upstream-doc/man3/glGetActiveUniformsiv.xml

   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="glGetActiveUniformsiv">
   5     <refmeta>
   6     <refentrytitle>glGetActiveUniformsiv</refentrytitle>
   7     <manvolnum>3G</manvolnum>
   8     </refmeta>
   9     <refnamediv>
  10     <refname>glGetActiveUniformsiv</refname>
  11     <refpurpose>Returns information about several active uniform variables for the specified program object</refpurpose>
  12     </refnamediv>
  13     <refsynopsisdiv><title>C Specification</title>
  14     <funcsynopsis>
  15         <funcprototype>
  16         <funcdef>void <function>glGetActiveUniformsiv</function></funcdef>
  17         <paramdef>GLuint <parameter>program</parameter></paramdef>
  18         <paramdef>GLsizei <parameter>uniformCount</parameter></paramdef>
  19         <paramdef>const GLuint *<parameter>uniformIndices</parameter></paramdef>
  20         <paramdef>GLenum <parameter>pname</parameter></paramdef>
  21         <paramdef>GLint *<parameter>params</parameter></paramdef>
  22         </funcprototype>
  23     </funcsynopsis>
  24     </refsynopsisdiv>
  25     <refsect1 id="parameters"><title>Parameters</title>
  26     <variablelist>
  27         <varlistentry>
  28         <term><parameter>program</parameter></term>
  29         <listitem>
  30             <para>Specifies the program object to be queried.</para>
  31         </listitem>
  32         </varlistentry>
  33         <varlistentry>
  34         <term><parameter>uniformCount</parameter></term>
  35         <listitem>
  36             <para>Specifies both the number of elements in the array of indices <parameter>uniformIndices</parameter> and the
  37             number of parameters written to <parameter>params</parameter> upon successful return.</para>
  38         </listitem>
  39         </varlistentry>
  40         <varlistentry>
  41         <term><parameter>uniformIndices</parameter></term>
  42         <listitem>
  43             <para>Specifies the address of an array of <parameter>uniformCount</parameter> integers containing the indices of
  44             uniforms within <parameter>program</parameter> whose parameter <parameter>pname</parameter> pname.</para>
  45         </listitem>
  46         </varlistentry>
  47         <varlistentry>
  48         <term><parameter>pname</parameter></term>
  49         <listitem>
  50             <para>Specifies the property of the each uniform in <parameter>uniformIndices</parameter> that should be
  51             written into the corresponding element of <parameter>params</parameter>.</para>
  52         </listitem>
  53         </varlistentry>
  54         <varlistentry>
  55         <term><parameter>params</parameter></term>
  56         <listitem>
  57             <para>Specifies the address of an array of <parameter>uniformCount</parameter> integers which are to
  58             receive the value of <parameter>pname</parameter> for each uniform in <parameter>uniformIndices</parameter>.</para>
  59         </listitem>
  60         </varlistentry>
  61     </variablelist>
  62     </refsect1>
  63     <refsect1 id="description"><title>Description</title>
  64         <para>
  65             <function>glGetActiveUniformsiv</function> queries the value of the parameter named <parameter>pname</parameter>
  66             for each of the uniforms within <parameter>program</parameter> whose indices are specified in the array of
  67             <parameter>uniformCount</parameter> unsigned integers <parameter>uniformIndices</parameter>. Upon success,
  68             the value of the parameter for each uniform is written into the corresponding entry in the array whose
  69             address is given in <parameter>params</parameter>. If an error is generated, nothing is written into
  70             <parameter>params</parameter>.
  71         </para>
  72         <para>
  73             If <parameter>pname</parameter> is <constant>GL_UNIFORM_TYPE</constant>, then an array identifying the types
  74             of uniforms specified by the corresponding array of <parameter>uniformIndices</parameter> is returned. The
  75             returned types can be any of the values from the following table:
  76         <informaltable frame="topbot">
  77             <tgroup cols="2" align="left">
  78                 <colspec colwidth="1.1*" />
  79                 <colspec colwidth="1*" />
  80                 <thead>
  81                     <row>
  82                         <entry rowsep="1" align="left"><emphasis role="bold">
  83                         Returned Symbolic Contant
  84                         </emphasis></entry>
  85                         <entry rowsep="1" align="left"><emphasis role="bold">
  86                         Shader Uniform Type
  87                         </emphasis></entry>
  88                     </row>
  89                 </thead>
  90                 <tbody>
  91                     <row>
  92                         <entry align="left">
  93                             <constant>GL_FLOAT</constant>
  94                         </entry>
  95                         <entry align="left">
  96                             <constant>float</constant>
  97                         </entry>
  98                     </row>
  99                     <row>
 100                         <entry align="left">
 101                             <constant>GL_FLOAT_VEC2</constant>
 102                         </entry>
 103                         <entry align="left">
 104                             <constant>vec2</constant>
 105                         </entry>
 106                     </row>
 107                     <row>
 108                         <entry align="left">
 109                             <constant>GL_FLOAT_VEC3</constant>
 110                         </entry>
 111                         <entry align="left">
 112                             <constant>vec3</constant>
 113                         </entry>
 114                     </row>
 115                     <row>
 116                         <entry align="left">
 117                             <constant>GL_FLOAT_VEC4</constant>
 118                         </entry>
 119                         <entry align="left">
 120                             <constant>vec4</constant>
 121                         </entry>
 122                     </row>
 123                     <row>
 124                         <entry align="left">
 125                             <constant>GL_INT</constant>
 126                         </entry>
 127                         <entry align="left">
 128                             <constant>int</constant>
 129                         </entry>
 130                     </row>
 131                     <row>
 132                         <entry align="left">
 133                             <constant>GL_INT_VEC2</constant>
 134                         </entry>
 135                         <entry align="left">
 136                             <constant>ivec2</constant>
 137                         </entry>
 138                     </row>
 139                     <row>
 140                         <entry align="left">
 141                             <constant>GL_INT_VEC3</constant>
 142                         </entry>
 143                         <entry align="left">
 144                             <constant>ivec3</constant>
 145                         </entry>
 146                     </row>
 147                     <row>
 148                         <entry align="left">
 149                             <constant>GL_INT_VEC4</constant>
 150                         </entry>
 151                         <entry align="left">
 152                             <constant>ivec4</constant>
 153                         </entry>
 154                     </row>
 155                     <row>
 156                         <entry align="left">
 157                             <constant>GL_UNSIGNED_INT</constant>
 158                         </entry>
 159                         <entry align="left">
 160                             <constant>unsigned int</constant>
 161                         </entry>
 162                     </row>
 163                     <row>
 164                         <entry align="left">
 165                             <constant>GL_UNSIGNED_INT_VEC2</constant>
 166                         </entry>
 167                         <entry align="left">
 168                             <constant>uvec2</constant>
 169                         </entry>
 170                     </row>
 171                     <row>
 172                         <entry align="left">
 173                             <constant>GL_UNSIGNED_INT_VEC3</constant>
 174                         </entry>
 175                         <entry align="left">
 176                             <constant>uvec3</constant>
 177                         </entry>
 178                     </row>
 179                     <row>
 180                         <entry align="left">
 181                             <constant>GL_UNSIGNED_INT_VEC4</constant>
 182                         </entry>
 183                         <entry align="left">
 184                             <constant>uvec4</constant>
 185                         </entry>
 186                     </row>
 187                     <row>
 188                         <entry align="left">
 189                             <constant>GL_BOOL</constant>
 190                         </entry>
 191                         <entry align="left">
 192                             <constant>bool</constant>
 193                         </entry>
 194                     </row>
 195                     <row>
 196                         <entry align="left">
 197                             <constant>GL_BOOL_VEC2</constant>
 198                         </entry>
 199                         <entry align="left">
 200                             <constant>bvec2</constant>
 201                         </entry>
 202                     </row>
 203                     <row>
 204                         <entry align="left">
 205                             <constant>GL_BOOL_VEC3</constant>
 206                         </entry>
 207                         <entry align="left">
 208                             <constant>bvec3</constant>
 209                         </entry>
 210                     </row>
 211                     <row>
 212                         <entry align="left">
 213                             <constant>GL_BOOL_VEC4</constant>
 214                         </entry>
 215                         <entry align="left">
 216                             <constant>bvec4</constant>
 217                         </entry>
 218                     </row>
 219                     <row>
 220                         <entry align="left">
 221                             <constant>GL_FLOAT_MAT2</constant>
 222                         </entry>
 223                         <entry align="left">
 224                             <constant>mat2</constant>
 225                         </entry>
 226                     </row>
 227                     <row>
 228                         <entry align="left">
 229                             <constant>GL_FLOAT_MAT3</constant>
 230                         </entry>
 231                         <entry align="left">
 232                             <constant>mat3</constant>
 233                         </entry>
 234                     </row>
 235                     <row>
 236                         <entry align="left">
 237                             <constant>GL_FLOAT_MAT4</constant>
 238                         </entry>
 239                         <entry align="left">
 240                             <constant>mat4</constant>
 241                         </entry>
 242                     </row>
 243                     <row>
 244                         <entry align="left">
 245                             <constant>GL_FLOAT_MAT2x3</constant>
 246                         </entry>
 247                         <entry align="left">
 248                             <constant>mat2x3</constant>
 249                         </entry>
 250                     </row>
 251                     <row>
 252                         <entry align="left">
 253                             <constant>GL_FLOAT_MAT2x4</constant>
 254                         </entry>
 255                         <entry align="left">
 256                             <constant>mat2x4</constant>
 257                         </entry>
 258                     </row>
 259                     <row>
 260                         <entry align="left">
 261                             <constant>GL_FLOAT_MAT3x2</constant>
 262                         </entry>
 263                         <entry align="left">
 264                             <constant>mat3x2</constant>
 265                         </entry>
 266                     </row>
 267                     <row>
 268                         <entry align="left">
 269                             <constant>GL_FLOAT_MAT3x4</constant>
 270                         </entry>
 271                         <entry align="left">
 272                             <constant>mat3x4</constant>
 273                         </entry>
 274                     </row>
 275                     <row>
 276                         <entry align="left">
 277                             <constant>GL_FLOAT_MAT4x2</constant>
 278                         </entry>
 279                         <entry align="left">
 280                             <constant>mat4x2</constant>
 281                         </entry>
 282                     </row>
 283                     <row>
 284                         <entry align="left">
 285                             <constant>GL_FLOAT_MAT4x3</constant>
 286                         </entry>
 287                         <entry align="left">
 288                             <constant>mat4x3</constant>
 289                         </entry>
 290                     </row>
 291                     <row>
 292                         <entry align="left">
 293                             <constant>GL_SAMPLER_1D</constant>
 294                         </entry>
 295                         <entry align="left">
 296                             <constant>sampler1D</constant>
 297                         </entry>
 298                     </row>
 299                     <row>
 300                         <entry align="left">
 301                             <constant>GL_SAMPLER_2D</constant>
 302                         </entry>
 303                         <entry align="left">
 304                             <constant>sampler2D</constant>
 305                         </entry>
 306                     </row>
 307                     <row>
 308                         <entry align="left">
 309                             <constant>GL_SAMPLER_3D</constant>
 310                         </entry>
 311                         <entry align="left">
 312                             <constant>sampler3D</constant>
 313                         </entry>
 314                     </row>
 315                     <row>
 316                         <entry align="left">
 317                             <constant>GL_SAMPLER_CUBE</constant>
 318                         </entry>
 319                         <entry align="left">
 320                             <constant>samplerCube</constant>
 321                         </entry>
 322                     </row>
 323                     <row>
 324                         <entry align="left">
 325                             <constant>GL_SAMPLER_1D_SHADOW</constant>
 326                         </entry>
 327                         <entry align="left">
 328                             <constant>sampler1DShadow</constant>
 329                         </entry>
 330                     </row>
 331                     <row>
 332                         <entry align="left">
 333                             <constant>GL_SAMPLER_2D_SHADOW</constant>
 334                         </entry>
 335                         <entry align="left">
 336                             <constant>sampler2DShadow</constant>
 337                         </entry>
 338                     </row>
 339                     <row>
 340                         <entry align="left">
 341                             <constant>GL_SAMPLER_1D_ARRAY</constant>
 342                         </entry>
 343                         <entry align="left">
 344                             <constant>sampler1DArray</constant>
 345                         </entry>
 346                     </row>
 347                     <row>
 348                         <entry align="left">
 349                             <constant>GL_SAMPLER_2D_ARRAY</constant>
 350                         </entry>
 351                         <entry align="left">
 352                             <constant>sampler2DArray</constant>
 353                         </entry>
 354                     </row>
 355                     <row>
 356                         <entry align="left">
 357                             <constant>GL_SAMPLER_1D_ARRAY_SHADOW</constant>
 358                         </entry>
 359                         <entry align="left">
 360                             <constant>sampler1DArrayShadow</constant>
 361                         </entry>
 362                     </row>
 363                     <row>
 364                         <entry align="left">
 365                             <constant>GL_SAMPLER_2D_ARRAY_SHADOW</constant>
 366                         </entry>
 367                         <entry align="left">
 368                             <constant>sampler2DArrayShadow</constant>
 369                         </entry>
 370                     </row>
 371                     <row>
 372                         <entry align="left">
 373                             <constant>GL_SAMPLER_2D_MULTISAMPLE</constant>
 374                         </entry>
 375                         <entry align="left">
 376                             <constant>sampler2DMS</constant>
 377                         </entry>
 378                     </row>
 379                     <row>
 380                         <entry align="left">
 381                             <constant>GL_SAMPLER_2D_MULTISAMPLE_ARRAY</constant>
 382                         </entry>
 383                         <entry align="left">
 384                             <constant>sampler2DMSArray</constant>
 385                         </entry>
 386                     </row>
 387                     <row>
 388                         <entry align="left">
 389                             <constant>GL_SAMPLER_CUBE_SHADOW</constant>
 390                         </entry>
 391                         <entry align="left">
 392                             <constant>samplerCubeShadow</constant>
 393                         </entry>
 394                     </row>
 395                     <row>
 396                         <entry align="left">
 397                             <constant>GL_SAMPLER_BUFFER</constant>
 398                         </entry>
 399                         <entry align="left">
 400                             <constant>samplerBuffer</constant>
 401                         </entry>
 402                     </row>
 403                     <row>
 404                         <entry align="left">
 405                             <constant>GL_SAMPLER_2D_RECT</constant>
 406                         </entry>
 407                         <entry align="left">
 408                             <constant>sampler2DRect</constant>
 409                         </entry>
 410                     </row>
 411                     <row>
 412                         <entry align="left">
 413                             <constant>GL_SAMPLER_2D_RECT_SHADOW</constant>
 414                         </entry>
 415                         <entry align="left">
 416                             <constant>sampler2DRectShadow</constant>
 417                         </entry>
 418                     </row>
 419                     <row>
 420                         <entry align="left">
 421                             <constant>GL_INT_SAMPLER_1D</constant>
 422                         </entry>
 423                         <entry align="left">
 424                             <constant>isampler1D</constant>
 425                         </entry>
 426                     </row>
 427                     <row>
 428                         <entry align="left">
 429                             <constant>GL_INT_SAMPLER_2D</constant>
 430                         </entry>
 431                         <entry align="left">
 432                             <constant>isampler2D</constant>
 433                         </entry>
 434                     </row>
 435                     <row>
 436                         <entry align="left">
 437                             <constant>GL_INT_SAMPLER_3D</constant>
 438                         </entry>
 439                         <entry align="left">
 440                             <constant>isampler3D</constant>
 441                         </entry>
 442                     </row>
 443                     <row>
 444                         <entry align="left">
 445                             <constant>GL_INT_SAMPLER_CUBE</constant>
 446                         </entry>
 447                         <entry align="left">
 448                             <constant>isamplerCube</constant>
 449                         </entry>
 450                     </row>
 451                     <row>
 452                         <entry align="left">
 453                             <constant>GL_INT_SAMPLER_1D_ARRAY</constant>
 454                         </entry>
 455                         <entry align="left">
 456                             <constant>isampler1DArray</constant>
 457                         </entry>
 458                     </row>
 459                     <row>
 460                         <entry align="left">
 461                             <constant>GL_INT_SAMPLER_2D_ARRAY</constant>
 462                         </entry>
 463                         <entry align="left">
 464                             <constant>isampler2DArray</constant>
 465                         </entry>
 466                     </row>
 467                     <row>
 468                         <entry align="left">
 469                             <constant>GL_INT_SAMPLER_2D_MULTISAMPLE</constant>
 470                         </entry>
 471                         <entry align="left">
 472                             <constant>isampler2DMS</constant>
 473                         </entry>
 474                     </row>
 475                     <row>
 476                         <entry align="left">
 477                             <constant>GL_INT_SAMPLER_2D_MULTISAMPLE_ARRAY</constant>
 478                         </entry>
 479                         <entry align="left">
 480                             <constant>isampler2DMSArray</constant>
 481                         </entry>
 482                     </row>
 483                     <row>
 484                         <entry align="left">
 485                             <constant>GL_INT_SAMPLER_BUFFER</constant>
 486                         </entry>
 487                         <entry align="left">
 488                             <constant>isamplerBuffer</constant>
 489                         </entry>
 490                     </row>
 491                     <row>
 492                         <entry align="left">
 493                             <constant>GL_INT_SAMPLER_2D_RECT</constant>
 494                         </entry>
 495                         <entry align="left">
 496                             <constant>isampler2DRect</constant>
 497                         </entry>
 498                     </row>
 499                     <row>
 500                         <entry align="left">
 501                             <constant>GL_UNSIGNED_INT_SAMPLER_1D</constant>
 502                         </entry>
 503                         <entry align="left">
 504                             <constant>usampler1D</constant>
 505                         </entry>
 506                     </row>
 507                     <row>
 508                         <entry align="left">
 509                             <constant>GL_UNSIGNED_INT_SAMPLER_2D</constant>
 510                         </entry>
 511                         <entry align="left">
 512                             <constant>usampler2D</constant>
 513                         </entry>
 514                     </row>
 515                     <row>
 516                         <entry align="left">
 517                             <constant>GL_UNSIGNED_INT_SAMPLER_3D</constant>
 518                         </entry>
 519                         <entry align="left">
 520                             <constant>usampler3D</constant>
 521                         </entry>
 522                     </row>
 523                     <row>
 524                         <entry align="left">
 525                             <constant>GL_UNSIGNED_INT_SAMPLER_CUBE</constant>
 526                         </entry>
 527                         <entry align="left">
 528                             <constant>usamplerCube</constant>
 529                         </entry>
 530                     </row>
 531                     <row>
 532                         <entry align="left">
 533                             <constant>GL_UNSIGNED_INT_SAMPLER_1D_ARRAY</constant>
 534                         </entry>
 535                         <entry align="left">
 536                             <constant>usampler2DArray</constant>
 537                         </entry>
 538                     </row>
 539                     <row>
 540                         <entry align="left">
 541                             <constant>GL_UNSIGNED_INT_SAMPLER_2D_ARRAY</constant>
 542                         </entry>
 543                         <entry align="left">
 544                             <constant>usampler2DArray</constant>
 545                         </entry>
 546                     </row>
 547                     <row>
 548                         <entry align="left">
 549                             <constant>GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE</constant>
 550                         </entry>
 551                         <entry align="left">
 552                             <constant>usampler2DMS</constant>
 553                         </entry>
 554                     </row>
 555                     <row>
 556                         <entry align="left">
 557                             <constant>GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE_ARRAY</constant>
 558                         </entry>
 559                         <entry align="left">
 560                             <constant>usampler2DMSArray</constant>
 561                         </entry>
 562                     </row>
 563                     <row>
 564                         <entry align="left">
 565                             <constant>GL_UNSIGNED_INT_SAMPLER_BUFFER</constant>
 566                         </entry>
 567                         <entry align="left">
 568                             <constant>usamplerBuffer</constant>
 569                         </entry>
 570                     </row>
 571                     <row>
 572                         <entry align="left">
 573                             <constant>GL_UNSIGNED_INT_SAMPLER_2D_RECT</constant>
 574                         </entry>
 575                         <entry align="left">
 576                             <constant>usampler2DRect</constant>
 577                         </entry>
 578                     </row>
 579                 </tbody>
 580             </tgroup>
 581         </informaltable>
 582         </para>
 583         <para>
 584             If <parameter>pname</parameter> is <constant>GL_UNIFORM_SIZE</constant>, then an array identifying the
 585             size of the uniforms specified by the corresponding array of <parameter>uniformIndices</parameter> is
 586             returned. The sizes returned are in units of the type returned by a query of <constant>GL_UNIFORM_TYPE</constant>.
 587             For active uniforms that are arrays, the size is the number of active elements in the array;
 588             for all other uniforms, the size is one.
 589         </para>
 590         <para>
 591             If <parameter>pname</parameter> is <constant>GL_UNIFORM_NAME_LENGTH</constant>, then an array identifying the
 592             length, including the terminating null character, of the uniform name strings specified by the corresponding
 593             array of <parameter>uniformIndices</parameter> is returned.
 594         </para>
 595         <para>
 596             If <parameter>pname</parameter> is <constant>GL_UNIFORM_BLOCK_INDEX</constant>, then an array identifying the
 597             the uniform block index of each of the uniforms specified by the corresponding array of <parameter>uniformIndices</parameter>
 598             is returned. The uniform block index of a uniform associated with the default uniform block is -1.
 599         </para>
 600         <para>
 601             If <parameter>pname</parameter> is <constant>GL_UNIFORM_OFFSET</constant>, then an array of uniform buffer
 602             offsets is returned. For uniforms in a named uniform block, the returned value will be its offset, in basic
 603             machine units, relative to the beginning of the uniform block in the buffer object data store. For uniforms
 604             in the default uniform block, -1 will be returned.
 605         </para>
 606         <para>
 607             If <parameter>pname</parameter> is <constant>GL_UNIFORM_ARRAY_STRIDE</constant>, then an array identifying the
 608             stride between elements, in basic machine units, of each of the uniforms specified by the corresponding array of
 609             <parameter>uniformIndices</parameter> is returned.  The stride of a uniform associated with the default uniform
 610             block is -1.  Note that this information only makes sense for uniforms that are arrays. For uniforms that are
 611             not arrays, but are declared in a named uniform block, an array stride of zero is returned.
 612         </para>
 613         <para>
 614             If <parameter>pname</parameter> is <constant>GL_UNIFORM_MATRIX_STRIDE</constant>, then an array identifying the stride
 615             between columns of a column-major matrix or rows of a row-major matrix, in basic machine units, of each of the uniforms
 616             specified by the corresponding array of <parameter>uniformIndices</parameter> is returned. The matrix stride of a
 617             uniform associated with the default uniform block is -1. Note that this information only makes sense for uniforms
 618             that are matrices. For uniforms that are not matrices, but are declared in a named uniform block, a matrix stride of
 619             zero is returned.
 620         </para>
 621         <para>
 622             If <parameter>pname</parameter> is <constant>GL_UNIFORM_IS_ROW_MAJOR</constant>, then an array identifying whether each
 623             of the uniforms specified by the corresponding array of <parameter>uniformIndices</parameter> is a row-major matrix or not is returned. A
 624             value of one indicates a row-major matrix, and a value of zero indicates a column-major matrix, a matrix in the default
 625             uniform block, or a non-matrix.
 626         </para>
 627     </refsect1>
 628     <refsect1 id="errors"><title>Errors</title>
 629     <para><constant>GL_INVALID_VALUE</constant> is generated if
 630     <parameter>program</parameter> is not a value generated by
 631     OpenGL.</para>
 632
 633     <para><constant>GL_INVALID_OPERATION</constant> is generated if
 634     <parameter>program</parameter> is not a program object.</para>
 635
 636     <para><constant>GL_INVALID_VALUE</constant> is generated if
 637     <parameter>uniformCount</parameter> is greater than or equal to the
 638     value of <constant>GL_ACTIVE_UNIFORMS</constant> for
 639     <parameter>program</parameter>.</para>
 640
 641     <para><constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter>
 642     is not an accepted token.</para>
 643     </refsect1>
 644     <refsect1 id="associatedgets"><title>Associated Gets</title>
 645     <para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
 646     with argument <constant>GL_MAX_VERTEX_UNIFORM_COMPONENTS</constant>,
 647     <constant>GL_MAX_GEOMETRY_UNIFORM_COMPONENTS</constant>,
 648     <constant>GL_MAX_FRAGMENT_UNIFORM_COMPONENTS</constant>, or
 649     <constant>GL_MAX_COMBINED_UNIFORM_COMPONENTS</constant>.</para>
 650
 651     <para><citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
 652     with argument <constant>GL_ACTIVE_UNIFORMS</constant> or
 653     <constant>GL_ACTIVE_UNIFORM_MAX_LENGTH</constant>.</para>
 654
 655     <para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry></para>
 656     </refsect1>
 657     <refsect1 id="seealso"><title>See Also</title>
 658     <para><citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry>,
 659     <citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>,
 660     <citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>,
 661     <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,
 662     <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>,
 663     <citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry></para>
 664     </refsect1>
 665     <refsect1 id="Copyright"><title>Copyright</title>
 666         <para>
 667             Copyright <trademark class="copyright"></trademark> 2011 Khronos Group
 668             This material may be distributed subject to the terms and conditions set forth in
 669             the Open Publication License, v 1.0, 8 June 1999.
 670             <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
 671         </para>
 672     </refsect1>
 673 </refentry>