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/shaderapi.h"
  45 #include "main/shaderobj.h"
  46 #include "program/program.h"
  47 #include "program/prog_parameter.h"
  48 #include "program/prog_uniform.h"
  49 #include "talloc.h"
  50 #include <stdbool.h>
  51
  52 /** Define this to enable shader substitution (see below) */
  53 #define SHADER_SUBST 0
  54
  55
  56 /**
  57  * Return mask of GLSL_x flags by examining the MESA_GLSL env var.
  58  */
  59 static GLbitfield
  60 get_shader_flags(void)
  61 {
  62    GLbitfield flags = 0x0;
  63    const char *env = _mesa_getenv("MESA_GLSL");
  64
  65    if (env) {
  66       if (strstr(env, "dump"))
  67          flags |= GLSL_DUMP;
  68       if (strstr(env, "log"))
  69          flags |= GLSL_LOG;
  70       if (strstr(env, "nopvert"))
  71          flags |= GLSL_NOP_VERT;
  72       if (strstr(env, "nopfrag"))
  73          flags |= GLSL_NOP_FRAG;
  74       if (strstr(env, "nopt"))
  75          flags |= GLSL_NO_OPT;
  76       else if (strstr(env, "opt"))
  77          flags |= GLSL_OPT;
  78       if (strstr(env, "uniform"))
  79          flags |= GLSL_UNIFORMS;
  80       if (strstr(env, "useprog"))
  81          flags |= GLSL_USE_PROG;
  82    }
  83
  84    return flags;
  85 }
  86
  87
  88 /**
  89  * Initialize context's shader state.
  90  */
  91 void
  92 _mesa_init_shader_state(struct gl_context *ctx)
  93 {
  94    /* Device drivers may override these to control what kind of instructions
  95     * are generated by the GLSL compiler.
  96     */
  97    struct gl_shader_compiler_options options;
  98    GLuint i;
  99
 100    memset(&options, 0, sizeof(options));
 101    options.MaxUnrollIterations = 32;
 102
 103    /* Default pragma settings */
 104    options.DefaultPragmas.Optimize = GL_TRUE;
 105
 106    for(i = 0; i < MESA_SHADER_TYPES; ++i)
 107       memcpy(&ctx->ShaderCompilerOptions[i], &options, sizeof(options));
 108
 109    ctx->Shader.Flags = get_shader_flags();
 110 }
 111
 112
 113 /**
 114  * Free the per-context shader-related state.
 115  */
 116 void
 117 _mesa_free_shader_state(struct gl_context *ctx)
 118 {
 119    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentVertexProgram, NULL);
 120    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentGeometryProgram,
 121                                   NULL);
 122    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentFragmentProgram,
 123                                   NULL);
 124    _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, NULL);
 125 }
 126
 127
 128 /**
 129  * Return the size of the given GLSL datatype, in floats (components).
 130  */
 131 GLint
 132 _mesa_sizeof_glsl_type(GLenum type)
 133 {
 134    switch (type) {
 135    case GL_FLOAT:
 136    case GL_INT:
 137    case GL_BOOL:
 138    case GL_SAMPLER_1D:
 139    case GL_SAMPLER_2D:
 140    case GL_SAMPLER_3D:
 141    case GL_SAMPLER_CUBE:
 142    case GL_SAMPLER_1D_SHADOW:
 143    case GL_SAMPLER_2D_SHADOW:
 144    case GL_SAMPLER_2D_RECT_ARB:
 145    case GL_SAMPLER_2D_RECT_SHADOW_ARB:
 146    case GL_SAMPLER_1D_ARRAY_EXT:
 147    case GL_SAMPLER_2D_ARRAY_EXT:
 148    case GL_SAMPLER_1D_ARRAY_SHADOW_EXT:
 149    case GL_SAMPLER_2D_ARRAY_SHADOW_EXT:
 150    case GL_SAMPLER_CUBE_SHADOW_EXT:
 151       return 1;
 152    case GL_FLOAT_VEC2:
 153    case GL_INT_VEC2:
 154    case GL_UNSIGNED_INT_VEC2:
 155    case GL_BOOL_VEC2:
 156       return 2;
 157    case GL_FLOAT_VEC3:
 158    case GL_INT_VEC3:
 159    case GL_UNSIGNED_INT_VEC3:
 160    case GL_BOOL_VEC3:
 161       return 3;
 162    case GL_FLOAT_VEC4:
 163    case GL_INT_VEC4:
 164    case GL_UNSIGNED_INT_VEC4:
 165    case GL_BOOL_VEC4:
 166       return 4;
 167    case GL_FLOAT_MAT2:
 168    case GL_FLOAT_MAT2x3:
 169    case GL_FLOAT_MAT2x4:
 170       return 8; /* two float[4] vectors */
 171    case GL_FLOAT_MAT3:
 172    case GL_FLOAT_MAT3x2:
 173    case GL_FLOAT_MAT3x4:
 174       return 12; /* three float[4] vectors */
 175    case GL_FLOAT_MAT4:
 176    case GL_FLOAT_MAT4x2:
 177    case GL_FLOAT_MAT4x3:
 178       return 16;  /* four float[4] vectors */
 179    default:
 180       _mesa_problem(NULL, "Invalid type in _mesa_sizeof_glsl_type()");
 181       return 1;
 182    }
 183 }
 184
 185
 186 /**
 187  * Copy string from <src> to <dst>, up to maxLength characters, returning
 188  * length of <dst> in <length>.
 189  * \param src  the strings source
 190  * \param maxLength  max chars to copy
 191  * \param length  returns number of chars copied
 192  * \param dst  the string destination
 193  */
 194 void
 195 _mesa_copy_string(GLchar *dst, GLsizei maxLength,
 196                   GLsizei *length, const GLchar *src)
 197 {
 198    GLsizei len;
 199    for (len = 0; len < maxLength - 1 && src && src[len]; len++)
 200       dst[len] = src[len];
 201    if (maxLength > 0)
 202       dst[len] = 0;
 203    if (length)
 204       *length = len;
 205 }
 206
 207
 208
 209 /**
 210  * Confirm that the a shader type is valid and supported by the implementation
 211  *
 212  * \param ctx   Current GL context
 213  * \param type  Shader target
 214  *
 215  */
 216 static bool
 217 validate_shader_target(const struct gl_context *ctx, GLenum type)
 218 {
 219    switch (type) {
 220 #if FEATURE_ARB_fragment_shader
 221    case GL_FRAGMENT_SHADER:
 222       return ctx->Extensions.ARB_fragment_shader;
 223 #endif
 224 #if FEATURE_ARB_vertex_shader
 225    case GL_VERTEX_SHADER:
 226       return ctx->Extensions.ARB_vertex_shader;
 227 #endif
 228 #if FEATURE_ARB_geometry_shader4
 229    case GL_GEOMETRY_SHADER_ARB:
 230       return ctx->Extensions.ARB_geometry_shader4;
 231 #endif
 232    default:
 233       return false;
 234    }
 235 }
 236
 237
 238 /**
 239  * Find the length of the longest transform feedback varying name
 240  * which was specified with glTransformFeedbackVaryings().
 241  */
 242 static GLint
 243 longest_feedback_varying_name(const struct gl_shader_program *shProg)
 244 {
 245    GLuint i;
 246    GLint max = 0;
 247    for (i = 0; i < shProg->TransformFeedback.NumVarying; i++) {
 248       GLint len = strlen(shProg->TransformFeedback.VaryingNames[i]);
 249       if (len > max)
 250          max = len;
 251    }
 252    return max;
 253 }
 254
 255
 256
 257 static GLboolean
 258 is_program(struct gl_context *ctx, GLuint name)
 259 {
 260    struct gl_shader_program *shProg = _mesa_lookup_shader_program(ctx, name);
 261    return shProg ? GL_TRUE : GL_FALSE;
 262 }
 263
 264
 265 static GLboolean
 266 is_shader(struct gl_context *ctx, GLuint name)
 267 {
 268    struct gl_shader *shader = _mesa_lookup_shader(ctx, name);
 269    return shader ? GL_TRUE : GL_FALSE;
 270 }
 271
 272
 273 /**
 274  * Attach shader to a shader program.
 275  */
 276 static void
 277 attach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
 278 {
 279    struct gl_shader_program *shProg;
 280    struct gl_shader *sh;
 281    GLuint i, n;
 282
 283    shProg = _mesa_lookup_shader_program_err(ctx, program, "glAttachShader");
 284    if (!shProg)
 285       return;
 286
 287    sh = _mesa_lookup_shader_err(ctx, shader, "glAttachShader");
 288    if (!sh) {
 289       return;
 290    }
 291
 292    n = shProg->NumShaders;
 293    for (i = 0; i < n; i++) {
 294       if (shProg->Shaders[i] == sh) {
 295          /* The shader is already attched to this program.  The
 296           * GL_ARB_shader_objects spec says:
 297           *
 298           *     "The error INVALID_OPERATION is generated by AttachObjectARB
 299           *     if <obj> is already attached to <containerObj>."
 300           */
 301          _mesa_error(ctx, GL_INVALID_OPERATION, "glAttachShader");
 302          return;
 303       }
 304    }
 305
 306    /* grow list */
 307    shProg->Shaders = (struct gl_shader **)
 308       _mesa_realloc(shProg->Shaders,
 309                     n * sizeof(struct gl_shader *),
 310                     (n + 1) * sizeof(struct gl_shader *));
 311    if (!shProg->Shaders) {
 312       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAttachShader");
 313       return;
 314    }
 315
 316    /* append */
 317    shProg->Shaders[n] = NULL; /* since realloc() didn't zero the new space */
 318    _mesa_reference_shader(ctx, &shProg->Shaders[n], sh);
 319    shProg->NumShaders++;
 320 }
 321
 322
 323 static GLint
 324 get_attrib_location(struct gl_context *ctx, GLuint program, const GLchar *name)
 325 {
 326    struct gl_shader_program *shProg
 327       = _mesa_lookup_shader_program_err(ctx, program, "glGetAttribLocation");
 328
 329    if (!shProg) {
 330       return -1;
 331    }
 332
 333    if (!shProg->LinkStatus) {
 334       _mesa_error(ctx, GL_INVALID_OPERATION,
 335                   "glGetAttribLocation(program not linked)");
 336       return -1;
 337    }
 338
 339    if (!name)
 340       return -1;
 341
 342    if (shProg->VertexProgram) {
 343       const struct gl_program_parameter_list *attribs =
 344          shProg->VertexProgram->Base.Attributes;
 345       if (attribs) {
 346          GLint i = _mesa_lookup_parameter_index(attribs, -1, name);
 347          if (i >= 0) {
 348             return attribs->Parameters[i].StateIndexes[0];
 349          }
 350       }
 351    }
 352    return -1;
 353 }
 354
 355
 356 static void
 357 bind_attrib_location(struct gl_context *ctx, GLuint program, GLuint index,
 358                      const GLchar *name)
 359 {
 360    struct gl_shader_program *shProg;
 361    const GLint size = -1; /* unknown size */
 362    GLint i, oldIndex;
 363    GLenum datatype = GL_FLOAT_VEC4;
 364
 365    shProg = _mesa_lookup_shader_program_err(ctx, program,
 366                                             "glBindAttribLocation");
 367    if (!shProg) {
 368       return;
 369    }
 370
 371    if (!name)
 372       return;
 373
 374    if (strncmp(name, "gl_", 3) == 0) {
 375       _mesa_error(ctx, GL_INVALID_OPERATION,
 376                   "glBindAttribLocation(illegal name)");
 377       return;
 378    }
 379
 380    if (index >= ctx->Const.VertexProgram.MaxAttribs) {
 381       _mesa_error(ctx, GL_INVALID_VALUE, "glBindAttribLocation(index)");
 382       return;
 383    }
 384
 385    if (shProg->LinkStatus) {
 386       /* get current index/location for the attribute */
 387       oldIndex = get_attrib_location(ctx, program, name);
 388    }
 389    else {
 390       oldIndex = -1;
 391    }
 392
 393    /* this will replace the current value if it's already in the list */
 394    i = _mesa_add_attribute(shProg->Attributes, name, size, datatype, index);
 395    if (i < 0) {
 396       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindAttribLocation");
 397       return;
 398    }
 399
 400    /*
 401     * Note that this attribute binding won't go into effect until
 402     * glLinkProgram is called again.
 403     */
 404 }
 405
 406
 407 static void
 408 bind_frag_data_location(struct gl_context *ctx, GLuint program,
 409                         GLuint colorNumber, const GLchar *name)
 410 {
 411    _mesa_problem(ctx, "bind_frag_data_location() not implemented yet");
 412 }
 413
 414
 415 static GLuint
 416 create_shader(struct gl_context *ctx, GLenum type)
 417 {
 418    struct gl_shader *sh;
 419    GLuint name;
 420
 421    if (!validate_shader_target(ctx, type)) {
 422       _mesa_error(ctx, GL_INVALID_ENUM, "CreateShader(type)");
 423       return 0;
 424    }
 425
 426    name = _mesa_HashFindFreeKeyBlock(ctx->Shared->ShaderObjects, 1);
 427    sh = ctx->Driver.NewShader(ctx, name, type);
 428    _mesa_HashInsert(ctx->Shared->ShaderObjects, name, sh);
 429
 430    return name;
 431 }
 432
 433
 434 static GLuint
 435 create_shader_program(struct gl_context *ctx)
 436 {
 437    GLuint name;
 438    struct gl_shader_program *shProg;
 439
 440    name = _mesa_HashFindFreeKeyBlock(ctx->Shared->ShaderObjects, 1);
 441
 442    shProg = ctx->Driver.NewShaderProgram(ctx, name);
 443
 444    _mesa_HashInsert(ctx->Shared->ShaderObjects, name, shProg);
 445
 446    assert(shProg->RefCount == 1);
 447
 448    return name;
 449 }
 450
 451
 452 /**
 453  * Named w/ "2" to indicate OpenGL 2.x vs GL_ARB_fragment_programs's
 454  * DeleteProgramARB.
 455  */
 456 static void
 457 delete_shader_program(struct gl_context *ctx, GLuint name)
 458 {
 459    /*
 460     * NOTE: deleting shaders/programs works a bit differently than
 461     * texture objects (and buffer objects, etc).  Shader/program
 462     * handles/IDs exist in the hash table until the object is really
 463     * deleted (refcount==0).  With texture objects, the handle/ID is
 464     * removed from the hash table in glDeleteTextures() while the tex
 465     * object itself might linger until its refcount goes to zero.
 466     */
 467    struct gl_shader_program *shProg;
 468
 469    shProg = _mesa_lookup_shader_program_err(ctx, name, "glDeleteProgram");
 470    if (!shProg)
 471       return;
 472
 473    shProg->DeletePending = GL_TRUE;
 474
 475    /* effectively, decr shProg's refcount */
 476    _mesa_reference_shader_program(ctx, &shProg, NULL);
 477 }
 478
 479
 480 static void
 481 delete_shader(struct gl_context *ctx, GLuint shader)
 482 {
 483    struct gl_shader *sh;
 484
 485    sh = _mesa_lookup_shader_err(ctx, shader, "glDeleteShader");
 486    if (!sh)
 487       return;
 488
 489    sh->DeletePending = GL_TRUE;
 490
 491    /* effectively, decr sh's refcount */
 492    _mesa_reference_shader(ctx, &sh, NULL);
 493 }
 494
 495
 496 static void
 497 detach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
 498 {
 499    struct gl_shader_program *shProg;
 500    GLuint n;
 501    GLuint i, j;
 502
 503    shProg = _mesa_lookup_shader_program_err(ctx, program, "glDetachShader");
 504    if (!shProg)
 505       return;
 506
 507    n = shProg->NumShaders;
 508
 509    for (i = 0; i < n; i++) {
 510       if (shProg->Shaders[i]->Name == shader) {
 511          /* found it */
 512          struct gl_shader **newList;
 513
 514          /* release */
 515          _mesa_reference_shader(ctx, &shProg->Shaders[i], NULL);
 516
 517          /* alloc new, smaller array */
 518          newList = (struct gl_shader **)
 519             malloc((n - 1) * sizeof(struct gl_shader *));
 520          if (!newList) {
 521             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDetachShader");
 522             return;
 523          }
 524          for (j = 0; j < i; j++) {
 525             newList[j] = shProg->Shaders[j];
 526          }
 527          while (++i < n)
 528             newList[j++] = shProg->Shaders[i];
 529          free(shProg->Shaders);
 530
 531          shProg->Shaders = newList;
 532          shProg->NumShaders = n - 1;
 533
 534 #ifdef DEBUG
 535          /* sanity check */
 536          {
 537             for (j = 0; j < shProg->NumShaders; j++) {
 538                assert(shProg->Shaders[j]->Type == GL_VERTEX_SHADER ||
 539                       shProg->Shaders[j]->Type == GL_FRAGMENT_SHADER);
 540                assert(shProg->Shaders[j]->RefCount > 0);
 541             }
 542          }
 543 #endif
 544
 545          return;
 546       }
 547    }
 548
 549    /* not found */
 550    {
 551       GLenum err;
 552       if (is_shader(ctx, shader))
 553          err = GL_INVALID_OPERATION;
 554       else if (is_program(ctx, shader))
 555          err = GL_INVALID_OPERATION;
 556       else
 557          err = GL_INVALID_VALUE;
 558       _mesa_error(ctx, err, "glDetachProgram(shader)");
 559       return;
 560    }
 561 }
 562
 563
 564 static void
 565 get_active_attrib(struct gl_context *ctx, GLuint program, GLuint index,
 566                   GLsizei maxLength, GLsizei *length, GLint *size,
 567                   GLenum *type, GLchar *nameOut)
 568 {
 569    const struct gl_program_parameter_list *attribs = NULL;
 570    struct gl_shader_program *shProg;
 571
 572    shProg = _mesa_lookup_shader_program_err(ctx, program, "glGetActiveAttrib");
 573    if (!shProg)
 574       return;
 575
 576    if (shProg->VertexProgram)
 577       attribs = shProg->VertexProgram->Base.Attributes;
 578
 579    if (!attribs || index >= attribs->NumParameters) {
 580       _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveAttrib(index)");
 581       return;
 582    }
 583
 584    _mesa_copy_string(nameOut, maxLength, length,
 585                      attribs->Parameters[index].Name);
 586
 587    if (size)
 588       *size = attribs->Parameters[index].Size
 589          / _mesa_sizeof_glsl_type(attribs->Parameters[index].DataType);
 590
 591    if (type)
 592       *type = attribs->Parameters[index].DataType;
 593 }
 594
 595
 596 /**
 597  * Return list of shaders attached to shader program.
 598  */
 599 static void
 600 get_attached_shaders(struct gl_context *ctx, GLuint program, GLsizei maxCount,
 601                      GLsizei *count, GLuint *obj)
 602 {
 603    struct gl_shader_program *shProg =
 604       _mesa_lookup_shader_program_err(ctx, program, "glGetAttachedShaders");
 605    if (shProg) {
 606       GLuint i;
 607       for (i = 0; i < (GLuint) maxCount && i < shProg->NumShaders; i++) {
 608          obj[i] = shProg->Shaders[i]->Name;
 609       }
 610       if (count)
 611          *count = i;
 612    }
 613 }
 614
 615
 616 static GLint
 617 get_frag_data_location(struct gl_context *ctx, GLuint program,
 618                        const GLchar *name)
 619 {
 620    _mesa_problem(ctx, "get_frag_data_location() not implemented yet");
 621    return -1;
 622 }
 623
 624
 625
 626 /**
 627  * glGetHandleARB() - return ID/name of currently bound shader program.
 628  */
 629 static GLuint
 630 get_handle(struct gl_context *ctx, GLenum pname)
 631 {
 632    if (pname == GL_PROGRAM_OBJECT_ARB) {
 633       if (ctx->Shader.ActiveProgram)
 634          return ctx->Shader.ActiveProgram->Name;
 635       else
 636          return 0;
 637    }
 638    else {
 639       _mesa_error(ctx, GL_INVALID_ENUM, "glGetHandleARB");
 640       return 0;
 641    }
 642 }
 643
 644
 645 /**
 646  * glGetProgramiv() - get shader program state.
 647  * Note that this is for GLSL shader programs, not ARB vertex/fragment
 648  * programs (see glGetProgramivARB).
 649  */
 650 static void
 651 get_programiv(struct gl_context *ctx, GLuint program, GLenum pname, GLint *params)
 652 {
 653    const struct gl_program_parameter_list *attribs;
 654    struct gl_shader_program *shProg
 655       = _mesa_lookup_shader_program(ctx, program);
 656
 657    if (!shProg) {
 658       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramiv(program)");
 659       return;
 660    }
 661
 662    if (shProg->VertexProgram)
 663       attribs = shProg->VertexProgram->Base.Attributes;
 664    else
 665       attribs = NULL;
 666
 667    switch (pname) {
 668    case GL_DELETE_STATUS:
 669       *params = shProg->DeletePending;
 670       break;
 671    case GL_LINK_STATUS:
 672       *params = shProg->LinkStatus;
 673       break;
 674    case GL_VALIDATE_STATUS:
 675       *params = shProg->Validated;
 676       break;
 677    case GL_INFO_LOG_LENGTH:
 678       *params = shProg->InfoLog ? strlen(shProg->InfoLog) + 1 : 0;
 679       break;
 680    case GL_ATTACHED_SHADERS:
 681       *params = shProg->NumShaders;
 682       break;
 683    case GL_ACTIVE_ATTRIBUTES:
 684       *params = attribs ? attribs->NumParameters : 0;
 685       break;
 686    case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
 687       *params = _mesa_longest_parameter_name(attribs, PROGRAM_INPUT) + 1;
 688       break;
 689    case GL_ACTIVE_UNIFORMS:
 690       *params = shProg->Uniforms ? shProg->Uniforms->NumUniforms : 0;
 691       break;
 692    case GL_ACTIVE_UNIFORM_MAX_LENGTH:
 693       *params = _mesa_longest_uniform_name(shProg->Uniforms);
 694       if (*params > 0)
 695          (*params)++;  /* add one for terminating zero */
 696       break;
 697    case GL_PROGRAM_BINARY_LENGTH_OES:
 698       *params = 0;
 699       break;
 700 #if FEATURE_EXT_transform_feedback
 701    case GL_TRANSFORM_FEEDBACK_VARYINGS:
 702       *params = shProg->TransformFeedback.NumVarying;
 703       break;
 704    case GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH:
 705       *params = longest_feedback_varying_name(shProg) + 1;
 706       break;
 707    case GL_TRANSFORM_FEEDBACK_BUFFER_MODE:
 708       *params = shProg->TransformFeedback.BufferMode;
 709       break;
 710 #endif
 711 #if FEATURE_ARB_geometry_shader4
 712    case GL_GEOMETRY_VERTICES_OUT_ARB:
 713       *params = shProg->Geom.VerticesOut;
 714       break;
 715    case GL_GEOMETRY_INPUT_TYPE_ARB:
 716       *params = shProg->Geom.InputType;
 717       break;
 718    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
 719       *params = shProg->Geom.OutputType;
 720       break;
 721 #endif
 722    default:
 723       _mesa_error(ctx, GL_INVALID_ENUM, "glGetProgramiv(pname)");
 724       return;
 725    }
 726 }
 727
 728
 729 /**
 730  * glGetShaderiv() - get GLSL shader state
 731  */
 732 static void
 733 get_shaderiv(struct gl_context *ctx, GLuint name, GLenum pname, GLint *params)
 734 {
 735    struct gl_shader *shader =
 736       _mesa_lookup_shader_err(ctx, name, "glGetShaderiv");
 737
 738    if (!shader) {
 739       return;
 740    }
 741
 742    switch (pname) {
 743    case GL_SHADER_TYPE:
 744       *params = shader->Type;
 745       break;
 746    case GL_DELETE_STATUS:
 747       *params = shader->DeletePending;
 748       break;
 749    case GL_COMPILE_STATUS:
 750       *params = shader->CompileStatus;
 751       break;
 752    case GL_INFO_LOG_LENGTH:
 753       *params = shader->InfoLog ? strlen(shader->InfoLog) + 1 : 0;
 754       break;
 755    case GL_SHADER_SOURCE_LENGTH:
 756       *params = shader->Source ? strlen((char *) shader->Source) + 1 : 0;
 757       break;
 758    default:
 759       _mesa_error(ctx, GL_INVALID_ENUM, "glGetShaderiv(pname)");
 760       return;
 761    }
 762 }
 763
 764
 765 static void
 766 get_program_info_log(struct gl_context *ctx, GLuint program, GLsizei bufSize,
 767                      GLsizei *length, GLchar *infoLog)
 768 {
 769    struct gl_shader_program *shProg
 770       = _mesa_lookup_shader_program(ctx, program);
 771    if (!shProg) {
 772       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramInfoLog(program)");
 773       return;
 774    }
 775    _mesa_copy_string(infoLog, bufSize, length, shProg->InfoLog);
 776 }
 777
 778
 779 static void
 780 get_shader_info_log(struct gl_context *ctx, GLuint shader, GLsizei bufSize,
 781                     GLsizei *length, GLchar *infoLog)
 782 {
 783    struct gl_shader *sh = _mesa_lookup_shader(ctx, shader);
 784    if (!sh) {
 785       _mesa_error(ctx, GL_INVALID_VALUE, "glGetShaderInfoLog(shader)");
 786       return;
 787    }
 788    _mesa_copy_string(infoLog, bufSize, length, sh->InfoLog);
 789 }
 790
 791
 792 /**
 793  * Return shader source code.
 794  */
 795 static void
 796 get_shader_source(struct gl_context *ctx, GLuint shader, GLsizei maxLength,
 797                   GLsizei *length, GLchar *sourceOut)
 798 {
 799    struct gl_shader *sh;
 800    sh = _mesa_lookup_shader_err(ctx, shader, "glGetShaderSource");
 801    if (!sh) {
 802       return;
 803    }
 804    _mesa_copy_string(sourceOut, maxLength, length, sh->Source);
 805 }
 806
 807
 808 /**
 809  * Set/replace shader source code.
 810  */
 811 static void
 812 shader_source(struct gl_context *ctx, GLuint shader, const GLchar *source)
 813 {
 814    struct gl_shader *sh;
 815
 816    sh = _mesa_lookup_shader_err(ctx, shader, "glShaderSource");
 817    if (!sh)
 818       return;
 819
 820    /* free old shader source string and install new one */
 821    if (sh->Source) {
 822       free((void *) sh->Source);
 823    }
 824    sh->Source = source;
 825    sh->CompileStatus = GL_FALSE;
 826 #ifdef DEBUG
 827    sh->SourceChecksum = _mesa_str_checksum(sh->Source);
 828 #endif
 829 }
 830
 831
 832 /**
 833  * Compile a shader.
 834  */
 835 static void
 836 compile_shader(struct gl_context *ctx, GLuint shaderObj)
 837 {
 838    struct gl_shader *sh;
 839    struct gl_shader_compiler_options *options;
 840
 841    sh = _mesa_lookup_shader_err(ctx, shaderObj, "glCompileShader");
 842    if (!sh)
 843       return;
 844
 845    options = &ctx->ShaderCompilerOptions[_mesa_shader_type_to_index(sh->Type)];
 846
 847    /* set default pragma state for shader */
 848    sh->Pragmas = options->DefaultPragmas;
 849
 850    /* this call will set the sh->CompileStatus field to indicate if
 851     * compilation was successful.
 852     */
 853    _mesa_glsl_compile_shader(ctx, sh);
 854 }
 855
 856
 857 /**
 858  * Link a program's shaders.
 859  */
 860 static void
 861 link_program(struct gl_context *ctx, GLuint program)
 862 {
 863    struct gl_shader_program *shProg;
 864    struct gl_transform_feedback_object *obj =
 865       ctx->TransformFeedback.CurrentObject;
 866
 867    shProg = _mesa_lookup_shader_program_err(ctx, program, "glLinkProgram");
 868    if (!shProg)
 869       return;
 870
 871    if (obj->Active
 872        && (shProg == ctx->Shader.CurrentVertexProgram
 873            || shProg == ctx->Shader.CurrentGeometryProgram
 874            || shProg == ctx->Shader.CurrentFragmentProgram)) {
 875       _mesa_error(ctx, GL_INVALID_OPERATION,
 876                   "glLinkProgram(transform feedback active");
 877       return;
 878    }
 879
 880    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 881
 882    _mesa_glsl_link_shader(ctx, shProg);
 883
 884    /* debug code */
 885    if (0) {
 886       GLuint i;
 887
 888       printf("Link %u shaders in program %u: %s\n",
 889                    shProg->NumShaders, shProg->Name,
 890                    shProg->LinkStatus ? "Success" : "Failed");
 891
 892       for (i = 0; i < shProg->NumShaders; i++) {
 893          printf(" shader %u, type 0x%x\n",
 894                       shProg->Shaders[i]->Name,
 895                       shProg->Shaders[i]->Type);
 896       }
 897    }
 898 }
 899
 900
 901 /**
 902  * Print basic shader info (for debug).
 903  */
 904 static void
 905 print_shader_info(const struct gl_shader_program *shProg)
 906 {
 907    GLuint i;
 908
 909    printf("Mesa: glUseProgram(%u)\n", shProg->Name);
 910    for (i = 0; i < shProg->NumShaders; i++) {
 911       const char *s;
 912       switch (shProg->Shaders[i]->Type) {
 913       case GL_VERTEX_SHADER:
 914          s = "vertex";
 915          break;
 916       case GL_FRAGMENT_SHADER:
 917          s = "fragment";
 918          break;
 919       case GL_GEOMETRY_SHADER:
 920          s = "geometry";
 921          break;
 922       default:
 923          s = "";
 924       }
 925       printf("  %s shader %u, checksum %u\n", s,
 926              shProg->Shaders[i]->Name,
 927              shProg->Shaders[i]->SourceChecksum);
 928    }
 929    if (shProg->VertexProgram)
 930       printf("  vert prog %u\n", shProg->VertexProgram->Base.Id);
 931    if (shProg->FragmentProgram)
 932       printf("  frag prog %u\n", shProg->FragmentProgram->Base.Id);
 933 }
 934
 935
 936 /**
 937  * Use the named shader program for subsequent glUniform calls
 938  */
 939 static void
 940 active_program(struct gl_context *ctx, struct gl_shader_program *shProg,
 941                const char *caller)
 942 {
 943    if ((shProg != NULL) && !shProg->LinkStatus) {
 944       _mesa_error(ctx, GL_INVALID_OPERATION,
 945                   "%s(program %u not linked)", caller, shProg->Name);
 946       return;
 947    }
 948
 949    if (ctx->Shader.ActiveProgram != shProg) {
 950       _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, shProg);
 951    }
 952 }
 953
 954 /**
 955  */
 956 static bool
 957 use_shader_program(struct gl_context *ctx, GLenum type,
 958                    struct gl_shader_program *shProg)
 959 {
 960    struct gl_shader_program **target;
 961
 962    switch (type) {
 963 #if FEATURE_ARB_vertex_shader
 964    case GL_VERTEX_SHADER:
 965       target = &ctx->Shader.CurrentVertexProgram;
 966       if ((shProg == NULL)
 967           || (shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL)) {
 968          shProg = NULL;
 969       }
 970       break;
 971 #endif
 972 #if FEATURE_ARB_geometry_shader4
 973    case GL_GEOMETRY_SHADER_ARB:
 974       target = &ctx->Shader.CurrentGeometryProgram;
 975       if ((shProg == NULL)
 976           || (shProg->_LinkedShaders[MESA_SHADER_GEOMETRY] == NULL)) {
 977          shProg = NULL;
 978       }
 979       break;
 980 #endif
 981 #if FEATURE_ARB_fragment_shader
 982    case GL_FRAGMENT_SHADER:
 983       target = &ctx->Shader.CurrentFragmentProgram;
 984       if ((shProg == NULL)
 985           || (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL)) {
 986          shProg = NULL;
 987       }
 988       break;
 989 #endif
 990    default:
 991       return false;
 992    }
 993
 994    if (*target != shProg) {
 995       _mesa_reference_shader_program(ctx, target, shProg);
 996       return true;
 997    }
 998
 999    return false;
1000 }
1001
1002 /**
1003  * Use the named shader program for subsequent rendering.
1004  */
1005 void
1006 _mesa_use_program(struct gl_context *ctx, GLuint program)
1007 {
1008    struct gl_shader_program *shProg;
1009    struct gl_transform_feedback_object *obj =
1010       ctx->TransformFeedback.CurrentObject;
1011    bool changed = false;
1012
1013    if (obj->Active) {
1014       _mesa_error(ctx, GL_INVALID_OPERATION,
1015                   "glUseProgram(transform feedback active)");
1016       return;
1017    }
1018
1019    if (program) {
1020       shProg = _mesa_lookup_shader_program_err(ctx, program, "glUseProgram");
1021       if (!shProg) {
1022          return;
1023       }
1024       if (!shProg->LinkStatus) {
1025          _mesa_error(ctx, GL_INVALID_OPERATION,
1026                      "glUseProgram(program %u not linked)", program);
1027          return;
1028       }
1029
1030       /* debug code */
1031       if (ctx->Shader.Flags & GLSL_USE_PROG) {
1032          print_shader_info(shProg);
1033       }
1034    }
1035    else {
1036       shProg = NULL;
1037    }
1038
1039    changed = use_shader_program(ctx, GL_VERTEX_SHADER, shProg);
1040    changed = use_shader_program(ctx, GL_GEOMETRY_SHADER_ARB, shProg)
1041       || changed;
1042    changed = use_shader_program(ctx, GL_FRAGMENT_SHADER, shProg)
1043       || changed;
1044    active_program(ctx, shProg, "glUseProgram");
1045
1046    if (changed) {
1047       FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
1048    }
1049
1050    if (ctx->Driver.UseProgram)
1051       ctx->Driver.UseProgram(ctx, shProg);
1052 }
1053
1054
1055 /**
1056  * Validate a program's samplers.
1057  * Specifically, check that there aren't two samplers of different types
1058  * pointing to the same texture unit.
1059  * \return GL_TRUE if valid, GL_FALSE if invalid
1060  */
1061 static GLboolean
1062 validate_samplers(const struct gl_program *prog, char *errMsg)
1063 {
1064    static const char *targetName[] = {
1065       "TEXTURE_2D_ARRAY",
1066       "TEXTURE_1D_ARRAY",
1067       "TEXTURE_CUBE",
1068       "TEXTURE_3D",
1069       "TEXTURE_RECT",
1070       "TEXTURE_2D",
1071       "TEXTURE_1D",
1072    };
1073    GLint targetUsed[MAX_TEXTURE_IMAGE_UNITS];
1074    GLbitfield samplersUsed = prog->SamplersUsed;
1075    GLuint i;
1076
1077    assert(Elements(targetName) == NUM_TEXTURE_TARGETS);
1078
1079    if (samplersUsed == 0x0)
1080       return GL_TRUE;
1081
1082    for (i = 0; i < Elements(targetUsed); i++)
1083       targetUsed[i] = -1;
1084
1085    /* walk over bits which are set in 'samplers' */
1086    while (samplersUsed) {
1087       GLuint unit;
1088       gl_texture_index target;
1089       GLint sampler = _mesa_ffs(samplersUsed) - 1;
1090       assert(sampler >= 0);
1091       assert(sampler < MAX_TEXTURE_IMAGE_UNITS);
1092       unit = prog->SamplerUnits[sampler];
1093       target = prog->SamplerTargets[sampler];
1094       if (targetUsed[unit] != -1 && targetUsed[unit] != (int) target) {
1095          _mesa_snprintf(errMsg, 100,
1096                   "Texture unit %d is accessed both as %s and %s",
1097                   unit, targetName[targetUsed[unit]], targetName[target]);
1098          return GL_FALSE;
1099       }
1100       targetUsed[unit] = target;
1101       samplersUsed ^= (1 << sampler);
1102    }
1103
1104    return GL_TRUE;
1105 }
1106
1107
1108 /**
1109  * Do validation of the given shader program.
1110  * \param errMsg  returns error message if validation fails.
1111  * \return GL_TRUE if valid, GL_FALSE if invalid (and set errMsg)
1112  */
1113 static GLboolean
1114 validate_shader_program(const struct gl_shader_program *shProg,
1115                         char *errMsg)
1116 {
1117    const struct gl_vertex_program *vp = shProg->VertexProgram;
1118    const struct gl_fragment_program *fp = shProg->FragmentProgram;
1119
1120    if (!shProg->LinkStatus) {
1121       return GL_FALSE;
1122    }
1123
1124    /* From the GL spec, a program is invalid if any of these are true:
1125
1126      any two active samplers in the current program object are of
1127      different types, but refer to the same texture image unit,
1128
1129      any active sampler in the current program object refers to a texture
1130      image unit where fixed-function fragment processing accesses a
1131      texture target that does not match the sampler type, or
1132
1133      the sum of the number of active samplers in the program and the
1134      number of texture image units enabled for fixed-function fragment
1135      processing exceeds the combined limit on the total number of texture
1136      image units allowed.
1137    */
1138
1139
1140    /*
1141     * Check: any two active samplers in the current program object are of
1142     * different types, but refer to the same texture image unit,
1143     */
1144    if (vp && !validate_samplers(&vp->Base, errMsg)) {
1145       return GL_FALSE;
1146    }
1147    if (fp && !validate_samplers(&fp->Base, errMsg)) {
1148       return GL_FALSE;
1149    }
1150
1151    return GL_TRUE;
1152 }
1153
1154
1155 /**
1156  * Called via glValidateProgram()
1157  */
1158 static void
1159 validate_program(struct gl_context *ctx, GLuint program)
1160 {
1161    struct gl_shader_program *shProg;
1162    char errMsg[100];
1163
1164    shProg = _mesa_lookup_shader_program_err(ctx, program, "glValidateProgram");
1165    if (!shProg) {
1166       return;
1167    }
1168
1169    shProg->Validated = validate_shader_program(shProg, errMsg);
1170    if (!shProg->Validated) {
1171       /* update info log */
1172       if (shProg->InfoLog) {
1173          talloc_free(shProg->InfoLog);
1174       }
1175       shProg->InfoLog = talloc_strdup(shProg, errMsg);
1176    }
1177 }
1178
1179
1180
1181 void GLAPIENTRY
1182 _mesa_AttachObjectARB(GLhandleARB program, GLhandleARB shader)
1183 {
1184    GET_CURRENT_CONTEXT(ctx);
1185    attach_shader(ctx, program, shader);
1186 }
1187
1188
1189 void GLAPIENTRY
1190 _mesa_AttachShader(GLuint program, GLuint shader)
1191 {
1192    GET_CURRENT_CONTEXT(ctx);
1193    attach_shader(ctx, program, shader);
1194 }
1195
1196
1197 void GLAPIENTRY
1198 _mesa_BindAttribLocationARB(GLhandleARB program, GLuint index,
1199                             const GLcharARB *name)
1200 {
1201    GET_CURRENT_CONTEXT(ctx);
1202    bind_attrib_location(ctx, program, index, name);
1203 }
1204
1205
1206 /* GL_EXT_gpu_shader4, GL3 */
1207 void GLAPIENTRY
1208 _mesa_BindFragDataLocation(GLuint program, GLuint colorNumber,
1209                            const GLchar *name)
1210 {
1211    GET_CURRENT_CONTEXT(ctx);
1212    bind_frag_data_location(ctx, program, colorNumber, name);
1213 }
1214
1215
1216 void GLAPIENTRY
1217 _mesa_CompileShaderARB(GLhandleARB shaderObj)
1218 {
1219    GET_CURRENT_CONTEXT(ctx);
1220    compile_shader(ctx, shaderObj);
1221 }
1222
1223
1224 GLuint GLAPIENTRY
1225 _mesa_CreateShader(GLenum type)
1226 {
1227    GET_CURRENT_CONTEXT(ctx);
1228    return create_shader(ctx, type);
1229 }
1230
1231
1232 GLhandleARB GLAPIENTRY
1233 _mesa_CreateShaderObjectARB(GLenum type)
1234 {
1235    GET_CURRENT_CONTEXT(ctx);
1236    return create_shader(ctx, type);
1237 }
1238
1239
1240 GLuint GLAPIENTRY
1241 _mesa_CreateProgram(void)
1242 {
1243    GET_CURRENT_CONTEXT(ctx);
1244    return create_shader_program(ctx);
1245 }
1246
1247
1248 GLhandleARB GLAPIENTRY
1249 _mesa_CreateProgramObjectARB(void)
1250 {
1251    GET_CURRENT_CONTEXT(ctx);
1252    return create_shader_program(ctx);
1253 }
1254
1255
1256 void GLAPIENTRY
1257 _mesa_DeleteObjectARB(GLhandleARB obj)
1258 {
1259    if (obj) {
1260       GET_CURRENT_CONTEXT(ctx);
1261       if (is_program(ctx, obj)) {
1262          delete_shader_program(ctx, obj);
1263       }
1264       else if (is_shader(ctx, obj)) {
1265          delete_shader(ctx, obj);
1266       }
1267       else {
1268          /* error? */
1269       }
1270    }
1271 }
1272
1273
1274 void GLAPIENTRY
1275 _mesa_DeleteProgram(GLuint name)
1276 {
1277    if (name) {
1278       GET_CURRENT_CONTEXT(ctx);
1279       delete_shader_program(ctx, name);
1280    }
1281 }
1282
1283
1284 void GLAPIENTRY
1285 _mesa_DeleteShader(GLuint name)
1286 {
1287    if (name) {
1288       GET_CURRENT_CONTEXT(ctx);
1289       delete_shader(ctx, name);
1290    }
1291 }
1292
1293
1294 void GLAPIENTRY
1295 _mesa_DetachObjectARB(GLhandleARB program, GLhandleARB shader)
1296 {
1297    GET_CURRENT_CONTEXT(ctx);
1298    detach_shader(ctx, program, shader);
1299 }
1300
1301
1302 void GLAPIENTRY
1303 _mesa_DetachShader(GLuint program, GLuint shader)
1304 {
1305    GET_CURRENT_CONTEXT(ctx);
1306    detach_shader(ctx, program, shader);
1307 }
1308
1309
1310 void GLAPIENTRY
1311 _mesa_GetActiveAttribARB(GLhandleARB program, GLuint index,
1312                          GLsizei maxLength, GLsizei * length, GLint * size,
1313                          GLenum * type, GLcharARB * name)
1314 {
1315    GET_CURRENT_CONTEXT(ctx);
1316    get_active_attrib(ctx, program, index, maxLength, length, size, type, name);
1317 }
1318
1319
1320 void GLAPIENTRY
1321 _mesa_GetAttachedObjectsARB(GLhandleARB container, GLsizei maxCount,
1322                             GLsizei * count, GLhandleARB * obj)
1323 {
1324    GET_CURRENT_CONTEXT(ctx);
1325    get_attached_shaders(ctx, container, maxCount, count, obj);
1326 }
1327
1328
1329 void GLAPIENTRY
1330 _mesa_GetAttachedShaders(GLuint program, GLsizei maxCount,
1331                          GLsizei *count, GLuint *obj)
1332 {
1333    GET_CURRENT_CONTEXT(ctx);
1334    get_attached_shaders(ctx, program, maxCount, count, obj);
1335 }
1336
1337
1338 GLint GLAPIENTRY
1339 _mesa_GetAttribLocationARB(GLhandleARB program, const GLcharARB * name)
1340 {
1341    GET_CURRENT_CONTEXT(ctx);
1342    return get_attrib_location(ctx, program, name);
1343 }
1344
1345
1346 /* GL_EXT_gpu_shader4, GL3 */
1347 GLint GLAPIENTRY
1348 _mesa_GetFragDataLocation(GLuint program, const GLchar *name)
1349 {
1350    GET_CURRENT_CONTEXT(ctx);
1351    return get_frag_data_location(ctx, program, name);
1352 }
1353
1354
1355
1356 void GLAPIENTRY
1357 _mesa_GetInfoLogARB(GLhandleARB object, GLsizei maxLength, GLsizei * length,
1358                     GLcharARB * infoLog)
1359 {
1360    GET_CURRENT_CONTEXT(ctx);
1361    if (is_program(ctx, object)) {
1362       get_program_info_log(ctx, object, maxLength, length, infoLog);
1363    }
1364    else if (is_shader(ctx, object)) {
1365       get_shader_info_log(ctx, object, maxLength, length, infoLog);
1366    }
1367    else {
1368       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetInfoLogARB");
1369    }
1370 }
1371
1372
1373 void GLAPIENTRY
1374 _mesa_GetObjectParameterivARB(GLhandleARB object, GLenum pname, GLint *params)
1375 {
1376    GET_CURRENT_CONTEXT(ctx);
1377    /* Implement in terms of GetProgramiv, GetShaderiv */
1378    if (is_program(ctx, object)) {
1379       if (pname == GL_OBJECT_TYPE_ARB) {
1380          *params = GL_PROGRAM_OBJECT_ARB;
1381       }
1382       else {
1383          get_programiv(ctx, object, pname, params);
1384       }
1385    }
1386    else if (is_shader(ctx, object)) {
1387       if (pname == GL_OBJECT_TYPE_ARB) {
1388          *params = GL_SHADER_OBJECT_ARB;
1389       }
1390       else {
1391          get_shaderiv(ctx, object, pname, params);
1392       }
1393    }
1394    else {
1395       _mesa_error(ctx, GL_INVALID_VALUE, "glGetObjectParameterivARB");
1396    }
1397 }
1398
1399
1400 void GLAPIENTRY
1401 _mesa_GetObjectParameterfvARB(GLhandleARB object, GLenum pname,
1402                               GLfloat *params)
1403 {
1404    GLint iparams[1];  /* XXX is one element enough? */
1405    _mesa_GetObjectParameterivARB(object, pname, iparams);
1406    params[0] = (GLfloat) iparams[0];
1407 }
1408
1409
1410 void GLAPIENTRY
1411 _mesa_GetProgramiv(GLuint program, GLenum pname, GLint *params)
1412 {
1413    GET_CURRENT_CONTEXT(ctx);
1414    get_programiv(ctx, program, pname, params);
1415 }
1416
1417
1418 void GLAPIENTRY
1419 _mesa_GetShaderiv(GLuint shader, GLenum pname, GLint *params)
1420 {
1421    GET_CURRENT_CONTEXT(ctx);
1422    get_shaderiv(ctx, shader, pname, params);
1423 }
1424
1425
1426 void GLAPIENTRY
1427 _mesa_GetProgramInfoLog(GLuint program, GLsizei bufSize,
1428                         GLsizei *length, GLchar *infoLog)
1429 {
1430    GET_CURRENT_CONTEXT(ctx);
1431    get_program_info_log(ctx, program, bufSize, length, infoLog);
1432 }
1433
1434
1435 void GLAPIENTRY
1436 _mesa_GetShaderInfoLog(GLuint shader, GLsizei bufSize,
1437                        GLsizei *length, GLchar *infoLog)
1438 {
1439    GET_CURRENT_CONTEXT(ctx);
1440    get_shader_info_log(ctx, shader, bufSize, length, infoLog);
1441 }
1442
1443
1444 void GLAPIENTRY
1445 _mesa_GetShaderSourceARB(GLhandleARB shader, GLsizei maxLength,
1446                          GLsizei *length, GLcharARB *sourceOut)
1447 {
1448    GET_CURRENT_CONTEXT(ctx);
1449    get_shader_source(ctx, shader, maxLength, length, sourceOut);
1450 }
1451
1452
1453 GLhandleARB GLAPIENTRY
1454 _mesa_GetHandleARB(GLenum pname)
1455 {
1456    GET_CURRENT_CONTEXT(ctx);
1457    return get_handle(ctx, pname);
1458 }
1459
1460
1461 GLboolean GLAPIENTRY
1462 _mesa_IsProgram(GLuint name)
1463 {
1464    GET_CURRENT_CONTEXT(ctx);
1465    return is_program(ctx, name);
1466 }
1467
1468
1469 GLboolean GLAPIENTRY
1470 _mesa_IsShader(GLuint name)
1471 {
1472    GET_CURRENT_CONTEXT(ctx);
1473    return is_shader(ctx, name);
1474 }
1475
1476
1477 void GLAPIENTRY
1478 _mesa_LinkProgramARB(GLhandleARB programObj)
1479 {
1480    GET_CURRENT_CONTEXT(ctx);
1481    link_program(ctx, programObj);
1482 }
1483
1484
1485
1486 /**
1487  * Read shader source code from a file.
1488  * Useful for debugging to override an app's shader.
1489  */
1490 static GLcharARB *
1491 read_shader(const char *fname)
1492 {
1493    const int max = 50*1000;
1494    FILE *f = fopen(fname, "r");
1495    GLcharARB *buffer, *shader;
1496    int len;
1497
1498    if (!f) {
1499       return NULL;
1500    }
1501
1502    buffer = (char *) malloc(max);
1503    len = fread(buffer, 1, max, f);
1504    buffer[len] = 0;
1505
1506    fclose(f);
1507
1508    shader = _mesa_strdup(buffer);
1509    free(buffer);
1510
1511    return shader;
1512 }
1513
1514
1515 /**
1516  * Called via glShaderSource() and glShaderSourceARB() API functions.
1517  * Basically, concatenate the source code strings into one long string
1518  * and pass it to _mesa_shader_source().
1519  */
1520 void GLAPIENTRY
1521 _mesa_ShaderSourceARB(GLhandleARB shaderObj, GLsizei count,
1522                       const GLcharARB ** string, const GLint * length)
1523 {
1524    GET_CURRENT_CONTEXT(ctx);
1525    GLint *offsets;
1526    GLsizei i, totalLength;
1527    GLcharARB *source;
1528    GLuint checksum;
1529
1530    if (!shaderObj || string == NULL) {
1531       _mesa_error(ctx, GL_INVALID_VALUE, "glShaderSourceARB");
1532       return;
1533    }
1534
1535    /*
1536     * This array holds offsets of where the appropriate string ends, thus the
1537     * last element will be set to the total length of the source code.
1538     */
1539    offsets = (GLint *) malloc(count * sizeof(GLint));
1540    if (offsets == NULL) {
1541       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
1542       return;
1543    }
1544
1545    for (i = 0; i < count; i++) {
1546       if (string[i] == NULL) {
1547          free((GLvoid *) offsets);
1548          _mesa_error(ctx, GL_INVALID_OPERATION, "glShaderSourceARB(null string)");
1549          return;
1550       }
1551       if (length == NULL || length[i] < 0)
1552          offsets[i] = strlen(string[i]);
1553       else
1554          offsets[i] = length[i];
1555       /* accumulate string lengths */
1556       if (i > 0)
1557          offsets[i] += offsets[i - 1];
1558    }
1559
1560    /* Total length of source string is sum off all strings plus two.
1561     * One extra byte for terminating zero, another extra byte to silence
1562     * valgrind warnings in the parser/grammer code.
1563     */
1564    totalLength = offsets[count - 1] + 2;
1565    source = (GLcharARB *) malloc(totalLength * sizeof(GLcharARB));
1566    if (source == NULL) {
1567       free((GLvoid *) offsets);
1568       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
1569       return;
1570    }
1571
1572    for (i = 0; i < count; i++) {
1573       GLint start = (i > 0) ? offsets[i - 1] : 0;
1574       memcpy(source + start, string[i],
1575              (offsets[i] - start) * sizeof(GLcharARB));
1576    }
1577    source[totalLength - 1] = '\0';
1578    source[totalLength - 2] = '\0';
1579
1580    if (SHADER_SUBST) {
1581       /* Compute the shader's source code checksum then try to open a file
1582        * named newshader_<CHECKSUM>.  If it exists, use it in place of the
1583        * original shader source code.  For debugging.
1584        */
1585       char filename[100];
1586       GLcharARB *newSource;
1587
1588       checksum = _mesa_str_checksum(source);
1589
1590       _mesa_snprintf(filename, sizeof(filename), "newshader_%d", checksum);
1591
1592       newSource = read_shader(filename);
1593       if (newSource) {
1594          fprintf(stderr, "Mesa: Replacing shader %u chksum=%d with %s\n",
1595                        shaderObj, checksum, filename);
1596          free(source);
1597          source = newSource;
1598       }
1599    }
1600
1601    shader_source(ctx, shaderObj, source);
1602
1603    if (SHADER_SUBST) {
1604       struct gl_shader *sh = _mesa_lookup_shader(ctx, shaderObj);
1605       if (sh)
1606          sh->SourceChecksum = checksum; /* save original checksum */
1607    }
1608
1609    free(offsets);
1610 }
1611
1612
1613 void GLAPIENTRY
1614 _mesa_UseProgramObjectARB(GLhandleARB program)
1615 {
1616    GET_CURRENT_CONTEXT(ctx);
1617    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
1618    _mesa_use_program(ctx, program);
1619 }
1620
1621
1622 void GLAPIENTRY
1623 _mesa_ValidateProgramARB(GLhandleARB program)
1624 {
1625    GET_CURRENT_CONTEXT(ctx);
1626    validate_program(ctx, program);
1627 }
1628
1629 #ifdef FEATURE_ES2
1630
1631 void GLAPIENTRY
1632 _mesa_GetShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype,
1633                                GLint* range, GLint* precision)
1634 {
1635    GET_CURRENT_CONTEXT(ctx);
1636    (void) shadertype;
1637    (void) precisiontype;
1638    (void) range;
1639    (void) precision;
1640    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
1641 }
1642
1643
1644 void GLAPIENTRY
1645 _mesa_ReleaseShaderCompiler(void)
1646 {
1647    GET_CURRENT_CONTEXT(ctx);
1648    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
1649 }
1650
1651
1652 void GLAPIENTRY
1653 _mesa_ShaderBinary(GLint n, const GLuint* shaders, GLenum binaryformat,
1654                    const void* binary, GLint length)
1655 {
1656    GET_CURRENT_CONTEXT(ctx);
1657    (void) n;
1658    (void) shaders;
1659    (void) binaryformat;
1660    (void) binary;
1661    (void) length;
1662    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
1663 }
1664
1665 #endif /* FEATURE_ES2 */
1666
1667
1668 #if FEATURE_ARB_geometry_shader4
1669
1670 void GLAPIENTRY
1671 _mesa_ProgramParameteriARB(GLuint program, GLenum pname,
1672                            GLint value)
1673 {
1674    struct gl_shader_program *shProg;
1675    GET_CURRENT_CONTEXT(ctx);
1676
1677    ASSERT_OUTSIDE_BEGIN_END(ctx);
1678
1679    shProg = _mesa_lookup_shader_program_err(ctx, program,
1680                                             "glProgramParameteri");
1681    if (!shProg)
1682       return;
1683
1684    switch (pname) {
1685    case GL_GEOMETRY_VERTICES_OUT_ARB:
1686       if (value < 1 ||
1687           (unsigned) value > ctx->Const.GeometryProgram.MaxGeometryOutputVertices) {
1688          _mesa_error(ctx, GL_INVALID_VALUE,
1689                      "glProgramParameteri(GL_GEOMETRY_VERTICES_OUT_ARB=%d",
1690                      value);
1691          return;
1692       }
1693       shProg->Geom.VerticesOut = value;
1694       break;
1695    case GL_GEOMETRY_INPUT_TYPE_ARB:
1696       switch (value) {
1697       case GL_POINTS:
1698       case GL_LINES:
1699       case GL_LINES_ADJACENCY_ARB:
1700       case GL_TRIANGLES:
1701       case GL_TRIANGLES_ADJACENCY_ARB:
1702          shProg->Geom.InputType = value;
1703          break;
1704       default:
1705          _mesa_error(ctx, GL_INVALID_VALUE,
1706                      "glProgramParameteri(geometry input type = %s",
1707                      _mesa_lookup_enum_by_nr(value));
1708          return;
1709       }
1710       break;
1711    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
1712       switch (value) {
1713       case GL_POINTS:
1714       case GL_LINE_STRIP:
1715       case GL_TRIANGLE_STRIP:
1716          shProg->Geom.OutputType = value;
1717          break;
1718       default:
1719          _mesa_error(ctx, GL_INVALID_VALUE,
1720                      "glProgramParameteri(geometry output type = %s",
1721                      _mesa_lookup_enum_by_nr(value));
1722          return;
1723       }
1724       break;
1725    default:
1726       _mesa_error(ctx, GL_INVALID_ENUM, "glProgramParameteriARB(pname=%s)",
1727                   _mesa_lookup_enum_by_nr(pname));
1728       break;
1729    }
1730 }
1731
1732 #endif
1733
1734 void GLAPIENTRY
1735 _mesa_UseShaderProgramEXT(GLenum type, GLuint program)
1736 {
1737    GET_CURRENT_CONTEXT(ctx);
1738    struct gl_shader_program *shProg = NULL;
1739    bool changed = false;
1740
1741    if (!validate_shader_target(ctx, type)) {
1742       _mesa_error(ctx, GL_INVALID_ENUM, "glUseShaderProgramEXT(type)");
1743       return;
1744    }
1745
1746    if (ctx->TransformFeedback.CurrentObject->Active) {
1747       _mesa_error(ctx, GL_INVALID_OPERATION,
1748                   "glUseShaderProgramEXT(transform feedback is active)");
1749       return;
1750    }
1751
1752    if (program) {
1753       shProg = _mesa_lookup_shader_program_err(ctx, program,
1754                                                "glUseShaderProgramEXT");
1755       if (shProg == NULL)
1756          return;
1757
1758       if (!shProg->LinkStatus) {
1759          _mesa_error(ctx, GL_INVALID_OPERATION,
1760                      "glUseShaderProgramEXT(program not linked)");
1761          return;
1762       }
1763    }
1764
1765    changed = use_shader_program(ctx, type, shProg);
1766    if (changed)
1767       FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
1768
1769    if (ctx->Driver.UseProgram)
1770       ctx->Driver.UseProgram(ctx, shProg);
1771    return;
1772 }
1773
1774 void GLAPIENTRY
1775 _mesa_ActiveProgramEXT(GLuint program)
1776 {
1777    GET_CURRENT_CONTEXT(ctx);
1778    struct gl_shader_program *shProg = (program != 0)
1779       ? _mesa_lookup_shader_program_err(ctx, program, "glActiveProgramEXT")
1780       : NULL;
1781
1782    active_program(ctx, shProg, "glActiveProgramEXT");
1783    return;
1784 }
1785
1786 GLuint GLAPIENTRY
1787 _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string)
1788 {
1789    GET_CURRENT_CONTEXT(ctx);
1790    const GLuint shader = create_shader(ctx, type);
1791    GLuint program = 0;
1792
1793    if (shader) {
1794       shader_source(ctx, shader, _mesa_strdup(string));
1795       compile_shader(ctx, shader);
1796
1797       program = create_shader_program(ctx);
1798       if (program) {
1799          struct gl_shader_program *shProg;
1800          struct gl_shader *sh;
1801          GLint compiled = GL_FALSE;
1802
1803          shProg = _mesa_lookup_shader_program(ctx, program);
1804          sh = _mesa_lookup_shader(ctx, shader);
1805
1806          get_shaderiv(ctx, shader, GL_COMPILE_STATUS, &compiled);
1807          if (compiled) {
1808             attach_shader(ctx, program, shader);
1809             link_program(ctx, program);
1810             detach_shader(ctx, program, shader);
1811
1812 #if 0
1813             /* Possibly... */
1814             if (active-user-defined-varyings-in-linked-program) {
1815                append-error-to-info-log;
1816                shProg->LinkStatus = GL_FALSE;
1817             }
1818 #endif
1819          }
1820
1821          shProg->InfoLog = talloc_strdup_append(shProg->InfoLog, sh->InfoLog);
1822       }
1823
1824       delete_shader(ctx, shader);
1825    }
1826
1827    return program;
1828 }
1829
1830 /**
1831  * Plug in shader-related functions into API dispatch table.
1832  */
1833 void
1834 _mesa_init_shader_dispatch(struct _glapi_table *exec)
1835 {
1836 #if FEATURE_GL
1837    /* GL_ARB_vertex/fragment_shader */
1838    SET_DeleteObjectARB(exec, _mesa_DeleteObjectARB);
1839    SET_GetHandleARB(exec, _mesa_GetHandleARB);
1840    SET_DetachObjectARB(exec, _mesa_DetachObjectARB);
1841    SET_CreateShaderObjectARB(exec, _mesa_CreateShaderObjectARB);
1842    SET_ShaderSourceARB(exec, _mesa_ShaderSourceARB);
1843    SET_CompileShaderARB(exec, _mesa_CompileShaderARB);
1844    SET_CreateProgramObjectARB(exec, _mesa_CreateProgramObjectARB);
1845    SET_AttachObjectARB(exec, _mesa_AttachObjectARB);
1846    SET_LinkProgramARB(exec, _mesa_LinkProgramARB);
1847    SET_UseProgramObjectARB(exec, _mesa_UseProgramObjectARB);
1848    SET_ValidateProgramARB(exec, _mesa_ValidateProgramARB);
1849    SET_GetObjectParameterfvARB(exec, _mesa_GetObjectParameterfvARB);
1850    SET_GetObjectParameterivARB(exec, _mesa_GetObjectParameterivARB);
1851    SET_GetInfoLogARB(exec, _mesa_GetInfoLogARB);
1852    SET_GetAttachedObjectsARB(exec, _mesa_GetAttachedObjectsARB);
1853    SET_GetShaderSourceARB(exec, _mesa_GetShaderSourceARB);
1854
1855    /* OpenGL 2.0 */
1856    SET_AttachShader(exec, _mesa_AttachShader);
1857    SET_CreateProgram(exec, _mesa_CreateProgram);
1858    SET_CreateShader(exec, _mesa_CreateShader);
1859    SET_DeleteProgram(exec, _mesa_DeleteProgram);
1860    SET_DeleteShader(exec, _mesa_DeleteShader);
1861    SET_DetachShader(exec, _mesa_DetachShader);
1862    SET_GetAttachedShaders(exec, _mesa_GetAttachedShaders);
1863    SET_GetProgramiv(exec, _mesa_GetProgramiv);
1864    SET_GetProgramInfoLog(exec, _mesa_GetProgramInfoLog);
1865    SET_GetShaderiv(exec, _mesa_GetShaderiv);
1866    SET_GetShaderInfoLog(exec, _mesa_GetShaderInfoLog);
1867    SET_IsProgram(exec, _mesa_IsProgram);
1868    SET_IsShader(exec, _mesa_IsShader);
1869
1870 #if FEATURE_ARB_vertex_shader
1871    SET_BindAttribLocationARB(exec, _mesa_BindAttribLocationARB);
1872    SET_GetActiveAttribARB(exec, _mesa_GetActiveAttribARB);
1873    SET_GetAttribLocationARB(exec, _mesa_GetAttribLocationARB);
1874 #endif
1875
1876 #if FEATURE_ARB_geometry_shader4
1877    SET_ProgramParameteriARB(exec, _mesa_ProgramParameteriARB);
1878 #endif
1879
1880    SET_UseShaderProgramEXT(exec, _mesa_UseShaderProgramEXT);
1881    SET_ActiveProgramEXT(exec, _mesa_ActiveProgramEXT);
1882    SET_CreateShaderProgramEXT(exec, _mesa_CreateShaderProgramEXT);
1883
1884    /* GL_EXT_gpu_shader4 / GL 3.0 */
1885    SET_BindFragDataLocationEXT(exec, _mesa_BindFragDataLocation);
1886    SET_GetFragDataLocationEXT(exec, _mesa_GetFragDataLocation);
1887
1888 #endif /* FEATURE_GL */
1889 }
1890