src/mesa/main/shaderapi.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2004-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2009-2010  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file shaderapi.c
  27  * \author Brian Paul
  28  *
  29  * Implementation of GLSL-related API functions.
  30  * The glUniform* functions are in uniforms.c
  31  *
  32  *
  33  * XXX things to do:
  34  * 1. Check that the right error code is generated for all _mesa_error() calls.
  35  * 2. Insert FLUSH_VERTICES calls in various places
  36  */
  37
  38
  39 #include "main/glheader.h"
  40 #include "main/context.h"
  41 #include "main/dispatch.h"
  42 #include "main/enums.h"
  43 #include "main/hash.h"
  44 #include "main/mfeatures.h"
  45 #include "main/mtypes.h"
  46 #include "main/shaderapi.h"
  47 #include "main/shaderobj.h"
  48 #include "main/uniforms.h"
  49 #include "program/program.h"
  50 #include "program/prog_parameter.h"
  51 #include "ralloc.h"
  52 #include <stdbool.h>
  53 #include "../glsl/glsl_parser_extras.h"
  54 #include "../glsl/ir_uniform.h"
  55
  56 /** Define this to enable shader substitution (see below) */
  57 #define SHADER_SUBST 0
  58
  59
  60 /**
  61  * Return mask of GLSL_x flags by examining the MESA_GLSL env var.
  62  */
  63 static GLbitfield
  64 get_shader_flags(void)
  65 {
  66    GLbitfield flags = 0x0;
  67    const char *env = _mesa_getenv("MESA_GLSL");
  68
  69    if (env) {
  70       if (strstr(env, "dump"))
  71          flags |= GLSL_DUMP;
  72       if (strstr(env, "log"))
  73          flags |= GLSL_LOG;
  74       if (strstr(env, "nopvert"))
  75          flags |= GLSL_NOP_VERT;
  76       if (strstr(env, "nopfrag"))
  77          flags |= GLSL_NOP_FRAG;
  78       if (strstr(env, "nopt"))
  79          flags |= GLSL_NO_OPT;
  80       else if (strstr(env, "opt"))
  81          flags |= GLSL_OPT;
  82       if (strstr(env, "uniform"))
  83          flags |= GLSL_UNIFORMS;
  84       if (strstr(env, "useprog"))
  85          flags |= GLSL_USE_PROG;
  86       if (strstr(env, "errors"))
  87          flags |= GLSL_REPORT_ERRORS;
  88    }
  89
  90    return flags;
  91 }
  92
  93
  94 /**
  95  * Initialize context's shader state.
  96  */
  97 void
  98 _mesa_init_shader_state(struct gl_context *ctx)
  99 {
 100    /* Device drivers may override these to control what kind of instructions
 101     * are generated by the GLSL compiler.
 102     */
 103    struct gl_shader_compiler_options options;
 104    gl_shader_type sh;
 105
 106    memset(&options, 0, sizeof(options));
 107    options.MaxUnrollIterations = 32;
 108    options.MaxIfDepth = UINT_MAX;
 109
 110    /* Default pragma settings */
 111    options.DefaultPragmas.Optimize = GL_TRUE;
 112
 113    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh)
 114       memcpy(&ctx->ShaderCompilerOptions[sh], &options, sizeof(options));
 115
 116    ctx->Shader.Flags = get_shader_flags();
 117 }
 118
 119
 120 /**
 121  * Free the per-context shader-related state.
 122  */
 123 void
 124 _mesa_free_shader_state(struct gl_context *ctx)
 125 {
 126    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentVertexProgram, NULL);
 127    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentGeometryProgram,
 128                                   NULL);
 129    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentFragmentProgram,
 130                                   NULL);
 131    _mesa_reference_shader_program(ctx, &ctx->Shader._CurrentFragmentProgram,
 132                                   NULL);
 133    _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, NULL);
 134 }
 135
 136
 137 /**
 138  * Copy string from <src> to <dst>, up to maxLength characters, returning
 139  * length of <dst> in <length>.
 140  * \param src  the strings source
 141  * \param maxLength  max chars to copy
 142  * \param length  returns number of chars copied
 143  * \param dst  the string destination
 144  */
 145 void
 146 _mesa_copy_string(GLchar *dst, GLsizei maxLength,
 147                   GLsizei *length, const GLchar *src)
 148 {
 149    GLsizei len;
 150    for (len = 0; len < maxLength - 1 && src && src[len]; len++)
 151       dst[len] = src[len];
 152    if (maxLength > 0)
 153       dst[len] = 0;
 154    if (length)
 155       *length = len;
 156 }
 157
 158
 159
 160 /**
 161  * Confirm that the a shader type is valid and supported by the implementation
 162  *
 163  * \param ctx   Current GL context
 164  * \param type  Shader target
 165  *
 166  */
 167 static bool
 168 validate_shader_target(const struct gl_context *ctx, GLenum type)
 169 {
 170    switch (type) {
 171    case GL_FRAGMENT_SHADER:
 172       return ctx->Extensions.ARB_fragment_shader;
 173    case GL_VERTEX_SHADER:
 174       return ctx->Extensions.ARB_vertex_shader;
 175    case GL_GEOMETRY_SHADER_ARB:
 176       return _mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_geometry_shader4;
 177    default:
 178       return false;
 179    }
 180 }
 181
 182
 183 /**
 184  * Find the length of the longest transform feedback varying name
 185  * which was specified with glTransformFeedbackVaryings().
 186  */
 187 static GLint
 188 longest_feedback_varying_name(const struct gl_shader_program *shProg)
 189 {
 190    GLuint i;
 191    GLint max = 0;
 192    for (i = 0; i < shProg->TransformFeedback.NumVarying; i++) {
 193       GLint len = strlen(shProg->TransformFeedback.VaryingNames[i]);
 194       if (len > max)
 195          max = len;
 196    }
 197    return max;
 198 }
 199
 200
 201
 202 static GLboolean
 203 is_program(struct gl_context *ctx, GLuint name)
 204 {
 205    struct gl_shader_program *shProg = _mesa_lookup_shader_program(ctx, name);
 206    return shProg ? GL_TRUE : GL_FALSE;
 207 }
 208
 209
 210 static GLboolean
 211 is_shader(struct gl_context *ctx, GLuint name)
 212 {
 213    struct gl_shader *shader = _mesa_lookup_shader(ctx, name);
 214    return shader ? GL_TRUE : GL_FALSE;
 215 }
 216
 217
 218 /**
 219  * Attach shader to a shader program.
 220  */
 221 static void
 222 attach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
 223 {
 224    struct gl_shader_program *shProg;
 225    struct gl_shader *sh;
 226    GLuint i, n;
 227
 228    shProg = _mesa_lookup_shader_program_err(ctx, program, "glAttachShader");
 229    if (!shProg)
 230       return;
 231
 232    sh = _mesa_lookup_shader_err(ctx, shader, "glAttachShader");
 233    if (!sh) {
 234       return;
 235    }
 236
 237    n = shProg->NumShaders;
 238    for (i = 0; i < n; i++) {
 239       if (shProg->Shaders[i] == sh) {
 240          /* The shader is already attched to this program.  The
 241           * GL_ARB_shader_objects spec says:
 242           *
 243           *     "The error INVALID_OPERATION is generated by AttachObjectARB
 244           *     if <obj> is already attached to <containerObj>."
 245           */
 246          _mesa_error(ctx, GL_INVALID_OPERATION, "glAttachShader");
 247          return;
 248       }
 249    }
 250
 251    /* grow list */
 252    shProg->Shaders = (struct gl_shader **)
 253       _mesa_realloc(shProg->Shaders,
 254                     n * sizeof(struct gl_shader *),
 255                     (n + 1) * sizeof(struct gl_shader *));
 256    if (!shProg->Shaders) {
 257       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAttachShader");
 258       return;
 259    }
 260
 261    /* append */
 262    shProg->Shaders[n] = NULL; /* since realloc() didn't zero the new space */
 263    _mesa_reference_shader(ctx, &shProg->Shaders[n], sh);
 264    shProg->NumShaders++;
 265 }
 266
 267
 268 static GLuint
 269 create_shader(struct gl_context *ctx, GLenum type)
 270 {
 271    struct gl_shader *sh;
 272    GLuint name;
 273
 274    if (!validate_shader_target(ctx, type)) {
 275       _mesa_error(ctx, GL_INVALID_ENUM, "CreateShader(type)");
 276       return 0;
 277    }
 278
 279    name = _mesa_HashFindFreeKeyBlock(ctx->Shared->ShaderObjects, 1);
 280    sh = ctx->Driver.NewShader(ctx, name, type);
 281    _mesa_HashInsert(ctx->Shared->ShaderObjects, name, sh);
 282
 283    return name;
 284 }
 285
 286
 287 static GLuint
 288 create_shader_program(struct gl_context *ctx)
 289 {
 290    GLuint name;
 291    struct gl_shader_program *shProg;
 292
 293    name = _mesa_HashFindFreeKeyBlock(ctx->Shared->ShaderObjects, 1);
 294
 295    shProg = ctx->Driver.NewShaderProgram(ctx, name);
 296
 297    _mesa_HashInsert(ctx->Shared->ShaderObjects, name, shProg);
 298
 299    assert(shProg->RefCount == 1);
 300
 301    return name;
 302 }
 303
 304
 305 /**
 306  * Named w/ "2" to indicate OpenGL 2.x vs GL_ARB_fragment_programs's
 307  * DeleteProgramARB.
 308  */
 309 static void
 310 delete_shader_program(struct gl_context *ctx, GLuint name)
 311 {
 312    /*
 313     * NOTE: deleting shaders/programs works a bit differently than
 314     * texture objects (and buffer objects, etc).  Shader/program
 315     * handles/IDs exist in the hash table until the object is really
 316     * deleted (refcount==0).  With texture objects, the handle/ID is
 317     * removed from the hash table in glDeleteTextures() while the tex
 318     * object itself might linger until its refcount goes to zero.
 319     */
 320    struct gl_shader_program *shProg;
 321
 322    shProg = _mesa_lookup_shader_program_err(ctx, name, "glDeleteProgram");
 323    if (!shProg)
 324       return;
 325
 326    if (!shProg->DeletePending) {
 327       shProg->DeletePending = GL_TRUE;
 328
 329       /* effectively, decr shProg's refcount */
 330       _mesa_reference_shader_program(ctx, &shProg, NULL);
 331    }
 332 }
 333
 334
 335 static void
 336 delete_shader(struct gl_context *ctx, GLuint shader)
 337 {
 338    struct gl_shader *sh;
 339
 340    sh = _mesa_lookup_shader_err(ctx, shader, "glDeleteShader");
 341    if (!sh)
 342       return;
 343
 344    if (!sh->DeletePending) {
 345       sh->DeletePending = GL_TRUE;
 346
 347       /* effectively, decr sh's refcount */
 348       _mesa_reference_shader(ctx, &sh, NULL);
 349    }
 350 }
 351
 352
 353 static void
 354 detach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
 355 {
 356    struct gl_shader_program *shProg;
 357    GLuint n;
 358    GLuint i, j;
 359
 360    shProg = _mesa_lookup_shader_program_err(ctx, program, "glDetachShader");
 361    if (!shProg)
 362       return;
 363
 364    n = shProg->NumShaders;
 365
 366    for (i = 0; i < n; i++) {
 367       if (shProg->Shaders[i]->Name == shader) {
 368          /* found it */
 369          struct gl_shader **newList;
 370
 371          /* release */
 372          _mesa_reference_shader(ctx, &shProg->Shaders[i], NULL);
 373
 374          /* alloc new, smaller array */
 375          newList =
 376             malloc((n - 1) * sizeof(struct gl_shader *));
 377          if (!newList) {
 378             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDetachShader");
 379             return;
 380          }
 381          for (j = 0; j < i; j++) {
 382             newList[j] = shProg->Shaders[j];
 383          }
 384          while (++i < n)
 385             newList[j++] = shProg->Shaders[i];
 386          free(shProg->Shaders);
 387
 388          shProg->Shaders = newList;
 389          shProg->NumShaders = n - 1;
 390
 391 #ifdef DEBUG
 392          /* sanity check */
 393          {
 394             for (j = 0; j < shProg->NumShaders; j++) {
 395                assert(shProg->Shaders[j]->Type == GL_VERTEX_SHADER ||
 396                       shProg->Shaders[j]->Type == GL_FRAGMENT_SHADER);
 397                assert(shProg->Shaders[j]->RefCount > 0);
 398             }
 399          }
 400 #endif
 401
 402          return;
 403       }
 404    }
 405
 406    /* not found */
 407    {
 408       GLenum err;
 409       if (is_shader(ctx, shader))
 410          err = GL_INVALID_OPERATION;
 411       else if (is_program(ctx, shader))
 412          err = GL_INVALID_OPERATION;
 413       else
 414          err = GL_INVALID_VALUE;
 415       _mesa_error(ctx, err, "glDetachProgram(shader)");
 416       return;
 417    }
 418 }
 419
 420
 421 /**
 422  * Return list of shaders attached to shader program.
 423  */
 424 static void
 425 get_attached_shaders(struct gl_context *ctx, GLuint program, GLsizei maxCount,
 426                      GLsizei *count, GLuint *obj)
 427 {
 428    struct gl_shader_program *shProg =
 429       _mesa_lookup_shader_program_err(ctx, program, "glGetAttachedShaders");
 430    if (shProg) {
 431       GLuint i;
 432       for (i = 0; i < (GLuint) maxCount && i < shProg->NumShaders; i++) {
 433          obj[i] = shProg->Shaders[i]->Name;
 434       }
 435       if (count)
 436          *count = i;
 437    }
 438 }
 439
 440
 441 /**
 442  * glGetHandleARB() - return ID/name of currently bound shader program.
 443  */
 444 static GLuint
 445 get_handle(struct gl_context *ctx, GLenum pname)
 446 {
 447    if (pname == GL_PROGRAM_OBJECT_ARB) {
 448       if (ctx->Shader.ActiveProgram)
 449          return ctx->Shader.ActiveProgram->Name;
 450       else
 451          return 0;
 452    }
 453    else {
 454       _mesa_error(ctx, GL_INVALID_ENUM, "glGetHandleARB");
 455       return 0;
 456    }
 457 }
 458
 459
 460 /**
 461  * glGetProgramiv() - get shader program state.
 462  * Note that this is for GLSL shader programs, not ARB vertex/fragment
 463  * programs (see glGetProgramivARB).
 464  */
 465 static void
 466 get_programiv(struct gl_context *ctx, GLuint program, GLenum pname, GLint *params)
 467 {
 468    struct gl_shader_program *shProg
 469       = _mesa_lookup_shader_program(ctx, program);
 470
 471    /* Is transform feedback available in this context?
 472     */
 473    const bool has_xfb =
 474       (ctx->API == API_OPENGL && ctx->Extensions.EXT_transform_feedback)
 475       || ctx->API == API_OPENGL_CORE
 476       || _mesa_is_gles3(ctx);
 477
 478    /* Are geometry shaders available in this context?
 479     */
 480    const bool has_gs =
 481       _mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_geometry_shader4;
 482
 483    /* Are uniform buffer objects available in this context?
 484     */
 485    const bool has_ubo =
 486       (ctx->API == API_OPENGL && ctx->Extensions.ARB_uniform_buffer_object)
 487       || ctx->API == API_OPENGL_CORE
 488       || _mesa_is_gles3(ctx);
 489
 490    if (!shProg) {
 491       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramiv(program)");
 492       return;
 493    }
 494
 495    switch (pname) {
 496    case GL_DELETE_STATUS:
 497       *params = shProg->DeletePending;
 498       return;
 499    case GL_LINK_STATUS:
 500       *params = shProg->LinkStatus;
 501       return;
 502    case GL_VALIDATE_STATUS:
 503       *params = shProg->Validated;
 504       return;
 505    case GL_INFO_LOG_LENGTH:
 506       *params = shProg->InfoLog ? strlen(shProg->InfoLog) + 1 : 0;
 507       return;
 508    case GL_ATTACHED_SHADERS:
 509       *params = shProg->NumShaders;
 510       return;
 511    case GL_ACTIVE_ATTRIBUTES:
 512       *params = _mesa_count_active_attribs(shProg);
 513       return;
 514    case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
 515       *params = _mesa_longest_attribute_name_length(shProg);
 516       return;
 517    case GL_ACTIVE_UNIFORMS:
 518       *params = shProg->NumUserUniformStorage;
 519       return;
 520    case GL_ACTIVE_UNIFORM_MAX_LENGTH: {
 521       unsigned i;
 522       GLint max_len = 0;
 523
 524       for (i = 0; i < shProg->NumUserUniformStorage; i++) {
 525          /* Add one for the terminating NUL character.
 526           */
 527          const GLint len = strlen(shProg->UniformStorage[i].name) + 1;
 528
 529          if (len > max_len)
 530             max_len = len;
 531       }
 532
 533       *params = max_len;
 534       return;
 535    }
 536    case GL_TRANSFORM_FEEDBACK_VARYINGS:
 537       if (!has_xfb)
 538          break;
 539       *params = shProg->TransformFeedback.NumVarying;
 540       return;
 541    case GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH:
 542       if (!has_xfb)
 543          break;
 544       *params = longest_feedback_varying_name(shProg) + 1;
 545       return;
 546    case GL_TRANSFORM_FEEDBACK_BUFFER_MODE:
 547       if (!has_xfb)
 548          break;
 549       *params = shProg->TransformFeedback.BufferMode;
 550       return;
 551    case GL_GEOMETRY_VERTICES_OUT_ARB:
 552       if (!has_gs)
 553          break;
 554       *params = shProg->Geom.VerticesOut;
 555       return;
 556    case GL_GEOMETRY_INPUT_TYPE_ARB:
 557       if (!has_gs)
 558          break;
 559       *params = shProg->Geom.InputType;
 560       return;
 561    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
 562       if (!has_gs)
 563          break;
 564       *params = shProg->Geom.OutputType;
 565       return;
 566    case GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH: {
 567       unsigned i;
 568       GLint max_len = 0;
 569
 570       if (!has_ubo)
 571          break;
 572
 573       for (i = 0; i < shProg->NumUniformBlocks; i++) {
 574          /* Add one for the terminating NUL character.
 575           */
 576          const GLint len = strlen(shProg->UniformBlocks[i].Name) + 1;
 577
 578          if (len > max_len)
 579             max_len = len;
 580       }
 581
 582       *params = max_len;
 583       return;
 584    }
 585    case GL_ACTIVE_UNIFORM_BLOCKS:
 586       if (!has_ubo)
 587          break;
 588
 589       *params = shProg->NumUniformBlocks;
 590       return;
 591    default:
 592       break;
 593    }
 594
 595    _mesa_error(ctx, GL_INVALID_ENUM, "glGetProgramiv(pname=%s)",
 596                _mesa_lookup_enum_by_nr(pname));
 597 }
 598
 599
 600 /**
 601  * glGetShaderiv() - get GLSL shader state
 602  */
 603 static void
 604 get_shaderiv(struct gl_context *ctx, GLuint name, GLenum pname, GLint *params)
 605 {
 606    struct gl_shader *shader =
 607       _mesa_lookup_shader_err(ctx, name, "glGetShaderiv");
 608
 609    if (!shader) {
 610       return;
 611    }
 612
 613    switch (pname) {
 614    case GL_SHADER_TYPE:
 615       *params = shader->Type;
 616       break;
 617    case GL_DELETE_STATUS:
 618       *params = shader->DeletePending;
 619       break;
 620    case GL_COMPILE_STATUS:
 621       *params = shader->CompileStatus;
 622       break;
 623    case GL_INFO_LOG_LENGTH:
 624       *params = shader->InfoLog ? strlen(shader->InfoLog) + 1 : 0;
 625       break;
 626    case GL_SHADER_SOURCE_LENGTH:
 627       *params = shader->Source ? strlen((char *) shader->Source) + 1 : 0;
 628       break;
 629    default:
 630       _mesa_error(ctx, GL_INVALID_ENUM, "glGetShaderiv(pname)");
 631       return;
 632    }
 633 }
 634
 635
 636 static void
 637 get_program_info_log(struct gl_context *ctx, GLuint program, GLsizei bufSize,
 638                      GLsizei *length, GLchar *infoLog)
 639 {
 640    struct gl_shader_program *shProg
 641       = _mesa_lookup_shader_program(ctx, program);
 642    if (!shProg) {
 643       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramInfoLog(program)");
 644       return;
 645    }
 646    _mesa_copy_string(infoLog, bufSize, length, shProg->InfoLog);
 647 }
 648
 649
 650 static void
 651 get_shader_info_log(struct gl_context *ctx, GLuint shader, GLsizei bufSize,
 652                     GLsizei *length, GLchar *infoLog)
 653 {
 654    struct gl_shader *sh = _mesa_lookup_shader(ctx, shader);
 655    if (!sh) {
 656       _mesa_error(ctx, GL_INVALID_VALUE, "glGetShaderInfoLog(shader)");
 657       return;
 658    }
 659    _mesa_copy_string(infoLog, bufSize, length, sh->InfoLog);
 660 }
 661
 662
 663 /**
 664  * Return shader source code.
 665  */
 666 static void
 667 get_shader_source(struct gl_context *ctx, GLuint shader, GLsizei maxLength,
 668                   GLsizei *length, GLchar *sourceOut)
 669 {
 670    struct gl_shader *sh;
 671    sh = _mesa_lookup_shader_err(ctx, shader, "glGetShaderSource");
 672    if (!sh) {
 673       return;
 674    }
 675    _mesa_copy_string(sourceOut, maxLength, length, sh->Source);
 676 }
 677
 678
 679 /**
 680  * Set/replace shader source code.  A helper function used by
 681  * glShaderSource[ARB] and glCreateShaderProgramEXT.
 682  */
 683 static void
 684 shader_source(struct gl_context *ctx, GLuint shader, const GLchar *source)
 685 {
 686    struct gl_shader *sh;
 687
 688    sh = _mesa_lookup_shader_err(ctx, shader, "glShaderSource");
 689    if (!sh)
 690       return;
 691
 692    /* free old shader source string and install new one */
 693    free((void *)sh->Source);
 694    sh->Source = source;
 695    sh->CompileStatus = GL_FALSE;
 696 #ifdef DEBUG
 697    sh->SourceChecksum = _mesa_str_checksum(sh->Source);
 698 #endif
 699 }
 700
 701
 702 /**
 703  * Compile a shader.
 704  */
 705 static void
 706 compile_shader(struct gl_context *ctx, GLuint shaderObj)
 707 {
 708    struct gl_shader *sh;
 709    struct gl_shader_compiler_options *options;
 710
 711    sh = _mesa_lookup_shader_err(ctx, shaderObj, "glCompileShader");
 712    if (!sh)
 713       return;
 714
 715    options = &ctx->ShaderCompilerOptions[_mesa_shader_type_to_index(sh->Type)];
 716
 717    /* set default pragma state for shader */
 718    sh->Pragmas = options->DefaultPragmas;
 719
 720    /* this call will set the sh->CompileStatus field to indicate if
 721     * compilation was successful.
 722     */
 723    _mesa_glsl_compile_shader(ctx, sh);
 724
 725    if (sh->CompileStatus == GL_FALSE &&
 726        (ctx->Shader.Flags & GLSL_REPORT_ERRORS)) {
 727       _mesa_debug(ctx, "Error compiling shader %u:\n%s\n",
 728                   sh->Name, sh->InfoLog);
 729    }
 730 }
 731
 732
 733 /**
 734  * Link a program's shaders.
 735  */
 736 static void
 737 link_program(struct gl_context *ctx, GLuint program)
 738 {
 739    struct gl_shader_program *shProg;
 740    struct gl_transform_feedback_object *obj =
 741       ctx->TransformFeedback.CurrentObject;
 742
 743    shProg = _mesa_lookup_shader_program_err(ctx, program, "glLinkProgram");
 744    if (!shProg)
 745       return;
 746
 747    if (obj->Active
 748        && (shProg == ctx->Shader.CurrentVertexProgram
 749            || shProg == ctx->Shader.CurrentGeometryProgram
 750            || shProg == ctx->Shader.CurrentFragmentProgram)) {
 751       _mesa_error(ctx, GL_INVALID_OPERATION,
 752                   "glLinkProgram(transform feedback active)");
 753       return;
 754    }
 755
 756    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 757
 758    _mesa_glsl_link_shader(ctx, shProg);
 759
 760    if (shProg->LinkStatus == GL_FALSE &&
 761        (ctx->Shader.Flags & GLSL_REPORT_ERRORS)) {
 762       _mesa_debug(ctx, "Error linking program %u:\n%s\n",
 763                   shProg->Name, shProg->InfoLog);
 764    }
 765
 766    /* debug code */
 767    if (0) {
 768       GLuint i;
 769
 770       printf("Link %u shaders in program %u: %s\n",
 771                    shProg->NumShaders, shProg->Name,
 772                    shProg->LinkStatus ? "Success" : "Failed");
 773
 774       for (i = 0; i < shProg->NumShaders; i++) {
 775          printf(" shader %u, type 0x%x\n",
 776                       shProg->Shaders[i]->Name,
 777                       shProg->Shaders[i]->Type);
 778       }
 779    }
 780 }
 781
 782
 783 /**
 784  * Print basic shader info (for debug).
 785  */
 786 static void
 787 print_shader_info(const struct gl_shader_program *shProg)
 788 {
 789    GLuint i;
 790
 791    printf("Mesa: glUseProgram(%u)\n", shProg->Name);
 792    for (i = 0; i < shProg->NumShaders; i++) {
 793       const char *s;
 794       switch (shProg->Shaders[i]->Type) {
 795       case GL_VERTEX_SHADER:
 796          s = "vertex";
 797          break;
 798       case GL_FRAGMENT_SHADER:
 799          s = "fragment";
 800          break;
 801       case GL_GEOMETRY_SHADER:
 802          s = "geometry";
 803          break;
 804       default:
 805          s = "";
 806       }
 807       printf("  %s shader %u, checksum %u\n", s,
 808              shProg->Shaders[i]->Name,
 809              shProg->Shaders[i]->SourceChecksum);
 810    }
 811    if (shProg->_LinkedShaders[MESA_SHADER_VERTEX])
 812       printf("  vert prog %u\n",
 813              shProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program->Id);
 814    if (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT])
 815       printf("  frag prog %u\n",
 816              shProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program->Id);
 817    if (shProg->_LinkedShaders[MESA_SHADER_GEOMETRY])
 818       printf("  geom prog %u\n",
 819              shProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program->Id);
 820 }
 821
 822
 823 /**
 824  * Use the named shader program for subsequent glUniform calls
 825  */
 826 void
 827 _mesa_active_program(struct gl_context *ctx, struct gl_shader_program *shProg,
 828                      const char *caller)
 829 {
 830    if ((shProg != NULL) && !shProg->LinkStatus) {
 831       _mesa_error(ctx, GL_INVALID_OPERATION,
 832                   "%s(program %u not linked)", caller, shProg->Name);
 833       return;
 834    }
 835
 836    if (ctx->Shader.ActiveProgram != shProg) {
 837       _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, shProg);
 838    }
 839 }
 840
 841 /**
 842  */
 843 static bool
 844 use_shader_program(struct gl_context *ctx, GLenum type,
 845                    struct gl_shader_program *shProg)
 846 {
 847    struct gl_shader_program **target;
 848
 849    switch (type) {
 850    case GL_VERTEX_SHADER:
 851       target = &ctx->Shader.CurrentVertexProgram;
 852       if ((shProg == NULL)
 853           || (shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL)) {
 854          shProg = NULL;
 855       }
 856       break;
 857    case GL_GEOMETRY_SHADER_ARB:
 858       target = &ctx->Shader.CurrentGeometryProgram;
 859       if ((shProg == NULL)
 860           || (shProg->_LinkedShaders[MESA_SHADER_GEOMETRY] == NULL)) {
 861          shProg = NULL;
 862       }
 863       break;
 864    case GL_FRAGMENT_SHADER:
 865       target = &ctx->Shader.CurrentFragmentProgram;
 866       if ((shProg == NULL)
 867           || (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL)) {
 868          shProg = NULL;
 869       }
 870       break;
 871    default:
 872       return false;
 873    }
 874
 875    if (*target != shProg) {
 876       FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
 877
 878       /* If the shader is also bound as the current rendering shader, unbind
 879        * it from that binding point as well.  This ensures that the correct
 880        * semantics of glDeleteProgram are maintained.
 881        */
 882       switch (type) {
 883       case GL_VERTEX_SHADER:
 884          /* Empty for now. */
 885          break;
 886       case GL_GEOMETRY_SHADER_ARB:
 887          /* Empty for now. */
 888          break;
 889       case GL_FRAGMENT_SHADER:
 890          if (*target == ctx->Shader._CurrentFragmentProgram) {
 891             _mesa_reference_shader_program(ctx,
 892                                            &ctx->Shader._CurrentFragmentProgram,
 893                                            NULL);
 894          }
 895          break;
 896       }
 897
 898       _mesa_reference_shader_program(ctx, target, shProg);
 899       return true;
 900    }
 901
 902    return false;
 903 }
 904
 905 /**
 906  * Use the named shader program for subsequent rendering.
 907  */
 908 void
 909 _mesa_use_program(struct gl_context *ctx, struct gl_shader_program *shProg)
 910 {
 911    use_shader_program(ctx, GL_VERTEX_SHADER, shProg);
 912    use_shader_program(ctx, GL_GEOMETRY_SHADER_ARB, shProg);
 913    use_shader_program(ctx, GL_FRAGMENT_SHADER, shProg);
 914    _mesa_active_program(ctx, shProg, "glUseProgram");
 915
 916    if (ctx->Driver.UseProgram)
 917       ctx->Driver.UseProgram(ctx, shProg);
 918 }
 919
 920
 921 /**
 922  * Do validation of the given shader program.
 923  * \param errMsg  returns error message if validation fails.
 924  * \return GL_TRUE if valid, GL_FALSE if invalid (and set errMsg)
 925  */
 926 static GLboolean
 927 validate_shader_program(const struct gl_shader_program *shProg,
 928                         char *errMsg)
 929 {
 930    if (!shProg->LinkStatus) {
 931       return GL_FALSE;
 932    }
 933
 934    /* From the GL spec, a program is invalid if any of these are true:
 935
 936      any two active samplers in the current program object are of
 937      different types, but refer to the same texture image unit,
 938
 939      any active sampler in the current program object refers to a texture
 940      image unit where fixed-function fragment processing accesses a
 941      texture target that does not match the sampler type, or
 942
 943      the sum of the number of active samplers in the program and the
 944      number of texture image units enabled for fixed-function fragment
 945      processing exceeds the combined limit on the total number of texture
 946      image units allowed.
 947    */
 948
 949
 950    /*
 951     * Check: any two active samplers in the current program object are of
 952     * different types, but refer to the same texture image unit,
 953     */
 954    if (!_mesa_sampler_uniforms_are_valid(shProg, errMsg, 100))
 955       return GL_FALSE;
 956
 957    return GL_TRUE;
 958 }
 959
 960
 961 /**
 962  * Called via glValidateProgram()
 963  */
 964 static void
 965 validate_program(struct gl_context *ctx, GLuint program)
 966 {
 967    struct gl_shader_program *shProg;
 968    char errMsg[100] = "";
 969
 970    shProg = _mesa_lookup_shader_program_err(ctx, program, "glValidateProgram");
 971    if (!shProg) {
 972       return;
 973    }
 974
 975    shProg->Validated = validate_shader_program(shProg, errMsg);
 976    if (!shProg->Validated) {
 977       /* update info log */
 978       if (shProg->InfoLog) {
 979          ralloc_free(shProg->InfoLog);
 980       }
 981       shProg->InfoLog = ralloc_strdup(shProg, errMsg);
 982    }
 983 }
 984
 985
 986
 987 void GLAPIENTRY
 988 _mesa_AttachObjectARB(GLhandleARB program, GLhandleARB shader)
 989 {
 990    GET_CURRENT_CONTEXT(ctx);
 991    attach_shader(ctx, program, shader);
 992 }
 993
 994
 995 void GLAPIENTRY
 996 _mesa_AttachShader(GLuint program, GLuint shader)
 997 {
 998    GET_CURRENT_CONTEXT(ctx);
 999    attach_shader(ctx, program, shader);
1000 }
1001
1002
1003 void GLAPIENTRY
1004 _mesa_CompileShaderARB(GLhandleARB shaderObj)
1005 {
1006    GET_CURRENT_CONTEXT(ctx);
1007    if (MESA_VERBOSE & VERBOSE_API)
1008       _mesa_debug(ctx, "glCompileShader %u\n", shaderObj);
1009    compile_shader(ctx, shaderObj);
1010 }
1011
1012
1013 GLuint GLAPIENTRY
1014 _mesa_CreateShader(GLenum type)
1015 {
1016    GET_CURRENT_CONTEXT(ctx);
1017    if (MESA_VERBOSE & VERBOSE_API)
1018       _mesa_debug(ctx, "glCreateShader %s\n", _mesa_lookup_enum_by_nr(type));
1019    return create_shader(ctx, type);
1020 }
1021
1022
1023 GLhandleARB GLAPIENTRY
1024 _mesa_CreateShaderObjectARB(GLenum type)
1025 {
1026    GET_CURRENT_CONTEXT(ctx);
1027    return create_shader(ctx, type);
1028 }
1029
1030
1031 GLuint GLAPIENTRY
1032 _mesa_CreateProgram(void)
1033 {
1034    GET_CURRENT_CONTEXT(ctx);
1035    if (MESA_VERBOSE & VERBOSE_API)
1036       _mesa_debug(ctx, "glCreateProgram\n");
1037    return create_shader_program(ctx);
1038 }
1039
1040
1041 GLhandleARB GLAPIENTRY
1042 _mesa_CreateProgramObjectARB(void)
1043 {
1044    GET_CURRENT_CONTEXT(ctx);
1045    return create_shader_program(ctx);
1046 }
1047
1048
1049 void GLAPIENTRY
1050 _mesa_DeleteObjectARB(GLhandleARB obj)
1051 {
1052    if (MESA_VERBOSE & VERBOSE_API) {
1053       GET_CURRENT_CONTEXT(ctx);
1054       _mesa_debug(ctx, "glDeleteObjectARB(%u)\n", obj);
1055    }
1056
1057    if (obj) {
1058       GET_CURRENT_CONTEXT(ctx);
1059       FLUSH_VERTICES(ctx, 0);
1060       if (is_program(ctx, obj)) {
1061          delete_shader_program(ctx, obj);
1062       }
1063       else if (is_shader(ctx, obj)) {
1064          delete_shader(ctx, obj);
1065       }
1066       else {
1067          /* error? */
1068       }
1069    }
1070 }
1071
1072
1073 void GLAPIENTRY
1074 _mesa_DeleteProgram(GLuint name)
1075 {
1076    if (name) {
1077       GET_CURRENT_CONTEXT(ctx);
1078       FLUSH_VERTICES(ctx, 0);
1079       delete_shader_program(ctx, name);
1080    }
1081 }
1082
1083
1084 void GLAPIENTRY
1085 _mesa_DeleteShader(GLuint name)
1086 {
1087    if (name) {
1088       GET_CURRENT_CONTEXT(ctx);
1089       FLUSH_VERTICES(ctx, 0);
1090       delete_shader(ctx, name);
1091    }
1092 }
1093
1094
1095 void GLAPIENTRY
1096 _mesa_DetachObjectARB(GLhandleARB program, GLhandleARB shader)
1097 {
1098    GET_CURRENT_CONTEXT(ctx);
1099    detach_shader(ctx, program, shader);
1100 }
1101
1102
1103 void GLAPIENTRY
1104 _mesa_DetachShader(GLuint program, GLuint shader)
1105 {
1106    GET_CURRENT_CONTEXT(ctx);
1107    detach_shader(ctx, program, shader);
1108 }
1109
1110
1111 void GLAPIENTRY
1112 _mesa_GetAttachedObjectsARB(GLhandleARB container, GLsizei maxCount,
1113                             GLsizei * count, GLhandleARB * obj)
1114 {
1115    GET_CURRENT_CONTEXT(ctx);
1116    get_attached_shaders(ctx, container, maxCount, count, obj);
1117 }
1118
1119
1120 void GLAPIENTRY
1121 _mesa_GetAttachedShaders(GLuint program, GLsizei maxCount,
1122                          GLsizei *count, GLuint *obj)
1123 {
1124    GET_CURRENT_CONTEXT(ctx);
1125    get_attached_shaders(ctx, program, maxCount, count, obj);
1126 }
1127
1128
1129 void GLAPIENTRY
1130 _mesa_GetInfoLogARB(GLhandleARB object, GLsizei maxLength, GLsizei * length,
1131                     GLcharARB * infoLog)
1132 {
1133    GET_CURRENT_CONTEXT(ctx);
1134    if (is_program(ctx, object)) {
1135       get_program_info_log(ctx, object, maxLength, length, infoLog);
1136    }
1137    else if (is_shader(ctx, object)) {
1138       get_shader_info_log(ctx, object, maxLength, length, infoLog);
1139    }
1140    else {
1141       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetInfoLogARB");
1142    }
1143 }
1144
1145
1146 void GLAPIENTRY
1147 _mesa_GetObjectParameterivARB(GLhandleARB object, GLenum pname, GLint *params)
1148 {
1149    GET_CURRENT_CONTEXT(ctx);
1150    /* Implement in terms of GetProgramiv, GetShaderiv */
1151    if (is_program(ctx, object)) {
1152       if (pname == GL_OBJECT_TYPE_ARB) {
1153          *params = GL_PROGRAM_OBJECT_ARB;
1154       }
1155       else {
1156          get_programiv(ctx, object, pname, params);
1157       }
1158    }
1159    else if (is_shader(ctx, object)) {
1160       if (pname == GL_OBJECT_TYPE_ARB) {
1161          *params = GL_SHADER_OBJECT_ARB;
1162       }
1163       else {
1164          get_shaderiv(ctx, object, pname, params);
1165       }
1166    }
1167    else {
1168       _mesa_error(ctx, GL_INVALID_VALUE, "glGetObjectParameterivARB");
1169    }
1170 }
1171
1172
1173 void GLAPIENTRY
1174 _mesa_GetObjectParameterfvARB(GLhandleARB object, GLenum pname,
1175                               GLfloat *params)
1176 {
1177    GLint iparams[1];  /* XXX is one element enough? */
1178    _mesa_GetObjectParameterivARB(object, pname, iparams);
1179    params[0] = (GLfloat) iparams[0];
1180 }
1181
1182
1183 void GLAPIENTRY
1184 _mesa_GetProgramiv(GLuint program, GLenum pname, GLint *params)
1185 {
1186    GET_CURRENT_CONTEXT(ctx);
1187    get_programiv(ctx, program, pname, params);
1188 }
1189
1190
1191 void GLAPIENTRY
1192 _mesa_GetShaderiv(GLuint shader, GLenum pname, GLint *params)
1193 {
1194    GET_CURRENT_CONTEXT(ctx);
1195    get_shaderiv(ctx, shader, pname, params);
1196 }
1197
1198
1199 void GLAPIENTRY
1200 _mesa_GetProgramInfoLog(GLuint program, GLsizei bufSize,
1201                         GLsizei *length, GLchar *infoLog)
1202 {
1203    GET_CURRENT_CONTEXT(ctx);
1204    get_program_info_log(ctx, program, bufSize, length, infoLog);
1205 }
1206
1207
1208 void GLAPIENTRY
1209 _mesa_GetShaderInfoLog(GLuint shader, GLsizei bufSize,
1210                        GLsizei *length, GLchar *infoLog)
1211 {
1212    GET_CURRENT_CONTEXT(ctx);
1213    get_shader_info_log(ctx, shader, bufSize, length, infoLog);
1214 }
1215
1216
1217 void GLAPIENTRY
1218 _mesa_GetShaderSourceARB(GLhandleARB shader, GLsizei maxLength,
1219                          GLsizei *length, GLcharARB *sourceOut)
1220 {
1221    GET_CURRENT_CONTEXT(ctx);
1222    get_shader_source(ctx, shader, maxLength, length, sourceOut);
1223 }
1224
1225
1226 GLhandleARB GLAPIENTRY
1227 _mesa_GetHandleARB(GLenum pname)
1228 {
1229    GET_CURRENT_CONTEXT(ctx);
1230    return get_handle(ctx, pname);
1231 }
1232
1233
1234 GLboolean GLAPIENTRY
1235 _mesa_IsProgram(GLuint name)
1236 {
1237    GET_CURRENT_CONTEXT(ctx);
1238    return is_program(ctx, name);
1239 }
1240
1241
1242 GLboolean GLAPIENTRY
1243 _mesa_IsShader(GLuint name)
1244 {
1245    GET_CURRENT_CONTEXT(ctx);
1246    return is_shader(ctx, name);
1247 }
1248
1249
1250 void GLAPIENTRY
1251 _mesa_LinkProgramARB(GLhandleARB programObj)
1252 {
1253    GET_CURRENT_CONTEXT(ctx);
1254    link_program(ctx, programObj);
1255 }
1256
1257
1258
1259 /**
1260  * Read shader source code from a file.
1261  * Useful for debugging to override an app's shader.
1262  */
1263 static GLcharARB *
1264 read_shader(const char *fname)
1265 {
1266    const int max = 50*1000;
1267    FILE *f = fopen(fname, "r");
1268    GLcharARB *buffer, *shader;
1269    int len;
1270
1271    if (!f) {
1272       return NULL;
1273    }
1274
1275    buffer = malloc(max);
1276    len = fread(buffer, 1, max, f);
1277    buffer[len] = 0;
1278
1279    fclose(f);
1280
1281    shader = _mesa_strdup(buffer);
1282    free(buffer);
1283
1284    return shader;
1285 }
1286
1287
1288 /**
1289  * Called via glShaderSource() and glShaderSourceARB() API functions.
1290  * Basically, concatenate the source code strings into one long string
1291  * and pass it to _mesa_shader_source().
1292  */
1293 void GLAPIENTRY
1294 _mesa_ShaderSourceARB(GLhandleARB shaderObj, GLsizei count,
1295                       const GLcharARB ** string, const GLint * length)
1296 {
1297    GET_CURRENT_CONTEXT(ctx);
1298    GLint *offsets;
1299    GLsizei i, totalLength;
1300    GLcharARB *source;
1301    GLuint checksum;
1302
1303    if (!shaderObj || string == NULL) {
1304       _mesa_error(ctx, GL_INVALID_VALUE, "glShaderSourceARB");
1305       return;
1306    }
1307
1308    /*
1309     * This array holds offsets of where the appropriate string ends, thus the
1310     * last element will be set to the total length of the source code.
1311     */
1312    offsets = malloc(count * sizeof(GLint));
1313    if (offsets == NULL) {
1314       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
1315       return;
1316    }
1317
1318    for (i = 0; i < count; i++) {
1319       if (string[i] == NULL) {
1320          free((GLvoid *) offsets);
1321          _mesa_error(ctx, GL_INVALID_OPERATION,
1322                      "glShaderSourceARB(null string)");
1323          return;
1324       }
1325       if (length == NULL || length[i] < 0)
1326          offsets[i] = strlen(string[i]);
1327       else
1328          offsets[i] = length[i];
1329       /* accumulate string lengths */
1330       if (i > 0)
1331          offsets[i] += offsets[i - 1];
1332    }
1333
1334    /* Total length of source string is sum off all strings plus two.
1335     * One extra byte for terminating zero, another extra byte to silence
1336     * valgrind warnings in the parser/grammer code.
1337     */
1338    totalLength = offsets[count - 1] + 2;
1339    source = malloc(totalLength * sizeof(GLcharARB));
1340    if (source == NULL) {
1341       free((GLvoid *) offsets);
1342       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
1343       return;
1344    }
1345
1346    for (i = 0; i < count; i++) {
1347       GLint start = (i > 0) ? offsets[i - 1] : 0;
1348       memcpy(source + start, string[i],
1349              (offsets[i] - start) * sizeof(GLcharARB));
1350    }
1351    source[totalLength - 1] = '\0';
1352    source[totalLength - 2] = '\0';
1353
1354    if (SHADER_SUBST) {
1355       /* Compute the shader's source code checksum then try to open a file
1356        * named newshader_<CHECKSUM>.  If it exists, use it in place of the
1357        * original shader source code.  For debugging.
1358        */
1359       char filename[100];
1360       GLcharARB *newSource;
1361
1362       checksum = _mesa_str_checksum(source);
1363
1364       _mesa_snprintf(filename, sizeof(filename), "newshader_%d", checksum);
1365
1366       newSource = read_shader(filename);
1367       if (newSource) {
1368          fprintf(stderr, "Mesa: Replacing shader %u chksum=%d with %s\n",
1369                        shaderObj, checksum, filename);
1370          free(source);
1371          source = newSource;
1372       }
1373    }
1374
1375    shader_source(ctx, shaderObj, source);
1376
1377    if (SHADER_SUBST) {
1378       struct gl_shader *sh = _mesa_lookup_shader(ctx, shaderObj);
1379       if (sh)
1380          sh->SourceChecksum = checksum; /* save original checksum */
1381    }
1382
1383    free(offsets);
1384 }
1385
1386
1387 void GLAPIENTRY
1388 _mesa_UseProgramObjectARB(GLhandleARB program)
1389 {
1390    GET_CURRENT_CONTEXT(ctx);
1391    struct gl_shader_program *shProg;
1392    struct gl_transform_feedback_object *obj =
1393       ctx->TransformFeedback.CurrentObject;
1394
1395    ASSERT_OUTSIDE_BEGIN_END(ctx);
1396
1397    if (obj->Active && !obj->Paused) {
1398       _mesa_error(ctx, GL_INVALID_OPERATION,
1399                   "glUseProgram(transform feedback active)");
1400       return;
1401    }
1402
1403    if (program) {
1404       shProg = _mesa_lookup_shader_program_err(ctx, program, "glUseProgram");
1405       if (!shProg) {
1406          return;
1407       }
1408       if (!shProg->LinkStatus) {
1409          _mesa_error(ctx, GL_INVALID_OPERATION,
1410                      "glUseProgram(program %u not linked)", program);
1411          return;
1412       }
1413
1414       /* debug code */
1415       if (ctx->Shader.Flags & GLSL_USE_PROG) {
1416          print_shader_info(shProg);
1417       }
1418    }
1419    else {
1420       shProg = NULL;
1421    }
1422
1423    _mesa_use_program(ctx, shProg);
1424 }
1425
1426
1427 void GLAPIENTRY
1428 _mesa_ValidateProgramARB(GLhandleARB program)
1429 {
1430    GET_CURRENT_CONTEXT(ctx);
1431    validate_program(ctx, program);
1432 }
1433
1434 #ifdef FEATURE_ES2
1435
1436 void GLAPIENTRY
1437 _mesa_GetShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype,
1438                                GLint* range, GLint* precision)
1439 {
1440    const struct gl_program_constants *limits;
1441    const struct gl_precision *p;
1442    GET_CURRENT_CONTEXT(ctx);
1443
1444    switch (shadertype) {
1445    case GL_VERTEX_SHADER:
1446       limits = &ctx->Const.VertexProgram;
1447       break;
1448    case GL_FRAGMENT_SHADER:
1449       limits = &ctx->Const.FragmentProgram;
1450       break;
1451    default:
1452       _mesa_error(ctx, GL_INVALID_ENUM,
1453                   "glGetShaderPrecisionFormat(shadertype)");
1454       return;
1455    }
1456
1457    switch (precisiontype) {
1458    case GL_LOW_FLOAT:
1459       p = &limits->LowFloat;
1460       break;
1461    case GL_MEDIUM_FLOAT:
1462       p = &limits->MediumFloat;
1463       break;
1464    case GL_HIGH_FLOAT:
1465       p = &limits->HighFloat;
1466       break;
1467    case GL_LOW_INT:
1468       p = &limits->LowInt;
1469       break;
1470    case GL_MEDIUM_INT:
1471       p = &limits->MediumInt;
1472       break;
1473    case GL_HIGH_INT:
1474       p = &limits->HighInt;
1475       break;
1476    default:
1477       _mesa_error(ctx, GL_INVALID_ENUM,
1478                   "glGetShaderPrecisionFormat(precisiontype)");
1479       return;
1480    }
1481
1482    range[0] = p->RangeMin;
1483    range[1] = p->RangeMax;
1484    precision[0] = p->Precision;
1485 }
1486
1487
1488 void GLAPIENTRY
1489 _mesa_ReleaseShaderCompiler(void)
1490 {
1491    _mesa_destroy_shader_compiler_caches();
1492 }
1493
1494
1495 void GLAPIENTRY
1496 _mesa_ShaderBinary(GLint n, const GLuint* shaders, GLenum binaryformat,
1497                    const void* binary, GLint length)
1498 {
1499    GET_CURRENT_CONTEXT(ctx);
1500    (void) n;
1501    (void) shaders;
1502    (void) binaryformat;
1503    (void) binary;
1504    (void) length;
1505    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
1506 }
1507
1508 #endif /* FEATURE_ES2 */
1509
1510
1511 void GLAPIENTRY
1512 _mesa_ProgramParameteriARB(GLuint program, GLenum pname, GLint value)
1513 {
1514    struct gl_shader_program *shProg;
1515    GET_CURRENT_CONTEXT(ctx);
1516
1517    ASSERT_OUTSIDE_BEGIN_END(ctx);
1518
1519    shProg = _mesa_lookup_shader_program_err(ctx, program,
1520                                             "glProgramParameteri");
1521    if (!shProg)
1522       return;
1523
1524    switch (pname) {
1525    case GL_GEOMETRY_VERTICES_OUT_ARB:
1526       if (value < 1 ||
1527           (unsigned) value > ctx->Const.MaxGeometryOutputVertices) {
1528          _mesa_error(ctx, GL_INVALID_VALUE,
1529                      "glProgramParameteri(GL_GEOMETRY_VERTICES_OUT_ARB=%d",
1530                      value);
1531          return;
1532       }
1533       shProg->Geom.VerticesOut = value;
1534       break;
1535    case GL_GEOMETRY_INPUT_TYPE_ARB:
1536       switch (value) {
1537       case GL_POINTS:
1538       case GL_LINES:
1539       case GL_LINES_ADJACENCY_ARB:
1540       case GL_TRIANGLES:
1541       case GL_TRIANGLES_ADJACENCY_ARB:
1542          shProg->Geom.InputType = value;
1543          break;
1544       default:
1545          _mesa_error(ctx, GL_INVALID_VALUE,
1546                      "glProgramParameteri(geometry input type = %s",
1547                      _mesa_lookup_enum_by_nr(value));
1548          return;
1549       }
1550       break;
1551    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
1552       switch (value) {
1553       case GL_POINTS:
1554       case GL_LINE_STRIP:
1555       case GL_TRIANGLE_STRIP:
1556          shProg->Geom.OutputType = value;
1557          break;
1558       default:
1559          _mesa_error(ctx, GL_INVALID_VALUE,
1560                      "glProgramParameteri(geometry output type = %s",
1561                      _mesa_lookup_enum_by_nr(value));
1562          return;
1563       }
1564       break;
1565    default:
1566       _mesa_error(ctx, GL_INVALID_ENUM, "glProgramParameteriARB(pname=%s)",
1567                   _mesa_lookup_enum_by_nr(pname));
1568       break;
1569    }
1570 }
1571
1572 void
1573 _mesa_use_shader_program(struct gl_context *ctx, GLenum type,
1574                          struct gl_shader_program *shProg)
1575 {
1576    use_shader_program(ctx, type, shProg);
1577
1578    if (ctx->Driver.UseProgram)
1579       ctx->Driver.UseProgram(ctx, shProg);
1580 }
1581
1582
1583 /**
1584  * For GL_EXT_separate_shader_objects
1585  */
1586 void GLAPIENTRY
1587 _mesa_UseShaderProgramEXT(GLenum type, GLuint program)
1588 {
1589    GET_CURRENT_CONTEXT(ctx);
1590    struct gl_shader_program *shProg = NULL;
1591
1592    ASSERT_OUTSIDE_BEGIN_END(ctx);
1593
1594    if (!validate_shader_target(ctx, type)) {
1595       _mesa_error(ctx, GL_INVALID_ENUM, "glUseShaderProgramEXT(type)");
1596       return;
1597    }
1598
1599    if (ctx->TransformFeedback.CurrentObject->Active &&
1600        !ctx->TransformFeedback.CurrentObject->Paused) {
1601       _mesa_error(ctx, GL_INVALID_OPERATION,
1602                   "glUseShaderProgramEXT(transform feedback is active)");
1603       return;
1604    }
1605
1606    if (program) {
1607       shProg = _mesa_lookup_shader_program_err(ctx, program,
1608                                                "glUseShaderProgramEXT");
1609       if (shProg == NULL)
1610          return;
1611
1612       if (!shProg->LinkStatus) {
1613          _mesa_error(ctx, GL_INVALID_OPERATION,
1614                      "glUseShaderProgramEXT(program not linked)");
1615          return;
1616       }
1617    }
1618
1619    _mesa_use_shader_program(ctx, type, shProg);
1620 }
1621
1622
1623 /**
1624  * For GL_EXT_separate_shader_objects
1625  */
1626 void GLAPIENTRY
1627 _mesa_ActiveProgramEXT(GLuint program)
1628 {
1629    GET_CURRENT_CONTEXT(ctx);
1630    struct gl_shader_program *shProg = (program != 0)
1631       ? _mesa_lookup_shader_program_err(ctx, program, "glActiveProgramEXT")
1632       : NULL;
1633
1634    _mesa_active_program(ctx, shProg, "glActiveProgramEXT");
1635    return;
1636 }
1637
1638
1639 /**
1640  * For GL_EXT_separate_shader_objects
1641  */
1642 GLuint GLAPIENTRY
1643 _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string)
1644 {
1645    GET_CURRENT_CONTEXT(ctx);
1646    const GLuint shader = create_shader(ctx, type);
1647    GLuint program = 0;
1648
1649    if (shader) {
1650       shader_source(ctx, shader, _mesa_strdup(string));
1651       compile_shader(ctx, shader);
1652
1653       program = create_shader_program(ctx);
1654       if (program) {
1655          struct gl_shader_program *shProg;
1656          struct gl_shader *sh;
1657          GLint compiled = GL_FALSE;
1658
1659          shProg = _mesa_lookup_shader_program(ctx, program);
1660          sh = _mesa_lookup_shader(ctx, shader);
1661
1662          get_shaderiv(ctx, shader, GL_COMPILE_STATUS, &compiled);
1663          if (compiled) {
1664             attach_shader(ctx, program, shader);
1665             link_program(ctx, program);
1666             detach_shader(ctx, program, shader);
1667
1668 #if 0
1669             /* Possibly... */
1670             if (active-user-defined-varyings-in-linked-program) {
1671                append-error-to-info-log;
1672                shProg->LinkStatus = GL_FALSE;
1673             }
1674 #endif
1675          }
1676
1677          ralloc_strcat(&shProg->InfoLog, sh->InfoLog);
1678       }
1679
1680       delete_shader(ctx, shader);
1681    }
1682
1683    return program;
1684 }
1685
1686 /**
1687  * Plug in shader-related functions into API dispatch table.
1688  */
1689 void
1690 _mesa_init_shader_dispatch(const struct gl_context *ctx,
1691                            struct _glapi_table *exec)
1692 {
1693 #if FEATURE_GL
1694    /* GL_ARB_vertex/fragment_shader */
1695    if (_mesa_is_desktop_gl(ctx)) {
1696       SET_DeleteObjectARB(exec, _mesa_DeleteObjectARB);
1697       SET_GetHandleARB(exec, _mesa_GetHandleARB);
1698       SET_DetachObjectARB(exec, _mesa_DetachObjectARB);
1699       SET_CreateShaderObjectARB(exec, _mesa_CreateShaderObjectARB);
1700       SET_CreateProgramObjectARB(exec, _mesa_CreateProgramObjectARB);
1701       SET_AttachObjectARB(exec, _mesa_AttachObjectARB);
1702       SET_GetObjectParameterfvARB(exec, _mesa_GetObjectParameterfvARB);
1703       SET_GetObjectParameterivARB(exec, _mesa_GetObjectParameterivARB);
1704       SET_GetInfoLogARB(exec, _mesa_GetInfoLogARB);
1705       SET_GetAttachedObjectsARB(exec, _mesa_GetAttachedObjectsARB);
1706    }
1707
1708    if (ctx->API != API_OPENGLES) {
1709       SET_ShaderSourceARB(exec, _mesa_ShaderSourceARB);
1710       SET_CompileShaderARB(exec, _mesa_CompileShaderARB);
1711       SET_LinkProgramARB(exec, _mesa_LinkProgramARB);
1712       SET_UseProgramObjectARB(exec, _mesa_UseProgramObjectARB);
1713       SET_ValidateProgramARB(exec, _mesa_ValidateProgramARB);
1714       SET_GetShaderSourceARB(exec, _mesa_GetShaderSourceARB);
1715
1716       /* OpenGL 2.0 */
1717       SET_AttachShader(exec, _mesa_AttachShader);
1718       SET_CreateProgram(exec, _mesa_CreateProgram);
1719       SET_CreateShader(exec, _mesa_CreateShader);
1720       SET_DeleteProgram(exec, _mesa_DeleteProgram);
1721       SET_DeleteShader(exec, _mesa_DeleteShader);
1722       SET_DetachShader(exec, _mesa_DetachShader);
1723       SET_GetAttachedShaders(exec, _mesa_GetAttachedShaders);
1724       SET_GetProgramiv(exec, _mesa_GetProgramiv);
1725       SET_GetProgramInfoLog(exec, _mesa_GetProgramInfoLog);
1726       SET_GetShaderiv(exec, _mesa_GetShaderiv);
1727       SET_GetShaderInfoLog(exec, _mesa_GetShaderInfoLog);
1728       SET_IsProgram(exec, _mesa_IsProgram);
1729       SET_IsShader(exec, _mesa_IsShader);
1730
1731       /* GL_ARB_vertex_shader */
1732       SET_BindAttribLocationARB(exec, _mesa_BindAttribLocationARB);
1733       SET_GetActiveAttribARB(exec, _mesa_GetActiveAttribARB);
1734       SET_GetAttribLocationARB(exec, _mesa_GetAttribLocationARB);
1735    }
1736
1737    if (_mesa_is_desktop_gl(ctx)) {
1738       SET_ProgramParameteri(exec, _mesa_ProgramParameteriARB);
1739    }
1740
1741    if (ctx->API == API_OPENGL) {
1742       SET_UseShaderProgramEXT(exec, _mesa_UseShaderProgramEXT);
1743       SET_ActiveProgramEXT(exec, _mesa_ActiveProgramEXT);
1744       SET_CreateShaderProgramEXT(exec, _mesa_CreateShaderProgramEXT);
1745    }
1746
1747    /* GL_EXT_gpu_shader4 / GL 3.0 */
1748    if (_mesa_is_desktop_gl(ctx)) {
1749       SET_BindFragDataLocationEXT(exec, _mesa_BindFragDataLocation);
1750    }
1751    if (_mesa_is_desktop_gl(ctx) || _mesa_is_gles3(ctx)) {
1752       SET_GetFragDataLocationEXT(exec, _mesa_GetFragDataLocation);
1753    }
1754
1755    /* GL_ARB_ES2_compatibility */
1756    if (ctx->API != API_OPENGLES) {
1757       SET_ReleaseShaderCompiler(exec, _mesa_ReleaseShaderCompiler);
1758       SET_GetShaderPrecisionFormat(exec, _mesa_GetShaderPrecisionFormat);
1759       SET_ShaderBinary(exec, _mesa_ShaderBinary);
1760    }
1761
1762    /* GL_ARB_blend_func_extended */
1763    if (_mesa_is_desktop_gl(ctx)) {
1764       SET_BindFragDataLocationIndexed(exec, _mesa_BindFragDataLocationIndexed);
1765       SET_GetFragDataIndex(exec, _mesa_GetFragDataIndex);
1766    }
1767 #endif /* FEATURE_GL */
1768 }
1769