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 void
 940 _mesa_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       FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
 996       _mesa_reference_shader_program(ctx, target, shProg);
 997       return true;
 998    }
 999
1000    return false;
1001 }
1002
1003 /**
1004  * Use the named shader program for subsequent rendering.
1005  */
1006 void
1007 _mesa_use_program(struct gl_context *ctx, struct gl_shader_program *shProg)
1008 {
1009    use_shader_program(ctx, GL_VERTEX_SHADER, shProg);
1010    use_shader_program(ctx, GL_GEOMETRY_SHADER_ARB, shProg);
1011    use_shader_program(ctx, GL_FRAGMENT_SHADER, shProg);
1012    _mesa_active_program(ctx, shProg, "glUseProgram");
1013
1014    if (ctx->Driver.UseProgram)
1015       ctx->Driver.UseProgram(ctx, shProg);
1016 }
1017
1018
1019 /**
1020  * Validate a program's samplers.
1021  * Specifically, check that there aren't two samplers of different types
1022  * pointing to the same texture unit.
1023  * \return GL_TRUE if valid, GL_FALSE if invalid
1024  */
1025 static GLboolean
1026 validate_samplers(const struct gl_program *prog, char *errMsg)
1027 {
1028    static const char *targetName[] = {
1029       "TEXTURE_2D_ARRAY",
1030       "TEXTURE_1D_ARRAY",
1031       "TEXTURE_CUBE",
1032       "TEXTURE_3D",
1033       "TEXTURE_RECT",
1034       "TEXTURE_2D",
1035       "TEXTURE_1D",
1036    };
1037    GLint targetUsed[MAX_TEXTURE_IMAGE_UNITS];
1038    GLbitfield samplersUsed = prog->SamplersUsed;
1039    GLuint i;
1040
1041    assert(Elements(targetName) == NUM_TEXTURE_TARGETS);
1042
1043    if (samplersUsed == 0x0)
1044       return GL_TRUE;
1045
1046    for (i = 0; i < Elements(targetUsed); i++)
1047       targetUsed[i] = -1;
1048
1049    /* walk over bits which are set in 'samplers' */
1050    while (samplersUsed) {
1051       GLuint unit;
1052       gl_texture_index target;
1053       GLint sampler = _mesa_ffs(samplersUsed) - 1;
1054       assert(sampler >= 0);
1055       assert(sampler < MAX_TEXTURE_IMAGE_UNITS);
1056       unit = prog->SamplerUnits[sampler];
1057       target = prog->SamplerTargets[sampler];
1058       if (targetUsed[unit] != -1 && targetUsed[unit] != (int) target) {
1059          _mesa_snprintf(errMsg, 100,
1060                   "Texture unit %d is accessed both as %s and %s",
1061                   unit, targetName[targetUsed[unit]], targetName[target]);
1062          return GL_FALSE;
1063       }
1064       targetUsed[unit] = target;
1065       samplersUsed ^= (1 << sampler);
1066    }
1067
1068    return GL_TRUE;
1069 }
1070
1071
1072 /**
1073  * Do validation of the given shader program.
1074  * \param errMsg  returns error message if validation fails.
1075  * \return GL_TRUE if valid, GL_FALSE if invalid (and set errMsg)
1076  */
1077 static GLboolean
1078 validate_shader_program(const struct gl_shader_program *shProg,
1079                         char *errMsg)
1080 {
1081    const struct gl_vertex_program *vp = shProg->VertexProgram;
1082    const struct gl_fragment_program *fp = shProg->FragmentProgram;
1083
1084    if (!shProg->LinkStatus) {
1085       return GL_FALSE;
1086    }
1087
1088    /* From the GL spec, a program is invalid if any of these are true:
1089
1090      any two active samplers in the current program object are of
1091      different types, but refer to the same texture image unit,
1092
1093      any active sampler in the current program object refers to a texture
1094      image unit where fixed-function fragment processing accesses a
1095      texture target that does not match the sampler type, or
1096
1097      the sum of the number of active samplers in the program and the
1098      number of texture image units enabled for fixed-function fragment
1099      processing exceeds the combined limit on the total number of texture
1100      image units allowed.
1101    */
1102
1103
1104    /*
1105     * Check: any two active samplers in the current program object are of
1106     * different types, but refer to the same texture image unit,
1107     */
1108    if (vp && !validate_samplers(&vp->Base, errMsg)) {
1109       return GL_FALSE;
1110    }
1111    if (fp && !validate_samplers(&fp->Base, errMsg)) {
1112       return GL_FALSE;
1113    }
1114
1115    return GL_TRUE;
1116 }
1117
1118
1119 /**
1120  * Called via glValidateProgram()
1121  */
1122 static void
1123 validate_program(struct gl_context *ctx, GLuint program)
1124 {
1125    struct gl_shader_program *shProg;
1126    char errMsg[100];
1127
1128    shProg = _mesa_lookup_shader_program_err(ctx, program, "glValidateProgram");
1129    if (!shProg) {
1130       return;
1131    }
1132
1133    shProg->Validated = validate_shader_program(shProg, errMsg);
1134    if (!shProg->Validated) {
1135       /* update info log */
1136       if (shProg->InfoLog) {
1137          talloc_free(shProg->InfoLog);
1138       }
1139       shProg->InfoLog = talloc_strdup(shProg, errMsg);
1140    }
1141 }
1142
1143
1144
1145 void GLAPIENTRY
1146 _mesa_AttachObjectARB(GLhandleARB program, GLhandleARB shader)
1147 {
1148    GET_CURRENT_CONTEXT(ctx);
1149    attach_shader(ctx, program, shader);
1150 }
1151
1152
1153 void GLAPIENTRY
1154 _mesa_AttachShader(GLuint program, GLuint shader)
1155 {
1156    GET_CURRENT_CONTEXT(ctx);
1157    attach_shader(ctx, program, shader);
1158 }
1159
1160
1161 void GLAPIENTRY
1162 _mesa_BindAttribLocationARB(GLhandleARB program, GLuint index,
1163                             const GLcharARB *name)
1164 {
1165    GET_CURRENT_CONTEXT(ctx);
1166    bind_attrib_location(ctx, program, index, name);
1167 }
1168
1169
1170 /* GL_EXT_gpu_shader4, GL3 */
1171 void GLAPIENTRY
1172 _mesa_BindFragDataLocation(GLuint program, GLuint colorNumber,
1173                            const GLchar *name)
1174 {
1175    GET_CURRENT_CONTEXT(ctx);
1176    bind_frag_data_location(ctx, program, colorNumber, name);
1177 }
1178
1179
1180 void GLAPIENTRY
1181 _mesa_CompileShaderARB(GLhandleARB shaderObj)
1182 {
1183    GET_CURRENT_CONTEXT(ctx);
1184    compile_shader(ctx, shaderObj);
1185 }
1186
1187
1188 GLuint GLAPIENTRY
1189 _mesa_CreateShader(GLenum type)
1190 {
1191    GET_CURRENT_CONTEXT(ctx);
1192    return create_shader(ctx, type);
1193 }
1194
1195
1196 GLhandleARB GLAPIENTRY
1197 _mesa_CreateShaderObjectARB(GLenum type)
1198 {
1199    GET_CURRENT_CONTEXT(ctx);
1200    return create_shader(ctx, type);
1201 }
1202
1203
1204 GLuint GLAPIENTRY
1205 _mesa_CreateProgram(void)
1206 {
1207    GET_CURRENT_CONTEXT(ctx);
1208    return create_shader_program(ctx);
1209 }
1210
1211
1212 GLhandleARB GLAPIENTRY
1213 _mesa_CreateProgramObjectARB(void)
1214 {
1215    GET_CURRENT_CONTEXT(ctx);
1216    return create_shader_program(ctx);
1217 }
1218
1219
1220 void GLAPIENTRY
1221 _mesa_DeleteObjectARB(GLhandleARB obj)
1222 {
1223    if (obj) {
1224       GET_CURRENT_CONTEXT(ctx);
1225       if (is_program(ctx, obj)) {
1226          delete_shader_program(ctx, obj);
1227       }
1228       else if (is_shader(ctx, obj)) {
1229          delete_shader(ctx, obj);
1230       }
1231       else {
1232          /* error? */
1233       }
1234    }
1235 }
1236
1237
1238 void GLAPIENTRY
1239 _mesa_DeleteProgram(GLuint name)
1240 {
1241    if (name) {
1242       GET_CURRENT_CONTEXT(ctx);
1243       delete_shader_program(ctx, name);
1244    }
1245 }
1246
1247
1248 void GLAPIENTRY
1249 _mesa_DeleteShader(GLuint name)
1250 {
1251    if (name) {
1252       GET_CURRENT_CONTEXT(ctx);
1253       delete_shader(ctx, name);
1254    }
1255 }
1256
1257
1258 void GLAPIENTRY
1259 _mesa_DetachObjectARB(GLhandleARB program, GLhandleARB shader)
1260 {
1261    GET_CURRENT_CONTEXT(ctx);
1262    detach_shader(ctx, program, shader);
1263 }
1264
1265
1266 void GLAPIENTRY
1267 _mesa_DetachShader(GLuint program, GLuint shader)
1268 {
1269    GET_CURRENT_CONTEXT(ctx);
1270    detach_shader(ctx, program, shader);
1271 }
1272
1273
1274 void GLAPIENTRY
1275 _mesa_GetActiveAttribARB(GLhandleARB program, GLuint index,
1276                          GLsizei maxLength, GLsizei * length, GLint * size,
1277                          GLenum * type, GLcharARB * name)
1278 {
1279    GET_CURRENT_CONTEXT(ctx);
1280    get_active_attrib(ctx, program, index, maxLength, length, size, type, name);
1281 }
1282
1283
1284 void GLAPIENTRY
1285 _mesa_GetAttachedObjectsARB(GLhandleARB container, GLsizei maxCount,
1286                             GLsizei * count, GLhandleARB * obj)
1287 {
1288    GET_CURRENT_CONTEXT(ctx);
1289    get_attached_shaders(ctx, container, maxCount, count, obj);
1290 }
1291
1292
1293 void GLAPIENTRY
1294 _mesa_GetAttachedShaders(GLuint program, GLsizei maxCount,
1295                          GLsizei *count, GLuint *obj)
1296 {
1297    GET_CURRENT_CONTEXT(ctx);
1298    get_attached_shaders(ctx, program, maxCount, count, obj);
1299 }
1300
1301
1302 GLint GLAPIENTRY
1303 _mesa_GetAttribLocationARB(GLhandleARB program, const GLcharARB * name)
1304 {
1305    GET_CURRENT_CONTEXT(ctx);
1306    return get_attrib_location(ctx, program, name);
1307 }
1308
1309
1310 /* GL_EXT_gpu_shader4, GL3 */
1311 GLint GLAPIENTRY
1312 _mesa_GetFragDataLocation(GLuint program, const GLchar *name)
1313 {
1314    GET_CURRENT_CONTEXT(ctx);
1315    return get_frag_data_location(ctx, program, name);
1316 }
1317
1318
1319
1320 void GLAPIENTRY
1321 _mesa_GetInfoLogARB(GLhandleARB object, GLsizei maxLength, GLsizei * length,
1322                     GLcharARB * infoLog)
1323 {
1324    GET_CURRENT_CONTEXT(ctx);
1325    if (is_program(ctx, object)) {
1326       get_program_info_log(ctx, object, maxLength, length, infoLog);
1327    }
1328    else if (is_shader(ctx, object)) {
1329       get_shader_info_log(ctx, object, maxLength, length, infoLog);
1330    }
1331    else {
1332       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetInfoLogARB");
1333    }
1334 }
1335
1336
1337 void GLAPIENTRY
1338 _mesa_GetObjectParameterivARB(GLhandleARB object, GLenum pname, GLint *params)
1339 {
1340    GET_CURRENT_CONTEXT(ctx);
1341    /* Implement in terms of GetProgramiv, GetShaderiv */
1342    if (is_program(ctx, object)) {
1343       if (pname == GL_OBJECT_TYPE_ARB) {
1344          *params = GL_PROGRAM_OBJECT_ARB;
1345       }
1346       else {
1347          get_programiv(ctx, object, pname, params);
1348       }
1349    }
1350    else if (is_shader(ctx, object)) {
1351       if (pname == GL_OBJECT_TYPE_ARB) {
1352          *params = GL_SHADER_OBJECT_ARB;
1353       }
1354       else {
1355          get_shaderiv(ctx, object, pname, params);
1356       }
1357    }
1358    else {
1359       _mesa_error(ctx, GL_INVALID_VALUE, "glGetObjectParameterivARB");
1360    }
1361 }
1362
1363
1364 void GLAPIENTRY
1365 _mesa_GetObjectParameterfvARB(GLhandleARB object, GLenum pname,
1366                               GLfloat *params)
1367 {
1368    GLint iparams[1];  /* XXX is one element enough? */
1369    _mesa_GetObjectParameterivARB(object, pname, iparams);
1370    params[0] = (GLfloat) iparams[0];
1371 }
1372
1373
1374 void GLAPIENTRY
1375 _mesa_GetProgramiv(GLuint program, GLenum pname, GLint *params)
1376 {
1377    GET_CURRENT_CONTEXT(ctx);
1378    get_programiv(ctx, program, pname, params);
1379 }
1380
1381
1382 void GLAPIENTRY
1383 _mesa_GetShaderiv(GLuint shader, GLenum pname, GLint *params)
1384 {
1385    GET_CURRENT_CONTEXT(ctx);
1386    get_shaderiv(ctx, shader, pname, params);
1387 }
1388
1389
1390 void GLAPIENTRY
1391 _mesa_GetProgramInfoLog(GLuint program, GLsizei bufSize,
1392                         GLsizei *length, GLchar *infoLog)
1393 {
1394    GET_CURRENT_CONTEXT(ctx);
1395    get_program_info_log(ctx, program, bufSize, length, infoLog);
1396 }
1397
1398
1399 void GLAPIENTRY
1400 _mesa_GetShaderInfoLog(GLuint shader, GLsizei bufSize,
1401                        GLsizei *length, GLchar *infoLog)
1402 {
1403    GET_CURRENT_CONTEXT(ctx);
1404    get_shader_info_log(ctx, shader, bufSize, length, infoLog);
1405 }
1406
1407
1408 void GLAPIENTRY
1409 _mesa_GetShaderSourceARB(GLhandleARB shader, GLsizei maxLength,
1410                          GLsizei *length, GLcharARB *sourceOut)
1411 {
1412    GET_CURRENT_CONTEXT(ctx);
1413    get_shader_source(ctx, shader, maxLength, length, sourceOut);
1414 }
1415
1416
1417 GLhandleARB GLAPIENTRY
1418 _mesa_GetHandleARB(GLenum pname)
1419 {
1420    GET_CURRENT_CONTEXT(ctx);
1421    return get_handle(ctx, pname);
1422 }
1423
1424
1425 GLboolean GLAPIENTRY
1426 _mesa_IsProgram(GLuint name)
1427 {
1428    GET_CURRENT_CONTEXT(ctx);
1429    return is_program(ctx, name);
1430 }
1431
1432
1433 GLboolean GLAPIENTRY
1434 _mesa_IsShader(GLuint name)
1435 {
1436    GET_CURRENT_CONTEXT(ctx);
1437    return is_shader(ctx, name);
1438 }
1439
1440
1441 void GLAPIENTRY
1442 _mesa_LinkProgramARB(GLhandleARB programObj)
1443 {
1444    GET_CURRENT_CONTEXT(ctx);
1445    link_program(ctx, programObj);
1446 }
1447
1448
1449
1450 /**
1451  * Read shader source code from a file.
1452  * Useful for debugging to override an app's shader.
1453  */
1454 static GLcharARB *
1455 read_shader(const char *fname)
1456 {
1457    const int max = 50*1000;
1458    FILE *f = fopen(fname, "r");
1459    GLcharARB *buffer, *shader;
1460    int len;
1461
1462    if (!f) {
1463       return NULL;
1464    }
1465
1466    buffer = (char *) malloc(max);
1467    len = fread(buffer, 1, max, f);
1468    buffer[len] = 0;
1469
1470    fclose(f);
1471
1472    shader = _mesa_strdup(buffer);
1473    free(buffer);
1474
1475    return shader;
1476 }
1477
1478
1479 /**
1480  * Called via glShaderSource() and glShaderSourceARB() API functions.
1481  * Basically, concatenate the source code strings into one long string
1482  * and pass it to _mesa_shader_source().
1483  */
1484 void GLAPIENTRY
1485 _mesa_ShaderSourceARB(GLhandleARB shaderObj, GLsizei count,
1486                       const GLcharARB ** string, const GLint * length)
1487 {
1488    GET_CURRENT_CONTEXT(ctx);
1489    GLint *offsets;
1490    GLsizei i, totalLength;
1491    GLcharARB *source;
1492    GLuint checksum;
1493
1494    if (!shaderObj || string == NULL) {
1495       _mesa_error(ctx, GL_INVALID_VALUE, "glShaderSourceARB");
1496       return;
1497    }
1498
1499    /*
1500     * This array holds offsets of where the appropriate string ends, thus the
1501     * last element will be set to the total length of the source code.
1502     */
1503    offsets = (GLint *) malloc(count * sizeof(GLint));
1504    if (offsets == NULL) {
1505       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
1506       return;
1507    }
1508
1509    for (i = 0; i < count; i++) {
1510       if (string[i] == NULL) {
1511          free((GLvoid *) offsets);
1512          _mesa_error(ctx, GL_INVALID_OPERATION, "glShaderSourceARB(null string)");
1513          return;
1514       }
1515       if (length == NULL || length[i] < 0)
1516          offsets[i] = strlen(string[i]);
1517       else
1518          offsets[i] = length[i];
1519       /* accumulate string lengths */
1520       if (i > 0)
1521          offsets[i] += offsets[i - 1];
1522    }
1523
1524    /* Total length of source string is sum off all strings plus two.
1525     * One extra byte for terminating zero, another extra byte to silence
1526     * valgrind warnings in the parser/grammer code.
1527     */
1528    totalLength = offsets[count - 1] + 2;
1529    source = (GLcharARB *) malloc(totalLength * sizeof(GLcharARB));
1530    if (source == NULL) {
1531       free((GLvoid *) offsets);
1532       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
1533       return;
1534    }
1535
1536    for (i = 0; i < count; i++) {
1537       GLint start = (i > 0) ? offsets[i - 1] : 0;
1538       memcpy(source + start, string[i],
1539              (offsets[i] - start) * sizeof(GLcharARB));
1540    }
1541    source[totalLength - 1] = '\0';
1542    source[totalLength - 2] = '\0';
1543
1544    if (SHADER_SUBST) {
1545       /* Compute the shader's source code checksum then try to open a file
1546        * named newshader_<CHECKSUM>.  If it exists, use it in place of the
1547        * original shader source code.  For debugging.
1548        */
1549       char filename[100];
1550       GLcharARB *newSource;
1551
1552       checksum = _mesa_str_checksum(source);
1553
1554       _mesa_snprintf(filename, sizeof(filename), "newshader_%d", checksum);
1555
1556       newSource = read_shader(filename);
1557       if (newSource) {
1558          fprintf(stderr, "Mesa: Replacing shader %u chksum=%d with %s\n",
1559                        shaderObj, checksum, filename);
1560          free(source);
1561          source = newSource;
1562       }
1563    }
1564
1565    shader_source(ctx, shaderObj, source);
1566
1567    if (SHADER_SUBST) {
1568       struct gl_shader *sh = _mesa_lookup_shader(ctx, shaderObj);
1569       if (sh)
1570          sh->SourceChecksum = checksum; /* save original checksum */
1571    }
1572
1573    free(offsets);
1574 }
1575
1576
1577 void GLAPIENTRY
1578 _mesa_UseProgramObjectARB(GLhandleARB program)
1579 {
1580    GET_CURRENT_CONTEXT(ctx);
1581    struct gl_shader_program *shProg;
1582    struct gl_transform_feedback_object *obj =
1583       ctx->TransformFeedback.CurrentObject;
1584
1585    if (obj->Active) {
1586       _mesa_error(ctx, GL_INVALID_OPERATION,
1587                   "glUseProgram(transform feedback active)");
1588       return;
1589    }
1590
1591    if (program) {
1592       shProg = _mesa_lookup_shader_program_err(ctx, program, "glUseProgram");
1593       if (!shProg) {
1594          return;
1595       }
1596       if (!shProg->LinkStatus) {
1597          _mesa_error(ctx, GL_INVALID_OPERATION,
1598                      "glUseProgram(program %u not linked)", program);
1599          return;
1600       }
1601
1602       /* debug code */
1603       if (ctx->Shader.Flags & GLSL_USE_PROG) {
1604          print_shader_info(shProg);
1605       }
1606    }
1607    else {
1608       shProg = NULL;
1609    }
1610
1611    _mesa_use_program(ctx, shProg);
1612 }
1613
1614
1615 void GLAPIENTRY
1616 _mesa_ValidateProgramARB(GLhandleARB program)
1617 {
1618    GET_CURRENT_CONTEXT(ctx);
1619    validate_program(ctx, program);
1620 }
1621
1622 #ifdef FEATURE_ES2
1623
1624 void GLAPIENTRY
1625 _mesa_GetShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype,
1626                                GLint* range, GLint* precision)
1627 {
1628    GET_CURRENT_CONTEXT(ctx);
1629    (void) shadertype;
1630    (void) precisiontype;
1631    (void) range;
1632    (void) precision;
1633    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
1634 }
1635
1636
1637 void GLAPIENTRY
1638 _mesa_ReleaseShaderCompiler(void)
1639 {
1640    GET_CURRENT_CONTEXT(ctx);
1641    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
1642 }
1643
1644
1645 void GLAPIENTRY
1646 _mesa_ShaderBinary(GLint n, const GLuint* shaders, GLenum binaryformat,
1647                    const void* binary, GLint length)
1648 {
1649    GET_CURRENT_CONTEXT(ctx);
1650    (void) n;
1651    (void) shaders;
1652    (void) binaryformat;
1653    (void) binary;
1654    (void) length;
1655    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
1656 }
1657
1658 #endif /* FEATURE_ES2 */
1659
1660
1661 #if FEATURE_ARB_geometry_shader4
1662
1663 void GLAPIENTRY
1664 _mesa_ProgramParameteriARB(GLuint program, GLenum pname,
1665                            GLint value)
1666 {
1667    struct gl_shader_program *shProg;
1668    GET_CURRENT_CONTEXT(ctx);
1669
1670    ASSERT_OUTSIDE_BEGIN_END(ctx);
1671
1672    shProg = _mesa_lookup_shader_program_err(ctx, program,
1673                                             "glProgramParameteri");
1674    if (!shProg)
1675       return;
1676
1677    switch (pname) {
1678    case GL_GEOMETRY_VERTICES_OUT_ARB:
1679       if (value < 1 ||
1680           (unsigned) value > ctx->Const.GeometryProgram.MaxGeometryOutputVertices) {
1681          _mesa_error(ctx, GL_INVALID_VALUE,
1682                      "glProgramParameteri(GL_GEOMETRY_VERTICES_OUT_ARB=%d",
1683                      value);
1684          return;
1685       }
1686       shProg->Geom.VerticesOut = value;
1687       break;
1688    case GL_GEOMETRY_INPUT_TYPE_ARB:
1689       switch (value) {
1690       case GL_POINTS:
1691       case GL_LINES:
1692       case GL_LINES_ADJACENCY_ARB:
1693       case GL_TRIANGLES:
1694       case GL_TRIANGLES_ADJACENCY_ARB:
1695          shProg->Geom.InputType = value;
1696          break;
1697       default:
1698          _mesa_error(ctx, GL_INVALID_VALUE,
1699                      "glProgramParameteri(geometry input type = %s",
1700                      _mesa_lookup_enum_by_nr(value));
1701          return;
1702       }
1703       break;
1704    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
1705       switch (value) {
1706       case GL_POINTS:
1707       case GL_LINE_STRIP:
1708       case GL_TRIANGLE_STRIP:
1709          shProg->Geom.OutputType = value;
1710          break;
1711       default:
1712          _mesa_error(ctx, GL_INVALID_VALUE,
1713                      "glProgramParameteri(geometry output type = %s",
1714                      _mesa_lookup_enum_by_nr(value));
1715          return;
1716       }
1717       break;
1718    default:
1719       _mesa_error(ctx, GL_INVALID_ENUM, "glProgramParameteriARB(pname=%s)",
1720                   _mesa_lookup_enum_by_nr(pname));
1721       break;
1722    }
1723 }
1724
1725 #endif
1726
1727 void
1728 _mesa_use_shader_program(struct gl_context *ctx, GLenum type,
1729                          struct gl_shader_program *shProg)
1730 {
1731    use_shader_program(ctx, type, shProg);
1732
1733    if (ctx->Driver.UseProgram)
1734       ctx->Driver.UseProgram(ctx, shProg);
1735 }
1736
1737 void GLAPIENTRY
1738 _mesa_UseShaderProgramEXT(GLenum type, GLuint program)
1739 {
1740    GET_CURRENT_CONTEXT(ctx);
1741    struct gl_shader_program *shProg = NULL;
1742
1743    if (!validate_shader_target(ctx, type)) {
1744       _mesa_error(ctx, GL_INVALID_ENUM, "glUseShaderProgramEXT(type)");
1745       return;
1746    }
1747
1748    if (ctx->TransformFeedback.CurrentObject->Active) {
1749       _mesa_error(ctx, GL_INVALID_OPERATION,
1750                   "glUseShaderProgramEXT(transform feedback is active)");
1751       return;
1752    }
1753
1754    if (program) {
1755       shProg = _mesa_lookup_shader_program_err(ctx, program,
1756                                                "glUseShaderProgramEXT");
1757       if (shProg == NULL)
1758          return;
1759
1760       if (!shProg->LinkStatus) {
1761          _mesa_error(ctx, GL_INVALID_OPERATION,
1762                      "glUseShaderProgramEXT(program not linked)");
1763          return;
1764       }
1765    }
1766
1767    _mesa_use_shader_program(ctx, type, shProg);
1768 }
1769
1770 void GLAPIENTRY
1771 _mesa_ActiveProgramEXT(GLuint program)
1772 {
1773    GET_CURRENT_CONTEXT(ctx);
1774    struct gl_shader_program *shProg = (program != 0)
1775       ? _mesa_lookup_shader_program_err(ctx, program, "glActiveProgramEXT")
1776       : NULL;
1777
1778    _mesa_active_program(ctx, shProg, "glActiveProgramEXT");
1779    return;
1780 }
1781
1782 GLuint GLAPIENTRY
1783 _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string)
1784 {
1785    GET_CURRENT_CONTEXT(ctx);
1786    const GLuint shader = create_shader(ctx, type);
1787    GLuint program = 0;
1788
1789    if (shader) {
1790       shader_source(ctx, shader, _mesa_strdup(string));
1791       compile_shader(ctx, shader);
1792
1793       program = create_shader_program(ctx);
1794       if (program) {
1795          struct gl_shader_program *shProg;
1796          struct gl_shader *sh;
1797          GLint compiled = GL_FALSE;
1798
1799          shProg = _mesa_lookup_shader_program(ctx, program);
1800          sh = _mesa_lookup_shader(ctx, shader);
1801
1802          get_shaderiv(ctx, shader, GL_COMPILE_STATUS, &compiled);
1803          if (compiled) {
1804             attach_shader(ctx, program, shader);
1805             link_program(ctx, program);
1806             detach_shader(ctx, program, shader);
1807
1808 #if 0
1809             /* Possibly... */
1810             if (active-user-defined-varyings-in-linked-program) {
1811                append-error-to-info-log;
1812                shProg->LinkStatus = GL_FALSE;
1813             }
1814 #endif
1815          }
1816
1817          shProg->InfoLog = talloc_strdup_append(shProg->InfoLog, sh->InfoLog);
1818       }
1819
1820       delete_shader(ctx, shader);
1821    }
1822
1823    return program;
1824 }
1825
1826 /**
1827  * Plug in shader-related functions into API dispatch table.
1828  */
1829 void
1830 _mesa_init_shader_dispatch(struct _glapi_table *exec)
1831 {
1832 #if FEATURE_GL
1833    /* GL_ARB_vertex/fragment_shader */
1834    SET_DeleteObjectARB(exec, _mesa_DeleteObjectARB);
1835    SET_GetHandleARB(exec, _mesa_GetHandleARB);
1836    SET_DetachObjectARB(exec, _mesa_DetachObjectARB);
1837    SET_CreateShaderObjectARB(exec, _mesa_CreateShaderObjectARB);
1838    SET_ShaderSourceARB(exec, _mesa_ShaderSourceARB);
1839    SET_CompileShaderARB(exec, _mesa_CompileShaderARB);
1840    SET_CreateProgramObjectARB(exec, _mesa_CreateProgramObjectARB);
1841    SET_AttachObjectARB(exec, _mesa_AttachObjectARB);
1842    SET_LinkProgramARB(exec, _mesa_LinkProgramARB);
1843    SET_UseProgramObjectARB(exec, _mesa_UseProgramObjectARB);
1844    SET_ValidateProgramARB(exec, _mesa_ValidateProgramARB);
1845    SET_GetObjectParameterfvARB(exec, _mesa_GetObjectParameterfvARB);
1846    SET_GetObjectParameterivARB(exec, _mesa_GetObjectParameterivARB);
1847    SET_GetInfoLogARB(exec, _mesa_GetInfoLogARB);
1848    SET_GetAttachedObjectsARB(exec, _mesa_GetAttachedObjectsARB);
1849    SET_GetShaderSourceARB(exec, _mesa_GetShaderSourceARB);
1850
1851    /* OpenGL 2.0 */
1852    SET_AttachShader(exec, _mesa_AttachShader);
1853    SET_CreateProgram(exec, _mesa_CreateProgram);
1854    SET_CreateShader(exec, _mesa_CreateShader);
1855    SET_DeleteProgram(exec, _mesa_DeleteProgram);
1856    SET_DeleteShader(exec, _mesa_DeleteShader);
1857    SET_DetachShader(exec, _mesa_DetachShader);
1858    SET_GetAttachedShaders(exec, _mesa_GetAttachedShaders);
1859    SET_GetProgramiv(exec, _mesa_GetProgramiv);
1860    SET_GetProgramInfoLog(exec, _mesa_GetProgramInfoLog);
1861    SET_GetShaderiv(exec, _mesa_GetShaderiv);
1862    SET_GetShaderInfoLog(exec, _mesa_GetShaderInfoLog);
1863    SET_IsProgram(exec, _mesa_IsProgram);
1864    SET_IsShader(exec, _mesa_IsShader);
1865
1866 #if FEATURE_ARB_vertex_shader
1867    SET_BindAttribLocationARB(exec, _mesa_BindAttribLocationARB);
1868    SET_GetActiveAttribARB(exec, _mesa_GetActiveAttribARB);
1869    SET_GetAttribLocationARB(exec, _mesa_GetAttribLocationARB);
1870 #endif
1871
1872 #if FEATURE_ARB_geometry_shader4
1873    SET_ProgramParameteriARB(exec, _mesa_ProgramParameteriARB);
1874 #endif
1875
1876    SET_UseShaderProgramEXT(exec, _mesa_UseShaderProgramEXT);
1877    SET_ActiveProgramEXT(exec, _mesa_ActiveProgramEXT);
1878    SET_CreateShaderProgramEXT(exec, _mesa_CreateShaderProgramEXT);
1879
1880    /* GL_EXT_gpu_shader4 / GL 3.0 */
1881    SET_BindFragDataLocationEXT(exec, _mesa_BindFragDataLocation);
1882    SET_GetFragDataLocationEXT(exec, _mesa_GetFragDataLocation);
1883
1884 #endif /* FEATURE_GL */
1885 }
1886