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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="glUniform"> | |
5 | <refmeta> | |
6 | <refentrytitle>glUniform</refentrytitle> | |
7 | <manvolnum>3G</manvolnum> | |
8 | </refmeta> | |
9 | <refnamediv> | |
10 | <refdescriptor>glUniform</refdescriptor> | |
11 | <refname>glUniform1f</refname> | |
12 | <refname>glUniform2f</refname> | |
13 | <refname>glUniform3f</refname> | |
14 | <refname>glUniform4f</refname> | |
15 | <refname>glUniform1i</refname> | |
16 | <refname>glUniform2i</refname> | |
17 | <refname>glUniform3i</refname> | |
18 | <refname>glUniform4i</refname> | |
19 | <refname>glUniform1fv</refname> | |
20 | <refname>glUniform2fv</refname> | |
21 | <refname>glUniform3fv</refname> | |
22 | <refname>glUniform4fv</refname> | |
23 | <refname>glUniform1iv</refname> | |
24 | <refname>glUniform2iv</refname> | |
25 | <refname>glUniform3iv</refname> | |
26 | <refname>glUniform4iv</refname> | |
27 | <refname>glUniformMatrix2fv</refname> | |
28 | <refname>glUniformMatrix3fv</refname> | |
29 | <refname>glUniformMatrix4fv</refname> | |
30 | <refname>glUniformMatrix2x3fv</refname> | |
31 | <refname>glUniformMatrix3x2fv</refname> | |
32 | <refname>glUniformMatrix2x4fv</refname> | |
33 | <refname>glUniformMatrix4x2fv</refname> | |
34 | <refname>glUniformMatrix3x4fv</refname> | |
35 | <refname>glUniformMatrix4x3fv</refname> | |
36 | <refpurpose>Specify the value of a uniform variable for the current program object</refpurpose> | |
37 | </refnamediv> | |
38 | <refsynopsisdiv><title>C Specification</title> | |
39 | <funcsynopsis> | |
40 | <funcprototype> | |
41 | <funcdef>void <function>glUniform1f</function></funcdef> | |
42 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
43 | <paramdef>GLfloat <parameter>v0</parameter></paramdef> | |
44 | </funcprototype> | |
45 | <funcprototype> | |
46 | <funcdef>void <function>glUniform2f</function></funcdef> | |
47 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
48 | <paramdef>GLfloat <parameter>v0</parameter></paramdef> | |
49 | <paramdef>GLfloat <parameter>v1</parameter></paramdef> | |
50 | </funcprototype> | |
51 | <funcprototype> | |
52 | <funcdef>void <function>glUniform3f</function></funcdef> | |
53 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
54 | <paramdef>GLfloat <parameter>v0</parameter></paramdef> | |
55 | <paramdef>GLfloat <parameter>v1</parameter></paramdef> | |
56 | <paramdef>GLfloat <parameter>v2</parameter></paramdef> | |
57 | </funcprototype> | |
58 | <funcprototype> | |
59 | <funcdef>void <function>glUniform4f</function></funcdef> | |
60 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
61 | <paramdef>GLfloat <parameter>v0</parameter></paramdef> | |
62 | <paramdef>GLfloat <parameter>v1</parameter></paramdef> | |
63 | <paramdef>GLfloat <parameter>v2</parameter></paramdef> | |
64 | <paramdef>GLfloat <parameter>v3</parameter></paramdef> | |
65 | </funcprototype> | |
66 | <funcprototype> | |
67 | <funcdef>void <function>glUniform1i</function></funcdef> | |
68 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
69 | <paramdef>GLint <parameter>v0</parameter></paramdef> | |
70 | </funcprototype> | |
71 | <funcprototype> | |
72 | <funcdef>void <function>glUniform2i</function></funcdef> | |
73 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
74 | <paramdef>GLint <parameter>v0</parameter></paramdef> | |
75 | <paramdef>GLint <parameter>v1</parameter></paramdef> | |
76 | </funcprototype> | |
77 | <funcprototype> | |
78 | <funcdef>void <function>glUniform3i</function></funcdef> | |
79 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
80 | <paramdef>GLint <parameter>v0</parameter></paramdef> | |
81 | <paramdef>GLint <parameter>v1</parameter></paramdef> | |
82 | <paramdef>GLint <parameter>v2</parameter></paramdef> | |
83 | </funcprototype> | |
84 | <funcprototype> | |
85 | <funcdef>void <function>glUniform4i</function></funcdef> | |
86 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
87 | <paramdef>GLint <parameter>v0</parameter></paramdef> | |
88 | <paramdef>GLint <parameter>v1</parameter></paramdef> | |
89 | <paramdef>GLint <parameter>v2</parameter></paramdef> | |
90 | <paramdef>GLint <parameter>v3</parameter></paramdef> | |
91 | </funcprototype> | |
92 | </funcsynopsis> | |
93 | </refsynopsisdiv> | |
94 | <refsect1 id="parameters"><title>Parameters</title> | |
95 | <variablelist> | |
96 | <varlistentry> | |
97 | <term><parameter>location</parameter></term> | |
98 | <listitem> | |
99 | <para>Specifies the location of the uniform variable | |
100 | to be modified.</para> | |
101 | </listitem> | |
102 | </varlistentry> | |
103 | <varlistentry> | |
104 | <term> | |
105 | <parameter>v0</parameter>, | |
106 | <parameter>v1</parameter>, | |
107 | <parameter>v2</parameter>, | |
108 | <parameter>v3</parameter> | |
109 | </term> | |
110 | <listitem> | |
111 | <para>Specifies the new values to be used for the | |
112 | specified uniform variable.</para> | |
113 | </listitem> | |
114 | </varlistentry> | |
115 | </variablelist> | |
116 | </refsect1> | |
117 | <refsynopsisdiv><title>C Specification</title> | |
118 | <funcsynopsis> | |
119 | <funcprototype> | |
120 | <funcdef>void <function>glUniform1fv</function></funcdef> | |
121 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
122 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
123 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
124 | </funcprototype> | |
125 | <funcprototype> | |
126 | <funcdef>void <function>glUniform2fv</function></funcdef> | |
127 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
128 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
129 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
130 | </funcprototype> | |
131 | <funcprototype> | |
132 | <funcdef>void <function>glUniform3fv</function></funcdef> | |
133 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
134 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
135 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
136 | </funcprototype> | |
137 | <funcprototype> | |
138 | <funcdef>void <function>glUniform4fv</function></funcdef> | |
139 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
140 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
141 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
142 | </funcprototype> | |
143 | <funcprototype> | |
144 | <funcdef>void <function>glUniform1iv</function></funcdef> | |
145 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
146 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
147 | <paramdef>const GLint *<parameter>value</parameter></paramdef> | |
148 | </funcprototype> | |
149 | <funcprototype> | |
150 | <funcdef>void <function>glUniform2iv</function></funcdef> | |
151 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
152 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
153 | <paramdef>const GLint *<parameter>value</parameter></paramdef> | |
154 | </funcprototype> | |
155 | <funcprototype> | |
156 | <funcdef>void <function>glUniform3iv</function></funcdef> | |
157 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
158 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
159 | <paramdef>const GLint *<parameter>value</parameter></paramdef> | |
160 | </funcprototype> | |
161 | <funcprototype> | |
162 | <funcdef>void <function>glUniform4iv</function></funcdef> | |
163 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
164 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
165 | <paramdef>const GLint *<parameter>value</parameter></paramdef> | |
166 | </funcprototype> | |
167 | </funcsynopsis> | |
168 | </refsynopsisdiv> | |
169 | <refsect1 id="parameters2"><title>Parameters</title> | |
170 | <variablelist> | |
171 | <varlistentry> | |
172 | <term><parameter>location</parameter></term> | |
173 | <listitem> | |
174 | <para>Specifies the location of the uniform value to | |
175 | be modified.</para> | |
176 | </listitem> | |
177 | </varlistentry> | |
178 | <varlistentry> | |
179 | <term><parameter>count</parameter></term> | |
180 | <listitem> | |
181 | <para>Specifies the number of elements that are to | |
182 | be modified. This should be 1 if the targeted | |
183 | uniform variable is not an array, and 1 or more if it is | |
184 | an array.</para> | |
185 | </listitem> | |
186 | </varlistentry> | |
187 | <varlistentry> | |
188 | <term><parameter>value</parameter></term> | |
189 | <listitem> | |
190 | <para>Specifies a pointer to an array of | |
191 | <parameter>count</parameter> values that will be | |
192 | used to update the specified uniform | |
193 | variable.</para> | |
194 | </listitem> | |
195 | </varlistentry> | |
196 | </variablelist> | |
197 | </refsect1> | |
198 | <refsynopsisdiv><title>C Specification</title> | |
199 | <funcsynopsis> | |
200 | <funcprototype> | |
201 | <funcdef>void <function>glUniformMatrix2fv</function></funcdef> | |
202 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
203 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
204 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
205 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
206 | </funcprototype> | |
207 | <funcprototype> | |
208 | <funcdef>void <function>glUniformMatrix3fv</function></funcdef> | |
209 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
210 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
211 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
212 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
213 | </funcprototype> | |
214 | <funcprototype> | |
215 | <funcdef>void <function>glUniformMatrix4fv</function></funcdef> | |
216 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
217 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
218 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
219 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
220 | </funcprototype> | |
221 | <funcprototype> | |
222 | <funcdef>void <function>glUniformMatrix2x3fv</function></funcdef> | |
223 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
224 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
225 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
226 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
227 | </funcprototype> | |
228 | <funcprototype> | |
229 | <funcdef>void <function>glUniformMatrix3x2fv</function></funcdef> | |
230 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
231 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
232 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
233 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
234 | </funcprototype> | |
235 | <funcprototype> | |
236 | <funcdef>void <function>glUniformMatrix2x4fv</function></funcdef> | |
237 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
238 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
239 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
240 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
241 | </funcprototype> | |
242 | <funcprototype> | |
243 | <funcdef>void <function>glUniformMatrix4x2fv</function></funcdef> | |
244 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
245 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
246 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
247 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
248 | </funcprototype> | |
249 | <funcprototype> | |
250 | <funcdef>void <function>glUniformMatrix3x4fv</function></funcdef> | |
251 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
252 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
253 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
254 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
255 | </funcprototype> | |
256 | <funcprototype> | |
257 | <funcdef>void <function>glUniformMatrix4x3fv</function></funcdef> | |
258 | <paramdef>GLint <parameter>location</parameter></paramdef> | |
259 | <paramdef>GLsizei <parameter>count</parameter></paramdef> | |
260 | <paramdef>GLboolean <parameter>transpose</parameter></paramdef> | |
261 | <paramdef>const GLfloat *<parameter>value</parameter></paramdef> | |
262 | </funcprototype> | |
263 | </funcsynopsis> | |
264 | </refsynopsisdiv> | |
265 | <refsect1 id="parameters3"><title>Parameters</title> | |
266 | <variablelist> | |
267 | <varlistentry> | |
268 | <term><parameter>location</parameter></term> | |
269 | <listitem> | |
270 | <para>Specifies the location of the uniform value to | |
271 | be modified.</para> | |
272 | </listitem> | |
273 | </varlistentry> | |
274 | <varlistentry> | |
275 | <term><parameter>count</parameter></term> | |
276 | <listitem> | |
277 | <para>Specifies the number of matrices that are to | |
278 | be modified. This should be 1 if the targeted | |
279 | uniform variable is not an array of matrices, and 1 or more if it is | |
280 | an array of matrices.</para> | |
281 | </listitem> | |
282 | </varlistentry> | |
283 | <varlistentry> | |
284 | <term><parameter>transpose</parameter></term> | |
285 | <listitem> | |
286 | <para>Specifies whether to transpose the matrix as | |
287 | the values are loaded into the uniform | |
288 | variable.</para> | |
289 | </listitem> | |
290 | </varlistentry> | |
291 | <varlistentry> | |
292 | <term><parameter>value</parameter></term> | |
293 | <listitem> | |
294 | <para>Specifies a pointer to an array of | |
295 | <parameter>count</parameter> values that will be | |
296 | used to update the specified uniform | |
297 | variable.</para> | |
298 | </listitem> | |
299 | </varlistentry> | |
300 | </variablelist> | |
301 | </refsect1> | |
302 | <refsect1 id="description"><title>Description</title> | |
303 | <para><function>glUniform</function> modifies the value of a | |
304 | uniform variable or a uniform variable array. The location of | |
305 | the uniform variable to be modified is specified by | |
306 | <parameter>location</parameter>, which should be a value | |
307 | returned by | |
308 | <citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>. | |
309 | <function>glUniform</function> operates on the program object | |
310 | that was made part of current state by calling | |
311 | <citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>.</para> | |
312 | ||
313 | <para>The commands <function>glUniform{1|2|3|4}{f|i}</function> | |
314 | are used to change the value of the uniform variable specified | |
315 | by <parameter>location</parameter> using the values passed as | |
316 | arguments. The number specified in the command should match the | |
317 | number of components in the data type of the specified uniform | |
318 | variable (e.g., <function>1</function> for float, int, bool; | |
319 | <function>2</function> for vec2, ivec2, bvec2, etc.). The suffix | |
320 | <function>f</function> indicates that floating-point values are | |
321 | being passed; the suffix <function>i</function> indicates that | |
322 | integer values are being passed, and this type should also match | |
323 | the data type of the specified uniform variable. The | |
324 | <function>i</function> variants of this function should be used | |
325 | to provide values for uniform variables defined as int, ivec2, | |
326 | ivec3, ivec4, or arrays of these. The <function>f</function> | |
327 | variants should be used to provide values for uniform variables | |
328 | of type float, vec2, vec3, vec4, or arrays of these. Either the | |
329 | <function>i</function> or the <function>f</function> variants | |
330 | may be used to provide values for uniform variables of type | |
331 | bool, bvec2, bvec3, bvec4, or arrays of these. The uniform | |
332 | variable will be set to false if the input value is 0 or 0.0f, | |
333 | and it will be set to true otherwise.</para> | |
334 | ||
335 | <para>All active uniform variables defined in a program object | |
336 | are initialized to 0 when the program object is linked | |
337 | successfully. They retain the values assigned to them by a call | |
338 | to <function>glUniform </function> until the next successful | |
339 | link operation occurs on the program object, when they are once | |
340 | again initialized to 0.</para> | |
341 | ||
342 | <para>The commands <function>glUniform{1|2|3|4}{f|i}v</function> | |
343 | can be used to modify a single uniform variable or a uniform | |
344 | variable array. These commands pass a count and a pointer to the | |
345 | values to be loaded into a uniform variable or a uniform | |
346 | variable array. A count of 1 should be used if modifying the | |
347 | value of a single uniform variable, and a count of 1 or greater | |
348 | can be used to modify an entire array or part of an array. When | |
349 | loading <emphasis>n</emphasis> elements starting at an arbitrary | |
350 | position <emphasis>m</emphasis> in a uniform variable array, | |
351 | elements <emphasis>m</emphasis> + <emphasis>n</emphasis> - 1 in | |
352 | the array will be replaced with the new values. If | |
353 | <parameter>m</parameter> + <parameter>n</parameter> - 1 is | |
354 | larger than the size of the uniform variable array, values for | |
355 | all array elements beyond the end of the array will be ignored. | |
356 | The number specified in the name of the command indicates the | |
357 | number of components for each element in | |
358 | <parameter>value</parameter>, and it should match the number of | |
359 | components in the data type of the specified uniform variable | |
360 | (e.g., <function>1</function> for float, int, bool; | |
361 | <function>2</function> for vec2, ivec2, bvec2, etc.). The data | |
362 | type specified in the name of the command must match the data | |
363 | type for the specified uniform variable as described previously | |
364 | for <function>glUniform{1|2|3|4}{f|i}</function>.</para> | |
365 | ||
366 | <para>For uniform variable arrays, each element of the array is | |
367 | considered to be of the type indicated in the name of the | |
368 | command (e.g., <function>glUniform3f</function> or | |
369 | <function>glUniform3fv</function> can be used to load a uniform | |
370 | variable array of type vec3). The number of elements of the | |
371 | uniform variable array to be modified is specified by | |
372 | <parameter>count</parameter></para> | |
373 | ||
374 | <para>The commands | |
375 | <function>glUniformMatrix{2|3|4|2x3|3x2|2x4|4x2|3x4|4x3}fv</function> | |
376 | are used to modify a matrix or an array of matrices. The numbers in the | |
377 | command name are interpreted as the dimensionality of the matrix. | |
378 | The number <function>2</function> indicates a 2 × 2 matrix | |
379 | (i.e., 4 values), the number <function>3</function> indicates a | |
380 | 3 × 3 matrix (i.e., 9 values), and the number | |
381 | <function>4</function> indicates a 4 × 4 matrix (i.e., 16 | |
382 | values). Non-square matrix dimensionality is explicit, with the first | |
383 | number representing the number of columns and the second number | |
384 | representing the number of rows. For example, | |
385 | <function>2x4</function> indicates a 2 × 4 matrix with 2 columns | |
386 | and 4 rows (i.e., 8 values). | |
387 | If <parameter>transpose</parameter> is | |
388 | <constant>GL_FALSE</constant>, each matrix is assumed to be | |
389 | supplied in column major order. If | |
390 | <parameter>transpose</parameter> is | |
391 | <constant>GL_TRUE</constant>, each matrix is assumed to be | |
392 | supplied in row major order. The <parameter>count</parameter> | |
393 | argument indicates the number of matrices to be passed. A count | |
394 | of 1 should be used if modifying the value of a single matrix, | |
395 | and a count greater than 1 can be used to modify an array of | |
396 | matrices.</para> | |
397 | </refsect1> | |
398 | <refsect1 id="notes"><title>Notes</title> | |
399 | <para><function>glUniform</function> is available only if the GL | |
400 | version is 2.0 or greater.</para> | |
401 | ||
402 | <para><function>glUniformMatrix{2x3|3x2|2x4|4x2|3x4|4x3}fv</function> | |
403 | is available only if the GL version is 2.1 or greater.</para> | |
404 | ||
405 | <para><function>glUniform1i</function> and | |
406 | <function>glUniform1iv</function> are the only two functions | |
407 | that may be used to load uniform variables defined as sampler | |
408 | types. Loading samplers with any other function will result in a | |
409 | <constant>GL_INVALID_OPERATION</constant> error.</para> | |
410 | ||
411 | <para>If <parameter>count</parameter> is greater than 1 and the | |
412 | indicated uniform variable is not an array, a | |
413 | <constant>GL_INVALID_OPERATION</constant> error is generated and the | |
414 | specified uniform variable will remain unchanged.</para> | |
415 | ||
416 | <para>Other than the preceding exceptions, if the type and size | |
417 | of the uniform variable as defined in the shader do not match | |
418 | the type and size specified in the name of the command used to | |
419 | load its value, a <constant>GL_INVALID_OPERATION</constant> error will | |
420 | be generated and the specified uniform variable will remain | |
421 | unchanged.</para> | |
422 | ||
423 | <para>If <parameter>location</parameter> is a value other than | |
424 | -1 and it does not represent a valid uniform variable location | |
425 | in the current program object, an error will be generated, and | |
426 | no changes will be made to the uniform variable storage of the | |
427 | current program object. If <parameter>location</parameter> is | |
428 | equal to -1, the data passed in will be silently ignored and the | |
429 | specified uniform variable will not be changed.</para> | |
430 | </refsect1> | |
431 | <refsect1 id="errors"><title>Errors</title> | |
432 | <para><constant>GL_INVALID_OPERATION</constant> is generated if there | |
433 | is no current program object.</para> | |
434 | ||
435 | <para><constant>GL_INVALID_OPERATION</constant> is generated if the | |
436 | size of the uniform variable declared in the shader does not | |
437 | match the size indicated by the <function>glUniform</function> | |
438 | command.</para> | |
439 | ||
440 | <para><constant>GL_INVALID_OPERATION</constant> is generated if one of | |
441 | the integer variants of this function is used to load a uniform | |
442 | variable of type float, vec2, vec3, vec4, or an array of these, | |
443 | or if one of the floating-point variants of this function is | |
444 | used to load a uniform variable of type int, ivec2, ivec3, or | |
445 | ivec4, or an array of these.</para> | |
446 | ||
447 | <para><constant>GL_INVALID_OPERATION</constant> is generated if | |
448 | <parameter>location</parameter> is an invalid uniform location | |
449 | for the current program object and | |
450 | <parameter>location</parameter> is not equal to -1.</para> | |
451 | ||
452 | <para><constant>GL_INVALID_VALUE</constant> is generated if | |
453 | <parameter>count</parameter> is less than 0.</para> | |
454 | ||
455 | <para><constant>GL_INVALID_OPERATION</constant> is generated if | |
456 | <parameter>count</parameter> is greater than 1 and the indicated | |
457 | uniform variable is not an array variable.</para> | |
458 | ||
459 | <para><constant>GL_INVALID_OPERATION</constant> is generated if a | |
460 | sampler is loaded using a command other than | |
461 | <function>glUniform1i</function> and | |
462 | <function>glUniform1iv</function>.</para> | |
463 | ||
464 | <para><constant>GL_INVALID_OPERATION</constant> is generated if | |
465 | <function>glUniform</function> is executed between the execution | |
466 | of | |
467 | <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> | |
468 | and the corresponding execution of | |
469 | <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.</para> | |
470 | </refsect1> | |
471 | <refsect1 id="associatedgets"><title>Associated Gets</title> | |
472 | <para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> | |
473 | with the argument <constant>GL_CURRENT_PROGRAM</constant></para> | |
474 | ||
475 | <para><citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry> | |
476 | with the handle of a program object and the index of an active uniform variable</para> | |
477 | ||
478 | <para><citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry> | |
479 | with the handle of a program object and the location of a | |
480 | uniform variable</para> | |
481 | ||
482 | <para><citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry> | |
483 | with the handle of a program object and the name of a uniform | |
484 | variable</para> | |
485 | </refsect1> | |
486 | <refsect1 id="seealso"><title>See Also</title> | |
487 | <para><citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>, | |
488 | <citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry></para> | |
489 | </refsect1> | |
490 | <refsect1 id="Copyright"><title>Copyright</title> | |
491 | <para> | |
492 | Copyright <trademark class="copyright"></trademark> 2003-2005 3Dlabs Inc. Ltd. | |
493 | This material may be distributed subject to the terms and conditions set forth in | |
494 | the Open Publication License, v 1.0, 8 June 1999. | |
495 | <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>. | |
496 | </para> | |
497 | </refsect1> | |
498 | </refentry> |