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pref=
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renderer=
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"Content-Type" content=
"text/html; charset=UTF-8" /><link rel=
"stylesheet" type=
"text/css" href=
"opengl-man.css" /><title>imageLoad - 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=
"imageLoad"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>imageLoad — load a single texel from an image
</p></div><div class=
"refsynopsisdiv"><h2>Declaration
</h2><div class=
"funcsynopsis"><p><code class=
"funcdef">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code>gimage1D
<var class=
"pdparam">image
</var>, int
<var class=
"pdparam">P
</var><code>)
</code>;
</p><p><code class=
"funcdef">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code>gimage2D
<var class=
"pdparam">image
</var>, ivec2
<var class=
"pdparam">P
</var><code>)
</code>;
</p><p><code class=
"funcdef">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code>gimage3D
<var class=
"pdparam">image
</var>, ivec3
<var class=
"pdparam">P
</var><code>)
</code>;
</p><p><code class=
"funcdef">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code>gimage2DRect
<var class=
"pdparam">image
</var>, ivec2
<var class=
"pdparam">P
</var><code>)
</code>;
</p><p><code class=
"funcdef">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code>gimageCube
<var class=
"pdparam">image
</var>, ivec3
<var class=
"pdparam">P
</var><code>)
</code>;
</p><p><code class=
"funcdef">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code>gbufferImage
<var class=
"pdparam">image
</var>, int
<var class=
"pdparam">P
</var><code>)
</code>;
</p><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0" style=
"padding-bottom: 1em"><tr><td><code class=
"funcdef">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code></td><td>gimage1DArray
</td><td><var class=
"pdparam">image
</var>,
</td></tr><tr><td> </td><td>ivec2
</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">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code></td><td>gimage2DArray
</td><td><var class=
"pdparam">image
</var>,
</td></tr><tr><td> </td><td>ivec3
</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">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code></td><td>gimageCubeArray
</td><td><var class=
"pdparam">image
</var>,
</td></tr><tr><td> </td><td>ivec3
</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">gvec4
<b class=
"fsfunc">imageLoad
</b>(
</code></td><td>gimage2DMS
</td><td><var class=
"pdparam">image
</var>,
</td></tr><tr><td> </td><td>ivec2
</td><td><var class=
"pdparam">P
</var>,
</td></tr><tr><td> </td><td>int
</td><td><var class=
"pdparam">sample
</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">imageLoad
</b>(
</code></td><td>gimage2DMSArray
</td><td><var class=
"pdparam">image
</var>,
</td></tr><tr><td> </td><td>ivec3
</td><td><var class=
"pdparam">P
</var>,
</td></tr><tr><td> </td><td>int
</td><td><var class=
"pdparam">sample
</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>image
</code></em></span></dt><dd><p>
5 Specify the image unit from which to load a texel.
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>P
</code></em></span></dt><dd><p>
7 Specify the coordinate from which to load the texel.
8 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>sample
</code></em></span></dt><dd><p>
9 When present, specifies the sample within the image to load
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">imageLoad
</code> loads the texel at the coordinate
<em class=
"parameter"><code>P
</code></em> from the image
12 unit
<em class=
"parameter"><code>image
</code></em>. For multi-sample loads, the sample number is given by
<em class=
"parameter"><code>sample
</code></em>. When
13 <em class=
"parameter"><code>image
</code></em>,
<em class=
"parameter"><code>P
</code></em>,
<em class=
"parameter"><code>sample
</code></em> identify a valid texel, the bits used
14 to represent the selected texel in memory are converted to a vec4, ivec4, or uvec4 in the manner described in the OpenGL
15 Specification and returned.
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">imageLoad
</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>-
</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></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=
"imageStore.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageStore
</span></span></a>,
18 <a href=
"imageAtomicAdd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicAdd
</span></span></a>,
19 <a href=
"imageAtomicMin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicMin
</span></span></a>,
20 <a href=
"imageAtomicMax.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicMax
</span></span></a>,
21 <a href=
"imageAtomicAnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicAnd
</span></span></a>,
22 <a href=
"imageAtomicOr.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicOr
</span></span></a>,
23 <a href=
"imageAtomicXor.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicXor
</span></span></a>,
24 <a href=
"imageAtomicExchange.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicExchange
</span></span></a>,
25 <a href=
"imageAtomicCompSwap.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicCompSwap
</span></span></a>
26 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
27 Copyright
<span class=
"trademark"></span>©
2011 Khronos Group.
28 This material may be distributed subject to the terms and conditions set forth in
29 the Open Publication License, v
1.0,
8 June
1999.
30 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
31 </p></div></div></body></html>
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