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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
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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>glMapGrid</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glMapGrid"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glMapGrid — define a one- or two-dimensional mesh</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">glMapGrid1d</b>(</code></td><td>GLint </td><td><var class="pdparam">un</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">u1</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">u2</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glMapGrid1f</b>(</code></td><td>GLint </td><td><var class="pdparam">un</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">u1</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">u2</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glMapGrid2d</b>(</code></td><td>GLint </td><td><var class="pdparam">un</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">u1</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">u2</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">vn</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">v1</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">v2</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glMapGrid2f</b>(</code></td><td>GLint </td><td><var class="pdparam">un</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">u1</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">u2</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">vn</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">v1</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">v2</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>un</code></em></span></dt><dd><p> | |
4 | Specifies the number of partitions in the grid range interval | |
5 | [<em class="parameter"><code>u1</code></em>, <em class="parameter"><code>u2</code></em>]. | |
6 | Must be positive. | |
7 | </p></dd><dt><span class="term"><em class="parameter"><code>u1</code></em>, </span><span class="term"><em class="parameter"><code>u2</code></em></span></dt><dd><p> | |
8 | Specify the mappings for integer grid domain values | |
9 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
10 | ||
11 | <mml:mrow> | |
12 | <mml:mi mathvariant="italic">i</mml:mi> | |
13 | <mml:mo>=</mml:mo> | |
14 | <mml:mn>0</mml:mn> | |
15 | </mml:mrow> | |
16 | </mml:math> | |
17 | and | |
18 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
19 | ||
20 | <mml:mrow> | |
21 | <mml:mi mathvariant="italic">i</mml:mi> | |
22 | <mml:mo>=</mml:mo> | |
23 | <mml:mi mathvariant="italic">un</mml:mi> | |
24 | </mml:mrow> | |
25 | </mml:math>. | |
26 | </p></dd><dt><span class="term"><em class="parameter"><code>vn</code></em></span></dt><dd><p> | |
27 | Specifies the number of partitions in the grid range interval | |
28 | [<em class="parameter"><code>v1</code></em>, <em class="parameter"><code>v2</code></em>] | |
29 | (<code class="function">glMapGrid2</code> only). | |
30 | </p></dd><dt><span class="term"><em class="parameter"><code>v1</code></em>, </span><span class="term"><em class="parameter"><code>v2</code></em></span></dt><dd><p> | |
31 | Specify the mappings for integer grid domain values | |
32 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
33 | ||
34 | <mml:mrow> | |
35 | <mml:mi mathvariant="italic">j</mml:mi> | |
36 | <mml:mo>=</mml:mo> | |
37 | <mml:mn>0</mml:mn> | |
38 | </mml:mrow> | |
39 | </mml:math> | |
40 | and | |
41 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
42 | ||
43 | <mml:mrow> | |
44 | <mml:mi mathvariant="italic">j</mml:mi> | |
45 | <mml:mo>=</mml:mo> | |
46 | <mml:mi mathvariant="italic">vn</mml:mi> | |
47 | </mml:mrow> | |
48 | </mml:math> | |
49 | (<code class="function">glMapGrid2</code> only). | |
50 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
51 | <code class="function">glMapGrid</code> and <a class="citerefentry" href="glEvalMesh.xml"><span class="citerefentry"><span class="refentrytitle">glEvalMesh</span></span></a> are used together to efficiently | |
52 | generate and evaluate a series of evenly-spaced map domain values. | |
53 | <a class="citerefentry" href="glEvalMesh.xml"><span class="citerefentry"><span class="refentrytitle">glEvalMesh</span></span></a> steps through the integer domain | |
54 | of a one- or two-dimensional grid, | |
55 | whose range is the domain of the evaluation maps specified by | |
56 | <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a> and <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>. | |
57 | </p><p> | |
58 | <code class="function">glMapGrid1</code> and <code class="function">glMapGrid2</code> specify the linear grid mappings | |
59 | between the | |
60 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math> | |
61 | (or | |
62 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math> | |
63 | and | |
64 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math>) | |
65 | integer grid coordinates, | |
66 | to the | |
67 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">u</mml:mi></mml:math> | |
68 | (or | |
69 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">u</mml:mi></mml:math> | |
70 | and | |
71 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v</mml:mi></mml:math>) | |
72 | floating-point evaluation map coordinates. | |
73 | See <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a> and <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a> for details of how | |
74 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">u</mml:mi></mml:math> | |
75 | and | |
76 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v</mml:mi></mml:math> | |
77 | coordinates | |
78 | are evaluated. | |
79 | </p><p> | |
80 | <code class="function">glMapGrid1</code> specifies a single linear mapping | |
81 | such that integer grid coordinate 0 maps exactly to <em class="parameter"><code>u1</code></em>, | |
82 | and integer grid coordinate <em class="parameter"><code>un</code></em> maps exactly to <em class="parameter"><code>u2</code></em>. | |
83 | All other integer grid coordinates | |
84 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math> | |
85 | are mapped so that | |
86 | </p><p> | |
87 | </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
88 | ||
89 | <mml:mrow> | |
90 | <mml:mi mathvariant="italic">u</mml:mi> | |
91 | <mml:mo>=</mml:mo> | |
92 | <mml:mrow> | |
93 | <mml:mfrac> | |
94 | <mml:mrow> | |
95 | <mml:mi mathvariant="italic">i</mml:mi> | |
96 | <mml:mo></mml:mo> | |
97 | <mml:mfenced open="(" close=")"> | |
98 | <mml:mrow> | |
99 | <mml:mi mathvariant="italic">u2</mml:mi> | |
100 | <mml:mo>-</mml:mo> | |
101 | <mml:mi mathvariant="italic">u1</mml:mi> | |
102 | </mml:mrow> | |
103 | </mml:mfenced> | |
104 | </mml:mrow> | |
105 | <mml:mi mathvariant="italic">un</mml:mi> | |
106 | </mml:mfrac> | |
107 | <mml:mo>+</mml:mo> | |
108 | <mml:mi mathvariant="italic">u1</mml:mi> | |
109 | </mml:mrow> | |
110 | </mml:mrow> | |
111 | </mml:math></div><p> | |
112 | </p><p> | |
113 | <code class="function">glMapGrid2</code> specifies two such linear mappings. | |
114 | One maps integer grid coordinate | |
115 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
116 | ||
117 | <mml:mrow> | |
118 | <mml:mi mathvariant="italic">i</mml:mi> | |
119 | <mml:mo>=</mml:mo> | |
120 | <mml:mn>0</mml:mn> | |
121 | </mml:mrow> | |
122 | </mml:math> | |
123 | exactly to <em class="parameter"><code>u1</code></em>, | |
124 | and integer grid coordinate | |
125 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
126 | ||
127 | <mml:mrow> | |
128 | <mml:mi mathvariant="italic">i</mml:mi> | |
129 | <mml:mo>=</mml:mo> | |
130 | <mml:mi mathvariant="italic">un</mml:mi> | |
131 | </mml:mrow> | |
132 | </mml:math> | |
133 | exactly to <em class="parameter"><code>u2</code></em>. | |
134 | The other maps integer grid coordinate | |
135 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
136 | ||
137 | <mml:mrow> | |
138 | <mml:mi mathvariant="italic">j</mml:mi> | |
139 | <mml:mo>=</mml:mo> | |
140 | <mml:mn>0</mml:mn> | |
141 | </mml:mrow> | |
142 | </mml:math> | |
143 | exactly to <em class="parameter"><code>v1</code></em>, | |
144 | and integer grid coordinate | |
145 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
146 | ||
147 | <mml:mrow> | |
148 | <mml:mi mathvariant="italic">j</mml:mi> | |
149 | <mml:mo>=</mml:mo> | |
150 | <mml:mi mathvariant="italic">vn</mml:mi> | |
151 | </mml:mrow> | |
152 | </mml:math> | |
153 | exactly to <em class="parameter"><code>v2</code></em>. | |
154 | Other integer grid coordinates | |
155 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math> | |
156 | and | |
157 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math> | |
158 | are mapped such that | |
159 | </p><p> | |
160 | </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
161 | ||
162 | <mml:mrow> | |
163 | <mml:mi mathvariant="italic">u</mml:mi> | |
164 | <mml:mo>=</mml:mo> | |
165 | <mml:mrow> | |
166 | <mml:mfrac> | |
167 | <mml:mrow> | |
168 | <mml:mi mathvariant="italic">i</mml:mi> | |
169 | <mml:mo></mml:mo> | |
170 | <mml:mfenced open="(" close=")"> | |
171 | <mml:mrow> | |
172 | <mml:mi mathvariant="italic">u2</mml:mi> | |
173 | <mml:mo>-</mml:mo> | |
174 | <mml:mi mathvariant="italic">u1</mml:mi> | |
175 | </mml:mrow> | |
176 | </mml:mfenced> | |
177 | </mml:mrow> | |
178 | <mml:mi mathvariant="italic">un</mml:mi> | |
179 | </mml:mfrac> | |
180 | <mml:mo>+</mml:mo> | |
181 | <mml:mi mathvariant="italic">u1</mml:mi> | |
182 | </mml:mrow> | |
183 | </mml:mrow> | |
184 | </mml:math></div><p> | |
185 | </p><p> | |
186 | </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
187 | ||
188 | <mml:mrow> | |
189 | <mml:mi mathvariant="italic">v</mml:mi> | |
190 | <mml:mo>=</mml:mo> | |
191 | <mml:mrow> | |
192 | <mml:mfrac> | |
193 | <mml:mrow> | |
194 | <mml:mi mathvariant="italic">j</mml:mi> | |
195 | <mml:mo></mml:mo> | |
196 | <mml:mfenced open="(" close=")"> | |
197 | <mml:mrow> | |
198 | <mml:mi mathvariant="italic">v2</mml:mi> | |
199 | <mml:mo>-</mml:mo> | |
200 | <mml:mi mathvariant="italic">v1</mml:mi> | |
201 | </mml:mrow> | |
202 | </mml:mfenced> | |
203 | </mml:mrow> | |
204 | <mml:mi mathvariant="italic">vn</mml:mi> | |
205 | </mml:mfrac> | |
206 | <mml:mo>+</mml:mo> | |
207 | <mml:mi mathvariant="italic">v1</mml:mi> | |
208 | </mml:mrow> | |
209 | </mml:mrow> | |
210 | </mml:math></div><p> | |
211 | </p><p> | |
212 | The mappings specified by <code class="function">glMapGrid</code> are used identically by | |
213 | <a class="citerefentry" href="glEvalMesh.xml"><span class="citerefentry"><span class="refentrytitle">glEvalMesh</span></span></a> and <a class="citerefentry" href="glEvalPoint.xml"><span class="citerefentry"><span class="refentrytitle">glEvalPoint</span></span></a>. | |
214 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
215 | <code class="constant">GL_INVALID_VALUE</code> is generated if either <em class="parameter"><code>un</code></em> or <em class="parameter"><code>vn</code></em> is not | |
216 | positive. | |
217 | </p><p> | |
218 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glMapGrid</code> | |
219 | is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> | |
220 | and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
221 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
222 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAP1_GRID_DOMAIN</code> | |
223 | </p><p> | |
224 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAP2_GRID_DOMAIN</code> | |
225 | </p><p> | |
226 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAP1_GRID_SEGMENTS</code> | |
227 | </p><p> | |
228 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAP2_GRID_SEGMENTS</code> | |
229 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
230 | <a class="citerefentry" href="glEvalCoord.xml"><span class="citerefentry"><span class="refentrytitle">glEvalCoord</span></span></a>, | |
231 | <a class="citerefentry" href="glEvalMesh.xml"><span class="citerefentry"><span class="refentrytitle">glEvalMesh</span></span></a>, | |
232 | <a class="citerefentry" href="glEvalPoint.xml"><span class="citerefentry"><span class="refentrytitle">glEvalPoint</span></span></a>, | |
233 | <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>, | |
234 | <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a> | |
235 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
236 | Copyright <span class="trademark"></span>© 1991-2006 | |
237 | Silicon Graphics, Inc. This document is licensed under the SGI | |
238 | Free Software B License. For details, see | |
239 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
240 | </p></div></div></body></html> |