src/mesa/main/shader_query.cpp

   1 /*
   2  * Copyright © 2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file shader_query.cpp
  26  * C-to-C++ bridge functions to query GLSL shader data
  27  *
  28  * \author Ian Romanick <ian.d.romanick@intel.com>
  29  */
  30
  31 #include "main/context.h"
  32 #include "main/core.h"
  33 #include "main/enums.h"
  34 #include "main/shaderapi.h"
  35 #include "main/shaderobj.h"
  36 #include "main/uniforms.h"
  37 #include "compiler/glsl/glsl_symbol_table.h"
  38 #include "compiler/glsl/ir.h"
  39 #include "compiler/glsl/program.h"
  40 #include "compiler/glsl/string_to_uint_map.h"
  41
  42
  43 static GLint
  44 program_resource_location(struct gl_program_resource *res,
  45                           unsigned array_index);
  46
  47 /**
  48  * Declare convenience functions to return resource data in a given type.
  49  * Warning! this is not type safe so be *very* careful when using these.
  50  */
  51 #define DECL_RESOURCE_FUNC(name, type) \
  52 const type * RESOURCE_ ## name (gl_program_resource *res) { \
  53    assert(res->Data); \
  54    return (type *) res->Data; \
  55 }
  56
  57 DECL_RESOURCE_FUNC(VAR, gl_shader_variable);
  58 DECL_RESOURCE_FUNC(UBO, gl_uniform_block);
  59 DECL_RESOURCE_FUNC(UNI, gl_uniform_storage);
  60 DECL_RESOURCE_FUNC(ATC, gl_active_atomic_buffer);
  61 DECL_RESOURCE_FUNC(XFV, gl_transform_feedback_varying_info);
  62 DECL_RESOURCE_FUNC(XFB, gl_transform_feedback_buffer);
  63 DECL_RESOURCE_FUNC(SUB, gl_subroutine_function);
  64
  65 static void
  66 bind_attrib_location(struct gl_context *ctx,
  67                      struct gl_shader_program *const shProg, GLuint index,
  68                      const GLchar *name, bool no_error)
  69 {
  70    if (!name)
  71       return;
  72
  73    if (!no_error) {
  74       if (strncmp(name, "gl_", 3) == 0) {
  75          _mesa_error(ctx, GL_INVALID_OPERATION,
  76                      "glBindAttribLocation(illegal name)");
  77          return;
  78       }
  79
  80       if (index >= ctx->Const.Program[MESA_SHADER_VERTEX].MaxAttribs) {
  81          _mesa_error(ctx, GL_INVALID_VALUE, "glBindAttribLocation(%u >= %u)",
  82                      index, ctx->Const.Program[MESA_SHADER_VERTEX].MaxAttribs);
  83          return;
  84       }
  85    }
  86
  87    /* Replace the current value if it's already in the list.  Add
  88     * VERT_ATTRIB_GENERIC0 because that's how the linker differentiates
  89     * between built-in attributes and user-defined attributes.
  90     */
  91    shProg->AttributeBindings->put(index + VERT_ATTRIB_GENERIC0, name);
  92
  93    /*
  94     * Note that this attribute binding won't go into effect until
  95     * glLinkProgram is called again.
  96     */
  97 }
  98
  99 void GLAPIENTRY
 100 _mesa_BindAttribLocation_no_error(GLuint program, GLuint index,
 101                                   const GLchar *name)
 102 {
 103    GET_CURRENT_CONTEXT(ctx);
 104
 105    struct gl_shader_program *const shProg =
 106       _mesa_lookup_shader_program(ctx, program);
 107    bind_attrib_location(ctx, shProg, index, name, true);
 108 }
 109
 110 void GLAPIENTRY
 111 _mesa_BindAttribLocation(GLuint program, GLuint index,
 112                          const GLchar *name)
 113 {
 114    GET_CURRENT_CONTEXT(ctx);
 115
 116    struct gl_shader_program *const shProg =
 117       _mesa_lookup_shader_program_err(ctx, program, "glBindAttribLocation");
 118    if (!shProg)
 119       return;
 120
 121    bind_attrib_location(ctx, shProg, index, name, false);
 122 }
 123
 124 void GLAPIENTRY
 125 _mesa_GetActiveAttrib(GLuint program, GLuint desired_index,
 126                       GLsizei maxLength, GLsizei * length, GLint * size,
 127                       GLenum * type, GLchar * name)
 128 {
 129    GET_CURRENT_CONTEXT(ctx);
 130    struct gl_shader_program *shProg;
 131
 132    if (maxLength < 0) {
 133       _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveAttrib(maxLength < 0)");
 134       return;
 135    }
 136
 137    shProg = _mesa_lookup_shader_program_err(ctx, program, "glGetActiveAttrib");
 138    if (!shProg)
 139       return;
 140
 141    if (!shProg->data->LinkStatus) {
 142       _mesa_error(ctx, GL_INVALID_VALUE,
 143                   "glGetActiveAttrib(program not linked)");
 144       return;
 145    }
 146
 147    if (shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL) {
 148       _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveAttrib(no vertex shader)");
 149       return;
 150    }
 151
 152    struct gl_program_resource *res =
 153       _mesa_program_resource_find_index(shProg, GL_PROGRAM_INPUT,
 154                                         desired_index);
 155
 156    /* User asked for index that does not exist. */
 157    if (!res) {
 158       _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveAttrib(index)");
 159       return;
 160    }
 161
 162    const gl_shader_variable *const var = RESOURCE_VAR(res);
 163
 164    const char *var_name = var->name;
 165
 166    _mesa_copy_string(name, maxLength, length, var_name);
 167
 168    if (size)
 169       _mesa_program_resource_prop(shProg, res, desired_index, GL_ARRAY_SIZE,
 170                                   size, "glGetActiveAttrib");
 171
 172    if (type)
 173       _mesa_program_resource_prop(shProg, res, desired_index, GL_TYPE,
 174                                   (GLint *) type, "glGetActiveAttrib");
 175 }
 176
 177 GLint GLAPIENTRY
 178 _mesa_GetAttribLocation(GLuint program, const GLchar * name)
 179 {
 180    GET_CURRENT_CONTEXT(ctx);
 181    struct gl_shader_program *const shProg =
 182       _mesa_lookup_shader_program_err(ctx, program, "glGetAttribLocation");
 183
 184    if (!shProg) {
 185       return -1;
 186    }
 187
 188    if (!shProg->data->LinkStatus) {
 189       _mesa_error(ctx, GL_INVALID_OPERATION,
 190                   "glGetAttribLocation(program not linked)");
 191       return -1;
 192    }
 193
 194    if (!name)
 195       return -1;
 196
 197    /* Not having a vertex shader is not an error.
 198     */
 199    if (shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL)
 200       return -1;
 201
 202    unsigned array_index = 0;
 203    struct gl_program_resource *res =
 204       _mesa_program_resource_find_name(shProg, GL_PROGRAM_INPUT, name,
 205                                        &array_index);
 206
 207    if (!res)
 208       return -1;
 209
 210    return program_resource_location(res, array_index);
 211 }
 212
 213 unsigned
 214 _mesa_count_active_attribs(struct gl_shader_program *shProg)
 215 {
 216    if (!shProg->data->LinkStatus
 217        || shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL) {
 218       return 0;
 219    }
 220
 221    struct gl_program_resource *res = shProg->data->ProgramResourceList;
 222    unsigned count = 0;
 223    for (unsigned j = 0; j < shProg->data->NumProgramResourceList;
 224         j++, res++) {
 225       if (res->Type == GL_PROGRAM_INPUT &&
 226           res->StageReferences & (1 << MESA_SHADER_VERTEX))
 227          count++;
 228    }
 229    return count;
 230 }
 231
 232
 233 size_t
 234 _mesa_longest_attribute_name_length(struct gl_shader_program *shProg)
 235 {
 236    if (!shProg->data->LinkStatus
 237        || shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL) {
 238       return 0;
 239    }
 240
 241    struct gl_program_resource *res = shProg->data->ProgramResourceList;
 242    size_t longest = 0;
 243    for (unsigned j = 0; j < shProg->data->NumProgramResourceList;
 244         j++, res++) {
 245       if (res->Type == GL_PROGRAM_INPUT &&
 246           res->StageReferences & (1 << MESA_SHADER_VERTEX)) {
 247
 248           const size_t length = strlen(RESOURCE_VAR(res)->name);
 249           if (length >= longest)
 250              longest = length + 1;
 251       }
 252    }
 253
 254    return longest;
 255 }
 256
 257 void static
 258 bind_frag_data_location(struct gl_shader_program *const shProg,
 259                         const char *name, unsigned colorNumber,
 260                         unsigned index)
 261 {
 262    /* Replace the current value if it's already in the list.  Add
 263     * FRAG_RESULT_DATA0 because that's how the linker differentiates
 264     * between built-in attributes and user-defined attributes.
 265     */
 266    shProg->FragDataBindings->put(colorNumber + FRAG_RESULT_DATA0, name);
 267    shProg->FragDataIndexBindings->put(index, name);
 268
 269    /*
 270     * Note that this binding won't go into effect until
 271     * glLinkProgram is called again.
 272     */
 273 }
 274
 275 void GLAPIENTRY
 276 _mesa_BindFragDataLocation(GLuint program, GLuint colorNumber,
 277                            const GLchar *name)
 278 {
 279    _mesa_BindFragDataLocationIndexed(program, colorNumber, 0, name);
 280 }
 281
 282 void GLAPIENTRY
 283 _mesa_BindFragDataLocation_no_error(GLuint program, GLuint colorNumber,
 284                                     const GLchar *name)
 285 {
 286    GET_CURRENT_CONTEXT(ctx);
 287
 288    if (!name)
 289       return;
 290
 291    struct gl_shader_program *const shProg =
 292       _mesa_lookup_shader_program(ctx, program);
 293
 294    bind_frag_data_location(shProg, name, colorNumber, 0);
 295 }
 296
 297 void GLAPIENTRY
 298 _mesa_BindFragDataLocationIndexed(GLuint program, GLuint colorNumber,
 299                                   GLuint index, const GLchar *name)
 300 {
 301    GET_CURRENT_CONTEXT(ctx);
 302
 303    struct gl_shader_program *const shProg =
 304       _mesa_lookup_shader_program_err(ctx, program, "glBindFragDataLocationIndexed");
 305    if (!shProg)
 306       return;
 307
 308    if (!name)
 309       return;
 310
 311    if (strncmp(name, "gl_", 3) == 0) {
 312       _mesa_error(ctx, GL_INVALID_OPERATION, "glBindFragDataLocationIndexed(illegal name)");
 313       return;
 314    }
 315
 316    if (index > 1) {
 317       _mesa_error(ctx, GL_INVALID_VALUE, "glBindFragDataLocationIndexed(index)");
 318       return;
 319    }
 320
 321    if (index == 0 && colorNumber >= ctx->Const.MaxDrawBuffers) {
 322       _mesa_error(ctx, GL_INVALID_VALUE, "glBindFragDataLocationIndexed(colorNumber)");
 323       return;
 324    }
 325
 326    if (index == 1 && colorNumber >= ctx->Const.MaxDualSourceDrawBuffers) {
 327       _mesa_error(ctx, GL_INVALID_VALUE, "glBindFragDataLocationIndexed(colorNumber)");
 328       return;
 329    }
 330
 331    bind_frag_data_location(shProg, name, colorNumber, index);
 332 }
 333
 334 void GLAPIENTRY
 335 _mesa_BindFragDataLocationIndexed_no_error(GLuint program, GLuint colorNumber,
 336                                            GLuint index, const GLchar *name)
 337 {
 338    GET_CURRENT_CONTEXT(ctx);
 339
 340    if (!name)
 341       return;
 342
 343    struct gl_shader_program *const shProg =
 344       _mesa_lookup_shader_program(ctx, program);
 345
 346    bind_frag_data_location(shProg, name, colorNumber, index);
 347 }
 348
 349 GLint GLAPIENTRY
 350 _mesa_GetFragDataIndex(GLuint program, const GLchar *name)
 351 {
 352    GET_CURRENT_CONTEXT(ctx);
 353    struct gl_shader_program *const shProg =
 354       _mesa_lookup_shader_program_err(ctx, program, "glGetFragDataIndex");
 355
 356    if (!shProg) {
 357       return -1;
 358    }
 359
 360    if (!shProg->data->LinkStatus) {
 361       _mesa_error(ctx, GL_INVALID_OPERATION,
 362                   "glGetFragDataIndex(program not linked)");
 363       return -1;
 364    }
 365
 366    if (!name)
 367       return -1;
 368
 369    if (strncmp(name, "gl_", 3) == 0) {
 370       _mesa_error(ctx, GL_INVALID_OPERATION,
 371                   "glGetFragDataIndex(illegal name)");
 372       return -1;
 373    }
 374
 375    /* Not having a fragment shader is not an error.
 376     */
 377    if (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL)
 378       return -1;
 379
 380    return _mesa_program_resource_location_index(shProg, GL_PROGRAM_OUTPUT,
 381                                                 name);
 382 }
 383
 384 GLint GLAPIENTRY
 385 _mesa_GetFragDataLocation(GLuint program, const GLchar *name)
 386 {
 387    GET_CURRENT_CONTEXT(ctx);
 388    struct gl_shader_program *const shProg =
 389       _mesa_lookup_shader_program_err(ctx, program, "glGetFragDataLocation");
 390
 391    if (!shProg) {
 392       return -1;
 393    }
 394
 395    if (!shProg->data->LinkStatus) {
 396       _mesa_error(ctx, GL_INVALID_OPERATION,
 397                   "glGetFragDataLocation(program not linked)");
 398       return -1;
 399    }
 400
 401    if (!name)
 402       return -1;
 403
 404    if (strncmp(name, "gl_", 3) == 0) {
 405       _mesa_error(ctx, GL_INVALID_OPERATION,
 406                   "glGetFragDataLocation(illegal name)");
 407       return -1;
 408    }
 409
 410    /* Not having a fragment shader is not an error.
 411     */
 412    if (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL)
 413       return -1;
 414
 415    unsigned array_index = 0;
 416    struct gl_program_resource *res =
 417       _mesa_program_resource_find_name(shProg, GL_PROGRAM_OUTPUT, name,
 418                                        &array_index);
 419
 420    if (!res)
 421       return -1;
 422
 423    return program_resource_location(res, array_index);
 424 }
 425
 426 const char*
 427 _mesa_program_resource_name(struct gl_program_resource *res)
 428 {
 429    switch (res->Type) {
 430    case GL_UNIFORM_BLOCK:
 431    case GL_SHADER_STORAGE_BLOCK:
 432       return RESOURCE_UBO(res)->Name;
 433    case GL_TRANSFORM_FEEDBACK_VARYING:
 434       return RESOURCE_XFV(res)->Name;
 435    case GL_PROGRAM_INPUT:
 436    case GL_PROGRAM_OUTPUT:
 437       return RESOURCE_VAR(res)->name;
 438    case GL_UNIFORM:
 439    case GL_BUFFER_VARIABLE:
 440       return RESOURCE_UNI(res)->name;
 441    case GL_VERTEX_SUBROUTINE_UNIFORM:
 442    case GL_GEOMETRY_SUBROUTINE_UNIFORM:
 443    case GL_FRAGMENT_SUBROUTINE_UNIFORM:
 444    case GL_COMPUTE_SUBROUTINE_UNIFORM:
 445    case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
 446    case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
 447       return RESOURCE_UNI(res)->name + MESA_SUBROUTINE_PREFIX_LEN;
 448    case GL_VERTEX_SUBROUTINE:
 449    case GL_GEOMETRY_SUBROUTINE:
 450    case GL_FRAGMENT_SUBROUTINE:
 451    case GL_COMPUTE_SUBROUTINE:
 452    case GL_TESS_CONTROL_SUBROUTINE:
 453    case GL_TESS_EVALUATION_SUBROUTINE:
 454       return RESOURCE_SUB(res)->name;
 455    default:
 456       assert(!"support for resource type not implemented");
 457    }
 458    return NULL;
 459 }
 460
 461
 462 unsigned
 463 _mesa_program_resource_array_size(struct gl_program_resource *res)
 464 {
 465    switch (res->Type) {
 466    case GL_TRANSFORM_FEEDBACK_VARYING:
 467       return RESOURCE_XFV(res)->Size > 1 ?
 468              RESOURCE_XFV(res)->Size : 0;
 469    case GL_PROGRAM_INPUT:
 470    case GL_PROGRAM_OUTPUT:
 471       return RESOURCE_VAR(res)->type->length;
 472    case GL_UNIFORM:
 473    case GL_VERTEX_SUBROUTINE_UNIFORM:
 474    case GL_GEOMETRY_SUBROUTINE_UNIFORM:
 475    case GL_FRAGMENT_SUBROUTINE_UNIFORM:
 476    case GL_COMPUTE_SUBROUTINE_UNIFORM:
 477    case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
 478    case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
 479       return RESOURCE_UNI(res)->array_elements;
 480    case GL_BUFFER_VARIABLE:
 481       /* Unsized arrays */
 482       if (RESOURCE_UNI(res)->array_stride > 0 &&
 483           RESOURCE_UNI(res)->array_elements == 0)
 484          return 1;
 485       else
 486          return RESOURCE_UNI(res)->array_elements;
 487    case GL_VERTEX_SUBROUTINE:
 488    case GL_GEOMETRY_SUBROUTINE:
 489    case GL_FRAGMENT_SUBROUTINE:
 490    case GL_COMPUTE_SUBROUTINE:
 491    case GL_TESS_CONTROL_SUBROUTINE:
 492    case GL_TESS_EVALUATION_SUBROUTINE:
 493    case GL_ATOMIC_COUNTER_BUFFER:
 494    case GL_UNIFORM_BLOCK:
 495    case GL_SHADER_STORAGE_BLOCK:
 496       return 0;
 497    default:
 498       assert(!"support for resource type not implemented");
 499    }
 500    return 0;
 501 }
 502
 503 /**
 504  * Checks if array subscript is valid and if so sets array_index.
 505  */
 506 static bool
 507 valid_array_index(const GLchar *name, unsigned *array_index)
 508 {
 509    long idx = 0;
 510    const GLchar *out_base_name_end;
 511
 512    idx = parse_program_resource_name(name, &out_base_name_end);
 513    if (idx < 0)
 514       return false;
 515
 516    if (array_index)
 517       *array_index = idx;
 518
 519    return true;
 520 }
 521
 522 /* Find a program resource with specific name in given interface.
 523  */
 524 struct gl_program_resource *
 525 _mesa_program_resource_find_name(struct gl_shader_program *shProg,
 526                                  GLenum programInterface, const char *name,
 527                                  unsigned *array_index)
 528 {
 529    struct gl_program_resource *res = shProg->data->ProgramResourceList;
 530    for (unsigned i = 0; i < shProg->data->NumProgramResourceList;
 531         i++, res++) {
 532       if (res->Type != programInterface)
 533          continue;
 534
 535       /* Resource basename. */
 536       const char *rname = _mesa_program_resource_name(res);
 537       unsigned baselen = strlen(rname);
 538       unsigned baselen_without_array_index = baselen;
 539       const char *rname_last_square_bracket = strrchr(rname, '[');
 540       bool found = false;
 541       bool rname_has_array_index_zero = false;
 542       /* From ARB_program_interface_query spec:
 543        *
 544        * "uint GetProgramResourceIndex(uint program, enum programInterface,
 545        *                               const char *name);
 546        *  [...]
 547        *  If <name> exactly matches the name string of one of the active
 548        *  resources for <programInterface>, the index of the matched resource is
 549        *  returned. Additionally, if <name> would exactly match the name string
 550        *  of an active resource if "[0]" were appended to <name>, the index of
 551        *  the matched resource is returned. [...]"
 552        *
 553        * "A string provided to GetProgramResourceLocation or
 554        * GetProgramResourceLocationIndex is considered to match an active variable
 555        * if:
 556        *
 557        *  * the string exactly matches the name of the active variable;
 558        *
 559        *  * if the string identifies the base name of an active array, where the
 560        *    string would exactly match the name of the variable if the suffix
 561        *    "[0]" were appended to the string; [...]"
 562        */
 563       /* Remove array's index from interface block name comparison only if
 564        * array's index is zero and the resulting string length is the same
 565        * than the provided name's length.
 566        */
 567       if (rname_last_square_bracket) {
 568          baselen_without_array_index -= strlen(rname_last_square_bracket);
 569          rname_has_array_index_zero =
 570             (strcmp(rname_last_square_bracket, "[0]") == 0) &&
 571             (baselen_without_array_index == strlen(name));
 572       }
 573
 574       if (strncmp(rname, name, baselen) == 0)
 575          found = true;
 576       else if (rname_has_array_index_zero &&
 577                strncmp(rname, name, baselen_without_array_index) == 0)
 578          found = true;
 579
 580       if (found) {
 581          switch (programInterface) {
 582          case GL_UNIFORM_BLOCK:
 583          case GL_SHADER_STORAGE_BLOCK:
 584             /* Basename match, check if array or struct. */
 585             if (rname_has_array_index_zero ||
 586                 name[baselen] == '\0' ||
 587                 name[baselen] == '[' ||
 588                 name[baselen] == '.') {
 589                return res;
 590             }
 591             break;
 592          case GL_TRANSFORM_FEEDBACK_VARYING:
 593          case GL_BUFFER_VARIABLE:
 594          case GL_UNIFORM:
 595          case GL_VERTEX_SUBROUTINE_UNIFORM:
 596          case GL_GEOMETRY_SUBROUTINE_UNIFORM:
 597          case GL_FRAGMENT_SUBROUTINE_UNIFORM:
 598          case GL_COMPUTE_SUBROUTINE_UNIFORM:
 599          case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
 600          case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
 601          case GL_VERTEX_SUBROUTINE:
 602          case GL_GEOMETRY_SUBROUTINE:
 603          case GL_FRAGMENT_SUBROUTINE:
 604          case GL_COMPUTE_SUBROUTINE:
 605          case GL_TESS_CONTROL_SUBROUTINE:
 606          case GL_TESS_EVALUATION_SUBROUTINE:
 607             if (name[baselen] == '.') {
 608                return res;
 609             }
 610             /* fall-through */
 611          case GL_PROGRAM_INPUT:
 612          case GL_PROGRAM_OUTPUT:
 613             if (name[baselen] == '\0') {
 614                return res;
 615             } else if (name[baselen] == '[' &&
 616                 valid_array_index(name, array_index)) {
 617                return res;
 618             }
 619             break;
 620          default:
 621             assert(!"not implemented for given interface");
 622          }
 623       }
 624    }
 625    return NULL;
 626 }
 627
 628 static GLuint
 629 calc_resource_index(struct gl_shader_program *shProg,
 630                     struct gl_program_resource *res)
 631 {
 632    unsigned i;
 633    GLuint index = 0;
 634    for (i = 0; i < shProg->data->NumProgramResourceList; i++) {
 635       if (&shProg->data->ProgramResourceList[i] == res)
 636          return index;
 637       if (shProg->data->ProgramResourceList[i].Type == res->Type)
 638          index++;
 639    }
 640    return GL_INVALID_INDEX;
 641 }
 642
 643 /**
 644  * Calculate index for the given resource.
 645  */
 646 GLuint
 647 _mesa_program_resource_index(struct gl_shader_program *shProg,
 648                              struct gl_program_resource *res)
 649 {
 650    if (!res)
 651       return GL_INVALID_INDEX;
 652
 653    switch (res->Type) {
 654    case GL_ATOMIC_COUNTER_BUFFER:
 655       return RESOURCE_ATC(res) - shProg->data->AtomicBuffers;
 656    case GL_VERTEX_SUBROUTINE:
 657    case GL_GEOMETRY_SUBROUTINE:
 658    case GL_FRAGMENT_SUBROUTINE:
 659    case GL_COMPUTE_SUBROUTINE:
 660    case GL_TESS_CONTROL_SUBROUTINE:
 661    case GL_TESS_EVALUATION_SUBROUTINE:
 662       return RESOURCE_SUB(res)->index;
 663    case GL_UNIFORM_BLOCK:
 664    case GL_SHADER_STORAGE_BLOCK:
 665    case GL_TRANSFORM_FEEDBACK_BUFFER:
 666    case GL_TRANSFORM_FEEDBACK_VARYING:
 667    default:
 668       return calc_resource_index(shProg, res);
 669    }
 670 }
 671
 672 /**
 673  * Find a program resource that points to given data.
 674  */
 675 static struct gl_program_resource*
 676 program_resource_find_data(struct gl_shader_program *shProg, void *data)
 677 {
 678    struct gl_program_resource *res = shProg->data->ProgramResourceList;
 679    for (unsigned i = 0; i < shProg->data->NumProgramResourceList;
 680         i++, res++) {
 681       if (res->Data == data)
 682          return res;
 683    }
 684    return NULL;
 685 }
 686
 687 /* Find a program resource with specific index in given interface.
 688  */
 689 struct gl_program_resource *
 690 _mesa_program_resource_find_index(struct gl_shader_program *shProg,
 691                                   GLenum programInterface, GLuint index)
 692 {
 693    struct gl_program_resource *res = shProg->data->ProgramResourceList;
 694    int idx = -1;
 695
 696    for (unsigned i = 0; i < shProg->data->NumProgramResourceList;
 697         i++, res++) {
 698       if (res->Type != programInterface)
 699          continue;
 700
 701       switch (res->Type) {
 702       case GL_UNIFORM_BLOCK:
 703       case GL_ATOMIC_COUNTER_BUFFER:
 704       case GL_SHADER_STORAGE_BLOCK:
 705       case GL_TRANSFORM_FEEDBACK_BUFFER:
 706          if (_mesa_program_resource_index(shProg, res) == index)
 707             return res;
 708          break;
 709       case GL_TRANSFORM_FEEDBACK_VARYING:
 710       case GL_PROGRAM_INPUT:
 711       case GL_PROGRAM_OUTPUT:
 712       case GL_UNIFORM:
 713       case GL_VERTEX_SUBROUTINE_UNIFORM:
 714       case GL_GEOMETRY_SUBROUTINE_UNIFORM:
 715       case GL_FRAGMENT_SUBROUTINE_UNIFORM:
 716       case GL_COMPUTE_SUBROUTINE_UNIFORM:
 717       case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
 718       case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
 719       case GL_VERTEX_SUBROUTINE:
 720       case GL_GEOMETRY_SUBROUTINE:
 721       case GL_FRAGMENT_SUBROUTINE:
 722       case GL_COMPUTE_SUBROUTINE:
 723       case GL_TESS_CONTROL_SUBROUTINE:
 724       case GL_TESS_EVALUATION_SUBROUTINE:
 725       case GL_BUFFER_VARIABLE:
 726          if (++idx == (int) index)
 727             return res;
 728          break;
 729       default:
 730          assert(!"not implemented for given interface");
 731       }
 732    }
 733    return NULL;
 734 }
 735
 736 /* Function returns if resource name is expected to have index
 737  * appended into it.
 738  *
 739  *
 740  * Page 61 (page 73 of the PDF) in section 2.11 of the OpenGL ES 3.0
 741  * spec says:
 742  *
 743  *     "If the active uniform is an array, the uniform name returned in
 744  *     name will always be the name of the uniform array appended with
 745  *     "[0]"."
 746  *
 747  * The same text also appears in the OpenGL 4.2 spec.  It does not,
 748  * however, appear in any previous spec.  Previous specifications are
 749  * ambiguous in this regard.  However, either name can later be passed
 750  * to glGetUniformLocation (and related APIs), so there shouldn't be any
 751  * harm in always appending "[0]" to uniform array names.
 752  */
 753 static bool
 754 add_index_to_name(struct gl_program_resource *res)
 755 {
 756    /* Transform feedback varyings have array index already appended
 757     * in their names.
 758     */
 759    return res->Type != GL_TRANSFORM_FEEDBACK_VARYING;
 760 }
 761
 762 /* Get name length of a program resource. This consists of
 763  * base name + 3 for '[0]' if resource is an array.
 764  */
 765 extern unsigned
 766 _mesa_program_resource_name_len(struct gl_program_resource *res)
 767 {
 768    unsigned length = strlen(_mesa_program_resource_name(res));
 769    if (_mesa_program_resource_array_size(res) && add_index_to_name(res))
 770       length += 3;
 771    return length;
 772 }
 773
 774 /* Get full name of a program resource.
 775  */
 776 bool
 777 _mesa_get_program_resource_name(struct gl_shader_program *shProg,
 778                                 GLenum programInterface, GLuint index,
 779                                 GLsizei bufSize, GLsizei *length,
 780                                 GLchar *name, const char *caller)
 781 {
 782    GET_CURRENT_CONTEXT(ctx);
 783
 784    /* Find resource with given interface and index. */
 785    struct gl_program_resource *res =
 786       _mesa_program_resource_find_index(shProg, programInterface, index);
 787
 788    /* The error INVALID_VALUE is generated if <index> is greater than
 789    * or equal to the number of entries in the active resource list for
 790    * <programInterface>.
 791    */
 792    if (!res) {
 793       _mesa_error(ctx, GL_INVALID_VALUE, "%s(index %u)", caller, index);
 794       return false;
 795    }
 796
 797    if (bufSize < 0) {
 798       _mesa_error(ctx, GL_INVALID_VALUE, "%s(bufSize %d)", caller, bufSize);
 799       return false;
 800    }
 801
 802    GLsizei localLength;
 803
 804    if (length == NULL)
 805       length = &localLength;
 806
 807    _mesa_copy_string(name, bufSize, length, _mesa_program_resource_name(res));
 808
 809    if (_mesa_program_resource_array_size(res) && add_index_to_name(res)) {
 810       int i;
 811
 812       /* The comparison is strange because *length does *NOT* include the
 813        * terminating NUL, but maxLength does.
 814        */
 815       for (i = 0; i < 3 && (*length + i + 1) < bufSize; i++)
 816          name[*length + i] = "[0]"[i];
 817
 818       name[*length + i] = '\0';
 819       *length += i;
 820    }
 821    return true;
 822 }
 823
 824 static GLint
 825 program_resource_location(struct gl_program_resource *res, unsigned array_index)
 826 {
 827    switch (res->Type) {
 828    case GL_PROGRAM_INPUT: {
 829       const gl_shader_variable *var = RESOURCE_VAR(res);
 830
 831       if (var->location == -1)
 832          return -1;
 833
 834       /* If the input is an array, fail if the index is out of bounds. */
 835       if (array_index > 0
 836           && array_index >= var->type->length) {
 837          return -1;
 838       }
 839       return var->location +
 840              (array_index * var->type->without_array()->matrix_columns);
 841    }
 842    case GL_PROGRAM_OUTPUT:
 843       if (RESOURCE_VAR(res)->location == -1)
 844          return -1;
 845
 846       /* If the output is an array, fail if the index is out of bounds. */
 847       if (array_index > 0
 848           && array_index >= RESOURCE_VAR(res)->type->length) {
 849          return -1;
 850       }
 851       return RESOURCE_VAR(res)->location + array_index;
 852    case GL_UNIFORM:
 853       /* If the uniform is built-in, fail. */
 854       if (RESOURCE_UNI(res)->builtin)
 855          return -1;
 856
 857      /* From page 79 of the OpenGL 4.2 spec:
 858       *
 859       *     "A valid name cannot be a structure, an array of structures, or any
 860       *     portion of a single vector or a matrix."
 861       */
 862       if (RESOURCE_UNI(res)->type->without_array()->is_record())
 863          return -1;
 864
 865       /* From the GL_ARB_uniform_buffer_object spec:
 866        *
 867        *     "The value -1 will be returned if <name> does not correspond to an
 868        *     active uniform variable name in <program>, if <name> is associated
 869        *     with a named uniform block, or if <name> starts with the reserved
 870        *     prefix "gl_"."
 871        */
 872       if (RESOURCE_UNI(res)->block_index != -1 ||
 873           RESOURCE_UNI(res)->atomic_buffer_index != -1)
 874          return -1;
 875
 876       /* fallthrough */
 877    case GL_VERTEX_SUBROUTINE_UNIFORM:
 878    case GL_GEOMETRY_SUBROUTINE_UNIFORM:
 879    case GL_FRAGMENT_SUBROUTINE_UNIFORM:
 880    case GL_COMPUTE_SUBROUTINE_UNIFORM:
 881    case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
 882    case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
 883       /* If the uniform is an array, fail if the index is out of bounds. */
 884       if (array_index > 0
 885           && array_index >= RESOURCE_UNI(res)->array_elements) {
 886          return -1;
 887       }
 888
 889       /* location in remap table + array element offset */
 890       return RESOURCE_UNI(res)->remap_location + array_index;
 891    default:
 892       return -1;
 893    }
 894 }
 895
 896 /**
 897  * Function implements following location queries:
 898  *    glGetUniformLocation
 899  */
 900 GLint
 901 _mesa_program_resource_location(struct gl_shader_program *shProg,
 902                                 GLenum programInterface, const char *name)
 903 {
 904    unsigned array_index = 0;
 905    struct gl_program_resource *res =
 906       _mesa_program_resource_find_name(shProg, programInterface, name,
 907                                        &array_index);
 908
 909    /* Resource not found. */
 910    if (!res)
 911       return -1;
 912
 913    return program_resource_location(res, array_index);
 914 }
 915
 916 /**
 917  * Function implements following index queries:
 918  *    glGetFragDataIndex
 919  */
 920 GLint
 921 _mesa_program_resource_location_index(struct gl_shader_program *shProg,
 922                                       GLenum programInterface, const char *name)
 923 {
 924    struct gl_program_resource *res =
 925       _mesa_program_resource_find_name(shProg, programInterface, name, NULL);
 926
 927    /* Non-existent variable or resource is not referenced by fragment stage. */
 928    if (!res || !(res->StageReferences & (1 << MESA_SHADER_FRAGMENT)))
 929       return -1;
 930
 931    /* From OpenGL 4.5 spec, 7.3 Program Objects
 932     * "The value -1 will be returned by either command...
 933     *  ... or if name identifies an active variable that does not have a
 934     * valid location assigned.
 935     */
 936    if (RESOURCE_VAR(res)->location == -1)
 937       return -1;
 938    return RESOURCE_VAR(res)->index;
 939 }
 940
 941 static uint8_t
 942 stage_from_enum(GLenum ref)
 943 {
 944    switch (ref) {
 945    case GL_REFERENCED_BY_VERTEX_SHADER:
 946       return MESA_SHADER_VERTEX;
 947    case GL_REFERENCED_BY_TESS_CONTROL_SHADER:
 948       return MESA_SHADER_TESS_CTRL;
 949    case GL_REFERENCED_BY_TESS_EVALUATION_SHADER:
 950       return MESA_SHADER_TESS_EVAL;
 951    case GL_REFERENCED_BY_GEOMETRY_SHADER:
 952       return MESA_SHADER_GEOMETRY;
 953    case GL_REFERENCED_BY_FRAGMENT_SHADER:
 954       return MESA_SHADER_FRAGMENT;
 955    case GL_REFERENCED_BY_COMPUTE_SHADER:
 956       return MESA_SHADER_COMPUTE;
 957    default:
 958       assert(!"shader stage not supported");
 959       return MESA_SHADER_STAGES;
 960    }
 961 }
 962
 963 /**
 964  * Check if resource is referenced by given 'referenced by' stage enum.
 965  * ATC and UBO resources hold stage references of their own.
 966  */
 967 static bool
 968 is_resource_referenced(struct gl_shader_program *shProg,
 969                        struct gl_program_resource *res,
 970                        GLuint index, uint8_t stage)
 971 {
 972    /* First, check if we even have such a stage active. */
 973    if (!shProg->_LinkedShaders[stage])
 974       return false;
 975
 976    if (res->Type == GL_ATOMIC_COUNTER_BUFFER)
 977       return RESOURCE_ATC(res)->StageReferences[stage];
 978
 979    if (res->Type == GL_UNIFORM_BLOCK)
 980       return shProg->data->UniformBlocks[index].stageref & (1 << stage);
 981
 982    if (res->Type == GL_SHADER_STORAGE_BLOCK)
 983       return shProg->data->ShaderStorageBlocks[index].stageref & (1 << stage);
 984
 985    return res->StageReferences & (1 << stage);
 986 }
 987
 988 static unsigned
 989 get_buffer_property(struct gl_shader_program *shProg,
 990                     struct gl_program_resource *res, const GLenum prop,
 991                     GLint *val, const char *caller)
 992 {
 993    GET_CURRENT_CONTEXT(ctx);
 994    if (res->Type != GL_UNIFORM_BLOCK &&
 995        res->Type != GL_ATOMIC_COUNTER_BUFFER &&
 996        res->Type != GL_SHADER_STORAGE_BLOCK &&
 997        res->Type != GL_TRANSFORM_FEEDBACK_BUFFER)
 998       goto invalid_operation;
 999
1000    if (res->Type == GL_UNIFORM_BLOCK) {
1001       switch (prop) {
1002       case GL_BUFFER_BINDING:
1003          *val = RESOURCE_UBO(res)->Binding;
1004          return 1;
1005       case GL_BUFFER_DATA_SIZE:
1006          *val = RESOURCE_UBO(res)->UniformBufferSize;
1007          return 1;
1008       case GL_NUM_ACTIVE_VARIABLES:
1009          *val = 0;
1010          for (unsigned i = 0; i < RESOURCE_UBO(res)->NumUniforms; i++) {
1011             const char *iname = RESOURCE_UBO(res)->Uniforms[i].IndexName;
1012             struct gl_program_resource *uni =
1013                _mesa_program_resource_find_name(shProg, GL_UNIFORM, iname,
1014                                                 NULL);
1015             if (!uni)
1016                continue;
1017             (*val)++;
1018          }
1019          return 1;
1020       case GL_ACTIVE_VARIABLES: {
1021          unsigned num_values = 0;
1022          for (unsigned i = 0; i < RESOURCE_UBO(res)->NumUniforms; i++) {
1023             const char *iname = RESOURCE_UBO(res)->Uniforms[i].IndexName;
1024             struct gl_program_resource *uni =
1025                _mesa_program_resource_find_name(shProg, GL_UNIFORM, iname,
1026                                                 NULL);
1027             if (!uni)
1028                continue;
1029             *val++ =
1030                _mesa_program_resource_index(shProg, uni);
1031             num_values++;
1032          }
1033          return num_values;
1034       }
1035       }
1036    } else if (res->Type == GL_SHADER_STORAGE_BLOCK) {
1037       switch (prop) {
1038       case GL_BUFFER_BINDING:
1039          *val = RESOURCE_UBO(res)->Binding;
1040          return 1;
1041       case GL_BUFFER_DATA_SIZE:
1042          *val = RESOURCE_UBO(res)->UniformBufferSize;
1043          return 1;
1044       case GL_NUM_ACTIVE_VARIABLES:
1045          *val = 0;
1046          for (unsigned i = 0; i < RESOURCE_UBO(res)->NumUniforms; i++) {
1047             const char *iname = RESOURCE_UBO(res)->Uniforms[i].IndexName;
1048             struct gl_program_resource *uni =
1049                _mesa_program_resource_find_name(shProg, GL_BUFFER_VARIABLE,
1050                                                 iname, NULL);
1051             if (!uni)
1052                continue;
1053             (*val)++;
1054          }
1055          return 1;
1056       case GL_ACTIVE_VARIABLES: {
1057          unsigned num_values = 0;
1058          for (unsigned i = 0; i < RESOURCE_UBO(res)->NumUniforms; i++) {
1059             const char *iname = RESOURCE_UBO(res)->Uniforms[i].IndexName;
1060             struct gl_program_resource *uni =
1061                _mesa_program_resource_find_name(shProg, GL_BUFFER_VARIABLE,
1062                                                 iname, NULL);
1063             if (!uni)
1064                continue;
1065             *val++ =
1066                _mesa_program_resource_index(shProg, uni);
1067             num_values++;
1068          }
1069          return num_values;
1070       }
1071       }
1072    } else if (res->Type == GL_ATOMIC_COUNTER_BUFFER) {
1073       switch (prop) {
1074       case GL_BUFFER_BINDING:
1075          *val = RESOURCE_ATC(res)->Binding;
1076          return 1;
1077       case GL_BUFFER_DATA_SIZE:
1078          *val = RESOURCE_ATC(res)->MinimumSize;
1079          return 1;
1080       case GL_NUM_ACTIVE_VARIABLES:
1081          *val = RESOURCE_ATC(res)->NumUniforms;
1082          return 1;
1083       case GL_ACTIVE_VARIABLES:
1084          for (unsigned i = 0; i < RESOURCE_ATC(res)->NumUniforms; i++) {
1085             /* Active atomic buffer contains index to UniformStorage. Find
1086              * out gl_program_resource via data pointer and then calculate
1087              * index of that uniform.
1088              */
1089             unsigned idx = RESOURCE_ATC(res)->Uniforms[i];
1090             struct gl_program_resource *uni =
1091                program_resource_find_data(shProg,
1092                                           &shProg->data->UniformStorage[idx]);
1093             assert(uni);
1094             *val++ = _mesa_program_resource_index(shProg, uni);
1095          }
1096          return RESOURCE_ATC(res)->NumUniforms;
1097       }
1098    } else if (res->Type == GL_TRANSFORM_FEEDBACK_BUFFER) {
1099       switch (prop) {
1100       case GL_BUFFER_BINDING:
1101          *val = RESOURCE_XFB(res)->Binding;
1102          return 1;
1103       case GL_NUM_ACTIVE_VARIABLES:
1104          *val = RESOURCE_XFB(res)->NumVaryings;
1105          return 1;
1106       case GL_ACTIVE_VARIABLES:
1107          struct gl_transform_feedback_info *linked_xfb =
1108             shProg->last_vert_prog->sh.LinkedTransformFeedback;
1109          for (int i = 0; i < linked_xfb->NumVarying; i++) {
1110             unsigned index = linked_xfb->Varyings[i].BufferIndex;
1111             struct gl_program_resource *buf_res =
1112                _mesa_program_resource_find_index(shProg,
1113                                                  GL_TRANSFORM_FEEDBACK_BUFFER,
1114                                                  index);
1115             assert(buf_res);
1116             if (res == buf_res) {
1117                *val++ = i;
1118             }
1119          }
1120          return RESOURCE_XFB(res)->NumVaryings;
1121       }
1122    }
1123    assert(!"support for property type not implemented");
1124
1125 invalid_operation:
1126    _mesa_error(ctx, GL_INVALID_OPERATION, "%s(%s prop %s)", caller,
1127                _mesa_enum_to_string(res->Type),
1128                _mesa_enum_to_string(prop));
1129
1130    return 0;
1131 }
1132
1133 unsigned
1134 _mesa_program_resource_prop(struct gl_shader_program *shProg,
1135                             struct gl_program_resource *res, GLuint index,
1136                             const GLenum prop, GLint *val, const char *caller)
1137 {
1138    GET_CURRENT_CONTEXT(ctx);
1139
1140 #define VALIDATE_TYPE(type)\
1141    if (res->Type != type)\
1142       goto invalid_operation;
1143
1144 #define VALIDATE_TYPE_2(type1, type2)\
1145    if (res->Type != type1 && res->Type != type2)\
1146       goto invalid_operation;
1147
1148    switch(prop) {
1149    case GL_NAME_LENGTH:
1150       switch (res->Type) {
1151       case GL_ATOMIC_COUNTER_BUFFER:
1152       case GL_TRANSFORM_FEEDBACK_BUFFER:
1153          goto invalid_operation;
1154       default:
1155          /* Resource name length + terminator. */
1156          *val = _mesa_program_resource_name_len(res) + 1;
1157       }
1158       return 1;
1159    case GL_TYPE:
1160       switch (res->Type) {
1161       case GL_UNIFORM:
1162       case GL_BUFFER_VARIABLE:
1163          *val = RESOURCE_UNI(res)->type->gl_type;
1164          return 1;
1165       case GL_PROGRAM_INPUT:
1166       case GL_PROGRAM_OUTPUT:
1167          *val = RESOURCE_VAR(res)->type->gl_type;
1168          return 1;
1169       case GL_TRANSFORM_FEEDBACK_VARYING:
1170          *val = RESOURCE_XFV(res)->Type;
1171          return 1;
1172       default:
1173          goto invalid_operation;
1174       }
1175    case GL_ARRAY_SIZE:
1176       switch (res->Type) {
1177       case GL_UNIFORM:
1178       case GL_BUFFER_VARIABLE:
1179       case GL_VERTEX_SUBROUTINE_UNIFORM:
1180       case GL_GEOMETRY_SUBROUTINE_UNIFORM:
1181       case GL_FRAGMENT_SUBROUTINE_UNIFORM:
1182       case GL_COMPUTE_SUBROUTINE_UNIFORM:
1183       case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
1184       case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
1185
1186          /* Test if a buffer variable is an array or an unsized array.
1187           * Unsized arrays return zero as array size.
1188           */
1189          if (RESOURCE_UNI(res)->is_shader_storage &&
1190              RESOURCE_UNI(res)->array_stride > 0)
1191             *val = RESOURCE_UNI(res)->array_elements;
1192          else
1193             *val = MAX2(RESOURCE_UNI(res)->array_elements, 1);
1194          return 1;
1195       case GL_PROGRAM_INPUT:
1196       case GL_PROGRAM_OUTPUT:
1197          *val = MAX2(_mesa_program_resource_array_size(res), 1);
1198          return 1;
1199       case GL_TRANSFORM_FEEDBACK_VARYING:
1200          *val = RESOURCE_XFV(res)->Size;
1201          return 1;
1202       default:
1203          goto invalid_operation;
1204       }
1205    case GL_OFFSET:
1206       switch (res->Type) {
1207       case GL_UNIFORM:
1208       case GL_BUFFER_VARIABLE:
1209          *val = RESOURCE_UNI(res)->offset;
1210          return 1;
1211       case GL_TRANSFORM_FEEDBACK_VARYING:
1212          *val = RESOURCE_XFV(res)->Offset;
1213          return 1;
1214       default:
1215          goto invalid_operation;
1216       }
1217    case GL_BLOCK_INDEX:
1218       VALIDATE_TYPE_2(GL_UNIFORM, GL_BUFFER_VARIABLE);
1219       *val = RESOURCE_UNI(res)->block_index;
1220       return 1;
1221    case GL_ARRAY_STRIDE:
1222       VALIDATE_TYPE_2(GL_UNIFORM, GL_BUFFER_VARIABLE);
1223       *val = RESOURCE_UNI(res)->array_stride;
1224       return 1;
1225    case GL_MATRIX_STRIDE:
1226       VALIDATE_TYPE_2(GL_UNIFORM, GL_BUFFER_VARIABLE);
1227       *val = RESOURCE_UNI(res)->matrix_stride;
1228       return 1;
1229    case GL_IS_ROW_MAJOR:
1230       VALIDATE_TYPE_2(GL_UNIFORM, GL_BUFFER_VARIABLE);
1231       *val = RESOURCE_UNI(res)->row_major;
1232       return 1;
1233    case GL_ATOMIC_COUNTER_BUFFER_INDEX:
1234       VALIDATE_TYPE(GL_UNIFORM);
1235       *val = RESOURCE_UNI(res)->atomic_buffer_index;
1236       return 1;
1237    case GL_BUFFER_BINDING:
1238    case GL_BUFFER_DATA_SIZE:
1239    case GL_NUM_ACTIVE_VARIABLES:
1240    case GL_ACTIVE_VARIABLES:
1241       return get_buffer_property(shProg, res, prop, val, caller);
1242    case GL_REFERENCED_BY_COMPUTE_SHADER:
1243       if (!_mesa_has_compute_shaders(ctx))
1244          goto invalid_enum;
1245       /* fallthrough */
1246    case GL_REFERENCED_BY_VERTEX_SHADER:
1247    case GL_REFERENCED_BY_TESS_CONTROL_SHADER:
1248    case GL_REFERENCED_BY_TESS_EVALUATION_SHADER:
1249    case GL_REFERENCED_BY_GEOMETRY_SHADER:
1250    case GL_REFERENCED_BY_FRAGMENT_SHADER:
1251       switch (res->Type) {
1252       case GL_UNIFORM:
1253       case GL_PROGRAM_INPUT:
1254       case GL_PROGRAM_OUTPUT:
1255       case GL_UNIFORM_BLOCK:
1256       case GL_BUFFER_VARIABLE:
1257       case GL_SHADER_STORAGE_BLOCK:
1258       case GL_ATOMIC_COUNTER_BUFFER:
1259          *val = is_resource_referenced(shProg, res, index,
1260                                        stage_from_enum(prop));
1261          return 1;
1262       default:
1263          goto invalid_operation;
1264       }
1265    case GL_LOCATION:
1266       switch (res->Type) {
1267       case GL_UNIFORM:
1268       case GL_VERTEX_SUBROUTINE_UNIFORM:
1269       case GL_GEOMETRY_SUBROUTINE_UNIFORM:
1270       case GL_FRAGMENT_SUBROUTINE_UNIFORM:
1271       case GL_COMPUTE_SUBROUTINE_UNIFORM:
1272       case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
1273       case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
1274       case GL_PROGRAM_INPUT:
1275       case GL_PROGRAM_OUTPUT:
1276          *val = program_resource_location(res, 0);
1277          return 1;
1278       default:
1279          goto invalid_operation;
1280       }
1281    case GL_LOCATION_COMPONENT:
1282       switch (res->Type) {
1283       case GL_PROGRAM_INPUT:
1284       case GL_PROGRAM_OUTPUT:
1285          *val = RESOURCE_VAR(res)->component;
1286          return 1;
1287       default:
1288          goto invalid_operation;
1289       }
1290    case GL_LOCATION_INDEX: {
1291       int tmp;
1292       if (res->Type != GL_PROGRAM_OUTPUT)
1293          goto invalid_operation;
1294       tmp = program_resource_location(res, 0);
1295       if (tmp == -1)
1296          *val = -1;
1297       else
1298          *val = _mesa_program_resource_location_index(shProg, res->Type,
1299                                                       RESOURCE_VAR(res)->name);
1300       return 1;
1301    }
1302    case GL_NUM_COMPATIBLE_SUBROUTINES:
1303       if (res->Type != GL_VERTEX_SUBROUTINE_UNIFORM &&
1304           res->Type != GL_FRAGMENT_SUBROUTINE_UNIFORM &&
1305           res->Type != GL_GEOMETRY_SUBROUTINE_UNIFORM &&
1306           res->Type != GL_COMPUTE_SUBROUTINE_UNIFORM &&
1307           res->Type != GL_TESS_CONTROL_SUBROUTINE_UNIFORM &&
1308           res->Type != GL_TESS_EVALUATION_SUBROUTINE_UNIFORM)
1309          goto invalid_operation;
1310       *val = RESOURCE_UNI(res)->num_compatible_subroutines;
1311       return 1;
1312    case GL_COMPATIBLE_SUBROUTINES: {
1313       const struct gl_uniform_storage *uni;
1314       struct gl_program *p;
1315       unsigned count, i;
1316       int j;
1317
1318       if (res->Type != GL_VERTEX_SUBROUTINE_UNIFORM &&
1319           res->Type != GL_FRAGMENT_SUBROUTINE_UNIFORM &&
1320           res->Type != GL_GEOMETRY_SUBROUTINE_UNIFORM &&
1321           res->Type != GL_COMPUTE_SUBROUTINE_UNIFORM &&
1322           res->Type != GL_TESS_CONTROL_SUBROUTINE_UNIFORM &&
1323           res->Type != GL_TESS_EVALUATION_SUBROUTINE_UNIFORM)
1324          goto invalid_operation;
1325       uni = RESOURCE_UNI(res);
1326
1327       p = shProg->_LinkedShaders[_mesa_shader_stage_from_subroutine_uniform(res->Type)]->Program;
1328       count = 0;
1329       for (i = 0; i < p->sh.NumSubroutineFunctions; i++) {
1330          struct gl_subroutine_function *fn = &p->sh.SubroutineFunctions[i];
1331          for (j = 0; j < fn->num_compat_types; j++) {
1332             if (fn->types[j] == uni->type) {
1333                val[count++] = i;
1334                break;
1335             }
1336          }
1337       }
1338       return count;
1339    }
1340
1341    case GL_TOP_LEVEL_ARRAY_SIZE:
1342       VALIDATE_TYPE(GL_BUFFER_VARIABLE);
1343       *val = RESOURCE_UNI(res)->top_level_array_size;
1344       return 1;
1345
1346    case GL_TOP_LEVEL_ARRAY_STRIDE:
1347       VALIDATE_TYPE(GL_BUFFER_VARIABLE);
1348       *val = RESOURCE_UNI(res)->top_level_array_stride;
1349       return 1;
1350
1351    /* GL_ARB_tessellation_shader */
1352    case GL_IS_PER_PATCH:
1353       switch (res->Type) {
1354       case GL_PROGRAM_INPUT:
1355       case GL_PROGRAM_OUTPUT:
1356          *val = RESOURCE_VAR(res)->patch;
1357          return 1;
1358       default:
1359          goto invalid_operation;
1360       }
1361
1362    case GL_TRANSFORM_FEEDBACK_BUFFER_INDEX:
1363       VALIDATE_TYPE(GL_TRANSFORM_FEEDBACK_VARYING);
1364       *val = RESOURCE_XFV(res)->BufferIndex;
1365       return 1;
1366    case GL_TRANSFORM_FEEDBACK_BUFFER_STRIDE:
1367       VALIDATE_TYPE(GL_TRANSFORM_FEEDBACK_BUFFER);
1368       *val = RESOURCE_XFB(res)->Stride * 4;
1369       return 1;
1370
1371    default:
1372       goto invalid_enum;
1373    }
1374
1375 #undef VALIDATE_TYPE
1376 #undef VALIDATE_TYPE_2
1377
1378 invalid_enum:
1379    _mesa_error(ctx, GL_INVALID_ENUM, "%s(%s prop %s)", caller,
1380                _mesa_enum_to_string(res->Type),
1381                _mesa_enum_to_string(prop));
1382    return 0;
1383
1384 invalid_operation:
1385    _mesa_error(ctx, GL_INVALID_OPERATION, "%s(%s prop %s)", caller,
1386                _mesa_enum_to_string(res->Type),
1387                _mesa_enum_to_string(prop));
1388    return 0;
1389 }
1390
1391 extern void
1392 _mesa_get_program_resourceiv(struct gl_shader_program *shProg,
1393                              GLenum programInterface, GLuint index, GLsizei propCount,
1394                              const GLenum *props, GLsizei bufSize,
1395                              GLsizei *length, GLint *params)
1396 {
1397    GET_CURRENT_CONTEXT(ctx);
1398    GLint *val = (GLint *) params;
1399    const GLenum *prop = props;
1400    GLsizei amount = 0;
1401
1402    struct gl_program_resource *res =
1403       _mesa_program_resource_find_index(shProg, programInterface, index);
1404
1405    /* No such resource found or bufSize negative. */
1406    if (!res || bufSize < 0) {
1407       _mesa_error(ctx, GL_INVALID_VALUE,
1408                   "glGetProgramResourceiv(%s index %d bufSize %d)",
1409                   _mesa_enum_to_string(programInterface), index, bufSize);
1410       return;
1411    }
1412
1413    /* Write propCount values until error occurs or bufSize reached. */
1414    for (int i = 0; i < propCount && i < bufSize; i++, val++, prop++) {
1415       int props_written =
1416          _mesa_program_resource_prop(shProg, res, index, *prop, val,
1417                                      "glGetProgramResourceiv");
1418
1419       /* Error happened. */
1420       if (props_written == 0)
1421          return;
1422
1423       amount += props_written;
1424    }
1425
1426    /* If <length> is not NULL, the actual number of integer values
1427     * written to <params> will be written to <length>.
1428     */
1429    if (length)
1430       *length = amount;
1431 }
1432
1433 static bool
1434 validate_io(struct gl_program *producer, struct gl_program *consumer)
1435 {
1436    if (producer->sh.data->linked_stages == consumer->sh.data->linked_stages)
1437       return true;
1438
1439    const bool producer_is_array_stage =
1440       producer->info.stage == MESA_SHADER_TESS_CTRL;
1441    const bool consumer_is_array_stage =
1442       consumer->info.stage == MESA_SHADER_GEOMETRY ||
1443       consumer->info.stage == MESA_SHADER_TESS_CTRL ||
1444       consumer->info.stage == MESA_SHADER_TESS_EVAL;
1445
1446    bool valid = true;
1447
1448    gl_shader_variable const **outputs =
1449       (gl_shader_variable const **) calloc(producer->sh.data->NumProgramResourceList,
1450                                            sizeof(gl_shader_variable *));
1451    if (outputs == NULL)
1452       return false;
1453
1454    /* Section 7.4.1 (Shader Interface Matching) of the OpenGL ES 3.1 spec
1455     * says:
1456     *
1457     *    At an interface between program objects, the set of inputs and
1458     *    outputs are considered to match exactly if and only if:
1459     *
1460     *    - Every declared input variable has a matching output, as described
1461     *      above.
1462     *    - There are no user-defined output variables declared without a
1463     *      matching input variable declaration.
1464     *
1465     * Every input has an output, and every output has an input.  Scan the list
1466     * of producer resources once, and generate the list of outputs.  As inputs
1467     * and outputs are matched, remove the matched outputs from the set.  At
1468     * the end, the set must be empty.  If the set is not empty, then there is
1469     * some output that did not have an input.
1470     */
1471    unsigned num_outputs = 0;
1472    for (unsigned i = 0; i < producer->sh.data->NumProgramResourceList; i++) {
1473       struct gl_program_resource *res =
1474          &producer->sh.data->ProgramResourceList[i];
1475
1476       if (res->Type != GL_PROGRAM_OUTPUT)
1477          continue;
1478
1479       gl_shader_variable const *const var = RESOURCE_VAR(res);
1480
1481       /* Section 7.4.1 (Shader Interface Matching) of the OpenGL ES 3.1 spec
1482        * says:
1483        *
1484        *    Built-in inputs or outputs do not affect interface matching.
1485        */
1486       if (is_gl_identifier(var->name))
1487          continue;
1488
1489       outputs[num_outputs++] = var;
1490    }
1491
1492    unsigned match_index = 0;
1493    for (unsigned i = 0; i < consumer->sh.data->NumProgramResourceList; i++) {
1494       struct gl_program_resource *res =
1495          &consumer->sh.data->ProgramResourceList[i];
1496
1497       if (res->Type != GL_PROGRAM_INPUT)
1498          continue;
1499
1500       gl_shader_variable const *const consumer_var = RESOURCE_VAR(res);
1501       gl_shader_variable const *producer_var = NULL;
1502
1503       if (is_gl_identifier(consumer_var->name))
1504          continue;
1505
1506       /* Inputs with explicit locations match other outputs with explicit
1507        * locations by location instead of by name.
1508        */
1509       if (consumer_var->explicit_location) {
1510          for (unsigned j = 0; j < num_outputs; j++) {
1511             const gl_shader_variable *const var = outputs[j];
1512
1513             if (var->explicit_location &&
1514                 consumer_var->location == var->location) {
1515                producer_var = var;
1516                match_index = j;
1517                break;
1518             }
1519          }
1520       } else {
1521          for (unsigned j = 0; j < num_outputs; j++) {
1522             const gl_shader_variable *const var = outputs[j];
1523
1524             if (!var->explicit_location &&
1525                 strcmp(consumer_var->name, var->name) == 0) {
1526                producer_var = var;
1527                match_index = j;
1528                break;
1529             }
1530          }
1531       }
1532
1533       /* Section 7.4.1 (Shader Interface Matching) of the OpenGL ES 3.1 spec
1534        * says:
1535        *
1536        *    - An output variable is considered to match an input variable in
1537        *      the subsequent shader if:
1538        *
1539        *      - the two variables match in name, type, and qualification; or
1540        *
1541        *      - the two variables are declared with the same location
1542        *        qualifier and match in type and qualification.
1543        */
1544       if (producer_var == NULL) {
1545          valid = false;
1546          goto out;
1547       }
1548
1549       /* An output cannot match more than one input, so remove the output from
1550        * the set of possible outputs.
1551        */
1552       outputs[match_index] = NULL;
1553       num_outputs--;
1554       if (match_index < num_outputs)
1555          outputs[match_index] = outputs[num_outputs];
1556
1557       /* Section 7.4.1 (Shader Interface Matching) of the ES 3.2 spec says:
1558        *
1559        *    "Tessellation control shader per-vertex output variables and
1560        *     blocks and tessellation control, tessellation evaluation, and
1561        *     geometry shader per-vertex input variables and blocks are
1562        *     required to be declared as arrays, with each element representing
1563        *     input or output values for a single vertex of a multi-vertex
1564        *     primitive. For the purposes of interface matching, such variables
1565        *     and blocks are treated as though they were not declared as
1566        *     arrays."
1567        *
1568        * So we unwrap those types before matching.
1569        */
1570       const glsl_type *consumer_type = consumer_var->type;
1571       const glsl_type *consumer_interface_type = consumer_var->interface_type;
1572       const glsl_type *producer_type = producer_var->type;
1573       const glsl_type *producer_interface_type = producer_var->interface_type;
1574
1575       if (consumer_is_array_stage) {
1576          if (consumer_interface_type) {
1577             /* the interface is the array; the underlying types should match */
1578             if (consumer_interface_type->is_array() && !consumer_var->patch)
1579                consumer_interface_type = consumer_interface_type->fields.array;
1580          } else {
1581             if (consumer_type->is_array() && !consumer_var->patch)
1582                consumer_type = consumer_type->fields.array;
1583          }
1584       }
1585
1586       if (producer_is_array_stage) {
1587          if (producer_interface_type) {
1588             /* the interface is the array; the underlying types should match */
1589             if (producer_interface_type->is_array() && !producer_var->patch)
1590                producer_interface_type = producer_interface_type->fields.array;
1591          } else {
1592             if (producer_type->is_array() && !producer_var->patch)
1593                producer_type = producer_type->fields.array;
1594          }
1595       }
1596
1597       if (producer_type != consumer_type) {
1598          valid = false;
1599          goto out;
1600       }
1601
1602       if (producer_interface_type != consumer_interface_type) {
1603          valid = false;
1604          goto out;
1605       }
1606
1607       /* Section 9.2.2 (Separable Programs) of the GLSL ES spec says:
1608        *
1609        *    Qualifier Class|  Qualifier  |in/out
1610        *    ---------------+-------------+------
1611        *    Storage        |     in      |
1612        *                   |     out     |  N/A
1613        *                   |   uniform   |
1614        *    ---------------+-------------+------
1615        *    Auxiliary      |   centroid  |   No
1616        *    ---------------+-------------+------
1617        *                   |   location  |  Yes
1618        *                   | Block layout|  N/A
1619        *                   |   binding   |  N/A
1620        *                   |   offset    |  N/A
1621        *                   |   format    |  N/A
1622        *    ---------------+-------------+------
1623        *    Interpolation  |   smooth    |
1624        *                   |    flat     |  Yes
1625        *    ---------------+-------------+------
1626        *                   |    lowp     |
1627        *    Precision      |   mediump   |  Yes
1628        *                   |    highp    |
1629        *    ---------------+-------------+------
1630        *    Variance       |  invariant  |   No
1631        *    ---------------+-------------+------
1632        *    Memory         |     all     |  N/A
1633        *
1634        * Note that location mismatches are detected by the loops above that
1635        * find the producer variable that goes with the consumer variable.
1636        */
1637       unsigned producer_interpolation = producer_var->interpolation;
1638       unsigned consumer_interpolation = consumer_var->interpolation;
1639       if (producer_interpolation == INTERP_MODE_NONE)
1640          producer_interpolation = INTERP_MODE_SMOOTH;
1641       if (consumer_interpolation == INTERP_MODE_NONE)
1642          consumer_interpolation = INTERP_MODE_SMOOTH;
1643       if (producer_interpolation != consumer_interpolation) {
1644          valid = false;
1645          goto out;
1646       }
1647
1648       if (producer_var->precision != consumer_var->precision) {
1649          valid = false;
1650          goto out;
1651       }
1652
1653       if (producer_var->outermost_struct_type != consumer_var->outermost_struct_type) {
1654          valid = false;
1655          goto out;
1656       }
1657    }
1658
1659  out:
1660    free(outputs);
1661    return valid && num_outputs == 0;
1662 }
1663
1664 /**
1665  * Validate inputs against outputs in a program pipeline.
1666  */
1667 extern "C" bool
1668 _mesa_validate_pipeline_io(struct gl_pipeline_object *pipeline)
1669 {
1670    struct gl_program **prog = (struct gl_program **) pipeline->CurrentProgram;
1671
1672    /* Find first active stage in pipeline. */
1673    unsigned idx, prev = 0;
1674    for (idx = 0; idx < ARRAY_SIZE(pipeline->CurrentProgram); idx++) {
1675       if (prog[idx]) {
1676          prev = idx;
1677          break;
1678       }
1679    }
1680
1681    for (idx = prev + 1; idx < ARRAY_SIZE(pipeline->CurrentProgram); idx++) {
1682       if (prog[idx]) {
1683          /* Pipeline might include both non-compute and a compute program, do
1684           * not attempt to validate varyings between non-compute and compute
1685           * stage.
1686           */
1687          if (prog[idx]->info.stage == MESA_SHADER_COMPUTE)
1688             break;
1689
1690          if (!validate_io(prog[prev], prog[idx]))
1691             return false;
1692
1693          prev = idx;
1694       }
1695    }
1696    return true;
1697 }