Commit | Line | Data |
---|---|---|
7faf1d71 AW |
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>textureGrad - 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="textureGrad"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>textureGrad — perform a texture lookup with explicit gradients</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">textureGrad</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">dPdx</var>, </td></tr><tr><td> </td><td>float </td><td><var class="pdparam">dPdy</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">textureGrad</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>vec2 </td><td><var class="pdparam">dPdx</var>, </td></tr><tr><td> </td><td>vec2 </td><td><var class="pdparam">dPdy</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">textureGrad</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>vec3 </td><td><var class="pdparam">dPdx</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">dPdy</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">textureGrad</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>vec3 </td><td><var class="pdparam">dPdx</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">dPdy</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">textureGrad</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>vec2 </td><td><var class="pdparam">dPdx</var>, </td></tr><tr><td> </td><td>vec2 </td><td><var class="pdparam">dPdy</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">textureGrad</b>(</code></td><td>gsampler2DRectShadow </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>vec2 </td><td><var class="pdparam">dPdx</var>, </td></tr><tr><td> </td><td>vec2 </td><td><var class="pdparam">dPdy</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">textureGrad</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">dPdx</var>, </td></tr><tr><td> </td><td>float </td><td><var class="pdparam">dPdy</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">textureGrad</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>vec2 </td><td><var class="pdparam">dPdx</var>, </td></tr><tr><td> </td><td>vec2 </td><td><var class="pdparam">dPdy</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">textureGrad</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">dPdx</var>, </td></tr><tr><td> </td><td>float </td><td><var class="pdparam">dPdy</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">textureGrad</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>vec2 </td><td><var class="pdparam">dPdx</var>, </td></tr><tr><td> </td><td>vec2 </td><td><var class="pdparam">dPdy</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">textureGrad</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">dPdx</var>, </td></tr><tr><td> </td><td>float </td><td><var class="pdparam">dPdy</var><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">gvec4 <b class="fsfunc">textureGrad</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>vec3 </td><td><var class="pdparam">dPdx</var>, </td></tr><tr><td> </td><td>vec3 </td><td><var class="pdparam">dPdy</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>dPdx</code></em></span></dt><dd><p> | |
9 | Specifies the partial derivative of <em class="parameter"><code>P</code></em> with respect to window x. | |
10 | </p></dd><dt><span class="term"><em class="parameter"><code>dPdy</code></em></span></dt><dd><p> | |
11 | Specifies the partial derivative of <em class="parameter"><code>P</code></em> with respect to window y. | |
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">textureGrad</code> performs a texture lookup at coordinate <em class="parameter"><code>P</code></em> from the | |
14 | texture bound to <em class="parameter"><code>sampler</code></em> with explicit texture coordinate gradiends as specified in | |
15 | <em class="parameter"><code>dPdx</code></em> and <em class="parameter"><code>dPdy</code></em>. Set: | |
16 | </p><p> | |
17 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
18 | <mml:mfrac> | |
19 | <mml:mi>δs</mml:mi> | |
20 | <mml:mi>δx</mml:mi> | |
21 | </mml:mfrac> | |
22 | <mml:mo>=</mml:mo> | |
23 | <mml:mfrac> | |
24 | <mml:mi>δP</mml:mi> | |
25 | <mml:mi>δx</mml:mi> | |
26 | </mml:mfrac> | |
27 | <mml:mi> for a 1D texture, </mml:mi> | |
28 | <mml:mfrac> | |
29 | <mml:mi>δP.s</mml:mi> | |
30 | <mml:mi>δx</mml:mi> | |
31 | </mml:mfrac> | |
32 | <mml:mi> otherwise</mml:mi> | |
33 | </mml:math> | |
34 | </p><p> | |
35 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
36 | <mml:mfrac> | |
37 | <mml:mi>δs</mml:mi> | |
38 | <mml:mi>δy</mml:mi> | |
39 | </mml:mfrac> | |
40 | <mml:mo>=</mml:mo> | |
41 | <mml:mfrac> | |
42 | <mml:mi>δP</mml:mi> | |
43 | <mml:mi>δy</mml:mi> | |
44 | </mml:mfrac> | |
45 | <mml:mi> for a 1D texture, </mml:mi> | |
46 | <mml:mfrac> | |
47 | <mml:mi>δP.s</mml:mi> | |
48 | <mml:mi>δy</mml:mi> | |
49 | </mml:mfrac> | |
50 | <mml:mi> otherwise</mml:mi> | |
51 | </mml:math> | |
52 | </p><p> | |
53 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
54 | <mml:mfrac> | |
55 | <mml:mi>δt</mml:mi> | |
56 | <mml:mi>δx</mml:mi> | |
57 | </mml:mfrac> | |
58 | <mml:mo>=</mml:mo> | |
59 | <mml:mn>0.0</mml:mn> | |
60 | <mml:mi> for a 1D texture, </mml:mi> | |
61 | <mml:mfrac> | |
62 | <mml:mi>δP.t</mml:mi> | |
63 | <mml:mi>δx</mml:mi> | |
64 | </mml:mfrac> | |
65 | <mml:mi> otherwise</mml:mi> | |
66 | </mml:math> | |
67 | </p><p> | |
68 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
69 | <mml:mfrac> | |
70 | <mml:mi>δt</mml:mi> | |
71 | <mml:mi>δy</mml:mi> | |
72 | </mml:mfrac> | |
73 | <mml:mo>=</mml:mo> | |
74 | <mml:mn>0.0</mml:mn> | |
75 | <mml:mi> for a 1D texture, </mml:mi> | |
76 | <mml:mfrac> | |
77 | <mml:mi>δP.t</mml:mi> | |
78 | <mml:mi>δy</mml:mi> | |
79 | </mml:mfrac> | |
80 | <mml:mi> otherwise</mml:mi> | |
81 | </mml:math> | |
82 | </p><p> | |
83 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
84 | <mml:mfrac> | |
85 | <mml:mi>δr</mml:mi> | |
86 | <mml:mi>δx</mml:mi> | |
87 | </mml:mfrac> | |
88 | <mml:mo>=</mml:mo> | |
89 | <mml:mn>0.0</mml:mn> | |
90 | <mml:mi> for a 1D or 2D texture, </mml:mi> | |
91 | <mml:mfrac> | |
92 | <mml:mi>δP.p</mml:mi> | |
93 | <mml:mi>δx</mml:mi> | |
94 | </mml:mfrac> | |
95 | <mml:mi> otherwise</mml:mi> | |
96 | </mml:math> | |
97 | </p><p> | |
98 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
99 | <mml:mfrac> | |
100 | <mml:mi>δr</mml:mi> | |
101 | <mml:mi>δy</mml:mi> | |
102 | </mml:mfrac> | |
103 | <mml:mo>=</mml:mo> | |
104 | <mml:mn>0.0</mml:mn> | |
105 | <mml:mi> for a 1D or 2D texture, </mml:mi> | |
106 | <mml:mfrac> | |
107 | <mml:mi>δP.p</mml:mi> | |
108 | <mml:mi>δy</mml:mi> | |
109 | </mml:mfrac> | |
110 | <mml:mi> otherwise</mml:mi> | |
111 | </mml:math> | |
112 | </p><p> | |
113 | For the cube version, the partial derivatives of <em class="parameter"><code>P</code></em> are assumed to be | |
114 | in the coordinate system used before texture coordinates are projected onto the appropriate | |
115 | cube face. | |
116 | </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">textureGrad</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">textureGrad (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">textureGrad (gsamplerCubeArray)</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> | |
117 | <a href="texelFetch.xml"><span class="citerefentry"><span class="refentrytitle">texelFetch</span></span></a>, | |
118 | <a href="texelFetchOffset.xml"><span class="citerefentry"><span class="refentrytitle">texelFetchOffset</span></span></a>, | |
119 | <a href="texture.xml"><span class="citerefentry"><span class="refentrytitle">texture</span></span></a>, | |
120 | <a href="textureGather.xml"><span class="citerefentry"><span class="refentrytitle">textureGather</span></span></a>, | |
121 | <a href="textureGatherOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureGatherOffset</span></span></a>, | |
122 | <a href="textureGatherOffsets.xml"><span class="citerefentry"><span class="refentrytitle">textureGatherOffsets</span></span></a>, | |
123 | <a href="textureGradOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureGradOffset</span></span></a>, | |
124 | <a href="textureLod.xml"><span class="citerefentry"><span class="refentrytitle">textureLod</span></span></a>, | |
125 | <a href="textureLodOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureLodOffset</span></span></a>, | |
126 | <a href="textureOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureOffset</span></span></a>, | |
127 | <a href="textureProj.xml"><span class="citerefentry"><span class="refentrytitle">textureProj</span></span></a>, | |
128 | <a href="textureProjGrad.xml"><span class="citerefentry"><span class="refentrytitle">textureProjGrad</span></span></a>, | |
129 | <a href="textureProjGradOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjGradOffset</span></span></a>, | |
130 | <a href="textureProjLod.xml"><span class="citerefentry"><span class="refentrytitle">textureProjLod</span></span></a>, | |
131 | <a href="textureProjLodOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjLodOffset</span></span></a>, | |
132 | <a href="textureProjOffset.xml"><span class="citerefentry"><span class="refentrytitle">textureProjOffset</span></span></a>, | |
133 | <a href="textureQueryLod.xml"><span class="citerefentry"><span class="refentrytitle">textureQueryLod</span></span></a>, | |
134 | <a href="textureSize.xml"><span class="citerefentry"><span class="refentrytitle">textureSize</span></span></a> | |
135 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
136 | Copyright <span class="trademark"></span>© 2011 Khronos Group. | |
137 | This material may be distributed subject to the terms and conditions set forth in | |
138 | the Open Publication License, v 1.0, 8 June 1999. | |
139 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
140 | </p></div></div></body></html> |