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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> | |
4 | <refentry id="glTexEnv"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>1991-2006</year> | |
9 | <holder>Silicon Graphics, Inc.</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glTexEnv</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glTexEnv</refname> | |
17 | <refpurpose>set texture environment parameters</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>glTexEnvf</function></funcdef> | |
23 | <paramdef>GLenum <parameter>target</parameter></paramdef> | |
24 | <paramdef>GLenum <parameter>pname</parameter></paramdef> | |
25 | <paramdef>GLfloat <parameter>param</parameter></paramdef> | |
26 | </funcprototype> | |
27 | </funcsynopsis> | |
28 | <para></para> | |
29 | <funcsynopsis> | |
30 | <funcprototype> | |
31 | <funcdef>void <function>glTexEnvi</function></funcdef> | |
32 | <paramdef>GLenum <parameter>target</parameter></paramdef> | |
33 | <paramdef>GLenum <parameter>pname</parameter></paramdef> | |
34 | <paramdef>GLint <parameter>param</parameter></paramdef> | |
35 | </funcprototype> | |
36 | </funcsynopsis> | |
37 | </refsynopsisdiv> | |
38 | <!-- eqn: ignoring delim $$ --> | |
39 | <refsect1 id="parameters"><title>Parameters</title> | |
40 | <variablelist> | |
41 | <varlistentry> | |
42 | <term><parameter>target</parameter></term> | |
43 | <listitem> | |
44 | <para> | |
45 | Specifies a texture environment. | |
46 | May be <constant>GL_TEXTURE_ENV</constant>, <constant>GL_TEXTURE_FILTER_CONTROL</constant> or <constant>GL_POINT_SPRITE</constant>. | |
47 | </para> | |
48 | </listitem> | |
49 | </varlistentry> | |
50 | <varlistentry> | |
51 | <term><parameter>pname</parameter></term> | |
52 | <listitem> | |
53 | <para> | |
54 | Specifies the symbolic name of a single-valued texture environment parameter. | |
55 | May be either <constant>GL_TEXTURE_ENV_MODE</constant>, <constant>GL_TEXTURE_LOD_BIAS</constant>, | |
56 | <constant>GL_COMBINE_RGB</constant>, | |
57 | <constant>GL_COMBINE_ALPHA</constant>, | |
58 | <constant>GL_SRC0_RGB</constant>, | |
59 | <constant>GL_SRC1_RGB</constant>, | |
60 | <constant>GL_SRC2_RGB</constant>, | |
61 | <constant>GL_SRC0_ALPHA</constant>, | |
62 | <constant>GL_SRC1_ALPHA</constant>, | |
63 | <constant>GL_SRC2_ALPHA</constant>, | |
64 | <constant>GL_OPERAND0_RGB</constant>, | |
65 | <constant>GL_OPERAND1_RGB</constant>, | |
66 | <constant>GL_OPERAND2_RGB</constant>, | |
67 | <constant>GL_OPERAND0_ALPHA</constant>, | |
68 | <constant>GL_OPERAND1_ALPHA</constant>, | |
69 | <constant>GL_OPERAND2_ALPHA</constant>, | |
70 | <constant>GL_RGB_SCALE</constant>, | |
71 | <constant>GL_ALPHA_SCALE</constant>, or | |
72 | <constant>GL_COORD_REPLACE</constant>. | |
73 | </para> | |
74 | </listitem> | |
75 | </varlistentry> | |
76 | <varlistentry> | |
77 | <term><parameter>param</parameter></term> | |
78 | <listitem> | |
79 | <para> | |
80 | Specifies a single symbolic constant, one of <constant>GL_ADD</constant>, | |
81 | <constant>GL_ADD_SIGNED</constant>, <constant>GL_INTERPOLATE</constant>, <constant>GL_MODULATE</constant>, <constant>GL_DECAL</constant>, | |
82 | <constant>GL_BLEND</constant>, <constant>GL_REPLACE</constant>, <constant>GL_SUBTRACT</constant>, <constant>GL_COMBINE</constant>, | |
83 | <constant>GL_TEXTURE</constant>, <constant>GL_CONSTANT</constant>, <constant>GL_PRIMARY_COLOR</constant>, <constant>GL_PREVIOUS</constant>, | |
84 | <constant>GL_SRC_COLOR</constant>, <constant>GL_ONE_MINUS_SRC_COLOR</constant>, <constant>GL_SRC_ALPHA</constant>, | |
85 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant>, | |
86 | a single boolean value for the point sprite texture coordinate replacement, | |
87 | a single floating-point value for the texture level-of-detail bias, | |
88 | or 1.0, 2.0, or 4.0 when specifying the <constant>GL_RGB_SCALE</constant> or <constant>GL_ALPHA_SCALE</constant>. | |
89 | </para> | |
90 | </listitem> | |
91 | </varlistentry> | |
92 | </variablelist> | |
93 | </refsect1> | |
94 | <refsynopsisdiv><title>C Specification</title> | |
95 | <funcsynopsis> | |
96 | <funcprototype> | |
97 | <funcdef>void <function>glTexEnvfv</function></funcdef> | |
98 | <paramdef>GLenum <parameter>target</parameter></paramdef> | |
99 | <paramdef>GLenum <parameter>pname</parameter></paramdef> | |
100 | <paramdef>const GLfloat * <parameter>params</parameter></paramdef> | |
101 | </funcprototype> | |
102 | </funcsynopsis> | |
103 | <funcsynopsis> | |
104 | <funcprototype> | |
105 | <funcdef>void <function>glTexEnviv</function></funcdef> | |
106 | <paramdef>GLenum <parameter>target</parameter></paramdef> | |
107 | <paramdef>GLenum <parameter>pname</parameter></paramdef> | |
108 | <paramdef>const GLint * <parameter>params</parameter></paramdef> | |
109 | </funcprototype> | |
110 | </funcsynopsis> | |
111 | </refsynopsisdiv> | |
112 | <refsect1 id="parameters2"><title>Parameters</title> | |
113 | <variablelist> | |
114 | <varlistentry> | |
115 | <term><parameter>target</parameter></term> | |
116 | <listitem> | |
117 | <para> | |
118 | Specifies a texture environment. | |
119 | May be either <constant>GL_TEXTURE_ENV</constant>, or <constant>GL_TEXTURE_FILTER_CONTROL</constant>. | |
120 | </para> | |
121 | </listitem> | |
122 | </varlistentry> | |
123 | <varlistentry> | |
124 | <term><parameter>pname</parameter></term> | |
125 | <listitem> | |
126 | <para> | |
127 | Specifies the symbolic name of a texture environment parameter. | |
128 | Accepted values are <constant>GL_TEXTURE_ENV_MODE</constant>, <constant>GL_TEXTURE_ENV_COLOR</constant>, or | |
129 | <constant>GL_TEXTURE_LOD_BIAS</constant>. | |
130 | </para> | |
131 | </listitem> | |
132 | </varlistentry> | |
133 | <varlistentry> | |
134 | <term><parameter>params</parameter></term> | |
135 | <listitem> | |
136 | <para> | |
137 | Specifies a pointer to a parameter array that contains | |
138 | either a single symbolic constant, single floating-point number, or an RGBA | |
139 | color. | |
140 | </para> | |
141 | </listitem> | |
142 | </varlistentry> | |
143 | </variablelist> | |
144 | </refsect1> | |
145 | <refsect1 id="description"><title>Description</title> | |
146 | <para> | |
147 | A texture environment specifies how texture values are interpreted when a | |
148 | fragment is textured. When <parameter>target</parameter> is <constant>GL_TEXTURE_FILTER_CONTROL</constant>, | |
149 | <parameter>pname</parameter> must be <constant>GL_TEXTURE_LOD_BIAS</constant>. When <parameter>target</parameter> is | |
150 | <constant>GL_TEXTURE_ENV</constant>, <parameter>pname</parameter> can be <constant>GL_TEXTURE_ENV_MODE</constant>, | |
151 | <constant>GL_TEXTURE_ENV_COLOR</constant>, <constant>GL_COMBINE_RGB</constant>, <constant>GL_COMBINE_ALPHA</constant>, | |
152 | <constant>GL_RGB_SCALE</constant>, <constant>GL_ALPHA_SCALE</constant>, | |
153 | <constant>GL_SRC0_RGB</constant>, <constant>GL_SRC1_RGB</constant>, <constant>GL_SRC2_RGB</constant>, | |
154 | <constant>GL_SRC0_ALPHA</constant>, <constant>GL_SRC1_ALPHA</constant>, or <constant>GL_SRC2_ALPHA</constant>. | |
155 | </para> | |
156 | <para> | |
157 | If <parameter>pname</parameter> is <constant>GL_TEXTURE_ENV_MODE</constant>, | |
158 | then <parameter>params</parameter> is (or points to) the symbolic name of a texture function. | |
159 | Six texture functions may be specified: | |
160 | <constant>GL_ADD</constant>, | |
161 | <constant>GL_MODULATE</constant>, | |
162 | <constant>GL_DECAL</constant>, | |
163 | <constant>GL_BLEND</constant>, | |
164 | <constant>GL_REPLACE</constant>, or | |
165 | <constant>GL_COMBINE</constant>. | |
166 | </para> | |
167 | <para> | |
168 | The following table shows the correspondence of filtered texture | |
169 | values | |
170 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
171 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
172 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
173 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
174 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
175 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
176 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
177 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
178 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi> | |
179 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
180 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi> | |
181 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
182 | to texture source components. | |
183 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
184 | <mml:mi mathvariant="italic">s</mml:mi></mml:msub></mml:math></inlineequation> | |
185 | and | |
186 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
187 | <mml:mi mathvariant="italic">s</mml:mi></mml:msub></mml:math></inlineequation> | |
188 | are used by the texture functions described below. | |
189 | </para> | |
190 | <para> | |
191 | </para> | |
192 | <informaltable frame="topbot"> | |
193 | <tgroup cols="3" align="left"> | |
194 | <colspec/> | |
195 | <colspec/> | |
196 | <thead> | |
197 | <row> | |
198 | <entry rowsep="1" align="left"> | |
199 | Texture Base Internal Format | |
200 | </entry> | |
201 | <entry rowsep="1" align="center"> | |
202 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="bold-italic">C</mml:mi> | |
203 | <mml:mi mathvariant="italic">s</mml:mi></mml:msub></mml:math></inlineequation> | |
204 | </entry> | |
205 | <entry rowsep="1" align="center"> | |
206 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="bold-italic">A</mml:mi> | |
207 | <mml:mi mathvariant="italic">s</mml:mi></mml:msub></mml:math></inlineequation> | |
208 | </entry> | |
209 | </row> | |
210 | </thead> | |
211 | <tbody> | |
212 | <row> | |
213 | <entry align="left"> | |
214 | <constant>GL_ALPHA</constant> | |
215 | </entry> | |
216 | <entry align="left"> | |
217 | (0, 0, 0) | |
218 | </entry> | |
219 | <entry align="left"> | |
220 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
221 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
222 | </entry> | |
223 | </row> | |
224 | <row> | |
225 | <entry align="left"> | |
226 | <constant>GL_LUMINANCE</constant> | |
227 | </entry> | |
228 | <entry align="left"> | |
229 | ( | |
230 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi> | |
231 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
232 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi> | |
233 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
234 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi> | |
235 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
236 | ) | |
237 | </entry> | |
238 | <entry align="left"> | |
239 | 1 | |
240 | </entry> | |
241 | </row> | |
242 | <row> | |
243 | <entry align="left"> | |
244 | <constant>GL_LUMINANCE_ALPHA</constant> | |
245 | </entry> | |
246 | <entry align="left"> | |
247 | ( | |
248 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi> | |
249 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
250 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi> | |
251 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
252 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi> | |
253 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
254 | ) | |
255 | </entry> | |
256 | <entry align="left"> | |
257 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
258 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
259 | </entry> | |
260 | </row> | |
261 | <row> | |
262 | <entry align="left"> | |
263 | <constant>GL_INTENSITY</constant> | |
264 | </entry> | |
265 | <entry align="left"> | |
266 | ( | |
267 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi> | |
268 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
269 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi> | |
270 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
271 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi> | |
272 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
273 | ) | |
274 | </entry> | |
275 | <entry align="left"> | |
276 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi> | |
277 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
278 | </entry> | |
279 | </row> | |
280 | <row> | |
281 | <entry align="left"> | |
282 | <constant>GL_RGB</constant> | |
283 | </entry> | |
284 | <entry align="left"> | |
285 | ( | |
286 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
287 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
288 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
289 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
290 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
291 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
292 | ) | |
293 | </entry> | |
294 | <entry align="left"> | |
295 | 1 | |
296 | </entry> | |
297 | </row> | |
298 | <row> | |
299 | <entry align="left"> | |
300 | <constant>GL_RGBA</constant> | |
301 | </entry> | |
302 | <entry align="left"> | |
303 | ( | |
304 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
305 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
306 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
307 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>, | |
308 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
309 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
310 | ) | |
311 | </entry> | |
312 | <entry align="left"> | |
313 | <inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
314 | <mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation> | |
315 | </entry> | |
316 | </row> | |
317 | </tbody> | |
318 | </tgroup> | |
319 | </informaltable> | |
320 | <para> | |
321 | A texture function acts on the fragment to be textured using | |
322 | the texture image value that applies to the fragment | |
323 | (see <citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>) | |
324 | and produces an RGBA color for that fragment. | |
325 | The following table shows how the RGBA color is produced for each | |
326 | of the first five texture functions that can be chosen. | |
327 | <inlineequation><mml:math><mml:mi mathvariant="italic">C</mml:mi></mml:math></inlineequation> | |
328 | is a triple of color values (RGB) and | |
329 | <inlineequation><mml:math><mml:mi mathvariant="italic">A</mml:mi></mml:math></inlineequation> | |
330 | is the associated alpha value. | |
331 | RGBA values extracted from a texture image are in the range [0,1]. | |
332 | The subscript | |
333 | <inlineequation><mml:math><mml:mi mathvariant="italic">p</mml:mi></mml:math></inlineequation> | |
334 | refers to the color computed from the previous texture stage (or the incoming fragment if processing texture stage 0), | |
335 | the subscript | |
336 | <inlineequation><mml:math><mml:mi mathvariant="italic">s</mml:mi></mml:math></inlineequation> | |
337 | to the texture source color, | |
338 | the subscript | |
339 | <inlineequation><mml:math><mml:mi mathvariant="italic">c</mml:mi></mml:math></inlineequation> | |
340 | to the texture environment color, | |
341 | and the subscript | |
342 | <inlineequation><mml:math><mml:mi mathvariant="italic">v</mml:mi></mml:math></inlineequation> | |
343 | indicates a value produced by the texture function. | |
344 | </para> | |
345 | <para> | |
346 | </para> | |
347 | <informaltable pgwide="1" font-size="8pt" frame="topbot"> | |
348 | <tgroup cols="7" align="left"> | |
349 | <colspec colwidth="4.1*" align="center"/> | |
350 | <colspec colwidth="1*" align="center"/> | |
351 | <colspec colwidth="2.3*" align="center"/> | |
352 | <colspec colwidth="2.7*" /> | |
353 | <colspec colwidth="3.4*" /> | |
354 | <colspec colwidth="3.5*" /> | |
355 | <colspec colwidth="1.4*" /> | |
356 | <thead> | |
357 | <row> | |
358 | <entry rowsep="1" align="center"> | |
359 | Texture Base Internal Format | |
360 | </entry> | |
361 | <entry rowsep="1" align="center"> | |
362 | <constant>Value</constant> | |
363 | </entry> | |
364 | <entry rowsep="1" align="center"> | |
365 | <constant>GL_REPLACE</constant> Function | |
366 | </entry> | |
367 | <entry rowsep="1" align="center"> | |
368 | <constant>GL_MODULATE</constant> Function | |
369 | </entry> | |
370 | <entry rowsep="1" align="center"> | |
371 | <constant>GL_DECAL</constant> Function | |
372 | </entry> | |
373 | <entry rowsep="1" align="center"> | |
374 | <constant>GL_BLEND</constant> Function | |
375 | </entry> | |
376 | <entry rowsep="1" align="center"> | |
377 | <constant>GL_ADD</constant> Function | |
378 | </entry> | |
379 | </row> | |
380 | </thead> | |
381 | <tbody> | |
382 | <row> | |
383 | <entry align="center"> | |
384 | <constant>GL_ALPHA</constant> | |
385 | </entry> | |
386 | <entry align="center"> | |
387 | <inlineequation><mml:math> | |
388 | <!-- eqn: C sub v = :--> | |
389 | <mml:mrow> | |
390 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
391 | <mml:mi mathvariant="italic">v</mml:mi> | |
392 | </mml:msub> | |
393 | <mml:mo>=</mml:mo> | |
394 | </mml:mrow> | |
395 | </mml:math></inlineequation> | |
396 | </entry> | |
397 | <entry align="center"> | |
398 | <inlineequation><mml:math> | |
399 | <!-- eqn: C sub p:--> | |
400 | <mml:mrow> | |
401 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
402 | <mml:mi mathvariant="italic">p</mml:mi> | |
403 | </mml:msub> | |
404 | </mml:mrow> | |
405 | </mml:math></inlineequation> | |
406 | </entry> | |
407 | <entry align="center"> | |
408 | <inlineequation><mml:math> | |
409 | <!-- eqn: C sub p:--> | |
410 | <mml:mrow> | |
411 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
412 | <mml:mi mathvariant="italic">p</mml:mi> | |
413 | </mml:msub> | |
414 | </mml:mrow> | |
415 | </mml:math></inlineequation> | |
416 | </entry> | |
417 | <entry align="center"> | |
418 | undefined | |
419 | </entry> | |
420 | <entry align="center"> | |
421 | <inlineequation><mml:math> | |
422 | <!-- eqn: C sub v = C sub p:--> | |
423 | <mml:mrow> | |
424 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
425 | <mml:mi mathvariant="italic">p</mml:mi> | |
426 | </mml:msub> | |
427 | </mml:mrow> | |
428 | </mml:math></inlineequation> | |
429 | </entry> | |
430 | <entry align="center"> | |
431 | <inlineequation><mml:math> | |
432 | <!-- eqn: C sub v = C sub p:--> | |
433 | <mml:mrow> | |
434 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
435 | <mml:mi mathvariant="italic">p</mml:mi> | |
436 | </mml:msub> | |
437 | </mml:mrow> | |
438 | </mml:math></inlineequation> | |
439 | </entry> | |
440 | </row> | |
441 | <row> | |
442 | <entry align="center"> | |
443 | </entry> | |
444 | <entry align="center"> | |
445 | <inlineequation><mml:math> | |
446 | <!-- eqn: A sub v = :--> | |
447 | <mml:mrow> | |
448 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
449 | <mml:mi mathvariant="italic">v</mml:mi> | |
450 | </mml:msub> | |
451 | <mml:mo>=</mml:mo> | |
452 | </mml:mrow> | |
453 | </mml:math></inlineequation> | |
454 | </entry> | |
455 | <entry align="center"> | |
456 | <inlineequation><mml:math> | |
457 | <!-- eqn: A sub v = A sub s:--> | |
458 | <mml:mrow> | |
459 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
460 | <mml:mi mathvariant="italic">s</mml:mi> | |
461 | </mml:msub> | |
462 | </mml:mrow> | |
463 | </mml:math></inlineequation> | |
464 | </entry> | |
465 | <entry align="center"> | |
466 | <inlineequation><mml:math> | |
467 | <!-- eqn: A sub v = A sub p A sub s:--> | |
468 | <mml:mrow> | |
469 | <mml:mrow> | |
470 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
471 | <mml:mi mathvariant="italic">p</mml:mi> | |
472 | </mml:msub> | |
473 | <mml:mo>⁢</mml:mo> | |
474 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
475 | <mml:mi mathvariant="italic">s</mml:mi> | |
476 | </mml:msub> | |
477 | </mml:mrow> | |
478 | </mml:mrow> | |
479 | </mml:math></inlineequation> | |
480 | </entry> | |
481 | <entry align="center"> | |
482 | </entry> | |
483 | <entry align="center"> | |
484 | <inlineequation><mml:math> | |
485 | <!-- eqn: A sub v = A sub p A sub s:--> | |
486 | <mml:mrow> | |
487 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
488 | <mml:mi mathvariant="italic">v</mml:mi> | |
489 | </mml:msub> | |
490 | <mml:mo>=</mml:mo> | |
491 | <mml:mrow> | |
492 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
493 | <mml:mi mathvariant="italic">p</mml:mi> | |
494 | </mml:msub> | |
495 | <mml:mo>⁢</mml:mo> | |
496 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
497 | <mml:mi mathvariant="italic">s</mml:mi> | |
498 | </mml:msub> | |
499 | </mml:mrow> | |
500 | </mml:mrow> | |
501 | </mml:math></inlineequation> | |
502 | </entry> | |
503 | <entry align="center"> | |
504 | <inlineequation><mml:math> | |
505 | <!-- eqn: A sub v = A sub p A sub s:--> | |
506 | <mml:mrow> | |
507 | <mml:mrow> | |
508 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
509 | <mml:mi mathvariant="italic">p</mml:mi> | |
510 | </mml:msub> | |
511 | <mml:mo>⁢</mml:mo> | |
512 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
513 | <mml:mi mathvariant="italic">s</mml:mi> | |
514 | </mml:msub> | |
515 | </mml:mrow> | |
516 | </mml:mrow> | |
517 | </mml:math></inlineequation> | |
518 | </entry> | |
519 | </row> | |
520 | <row> | |
521 | <entry align="center"> | |
522 | <constant>GL_LUMINANCE</constant> | |
523 | </entry> | |
524 | <entry align="center"> | |
525 | <inlineequation><mml:math> | |
526 | <!-- eqn: C sub v = :--> | |
527 | <mml:mrow> | |
528 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
529 | <mml:mi mathvariant="italic">v</mml:mi> | |
530 | </mml:msub> | |
531 | <mml:mo>=</mml:mo> | |
532 | </mml:mrow> | |
533 | </mml:math></inlineequation> | |
534 | </entry> | |
535 | <entry align="center"> | |
536 | <inlineequation><mml:math> | |
537 | <!-- eqn: C sub v = C sub s:--> | |
538 | <mml:mrow> | |
539 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
540 | <mml:mi mathvariant="italic">s</mml:mi> | |
541 | </mml:msub> | |
542 | </mml:mrow> | |
543 | </mml:math></inlineequation> | |
544 | </entry> | |
545 | <entry align="center"> | |
546 | <inlineequation><mml:math> | |
547 | <!-- eqn: C sub v = C sub p C sub s:--> | |
548 | <mml:mrow> | |
549 | <mml:mrow> | |
550 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
551 | <mml:mi mathvariant="italic">p</mml:mi> | |
552 | </mml:msub> | |
553 | <mml:mo>⁢</mml:mo> | |
554 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
555 | <mml:mi mathvariant="italic">s</mml:mi> | |
556 | </mml:msub> | |
557 | </mml:mrow> | |
558 | </mml:mrow> | |
559 | </mml:math></inlineequation> | |
560 | </entry> | |
561 | <entry align="center"> | |
562 | undefined | |
563 | </entry> | |
564 | <entry align="center"> | |
565 | <inlineequation><mml:math> | |
566 | <!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:--> | |
567 | <mml:mrow> | |
568 | <mml:mrow> | |
569 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
570 | <mml:mi mathvariant="italic">p</mml:mi> | |
571 | </mml:msub> | |
572 | <mml:mo>⁢</mml:mo> | |
573 | <mml:mfenced open="(" close=")"> | |
574 | <mml:mrow> | |
575 | <mml:mn>1</mml:mn> | |
576 | <mml:mo>-</mml:mo> | |
577 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
578 | <mml:mi mathvariant="italic">s</mml:mi> | |
579 | </mml:msub> | |
580 | </mml:mrow> | |
581 | </mml:mfenced> | |
582 | <mml:mo>+</mml:mo> | |
583 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
584 | <mml:mi mathvariant="italic">c</mml:mi> | |
585 | </mml:msub> | |
586 | <mml:mo>⁢</mml:mo> | |
587 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
588 | <mml:mi mathvariant="italic">s</mml:mi> | |
589 | </mml:msub> | |
590 | </mml:mrow> | |
591 | </mml:mrow> | |
592 | </mml:math></inlineequation> | |
593 | </entry> | |
594 | <entry align="center"> | |
595 | <inlineequation><mml:math> | |
596 | <!-- eqn: C sub v = C sub p + C sub s:--> | |
597 | <mml:mrow> | |
598 | <mml:mrow> | |
599 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
600 | <mml:mi mathvariant="italic">p</mml:mi> | |
601 | </mml:msub> | |
602 | <mml:mo>+</mml:mo> | |
603 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
604 | <mml:mi mathvariant="italic">s</mml:mi> | |
605 | </mml:msub> | |
606 | </mml:mrow> | |
607 | </mml:mrow> | |
608 | </mml:math></inlineequation> | |
609 | </entry> | |
610 | </row> | |
611 | <row> | |
612 | <entry align="center"> | |
613 | (or 1) | |
614 | </entry> | |
615 | <entry align="center"> | |
616 | <inlineequation><mml:math> | |
617 | <!-- eqn: A sub v = :--> | |
618 | <mml:mrow> | |
619 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
620 | <mml:mi mathvariant="italic">v</mml:mi> | |
621 | </mml:msub> | |
622 | <mml:mo>=</mml:mo> | |
623 | </mml:mrow> | |
624 | </mml:math></inlineequation> | |
625 | </entry> | |
626 | <entry align="center"> | |
627 | <inlineequation><mml:math> | |
628 | <!-- eqn: A sub v = A sub p:--> | |
629 | <mml:mrow> | |
630 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
631 | <mml:mi mathvariant="italic">p</mml:mi> | |
632 | </mml:msub> | |
633 | </mml:mrow> | |
634 | </mml:math></inlineequation> | |
635 | </entry> | |
636 | <entry align="center"> | |
637 | <inlineequation><mml:math> | |
638 | <!-- eqn: A sub v = A sub p:--> | |
639 | <mml:mrow> | |
640 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
641 | <mml:mi mathvariant="italic">p</mml:mi> | |
642 | </mml:msub> | |
643 | </mml:mrow> | |
644 | </mml:math></inlineequation> | |
645 | </entry> | |
646 | <entry align="center"> | |
647 | </entry> | |
648 | <entry align="center"> | |
649 | <inlineequation><mml:math> | |
650 | <!-- eqn: A sub v = A sub p:--> | |
651 | <mml:mrow> | |
652 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
653 | <mml:mi mathvariant="italic">p</mml:mi> | |
654 | </mml:msub> | |
655 | </mml:mrow> | |
656 | </mml:math></inlineequation> | |
657 | </entry> | |
658 | <entry align="center"> | |
659 | <inlineequation><mml:math> | |
660 | <!-- eqn: A sub v = A sub p:--> | |
661 | <mml:mrow> | |
662 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
663 | <mml:mi mathvariant="italic">p</mml:mi> | |
664 | </mml:msub> | |
665 | </mml:mrow> | |
666 | </mml:math></inlineequation> | |
667 | </entry> | |
668 | </row> | |
669 | <row> | |
670 | <entry align="center"> | |
671 | <constant>GL_LUMINANCE_ALPHA</constant> | |
672 | </entry> | |
673 | <entry align="center"> | |
674 | <inlineequation><mml:math> | |
675 | <!-- eqn: C sub v = :--> | |
676 | <mml:mrow> | |
677 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
678 | <mml:mi mathvariant="italic">v</mml:mi> | |
679 | </mml:msub> | |
680 | <mml:mo>=</mml:mo> | |
681 | </mml:mrow> | |
682 | </mml:math></inlineequation> | |
683 | </entry> | |
684 | <entry align="center"> | |
685 | <inlineequation><mml:math> | |
686 | <!-- eqn: C sub v = C sub s:--> | |
687 | <mml:mrow> | |
688 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
689 | <mml:mi mathvariant="italic">s</mml:mi> | |
690 | </mml:msub> | |
691 | </mml:mrow> | |
692 | </mml:math></inlineequation> | |
693 | </entry> | |
694 | <entry align="center"> | |
695 | <inlineequation><mml:math> | |
696 | <!-- eqn: C sub v = C sub p C sub s:--> | |
697 | <mml:mrow> | |
698 | <mml:mrow> | |
699 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
700 | <mml:mi mathvariant="italic">p</mml:mi> | |
701 | </mml:msub> | |
702 | <mml:mo>⁢</mml:mo> | |
703 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
704 | <mml:mi mathvariant="italic">s</mml:mi> | |
705 | </mml:msub> | |
706 | </mml:mrow> | |
707 | </mml:mrow> | |
708 | </mml:math></inlineequation> | |
709 | </entry> | |
710 | <entry align="center"> | |
711 | undefined | |
712 | </entry> | |
713 | <entry align="center"> | |
714 | <inlineequation><mml:math> | |
715 | <!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:--> | |
716 | <mml:mrow> | |
717 | <mml:mrow> | |
718 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
719 | <mml:mi mathvariant="italic">p</mml:mi> | |
720 | </mml:msub> | |
721 | <mml:mo>⁢</mml:mo> | |
722 | <mml:mfenced open="(" close=")"> | |
723 | <mml:mrow> | |
724 | <mml:mn>1</mml:mn> | |
725 | <mml:mo>-</mml:mo> | |
726 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
727 | <mml:mi mathvariant="italic">s</mml:mi> | |
728 | </mml:msub> | |
729 | </mml:mrow> | |
730 | </mml:mfenced> | |
731 | <mml:mo>+</mml:mo> | |
732 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
733 | <mml:mi mathvariant="italic">c</mml:mi> | |
734 | </mml:msub> | |
735 | <mml:mo>⁢</mml:mo> | |
736 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
737 | <mml:mi mathvariant="italic">s</mml:mi> | |
738 | </mml:msub> | |
739 | </mml:mrow> | |
740 | </mml:mrow> | |
741 | </mml:math></inlineequation> | |
742 | </entry> | |
743 | <entry align="center"> | |
744 | <inlineequation><mml:math> | |
745 | <!-- eqn: C sub v = C sub p + C sub s:--> | |
746 | <mml:mrow> | |
747 | <mml:mrow> | |
748 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
749 | <mml:mi mathvariant="italic">p</mml:mi> | |
750 | </mml:msub> | |
751 | <mml:mo>+</mml:mo> | |
752 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
753 | <mml:mi mathvariant="italic">s</mml:mi> | |
754 | </mml:msub> | |
755 | </mml:mrow> | |
756 | </mml:mrow> | |
757 | </mml:math></inlineequation> | |
758 | </entry> | |
759 | </row> | |
760 | <row> | |
761 | <entry align="center"> | |
762 | (or 2) | |
763 | </entry> | |
764 | <entry align="center"> | |
765 | <inlineequation><mml:math> | |
766 | <!-- eqn: A sub v = :--> | |
767 | <mml:mrow> | |
768 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
769 | <mml:mi mathvariant="italic">v</mml:mi> | |
770 | </mml:msub> | |
771 | <mml:mo>=</mml:mo> | |
772 | </mml:mrow> | |
773 | </mml:math></inlineequation> | |
774 | </entry> | |
775 | <entry align="center"> | |
776 | <inlineequation><mml:math> | |
777 | <!-- eqn: A sub v = A sub s:--> | |
778 | <mml:mrow> | |
779 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
780 | <mml:mi mathvariant="italic">s</mml:mi> | |
781 | </mml:msub> | |
782 | </mml:mrow> | |
783 | </mml:math></inlineequation> | |
784 | </entry> | |
785 | <entry align="center"> | |
786 | <inlineequation><mml:math> | |
787 | <!-- eqn: A sub v = A sub p A sub s:--> | |
788 | <mml:mrow> | |
789 | <mml:mrow> | |
790 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
791 | <mml:mi mathvariant="italic">p</mml:mi> | |
792 | </mml:msub> | |
793 | <mml:mo>⁢</mml:mo> | |
794 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
795 | <mml:mi mathvariant="italic">s</mml:mi> | |
796 | </mml:msub> | |
797 | </mml:mrow> | |
798 | </mml:mrow> | |
799 | </mml:math></inlineequation> | |
800 | </entry> | |
801 | <entry align="center"> | |
802 | </entry> | |
803 | <entry align="center"> | |
804 | <inlineequation><mml:math> | |
805 | <!-- eqn: A sub v = A sub p A sub s:--> | |
806 | <mml:mrow> | |
807 | <mml:mrow> | |
808 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
809 | <mml:mi mathvariant="italic">p</mml:mi> | |
810 | </mml:msub> | |
811 | <mml:mo>⁢</mml:mo> | |
812 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
813 | <mml:mi mathvariant="italic">s</mml:mi> | |
814 | </mml:msub> | |
815 | </mml:mrow> | |
816 | </mml:mrow> | |
817 | </mml:math></inlineequation> | |
818 | </entry> | |
819 | <entry align="center"> | |
820 | <inlineequation><mml:math> | |
821 | <!-- eqn: A sub v = A sub p A sub s:--> | |
822 | <mml:mrow> | |
823 | <mml:mrow> | |
824 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
825 | <mml:mi mathvariant="italic">p</mml:mi> | |
826 | </mml:msub> | |
827 | <mml:mo>⁢</mml:mo> | |
828 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
829 | <mml:mi mathvariant="italic">s</mml:mi> | |
830 | </mml:msub> | |
831 | </mml:mrow> | |
832 | </mml:mrow> | |
833 | </mml:math></inlineequation> | |
834 | </entry> | |
835 | </row> | |
836 | <row> | |
837 | <entry align="center"> | |
838 | <constant>GL_INTENSITY</constant> | |
839 | </entry> | |
840 | <entry align="center"> | |
841 | <inlineequation><mml:math> | |
842 | <!-- eqn: C sub v = :--> | |
843 | <mml:mrow> | |
844 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
845 | <mml:mi mathvariant="italic">v</mml:mi> | |
846 | </mml:msub> | |
847 | <mml:mo>=</mml:mo> | |
848 | </mml:mrow> | |
849 | </mml:math></inlineequation> | |
850 | </entry> | |
851 | <entry align="center"> | |
852 | <inlineequation><mml:math> | |
853 | <!-- eqn: C sub v = C sub s:--> | |
854 | <mml:mrow> | |
855 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
856 | <mml:mi mathvariant="italic">s</mml:mi> | |
857 | </mml:msub> | |
858 | </mml:mrow> | |
859 | </mml:math></inlineequation> | |
860 | </entry> | |
861 | <entry align="center"> | |
862 | <inlineequation><mml:math> | |
863 | <!-- eqn: C sub v = C sub p C sub s:--> | |
864 | <mml:mrow> | |
865 | <mml:mrow> | |
866 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
867 | <mml:mi mathvariant="italic">p</mml:mi> | |
868 | </mml:msub> | |
869 | <mml:mo>⁢</mml:mo> | |
870 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
871 | <mml:mi mathvariant="italic">s</mml:mi> | |
872 | </mml:msub> | |
873 | </mml:mrow> | |
874 | </mml:mrow> | |
875 | </mml:math></inlineequation> | |
876 | </entry> | |
877 | <entry align="center"> | |
878 | undefined | |
879 | </entry> | |
880 | <entry align="center"> | |
881 | <inlineequation><mml:math> | |
882 | <!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:--> | |
883 | <mml:mrow> | |
884 | <mml:mrow> | |
885 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
886 | <mml:mi mathvariant="italic">p</mml:mi> | |
887 | </mml:msub> | |
888 | <mml:mo>⁢</mml:mo> | |
889 | <mml:mfenced open="(" close=")"> | |
890 | <mml:mrow> | |
891 | <mml:mn>1</mml:mn> | |
892 | <mml:mo>-</mml:mo> | |
893 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
894 | <mml:mi mathvariant="italic">s</mml:mi> | |
895 | </mml:msub> | |
896 | </mml:mrow> | |
897 | </mml:mfenced> | |
898 | <mml:mo>+</mml:mo> | |
899 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
900 | <mml:mi mathvariant="italic">c</mml:mi> | |
901 | </mml:msub> | |
902 | <mml:mo>⁢</mml:mo> | |
903 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
904 | <mml:mi mathvariant="italic">s</mml:mi> | |
905 | </mml:msub> | |
906 | </mml:mrow> | |
907 | </mml:mrow> | |
908 | </mml:math></inlineequation> | |
909 | </entry> | |
910 | <entry align="center"> | |
911 | <inlineequation><mml:math> | |
912 | <!-- eqn: C sub v = C sub p + C sub s:--> | |
913 | <mml:mrow> | |
914 | <mml:mrow> | |
915 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
916 | <mml:mi mathvariant="italic">p</mml:mi> | |
917 | </mml:msub> | |
918 | <mml:mo>+</mml:mo> | |
919 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
920 | <mml:mi mathvariant="italic">s</mml:mi> | |
921 | </mml:msub> | |
922 | </mml:mrow> | |
923 | </mml:mrow> | |
924 | </mml:math></inlineequation> | |
925 | </entry> | |
926 | </row> | |
927 | <row> | |
928 | <entry align="center"> | |
929 | </entry> | |
930 | <entry align="center"> | |
931 | <inlineequation><mml:math> | |
932 | <!-- eqn: A sub v = :--> | |
933 | <mml:mrow> | |
934 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
935 | <mml:mi mathvariant="italic">v</mml:mi> | |
936 | </mml:msub> | |
937 | <mml:mo>=</mml:mo> | |
938 | </mml:mrow> | |
939 | </mml:math></inlineequation> | |
940 | </entry> | |
941 | <entry align="center"> | |
942 | <inlineequation><mml:math> | |
943 | <!-- eqn: A sub v = A sub s:--> | |
944 | <mml:mrow> | |
945 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
946 | <mml:mi mathvariant="italic">s</mml:mi> | |
947 | </mml:msub> | |
948 | </mml:mrow> | |
949 | </mml:math></inlineequation> | |
950 | </entry> | |
951 | <entry align="center"> | |
952 | <inlineequation><mml:math> | |
953 | <!-- eqn: A sub v = A sub p A sub s:--> | |
954 | <mml:mrow> | |
955 | <mml:mrow> | |
956 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
957 | <mml:mi mathvariant="italic">p</mml:mi> | |
958 | </mml:msub> | |
959 | <mml:mo>⁢</mml:mo> | |
960 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
961 | <mml:mi mathvariant="italic">s</mml:mi> | |
962 | </mml:msub> | |
963 | </mml:mrow> | |
964 | </mml:mrow> | |
965 | </mml:math></inlineequation> | |
966 | </entry> | |
967 | <entry align="center"> | |
968 | </entry> | |
969 | <entry align="center"> | |
970 | <inlineequation><mml:math> | |
971 | <!-- eqn: A sub v = A sub p ( 1 - A sub s ) + A sub c A sub s:--> | |
972 | <mml:mrow> | |
973 | <mml:mrow> | |
974 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
975 | <mml:mi mathvariant="italic">p</mml:mi> | |
976 | </mml:msub> | |
977 | <mml:mo>⁢</mml:mo> | |
978 | <mml:mfenced open="(" close=")"> | |
979 | <mml:mrow> | |
980 | <mml:mn>1</mml:mn> | |
981 | <mml:mo>-</mml:mo> | |
982 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
983 | <mml:mi mathvariant="italic">s</mml:mi> | |
984 | </mml:msub> | |
985 | </mml:mrow> | |
986 | </mml:mfenced> | |
987 | <mml:mo>+</mml:mo> | |
988 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
989 | <mml:mi mathvariant="italic">c</mml:mi> | |
990 | </mml:msub> | |
991 | <mml:mo>⁢</mml:mo> | |
992 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
993 | <mml:mi mathvariant="italic">s</mml:mi> | |
994 | </mml:msub> | |
995 | </mml:mrow> | |
996 | </mml:mrow> | |
997 | </mml:math></inlineequation> | |
998 | </entry> | |
999 | <entry align="center"> | |
1000 | <inlineequation><mml:math> | |
1001 | <!-- eqn: A sub v = A sub p + A sub s:--> | |
1002 | <mml:mrow> | |
1003 | <mml:mrow> | |
1004 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1005 | <mml:mi mathvariant="italic">p</mml:mi> | |
1006 | </mml:msub> | |
1007 | <mml:mo>+</mml:mo> | |
1008 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1009 | <mml:mi mathvariant="italic">s</mml:mi> | |
1010 | </mml:msub> | |
1011 | </mml:mrow> | |
1012 | </mml:mrow> | |
1013 | </mml:math></inlineequation> | |
1014 | </entry> | |
1015 | </row> | |
1016 | <row> | |
1017 | <entry align="center"> | |
1018 | <constant>GL_RGB</constant> | |
1019 | </entry> | |
1020 | <entry align="center"> | |
1021 | <inlineequation><mml:math> | |
1022 | <!-- eqn: C sub v = :--> | |
1023 | <mml:mrow> | |
1024 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1025 | <mml:mi mathvariant="italic">v</mml:mi> | |
1026 | </mml:msub> | |
1027 | <mml:mo>=</mml:mo> | |
1028 | </mml:mrow> | |
1029 | </mml:math></inlineequation> | |
1030 | </entry> | |
1031 | <entry align="center"> | |
1032 | <inlineequation><mml:math> | |
1033 | <!-- eqn: C sub v = C sub s:--> | |
1034 | <mml:mrow> | |
1035 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1036 | <mml:mi mathvariant="italic">s</mml:mi> | |
1037 | </mml:msub> | |
1038 | </mml:mrow> | |
1039 | </mml:math></inlineequation> | |
1040 | </entry> | |
1041 | <entry align="center"> | |
1042 | <inlineequation><mml:math> | |
1043 | <!-- eqn: C sub v = C sub p C sub s:--> | |
1044 | <mml:mrow> | |
1045 | <mml:mrow> | |
1046 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1047 | <mml:mi mathvariant="italic">p</mml:mi> | |
1048 | </mml:msub> | |
1049 | <mml:mo>⁢</mml:mo> | |
1050 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1051 | <mml:mi mathvariant="italic">s</mml:mi> | |
1052 | </mml:msub> | |
1053 | </mml:mrow> | |
1054 | </mml:mrow> | |
1055 | </mml:math></inlineequation> | |
1056 | </entry> | |
1057 | <entry align="center"> | |
1058 | <inlineequation><mml:math> | |
1059 | <!-- eqn: C sub v = C sub s:--> | |
1060 | <mml:mrow> | |
1061 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1062 | <mml:mi mathvariant="italic">s</mml:mi> | |
1063 | </mml:msub> | |
1064 | </mml:mrow> | |
1065 | </mml:math></inlineequation> | |
1066 | </entry> | |
1067 | <entry align="center"> | |
1068 | <inlineequation><mml:math> | |
1069 | <!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:--> | |
1070 | <mml:mrow> | |
1071 | <mml:mrow> | |
1072 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1073 | <mml:mi mathvariant="italic">p</mml:mi> | |
1074 | </mml:msub> | |
1075 | <mml:mo>⁢</mml:mo> | |
1076 | <mml:mfenced open="(" close=")"> | |
1077 | <mml:mrow> | |
1078 | <mml:mn>1</mml:mn> | |
1079 | <mml:mo>-</mml:mo> | |
1080 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1081 | <mml:mi mathvariant="italic">s</mml:mi> | |
1082 | </mml:msub> | |
1083 | </mml:mrow> | |
1084 | </mml:mfenced> | |
1085 | <mml:mo>+</mml:mo> | |
1086 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1087 | <mml:mi mathvariant="italic">c</mml:mi> | |
1088 | </mml:msub> | |
1089 | <mml:mo>⁢</mml:mo> | |
1090 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1091 | <mml:mi mathvariant="italic">s</mml:mi> | |
1092 | </mml:msub> | |
1093 | </mml:mrow> | |
1094 | </mml:mrow> | |
1095 | </mml:math></inlineequation> | |
1096 | </entry> | |
1097 | <entry align="center"> | |
1098 | <inlineequation><mml:math> | |
1099 | <!-- eqn: C sub v = C sub p + C sub s:--> | |
1100 | <mml:mrow> | |
1101 | <mml:mrow> | |
1102 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1103 | <mml:mi mathvariant="italic">p</mml:mi> | |
1104 | </mml:msub> | |
1105 | <mml:mo>+</mml:mo> | |
1106 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1107 | <mml:mi mathvariant="italic">s</mml:mi> | |
1108 | </mml:msub> | |
1109 | </mml:mrow> | |
1110 | </mml:mrow> | |
1111 | </mml:math></inlineequation> | |
1112 | </entry> | |
1113 | </row> | |
1114 | <row> | |
1115 | <entry align="center"> | |
1116 | (or 3) | |
1117 | </entry> | |
1118 | <entry align="center"> | |
1119 | <inlineequation><mml:math> | |
1120 | <!-- eqn: A sub v = :--> | |
1121 | <mml:mrow> | |
1122 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1123 | <mml:mi mathvariant="italic">v</mml:mi> | |
1124 | </mml:msub> | |
1125 | <mml:mo>=</mml:mo> | |
1126 | </mml:mrow> | |
1127 | </mml:math></inlineequation> | |
1128 | </entry> | |
1129 | <entry align="center"> | |
1130 | <inlineequation><mml:math> | |
1131 | <!-- eqn: A sub v = A sub p:--> | |
1132 | <mml:mrow> | |
1133 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1134 | <mml:mi mathvariant="italic">p</mml:mi> | |
1135 | </mml:msub> | |
1136 | </mml:mrow> | |
1137 | </mml:math></inlineequation> | |
1138 | </entry> | |
1139 | <entry align="center"> | |
1140 | <inlineequation><mml:math> | |
1141 | <!-- eqn: A sub v = A sub p:--> | |
1142 | <mml:mrow> | |
1143 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1144 | <mml:mi mathvariant="italic">p</mml:mi> | |
1145 | </mml:msub> | |
1146 | </mml:mrow> | |
1147 | </mml:math></inlineequation> | |
1148 | </entry> | |
1149 | <entry align="center"> | |
1150 | <inlineequation><mml:math> | |
1151 | <!-- eqn: A sub v = A sub p:--> | |
1152 | <mml:mrow> | |
1153 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1154 | <mml:mi mathvariant="italic">p</mml:mi> | |
1155 | </mml:msub> | |
1156 | </mml:mrow> | |
1157 | </mml:math></inlineequation> | |
1158 | </entry> | |
1159 | <entry align="center"> | |
1160 | <inlineequation><mml:math> | |
1161 | <!-- eqn: A sub v = A sub p:--> | |
1162 | <mml:mrow> | |
1163 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1164 | <mml:mi mathvariant="italic">p</mml:mi> | |
1165 | </mml:msub> | |
1166 | </mml:mrow> | |
1167 | </mml:math></inlineequation> | |
1168 | </entry> | |
1169 | <entry align="center"> | |
1170 | <inlineequation><mml:math> | |
1171 | <!-- eqn: A sub v = A sub p:--> | |
1172 | <mml:mrow> | |
1173 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1174 | <mml:mi mathvariant="italic">p</mml:mi> | |
1175 | </mml:msub> | |
1176 | </mml:mrow> | |
1177 | </mml:math></inlineequation> | |
1178 | </entry> | |
1179 | </row> | |
1180 | <row> | |
1181 | <entry align="center"> | |
1182 | <constant>GL_RGBA</constant> | |
1183 | </entry> | |
1184 | <entry align="center"> | |
1185 | <inlineequation><mml:math> | |
1186 | <!-- eqn: C sub v = :--> | |
1187 | <mml:mrow> | |
1188 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1189 | <mml:mi mathvariant="italic">v</mml:mi> | |
1190 | </mml:msub> | |
1191 | <mml:mo>=</mml:mo> | |
1192 | </mml:mrow> | |
1193 | </mml:math></inlineequation> | |
1194 | </entry> | |
1195 | <entry align="center"> | |
1196 | <inlineequation><mml:math> | |
1197 | <!-- eqn: C sub v = C sub s:--> | |
1198 | <mml:mrow> | |
1199 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1200 | <mml:mi mathvariant="italic">s</mml:mi> | |
1201 | </mml:msub> | |
1202 | </mml:mrow> | |
1203 | </mml:math></inlineequation> | |
1204 | </entry> | |
1205 | <entry align="center"> | |
1206 | <inlineequation><mml:math> | |
1207 | <!-- eqn: C sub v = C sub p C sub s:--> | |
1208 | <mml:mrow> | |
1209 | <mml:mrow> | |
1210 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1211 | <mml:mi mathvariant="italic">p</mml:mi> | |
1212 | </mml:msub> | |
1213 | <mml:mo>⁢</mml:mo> | |
1214 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1215 | <mml:mi mathvariant="italic">s</mml:mi> | |
1216 | </mml:msub> | |
1217 | </mml:mrow> | |
1218 | </mml:mrow> | |
1219 | </mml:math></inlineequation> | |
1220 | </entry> | |
1221 | <entry align="center"> | |
1222 | <inlineequation><mml:math> | |
1223 | <!-- eqn: C sub v = C sub p ( 1 - A sub s ) + C sub s A sub s:--> | |
1224 | <mml:mrow> | |
1225 | <mml:mrow> | |
1226 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1227 | <mml:mi mathvariant="italic">p</mml:mi> | |
1228 | </mml:msub> | |
1229 | <mml:mo>⁢</mml:mo> | |
1230 | <mml:mfenced open="(" close=")"> | |
1231 | <mml:mrow> | |
1232 | <mml:mn>1</mml:mn> | |
1233 | <mml:mo>-</mml:mo> | |
1234 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1235 | <mml:mi mathvariant="italic">s</mml:mi> | |
1236 | </mml:msub> | |
1237 | </mml:mrow> | |
1238 | </mml:mfenced> | |
1239 | <mml:mo>+</mml:mo> | |
1240 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1241 | <mml:mi mathvariant="italic">s</mml:mi> | |
1242 | </mml:msub> | |
1243 | <mml:mo>⁢</mml:mo> | |
1244 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1245 | <mml:mi mathvariant="italic">s</mml:mi> | |
1246 | </mml:msub> | |
1247 | </mml:mrow> | |
1248 | </mml:mrow> | |
1249 | </mml:math></inlineequation> | |
1250 | </entry> | |
1251 | <entry align="center"> | |
1252 | <inlineequation><mml:math> | |
1253 | <!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:--> | |
1254 | <mml:mrow> | |
1255 | <mml:mrow> | |
1256 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1257 | <mml:mi mathvariant="italic">p</mml:mi> | |
1258 | </mml:msub> | |
1259 | <mml:mo>⁢</mml:mo> | |
1260 | <mml:mfenced open="(" close=")"> | |
1261 | <mml:mrow> | |
1262 | <mml:mn>1</mml:mn> | |
1263 | <mml:mo>-</mml:mo> | |
1264 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1265 | <mml:mi mathvariant="italic">s</mml:mi> | |
1266 | </mml:msub> | |
1267 | </mml:mrow> | |
1268 | </mml:mfenced> | |
1269 | <mml:mo>+</mml:mo> | |
1270 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1271 | <mml:mi mathvariant="italic">c</mml:mi> | |
1272 | </mml:msub> | |
1273 | <mml:mo>⁢</mml:mo> | |
1274 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1275 | <mml:mi mathvariant="italic">s</mml:mi> | |
1276 | </mml:msub> | |
1277 | </mml:mrow> | |
1278 | </mml:mrow> | |
1279 | </mml:math></inlineequation> | |
1280 | </entry> | |
1281 | <entry align="center"> | |
1282 | <inlineequation><mml:math> | |
1283 | <!-- eqn: C sub v = C sub p + C sub s:--> | |
1284 | <mml:mrow> | |
1285 | <mml:mrow> | |
1286 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1287 | <mml:mi mathvariant="italic">p</mml:mi> | |
1288 | </mml:msub> | |
1289 | <mml:mo>+</mml:mo> | |
1290 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1291 | <mml:mi mathvariant="italic">s</mml:mi> | |
1292 | </mml:msub> | |
1293 | </mml:mrow> | |
1294 | </mml:mrow> | |
1295 | </mml:math></inlineequation> | |
1296 | </entry> | |
1297 | </row> | |
1298 | <row> | |
1299 | <entry align="center"> | |
1300 | (or 4) | |
1301 | </entry> | |
1302 | <entry align="center"> | |
1303 | <inlineequation><mml:math> | |
1304 | <!-- eqn: A sub v = :--> | |
1305 | <mml:mrow> | |
1306 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1307 | <mml:mi mathvariant="italic">v</mml:mi> | |
1308 | </mml:msub> | |
1309 | <mml:mo>=</mml:mo> | |
1310 | </mml:mrow> | |
1311 | </mml:math></inlineequation> | |
1312 | </entry> | |
1313 | <entry align="center"> | |
1314 | <inlineequation><mml:math> | |
1315 | <!-- eqn: A sub v = A sub s:--> | |
1316 | <mml:mrow> | |
1317 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1318 | <mml:mi mathvariant="italic">s</mml:mi> | |
1319 | </mml:msub> | |
1320 | </mml:mrow> | |
1321 | </mml:math></inlineequation> | |
1322 | </entry> | |
1323 | <entry align="center"> | |
1324 | <inlineequation><mml:math> | |
1325 | <!-- eqn: A sub v = A sub p A sub s:--> | |
1326 | <mml:mrow> | |
1327 | <mml:mrow> | |
1328 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1329 | <mml:mi mathvariant="italic">p</mml:mi> | |
1330 | </mml:msub> | |
1331 | <mml:mo>⁢</mml:mo> | |
1332 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1333 | <mml:mi mathvariant="italic">s</mml:mi> | |
1334 | </mml:msub> | |
1335 | </mml:mrow> | |
1336 | </mml:mrow> | |
1337 | </mml:math></inlineequation> | |
1338 | </entry> | |
1339 | <entry align="center"> | |
1340 | <inlineequation><mml:math> | |
1341 | <!-- eqn: A sub v = A sub p:--> | |
1342 | <mml:mrow> | |
1343 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1344 | <mml:mi mathvariant="italic">p</mml:mi> | |
1345 | </mml:msub> | |
1346 | </mml:mrow> | |
1347 | </mml:math></inlineequation> | |
1348 | </entry> | |
1349 | <entry align="center"> | |
1350 | <inlineequation><mml:math> | |
1351 | <!-- eqn: A sub v = A sub p A sub s:--> | |
1352 | <mml:mrow> | |
1353 | <mml:mrow> | |
1354 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1355 | <mml:mi mathvariant="italic">p</mml:mi> | |
1356 | </mml:msub> | |
1357 | <mml:mo>⁢</mml:mo> | |
1358 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1359 | <mml:mi mathvariant="italic">s</mml:mi> | |
1360 | </mml:msub> | |
1361 | </mml:mrow> | |
1362 | </mml:mrow> | |
1363 | </mml:math></inlineequation> | |
1364 | </entry> | |
1365 | <entry align="center"> | |
1366 | <inlineequation><mml:math> | |
1367 | <!-- eqn: A sub v = A sub p A sub s:--> | |
1368 | <mml:mrow> | |
1369 | <mml:mrow> | |
1370 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1371 | <mml:mi mathvariant="italic">p</mml:mi> | |
1372 | </mml:msub> | |
1373 | <mml:mo>⁢</mml:mo> | |
1374 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1375 | <mml:mi mathvariant="italic">s</mml:mi> | |
1376 | </mml:msub> | |
1377 | </mml:mrow> | |
1378 | </mml:mrow> | |
1379 | </mml:math></inlineequation> | |
1380 | </entry> | |
1381 | </row> | |
1382 | </tbody> | |
1383 | </tgroup> | |
1384 | </informaltable> | |
1385 | <para> | |
1386 | If <parameter>pname</parameter> is <constant>GL_TEXTURE_ENV_MODE</constant>, and <parameter>params</parameter> is <constant>GL_COMBINE</constant>, the | |
1387 | form of the texture function depends on the values of <constant>GL_COMBINE_RGB</constant> | |
1388 | and <constant>GL_COMBINE_ALPHA</constant>. | |
1389 | </para> | |
1390 | <para> | |
1391 | The following describes how the texture sources, as specified by | |
1392 | <constant>GL_SRC0_RGB</constant>, <constant>GL_SRC1_RGB</constant>, <constant>GL_SRC2_RGB</constant>, | |
1393 | <constant>GL_SRC0_ALPHA</constant>, <constant>GL_SRC1_ALPHA</constant>, and <constant>GL_SRC2_ALPHA</constant>, | |
1394 | are combined to produce a final texture color. In the following tables, | |
1395 | <constant>GL_SRC0_c</constant> is represented by | |
1396 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation>, | |
1397 | <constant>GL_SRC1_c</constant> is | |
1398 | represented by | |
1399 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg1</mml:mi></mml:math></inlineequation>, | |
1400 | and <constant>GL_SRC2_c</constant> is represented by | |
1401 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg2</mml:mi></mml:math></inlineequation>. | |
1402 | </para> | |
1403 | <para> | |
1404 | <constant>GL_COMBINE_RGB</constant> accepts any of <constant>GL_REPLACE</constant>, <constant>GL_MODULATE</constant>, | |
1405 | <constant>GL_ADD</constant>, <constant>GL_ADD_SIGNED</constant>, <constant>GL_INTERPOLATE</constant>, <constant>GL_SUBTRACT</constant>, | |
1406 | <constant>GL_DOT3_RGB</constant>, or <constant>GL_DOT3_RGBA</constant>. | |
1407 | </para> | |
1408 | <para> | |
1409 | </para> | |
1410 | <informaltable frame="topbot"> | |
1411 | <tgroup cols="2" align="left"> | |
1412 | <colspec/> | |
1413 | <colspec/> | |
1414 | <thead> | |
1415 | <row> | |
1416 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
1417 | <constant>GL_COMBINE_RGB</constant> | |
1418 | </emphasis></entry> | |
1419 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
1420 | Texture Function | |
1421 | </emphasis></entry> | |
1422 | </row> | |
1423 | </thead> | |
1424 | <tbody> | |
1425 | <row> | |
1426 | <entry align="left"> | |
1427 | <constant>GL_REPLACE</constant> | |
1428 | </entry> | |
1429 | <entry align="left"> | |
1430 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation> | |
1431 | </entry> | |
1432 | </row> | |
1433 | <row> | |
1434 | <entry align="left"> | |
1435 | <constant>GL_MODULATE</constant> | |
1436 | </entry> | |
1437 | <entry align="left"> | |
1438 | <inlineequation><mml:math> | |
1439 | <!-- eqn: Arg0 * Arg1:--> | |
1440 | <mml:mrow> | |
1441 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1442 | <mml:mo>×</mml:mo> | |
1443 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1444 | </mml:mrow> | |
1445 | </mml:math></inlineequation> | |
1446 | </entry> | |
1447 | </row> | |
1448 | <row> | |
1449 | <entry align="left"> | |
1450 | <constant>GL_ADD</constant> | |
1451 | </entry> | |
1452 | <entry align="left"> | |
1453 | <inlineequation><mml:math> | |
1454 | <!-- eqn: Arg0 + Arg1:--> | |
1455 | <mml:mrow> | |
1456 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1457 | <mml:mo>+</mml:mo> | |
1458 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1459 | </mml:mrow> | |
1460 | </mml:math></inlineequation> | |
1461 | </entry> | |
1462 | </row> | |
1463 | <row> | |
1464 | <entry align="left"> | |
1465 | <constant>GL_ADD_SIGNED</constant> | |
1466 | </entry> | |
1467 | <entry align="left"> | |
1468 | <inlineequation><mml:math> | |
1469 | <!-- eqn: Arg0 + Arg1 - 0.5:--> | |
1470 | <mml:mrow> | |
1471 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1472 | <mml:mo>+</mml:mo> | |
1473 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1474 | <mml:mo>-</mml:mo> | |
1475 | <mml:mn>0.5</mml:mn> | |
1476 | </mml:mrow> | |
1477 | </mml:math></inlineequation> | |
1478 | </entry> | |
1479 | </row> | |
1480 | <row> | |
1481 | <entry align="left"> | |
1482 | <constant>GL_INTERPOLATE</constant> | |
1483 | </entry> | |
1484 | <entry align="left"> | |
1485 | <inlineequation><mml:math> | |
1486 | <!-- eqn: Arg0 * Arg2 + Arg1*(1 - Arg2):--> | |
1487 | <mml:mrow> | |
1488 | <mml:mrow> | |
1489 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1490 | <mml:mo>×</mml:mo> | |
1491 | <mml:mi mathvariant="italic">Arg2</mml:mi> | |
1492 | </mml:mrow> | |
1493 | <mml:mo>+</mml:mo> | |
1494 | <mml:mrow> | |
1495 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1496 | <mml:mo>×</mml:mo> | |
1497 | <mml:mfenced open="(" close=")"> | |
1498 | <mml:mrow> | |
1499 | <mml:mn>1</mml:mn> | |
1500 | <mml:mo>-</mml:mo> | |
1501 | <mml:mi mathvariant="italic">Arg2</mml:mi> | |
1502 | </mml:mrow> | |
1503 | </mml:mfenced> | |
1504 | </mml:mrow> | |
1505 | </mml:mrow> | |
1506 | </mml:math></inlineequation> | |
1507 | </entry> | |
1508 | </row> | |
1509 | <row> | |
1510 | <entry align="left"> | |
1511 | <constant>GL_SUBTRACT</constant> | |
1512 | </entry> | |
1513 | <entry align="left"> | |
1514 | <inlineequation><mml:math> | |
1515 | <!-- eqn: Arg0 - Arg1:--> | |
1516 | <mml:mrow> | |
1517 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1518 | <mml:mo>-</mml:mo> | |
1519 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1520 | </mml:mrow> | |
1521 | </mml:math></inlineequation> | |
1522 | </entry> | |
1523 | </row> | |
1524 | <row> | |
1525 | <entry align="left"> | |
1526 | <constant>GL_DOT3_RGB</constant> | |
1527 | or | |
1528 | <constant>GL_DOT3_RGBA</constant> | |
1529 | </entry> | |
1530 | <entry align="left"> | |
1531 | <!-- eqn: 4 * ((({Arg0 sub r} - 0.5) * ({Arg1 sub r} - 0.5)) + | |
1532 | (({Arg0 sub g} - 0.5) * ({Arg1 sub g} - 0.5)) + | |
1533 | (({Arg0 sub b} - 0.5) * ({Arg1 sub b} - 0.5)):--> | |
1534 | <inlineequation><mml:math> | |
1535 | <mml:mrow> | |
1536 | <mml:mn>4</mml:mn> | |
1537 | <mml:mo>×</mml:mo> | |
1538 | <mml:mfenced open="(" close=")"> | |
1539 | <mml:mrow> | |
1540 | <mml:mfenced open="(" close=")"> | |
1541 | <mml:mrow> | |
1542 | <mml:mfenced open="(" close=")"> | |
1543 | <mml:mrow> | |
1544 | <mml:mfenced open="" close=""> | |
1545 | <mml:msub><mml:mi mathvariant="italic">Arg0</mml:mi> | |
1546 | <mml:mi mathvariant="italic">r</mml:mi> | |
1547 | </mml:msub> | |
1548 | </mml:mfenced> | |
1549 | <mml:mo>-</mml:mo> | |
1550 | <mml:mn>0.5</mml:mn> | |
1551 | </mml:mrow> | |
1552 | </mml:mfenced> | |
1553 | <mml:mo>×</mml:mo> | |
1554 | <mml:mfenced open="(" close=")"> | |
1555 | <mml:mrow> | |
1556 | <mml:mfenced open="" close=""> | |
1557 | <mml:msub><mml:mi mathvariant="italic">Arg1</mml:mi> | |
1558 | <mml:mi mathvariant="italic">r</mml:mi> | |
1559 | </mml:msub> | |
1560 | </mml:mfenced> | |
1561 | <mml:mo>-</mml:mo> | |
1562 | <mml:mn>0.5</mml:mn> | |
1563 | </mml:mrow> | |
1564 | </mml:mfenced> | |
1565 | </mml:mrow> | |
1566 | </mml:mfenced> | |
1567 | <mml:mo>+</mml:mo> | |
1568 | <mml:mfenced open="(" close=")"> | |
1569 | <mml:mrow> | |
1570 | <mml:mfenced open="(" close=")"> | |
1571 | <mml:mrow> | |
1572 | <mml:mfenced open="" close=""> | |
1573 | <mml:msub><mml:mi mathvariant="italic">Arg0</mml:mi> | |
1574 | <mml:mi mathvariant="italic">g</mml:mi> | |
1575 | </mml:msub> | |
1576 | </mml:mfenced> | |
1577 | <mml:mo>-</mml:mo> | |
1578 | <mml:mn>0.5</mml:mn> | |
1579 | </mml:mrow> | |
1580 | </mml:mfenced> | |
1581 | <mml:mo>×</mml:mo> | |
1582 | <mml:mfenced open="(" close=")"> | |
1583 | <mml:mrow> | |
1584 | <mml:mfenced open="" close=""> | |
1585 | <mml:msub><mml:mi mathvariant="italic">Arg1</mml:mi> | |
1586 | <mml:mi mathvariant="italic">g</mml:mi> | |
1587 | </mml:msub> | |
1588 | </mml:mfenced> | |
1589 | <mml:mo>-</mml:mo> | |
1590 | <mml:mn>0.5</mml:mn> | |
1591 | </mml:mrow> | |
1592 | </mml:mfenced> | |
1593 | </mml:mrow> | |
1594 | </mml:mfenced> | |
1595 | <mml:mo>+</mml:mo> | |
1596 | <mml:mfenced open="(" close=")"> | |
1597 | <mml:mrow> | |
1598 | <mml:mfenced open="(" close=")"> | |
1599 | <mml:mrow> | |
1600 | <mml:mfenced open="" close=""> | |
1601 | <mml:msub><mml:mi mathvariant="italic">Arg0</mml:mi> | |
1602 | <mml:mi mathvariant="italic">b</mml:mi> | |
1603 | </mml:msub> | |
1604 | </mml:mfenced> | |
1605 | <mml:mo>-</mml:mo> | |
1606 | <mml:mn>0.5</mml:mn> | |
1607 | </mml:mrow> | |
1608 | </mml:mfenced> | |
1609 | <mml:mo>×</mml:mo> | |
1610 | <mml:mfenced open="(" close=")"> | |
1611 | <mml:mrow> | |
1612 | <mml:mfenced open="" close=""> | |
1613 | <mml:msub><mml:mi mathvariant="italic">Arg1</mml:mi> | |
1614 | <mml:mi mathvariant="italic">b</mml:mi> | |
1615 | </mml:msub> | |
1616 | </mml:mfenced> | |
1617 | <mml:mo>-</mml:mo> | |
1618 | <mml:mn>0.5</mml:mn> | |
1619 | </mml:mrow> | |
1620 | </mml:mfenced> | |
1621 | </mml:mrow> | |
1622 | </mml:mfenced> | |
1623 | </mml:mrow> | |
1624 | </mml:mfenced> | |
1625 | </mml:mrow> | |
1626 | </mml:math></inlineequation> | |
1627 | </entry> | |
1628 | </row> | |
1629 | </tbody> | |
1630 | </tgroup> | |
1631 | </informaltable> | |
1632 | <para> | |
1633 | The scalar results for <constant>GL_DOT3_RGB</constant> and <constant>GL_DOT3_RGBA</constant> are placed | |
1634 | into each of the 3 (RGB) or 4 (RGBA) components on output. | |
1635 | </para> | |
1636 | <para> | |
1637 | Likewise, <constant>GL_COMBINE_ALPHA</constant> accepts any of <constant>GL_REPLACE</constant>, | |
1638 | <constant>GL_MODULATE</constant>, <constant>GL_ADD</constant>, <constant>GL_ADD_SIGNED</constant>, <constant>GL_INTERPOLATE</constant>, or | |
1639 | <constant>GL_SUBTRACT</constant>. The following table describes how alpha values are | |
1640 | combined: | |
1641 | </para> | |
1642 | <para> | |
1643 | </para> | |
1644 | <informaltable frame="topbot"> | |
1645 | <tgroup cols="2" align="left"> | |
1646 | <colspec/> | |
1647 | <colspec/> | |
1648 | <thead> | |
1649 | <row> | |
1650 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
1651 | <constant>GL_COMBINE_ALPHA</constant> | |
1652 | </emphasis></entry> | |
1653 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
1654 | Texture Function | |
1655 | </emphasis></entry> | |
1656 | </row> | |
1657 | </thead> | |
1658 | <tbody> | |
1659 | <row> | |
1660 | <entry align="left"> | |
1661 | <constant>GL_REPLACE</constant> | |
1662 | </entry> | |
1663 | <entry align="left"> | |
1664 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation> | |
1665 | </entry> | |
1666 | </row> | |
1667 | <row> | |
1668 | <entry align="left"> | |
1669 | <constant>GL_MODULATE</constant> | |
1670 | </entry> | |
1671 | <entry align="left"> | |
1672 | <inlineequation><mml:math> | |
1673 | <!-- eqn: Arg0 * Arg1:--> | |
1674 | <mml:mrow> | |
1675 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1676 | <mml:mo>×</mml:mo> | |
1677 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1678 | </mml:mrow> | |
1679 | </mml:math></inlineequation> | |
1680 | </entry> | |
1681 | </row> | |
1682 | <row> | |
1683 | <entry align="left"> | |
1684 | <constant>GL_ADD</constant> | |
1685 | </entry> | |
1686 | <entry align="left"> | |
1687 | <inlineequation><mml:math> | |
1688 | <!-- eqn: Arg0 + Arg1:--> | |
1689 | <mml:mrow> | |
1690 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1691 | <mml:mo>+</mml:mo> | |
1692 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1693 | </mml:mrow> | |
1694 | </mml:math></inlineequation> | |
1695 | </entry> | |
1696 | </row> | |
1697 | <row> | |
1698 | <entry align="left"> | |
1699 | <constant>GL_ADD_SIGNED</constant> | |
1700 | </entry> | |
1701 | <entry align="left"> | |
1702 | <inlineequation><mml:math> | |
1703 | <!-- eqn: Arg0 + Arg1 - 0.5:--> | |
1704 | <mml:mrow> | |
1705 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1706 | <mml:mo>+</mml:mo> | |
1707 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1708 | <mml:mo>-</mml:mo> | |
1709 | <mml:mn>0.5</mml:mn> | |
1710 | </mml:mrow> | |
1711 | </mml:math></inlineequation> | |
1712 | </entry> | |
1713 | </row> | |
1714 | <row> | |
1715 | <entry align="left"> | |
1716 | <constant>GL_INTERPOLATE</constant> | |
1717 | </entry> | |
1718 | <entry align="left"> | |
1719 | <inlineequation><mml:math> | |
1720 | <!-- eqn: Arg0 * Arg2 + Arg1*(1 - Arg2):--> | |
1721 | <mml:mrow> | |
1722 | <mml:mrow> | |
1723 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1724 | <mml:mo>×</mml:mo> | |
1725 | <mml:mi mathvariant="italic">Arg2</mml:mi> | |
1726 | </mml:mrow> | |
1727 | <mml:mo>+</mml:mo> | |
1728 | <mml:mrow> | |
1729 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1730 | <mml:mo>×</mml:mo> | |
1731 | <mml:mfenced open="(" close=")"> | |
1732 | <mml:mrow> | |
1733 | <mml:mn>1</mml:mn> | |
1734 | <mml:mo>-</mml:mo> | |
1735 | <mml:mi mathvariant="italic">Arg2</mml:mi> | |
1736 | </mml:mrow> | |
1737 | </mml:mfenced> | |
1738 | </mml:mrow> | |
1739 | </mml:mrow> | |
1740 | </mml:math></inlineequation> | |
1741 | </entry> | |
1742 | </row> | |
1743 | <row> | |
1744 | <entry align="left"> | |
1745 | <constant>GL_SUBTRACT</constant> | |
1746 | </entry> | |
1747 | <entry align="left"> | |
1748 | <inlineequation><mml:math> | |
1749 | <!-- eqn: Arg0 - Arg1:--> | |
1750 | <mml:mrow> | |
1751 | <mml:mi mathvariant="italic">Arg0</mml:mi> | |
1752 | <mml:mo>-</mml:mo> | |
1753 | <mml:mi mathvariant="italic">Arg1</mml:mi> | |
1754 | </mml:mrow> | |
1755 | </mml:math></inlineequation> | |
1756 | </entry> | |
1757 | </row> | |
1758 | </tbody> | |
1759 | </tgroup> | |
1760 | </informaltable> | |
1761 | <para> | |
1762 | In the following tables, the value | |
1763 | <inlineequation><mml:math> | |
1764 | <!-- eqn: C sub s:--> | |
1765 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1766 | <mml:mi mathvariant="italic">s</mml:mi> | |
1767 | </mml:msub> | |
1768 | </mml:math></inlineequation> | |
1769 | represents the color sampled | |
1770 | from the currently bound texture, | |
1771 | <inlineequation><mml:math> | |
1772 | <!-- eqn: C sub c:--> | |
1773 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1774 | <mml:mi mathvariant="italic">c</mml:mi> | |
1775 | </mml:msub> | |
1776 | </mml:math></inlineequation> | |
1777 | represents the constant | |
1778 | texture-environment color, | |
1779 | <inlineequation><mml:math> | |
1780 | <!-- eqn: C sub f:--> | |
1781 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1782 | <mml:mi mathvariant="italic">f</mml:mi> | |
1783 | </mml:msub> | |
1784 | </mml:math></inlineequation> | |
1785 | represents the primary color of the | |
1786 | incoming fragment, and | |
1787 | <inlineequation><mml:math> | |
1788 | <!-- eqn: C sub p:--> | |
1789 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1790 | <mml:mi mathvariant="italic">p</mml:mi> | |
1791 | </mml:msub> | |
1792 | </mml:math></inlineequation> | |
1793 | represents the color computed from the | |
1794 | previous texture stage or | |
1795 | <inlineequation><mml:math> | |
1796 | <!-- eqn: C sub f:--> | |
1797 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1798 | <mml:mi mathvariant="italic">f</mml:mi> | |
1799 | </mml:msub> | |
1800 | </mml:math></inlineequation> | |
1801 | if processing texture stage 0. Likewise, | |
1802 | <inlineequation><mml:math> | |
1803 | <!-- eqn: A sub s:--> | |
1804 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1805 | <mml:mi mathvariant="italic">s</mml:mi> | |
1806 | </mml:msub> | |
1807 | </mml:math></inlineequation>, | |
1808 | <inlineequation><mml:math> | |
1809 | <!-- eqn: A sub c:--> | |
1810 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1811 | <mml:mi mathvariant="italic">c</mml:mi> | |
1812 | </mml:msub> | |
1813 | </mml:math></inlineequation>, | |
1814 | <inlineequation><mml:math> | |
1815 | <!-- eqn: A sub f:--> | |
1816 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1817 | <mml:mi mathvariant="italic">f</mml:mi> | |
1818 | </mml:msub> | |
1819 | </mml:math></inlineequation>, | |
1820 | and | |
1821 | <inlineequation><mml:math> | |
1822 | <!-- eqn: A sub p:--> | |
1823 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1824 | <mml:mi mathvariant="italic">p</mml:mi> | |
1825 | </mml:msub> | |
1826 | </mml:math></inlineequation> | |
1827 | represent the respective | |
1828 | alpha values. | |
1829 | </para> | |
1830 | <para> | |
1831 | The following table describes the values assigned to | |
1832 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation>, | |
1833 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg1</mml:mi></mml:math></inlineequation>, | |
1834 | and | |
1835 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg2</mml:mi></mml:math></inlineequation> | |
1836 | based upon the RGB sources and operands: | |
1837 | </para> | |
1838 | <para> | |
1839 | </para> | |
1840 | <informaltable frame="topbot"> | |
1841 | <tgroup cols="3" align="left"> | |
1842 | <colspec/> | |
1843 | <colspec/> | |
1844 | <colspec align="center"/> | |
1845 | <thead> | |
1846 | <row> | |
1847 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
1848 | <constant>GL_SRCn_RGB</constant> | |
1849 | </emphasis></entry> | |
1850 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
1851 | <constant>GL_OPERANDn_RGB</constant> | |
1852 | </emphasis></entry> | |
1853 | <entry rowsep="1" align="center"><emphasis role="bold"> | |
1854 | Argument Value | |
1855 | </emphasis></entry> | |
1856 | </row> | |
1857 | </thead> | |
1858 | <tbody> | |
1859 | <row> | |
1860 | <entry align="left"> | |
1861 | <constant>GL_TEXTURE</constant> | |
1862 | </entry> | |
1863 | <entry align="left"> | |
1864 | <constant>GL_SRC_COLOR</constant> | |
1865 | </entry> | |
1866 | <entry align="center"> | |
1867 | <inlineequation><mml:math> | |
1868 | <!-- eqn: {C sub s}:--> | |
1869 | <mml:mfenced open="" close=""> | |
1870 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1871 | <mml:mi mathvariant="italic">s</mml:mi> | |
1872 | </mml:msub> | |
1873 | </mml:mfenced> | |
1874 | </mml:math></inlineequation> | |
1875 | </entry> | |
1876 | </row> | |
1877 | <row> | |
1878 | <entry align="left"> | |
1879 | </entry> | |
1880 | <entry align="left"> | |
1881 | <constant>GL_ONE_MINUS_SRC_COLOR</constant> | |
1882 | </entry> | |
1883 | <entry align="center"> | |
1884 | <inlineequation><mml:math> | |
1885 | <!-- eqn: 1 - {C sub s}:--> | |
1886 | <mml:mrow> | |
1887 | <mml:mn>1</mml:mn> | |
1888 | <mml:mo>-</mml:mo> | |
1889 | <mml:mfenced open="" close=""> | |
1890 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1891 | <mml:mi mathvariant="italic">s</mml:mi> | |
1892 | </mml:msub> | |
1893 | </mml:mfenced> | |
1894 | </mml:mrow> | |
1895 | </mml:math></inlineequation> | |
1896 | </entry> | |
1897 | </row> | |
1898 | <row> | |
1899 | <entry align="left"> | |
1900 | </entry> | |
1901 | <entry align="left"> | |
1902 | <constant>GL_SRC_ALPHA</constant> | |
1903 | </entry> | |
1904 | <entry align="center"> | |
1905 | <inlineequation><mml:math> | |
1906 | <!-- eqn: {A sub s}:--> | |
1907 | <mml:mfenced open="" close=""> | |
1908 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1909 | <mml:mi mathvariant="italic">s</mml:mi> | |
1910 | </mml:msub> | |
1911 | </mml:mfenced> | |
1912 | </mml:math></inlineequation> | |
1913 | </entry> | |
1914 | </row> | |
1915 | <row> | |
1916 | <entry align="left"> | |
1917 | </entry> | |
1918 | <entry align="left"> | |
1919 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
1920 | </entry> | |
1921 | <entry align="center"> | |
1922 | <inlineequation><mml:math> | |
1923 | <!-- eqn: 1 - {A sub s}:--> | |
1924 | <mml:mrow> | |
1925 | <mml:mn>1</mml:mn> | |
1926 | <mml:mo>-</mml:mo> | |
1927 | <mml:mfenced open="" close=""> | |
1928 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1929 | <mml:mi mathvariant="italic">s</mml:mi> | |
1930 | </mml:msub> | |
1931 | </mml:mfenced> | |
1932 | </mml:mrow> | |
1933 | </mml:math></inlineequation> | |
1934 | </entry> | |
1935 | </row> | |
1936 | <row> | |
1937 | <entry align="left"> | |
1938 | <constant>GL_TEXTUREn</constant> | |
1939 | </entry> | |
1940 | <entry align="left"> | |
1941 | <constant>GL_SRC_COLOR</constant> | |
1942 | </entry> | |
1943 | <entry align="center"> | |
1944 | <inlineequation><mml:math> | |
1945 | <!-- eqn: {C sub s}:--> | |
1946 | <mml:mfenced open="" close=""> | |
1947 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1948 | <mml:mi mathvariant="italic">s</mml:mi> | |
1949 | </mml:msub> | |
1950 | </mml:mfenced> | |
1951 | </mml:math></inlineequation> | |
1952 | </entry> | |
1953 | </row> | |
1954 | <row> | |
1955 | <entry align="left"> | |
1956 | </entry> | |
1957 | <entry align="left"> | |
1958 | <constant>GL_ONE_MINUS_SRC_COLOR</constant> | |
1959 | </entry> | |
1960 | <entry align="center"> | |
1961 | <inlineequation><mml:math> | |
1962 | <!-- eqn: 1 - {C sub s}:--> | |
1963 | <mml:mrow> | |
1964 | <mml:mn>1</mml:mn> | |
1965 | <mml:mo>-</mml:mo> | |
1966 | <mml:mfenced open="" close=""> | |
1967 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
1968 | <mml:mi mathvariant="italic">s</mml:mi> | |
1969 | </mml:msub> | |
1970 | </mml:mfenced> | |
1971 | </mml:mrow> | |
1972 | </mml:math></inlineequation> | |
1973 | </entry> | |
1974 | </row> | |
1975 | <row> | |
1976 | <entry align="left"> | |
1977 | </entry> | |
1978 | <entry align="left"> | |
1979 | <constant>GL_SRC_ALPHA</constant> | |
1980 | </entry> | |
1981 | <entry align="center"> | |
1982 | <inlineequation><mml:math> | |
1983 | <!-- eqn: {A sub s}:--> | |
1984 | <mml:mfenced open="" close=""> | |
1985 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
1986 | <mml:mi mathvariant="italic">s</mml:mi> | |
1987 | </mml:msub> | |
1988 | </mml:mfenced> | |
1989 | </mml:math></inlineequation> | |
1990 | </entry> | |
1991 | </row> | |
1992 | <row> | |
1993 | <entry align="left"> | |
1994 | </entry> | |
1995 | <entry align="left"> | |
1996 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
1997 | </entry> | |
1998 | <entry align="center"> | |
1999 | <inlineequation><mml:math> | |
2000 | <!-- eqn: 1 - {A sub s}:--> | |
2001 | <mml:mrow> | |
2002 | <mml:mn>1</mml:mn> | |
2003 | <mml:mo>-</mml:mo> | |
2004 | <mml:mfenced open="" close=""> | |
2005 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2006 | <mml:mi mathvariant="italic">s</mml:mi> | |
2007 | </mml:msub> | |
2008 | </mml:mfenced> | |
2009 | </mml:mrow> | |
2010 | </mml:math></inlineequation> | |
2011 | </entry> | |
2012 | </row> | |
2013 | <row> | |
2014 | <entry align="left"> | |
2015 | <constant>GL_CONSTANT</constant> | |
2016 | </entry> | |
2017 | <entry align="left"> | |
2018 | <constant>GL_SRC_COLOR</constant> | |
2019 | </entry> | |
2020 | <entry align="center"> | |
2021 | <inlineequation><mml:math> | |
2022 | <!-- eqn: {C sub c}:--> | |
2023 | <mml:mfenced open="" close=""> | |
2024 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
2025 | <mml:mi mathvariant="italic">c</mml:mi> | |
2026 | </mml:msub> | |
2027 | </mml:mfenced> | |
2028 | </mml:math></inlineequation> | |
2029 | </entry> | |
2030 | </row> | |
2031 | <row> | |
2032 | <entry align="left"> | |
2033 | </entry> | |
2034 | <entry align="left"> | |
2035 | <constant>GL_ONE_MINUS_SRC_COLOR</constant> | |
2036 | </entry> | |
2037 | <entry align="center"> | |
2038 | <inlineequation><mml:math> | |
2039 | <!-- eqn: 1 - {C sub c}:--> | |
2040 | <mml:mrow> | |
2041 | <mml:mn>1</mml:mn> | |
2042 | <mml:mo>-</mml:mo> | |
2043 | <mml:mfenced open="" close=""> | |
2044 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
2045 | <mml:mi mathvariant="italic">c</mml:mi> | |
2046 | </mml:msub> | |
2047 | </mml:mfenced> | |
2048 | </mml:mrow> | |
2049 | </mml:math></inlineequation> | |
2050 | </entry> | |
2051 | </row> | |
2052 | <row> | |
2053 | <entry align="left"> | |
2054 | </entry> | |
2055 | <entry align="left"> | |
2056 | <constant>GL_SRC_ALPHA</constant> | |
2057 | </entry> | |
2058 | <entry align="center"> | |
2059 | <inlineequation><mml:math> | |
2060 | <!-- eqn: {A sub c}:--> | |
2061 | <mml:mfenced open="" close=""> | |
2062 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2063 | <mml:mi mathvariant="italic">c</mml:mi> | |
2064 | </mml:msub> | |
2065 | </mml:mfenced> | |
2066 | </mml:math></inlineequation> | |
2067 | </entry> | |
2068 | </row> | |
2069 | <row> | |
2070 | <entry align="left"> | |
2071 | </entry> | |
2072 | <entry align="left"> | |
2073 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
2074 | </entry> | |
2075 | <entry align="center"> | |
2076 | <inlineequation><mml:math> | |
2077 | <!-- eqn: 1 - {A sub c}:--> | |
2078 | <mml:mrow> | |
2079 | <mml:mn>1</mml:mn> | |
2080 | <mml:mo>-</mml:mo> | |
2081 | <mml:mfenced open="" close=""> | |
2082 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2083 | <mml:mi mathvariant="italic">c</mml:mi> | |
2084 | </mml:msub> | |
2085 | </mml:mfenced> | |
2086 | </mml:mrow> | |
2087 | </mml:math></inlineequation> | |
2088 | </entry> | |
2089 | </row> | |
2090 | <row> | |
2091 | <entry align="left"> | |
2092 | <constant>GL_PRIMARY_COLOR</constant> | |
2093 | </entry> | |
2094 | <entry align="left"> | |
2095 | <constant>GL_SRC_COLOR</constant> | |
2096 | </entry> | |
2097 | <entry align="center"> | |
2098 | <inlineequation><mml:math> | |
2099 | <!-- eqn: {C sub f}:--> | |
2100 | <mml:mfenced open="" close=""> | |
2101 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
2102 | <mml:mi mathvariant="italic">f</mml:mi> | |
2103 | </mml:msub> | |
2104 | </mml:mfenced> | |
2105 | </mml:math></inlineequation> | |
2106 | </entry> | |
2107 | </row> | |
2108 | <row> | |
2109 | <entry align="left"> | |
2110 | </entry> | |
2111 | <entry align="left"> | |
2112 | <constant>GL_ONE_MINUS_SRC_COLOR</constant> | |
2113 | </entry> | |
2114 | <entry align="center"> | |
2115 | <inlineequation><mml:math> | |
2116 | <!-- eqn: 1 - {C sub f}:--> | |
2117 | <mml:mrow> | |
2118 | <mml:mn>1</mml:mn> | |
2119 | <mml:mo>-</mml:mo> | |
2120 | <mml:mfenced open="" close=""> | |
2121 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
2122 | <mml:mi mathvariant="italic">f</mml:mi> | |
2123 | </mml:msub> | |
2124 | </mml:mfenced> | |
2125 | </mml:mrow> | |
2126 | </mml:math></inlineequation> | |
2127 | </entry> | |
2128 | </row> | |
2129 | <row> | |
2130 | <entry align="left"> | |
2131 | </entry> | |
2132 | <entry align="left"> | |
2133 | <constant>GL_SRC_ALPHA</constant> | |
2134 | </entry> | |
2135 | <entry align="center"> | |
2136 | <inlineequation><mml:math> | |
2137 | <!-- eqn: {A sub f}:--> | |
2138 | <mml:mfenced open="" close=""> | |
2139 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2140 | <mml:mi mathvariant="italic">f</mml:mi> | |
2141 | </mml:msub> | |
2142 | </mml:mfenced> | |
2143 | </mml:math></inlineequation> | |
2144 | </entry> | |
2145 | </row> | |
2146 | <row> | |
2147 | <entry align="left"> | |
2148 | </entry> | |
2149 | <entry align="left"> | |
2150 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
2151 | </entry> | |
2152 | <entry align="center"> | |
2153 | <inlineequation><mml:math> | |
2154 | <!-- eqn: 1 - {A sub f}:--> | |
2155 | <mml:mrow> | |
2156 | <mml:mn>1</mml:mn> | |
2157 | <mml:mo>-</mml:mo> | |
2158 | <mml:mfenced open="" close=""> | |
2159 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2160 | <mml:mi mathvariant="italic">f</mml:mi> | |
2161 | </mml:msub> | |
2162 | </mml:mfenced> | |
2163 | </mml:mrow> | |
2164 | </mml:math></inlineequation> | |
2165 | </entry> | |
2166 | </row> | |
2167 | <row> | |
2168 | <entry align="left"> | |
2169 | <constant>GL_PREVIOUS</constant> | |
2170 | </entry> | |
2171 | <entry align="left"> | |
2172 | <constant>GL_SRC_COLOR</constant> | |
2173 | </entry> | |
2174 | <entry align="center"> | |
2175 | <inlineequation><mml:math> | |
2176 | <!-- eqn: {C sub p}:--> | |
2177 | <mml:mfenced open="" close=""> | |
2178 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
2179 | <mml:mi mathvariant="italic">p</mml:mi> | |
2180 | </mml:msub> | |
2181 | </mml:mfenced> | |
2182 | </mml:math></inlineequation> | |
2183 | </entry> | |
2184 | </row> | |
2185 | <row> | |
2186 | <entry align="left"> | |
2187 | </entry> | |
2188 | <entry align="left"> | |
2189 | <constant>GL_ONE_MINUS_SRC_COLOR</constant> | |
2190 | </entry> | |
2191 | <entry align="center"> | |
2192 | <inlineequation><mml:math> | |
2193 | <!-- eqn: 1 - {C sub p}:--> | |
2194 | <mml:mrow> | |
2195 | <mml:mn>1</mml:mn> | |
2196 | <mml:mo>-</mml:mo> | |
2197 | <mml:mfenced open="" close=""> | |
2198 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
2199 | <mml:mi mathvariant="italic">p</mml:mi> | |
2200 | </mml:msub> | |
2201 | </mml:mfenced> | |
2202 | </mml:mrow> | |
2203 | </mml:math></inlineequation> | |
2204 | </entry> | |
2205 | </row> | |
2206 | <row> | |
2207 | <entry align="left"> | |
2208 | </entry> | |
2209 | <entry align="left"> | |
2210 | <constant>GL_SRC_ALPHA</constant> | |
2211 | </entry> | |
2212 | <entry align="center"> | |
2213 | <inlineequation><mml:math> | |
2214 | <!-- eqn: {A sub p}:--> | |
2215 | <mml:mfenced open="" close=""> | |
2216 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2217 | <mml:mi mathvariant="italic">p</mml:mi> | |
2218 | </mml:msub> | |
2219 | </mml:mfenced> | |
2220 | </mml:math></inlineequation> | |
2221 | </entry> | |
2222 | </row> | |
2223 | <row> | |
2224 | <entry align="left"> | |
2225 | </entry> | |
2226 | <entry align="left"> | |
2227 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
2228 | </entry> | |
2229 | <entry align="center"> | |
2230 | <inlineequation><mml:math> | |
2231 | <!-- eqn: 1 - {A sub p}:--> | |
2232 | <mml:mrow> | |
2233 | <mml:mn>1</mml:mn> | |
2234 | <mml:mo>-</mml:mo> | |
2235 | <mml:mfenced open="" close=""> | |
2236 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2237 | <mml:mi mathvariant="italic">p</mml:mi> | |
2238 | </mml:msub> | |
2239 | </mml:mfenced> | |
2240 | </mml:mrow> | |
2241 | </mml:math></inlineequation> | |
2242 | </entry> | |
2243 | </row> | |
2244 | </tbody> | |
2245 | </tgroup> | |
2246 | </informaltable> | |
2247 | <para> | |
2248 | For <constant>GL_TEXTUREn</constant> sources, | |
2249 | <inlineequation><mml:math> | |
2250 | <!-- eqn: C sub s:--> | |
2251 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
2252 | <mml:mi mathvariant="italic">s</mml:mi> | |
2253 | </mml:msub> | |
2254 | </mml:math></inlineequation> | |
2255 | and | |
2256 | <inlineequation><mml:math> | |
2257 | <!-- eqn: A sub s:--> | |
2258 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2259 | <mml:mi mathvariant="italic">s</mml:mi> | |
2260 | </mml:msub> | |
2261 | </mml:math></inlineequation> | |
2262 | represent the color | |
2263 | and alpha, respectively, produced from texture stage | |
2264 | <inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>. | |
2265 | </para> | |
2266 | <para> | |
2267 | The follow table describes the values assigned to | |
2268 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation>, | |
2269 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg1</mml:mi></mml:math></inlineequation>, | |
2270 | and | |
2271 | <inlineequation><mml:math><mml:mi mathvariant="italic">Arg2</mml:mi></mml:math></inlineequation> | |
2272 | based upon the alpha sources and operands: | |
2273 | </para> | |
2274 | <para> | |
2275 | </para> | |
2276 | <informaltable frame="topbot"> | |
2277 | <tgroup cols="3" align="left"> | |
2278 | <colspec/> | |
2279 | <colspec/> | |
2280 | <colspec align="center"/> | |
2281 | <thead> | |
2282 | <row> | |
2283 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
2284 | <constant>GL_SRCn_ALPHA</constant> | |
2285 | </emphasis></entry> | |
2286 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
2287 | <constant>GL_OPERANDn_ALPHA</constant> | |
2288 | </emphasis></entry> | |
2289 | <entry rowsep="1" align="center"><emphasis role="bold"> | |
2290 | Argument Value | |
2291 | </emphasis></entry> | |
2292 | </row> | |
2293 | </thead> | |
2294 | <tbody> | |
2295 | <row> | |
2296 | <entry align="left"> | |
2297 | <constant>GL_TEXTURE</constant> | |
2298 | </entry> | |
2299 | <entry align="left"> | |
2300 | <constant>GL_SRC_ALPHA</constant> | |
2301 | </entry> | |
2302 | <entry align="center"> | |
2303 | <inlineequation><mml:math> | |
2304 | <!-- eqn: {A sub s}:--> | |
2305 | <mml:mfenced open="" close=""> | |
2306 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2307 | <mml:mi mathvariant="italic">s</mml:mi> | |
2308 | </mml:msub> | |
2309 | </mml:mfenced> | |
2310 | </mml:math></inlineequation> | |
2311 | </entry> | |
2312 | </row> | |
2313 | <row> | |
2314 | <entry align="left"> | |
2315 | </entry> | |
2316 | <entry align="left"> | |
2317 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
2318 | </entry> | |
2319 | <entry align="center"> | |
2320 | <inlineequation><mml:math> | |
2321 | <!-- eqn: 1 - {A sub s}:--> | |
2322 | <mml:mrow> | |
2323 | <mml:mn>1</mml:mn> | |
2324 | <mml:mo>-</mml:mo> | |
2325 | <mml:mfenced open="" close=""> | |
2326 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2327 | <mml:mi mathvariant="italic">s</mml:mi> | |
2328 | </mml:msub> | |
2329 | </mml:mfenced> | |
2330 | </mml:mrow> | |
2331 | </mml:math></inlineequation> | |
2332 | </entry> | |
2333 | </row> | |
2334 | <row> | |
2335 | <entry align="left"> | |
2336 | <constant>GL_TEXTUREn</constant> | |
2337 | </entry> | |
2338 | <entry align="left"> | |
2339 | <constant>GL_SRC_ALPHA</constant> | |
2340 | </entry> | |
2341 | <entry align="center"> | |
2342 | <inlineequation><mml:math> | |
2343 | <!-- eqn: {A sub s}:--> | |
2344 | <mml:mfenced open="" close=""> | |
2345 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2346 | <mml:mi mathvariant="italic">s</mml:mi> | |
2347 | </mml:msub> | |
2348 | </mml:mfenced> | |
2349 | </mml:math></inlineequation> | |
2350 | </entry> | |
2351 | </row> | |
2352 | <row> | |
2353 | <entry align="left"> | |
2354 | </entry> | |
2355 | <entry align="left"> | |
2356 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
2357 | </entry> | |
2358 | <entry align="center"> | |
2359 | <inlineequation><mml:math> | |
2360 | <!-- eqn: 1 - {A sub s}:--> | |
2361 | <mml:mrow> | |
2362 | <mml:mn>1</mml:mn> | |
2363 | <mml:mo>-</mml:mo> | |
2364 | <mml:mfenced open="" close=""> | |
2365 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2366 | <mml:mi mathvariant="italic">s</mml:mi> | |
2367 | </mml:msub> | |
2368 | </mml:mfenced> | |
2369 | </mml:mrow> | |
2370 | </mml:math></inlineequation> | |
2371 | </entry> | |
2372 | </row> | |
2373 | <row> | |
2374 | <entry align="left"> | |
2375 | <constant>GL_CONSTANT</constant> | |
2376 | </entry> | |
2377 | <entry align="left"> | |
2378 | <constant>GL_SRC_ALPHA</constant> | |
2379 | </entry> | |
2380 | <entry align="center"> | |
2381 | <inlineequation><mml:math> | |
2382 | <!-- eqn: {A sub c}:--> | |
2383 | <mml:mfenced open="" close=""> | |
2384 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2385 | <mml:mi mathvariant="italic">c</mml:mi> | |
2386 | </mml:msub> | |
2387 | </mml:mfenced> | |
2388 | </mml:math></inlineequation> | |
2389 | </entry> | |
2390 | </row> | |
2391 | <row> | |
2392 | <entry align="left"> | |
2393 | </entry> | |
2394 | <entry align="left"> | |
2395 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
2396 | </entry> | |
2397 | <entry align="center"> | |
2398 | <inlineequation><mml:math> | |
2399 | <!-- eqn: 1 - {A sub c}:--> | |
2400 | <mml:mrow> | |
2401 | <mml:mn>1</mml:mn> | |
2402 | <mml:mo>-</mml:mo> | |
2403 | <mml:mfenced open="" close=""> | |
2404 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2405 | <mml:mi mathvariant="italic">c</mml:mi> | |
2406 | </mml:msub> | |
2407 | </mml:mfenced> | |
2408 | </mml:mrow> | |
2409 | </mml:math></inlineequation> | |
2410 | </entry> | |
2411 | </row> | |
2412 | <row> | |
2413 | <entry align="left"> | |
2414 | <constant>GL_PRIMARY_COLOR</constant> | |
2415 | </entry> | |
2416 | <entry align="left"> | |
2417 | <constant>GL_SRC_ALPHA</constant> | |
2418 | </entry> | |
2419 | <entry align="center"> | |
2420 | <inlineequation><mml:math> | |
2421 | <!-- eqn: {A sub f}:--> | |
2422 | <mml:mfenced open="" close=""> | |
2423 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2424 | <mml:mi mathvariant="italic">f</mml:mi> | |
2425 | </mml:msub> | |
2426 | </mml:mfenced> | |
2427 | </mml:math></inlineequation> | |
2428 | </entry> | |
2429 | </row> | |
2430 | <row> | |
2431 | <entry align="left"> | |
2432 | </entry> | |
2433 | <entry align="left"> | |
2434 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
2435 | </entry> | |
2436 | <entry align="center"> | |
2437 | <inlineequation><mml:math> | |
2438 | <!-- eqn: 1 - {A sub f}:--> | |
2439 | <mml:mrow> | |
2440 | <mml:mn>1</mml:mn> | |
2441 | <mml:mo>-</mml:mo> | |
2442 | <mml:mfenced open="" close=""> | |
2443 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2444 | <mml:mi mathvariant="italic">f</mml:mi> | |
2445 | </mml:msub> | |
2446 | </mml:mfenced> | |
2447 | </mml:mrow> | |
2448 | </mml:math></inlineequation> | |
2449 | </entry> | |
2450 | </row> | |
2451 | <row> | |
2452 | <entry align="left"> | |
2453 | <constant>GL_PREVIOUS</constant> | |
2454 | </entry> | |
2455 | <entry align="left"> | |
2456 | <constant>GL_SRC_ALPHA</constant> | |
2457 | </entry> | |
2458 | <entry align="center"> | |
2459 | <inlineequation><mml:math> | |
2460 | <!-- eqn: {A sub p}:--> | |
2461 | <mml:mfenced open="" close=""> | |
2462 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2463 | <mml:mi mathvariant="italic">p</mml:mi> | |
2464 | </mml:msub> | |
2465 | </mml:mfenced> | |
2466 | </mml:math></inlineequation> | |
2467 | </entry> | |
2468 | </row> | |
2469 | <row> | |
2470 | <entry align="left"> | |
2471 | </entry> | |
2472 | <entry align="left"> | |
2473 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
2474 | </entry> | |
2475 | <entry align="center"> | |
2476 | <inlineequation><mml:math> | |
2477 | <!-- eqn: 1 - {A sub p}:--> | |
2478 | <mml:mrow> | |
2479 | <mml:mn>1</mml:mn> | |
2480 | <mml:mo>-</mml:mo> | |
2481 | <mml:mfenced open="" close=""> | |
2482 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
2483 | <mml:mi mathvariant="italic">p</mml:mi> | |
2484 | </mml:msub> | |
2485 | </mml:mfenced> | |
2486 | </mml:mrow> | |
2487 | </mml:math></inlineequation> | |
2488 | </entry> | |
2489 | </row> | |
2490 | </tbody> | |
2491 | </tgroup> | |
2492 | </informaltable> | |
2493 | <para> | |
2494 | The RGB and alpha results of the texture function are multipled by the | |
2495 | values of <constant>GL_RGB_SCALE</constant> and <constant>GL_ALPHA_SCALE</constant>, respectively, and | |
2496 | clamped to the range | |
2497 | <inlineequation><mml:math> | |
2498 | <!-- eqn: [0, 1]:--> | |
2499 | <mml:mfenced open="[" close="]"> | |
2500 | <mml:mn>0</mml:mn> | |
2501 | <mml:mn>1</mml:mn> | |
2502 | </mml:mfenced> | |
2503 | </mml:math></inlineequation>. | |
2504 | </para> | |
2505 | <para> | |
2506 | If <parameter>pname</parameter> is <constant>GL_TEXTURE_ENV_COLOR</constant>, | |
2507 | <parameter>params</parameter> is a pointer to an array that holds an RGBA color consisting of four | |
2508 | values. | |
2509 | Integer color components are interpreted linearly such that the most | |
2510 | positive integer maps to 1.0, | |
2511 | and the most negative integer maps to -1.0. | |
2512 | The values are clamped to the range [0,1] when they are specified. | |
2513 | <inlineequation><mml:math> | |
2514 | <!-- eqn: C sub c:--> | |
2515 | <mml:msub><mml:mi mathvariant="italic">C</mml:mi> | |
2516 | <mml:mi mathvariant="italic">c</mml:mi> | |
2517 | </mml:msub> | |
2518 | </mml:math></inlineequation> | |
2519 | takes these four values. | |
2520 | </para> | |
2521 | <para> | |
2522 | If <parameter>pname</parameter> is <constant>GL_TEXTURE_LOD_BIAS</constant>, the value specified is added to the | |
2523 | texture level-of-detail parameter, that selects which mipmap, or mipmaps | |
2524 | depending upon the selected <constant>GL_TEXTURE_MIN_FILTER</constant>, will be sampled. | |
2525 | </para> | |
2526 | <para> | |
2527 | <constant>GL_TEXTURE_ENV_MODE</constant> defaults to <constant>GL_MODULATE</constant> and | |
2528 | <constant>GL_TEXTURE_ENV_COLOR</constant> defaults to (0, 0, 0, 0). | |
2529 | </para> | |
2530 | <para> | |
2531 | If <parameter>target</parameter> is <constant>GL_POINT_SPRITE</constant> and <parameter>pname</parameter> is <constant>GL_COORD_REPLACE</constant>, the boolean value specified | |
2532 | is used to either enable or disable point sprite texture coordinate replacement. The default value is <constant>GL_FALSE</constant>. | |
2533 | </para> | |
2534 | </refsect1> | |
2535 | <refsect1 id="notes"><title>Notes</title> | |
2536 | <para> | |
2537 | <constant>GL_REPLACE</constant> may only be used if the GL version is 1.1 or greater. | |
2538 | </para> | |
2539 | <para> | |
2540 | <constant>GL_TEXTURE_FILTER_CONTROL</constant> and <constant>GL_TEXTURE_LOD_BIAS</constant> may only be | |
2541 | used if the GL version is 1.4 or greater. | |
2542 | </para> | |
2543 | <para> | |
2544 | <constant>GL_COMBINE</constant> mode and its associated constants may only be used if the | |
2545 | GL version is 1.3 or greater. | |
2546 | </para> | |
2547 | <para> | |
2548 | <constant>GL_TEXTUREn</constant> may only be used if the GL version is 1.4 or greater. | |
2549 | </para> | |
2550 | <para> | |
2551 | Internal formats other than 1, 2, 3, or 4 may only be used if the GL | |
2552 | version is 1.1 or greater. | |
2553 | </para> | |
2554 | <para> | |
2555 | For OpenGL versions 1.3 and greater, or when the <code>ARB_multitexture</code> extension is supported, <function>glTexEnv</function> controls | |
2556 | the texture environment for the current active texture unit, selected by | |
2557 | <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>. | |
2558 | </para> | |
2559 | <para> | |
2560 | <constant>GL_POINT_SPRITE</constant> and <constant>GL_COORD_REPLACE</constant> are available | |
2561 | only if the GL version is 2.0 or greater. | |
2562 | </para> | |
2563 | </refsect1> | |
2564 | <refsect1 id="errors"><title>Errors</title> | |
2565 | <para> | |
2566 | <constant>GL_INVALID_ENUM</constant> is generated when <parameter>target</parameter> or <parameter>pname</parameter> is not | |
2567 | one of the accepted defined values, | |
2568 | or when <parameter>params</parameter> should have a defined constant value | |
2569 | (based on the value of <parameter>pname</parameter>) | |
2570 | and does not. | |
2571 | </para> | |
2572 | <para> | |
2573 | <constant>GL_INVALID_VALUE</constant> is generated if the <parameter>params</parameter> value for | |
2574 | <constant>GL_RGB_SCALE</constant> or <constant>GL_ALPHA_SCALE</constant> are not one of 1.0, 2.0, | |
2575 | or 4.0. | |
2576 | </para> | |
2577 | <para> | |
2578 | <constant>GL_INVALID_OPERATION</constant> is generated if <function>glTexEnv</function> | |
2579 | is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> | |
2580 | and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>. | |
2581 | </para> | |
2582 | </refsect1> | |
2583 | <refsect1 id="associatedgets"><title>Associated Gets</title> | |
2584 | <para> | |
2585 | <citerefentry><refentrytitle>glGetTexEnv</refentrytitle></citerefentry> | |
2586 | </para> | |
2587 | </refsect1> | |
2588 | <refsect1 id="seealso"><title>See Also</title> | |
2589 | <para> | |
2590 | <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>, | |
2591 | <citerefentry><refentrytitle>glCopyPixels</refentrytitle></citerefentry>, | |
2592 | <citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>, | |
2593 | <citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>, | |
2594 | <citerefentry><refentrytitle>glCopyTexSubImage1D</refentrytitle></citerefentry>, | |
2595 | <citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>, | |
2596 | <citerefentry><refentrytitle>glCopyTexSubImage3D</refentrytitle></citerefentry>, | |
2597 | <citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>, | |
2598 | <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>, | |
2599 | <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>, | |
2600 | <citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>, | |
2601 | <citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>, | |
2602 | <citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>, | |
2603 | <citerefentry><refentrytitle>glTexSubImage3D</refentrytitle></citerefentry> | |
2604 | </para> | |
2605 | </refsect1> | |
2606 | <refsect1 id="Copyright"><title>Copyright</title> | |
2607 | <para> | |
2608 | Copyright <trademark class="copyright"></trademark> 1991-2006 | |
2609 | Silicon Graphics, Inc. This document is licensed under the SGI | |
2610 | Free Software B License. For details, see | |
2611 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. | |
2612 | </para> | |
2613 | </refsect1> | |
2614 | </refentry> |