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1 | <?xml version="1.0" encoding="UTF-8"?> |
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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>glCompressedTexSubImage2D</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glCompressedTexSubImage2D"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCompressedTexSubImage2D — specify a two-dimensional texture subimage in a compressed format</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glCompressedTexSubImage2D</b>(</code></td><td>GLenum </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">level</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">xoffset</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">yoffset</var>, </td></tr><tr><td> </td><td>GLsizei </td><td><var class="pdparam">width</var>, </td></tr><tr><td> </td><td>GLsizei </td><td><var class="pdparam">height</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">format</var>, </td></tr><tr><td> </td><td>GLsizei </td><td><var class="pdparam">imageSize</var>, </td></tr><tr><td> </td><td>const GLvoid * </td><td><var class="pdparam">data</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>target</code></em></span></dt><dd><p> | |
5 | Specifies the target texture. | |
6 | Must be <code class="constant">GL_TEXTURE_2D</code>, | |
7 | <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_X</code>, | |
8 | <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_X</code>, | |
9 | <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Y</code>, | |
10 | <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</code>, | |
11 | <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Z</code>, or | |
12 | <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>. | |
13 | </p></dd><dt><span class="term"><em class="parameter"><code>level</code></em></span></dt><dd><p> | |
14 | Specifies the level-of-detail number. | |
15 | Level 0 is the base image level. | |
16 | Level <span class="emphasis"><em>n</em></span> is the <span class="emphasis"><em>n</em></span>th mipmap reduction image. | |
17 | </p></dd><dt><span class="term"><em class="parameter"><code>xoffset</code></em></span></dt><dd><p> | |
18 | Specifies a texel offset in the x direction within the texture array. | |
19 | </p></dd><dt><span class="term"><em class="parameter"><code>yoffset</code></em></span></dt><dd><p> | |
20 | Specifies a texel offset in the y direction within the texture array. | |
21 | </p></dd><dt><span class="term"><em class="parameter"><code>width</code></em></span></dt><dd><p> | |
22 | Specifies the width of the texture subimage. | |
23 | </p></dd><dt><span class="term"><em class="parameter"><code>height</code></em></span></dt><dd><p> | |
24 | Specifies the height of the texture subimage. | |
25 | </p></dd><dt><span class="term"><em class="parameter"><code>format</code></em></span></dt><dd><p> | |
26 | Specifies the format of the compressed image data stored at address <em class="parameter"><code>data</code></em>. | |
27 | </p></dd><dt><span class="term"><em class="parameter"><code>imageSize</code></em></span></dt><dd><p> | |
28 | Specifies the number of unsigned bytes of image data starting at the | |
29 | address specified by <em class="parameter"><code>data</code></em>. | |
30 | </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p> | |
31 | Specifies a pointer to the compressed image data in memory. | |
32 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
33 | Texturing allows elements of an image array to be read by shaders. | |
34 | </p><p> | |
35 | <code class="function">glCompressedTexSubImage2D</code> redefines a contiguous subregion of an existing two-dimensional | |
36 | texture image. The texels referenced by <em class="parameter"><code>data</code></em> replace the portion of the | |
37 | existing texture array with x indices <em class="parameter"><code>xoffset</code></em> and | |
38 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
39 | ||
40 | <mml:mrow> | |
41 | <mml:mi mathvariant="italic">xoffset</mml:mi> | |
42 | <mml:mo>+</mml:mo> | |
43 | <mml:mi mathvariant="italic">width</mml:mi> | |
44 | <mml:mo>-</mml:mo> | |
45 | <mml:mn>1</mml:mn> | |
46 | </mml:mrow> | |
47 | </mml:math>, | |
48 | and the y indices <em class="parameter"><code>yoffset</code></em> and | |
49 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
50 | ||
51 | <mml:mrow> | |
52 | <mml:mi mathvariant="italic">yoffset</mml:mi> | |
53 | <mml:mo>+</mml:mo> | |
54 | <mml:mi mathvariant="italic">height</mml:mi> | |
55 | <mml:mo>-</mml:mo> | |
56 | <mml:mn>1</mml:mn> | |
57 | </mml:mrow> | |
58 | </mml:math>, | |
59 | inclusive. | |
60 | This region may not include any texels | |
61 | outside the range of the texture array as it was originally specified. It | |
62 | is not an error to specify a subtexture with width of 0, but such a | |
63 | specification has no effect. | |
64 | </p><p> | |
65 | <em class="parameter"><code>internalformat</code></em> must be a known compressed image format (such as <code class="constant">GL_RGTC</code>) | |
66 | or an extension-specified compressed-texture format. | |
67 | The <em class="parameter"><code>format</code></em> of the compressed texture | |
68 | image is selected by the GL implementation that compressed it (see | |
69 | <a href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>) and should be queried at the time the texture was | |
70 | compressed with <a href="glGetTexLevelParameter.xml"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a>. | |
71 | </p><p> | |
72 | If a non-zero named buffer object is bound to the <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target | |
73 | (see <a href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>) while a texture image is | |
74 | specified, <em class="parameter"><code>data</code></em> is treated as a byte offset into the buffer object's data store. | |
75 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
76 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>internalformat</code></em> is of the generic compressed internal formats: | |
77 | <code class="constant">GL_COMPRESSED_RED</code>, | |
78 | <code class="constant">GL_COMPRESSED_RG</code>, | |
79 | <code class="constant">GL_COMPRESSED_RGB</code>, | |
80 | <code class="constant">GL_COMPRESSED_RGBA</code>. | |
81 | <code class="constant">GL_COMPRESSED_SRGB</code>, or | |
82 | <code class="constant">GL_COMPRESSED_SRGB_ALPHA</code>. | |
83 | </p><p> | |
84 | <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>imageSize</code></em> is not consistent with | |
85 | the format, dimensions, and contents of the specified compressed image | |
86 | data. | |
87 | </p><p> | |
88 | <code class="constant">GL_INVALID_OPERATION</code> is generated if parameter combinations are not | |
89 | supported by the specific compressed internal format as specified in the | |
90 | specific texture compression extension. | |
91 | </p><p> | |
92 | <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the | |
93 | <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and the buffer object's data store is currently mapped. | |
94 | </p><p> | |
95 | <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the | |
96 | <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and the data would be unpacked from the buffer | |
97 | object such that the memory reads required would exceed the data store size. | |
98 | </p><p> | |
99 | Undefined results, including abnormal program termination, are generated if | |
100 | <em class="parameter"><code>data</code></em> is not encoded in a manner consistent with the extension | |
101 | specification defining the internal compression format. | |
102 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
103 | <a href="glGetCompressedTexImage.xml"><span class="citerefentry"><span class="refentrytitle">glGetCompressedTexImage</span></span></a> | |
104 | </p><p> | |
105 | <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_TEXTURE_COMPRESSED</code> | |
106 | </p><p> | |
107 | <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PIXEL_UNPACK_BUFFER_BINDING</code> | |
108 | </p><p> | |
109 | <a href="glGetTexLevelParameter.xml"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a> with arguments <code class="constant">GL_TEXTURE_INTERNAL_FORMAT</code> | |
110 | and <code class="constant">GL_TEXTURE_COMPRESSED_IMAGE_SIZE</code> | |
111 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
112 | <a href="glActiveTexture.xml"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>, | |
113 | <a href="glCompressedTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage1D</span></span></a>, | |
114 | <a href="glCompressedTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage2D</span></span></a>, | |
115 | <a href="glCompressedTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage3D</span></span></a>, | |
116 | <a href="glCompressedTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage1D</span></span></a>, | |
117 | <a href="glCompressedTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage3D</span></span></a>, | |
118 | <a href="glCopyTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a>, | |
119 | <a href="glCopyTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>, | |
120 | <a href="glCopyTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage1D</span></span></a>, | |
121 | <a href="glCopyTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>, | |
122 | <a href="glCopyTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>, | |
123 | <a href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>, | |
124 | <a href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, | |
125 | <a href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>, | |
126 | <a href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>, | |
127 | <a href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, | |
128 | <a href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>, | |
129 | <a href="glTexParameter.xml"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a> | |
130 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
131 | Copyright <span class="trademark"></span>© 1991-2006 | |
132 | Silicon Graphics, Inc. This document is licensed under the SGI | |
133 | Free Software B License. For details, see | |
134 | <a href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
135 | </p></div></div></body></html> |