src/mesa/main/shaderapi.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2004-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2009-2010  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file shaderapi.c
  27  * \author Brian Paul
  28  *
  29  * Implementation of GLSL-related API functions.
  30  * The glUniform* functions are in uniforms.c
  31  *
  32  *
  33  * XXX things to do:
  34  * 1. Check that the right error code is generated for all _mesa_error() calls.
  35  * 2. Insert FLUSH_VERTICES calls in various places
  36  */
  37
  38
  39 #include "main/glheader.h"
  40 #include "main/context.h"
  41 #include "main/dispatch.h"
  42 #include "main/enums.h"
  43 #include "main/hash.h"
  44 #include "main/mfeatures.h"
  45 #include "main/mtypes.h"
  46 #include "main/shaderapi.h"
  47 #include "main/shaderobj.h"
  48 #include "main/uniforms.h"
  49 #include "program/program.h"
  50 #include "program/prog_parameter.h"
  51 #include "ralloc.h"
  52 #include <stdbool.h>
  53 #include "../glsl/glsl_parser_extras.h"
  54 #include "../glsl/ir_uniform.h"
  55
  56 /** Define this to enable shader substitution (see below) */
  57 #define SHADER_SUBST 0
  58
  59
  60 /**
  61  * Return mask of GLSL_x flags by examining the MESA_GLSL env var.
  62  */
  63 static GLbitfield
  64 get_shader_flags(void)
  65 {
  66    GLbitfield flags = 0x0;
  67    const char *env = _mesa_getenv("MESA_GLSL");
  68
  69    if (env) {
  70       if (strstr(env, "dump"))
  71          flags |= GLSL_DUMP;
  72       if (strstr(env, "log"))
  73          flags |= GLSL_LOG;
  74       if (strstr(env, "nopvert"))
  75          flags |= GLSL_NOP_VERT;
  76       if (strstr(env, "nopfrag"))
  77          flags |= GLSL_NOP_FRAG;
  78       if (strstr(env, "nopt"))
  79          flags |= GLSL_NO_OPT;
  80       else if (strstr(env, "opt"))
  81          flags |= GLSL_OPT;
  82       if (strstr(env, "uniform"))
  83          flags |= GLSL_UNIFORMS;
  84       if (strstr(env, "useprog"))
  85          flags |= GLSL_USE_PROG;
  86    }
  87
  88    return flags;
  89 }
  90
  91
  92 /**
  93  * Initialize context's shader state.
  94  */
  95 void
  96 _mesa_init_shader_state(struct gl_context *ctx)
  97 {
  98    /* Device drivers may override these to control what kind of instructions
  99     * are generated by the GLSL compiler.
 100     */
 101    struct gl_shader_compiler_options options;
 102    gl_shader_type sh;
 103
 104    memset(&options, 0, sizeof(options));
 105    options.MaxUnrollIterations = 32;
 106
 107    /* Default pragma settings */
 108    options.DefaultPragmas.Optimize = GL_TRUE;
 109
 110    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh)
 111       memcpy(&ctx->ShaderCompilerOptions[sh], &options, sizeof(options));
 112
 113    ctx->Shader.Flags = get_shader_flags();
 114 }
 115
 116
 117 /**
 118  * Free the per-context shader-related state.
 119  */
 120 void
 121 _mesa_free_shader_state(struct gl_context *ctx)
 122 {
 123    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentVertexProgram, NULL);
 124    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentGeometryProgram,
 125                                   NULL);
 126    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentFragmentProgram,
 127                                   NULL);
 128    _mesa_reference_shader_program(ctx, &ctx->Shader._CurrentFragmentProgram,
 129                                   NULL);
 130    _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, NULL);
 131 }
 132
 133
 134 /**
 135  * Return the size of the given GLSL datatype, in floats (components).
 136  */
 137 GLint
 138 _mesa_sizeof_glsl_type(GLenum type)
 139 {
 140    switch (type) {
 141    case GL_FLOAT:
 142    case GL_INT:
 143    case GL_UNSIGNED_INT:
 144    case GL_BOOL:
 145    case GL_SAMPLER_1D:
 146    case GL_SAMPLER_2D:
 147    case GL_SAMPLER_3D:
 148    case GL_SAMPLER_CUBE:
 149    case GL_SAMPLER_1D_SHADOW:
 150    case GL_SAMPLER_2D_SHADOW:
 151    case GL_SAMPLER_2D_RECT_ARB:
 152    case GL_SAMPLER_2D_RECT_SHADOW_ARB:
 153    case GL_SAMPLER_1D_ARRAY_EXT:
 154    case GL_SAMPLER_2D_ARRAY_EXT:
 155    case GL_SAMPLER_1D_ARRAY_SHADOW_EXT:
 156    case GL_SAMPLER_2D_ARRAY_SHADOW_EXT:
 157    case GL_SAMPLER_CUBE_SHADOW_EXT:
 158    case GL_SAMPLER_EXTERNAL_OES:
 159       return 1;
 160    case GL_FLOAT_VEC2:
 161    case GL_INT_VEC2:
 162    case GL_UNSIGNED_INT_VEC2:
 163    case GL_BOOL_VEC2:
 164       return 2;
 165    case GL_FLOAT_VEC3:
 166    case GL_INT_VEC3:
 167    case GL_UNSIGNED_INT_VEC3:
 168    case GL_BOOL_VEC3:
 169       return 3;
 170    case GL_FLOAT_VEC4:
 171    case GL_INT_VEC4:
 172    case GL_UNSIGNED_INT_VEC4:
 173    case GL_BOOL_VEC4:
 174       return 4;
 175    case GL_FLOAT_MAT2:
 176    case GL_FLOAT_MAT2x3:
 177    case GL_FLOAT_MAT2x4:
 178       return 8; /* two float[4] vectors */
 179    case GL_FLOAT_MAT3:
 180    case GL_FLOAT_MAT3x2:
 181    case GL_FLOAT_MAT3x4:
 182       return 12; /* three float[4] vectors */
 183    case GL_FLOAT_MAT4:
 184    case GL_FLOAT_MAT4x2:
 185    case GL_FLOAT_MAT4x3:
 186       return 16;  /* four float[4] vectors */
 187    default:
 188       _mesa_problem(NULL, "Invalid type in _mesa_sizeof_glsl_type()");
 189       return 1;
 190    }
 191 }
 192
 193
 194 /**
 195  * Copy string from <src> to <dst>, up to maxLength characters, returning
 196  * length of <dst> in <length>.
 197  * \param src  the strings source
 198  * \param maxLength  max chars to copy
 199  * \param length  returns number of chars copied
 200  * \param dst  the string destination
 201  */
 202 void
 203 _mesa_copy_string(GLchar *dst, GLsizei maxLength,
 204                   GLsizei *length, const GLchar *src)
 205 {
 206    GLsizei len;
 207    for (len = 0; len < maxLength - 1 && src && src[len]; len++)
 208       dst[len] = src[len];
 209    if (maxLength > 0)
 210       dst[len] = 0;
 211    if (length)
 212       *length = len;
 213 }
 214
 215
 216
 217 /**
 218  * Confirm that the a shader type is valid and supported by the implementation
 219  *
 220  * \param ctx   Current GL context
 221  * \param type  Shader target
 222  *
 223  */
 224 static bool
 225 validate_shader_target(const struct gl_context *ctx, GLenum type)
 226 {
 227    switch (type) {
 228 #if FEATURE_ARB_fragment_shader
 229    case GL_FRAGMENT_SHADER:
 230       return ctx->Extensions.ARB_fragment_shader;
 231 #endif
 232 #if FEATURE_ARB_vertex_shader
 233    case GL_VERTEX_SHADER:
 234       return ctx->Extensions.ARB_vertex_shader;
 235 #endif
 236 #if FEATURE_ARB_geometry_shader4
 237    case GL_GEOMETRY_SHADER_ARB:
 238       return ctx->Extensions.ARB_geometry_shader4;
 239 #endif
 240    default:
 241       return false;
 242    }
 243 }
 244
 245
 246 /**
 247  * Find the length of the longest transform feedback varying name
 248  * which was specified with glTransformFeedbackVaryings().
 249  */
 250 static GLint
 251 longest_feedback_varying_name(const struct gl_shader_program *shProg)
 252 {
 253    GLuint i;
 254    GLint max = 0;
 255    for (i = 0; i < shProg->TransformFeedback.NumVarying; i++) {
 256       GLint len = strlen(shProg->TransformFeedback.VaryingNames[i]);
 257       if (len > max)
 258          max = len;
 259    }
 260    return max;
 261 }
 262
 263
 264
 265 static GLboolean
 266 is_program(struct gl_context *ctx, GLuint name)
 267 {
 268    struct gl_shader_program *shProg = _mesa_lookup_shader_program(ctx, name);
 269    return shProg ? GL_TRUE : GL_FALSE;
 270 }
 271
 272
 273 static GLboolean
 274 is_shader(struct gl_context *ctx, GLuint name)
 275 {
 276    struct gl_shader *shader = _mesa_lookup_shader(ctx, name);
 277    return shader ? GL_TRUE : GL_FALSE;
 278 }
 279
 280
 281 /**
 282  * Attach shader to a shader program.
 283  */
 284 static void
 285 attach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
 286 {
 287    struct gl_shader_program *shProg;
 288    struct gl_shader *sh;
 289    GLuint i, n;
 290
 291    shProg = _mesa_lookup_shader_program_err(ctx, program, "glAttachShader");
 292    if (!shProg)
 293       return;
 294
 295    sh = _mesa_lookup_shader_err(ctx, shader, "glAttachShader");
 296    if (!sh) {
 297       return;
 298    }
 299
 300    n = shProg->NumShaders;
 301    for (i = 0; i < n; i++) {
 302       if (shProg->Shaders[i] == sh) {
 303          /* The shader is already attched to this program.  The
 304           * GL_ARB_shader_objects spec says:
 305           *
 306           *     "The error INVALID_OPERATION is generated by AttachObjectARB
 307           *     if <obj> is already attached to <containerObj>."
 308           */
 309          _mesa_error(ctx, GL_INVALID_OPERATION, "glAttachShader");
 310          return;
 311       }
 312    }
 313
 314    /* grow list */
 315    shProg->Shaders = (struct gl_shader **)
 316       _mesa_realloc(shProg->Shaders,
 317                     n * sizeof(struct gl_shader *),
 318                     (n + 1) * sizeof(struct gl_shader *));
 319    if (!shProg->Shaders) {
 320       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAttachShader");
 321       return;
 322    }
 323
 324    /* append */
 325    shProg->Shaders[n] = NULL; /* since realloc() didn't zero the new space */
 326    _mesa_reference_shader(ctx, &shProg->Shaders[n], sh);
 327    shProg->NumShaders++;
 328 }
 329
 330
 331 static GLuint
 332 create_shader(struct gl_context *ctx, GLenum type)
 333 {
 334    struct gl_shader *sh;
 335    GLuint name;
 336
 337    if (!validate_shader_target(ctx, type)) {
 338       _mesa_error(ctx, GL_INVALID_ENUM, "CreateShader(type)");
 339       return 0;
 340    }
 341
 342    name = _mesa_HashFindFreeKeyBlock(ctx->Shared->ShaderObjects, 1);
 343    sh = ctx->Driver.NewShader(ctx, name, type);
 344    _mesa_HashInsert(ctx->Shared->ShaderObjects, name, sh);
 345
 346    return name;
 347 }
 348
 349
 350 static GLuint
 351 create_shader_program(struct gl_context *ctx)
 352 {
 353    GLuint name;
 354    struct gl_shader_program *shProg;
 355
 356    name = _mesa_HashFindFreeKeyBlock(ctx->Shared->ShaderObjects, 1);
 357
 358    shProg = ctx->Driver.NewShaderProgram(ctx, name);
 359
 360    _mesa_HashInsert(ctx->Shared->ShaderObjects, name, shProg);
 361
 362    assert(shProg->RefCount == 1);
 363
 364    return name;
 365 }
 366
 367
 368 /**
 369  * Named w/ "2" to indicate OpenGL 2.x vs GL_ARB_fragment_programs's
 370  * DeleteProgramARB.
 371  */
 372 static void
 373 delete_shader_program(struct gl_context *ctx, GLuint name)
 374 {
 375    /*
 376     * NOTE: deleting shaders/programs works a bit differently than
 377     * texture objects (and buffer objects, etc).  Shader/program
 378     * handles/IDs exist in the hash table until the object is really
 379     * deleted (refcount==0).  With texture objects, the handle/ID is
 380     * removed from the hash table in glDeleteTextures() while the tex
 381     * object itself might linger until its refcount goes to zero.
 382     */
 383    struct gl_shader_program *shProg;
 384
 385    shProg = _mesa_lookup_shader_program_err(ctx, name, "glDeleteProgram");
 386    if (!shProg)
 387       return;
 388
 389    if (!shProg->DeletePending) {
 390       shProg->DeletePending = GL_TRUE;
 391
 392       /* effectively, decr shProg's refcount */
 393       _mesa_reference_shader_program(ctx, &shProg, NULL);
 394    }
 395 }
 396
 397
 398 static void
 399 delete_shader(struct gl_context *ctx, GLuint shader)
 400 {
 401    struct gl_shader *sh;
 402
 403    sh = _mesa_lookup_shader_err(ctx, shader, "glDeleteShader");
 404    if (!sh)
 405       return;
 406
 407    sh->DeletePending = GL_TRUE;
 408
 409    /* effectively, decr sh's refcount */
 410    _mesa_reference_shader(ctx, &sh, NULL);
 411 }
 412
 413
 414 static void
 415 detach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
 416 {
 417    struct gl_shader_program *shProg;
 418    GLuint n;
 419    GLuint i, j;
 420
 421    shProg = _mesa_lookup_shader_program_err(ctx, program, "glDetachShader");
 422    if (!shProg)
 423       return;
 424
 425    n = shProg->NumShaders;
 426
 427    for (i = 0; i < n; i++) {
 428       if (shProg->Shaders[i]->Name == shader) {
 429          /* found it */
 430          struct gl_shader **newList;
 431
 432          /* release */
 433          _mesa_reference_shader(ctx, &shProg->Shaders[i], NULL);
 434
 435          /* alloc new, smaller array */
 436          newList = (struct gl_shader **)
 437             malloc((n - 1) * sizeof(struct gl_shader *));
 438          if (!newList) {
 439             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDetachShader");
 440             return;
 441          }
 442          for (j = 0; j < i; j++) {
 443             newList[j] = shProg->Shaders[j];
 444          }
 445          while (++i < n)
 446             newList[j++] = shProg->Shaders[i];
 447          free(shProg->Shaders);
 448
 449          shProg->Shaders = newList;
 450          shProg->NumShaders = n - 1;
 451
 452 #ifdef DEBUG
 453          /* sanity check */
 454          {
 455             for (j = 0; j < shProg->NumShaders; j++) {
 456                assert(shProg->Shaders[j]->Type == GL_VERTEX_SHADER ||
 457                       shProg->Shaders[j]->Type == GL_FRAGMENT_SHADER);
 458                assert(shProg->Shaders[j]->RefCount > 0);
 459             }
 460          }
 461 #endif
 462
 463          return;
 464       }
 465    }
 466
 467    /* not found */
 468    {
 469       GLenum err;
 470       if (is_shader(ctx, shader))
 471          err = GL_INVALID_OPERATION;
 472       else if (is_program(ctx, shader))
 473          err = GL_INVALID_OPERATION;
 474       else
 475          err = GL_INVALID_VALUE;
 476       _mesa_error(ctx, err, "glDetachProgram(shader)");
 477       return;
 478    }
 479 }
 480
 481
 482 /**
 483  * Return list of shaders attached to shader program.
 484  */
 485 static void
 486 get_attached_shaders(struct gl_context *ctx, GLuint program, GLsizei maxCount,
 487                      GLsizei *count, GLuint *obj)
 488 {
 489    struct gl_shader_program *shProg =
 490       _mesa_lookup_shader_program_err(ctx, program, "glGetAttachedShaders");
 491    if (shProg) {
 492       GLuint i;
 493       for (i = 0; i < (GLuint) maxCount && i < shProg->NumShaders; i++) {
 494          obj[i] = shProg->Shaders[i]->Name;
 495       }
 496       if (count)
 497          *count = i;
 498    }
 499 }
 500
 501
 502 /**
 503  * glGetHandleARB() - return ID/name of currently bound shader program.
 504  */
 505 static GLuint
 506 get_handle(struct gl_context *ctx, GLenum pname)
 507 {
 508    if (pname == GL_PROGRAM_OBJECT_ARB) {
 509       if (ctx->Shader.ActiveProgram)
 510          return ctx->Shader.ActiveProgram->Name;
 511       else
 512          return 0;
 513    }
 514    else {
 515       _mesa_error(ctx, GL_INVALID_ENUM, "glGetHandleARB");
 516       return 0;
 517    }
 518 }
 519
 520
 521 /**
 522  * glGetProgramiv() - get shader program state.
 523  * Note that this is for GLSL shader programs, not ARB vertex/fragment
 524  * programs (see glGetProgramivARB).
 525  */
 526 static void
 527 get_programiv(struct gl_context *ctx, GLuint program, GLenum pname, GLint *params)
 528 {
 529    struct gl_shader_program *shProg
 530       = _mesa_lookup_shader_program(ctx, program);
 531
 532    if (!shProg) {
 533       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramiv(program)");
 534       return;
 535    }
 536
 537    switch (pname) {
 538    case GL_DELETE_STATUS:
 539       *params = shProg->DeletePending;
 540       break;
 541    case GL_LINK_STATUS:
 542       *params = shProg->LinkStatus;
 543       break;
 544    case GL_VALIDATE_STATUS:
 545       *params = shProg->Validated;
 546       break;
 547    case GL_INFO_LOG_LENGTH:
 548       *params = shProg->InfoLog ? strlen(shProg->InfoLog) + 1 : 0;
 549       break;
 550    case GL_ATTACHED_SHADERS:
 551       *params = shProg->NumShaders;
 552       break;
 553    case GL_ACTIVE_ATTRIBUTES:
 554       *params = _mesa_count_active_attribs(shProg);
 555       break;
 556    case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
 557       *params = _mesa_longest_attribute_name_length(shProg);
 558       break;
 559    case GL_ACTIVE_UNIFORMS:
 560       *params = shProg->NumUserUniformStorage;
 561       break;
 562    case GL_ACTIVE_UNIFORM_MAX_LENGTH: {
 563       unsigned i;
 564       GLint max_len = 0;
 565
 566       for (i = 0; i < shProg->NumUserUniformStorage; i++) {
 567          /* Add one for the terminating NUL character.
 568           */
 569          const GLint len = strlen(shProg->UniformStorage[i].name) + 1;
 570
 571          if (len > max_len)
 572             max_len = len;
 573       }
 574
 575       *params = max_len;
 576       break;
 577    }
 578    case GL_PROGRAM_BINARY_LENGTH_OES:
 579       *params = 0;
 580       break;
 581 #if FEATURE_EXT_transform_feedback
 582    case GL_TRANSFORM_FEEDBACK_VARYINGS:
 583       *params = shProg->TransformFeedback.NumVarying;
 584       break;
 585    case GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH:
 586       *params = longest_feedback_varying_name(shProg) + 1;
 587       break;
 588    case GL_TRANSFORM_FEEDBACK_BUFFER_MODE:
 589       *params = shProg->TransformFeedback.BufferMode;
 590       break;
 591 #endif
 592 #if FEATURE_ARB_geometry_shader4
 593    case GL_GEOMETRY_VERTICES_OUT_ARB:
 594       *params = shProg->Geom.VerticesOut;
 595       break;
 596    case GL_GEOMETRY_INPUT_TYPE_ARB:
 597       *params = shProg->Geom.InputType;
 598       break;
 599    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
 600       *params = shProg->Geom.OutputType;
 601       break;
 602 #endif
 603    default:
 604       _mesa_error(ctx, GL_INVALID_ENUM, "glGetProgramiv(pname)");
 605       return;
 606    }
 607 }
 608
 609
 610 /**
 611  * glGetShaderiv() - get GLSL shader state
 612  */
 613 static void
 614 get_shaderiv(struct gl_context *ctx, GLuint name, GLenum pname, GLint *params)
 615 {
 616    struct gl_shader *shader =
 617       _mesa_lookup_shader_err(ctx, name, "glGetShaderiv");
 618
 619    if (!shader) {
 620       return;
 621    }
 622
 623    switch (pname) {
 624    case GL_SHADER_TYPE:
 625       *params = shader->Type;
 626       break;
 627    case GL_DELETE_STATUS:
 628       *params = shader->DeletePending;
 629       break;
 630    case GL_COMPILE_STATUS:
 631       *params = shader->CompileStatus;
 632       break;
 633    case GL_INFO_LOG_LENGTH:
 634       *params = shader->InfoLog ? strlen(shader->InfoLog) + 1 : 0;
 635       break;
 636    case GL_SHADER_SOURCE_LENGTH:
 637       *params = shader->Source ? strlen((char *) shader->Source) + 1 : 0;
 638       break;
 639    default:
 640       _mesa_error(ctx, GL_INVALID_ENUM, "glGetShaderiv(pname)");
 641       return;
 642    }
 643 }
 644
 645
 646 static void
 647 get_program_info_log(struct gl_context *ctx, GLuint program, GLsizei bufSize,
 648                      GLsizei *length, GLchar *infoLog)
 649 {
 650    struct gl_shader_program *shProg
 651       = _mesa_lookup_shader_program(ctx, program);
 652    if (!shProg) {
 653       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramInfoLog(program)");
 654       return;
 655    }
 656    _mesa_copy_string(infoLog, bufSize, length, shProg->InfoLog);
 657 }
 658
 659
 660 static void
 661 get_shader_info_log(struct gl_context *ctx, GLuint shader, GLsizei bufSize,
 662                     GLsizei *length, GLchar *infoLog)
 663 {
 664    struct gl_shader *sh = _mesa_lookup_shader(ctx, shader);
 665    if (!sh) {
 666       _mesa_error(ctx, GL_INVALID_VALUE, "glGetShaderInfoLog(shader)");
 667       return;
 668    }
 669    _mesa_copy_string(infoLog, bufSize, length, sh->InfoLog);
 670 }
 671
 672
 673 /**
 674  * Return shader source code.
 675  */
 676 static void
 677 get_shader_source(struct gl_context *ctx, GLuint shader, GLsizei maxLength,
 678                   GLsizei *length, GLchar *sourceOut)
 679 {
 680    struct gl_shader *sh;
 681    sh = _mesa_lookup_shader_err(ctx, shader, "glGetShaderSource");
 682    if (!sh) {
 683       return;
 684    }
 685    _mesa_copy_string(sourceOut, maxLength, length, sh->Source);
 686 }
 687
 688
 689 /**
 690  * Set/replace shader source code.
 691  */
 692 static void
 693 shader_source(struct gl_context *ctx, GLuint shader, const GLchar *source)
 694 {
 695    struct gl_shader *sh;
 696
 697    sh = _mesa_lookup_shader_err(ctx, shader, "glShaderSource");
 698    if (!sh)
 699       return;
 700
 701    /* free old shader source string and install new one */
 702    if (sh->Source) {
 703       free((void *) sh->Source);
 704    }
 705    sh->Source = source;
 706    sh->CompileStatus = GL_FALSE;
 707 #ifdef DEBUG
 708    sh->SourceChecksum = _mesa_str_checksum(sh->Source);
 709 #endif
 710 }
 711
 712
 713 /**
 714  * Compile a shader.
 715  */
 716 static void
 717 compile_shader(struct gl_context *ctx, GLuint shaderObj)
 718 {
 719    struct gl_shader *sh;
 720    struct gl_shader_compiler_options *options;
 721
 722    sh = _mesa_lookup_shader_err(ctx, shaderObj, "glCompileShader");
 723    if (!sh)
 724       return;
 725
 726    options = &ctx->ShaderCompilerOptions[_mesa_shader_type_to_index(sh->Type)];
 727
 728    /* set default pragma state for shader */
 729    sh->Pragmas = options->DefaultPragmas;
 730
 731    /* this call will set the sh->CompileStatus field to indicate if
 732     * compilation was successful.
 733     */
 734    _mesa_glsl_compile_shader(ctx, sh);
 735 }
 736
 737
 738 /**
 739  * Link a program's shaders.
 740  */
 741 static void
 742 link_program(struct gl_context *ctx, GLuint program)
 743 {
 744    struct gl_shader_program *shProg;
 745    struct gl_transform_feedback_object *obj =
 746       ctx->TransformFeedback.CurrentObject;
 747
 748    shProg = _mesa_lookup_shader_program_err(ctx, program, "glLinkProgram");
 749    if (!shProg)
 750       return;
 751
 752    if (obj->Active
 753        && (shProg == ctx->Shader.CurrentVertexProgram
 754            || shProg == ctx->Shader.CurrentGeometryProgram
 755            || shProg == ctx->Shader.CurrentFragmentProgram)) {
 756       _mesa_error(ctx, GL_INVALID_OPERATION,
 757                   "glLinkProgram(transform feedback active)");
 758       return;
 759    }
 760
 761    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 762
 763    _mesa_glsl_link_shader(ctx, shProg);
 764
 765    /* debug code */
 766    if (0) {
 767       GLuint i;
 768
 769       printf("Link %u shaders in program %u: %s\n",
 770                    shProg->NumShaders, shProg->Name,
 771                    shProg->LinkStatus ? "Success" : "Failed");
 772
 773       for (i = 0; i < shProg->NumShaders; i++) {
 774          printf(" shader %u, type 0x%x\n",
 775                       shProg->Shaders[i]->Name,
 776                       shProg->Shaders[i]->Type);
 777       }
 778    }
 779 }
 780
 781
 782 /**
 783  * Print basic shader info (for debug).
 784  */
 785 static void
 786 print_shader_info(const struct gl_shader_program *shProg)
 787 {
 788    GLuint i;
 789
 790    printf("Mesa: glUseProgram(%u)\n", shProg->Name);
 791    for (i = 0; i < shProg->NumShaders; i++) {
 792       const char *s;
 793       switch (shProg->Shaders[i]->Type) {
 794       case GL_VERTEX_SHADER:
 795          s = "vertex";
 796          break;
 797       case GL_FRAGMENT_SHADER:
 798          s = "fragment";
 799          break;
 800       case GL_GEOMETRY_SHADER:
 801          s = "geometry";
 802          break;
 803       default:
 804          s = "";
 805       }
 806       printf("  %s shader %u, checksum %u\n", s,
 807              shProg->Shaders[i]->Name,
 808              shProg->Shaders[i]->SourceChecksum);
 809    }
 810    if (shProg->_LinkedShaders[MESA_SHADER_VERTEX])
 811       printf("  vert prog %u\n",
 812              shProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program->Id);
 813    if (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT])
 814       printf("  frag prog %u\n",
 815              shProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program->Id);
 816    if (shProg->_LinkedShaders[MESA_SHADER_GEOMETRY])
 817       printf("  geom prog %u\n",
 818              shProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program->Id);
 819 }
 820
 821
 822 /**
 823  * Use the named shader program for subsequent glUniform calls
 824  */
 825 void
 826 _mesa_active_program(struct gl_context *ctx, struct gl_shader_program *shProg,
 827                      const char *caller)
 828 {
 829    if ((shProg != NULL) && !shProg->LinkStatus) {
 830       _mesa_error(ctx, GL_INVALID_OPERATION,
 831                   "%s(program %u not linked)", caller, shProg->Name);
 832       return;
 833    }
 834
 835    if (ctx->Shader.ActiveProgram != shProg) {
 836       _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, shProg);
 837    }
 838 }
 839
 840 /**
 841  */
 842 static bool
 843 use_shader_program(struct gl_context *ctx, GLenum type,
 844                    struct gl_shader_program *shProg)
 845 {
 846    struct gl_shader_program **target;
 847
 848    switch (type) {
 849 #if FEATURE_ARB_vertex_shader
 850    case GL_VERTEX_SHADER:
 851       target = &ctx->Shader.CurrentVertexProgram;
 852       if ((shProg == NULL)
 853           || (shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL)) {
 854          shProg = NULL;
 855       }
 856       break;
 857 #endif
 858 #if FEATURE_ARB_geometry_shader4
 859    case GL_GEOMETRY_SHADER_ARB:
 860       target = &ctx->Shader.CurrentGeometryProgram;
 861       if ((shProg == NULL)
 862           || (shProg->_LinkedShaders[MESA_SHADER_GEOMETRY] == NULL)) {
 863          shProg = NULL;
 864       }
 865       break;
 866 #endif
 867 #if FEATURE_ARB_fragment_shader
 868    case GL_FRAGMENT_SHADER:
 869       target = &ctx->Shader.CurrentFragmentProgram;
 870       if ((shProg == NULL)
 871           || (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL)) {
 872          shProg = NULL;
 873       }
 874       break;
 875 #endif
 876    default:
 877       return false;
 878    }
 879
 880    if (*target != shProg) {
 881       FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
 882
 883       /* If the shader is also bound as the current rendering shader, unbind
 884        * it from that binding point as well.  This ensures that the correct
 885        * semantics of glDeleteProgram are maintained.
 886        */
 887       switch (type) {
 888 #if FEATURE_ARB_vertex_shader
 889       case GL_VERTEX_SHADER:
 890          /* Empty for now. */
 891          break;
 892 #endif
 893 #if FEATURE_ARB_geometry_shader4
 894       case GL_GEOMETRY_SHADER_ARB:
 895          /* Empty for now. */
 896          break;
 897 #endif
 898 #if FEATURE_ARB_fragment_shader
 899       case GL_FRAGMENT_SHADER:
 900          if (*target == ctx->Shader._CurrentFragmentProgram) {
 901             _mesa_reference_shader_program(ctx,
 902                                            &ctx->Shader._CurrentFragmentProgram,
 903                                            NULL);
 904          }
 905          break;
 906 #endif
 907       }
 908
 909       _mesa_reference_shader_program(ctx, target, shProg);
 910       return true;
 911    }
 912
 913    return false;
 914 }
 915
 916 /**
 917  * Use the named shader program for subsequent rendering.
 918  */
 919 void
 920 _mesa_use_program(struct gl_context *ctx, struct gl_shader_program *shProg)
 921 {
 922    use_shader_program(ctx, GL_VERTEX_SHADER, shProg);
 923    use_shader_program(ctx, GL_GEOMETRY_SHADER_ARB, shProg);
 924    use_shader_program(ctx, GL_FRAGMENT_SHADER, shProg);
 925    _mesa_active_program(ctx, shProg, "glUseProgram");
 926
 927    if (ctx->Driver.UseProgram)
 928       ctx->Driver.UseProgram(ctx, shProg);
 929 }
 930
 931 /**
 932  * Do validation of the given shader program.
 933  * \param errMsg  returns error message if validation fails.
 934  * \return GL_TRUE if valid, GL_FALSE if invalid (and set errMsg)
 935  */
 936 static GLboolean
 937 validate_shader_program(const struct gl_shader_program *shProg,
 938                         char *errMsg)
 939 {
 940    if (!shProg->LinkStatus) {
 941       return GL_FALSE;
 942    }
 943
 944    /* From the GL spec, a program is invalid if any of these are true:
 945
 946      any two active samplers in the current program object are of
 947      different types, but refer to the same texture image unit,
 948
 949      any active sampler in the current program object refers to a texture
 950      image unit where fixed-function fragment processing accesses a
 951      texture target that does not match the sampler type, or
 952
 953      the sum of the number of active samplers in the program and the
 954      number of texture image units enabled for fixed-function fragment
 955      processing exceeds the combined limit on the total number of texture
 956      image units allowed.
 957    */
 958
 959
 960    /*
 961     * Check: any two active samplers in the current program object are of
 962     * different types, but refer to the same texture image unit,
 963     */
 964    if (!_mesa_sampler_uniforms_are_valid(shProg, errMsg, 100))
 965       return GL_FALSE;
 966
 967    return GL_TRUE;
 968 }
 969
 970
 971 /**
 972  * Called via glValidateProgram()
 973  */
 974 static void
 975 validate_program(struct gl_context *ctx, GLuint program)
 976 {
 977    struct gl_shader_program *shProg;
 978    char errMsg[100] = "";
 979
 980    shProg = _mesa_lookup_shader_program_err(ctx, program, "glValidateProgram");
 981    if (!shProg) {
 982       return;
 983    }
 984
 985    shProg->Validated = validate_shader_program(shProg, errMsg);
 986    if (!shProg->Validated) {
 987       /* update info log */
 988       if (shProg->InfoLog) {
 989          ralloc_free(shProg->InfoLog);
 990       }
 991       shProg->InfoLog = ralloc_strdup(shProg, errMsg);
 992    }
 993 }
 994
 995
 996
 997 void GLAPIENTRY
 998 _mesa_AttachObjectARB(GLhandleARB program, GLhandleARB shader)
 999 {
1000    GET_CURRENT_CONTEXT(ctx);
1001    attach_shader(ctx, program, shader);
1002 }
1003
1004
1005 void GLAPIENTRY
1006 _mesa_AttachShader(GLuint program, GLuint shader)
1007 {
1008    GET_CURRENT_CONTEXT(ctx);
1009    attach_shader(ctx, program, shader);
1010 }
1011
1012
1013 void GLAPIENTRY
1014 _mesa_CompileShaderARB(GLhandleARB shaderObj)
1015 {
1016    GET_CURRENT_CONTEXT(ctx);
1017    if (MESA_VERBOSE & VERBOSE_API)
1018       _mesa_debug(ctx, "glCompileShader %u\n", shaderObj);
1019    compile_shader(ctx, shaderObj);
1020 }
1021
1022
1023 GLuint GLAPIENTRY
1024 _mesa_CreateShader(GLenum type)
1025 {
1026    GET_CURRENT_CONTEXT(ctx);
1027    if (MESA_VERBOSE & VERBOSE_API)
1028       _mesa_debug(ctx, "glCreateShader %s\n", _mesa_lookup_enum_by_nr(type));
1029    return create_shader(ctx, type);
1030 }
1031
1032
1033 GLhandleARB GLAPIENTRY
1034 _mesa_CreateShaderObjectARB(GLenum type)
1035 {
1036    GET_CURRENT_CONTEXT(ctx);
1037    return create_shader(ctx, type);
1038 }
1039
1040
1041 GLuint GLAPIENTRY
1042 _mesa_CreateProgram(void)
1043 {
1044    GET_CURRENT_CONTEXT(ctx);
1045    if (MESA_VERBOSE & VERBOSE_API)
1046       _mesa_debug(ctx, "glCreateProgram\n");
1047    return create_shader_program(ctx);
1048 }
1049
1050
1051 GLhandleARB GLAPIENTRY
1052 _mesa_CreateProgramObjectARB(void)
1053 {
1054    GET_CURRENT_CONTEXT(ctx);
1055    return create_shader_program(ctx);
1056 }
1057
1058
1059 void GLAPIENTRY
1060 _mesa_DeleteObjectARB(GLhandleARB obj)
1061 {
1062    if (MESA_VERBOSE & VERBOSE_API) {
1063       GET_CURRENT_CONTEXT(ctx);
1064       _mesa_debug(ctx, "glDeleteObjectARB(%u)\n", obj);
1065    }
1066
1067    if (obj) {
1068       GET_CURRENT_CONTEXT(ctx);
1069       FLUSH_VERTICES(ctx, 0);
1070       if (is_program(ctx, obj)) {
1071          delete_shader_program(ctx, obj);
1072       }
1073       else if (is_shader(ctx, obj)) {
1074          delete_shader(ctx, obj);
1075       }
1076       else {
1077          /* error? */
1078       }
1079    }
1080 }
1081
1082
1083 void GLAPIENTRY
1084 _mesa_DeleteProgram(GLuint name)
1085 {
1086    if (name) {
1087       GET_CURRENT_CONTEXT(ctx);
1088       FLUSH_VERTICES(ctx, 0);
1089       delete_shader_program(ctx, name);
1090    }
1091 }
1092
1093
1094 void GLAPIENTRY
1095 _mesa_DeleteShader(GLuint name)
1096 {
1097    if (name) {
1098       GET_CURRENT_CONTEXT(ctx);
1099       FLUSH_VERTICES(ctx, 0);
1100       delete_shader(ctx, name);
1101    }
1102 }
1103
1104
1105 void GLAPIENTRY
1106 _mesa_DetachObjectARB(GLhandleARB program, GLhandleARB shader)
1107 {
1108    GET_CURRENT_CONTEXT(ctx);
1109    detach_shader(ctx, program, shader);
1110 }
1111
1112
1113 void GLAPIENTRY
1114 _mesa_DetachShader(GLuint program, GLuint shader)
1115 {
1116    GET_CURRENT_CONTEXT(ctx);
1117    detach_shader(ctx, program, shader);
1118 }
1119
1120
1121 void GLAPIENTRY
1122 _mesa_GetAttachedObjectsARB(GLhandleARB container, GLsizei maxCount,
1123                             GLsizei * count, GLhandleARB * obj)
1124 {
1125    GET_CURRENT_CONTEXT(ctx);
1126    get_attached_shaders(ctx, container, maxCount, count, obj);
1127 }
1128
1129
1130 void GLAPIENTRY
1131 _mesa_GetAttachedShaders(GLuint program, GLsizei maxCount,
1132                          GLsizei *count, GLuint *obj)
1133 {
1134    GET_CURRENT_CONTEXT(ctx);
1135    get_attached_shaders(ctx, program, maxCount, count, obj);
1136 }
1137
1138
1139 void GLAPIENTRY
1140 _mesa_GetInfoLogARB(GLhandleARB object, GLsizei maxLength, GLsizei * length,
1141                     GLcharARB * infoLog)
1142 {
1143    GET_CURRENT_CONTEXT(ctx);
1144    if (is_program(ctx, object)) {
1145       get_program_info_log(ctx, object, maxLength, length, infoLog);
1146    }
1147    else if (is_shader(ctx, object)) {
1148       get_shader_info_log(ctx, object, maxLength, length, infoLog);
1149    }
1150    else {
1151       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetInfoLogARB");
1152    }
1153 }
1154
1155
1156 void GLAPIENTRY
1157 _mesa_GetObjectParameterivARB(GLhandleARB object, GLenum pname, GLint *params)
1158 {
1159    GET_CURRENT_CONTEXT(ctx);
1160    /* Implement in terms of GetProgramiv, GetShaderiv */
1161    if (is_program(ctx, object)) {
1162       if (pname == GL_OBJECT_TYPE_ARB) {
1163          *params = GL_PROGRAM_OBJECT_ARB;
1164       }
1165       else {
1166          get_programiv(ctx, object, pname, params);
1167       }
1168    }
1169    else if (is_shader(ctx, object)) {
1170       if (pname == GL_OBJECT_TYPE_ARB) {
1171          *params = GL_SHADER_OBJECT_ARB;
1172       }
1173       else {
1174          get_shaderiv(ctx, object, pname, params);
1175       }
1176    }
1177    else {
1178       _mesa_error(ctx, GL_INVALID_VALUE, "glGetObjectParameterivARB");
1179    }
1180 }
1181
1182
1183 void GLAPIENTRY
1184 _mesa_GetObjectParameterfvARB(GLhandleARB object, GLenum pname,
1185                               GLfloat *params)
1186 {
1187    GLint iparams[1];  /* XXX is one element enough? */
1188    _mesa_GetObjectParameterivARB(object, pname, iparams);
1189    params[0] = (GLfloat) iparams[0];
1190 }
1191
1192
1193 void GLAPIENTRY
1194 _mesa_GetProgramiv(GLuint program, GLenum pname, GLint *params)
1195 {
1196    GET_CURRENT_CONTEXT(ctx);
1197    get_programiv(ctx, program, pname, params);
1198 }
1199
1200
1201 void GLAPIENTRY
1202 _mesa_GetShaderiv(GLuint shader, GLenum pname, GLint *params)
1203 {
1204    GET_CURRENT_CONTEXT(ctx);
1205    get_shaderiv(ctx, shader, pname, params);
1206 }
1207
1208
1209 void GLAPIENTRY
1210 _mesa_GetProgramInfoLog(GLuint program, GLsizei bufSize,
1211                         GLsizei *length, GLchar *infoLog)
1212 {
1213    GET_CURRENT_CONTEXT(ctx);
1214    get_program_info_log(ctx, program, bufSize, length, infoLog);
1215 }
1216
1217
1218 void GLAPIENTRY
1219 _mesa_GetShaderInfoLog(GLuint shader, GLsizei bufSize,
1220                        GLsizei *length, GLchar *infoLog)
1221 {
1222    GET_CURRENT_CONTEXT(ctx);
1223    get_shader_info_log(ctx, shader, bufSize, length, infoLog);
1224 }
1225
1226
1227 void GLAPIENTRY
1228 _mesa_GetShaderSourceARB(GLhandleARB shader, GLsizei maxLength,
1229                          GLsizei *length, GLcharARB *sourceOut)
1230 {
1231    GET_CURRENT_CONTEXT(ctx);
1232    get_shader_source(ctx, shader, maxLength, length, sourceOut);
1233 }
1234
1235
1236 GLhandleARB GLAPIENTRY
1237 _mesa_GetHandleARB(GLenum pname)
1238 {
1239    GET_CURRENT_CONTEXT(ctx);
1240    return get_handle(ctx, pname);
1241 }
1242
1243
1244 GLboolean GLAPIENTRY
1245 _mesa_IsProgram(GLuint name)
1246 {
1247    GET_CURRENT_CONTEXT(ctx);
1248    return is_program(ctx, name);
1249 }
1250
1251
1252 GLboolean GLAPIENTRY
1253 _mesa_IsShader(GLuint name)
1254 {
1255    GET_CURRENT_CONTEXT(ctx);
1256    return is_shader(ctx, name);
1257 }
1258
1259
1260 void GLAPIENTRY
1261 _mesa_LinkProgramARB(GLhandleARB programObj)
1262 {
1263    GET_CURRENT_CONTEXT(ctx);
1264    link_program(ctx, programObj);
1265 }
1266
1267
1268
1269 /**
1270  * Read shader source code from a file.
1271  * Useful for debugging to override an app's shader.
1272  */
1273 static GLcharARB *
1274 read_shader(const char *fname)
1275 {
1276    const int max = 50*1000;
1277    FILE *f = fopen(fname, "r");
1278    GLcharARB *buffer, *shader;
1279    int len;
1280
1281    if (!f) {
1282       return NULL;
1283    }
1284
1285    buffer = (char *) malloc(max);
1286    len = fread(buffer, 1, max, f);
1287    buffer[len] = 0;
1288
1289    fclose(f);
1290
1291    shader = _mesa_strdup(buffer);
1292    free(buffer);
1293
1294    return shader;
1295 }
1296
1297
1298 /**
1299  * Called via glShaderSource() and glShaderSourceARB() API functions.
1300  * Basically, concatenate the source code strings into one long string
1301  * and pass it to _mesa_shader_source().
1302  */
1303 void GLAPIENTRY
1304 _mesa_ShaderSourceARB(GLhandleARB shaderObj, GLsizei count,
1305                       const GLcharARB ** string, const GLint * length)
1306 {
1307    GET_CURRENT_CONTEXT(ctx);
1308    GLint *offsets;
1309    GLsizei i, totalLength;
1310    GLcharARB *source;
1311    GLuint checksum;
1312
1313    if (!shaderObj || string == NULL) {
1314       _mesa_error(ctx, GL_INVALID_VALUE, "glShaderSourceARB");
1315       return;
1316    }
1317
1318    /*
1319     * This array holds offsets of where the appropriate string ends, thus the
1320     * last element will be set to the total length of the source code.
1321     */
1322    offsets = (GLint *) malloc(count * sizeof(GLint));
1323    if (offsets == NULL) {
1324       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
1325       return;
1326    }
1327
1328    for (i = 0; i < count; i++) {
1329       if (string[i] == NULL) {
1330          free((GLvoid *) offsets);
1331          _mesa_error(ctx, GL_INVALID_OPERATION,
1332                      "glShaderSourceARB(null string)");
1333          return;
1334       }
1335       if (length == NULL || length[i] < 0)
1336          offsets[i] = strlen(string[i]);
1337       else
1338          offsets[i] = length[i];
1339       /* accumulate string lengths */
1340       if (i > 0)
1341          offsets[i] += offsets[i - 1];
1342    }
1343
1344    /* Total length of source string is sum off all strings plus two.
1345     * One extra byte for terminating zero, another extra byte to silence
1346     * valgrind warnings in the parser/grammer code.
1347     */
1348    totalLength = offsets[count - 1] + 2;
1349    source = (GLcharARB *) malloc(totalLength * sizeof(GLcharARB));
1350    if (source == NULL) {
1351       free((GLvoid *) offsets);
1352       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
1353       return;
1354    }
1355
1356    for (i = 0; i < count; i++) {
1357       GLint start = (i > 0) ? offsets[i - 1] : 0;
1358       memcpy(source + start, string[i],
1359              (offsets[i] - start) * sizeof(GLcharARB));
1360    }
1361    source[totalLength - 1] = '\0';
1362    source[totalLength - 2] = '\0';
1363
1364    if (SHADER_SUBST) {
1365       /* Compute the shader's source code checksum then try to open a file
1366        * named newshader_<CHECKSUM>.  If it exists, use it in place of the
1367        * original shader source code.  For debugging.
1368        */
1369       char filename[100];
1370       GLcharARB *newSource;
1371
1372       checksum = _mesa_str_checksum(source);
1373
1374       _mesa_snprintf(filename, sizeof(filename), "newshader_%d", checksum);
1375
1376       newSource = read_shader(filename);
1377       if (newSource) {
1378          fprintf(stderr, "Mesa: Replacing shader %u chksum=%d with %s\n",
1379                        shaderObj, checksum, filename);
1380          free(source);
1381          source = newSource;
1382       }
1383    }
1384
1385    shader_source(ctx, shaderObj, source);
1386
1387    if (SHADER_SUBST) {
1388       struct gl_shader *sh = _mesa_lookup_shader(ctx, shaderObj);
1389       if (sh)
1390          sh->SourceChecksum = checksum; /* save original checksum */
1391    }
1392
1393    free(offsets);
1394 }
1395
1396
1397 void GLAPIENTRY
1398 _mesa_UseProgramObjectARB(GLhandleARB program)
1399 {
1400    GET_CURRENT_CONTEXT(ctx);
1401    struct gl_shader_program *shProg;
1402    struct gl_transform_feedback_object *obj =
1403       ctx->TransformFeedback.CurrentObject;
1404
1405    ASSERT_OUTSIDE_BEGIN_END(ctx);
1406
1407    if (obj->Active && !obj->Paused) {
1408       _mesa_error(ctx, GL_INVALID_OPERATION,
1409                   "glUseProgram(transform feedback active)");
1410       return;
1411    }
1412
1413    if (program) {
1414       shProg = _mesa_lookup_shader_program_err(ctx, program, "glUseProgram");
1415       if (!shProg) {
1416          return;
1417       }
1418       if (!shProg->LinkStatus) {
1419          _mesa_error(ctx, GL_INVALID_OPERATION,
1420                      "glUseProgram(program %u not linked)", program);
1421          return;
1422       }
1423
1424       /* debug code */
1425       if (ctx->Shader.Flags & GLSL_USE_PROG) {
1426          print_shader_info(shProg);
1427       }
1428    }
1429    else {
1430       shProg = NULL;
1431    }
1432
1433    _mesa_use_program(ctx, shProg);
1434 }
1435
1436
1437 void GLAPIENTRY
1438 _mesa_ValidateProgramARB(GLhandleARB program)
1439 {
1440    GET_CURRENT_CONTEXT(ctx);
1441    validate_program(ctx, program);
1442 }
1443
1444 #ifdef FEATURE_ES2
1445
1446 void GLAPIENTRY
1447 _mesa_GetShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype,
1448                                GLint* range, GLint* precision)
1449 {
1450    const struct gl_program_constants *limits;
1451    const struct gl_precision *p;
1452    GET_CURRENT_CONTEXT(ctx);
1453
1454    switch (shadertype) {
1455    case GL_VERTEX_SHADER:
1456       limits = &ctx->Const.VertexProgram;
1457       break;
1458    case GL_FRAGMENT_SHADER:
1459       limits = &ctx->Const.FragmentProgram;
1460       break;
1461    default:
1462       _mesa_error(ctx, GL_INVALID_ENUM,
1463                   "glGetShaderPrecisionFormat(shadertype)");
1464       return;
1465    }
1466
1467    switch (precisiontype) {
1468    case GL_LOW_FLOAT:
1469       p = &limits->LowFloat;
1470       break;
1471    case GL_MEDIUM_FLOAT:
1472       p = &limits->MediumFloat;
1473       break;
1474    case GL_HIGH_FLOAT:
1475       p = &limits->HighFloat;
1476       break;
1477    case GL_LOW_INT:
1478       p = &limits->LowInt;
1479       break;
1480    case GL_MEDIUM_INT:
1481       p = &limits->MediumInt;
1482       break;
1483    case GL_HIGH_INT:
1484       p = &limits->HighInt;
1485       break;
1486    default:
1487       _mesa_error(ctx, GL_INVALID_ENUM,
1488                   "glGetShaderPrecisionFormat(precisiontype)");
1489       return;
1490    }
1491
1492    range[0] = p->RangeMin;
1493    range[1] = p->RangeMax;
1494    precision[0] = p->Precision;
1495 }
1496
1497
1498 void GLAPIENTRY
1499 _mesa_ReleaseShaderCompiler(void)
1500 {
1501    _mesa_destroy_shader_compiler_caches();
1502 }
1503
1504
1505 void GLAPIENTRY
1506 _mesa_ShaderBinary(GLint n, const GLuint* shaders, GLenum binaryformat,
1507                    const void* binary, GLint length)
1508 {
1509    GET_CURRENT_CONTEXT(ctx);
1510    (void) n;
1511    (void) shaders;
1512    (void) binaryformat;
1513    (void) binary;
1514    (void) length;
1515    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
1516 }
1517
1518 #endif /* FEATURE_ES2 */
1519
1520
1521 #if FEATURE_ARB_geometry_shader4
1522
1523 void GLAPIENTRY
1524 _mesa_ProgramParameteriARB(GLuint program, GLenum pname, GLint value)
1525 {
1526    struct gl_shader_program *shProg;
1527    GET_CURRENT_CONTEXT(ctx);
1528
1529    ASSERT_OUTSIDE_BEGIN_END(ctx);
1530
1531    shProg = _mesa_lookup_shader_program_err(ctx, program,
1532                                             "glProgramParameteri");
1533    if (!shProg)
1534       return;
1535
1536    switch (pname) {
1537    case GL_GEOMETRY_VERTICES_OUT_ARB:
1538       if (value < 1 ||
1539           (unsigned) value > ctx->Const.MaxGeometryOutputVertices) {
1540          _mesa_error(ctx, GL_INVALID_VALUE,
1541                      "glProgramParameteri(GL_GEOMETRY_VERTICES_OUT_ARB=%d",
1542                      value);
1543          return;
1544       }
1545       shProg->Geom.VerticesOut = value;
1546       break;
1547    case GL_GEOMETRY_INPUT_TYPE_ARB:
1548       switch (value) {
1549       case GL_POINTS:
1550       case GL_LINES:
1551       case GL_LINES_ADJACENCY_ARB:
1552       case GL_TRIANGLES:
1553       case GL_TRIANGLES_ADJACENCY_ARB:
1554          shProg->Geom.InputType = value;
1555          break;
1556       default:
1557          _mesa_error(ctx, GL_INVALID_VALUE,
1558                      "glProgramParameteri(geometry input type = %s",
1559                      _mesa_lookup_enum_by_nr(value));
1560          return;
1561       }
1562       break;
1563    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
1564       switch (value) {
1565       case GL_POINTS:
1566       case GL_LINE_STRIP:
1567       case GL_TRIANGLE_STRIP:
1568          shProg->Geom.OutputType = value;
1569          break;
1570       default:
1571          _mesa_error(ctx, GL_INVALID_VALUE,
1572                      "glProgramParameteri(geometry output type = %s",
1573                      _mesa_lookup_enum_by_nr(value));
1574          return;
1575       }
1576       break;
1577    default:
1578       _mesa_error(ctx, GL_INVALID_ENUM, "glProgramParameteriARB(pname=%s)",
1579                   _mesa_lookup_enum_by_nr(pname));
1580       break;
1581    }
1582 }
1583
1584 #endif
1585
1586 void
1587 _mesa_use_shader_program(struct gl_context *ctx, GLenum type,
1588                          struct gl_shader_program *shProg)
1589 {
1590    use_shader_program(ctx, type, shProg);
1591
1592    if (ctx->Driver.UseProgram)
1593       ctx->Driver.UseProgram(ctx, shProg);
1594 }
1595
1596 void GLAPIENTRY
1597 _mesa_UseShaderProgramEXT(GLenum type, GLuint program)
1598 {
1599    GET_CURRENT_CONTEXT(ctx);
1600    struct gl_shader_program *shProg = NULL;
1601
1602    ASSERT_OUTSIDE_BEGIN_END(ctx);
1603
1604    if (!validate_shader_target(ctx, type)) {
1605       _mesa_error(ctx, GL_INVALID_ENUM, "glUseShaderProgramEXT(type)");
1606       return;
1607    }
1608
1609    if (ctx->TransformFeedback.CurrentObject->Active &&
1610        !ctx->TransformFeedback.CurrentObject->Paused) {
1611       _mesa_error(ctx, GL_INVALID_OPERATION,
1612                   "glUseShaderProgramEXT(transform feedback is active)");
1613       return;
1614    }
1615
1616    if (program) {
1617       shProg = _mesa_lookup_shader_program_err(ctx, program,
1618                                                "glUseShaderProgramEXT");
1619       if (shProg == NULL)
1620          return;
1621
1622       if (!shProg->LinkStatus) {
1623          _mesa_error(ctx, GL_INVALID_OPERATION,
1624                      "glUseShaderProgramEXT(program not linked)");
1625          return;
1626       }
1627    }
1628
1629    _mesa_use_shader_program(ctx, type, shProg);
1630 }
1631
1632 void GLAPIENTRY
1633 _mesa_ActiveProgramEXT(GLuint program)
1634 {
1635    GET_CURRENT_CONTEXT(ctx);
1636    struct gl_shader_program *shProg = (program != 0)
1637       ? _mesa_lookup_shader_program_err(ctx, program, "glActiveProgramEXT")
1638       : NULL;
1639
1640    _mesa_active_program(ctx, shProg, "glActiveProgramEXT");
1641    return;
1642 }
1643
1644 GLuint GLAPIENTRY
1645 _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string)
1646 {
1647    GET_CURRENT_CONTEXT(ctx);
1648    const GLuint shader = create_shader(ctx, type);
1649    GLuint program = 0;
1650
1651    if (shader) {
1652       shader_source(ctx, shader, _mesa_strdup(string));
1653       compile_shader(ctx, shader);
1654
1655       program = create_shader_program(ctx);
1656       if (program) {
1657          struct gl_shader_program *shProg;
1658          struct gl_shader *sh;
1659          GLint compiled = GL_FALSE;
1660
1661          shProg = _mesa_lookup_shader_program(ctx, program);
1662          sh = _mesa_lookup_shader(ctx, shader);
1663
1664          get_shaderiv(ctx, shader, GL_COMPILE_STATUS, &compiled);
1665          if (compiled) {
1666             attach_shader(ctx, program, shader);
1667             link_program(ctx, program);
1668             detach_shader(ctx, program, shader);
1669
1670 #if 0
1671             /* Possibly... */
1672             if (active-user-defined-varyings-in-linked-program) {
1673                append-error-to-info-log;
1674                shProg->LinkStatus = GL_FALSE;
1675             }
1676 #endif
1677          }
1678
1679          ralloc_strcat(&shProg->InfoLog, sh->InfoLog);
1680       }
1681
1682       delete_shader(ctx, shader);
1683    }
1684
1685    return program;
1686 }
1687
1688 /**
1689  * Plug in shader-related functions into API dispatch table.
1690  */
1691 void
1692 _mesa_init_shader_dispatch(struct _glapi_table *exec)
1693 {
1694 #if FEATURE_GL
1695    /* GL_ARB_vertex/fragment_shader */
1696    SET_DeleteObjectARB(exec, _mesa_DeleteObjectARB);
1697    SET_GetHandleARB(exec, _mesa_GetHandleARB);
1698    SET_DetachObjectARB(exec, _mesa_DetachObjectARB);
1699    SET_CreateShaderObjectARB(exec, _mesa_CreateShaderObjectARB);
1700    SET_ShaderSourceARB(exec, _mesa_ShaderSourceARB);
1701    SET_CompileShaderARB(exec, _mesa_CompileShaderARB);
1702    SET_CreateProgramObjectARB(exec, _mesa_CreateProgramObjectARB);
1703    SET_AttachObjectARB(exec, _mesa_AttachObjectARB);
1704    SET_LinkProgramARB(exec, _mesa_LinkProgramARB);
1705    SET_UseProgramObjectARB(exec, _mesa_UseProgramObjectARB);
1706    SET_ValidateProgramARB(exec, _mesa_ValidateProgramARB);
1707    SET_GetObjectParameterfvARB(exec, _mesa_GetObjectParameterfvARB);
1708    SET_GetObjectParameterivARB(exec, _mesa_GetObjectParameterivARB);
1709    SET_GetInfoLogARB(exec, _mesa_GetInfoLogARB);
1710    SET_GetAttachedObjectsARB(exec, _mesa_GetAttachedObjectsARB);
1711    SET_GetShaderSourceARB(exec, _mesa_GetShaderSourceARB);
1712
1713    /* OpenGL 2.0 */
1714    SET_AttachShader(exec, _mesa_AttachShader);
1715    SET_CreateProgram(exec, _mesa_CreateProgram);
1716    SET_CreateShader(exec, _mesa_CreateShader);
1717    SET_DeleteProgram(exec, _mesa_DeleteProgram);
1718    SET_DeleteShader(exec, _mesa_DeleteShader);
1719    SET_DetachShader(exec, _mesa_DetachShader);
1720    SET_GetAttachedShaders(exec, _mesa_GetAttachedShaders);
1721    SET_GetProgramiv(exec, _mesa_GetProgramiv);
1722    SET_GetProgramInfoLog(exec, _mesa_GetProgramInfoLog);
1723    SET_GetShaderiv(exec, _mesa_GetShaderiv);
1724    SET_GetShaderInfoLog(exec, _mesa_GetShaderInfoLog);
1725    SET_IsProgram(exec, _mesa_IsProgram);
1726    SET_IsShader(exec, _mesa_IsShader);
1727
1728 #if FEATURE_ARB_vertex_shader
1729    SET_BindAttribLocationARB(exec, _mesa_BindAttribLocationARB);
1730    SET_GetActiveAttribARB(exec, _mesa_GetActiveAttribARB);
1731    SET_GetAttribLocationARB(exec, _mesa_GetAttribLocationARB);
1732 #endif
1733
1734 #if FEATURE_ARB_geometry_shader4
1735    SET_ProgramParameteriARB(exec, _mesa_ProgramParameteriARB);
1736 #endif
1737
1738    SET_UseShaderProgramEXT(exec, _mesa_UseShaderProgramEXT);
1739    SET_ActiveProgramEXT(exec, _mesa_ActiveProgramEXT);
1740    SET_CreateShaderProgramEXT(exec, _mesa_CreateShaderProgramEXT);
1741
1742    /* GL_EXT_gpu_shader4 / GL 3.0 */
1743    SET_BindFragDataLocationEXT(exec, _mesa_BindFragDataLocation);
1744    SET_GetFragDataLocationEXT(exec, _mesa_GetFragDataLocation);
1745
1746    /* GL_ARB_ES2_compatibility */
1747    SET_ReleaseShaderCompiler(exec, _mesa_ReleaseShaderCompiler);
1748    SET_GetShaderPrecisionFormat(exec, _mesa_GetShaderPrecisionFormat);
1749
1750 #endif /* FEATURE_GL */
1751 }
1752