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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>textureQueryLod - 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="textureQueryLod"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>textureQueryLod — compute the level-of-detail that would be used to sample 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">vec2 <b class="fsfunc">textureQueryLod</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><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">vec2 <b class="fsfunc">textureQueryLod</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><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">vec2 <b class="fsfunc">textureQueryLod</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><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">vec2 <b class="fsfunc">textureQueryLod</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><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsampler1DArray </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>float </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">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsampler2DDArray </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">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsamplerCubeArray </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" style="padding-bottom: 1em"><tr><td><code class="funcdef">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsampler1DShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>float </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">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsampler2DShadow </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">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsamplerCubeShadow </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" style="padding-bottom: 1em"><tr><td><code class="funcdef">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsampler1DArrayShadow </td><td><var class="pdparam">sampler</var>, </td></tr><tr><td> </td><td>float </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">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsampler2DArrayShadow </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"><tr><td><code class="funcdef">vec2 <b class="fsfunc">textureQueryLod</b>(</code></td><td>gsamplerCubeArrayShadow </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></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 whose level-of-detail will be queried 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 the level-of-detail will be queried. | |
8 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
9 | <span class="emphasis"><em>Available only in the fragment shader</em></span>, | |
10 | <code class="function">textureQueryLod</code> computes the level-of-detail that would be used to sample from | |
11 | a texture. The mipmap array(s) that would be accessed is returned in the <span class="emphasis"><em>x</em></span> component | |
12 | of the return value. The computed level-of-detail relative to the base level is returned in the | |
13 | <span class="emphasis"><em>y</em></span> component of the return value. | |
14 | </p><p> | |
15 | If called on an incomplete texture, the result of the operation is undefined. | |
16 | </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">textureQueryLod</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> | |
17 | <a href="texelFetch.xml"><span class="citerefentry"><span class="refentrytitle">texelFetch</span></span></a>, | |
18 | <a href="texelFetchOffset.xml"><span class="citerefentry"><span class="refentrytitle">texelFetchOffset</span></span></a>, | |
19 | <a href="texture.xml"><span class="citerefentry"><span class="refentrytitle">texture</span></span></a>, | |
20 | <a href="textureGather.xml"><span class="citerefentry"><span class="refentrytitle">textureGather</span></span></a>, | |
21 | <a href="textureGatherOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureGatherOffset</span></span></a>, | |
22 | <a href="textureGatherOffsets.xml"><span class="citerefentry"><span class="refentrytitle">textureGatherOffsets</span></span></a>, | |
23 | <a href="textureGrad.xml"><span class="citerefentry"><span class="refentrytitle">textureGrad</span></span></a>, | |
24 | <a href="textureGradOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureGradOffset</span></span></a>, | |
25 | <a href="textureLod.xml"><span class="citerefentry"><span class="refentrytitle">textureLod</span></span></a>, | |
26 | <a href="textureLodOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureLodOffset</span></span></a>, | |
27 | <a href="textureOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureOffset</span></span></a>, | |
28 | <a href="textureProj.xml"><span class="citerefentry"><span class="refentrytitle">textureProj</span></span></a>, | |
29 | <a href="textureProjGrad.xml"><span class="citerefentry"><span class="refentrytitle">textureProjGrad</span></span></a>, | |
30 | <a href="textureProjGradOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjGradOffset</span></span></a>, | |
31 | <a href="textureProjLod.xml"><span class="citerefentry"><span class="refentrytitle">textureProjLod</span></span></a>, | |
32 | <a href="textureProjLodOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjLodOffset</span></span></a>, | |
33 | <a href="textureProjOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjOffset</span></span></a>, | |
34 | <a href="textureSize.xml"><span class="citerefentry"><span class="refentrytitle">textureSize</span></span></a> | |
35 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
36 | Copyright <span class="trademark"></span>© 2011 Khronos Group. | |
37 | This material may be distributed subject to the terms and conditions set forth in | |
38 | the Open Publication License, v 1.0, 8 June 1999. | |
39 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
40 | </p></div></div></body></html> |