HCoop / clinton / guile-figl.git / blame
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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"> | |
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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>texture - OpenGL Shading Language (GLSL)</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="texture"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>texture — retrieves texels from a texture</p></div><div class="refsynopsisdiv"><h2>Declaration</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">texture</b>(</code></td><td>gsampler1D </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>float </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">texture</b>(</code></td><td>gsampler2D </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec2 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">texture</b>(</code></td><td>gsampler3D </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">texture</b>(</code></td><td>gsamplerCube </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">float <b class="fsfunc">texture</b>(</code></td><td>sampler1DShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">float <b class="fsfunc">texture</b>(</code></td><td>sampler2DShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">float <b class="fsfunc">texture</b>(</code></td><td>samplerCubeShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">texture</b>(</code></td><td>gsampler1DArray </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec2 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">texture</b>(</code></td><td>gsampler2DArray </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">texture</b>(</code></td><td>gsamplerCubeArray </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec4 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">float <b class="fsfunc">texture</b>(</code></td><td>sampler1DArrayShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">float <b class="fsfunc">texture</b>(</code></td><td>gsampler2DArrayShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec4 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>[float </td><td><var class="pdparam">bias</var>]<code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">texture</b>(</code></td><td>gsampler2DRect </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec2 </td><td><var class="pdparam">P</var><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">float <b class="fsfunc">texture</b>(</code></td><td>sampler2DRectShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">P</var><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">float <b class="fsfunc">texture</b>(</code></td><td>gsamplerCubeArrayShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>vec4 </td><td><var class="pdparam">P</var>, </td></tr><tr><td> </td><td>float </td><td><var class="pdparam">compare</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>sampler</code></em></span></dt><dd><p> | |
| 5 | Specifies the sampler to which the texture from which texels will be retrieved is bound. | |
| 6 | </p></dd><dt><span class="term"><em class="parameter"><code>P</code></em></span></dt><dd><p> | |
| 7 | Specifies the texture coordinates at which texture will be sampled. | |
| 8 | </p></dd><dt><span class="term"><em class="parameter"><code>bias</code></em></span></dt><dd><p> | |
| 9 | Specifies an optional bias to be applied during level-of-detail computation. | |
| 10 | </p></dd><dt><span class="term"><em class="parameter"><code>compare</code></em></span></dt><dd><p> | |
| 11 | Specifies the value to which the fetched texel will be compared when sampling from <code class="code">gsamplerCubeArrayShadow</code>. | |
| 12 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
| 13 | <code class="function">texture</code> samples texels from the texture bound to <em class="parameter"><code>sampler</code></em> at texture | |
| 14 | coordinate <em class="parameter"><code>P</code></em>. An optional bias, specified in <em class="parameter"><code>bias</code></em> is included in | |
| 15 | the level-of-detail computation that is used to choose mipmap(s) from which to sample. | |
| 16 | </p><p> | |
| 17 | For <span class="emphasis"><em>shadow</em></span> forms, when <em class="parameter"><code>compare</code></em> is present, it is used as | |
| 18 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:msub><mml:mi>D</mml:mi><mml:mi>sub</mml:mi></mml:msub></mml:math> | |
| 19 | and the array layer is specified in <code class="code"><em class="parameter"><code>P</code></em>.w</code>. When <em class="parameter"><code>compare</code></em> is | |
| 20 | not present, the last component of <em class="parameter"><code>P</code></em> is used as | |
| 21 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:msub><mml:mi>D</mml:mi><mml:mi>sub</mml:mi></mml:msub></mml:math> and the | |
| 22 | array layer is specified in the second to last component of <em class="parameter"><code>P</code></em>. (The second component of <em class="parameter"><code>P</code></em> | |
| 23 | is unused for <span class="emphasis"><em>1D</em></span> shadow lookups.) | |
| 24 | </p><p> | |
| 25 | For non-shadow variants, the array layer comes from the last component of <em class="parameter"><code>P</code></em>. | |
| 26 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="versions"></a><h2>Version Support</h2><div class="informaltable"><table border="1"><colgroup><col align="left" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /></colgroup><thead><tr><th align="left"><span class="bold"><strong>Function</strong></span></th><th align="left"><span class="bold"><strong>Version 1.10</strong></span></th><th align="left"><span class="bold"><strong>Version 1.20</strong></span></th><th align="left"><span class="bold"><strong>Version 1.30</strong></span></th><th align="left"><span class="bold"><strong>Version 1.40</strong></span></th><th align="left"><span class="bold"><strong>Version 1.50</strong></span></th><th align="left"><span class="bold"><strong>Version 3.30</strong></span></th><th align="left"><span class="bold"><strong>Version 4.00</strong></span></th><th align="left"><span class="bold"><strong>Version 4.10</strong></span></th><th align="left"><span class="bold"><strong>Version 4.20</strong></span></th><th align="center"><span class="bold"><strong>Version 4.30</strong></span></th></tr><tr><th align="left">texture</th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th></tr><tr><th align="left">texture (gsampler2DRect{Shadow})</th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th></tr><tr><th align="left">texture (gsampler2DMS, gsampler2DMSArray)</th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th></tr><tr><th align="left">texture (gsamplerCubeArray{Shadow})</th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th></tr></thead></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
| 27 | <a href="texelFetch.xml"><span class="citerefentry"><span class="refentrytitle">texelFetch</span></span></a>, | |
| 28 | <a href="texelFetchOffset.xml"><span class="citerefentry"><span class="refentrytitle">texelFetchOffset</span></span></a>, | |
| 29 | <a href="textureGather.xml"><span class="citerefentry"><span class="refentrytitle">textureGather</span></span></a>, | |
| 30 | <a href="textureGatherOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureGatherOffset</span></span></a>, | |
| 31 | <a href="textureGatherOffsets.xml"><span class="citerefentry"><span class="refentrytitle">textureGatherOffsets</span></span></a>, | |
| 32 | <a href="textureGrad.xml"><span class="citerefentry"><span class="refentrytitle">textureGrad</span></span></a>, | |
| 33 | <a href="textureGradOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureGradOffset</span></span></a>, | |
| 34 | <a href="textureLod.xml"><span class="citerefentry"><span class="refentrytitle">textureLod</span></span></a>, | |
| 35 | <a href="textureLodOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureLodOffset</span></span></a>, | |
| 36 | <a href="textureOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureOffset</span></span></a>, | |
| 37 | <a href="textureProj.xml"><span class="citerefentry"><span class="refentrytitle">textureProj</span></span></a>, | |
| 38 | <a href="textureProjGrad.xml"><span class="citerefentry"><span class="refentrytitle">textureProjGrad</span></span></a>, | |
| 39 | <a href="textureProjGradOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjGradOffset</span></span></a>, | |
| 40 | <a href="textureProjLod.xml"><span class="citerefentry"><span class="refentrytitle">textureProjLod</span></span></a>, | |
| 41 | <a href="textureProjLodOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjLodOffset</span></span></a>, | |
| 42 | <a href="textureProjOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjOffset</span></span></a>, | |
| 43 | <a href="textureQueryLod.xml"><span class="citerefentry"><span class="refentrytitle">textureQueryLod</span></span></a>, | |
| 44 | <a href="textureSize.xml"><span class="citerefentry"><span class="refentrytitle">textureSize</span></span></a> | |
| 45 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
| 46 | Copyright <span class="trademark"></span>© 2011 Khronos Group. | |
| 47 | This material may be distributed subject to the terms and conditions set forth in | |
| 48 | the Open Publication License, v 1.0, 8 June 1999. | |
| 49 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
| 50 | </p></div></div></body></html> |