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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
2 | <!-- saved from url=(0013)about:internet --> | |
3 | <?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" /><title>glCopyTexSubImage1D</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glCopyTexSubImage1D"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCopyTexSubImage1D — copy a one-dimensional texture subimage</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">glCopyTexSubImage1D</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">x</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">y</var>, </td></tr><tr><td> </td><td>GLsizei </td><td><var class="pdparam">width</var><code>)</code>;</td></tr></table></div></div><p> | |
4 | </p><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_1D</code>. | |
7 | </p></dd><dt><span class="term"><em class="parameter"><code>level</code></em></span></dt><dd><p> | |
8 | Specifies the level-of-detail number. | |
9 | Level 0 is the base image level. | |
10 | Level <span class="emphasis"><em>n</em></span> is the <span class="emphasis"><em>n</em></span>th mipmap reduction image. | |
11 | </p></dd><dt><span class="term"><em class="parameter"><code>xoffset</code></em></span></dt><dd><p> | |
12 | Specifies the texel offset within the texture array. | |
13 | </p></dd><dt><span class="term"><em class="parameter"><code>x</code></em>, </span><span class="term"><em class="parameter"><code>y</code></em></span></dt><dd><p> | |
14 | Specify the window coordinates of the left corner | |
15 | of the row of pixels to be copied. | |
16 | </p></dd><dt><span class="term"><em class="parameter"><code>width</code></em></span></dt><dd><p> | |
17 | Specifies the width of the texture subimage. | |
18 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
19 | <code class="function">glCopyTexSubImage1D</code> replaces a portion of a one-dimensional | |
20 | texture image with pixels from the current <code class="constant">GL_READ_BUFFER</code> (rather | |
21 | than from main memory, as is the case for <a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>). | |
22 | </p><p> | |
23 | The screen-aligned pixel row with left corner at (<em class="parameter"><code>x</code></em>,\ <em class="parameter"><code>y</code></em>), and with | |
24 | length <em class="parameter"><code>width</code></em> replaces the portion of the | |
25 | texture array with x indices <em class="parameter"><code>xoffset</code></em> through | |
26 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
27 | ||
28 | <mml:mrow> | |
29 | <mml:mi mathvariant="italic">xoffset</mml:mi> | |
30 | <mml:mo>+</mml:mo> | |
31 | <mml:mi mathvariant="italic">width</mml:mi> | |
32 | <mml:mo>-</mml:mo> | |
33 | <mml:mn>1</mml:mn> | |
34 | </mml:mrow> | |
35 | </mml:math>, | |
36 | inclusive. The destination in the texture array may not | |
37 | include any texels outside the texture array as it was | |
38 | originally specified. | |
39 | </p><p> | |
40 | The pixels in the row are processed exactly as if | |
41 | <a class="citerefentry" href="glCopyPixels.xml"><span class="citerefentry"><span class="refentrytitle">glCopyPixels</span></span></a> had been called, but the process stops just before | |
42 | final conversion. | |
43 | At this point, all pixel component values are clamped to the range | |
44 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
45 | ||
46 | <mml:mfenced open="[" close="]"> | |
47 | <mml:mn>0</mml:mn> | |
48 | <mml:mn>1</mml:mn> | |
49 | </mml:mfenced> | |
50 | </mml:math> | |
51 | and then converted to the texture's internal format for storage in the texel | |
52 | array. | |
53 | </p><p> | |
54 | It is not an error to specify a subtexture with zero width, but | |
55 | such a specification has no effect. | |
56 | If any of the pixels within the specified row of the current | |
57 | <code class="constant">GL_READ_BUFFER</code> are outside the read window associated with the current | |
58 | rendering context, then the values obtained for those pixels are undefined. | |
59 | </p><p> | |
60 | No change is made to the <span class="emphasis"><em>internalformat</em></span>, <span class="emphasis"><em>width</em></span>, | |
61 | or <span class="emphasis"><em>border</em></span> parameters of the specified texture | |
62 | array or to texel values outside the specified subregion. | |
63 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
64 | <code class="function">glCopyTexSubImage1D</code> is available only if the GL version is 1.1 or greater. | |
65 | </p><p> | |
66 | Texturing has no effect in color index mode. | |
67 | </p><p> | |
68 | <a class="citerefentry" href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a> and <a class="citerefentry" href="glPixelTransfer.xml"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a> modes affect texture images | |
69 | in exactly the way they affect <a class="citerefentry" href="glDrawPixels.xml"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>. | |
70 | </p><p> | |
71 | When the <code class="code">ARB_imaging</code> extension is supported, the RGBA components | |
72 | copied from the framebuffer may be processed by the imaging pipeline. See | |
73 | <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a> for specific details. | |
74 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
75 | <code class="constant">GL_INVALID_ENUM</code> is generated if /<em class="parameter"><code>target</code></em> is not <code class="constant">GL_TEXTURE_1D</code>. | |
76 | </p><p> | |
77 | <code class="constant">GL_INVALID_OPERATION</code> is generated if the texture array has not | |
78 | been defined by a previous <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a> or <a class="citerefentry" href="glCopyTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a> operation. | |
79 | </p><p> | |
80 | <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>level</code></em> is less than 0. | |
81 | </p><p> | |
82 | <code class="constant">GL_INVALID_VALUE</code> may be generated if | |
83 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
84 | ||
85 | <mml:mrow> | |
86 | <mml:mi mathvariant="italic">level</mml:mi> | |
87 | <mml:mo>></mml:mo> | |
88 | <mml:mrow> | |
89 | <mml:msub><mml:mi mathvariant="italic">log</mml:mi> | |
90 | <mml:mn>2</mml:mn> | |
91 | </mml:msub> | |
92 | <mml:mo></mml:mo> | |
93 | <mml:mfenced open="(" close=")"> | |
94 | <mml:mi mathvariant="italic">max</mml:mi> | |
95 | </mml:mfenced> | |
96 | </mml:mrow> | |
97 | </mml:mrow> | |
98 | </mml:math>, | |
99 | where <span class="emphasis"><em>max</em></span> is the returned value of <code class="constant">GL_MAX_TEXTURE_SIZE</code>. | |
100 | </p><p> | |
101 | <code class="constant">GL_INVALID_VALUE</code> is generated if | |
102 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
103 | ||
104 | <mml:mrow> | |
105 | <mml:mi mathvariant="italic">xoffset</mml:mi> | |
106 | <mml:mo><</mml:mo> | |
107 | <mml:mrow> | |
108 | <mml:mo>-</mml:mo> | |
109 | <mml:mi mathvariant="italic">b</mml:mi> | |
110 | </mml:mrow> | |
111 | </mml:mrow> | |
112 | </mml:math>, | |
113 | or | |
114 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
115 | ||
116 | <mml:mrow> | |
117 | <mml:mfenced open="(" close=")"> | |
118 | <mml:mrow> | |
119 | <mml:mi mathvariant="italic">xoffset</mml:mi> | |
120 | <mml:mo>+</mml:mo> | |
121 | <mml:mi mathvariant="italic">width</mml:mi> | |
122 | </mml:mrow> | |
123 | </mml:mfenced> | |
124 | <mml:mo>></mml:mo> | |
125 | <mml:mfenced open="(" close=")"> | |
126 | <mml:mrow> | |
127 | <mml:mi mathvariant="italic">w</mml:mi> | |
128 | <mml:mo>-</mml:mo> | |
129 | <mml:mi mathvariant="italic">b</mml:mi> | |
130 | </mml:mrow> | |
131 | </mml:mfenced> | |
132 | </mml:mrow> | |
133 | </mml:math>, | |
134 | where | |
135 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">w</mml:mi></mml:math> | |
136 | is the <code class="constant">GL_TEXTURE_WIDTH</code> and | |
137 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">b</mml:mi></mml:math> | |
138 | is the <code class="constant">GL_TEXTURE_BORDER</code> | |
139 | of the texture image being modified. | |
140 | Note that | |
141 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">w</mml:mi></mml:math> | |
142 | includes twice the border width. | |
143 | </p><p> | |
144 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
145 | <a class="citerefentry" href="glGetTexImage.xml"><span class="citerefentry"><span class="refentrytitle">glGetTexImage</span></span></a> | |
146 | </p><p> | |
147 | <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_TEXTURE_1D</code> | |
148 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
149 | <a class="citerefentry" href="glCopyPixels.xml"><span class="citerefentry"><span class="refentrytitle">glCopyPixels</span></span></a>, | |
150 | <a class="citerefentry" href="glCopyTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a>, | |
151 | <a class="citerefentry" href="glCopyTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>, | |
152 | <a class="citerefentry" href="glCopyTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>, | |
153 | <a class="citerefentry" href="glCopyTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>, | |
154 | <a class="citerefentry" href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>, | |
155 | <a class="citerefentry" href="glPixelTransfer.xml"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>, | |
156 | <a class="citerefentry" href="glReadBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glReadBuffer</span></span></a>, | |
157 | <a class="citerefentry" href="glTexEnv.xml"><span class="citerefentry"><span class="refentrytitle">glTexEnv</span></span></a>, | |
158 | <a class="citerefentry" href="glTexGen.xml"><span class="citerefentry"><span class="refentrytitle">glTexGen</span></span></a>, | |
159 | <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>, | |
160 | <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, | |
161 | <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>, | |
162 | <a class="citerefentry" href="glTexParameter.xml"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>, | |
163 | <a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>, | |
164 | <a class="citerefentry" href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, | |
165 | <a class="citerefentry" href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a> | |
166 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
167 | Copyright <span class="trademark"></span>© 1991-2006 | |
168 | Silicon Graphics, Inc. This document is licensed under the SGI | |
169 | Free Software B License. For details, see | |
170 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
171 | </p></div></div></body></html> |