align="left"> | |
201 | <code class="constant">GL_BYTE</code> | |
202 | </td><td align="center"> | |
203 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
204 | ||
205 | <mml:mrow> | |
206 | <mml:msup><mml:mn>2</mml:mn> | |
207 | <mml:mn>7</mml:mn> | |
208 | </mml:msup> | |
209 | <mml:mo>-</mml:mo> | |
210 | <mml:mn>1</mml:mn> | |
211 | </mml:mrow> | |
212 | </mml:math> | |
213 | </td><td align="center"> | |
214 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
215 | ||
216 | <mml:mfrac> | |
217 | <mml:mfenced open="" close=""> | |
218 | <mml:mrow> | |
219 | <mml:mfenced open="(" close=")"> | |
220 | <mml:mrow> | |
221 | <mml:msup><mml:mn>2</mml:mn> | |
222 | <mml:mn>8</mml:mn> | |
223 | </mml:msup> | |
224 | <mml:mo>-</mml:mo> | |
225 | <mml:mn>1</mml:mn> | |
226 | </mml:mrow> | |
227 | </mml:mfenced> | |
228 | <mml:mo></mml:mo> | |
229 | <mml:mi mathvariant="italic">c</mml:mi> | |
230 | <mml:mo>-</mml:mo> | |
231 | <mml:mn>1</mml:mn> | |
232 | </mml:mrow> | |
233 | </mml:mfenced> | |
234 | <mml:mn>2</mml:mn> | |
235 | </mml:mfrac> | |
236 | </mml:math> | |
237 | </td></tr><tr><td align="left"> | |
238 | <code class="constant">GL_UNSIGNED_SHORT</code> | |
239 | </td><td align="center"> | |
240 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
241 | ||
242 | <mml:mrow> | |
243 | <mml:msup><mml:mn>2</mml:mn> | |
244 | <mml:mn>16</mml:mn> | |
245 | </mml:msup> | |
246 | <mml:mo>-</mml:mo> | |
247 | <mml:mn>1</mml:mn> | |
248 | </mml:mrow> | |
249 | </mml:math> | |
250 | </td><td align="center"> | |
251 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
252 | ||
253 | <mml:mrow> | |
254 | <mml:mfenced open="(" close=")"> | |
255 | <mml:mrow> | |
256 | <mml:msup><mml:mn>2</mml:mn> | |
257 | <mml:mn>16</mml:mn> | |
258 | </mml:msup> | |
259 | <mml:mo>-</mml:mo> | |
260 | <mml:mn>1</mml:mn> | |
261 | </mml:mrow> | |
262 | </mml:mfenced> | |
263 | <mml:mo></mml:mo> | |
264 | <mml:mi mathvariant="italic">c</mml:mi> | |
265 | </mml:mrow> | |
266 | </mml:math> | |
267 | </td></tr><tr><td align="left"> | |
268 | <code class="constant">GL_SHORT</code> | |
269 | </td><td align="center"> | |
270 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
271 | ||
272 | <mml:mrow> | |
273 | <mml:msup><mml:mn>2</mml:mn> | |
274 | <mml:mn>15</mml:mn> | |
275 | </mml:msup> | |
276 | <mml:mo>-</mml:mo> | |
277 | <mml:mn>1</mml:mn> | |
278 | </mml:mrow> | |
279 | </mml:math> | |
280 | </td><td align="center"> | |
281 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
282 | ||
283 | <mml:mfrac> | |
284 | <mml:mfenced open="" close=""> | |
285 | <mml:mrow> | |
286 | <mml:mfenced open="(" close=")"> | |
287 | <mml:mrow> | |
288 | <mml:msup><mml:mn>2</mml:mn> | |
289 | <mml:mn>16</mml:mn> | |
290 | </mml:msup> | |
291 | <mml:mo>-</mml:mo> | |
292 | <mml:mn>1</mml:mn> | |
293 | </mml:mrow> | |
294 | </mml:mfenced> | |
295 | <mml:mo></mml:mo> | |
296 | <mml:mi mathvariant="italic">c</mml:mi> | |
297 | <mml:mo>-</mml:mo> | |
298 | <mml:mn>1</mml:mn> | |
299 | </mml:mrow> | |
300 | </mml:mfenced> | |
301 | <mml:mn>2</mml:mn> | |
302 | </mml:mfrac> | |
303 | </mml:math> | |
304 | </td></tr><tr><td align="left"> | |
305 | <code class="constant">GL_UNSIGNED_INT</code> | |
306 | </td><td align="center"> | |
307 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
308 | ||
309 | <mml:mrow> | |
310 | <mml:msup><mml:mn>2</mml:mn> | |
311 | <mml:mn>32</mml:mn> | |
312 | </mml:msup> | |
313 | <mml:mo>-</mml:mo> | |
314 | <mml:mn>1</mml:mn> | |
315 | </mml:mrow> | |
316 | </mml:math> | |
317 | </td><td align="center"> | |
318 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
319 | ||
320 | <mml:mrow> | |
321 | <mml:mfenced open="(" close=")"> | |
322 | <mml:mrow> | |
323 | <mml:msup><mml:mn>2</mml:mn> | |
324 | <mml:mn>32</mml:mn> | |
325 | </mml:msup> | |
326 | <mml:mo>-</mml:mo> | |
327 | <mml:mn>1</mml:mn> | |
328 | </mml:mrow> | |
329 | </mml:mfenced> | |
330 | <mml:mo></mml:mo> | |
331 | <mml:mi mathvariant="italic">c</mml:mi> | |
332 | </mml:mrow> | |
333 | </mml:math> | |
334 | </td></tr><tr><td align="left"> | |
335 | <code class="constant">GL_INT</code> | |
336 | </td><td align="center"> | |
337 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
338 | ||
339 | <mml:mrow> | |
340 | <mml:msup><mml:mn>2</mml:mn> | |
341 | <mml:mn>31</mml:mn> | |
342 | </mml:msup> | |
343 | <mml:mo>-</mml:mo> | |
344 | <mml:mn>1</mml:mn> | |
345 | </mml:mrow> | |
346 | </mml:math> | |
347 | </td><td align="center"> | |
348 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
349 | ||
350 | <mml:mfrac> | |
351 | <mml:mfenced open="" close=""> | |
352 | <mml:mrow> | |
353 | <mml:mfenced open="(" close=")"> | |
354 | <mml:mrow> | |
355 | <mml:msup><mml:mn>2</mml:mn> | |
356 | <mml:mn>32</mml:mn> | |
357 | </mml:msup> | |
358 | <mml:mo>-</mml:mo> | |
359 | <mml:mn>1</mml:mn> | |
360 | </mml:mrow> | |
361 | </mml:mfenced> | |
362 | <mml:mo></mml:mo> | |
363 | <mml:mi mathvariant="italic">c</mml:mi> | |
364 | <mml:mo>-</mml:mo> | |
365 | <mml:mn>1</mml:mn> | |
366 | </mml:mrow> | |
367 | </mml:mfenced> | |
368 | <mml:mn>2</mml:mn> | |
369 | </mml:mfrac> | |
370 | </mml:math> | |
371 | </td></tr><tr><td align="left"> | |
372 | <code class="constant">GL_HALF_FLOAT</code> | |
373 | </td><td align="center"> | |
374 | none | |
375 | </td><td align="center"> | |
376 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">c</mml:mi></mml:math> | |
377 | </td></tr><tr><td align="left"> | |
378 | <code class="constant">GL_FLOAT</code> | |
379 | </td><td align="center"> | |
380 | none | |
381 | </td><td align="center"> | |
382 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">c</mml:mi></mml:math> | |
383 | </td></tr><tr><td align="left"> | |
384 | <code class="constant">GL_UNSIGNED_BYTE_3_3_2</code> | |
385 | </td><td align="center"> | |
386 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
387 | ||
388 | <mml:mrow> | |
389 | <mml:msup><mml:mn>2</mml:mn> | |
390 | <mml:mn>N</mml:mn> | |
391 | </mml:msup> | |
392 | <mml:mo>-</mml:mo> | |
393 | <mml:mn>1</mml:mn> | |
394 | </mml:mrow> | |
395 | </mml:math> | |
396 | </td><td align="center"> | |
397 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
398 | ||
399 | <mml:mrow> | |
400 | <mml:mfenced open="(" close=")"> | |
401 | <mml:mrow> | |
402 | <mml:msup><mml:mn>2</mml:mn> | |
403 | <mml:mn>N</mml:mn> | |
404 | </mml:msup> | |
405 | <mml:mo>-</mml:mo> | |
406 | <mml:mn>1</mml:mn> | |
407 | </mml:mrow> | |
408 | </mml:mfenced> | |
409 | <mml:mo></mml:mo> | |
410 | <mml:mi mathvariant="italic">c</mml:mi> | |
411 | </mml:mrow> | |
412 | </mml:math> | |
413 | </td></tr><tr><td align="left"> | |
414 | <code class="constant">GL_UNSIGNED_BYTE_2_3_3_REV</code> | |
415 | </td><td align="center"> | |
416 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
417 | ||
418 | <mml:mrow> | |
419 | <mml:msup><mml:mn>2</mml:mn> | |
420 | <mml:mn>N</mml:mn> | |
421 | </mml:msup> | |
422 | <mml:mo>-</mml:mo> | |
423 | <mml:mn>1</mml:mn> | |
424 | </mml:mrow> | |
425 | </mml:math> | |
426 | </td><td align="center"> | |
427 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
428 | ||
429 | <mml:mrow> | |
430 | <mml:mfenced open="(" close=")"> | |
431 | <mml:mrow> | |
432 | <mml:msup><mml:mn>2</mml:mn> | |
433 | <mml:mn>N</mml:mn> | |
434 | </mml:msup> | |
435 | <mml:mo>-</mml:mo> | |
436 | <mml:mn>1</mml:mn> | |
437 | </mml:mrow> | |
438 | </mml:mfenced> | |
439 | <mml:mo></mml:mo> | |
440 | <mml:mi mathvariant="italic">c</mml:mi> | |
441 | </mml:mrow> | |
442 | </mml:math> | |
443 | </td></tr><tr><td align="left"> | |
444 | <code class="constant">GL_UNSIGNED_SHORT_5_6_5</code> | |
445 | </td><td align="center"> | |
446 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
447 | ||
448 | <mml:mrow> | |
449 | <mml:msup><mml:mn>2</mml:mn> | |
450 | <mml:mn>N</mml:mn> | |
451 | </mml:msup> | |
452 | <mml:mo>-</mml:mo> | |
453 | <mml:mn>1</mml:mn> | |
454 | </mml:mrow> | |
455 | </mml:math> | |
456 | </td><td align="center"> | |
457 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
458 | ||
459 | <mml:mrow> | |
460 | <mml:mfenced open="(" close=")"> | |
461 | <mml:mrow> | |
462 | <mml:msup><mml:mn>2</mml:mn> | |
463 | <mml:mn>N</mml:mn> | |
464 | </mml:msup> | |
465 | <mml:mo>-</mml:mo> | |
466 | <mml:mn>1</mml:mn> | |
467 | </mml:mrow> | |
468 | </mml:mfenced> | |
469 | <mml:mo></mml:mo> | |
470 | <mml:mi mathvariant="italic">c</mml:mi> | |
471 | </mml:mrow> | |
472 | </mml:math> | |
473 | </td></tr><tr><td align="left"> | |
474 | <code class="constant">GL_UNSIGNED_SHORT_5_6_5_REV</code> | |
475 | </td><td align="center"> | |
476 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
477 | ||
478 | <mml:mrow> | |
479 | <mml:msup><mml:mn>2</mml:mn> | |
480 | <mml:mn>N</mml:mn> | |
481 | </mml:msup> | |
482 | <mml:mo>-</mml:mo> | |
483 | <mml:mn>1</mml:mn> | |
484 | </mml:mrow> | |
485 | </mml:math> | |
486 | </td><td align="center"> | |
487 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
488 | ||
489 | <mml:mrow> | |
490 | <mml:mfenced open="(" close=")"> | |
491 | <mml:mrow> | |
492 | <mml:msup><mml:mn>2</mml:mn> | |
493 | <mml:mn>N</mml:mn> | |
494 | </mml:msup> | |
495 | <mml:mo>-</mml:mo> | |
496 | <mml:mn>1</mml:mn> | |
497 | </mml:mrow> | |
498 | </mml:mfenced> | |
499 | <mml:mo></mml:mo> | |
500 | <mml:mi mathvariant="italic">c</mml:mi> | |
501 | </mml:mrow> | |
502 | </mml:math> | |
503 | </td></tr><tr><td align="left"> | |
504 | <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4</code> | |
505 | </td><td align="center"> | |
506 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
507 | ||
508 | <mml:mrow> | |
509 | <mml:msup><mml:mn>2</mml:mn> | |
510 | <mml:mn>N</mml:mn> | |
511 | </mml:msup> | |
512 | <mml:mo>-</mml:mo> | |
513 | <mml:mn>1</mml:mn> | |
514 | </mml:mrow> | |
515 | </mml:math> | |
516 | </td><td align="center"> | |
517 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
518 | ||
519 | <mml:mrow> | |
520 | <mml:mfenced open="(" close=")"> | |
521 | <mml:mrow> | |
522 | <mml:msup><mml:mn>2</mml:mn> | |
523 | <mml:mn>N</mml:mn> | |
524 | </mml:msup> | |
525 | <mml:mo>-</mml:mo> | |
526 | <mml:mn>1</mml:mn> | |
527 | </mml:mrow> | |
528 | </mml:mfenced> | |
529 | <mml:mo></mml:mo> | |
530 | <mml:mi mathvariant="italic">c</mml:mi> | |
531 | </mml:mrow> | |
532 | </mml:math> | |
533 | </td></tr><tr><td align="left"> | |
534 | <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4_REV</code> | |
535 | </td><td align="center"> | |
536 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
537 | ||
538 | <mml:mrow> | |
539 | <mml:msup><mml:mn>2</mml:mn> | |
540 | <mml:mn>N</mml:mn> | |
541 | </mml:msup> | |
542 | <mml:mo>-</mml:mo> | |
543 | <mml:mn>1</mml:mn> | |
544 | </mml:mrow> | |
545 | </mml:math> | |
546 | </td><td align="center"> | |
547 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
548 | ||
549 | <mml:mrow> | |
550 | <mml:mfenced open="(" close=")"> | |
551 | <mml:mrow> | |
552 | <mml:msup><mml:mn>2</mml:mn> | |
553 | <mml:mn>N</mml:mn> | |
554 | </mml:msup> | |
555 | <mml:mo>-</mml:mo> | |
556 | <mml:mn>1</mml:mn> | |
557 | </mml:mrow> | |
558 | </mml:mfenced> | |
559 | <mml:mo></mml:mo> | |
560 | <mml:mi mathvariant="italic">c</mml:mi> | |
561 | </mml:mrow> | |
562 | </mml:math> | |
563 | </td></tr><tr><td align="left"> | |
564 | <code class="constant">GL_UNSIGNED_SHORT_5_5_5_1</code> | |
565 | </td><td align="center"> | |
566 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
567 | ||
568 | <mml:mrow> | |
569 | <mml:msup><mml:mn>2</mml:mn> | |
570 | <mml:mn>N</mml:mn> | |
571 | </mml:msup> | |
572 | <mml:mo>-</mml:mo> | |
573 | <mml:mn>1</mml:mn> | |
574 | </mml:mrow> | |
575 | </mml:math> | |
576 | </td><td align="center"> | |
577 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
578 | ||
579 | <mml:mrow> | |
580 | <mml:mfenced open="(" close=")"> | |
581 | <mml:mrow> | |
582 | <mml:msup><mml:mn>2</mml:mn> | |
583 | <mml:mn>N</mml:mn> | |
584 | </mml:msup> | |
585 | <mml:mo>-</mml:mo> | |
586 | <mml:mn>1</mml:mn> | |
587 | </mml:mrow> | |
588 | </mml:mfenced> | |
589 | <mml:mo></mml:mo> | |
590 | <mml:mi mathvariant="italic">c</mml:mi> | |
591 | </mml:mrow> | |
592 | </mml:math> | |
593 | </td></tr><tr><td align="left"> | |
594 | <code class="constant">GL_UNSIGNED_SHORT_1_5_5_5_REV</code> | |
595 | </td><td align="center"> | |
596 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
597 | ||
598 | <mml:mrow> | |
599 | <mml:msup><mml:mn>2</mml:mn> | |
600 | <mml:mn>N</mml:mn> | |
601 | </mml:msup> | |
602 | <mml:mo>-</mml:mo> | |
603 | <mml:mn>1</mml:mn> | |
604 | </mml:mrow> | |
605 | </mml:math> | |
606 | </td><td align="center"> | |
607 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
608 | ||
609 | <mml:mrow> | |
610 | <mml:mfenced open="(" close=")"> | |
611 | <mml:mrow> | |
612 | <mml:msup><mml:mn>2</mml:mn> | |
613 | <mml:mn>N</mml:mn> | |
614 | </mml:msup> | |
615 | <mml:mo>-</mml:mo> | |
616 | <mml:mn>1</mml:mn> | |
617 | </mml:mrow> | |
618 | </mml:mfenced> | |
619 | <mml:mo></mml:mo> | |
620 | <mml:mi mathvariant="italic">c</mml:mi> | |
621 | </mml:mrow> | |
622 | </mml:math> | |
623 | </td></tr><tr><td align="left"> | |
624 | <code class="constant">GL_UNSIGNED_INT_8_8_8_8</code> | |
625 | </td><td align="center"> | |
626 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
627 | ||
628 | <mml:mrow> | |
629 | <mml:msup><mml:mn>2</mml:mn> | |
630 | <mml:mn>N</mml:mn> | |
631 | </mml:msup> | |
632 | <mml:mo>-</mml:mo> | |
633 | <mml:mn>1</mml:mn> | |
634 | </mml:mrow> | |
635 | </mml:math> | |
636 | </td><td align="center"> | |
637 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
638 | ||
639 | <mml:mrow> | |
640 | <mml:mfenced open="(" close=")"> | |
641 | <mml:mrow> | |
642 | <mml:msup><mml:mn>2</mml:mn> | |
643 | <mml:mn>N</mml:mn> | |
644 | </mml:msup> | |
645 | <mml:mo>-</mml:mo> | |
646 | <mml:mn>1</mml:mn> | |
647 | </mml:mrow> | |
648 | </mml:mfenced> | |
649 | <mml:mo></mml:mo> | |
650 | <mml:mi mathvariant="italic">c</mml:mi> | |
651 | </mml:mrow> | |
652 | </mml:math> | |
653 | </td></tr><tr><td align="left"> | |
654 | <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code> | |
655 | </td><td align="center"> | |
656 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
657 | ||
658 | <mml:mrow> | |
659 | <mml:msup><mml:mn>2</mml:mn> | |
660 | <mml:mn>N</mml:mn> | |
661 | </mml:msup> | |
662 | <mml:mo>-</mml:mo> | |
663 | <mml:mn>1</mml:mn> | |
664 | </mml:mrow> | |
665 | </mml:math> | |
666 | </td><td align="center"> | |
667 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
668 | ||
669 | <mml:mrow> | |
670 | <mml:mfenced open="(" close=")"> | |
671 | <mml:mrow> | |
672 | <mml:msup><mml:mn>2</mml:mn> | |
673 | <mml:mn>N</mml:mn> | |
674 | </mml:msup> | |
675 | <mml:mo>-</mml:mo> | |
676 | <mml:mn>1</mml:mn> | |
677 | </mml:mrow> | |
678 | </mml:mfenced> | |
679 | <mml:mo></mml:mo> | |
680 | <mml:mi mathvariant="italic">c</mml:mi> | |
681 | </mml:mrow> | |
682 | </mml:math> | |
683 | </td></tr><tr><td align="left"> | |
684 | <code class="constant">GL_UNSIGNED_INT_10_10_10_2</code> | |
685 | </td><td align="center"> | |
686 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
687 | ||
688 | <mml:mrow> | |
689 | <mml:msup><mml:mn>2</mml:mn> | |
690 | <mml:mn>N</mml:mn> | |
691 | </mml:msup> | |
692 | <mml:mo>-</mml:mo> | |
693 | <mml:mn>1</mml:mn> | |
694 | </mml:mrow> | |
695 | </mml:math> | |
696 | </td><td align="center"> | |
697 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
698 | ||
699 | <mml:mrow> | |
700 | <mml:mfenced open="(" close=")"> | |
701 | <mml:mrow> | |
702 | <mml:msup><mml:mn>2</mml:mn> | |
703 | <mml:mn>N</mml:mn> | |
704 | </mml:msup> | |
705 | <mml:mo>-</mml:mo> | |
706 | <mml:mn>1</mml:mn> | |
707 | </mml:mrow> | |
708 | </mml:mfenced> | |
709 | <mml:mo></mml:mo> | |
710 | <mml:mi mathvariant="italic">c</mml:mi> | |
711 | </mml:mrow> | |
712 | </mml:math> | |
713 | </td></tr><tr><td align="left"> | |
714 | <code class="constant">GL_UNSIGNED_INT_2_10_10_10_REV</code> | |
715 | </td><td align="center"> | |
716 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
717 | ||
718 | <mml:mrow> | |
719 | <mml:msup><mml:mn>2</mml:mn> | |
720 | <mml:mn>N</mml:mn> | |
721 | </mml:msup> | |
722 | <mml:mo>-</mml:mo> | |
723 | <mml:mn>1</mml:mn> | |
724 | </mml:mrow> | |
725 | </mml:math> | |
726 | </td><td align="center"> | |
727 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
728 | ||
729 | <mml:mrow> | |
730 | <mml:mfenced open="(" close=")"> | |
731 | <mml:mrow> | |
732 | <mml:msup><mml:mn>2</mml:mn> | |
733 | <mml:mn>N</mml:mn> | |
734 | </mml:msup> | |
735 | <mml:mo>-</mml:mo> | |
736 | <mml:mn>1</mml:mn> | |
737 | </mml:mrow> | |
738 | </mml:mfenced> | |
739 | <mml:mo></mml:mo> | |
740 | <mml:mi mathvariant="italic">c</mml:mi> | |
741 | </mml:mrow> | |
742 | </mml:math> | |
743 | </td></tr><tr><td align="left"> | |
744 | <code class="constant">GL_UNSIGNED_INT_24_8</code> | |
745 | </td><td align="center"> | |
746 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
747 | ||
748 | <mml:mrow> | |
749 | <mml:msup><mml:mn>2</mml:mn> | |
750 | <mml:mn>N</mml:mn> | |
751 | </mml:msup> | |
752 | <mml:mo>-</mml:mo> | |
753 | <mml:mn>1</mml:mn> | |
754 | </mml:mrow> | |
755 | </mml:math> | |
756 | </td><td align="center"> | |
757 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
758 | ||
759 | <mml:mrow> | |
760 | <mml:mfenced open="(" close=")"> | |
761 | <mml:mrow> | |
762 | <mml:msup><mml:mn>2</mml:mn> | |
763 | <mml:mn>N</mml:mn> | |
764 | </mml:msup> | |
765 | <mml:mo>-</mml:mo> | |
766 | <mml:mn>1</mml:mn> | |
767 | </mml:mrow> | |
768 | </mml:mfenced> | |
769 | <mml:mo></mml:mo> | |
770 | <mml:mi mathvariant="italic">c</mml:mi> | |
771 | </mml:mrow> | |
772 | </mml:math> | |
773 | </td></tr><tr><td align="left"> | |
774 | <code class="constant">GL_UNSIGNED_INT_10F_11F_11F_REV</code> | |
775 | </td><td align="center"> | |
776 | -- | |
777 | </td><td align="left"> | |
778 | Special | |
779 | </td></tr><tr><td align="left"> | |
780 | <code class="constant">GL_UNSIGNED_INT_5_9_9_9_REV</code> | |
781 | </td><td align="center"> | |
782 | -- | |
783 | </td><td align="left"> | |
784 | Special | |
785 | </td></tr><tr><td align="left"> | |
786 | <code class="constant">GL_FLOAT_32_UNSIGNED_INT_24_8_REV</code> | |
787 | </td><td align="center"> | |
788 | none | |
789 | </td><td align="center"> | |
790 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">c</mml:mi></mml:math> (Depth Only) | |
791 | </td></tr></tbody></table></div><p> | |
792 | Return values are placed in memory as follows. | |
793 | If <em class="parameter"><code>format</code></em> is | |
794 | <code class="constant">GL_STENCIL_INDEX</code>, | |
795 | <code class="constant">GL_DEPTH_COMPONENT</code>, | |
796 | <code class="constant">GL_RED</code>, | |
797 | <code class="constant">GL_GREEN</code>, or | |
798 | <code class="constant">GL_BLUE</code>, | |
799 | a single value is returned and the data for the | |
800 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math>th | |
801 | pixel in the | |
802 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math>th | |
803 | row | |
804 | is placed in location | |
805 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
806 | ||
807 | <mml:mrow> | |
808 | <mml:mfenced open="(" close=")"> | |
809 | <mml:mi mathvariant="italic">j</mml:mi> | |
810 | </mml:mfenced> | |
811 | <mml:mo></mml:mo> | |
812 | <mml:mi mathvariant="italic">width</mml:mi> | |
813 | <mml:mo>+</mml:mo> | |
814 | <mml:mi mathvariant="italic">i</mml:mi> | |
815 | </mml:mrow> | |
816 | </mml:math>. | |
817 | <code class="constant">GL_RGB</code> and <code class="constant">GL_BGR</code> return three values, | |
818 | <code class="constant">GL_RGBA</code> and <code class="constant">GL_BGRA</code> return four values for each pixel, | |
819 | with all values corresponding to a single pixel occupying contiguous space | |
820 | in <em class="parameter"><code>data</code></em>. | |
821 | Storage parameters set by <a href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>, | |
822 | such as <code class="constant">GL_PACK_LSB_FIRST</code> and <code class="constant">GL_PACK_SWAP_BYTES</code>, | |
823 | affect the way that data is written into memory. | |
824 | See <a href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a> for a description. | |
825 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
826 | Values for pixels that lie outside the window | |
827 | connected to the current GL context are undefined. | |
828 | </p><p> | |
829 | If an error is generated, | |
830 | no change is made to the contents of <em class="parameter"><code>data</code></em>. | |
831 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
832 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>format</code></em> or <em class="parameter"><code>type</code></em> is not an | |
833 | accepted value. | |
834 | </p><p> | |
835 | <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. | |
836 | </p><p> | |
837 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>format</code></em> is <code class="constant">GL_STENCIL_INDEX</code> | |
838 | and there is no stencil buffer. | |
839 | </p><p> | |
840 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>format</code></em> is <code class="constant">GL_DEPTH_COMPONENT</code> | |
841 | and there is no depth buffer. | |
842 | </p><p> | |
843 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>format</code></em> is <code class="constant">GL_DEPTH_STENCIL</code> | |
844 | and there is no depth buffer or if there is no stencil buffer. | |
845 | </p><p> | |
846 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>format</code></em> is <code class="constant">GL_DEPTH_STENCIL</code> | |
847 | and <em class="parameter"><code>type</code></em> is not <code class="constant">GL_UNSIGNED_INT_24_8</code> or <code class="constant">GL_FLOAT_32_UNSIGNED_INT_24_8_REV</code>. | |
848 | </p><p> | |
849 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>type</code></em> is one of | |
850 | <code class="constant">GL_UNSIGNED_BYTE_3_3_2</code>, | |
851 | <code class="constant">GL_UNSIGNED_BYTE_2_3_3_REV</code>, | |
852 | <code class="constant">GL_UNSIGNED_SHORT_5_6_5</code>, or | |
853 | <code class="constant">GL_UNSIGNED_SHORT_5_6_5_REV</code> | |
854 | and <em class="parameter"><code>format</code></em> is not <code class="constant">GL_RGB</code>. | |
855 | </p><p> | |
856 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>type</code></em> is one of | |
857 | <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4</code>, | |
858 | <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4_REV</code>, | |
859 | <code class="constant">GL_UNSIGNED_SHORT_5_5_5_1</code>, | |
860 | <code class="constant">GL_UNSIGNED_SHORT_1_5_5_5_REV</code>, | |
861 | <code class="constant">GL_UNSIGNED_INT_8_8_8_8</code>, | |
862 | <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code>, | |
863 | <code class="constant">GL_UNSIGNED_INT_10_10_10_2</code>, or | |
864 | <code class="constant">GL_UNSIGNED_INT_2_10_10_10_REV</code> | |
865 | and <em class="parameter"><code>format</code></em> is neither <code class="constant">GL_RGBA</code> nor <code class="constant">GL_BGRA</code>. | |
866 | </p><p> | |
867 | <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the | |
868 | <code class="constant">GL_PIXEL_PACK_BUFFER</code> target and the buffer object's data store is currently mapped. | |
869 | </p><p> | |
870 | <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the | |
871 | <code class="constant">GL_PIXEL_PACK_BUFFER</code> target and the data would be packed to the buffer | |
872 | object such that the memory writes required would exceed the data store size. | |
873 | </p><p> | |
874 | <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the | |
875 | <code class="constant">GL_PIXEL_PACK_BUFFER</code> target and <em class="parameter"><code>data</code></em> is not evenly divisible | |
876 | into the number of bytes needed to store in memory a datum indicated by <em class="parameter"><code>type</code></em>. | |
877 | </p><p> | |
878 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="constant">GL_READ_FRAMEBUFFER_BINDING</code> | |
879 | is non-zero, the read framebuffer is complete, and the value of <code class="constant">GL_SAMPLE_BUFFERS</code> | |
880 | for the read framebuffer is greater than zero. | |
881 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
882 | <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_INDEX_MODE</code> | |
883 | </p><p> | |
884 | <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PIXEL_PACK_BUFFER_BINDING</code> | |
885 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
886 | <a href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>, | |
887 | <a href="glReadBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glReadBuffer</span></span></a> | |
888 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
889 | Copyright <span class="trademark"></span>© 1991-2006 | |
890 | Silicon Graphics, Inc. This document is licensed under the SGI | |
891 | Free Software B License. For details, see | |
892 | <a href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
893 | </p></div></div></body></html> |