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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>glGenerateMipmap</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glGenerateMipmap"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGenerateMipmap — generate mipmaps for a specified texture target</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><p><code class="funcdef">void <b class="fsfunc">glGenerateMipmap</b>(</code>GLenum <var class="pdparam">target</var><code>)</code>;</p></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 to which the texture whose mimaps to generate is bound. <em class="parameter"><code>target</code></em> must | |
6 | be <code class="constant">GL_TEXTURE_1D</code>, <code class="constant">GL_TEXTURE_2D</code>, <code class="constant">GL_TEXTURE_3D</code>, | |
7 | <code class="constant">GL_TEXTURE_1D_ARRAY</code>, <code class="constant">GL_TEXTURE_2D_ARRAY</code> or | |
8 | <code class="constant">GL_TEXTURE_CUBE_MAP</code>. | |
9 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
10 | <code class="function">glGenerateMipmap</code> generates mipmaps for the texture attached | |
11 | to <em class="parameter"><code>target</code></em> of the active texture unit. For cube map textures, | |
12 | a <code class="constant">GL_INVALID_OPERATION</code> error is generated if the texture | |
13 | attached to <em class="parameter"><code>target</code></em> is not cube complete. | |
14 | </p><p> | |
15 | Mipmap generation replaces texel array levels | |
16 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
17 | ||
18 | <mml:mrow> | |
19 | <mml:msub> | |
20 | <mml:mi mathvariant="italic">level</mml:mi> | |
21 | <mml:mi>base</mml:mi> | |
22 | </mml:msub> | |
23 | <mml:mo>+</mml:mo> | |
24 | <mml:mn>1</mml:mn> | |
25 | </mml:mrow> | |
26 | </mml:math> | |
27 | through | |
28 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
29 | <mml:mrow> | |
30 | <mml:mi mathvariant="italic">q</mml:mi> | |
31 | </mml:mrow> | |
32 | </mml:math> | |
33 | with arrays derived from the | |
34 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
35 | ||
36 | <mml:mrow> | |
37 | <mml:msub> | |
38 | <mml:mi mathvariant="italic">level</mml:mi> | |
39 | <mml:mi>base</mml:mi> | |
40 | </mml:msub> | |
41 | </mml:mrow> | |
42 | </mml:math> | |
43 | array, regardless of their previous contents. All other mimap arrays, | |
44 | including the | |
45 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
46 | ||
47 | <mml:mrow> | |
48 | <mml:msub> | |
49 | <mml:mi mathvariant="italic">level</mml:mi> | |
50 | <mml:mi>base</mml:mi> | |
51 | </mml:msub> | |
52 | </mml:mrow> | |
53 | </mml:math> | |
54 | array, are left unchanged by this computation. | |
55 | </p><p> | |
56 | The internal formats of the derived mipmap arrays all match those of the | |
57 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
58 | ||
59 | <mml:mrow> | |
60 | <mml:msub> | |
61 | <mml:mi mathvariant="italic">level</mml:mi> | |
62 | <mml:mi>base</mml:mi> | |
63 | </mml:msub> | |
64 | </mml:mrow> | |
65 | </mml:math> | |
66 | array. The contents of the derived arrays are computed by repeated, filtered | |
67 | reduction of the | |
68 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
69 | ||
70 | <mml:mrow> | |
71 | <mml:msub> | |
72 | <mml:mi mathvariant="italic">level</mml:mi> | |
73 | <mml:mi>base</mml:mi> | |
74 | </mml:msub> | |
75 | </mml:mrow> | |
76 | </mml:math> | |
77 | array. For one- and two-dimensional texture arrays, each layer is filtered | |
78 | independently. | |
79 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
80 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>target</code></em> is not | |
81 | one of the accepted texture targets. | |
82 | </p><p> | |
83 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>target</code></em> is | |
84 | <code class="constant">GL_TEXTURE_CUBE_MAP</code> and the texture bound to the <code class="constant">GL_TEXTURE_CUBE_MAP</code> | |
85 | target of the active texture unit is not cube complete. | |
86 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
87 | <a href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, | |
88 | <a href="glBindTexture.xml"><span class="citerefentry"><span class="refentrytitle">glBindTexture</span></span></a>, | |
89 | <a href="glGenTextures.xml"><span class="citerefentry"><span class="refentrytitle">glGenTextures</span></span></a> | |
90 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
91 | Copyright <span class="trademark"></span>© 2010 Khronos Group. | |
92 | This material may be distributed subject to the terms and conditions set forth in | |
93 | the Open Publication License, v 1.0, 8 June 1999. | |
94 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
95 | </p></div></div></body></html> |