| 1 | <?xml version="1.0" encoding="UTF-8"?> |
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| 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> |