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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>textureOffset - 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="textureOffset"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>textureOffset — perform a texture lookup with offset</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">textureOffset</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>int </td><td><var class="pdparam">offset</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">textureOffset</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>ivec2 </td><td><var class="pdparam">offset</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">textureOffset</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>ivec3 </td><td><var class="pdparam">offset</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">textureOffset</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>, </td></tr><tr><td> </td><td>ivec2 </td><td><var class="pdparam">offset</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">textureOffset</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>, </td></tr><tr><td> </td><td>ivec2 </td><td><var class="pdparam">offset</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">textureOffset</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>int </td><td><var class="pdparam">offset</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">textureOffset</b>(</code></td><td>sampler2DShadow </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>ivec2 </td><td><var class="pdparam">offset</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">textureOffset</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>int </td><td><var class="pdparam">offset</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">textureOffset</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>ivec2 </td><td><var class="pdparam">offset</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">textureOffset</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>int </td><td><var class="pdparam">offset</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">textureOffset</b>(</code></td><td>sampler2DArrayShadow </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>vec2 </td><td><var class="pdparam">offset</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>offset</code></em></span></dt><dd><p> |
| 9 | Specifies offset, in texels that will be applied to <em class="parameter"><code>P</code></em> before looking up the texel. |
| 10 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> |
| 11 | <code class="function">textureOffset</code> performs a texture lookup at coordinate <em class="parameter"><code>P</code></em> from the |
| 12 | texture bound to <em class="parameter"><code>sampler</code></em> with an an additional offset, specified in texels in <em class="parameter"><code>offset</code></em> |
| 13 | that will be applied to the (u, v, w) texture coordinates before looking up each texel. |
| 14 | The offset value must be a constant expression. A limited range of offset values are supported; |
| 15 | the minimum and maximum offset values are implementation-dependent and may be determined |
| 16 | by querying <code class="constant">GL_MIN_PROGRAM_TEXEL_OFFSET</code> and <code class="constant">GL_MAX_PROGRAM_TEXEL_OFFSET</code>, |
| 17 | respectively. |
| 18 | </p><p> |
| 19 | Note that <em class="parameter"><code>offset</code></em> does not apply to the layer coordinate for texture arrays. Also note |
| 20 | that offsets are not supported for cube maps. |
| 21 | </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">textureOffset</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">textureOffset (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></thead></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> |
| 22 | <a href="texelFetch.xml"><span class="citerefentry"><span class="refentrytitle">texelFetch</span></span></a>, |
| 23 | <a href="texelFetchOffset.xml"><span class="citerefentry"><span class="refentrytitle">texelFetchOffset</span></span></a>, |
| 24 | <a href="texture.xml"><span class="citerefentry"><span class="refentrytitle">texture</span></span></a>, |
| 25 | <a href="textureGather.xml"><span class="citerefentry"><span class="refentrytitle">textureGather</span></span></a>, |
| 26 | <a href="textureGatherOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureGatherOffset</span></span></a>, |
| 27 | <a href="textureGatherOffsets.xml"><span class="citerefentry"><span class="refentrytitle">textureGatherOffsets</span></span></a>, |
| 28 | <a href="textureGrad.xml"><span class="citerefentry"><span class="refentrytitle">textureGrad</span></span></a>, |
| 29 | <a href="textureGradOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureGradOffset</span></span></a>, |
| 30 | <a href="textureLod.xml"><span class="citerefentry"><span class="refentrytitle">textureLod</span></span></a>, |
| 31 | <a href="textureLodOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureLodOffset</span></span></a>, |
| 32 | <a href="textureProj.xml"><span class="citerefentry"><span class="refentrytitle">textureProj</span></span></a>, |
| 33 | <a href="textureProjGrad.xml"><span class="citerefentry"><span class="refentrytitle">textureProjGrad</span></span></a>, |
| 34 | <a href="textureProjGradOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjGradOffset</span></span></a>, |
| 35 | <a href="textureProjLod.xml"><span class="citerefentry"><span class="refentrytitle">textureProjLod</span></span></a>, |
| 36 | <a href="textureProjLodOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjLodOffset</span></span></a>, |
| 37 | <a href="textureProjOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjOffset</span></span></a>, |
| 38 | <a href="textureQueryLod.xml"><span class="citerefentry"><span class="refentrytitle">textureQueryLod</span></span></a>, |
| 39 | <a href="textureSize.xml"><span class="citerefentry"><span class="refentrytitle">textureSize</span></span></a> |
| 40 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> |
| 41 | Copyright <span class="trademark"></span>© 2011-2012 Khronos Group. |
| 42 | This material may be distributed subject to the terms and conditions set forth in |
| 43 | the Open Publication License, v 1.0, 8 June 1999. |
| 44 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. |
| 45 | </p></div></div></body></html> |