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pref=
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renderer=
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"text/css" href=
"opengl-man.css" /><title>textureProjGradOffset - 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=
"textureProjGradOffsetGrad"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>textureProjGradOffset — perform a texture lookup with projection, explicit gradients and 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">textureProjGradOffset
</b>(
</code></td><td>gsampler1D
</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>,
</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" style=
"padding-bottom: 1em"><tr><td><code class=
"funcdef">gvec4
<b class=
"fsfunc">textureProjGradOffset
</b>(
</code></td><td>gsampler1D
</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">dPdx
</var>,
</td></tr><tr><td> </td><td>float
</td><td><var class=
"pdparam">dPdy
</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" style=
"padding-bottom: 1em"><tr><td><code class=
"funcdef">gvec4
<b class=
"fsfunc">textureProjGradOffset
</b>(
</code></td><td>gsampler2D
</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>,
</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">gvec4
<b class=
"fsfunc">textureProjGradOffset
</b>(
</code></td><td>gsampler2D
</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">dPdx
</var>,
</td></tr><tr><td> </td><td>vec2
</td><td><var class=
"pdparam">dPdy
</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">gvec4
<b class=
"fsfunc">textureProjGradOffset
</b>(
</code></td><td>gsampler3D
</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>,
</td></tr><tr><td> </td><td>ivec3
</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">textureProjGradOffset
</b>(
</code></td><td>sampler1DShadow
</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">dPdx
</var>,
</td></tr><tr><td> </td><td>float
</td><td><var class=
"pdparam">dPdy
</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" style=
"padding-bottom: 1em"><tr><td><code class=
"funcdef">float
<b class=
"fsfunc">textureProjGradOffset
</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>vec2
</td><td><var class=
"pdparam">dPdx
</var>,
</td></tr><tr><td> </td><td>vec2
</td><td><var class=
"pdparam">dPdy
</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">gvec4
<b class=
"fsfunc">textureProjGradOffset
</b>(
</code></td><td>gsampler2DRect
</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>,
</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">gvec4
<b class=
"fsfunc">textureProjGradOffset
</b>(
</code></td><td>gsampler2DRect
</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">dPdx
</var>,
</td></tr><tr><td> </td><td>vec2
</td><td><var class=
"pdparam">dPdy
</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"><tr><td><code class=
"funcdef">float
<b class=
"fsfunc">textureProjGradOffset
</b>(
</code></td><td>gsampler2DRectShadow
</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">dPdx
</var>,
</td></tr><tr><td> </td><td>vec2
</td><td><var class=
"pdparam">dPdy
</var>,
</td></tr><tr><td> </td><td>ivec2
</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>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><dt><span class=
"term"><em class=
"parameter"><code>offset
</code></em></span></dt><dd><p>
13 Specifies the offsets, in texels at which the texture will be sampled relative to the projection of
<em class=
"parameter"><code>P
</code></em>.
14 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
15 <code class=
"function">textureProjGradOffset
</code> performs a texture lookup with projection and explicit gradients and offsets. The texture coordinates
16 consumed from
<em class=
"parameter"><code>P
</code></em>, not including the last component of
<em class=
"parameter"><code>P
</code></em>,
17 are divided by the last component of
<em class=
"parameter"><code>P
</code></em>. The resulting
<mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:msup><mml:mn>3</mml:mn><mml:mi>rd
</mml:mi></mml:msup></mml:math>
18 component of
<em class=
"parameter"><code>P
</code></em> in the shadow forms is used as
19 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:msub><mml:mi>D
</mml:mi><mml:mi>ref
</mml:mi></mml:msub></mml:math>.
20 After these values are computed, the texture lookup proceeds as in
<a href=
"textureGradOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureGradOffset
</span></span></a>,
21 passing
<em class=
"parameter"><code>dPdx
</code></em> and
<em class=
"parameter"><code>dPdy
</code></em> as gradients, and
<em class=
"parameter"><code>offset
</code></em> as the offset.
22 </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">textureProjGradOffset
</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">textureProjGradOffset (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>
23 <a href=
"texelFetch.xml"><span class=
"citerefentry"><span class=
"refentrytitle">texelFetch
</span></span></a>,
24 <a href=
"texelFetchOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">texelFetchOffset
</span></span></a>,
25 <a href=
"texture.xml"><span class=
"citerefentry"><span class=
"refentrytitle">texture
</span></span></a>,
26 <a href=
"textureGather.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureGather
</span></span></a>,
27 <a href=
"textureGatherOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureGatherOffset
</span></span></a>,
28 <a href=
"textureGatherOffsets.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureGatherOffsets
</span></span></a>,
29 <a href=
"textureGrad.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureGrad
</span></span></a>,
30 <a href=
"textureGradOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureGradOffset
</span></span></a>,
31 <a href=
"textureLod.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureLod
</span></span></a>,
32 <a href=
"textureLodOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureLodOffset
</span></span></a>,
33 <a href=
"textureOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureOffset
</span></span></a>,
34 <a href=
"textureProj.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureProj
</span></span></a>,
35 <a href=
"textureProjGrad.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureProjGrad
</span></span></a>,
36 <a href=
"textureProjLod.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureProjLod
</span></span></a>,
37 <a href=
"textureProjLodOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureProjLodOffset
</span></span></a>,
38 <a href=
"textureProjOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureProjOffset
</span></span></a>,
39 <a href=
"textureQueryLod.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureQueryLod
</span></span></a>,
40 <a href=
"textureSize.xml"><span class=
"citerefentry"><span class=
"refentrytitle">textureSize
</span></span></a>
41 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
42 Copyright
<span class=
"trademark"></span>©
2011 Khronos Group.
43 This material may be distributed subject to the terms and conditions set forth in
44 the Open Publication License, v
1.0,
8 June
1999.
45 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
46 </p></div></div></body></html>
HCoop / clinton / guile-figl.git / blob