src/glsl/builtin_variables.cpp

   1 /*
   2  * Copyright © 2010 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 #include "ir.h"
  25 #include "glsl_parser_extras.h"
  26 #include "glsl_symbol_table.h"
  27 #include "main/core.h"
  28 #include "main/uniforms.h"
  29 #include "program/prog_parameter.h"
  30 #include "program/prog_statevars.h"
  31 #include "program/prog_instruction.h"
  32
  33 static const struct gl_builtin_uniform_element gl_NumSamples_elements[] = {
  34    {NULL, {STATE_NUM_SAMPLES, 0, 0}, SWIZZLE_XXXX}
  35 };
  36
  37 static const struct gl_builtin_uniform_element gl_DepthRange_elements[] = {
  38    {"near", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_XXXX},
  39    {"far", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_YYYY},
  40    {"diff", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_ZZZZ},
  41 };
  42
  43 static const struct gl_builtin_uniform_element gl_ClipPlane_elements[] = {
  44    {NULL, {STATE_CLIPPLANE, 0, 0}, SWIZZLE_XYZW}
  45 };
  46
  47 static const struct gl_builtin_uniform_element gl_Point_elements[] = {
  48    {"size", {STATE_POINT_SIZE}, SWIZZLE_XXXX},
  49    {"sizeMin", {STATE_POINT_SIZE}, SWIZZLE_YYYY},
  50    {"sizeMax", {STATE_POINT_SIZE}, SWIZZLE_ZZZZ},
  51    {"fadeThresholdSize", {STATE_POINT_SIZE}, SWIZZLE_WWWW},
  52    {"distanceConstantAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_XXXX},
  53    {"distanceLinearAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_YYYY},
  54    {"distanceQuadraticAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_ZZZZ},
  55 };
  56
  57 static const struct gl_builtin_uniform_element gl_FrontMaterial_elements[] = {
  58    {"emission", {STATE_MATERIAL, 0, STATE_EMISSION}, SWIZZLE_XYZW},
  59    {"ambient", {STATE_MATERIAL, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
  60    {"diffuse", {STATE_MATERIAL, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
  61    {"specular", {STATE_MATERIAL, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
  62    {"shininess", {STATE_MATERIAL, 0, STATE_SHININESS}, SWIZZLE_XXXX},
  63 };
  64
  65 static const struct gl_builtin_uniform_element gl_BackMaterial_elements[] = {
  66    {"emission", {STATE_MATERIAL, 1, STATE_EMISSION}, SWIZZLE_XYZW},
  67    {"ambient", {STATE_MATERIAL, 1, STATE_AMBIENT}, SWIZZLE_XYZW},
  68    {"diffuse", {STATE_MATERIAL, 1, STATE_DIFFUSE}, SWIZZLE_XYZW},
  69    {"specular", {STATE_MATERIAL, 1, STATE_SPECULAR}, SWIZZLE_XYZW},
  70    {"shininess", {STATE_MATERIAL, 1, STATE_SHININESS}, SWIZZLE_XXXX},
  71 };
  72
  73 static const struct gl_builtin_uniform_element gl_LightSource_elements[] = {
  74    {"ambient", {STATE_LIGHT, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
  75    {"diffuse", {STATE_LIGHT, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
  76    {"specular", {STATE_LIGHT, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
  77    {"position", {STATE_LIGHT, 0, STATE_POSITION}, SWIZZLE_XYZW},
  78    {"halfVector", {STATE_LIGHT, 0, STATE_HALF_VECTOR}, SWIZZLE_XYZW},
  79    {"spotDirection", {STATE_LIGHT, 0, STATE_SPOT_DIRECTION},
  80     MAKE_SWIZZLE4(SWIZZLE_X,
  81                   SWIZZLE_Y,
  82                   SWIZZLE_Z,
  83                   SWIZZLE_Z)},
  84    {"spotCosCutoff", {STATE_LIGHT, 0, STATE_SPOT_DIRECTION}, SWIZZLE_WWWW},
  85    {"spotCutoff", {STATE_LIGHT, 0, STATE_SPOT_CUTOFF}, SWIZZLE_XXXX},
  86    {"spotExponent", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_WWWW},
  87    {"constantAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_XXXX},
  88    {"linearAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_YYYY},
  89    {"quadraticAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_ZZZZ},
  90 };
  91
  92 static const struct gl_builtin_uniform_element gl_LightModel_elements[] = {
  93    {"ambient", {STATE_LIGHTMODEL_AMBIENT, 0}, SWIZZLE_XYZW},
  94 };
  95
  96 static const struct gl_builtin_uniform_element gl_FrontLightModelProduct_elements[] = {
  97    {"sceneColor", {STATE_LIGHTMODEL_SCENECOLOR, 0}, SWIZZLE_XYZW},
  98 };
  99
 100 static const struct gl_builtin_uniform_element gl_BackLightModelProduct_elements[] = {
 101    {"sceneColor", {STATE_LIGHTMODEL_SCENECOLOR, 1}, SWIZZLE_XYZW},
 102 };
 103
 104 static const struct gl_builtin_uniform_element gl_FrontLightProduct_elements[] = {
 105    {"ambient", {STATE_LIGHTPROD, 0, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
 106    {"diffuse", {STATE_LIGHTPROD, 0, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
 107    {"specular", {STATE_LIGHTPROD, 0, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
 108 };
 109
 110 static const struct gl_builtin_uniform_element gl_BackLightProduct_elements[] = {
 111    {"ambient", {STATE_LIGHTPROD, 0, 1, STATE_AMBIENT}, SWIZZLE_XYZW},
 112    {"diffuse", {STATE_LIGHTPROD, 0, 1, STATE_DIFFUSE}, SWIZZLE_XYZW},
 113    {"specular", {STATE_LIGHTPROD, 0, 1, STATE_SPECULAR}, SWIZZLE_XYZW},
 114 };
 115
 116 static const struct gl_builtin_uniform_element gl_TextureEnvColor_elements[] = {
 117    {NULL, {STATE_TEXENV_COLOR, 0}, SWIZZLE_XYZW},
 118 };
 119
 120 static const struct gl_builtin_uniform_element gl_EyePlaneS_elements[] = {
 121    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_S}, SWIZZLE_XYZW},
 122 };
 123
 124 static const struct gl_builtin_uniform_element gl_EyePlaneT_elements[] = {
 125    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_T}, SWIZZLE_XYZW},
 126 };
 127
 128 static const struct gl_builtin_uniform_element gl_EyePlaneR_elements[] = {
 129    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_R}, SWIZZLE_XYZW},
 130 };
 131
 132 static const struct gl_builtin_uniform_element gl_EyePlaneQ_elements[] = {
 133    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_Q}, SWIZZLE_XYZW},
 134 };
 135
 136 static const struct gl_builtin_uniform_element gl_ObjectPlaneS_elements[] = {
 137    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_S}, SWIZZLE_XYZW},
 138 };
 139
 140 static const struct gl_builtin_uniform_element gl_ObjectPlaneT_elements[] = {
 141    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_T}, SWIZZLE_XYZW},
 142 };
 143
 144 static const struct gl_builtin_uniform_element gl_ObjectPlaneR_elements[] = {
 145    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_R}, SWIZZLE_XYZW},
 146 };
 147
 148 static const struct gl_builtin_uniform_element gl_ObjectPlaneQ_elements[] = {
 149    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_Q}, SWIZZLE_XYZW},
 150 };
 151
 152 static const struct gl_builtin_uniform_element gl_Fog_elements[] = {
 153    {"color", {STATE_FOG_COLOR}, SWIZZLE_XYZW},
 154    {"density", {STATE_FOG_PARAMS}, SWIZZLE_XXXX},
 155    {"start", {STATE_FOG_PARAMS}, SWIZZLE_YYYY},
 156    {"end", {STATE_FOG_PARAMS}, SWIZZLE_ZZZZ},
 157    {"scale", {STATE_FOG_PARAMS}, SWIZZLE_WWWW},
 158 };
 159
 160 static const struct gl_builtin_uniform_element gl_NormalScale_elements[] = {
 161    {NULL, {STATE_NORMAL_SCALE}, SWIZZLE_XXXX},
 162 };
 163
 164 static const struct gl_builtin_uniform_element gl_BumpRotMatrix0MESA_elements[] = {
 165    {NULL, {STATE_INTERNAL, STATE_ROT_MATRIX_0}, SWIZZLE_XYZW},
 166 };
 167
 168 static const struct gl_builtin_uniform_element gl_BumpRotMatrix1MESA_elements[] = {
 169    {NULL, {STATE_INTERNAL, STATE_ROT_MATRIX_1}, SWIZZLE_XYZW},
 170 };
 171
 172 static const struct gl_builtin_uniform_element gl_FogParamsOptimizedMESA_elements[] = {
 173    {NULL, {STATE_INTERNAL, STATE_FOG_PARAMS_OPTIMIZED}, SWIZZLE_XYZW},
 174 };
 175
 176 static const struct gl_builtin_uniform_element gl_CurrentAttribVertMESA_elements[] = {
 177    {NULL, {STATE_INTERNAL, STATE_CURRENT_ATTRIB, 0}, SWIZZLE_XYZW},
 178 };
 179
 180 static const struct gl_builtin_uniform_element gl_CurrentAttribFragMESA_elements[] = {
 181    {NULL, {STATE_INTERNAL, STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED, 0}, SWIZZLE_XYZW},
 182 };
 183
 184 #define MATRIX(name, statevar, modifier)                                \
 185    static const struct gl_builtin_uniform_element name ## _elements[] = { \
 186       { NULL, { statevar, 0, 0, 0, modifier}, SWIZZLE_XYZW },           \
 187       { NULL, { statevar, 0, 1, 1, modifier}, SWIZZLE_XYZW },           \
 188       { NULL, { statevar, 0, 2, 2, modifier}, SWIZZLE_XYZW },           \
 189       { NULL, { statevar, 0, 3, 3, modifier}, SWIZZLE_XYZW },           \
 190    }
 191
 192 MATRIX(gl_ModelViewMatrix,
 193        STATE_MODELVIEW_MATRIX, STATE_MATRIX_TRANSPOSE);
 194 MATRIX(gl_ModelViewMatrixInverse,
 195        STATE_MODELVIEW_MATRIX, STATE_MATRIX_INVTRANS);
 196 MATRIX(gl_ModelViewMatrixTranspose,
 197        STATE_MODELVIEW_MATRIX, 0);
 198 MATRIX(gl_ModelViewMatrixInverseTranspose,
 199        STATE_MODELVIEW_MATRIX, STATE_MATRIX_INVERSE);
 200
 201 MATRIX(gl_ProjectionMatrix,
 202        STATE_PROJECTION_MATRIX, STATE_MATRIX_TRANSPOSE);
 203 MATRIX(gl_ProjectionMatrixInverse,
 204        STATE_PROJECTION_MATRIX, STATE_MATRIX_INVTRANS);
 205 MATRIX(gl_ProjectionMatrixTranspose,
 206        STATE_PROJECTION_MATRIX, 0);
 207 MATRIX(gl_ProjectionMatrixInverseTranspose,
 208        STATE_PROJECTION_MATRIX, STATE_MATRIX_INVERSE);
 209
 210 MATRIX(gl_ModelViewProjectionMatrix,
 211        STATE_MVP_MATRIX, STATE_MATRIX_TRANSPOSE);
 212 MATRIX(gl_ModelViewProjectionMatrixInverse,
 213        STATE_MVP_MATRIX, STATE_MATRIX_INVTRANS);
 214 MATRIX(gl_ModelViewProjectionMatrixTranspose,
 215        STATE_MVP_MATRIX, 0);
 216 MATRIX(gl_ModelViewProjectionMatrixInverseTranspose,
 217        STATE_MVP_MATRIX, STATE_MATRIX_INVERSE);
 218
 219 MATRIX(gl_TextureMatrix,
 220        STATE_TEXTURE_MATRIX, STATE_MATRIX_TRANSPOSE);
 221 MATRIX(gl_TextureMatrixInverse,
 222        STATE_TEXTURE_MATRIX, STATE_MATRIX_INVTRANS);
 223 MATRIX(gl_TextureMatrixTranspose,
 224        STATE_TEXTURE_MATRIX, 0);
 225 MATRIX(gl_TextureMatrixInverseTranspose,
 226        STATE_TEXTURE_MATRIX, STATE_MATRIX_INVERSE);
 227
 228 static const struct gl_builtin_uniform_element gl_NormalMatrix_elements[] = {
 229    { NULL, { STATE_MODELVIEW_MATRIX, 0, 0, 0, STATE_MATRIX_INVERSE},
 230      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 231    { NULL, { STATE_MODELVIEW_MATRIX, 0, 1, 1, STATE_MATRIX_INVERSE},
 232      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 233    { NULL, { STATE_MODELVIEW_MATRIX, 0, 2, 2, STATE_MATRIX_INVERSE},
 234      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 235 };
 236
 237 #undef MATRIX
 238
 239 #define STATEVAR(name) {#name, name ## _elements, Elements(name ## _elements)}
 240
 241 static const struct gl_builtin_uniform_desc _mesa_builtin_uniform_desc[] = {
 242    STATEVAR(gl_NumSamples),
 243    STATEVAR(gl_DepthRange),
 244    STATEVAR(gl_ClipPlane),
 245    STATEVAR(gl_Point),
 246    STATEVAR(gl_FrontMaterial),
 247    STATEVAR(gl_BackMaterial),
 248    STATEVAR(gl_LightSource),
 249    STATEVAR(gl_LightModel),
 250    STATEVAR(gl_FrontLightModelProduct),
 251    STATEVAR(gl_BackLightModelProduct),
 252    STATEVAR(gl_FrontLightProduct),
 253    STATEVAR(gl_BackLightProduct),
 254    STATEVAR(gl_TextureEnvColor),
 255    STATEVAR(gl_EyePlaneS),
 256    STATEVAR(gl_EyePlaneT),
 257    STATEVAR(gl_EyePlaneR),
 258    STATEVAR(gl_EyePlaneQ),
 259    STATEVAR(gl_ObjectPlaneS),
 260    STATEVAR(gl_ObjectPlaneT),
 261    STATEVAR(gl_ObjectPlaneR),
 262    STATEVAR(gl_ObjectPlaneQ),
 263    STATEVAR(gl_Fog),
 264
 265    STATEVAR(gl_ModelViewMatrix),
 266    STATEVAR(gl_ModelViewMatrixInverse),
 267    STATEVAR(gl_ModelViewMatrixTranspose),
 268    STATEVAR(gl_ModelViewMatrixInverseTranspose),
 269
 270    STATEVAR(gl_ProjectionMatrix),
 271    STATEVAR(gl_ProjectionMatrixInverse),
 272    STATEVAR(gl_ProjectionMatrixTranspose),
 273    STATEVAR(gl_ProjectionMatrixInverseTranspose),
 274
 275    STATEVAR(gl_ModelViewProjectionMatrix),
 276    STATEVAR(gl_ModelViewProjectionMatrixInverse),
 277    STATEVAR(gl_ModelViewProjectionMatrixTranspose),
 278    STATEVAR(gl_ModelViewProjectionMatrixInverseTranspose),
 279
 280    STATEVAR(gl_TextureMatrix),
 281    STATEVAR(gl_TextureMatrixInverse),
 282    STATEVAR(gl_TextureMatrixTranspose),
 283    STATEVAR(gl_TextureMatrixInverseTranspose),
 284
 285    STATEVAR(gl_NormalMatrix),
 286    STATEVAR(gl_NormalScale),
 287
 288    STATEVAR(gl_BumpRotMatrix0MESA),
 289    STATEVAR(gl_BumpRotMatrix1MESA),
 290    STATEVAR(gl_FogParamsOptimizedMESA),
 291    STATEVAR(gl_CurrentAttribVertMESA),
 292    STATEVAR(gl_CurrentAttribFragMESA),
 293
 294    {NULL, NULL, 0}
 295 };
 296
 297
 298 namespace {
 299
 300 /**
 301  * Data structure that accumulates fields for the gl_PerVertex interface
 302  * block.
 303  */
 304 class per_vertex_accumulator
 305 {
 306 public:
 307    per_vertex_accumulator();
 308    void add_field(int slot, const glsl_type *type, const char *name);
 309    const glsl_type *construct_interface_instance() const;
 310
 311 private:
 312    glsl_struct_field fields[10];
 313    unsigned num_fields;
 314 };
 315
 316
 317 per_vertex_accumulator::per_vertex_accumulator()
 318    : fields(),
 319      num_fields(0)
 320 {
 321 }
 322
 323
 324 void
 325 per_vertex_accumulator::add_field(int slot, const glsl_type *type,
 326                                   const char *name)
 327 {
 328    assert(this->num_fields < ARRAY_SIZE(this->fields));
 329    this->fields[this->num_fields].type = type;
 330    this->fields[this->num_fields].name = name;
 331    this->fields[this->num_fields].row_major = false;
 332    this->fields[this->num_fields].location = slot;
 333    this->fields[this->num_fields].interpolation = INTERP_QUALIFIER_NONE;
 334    this->fields[this->num_fields].centroid = 0;
 335    this->fields[this->num_fields].sample = 0;
 336    this->num_fields++;
 337 }
 338
 339
 340 const glsl_type *
 341 per_vertex_accumulator::construct_interface_instance() const
 342 {
 343    return glsl_type::get_interface_instance(this->fields, this->num_fields,
 344                                             GLSL_INTERFACE_PACKING_STD140,
 345                                             "gl_PerVertex");
 346 }
 347
 348
 349 class builtin_variable_generator
 350 {
 351 public:
 352    builtin_variable_generator(exec_list *instructions,
 353                               struct _mesa_glsl_parse_state *state);
 354    void generate_constants();
 355    void generate_uniforms();
 356    void generate_vs_special_vars();
 357    void generate_gs_special_vars();
 358    void generate_fs_special_vars();
 359    void generate_cs_special_vars();
 360    void generate_varyings();
 361
 362 private:
 363    const glsl_type *array(const glsl_type *base, unsigned elements)
 364    {
 365       return glsl_type::get_array_instance(base, elements);
 366    }
 367
 368    const glsl_type *type(const char *name)
 369    {
 370       return symtab->get_type(name);
 371    }
 372
 373    ir_variable *add_input(int slot, const glsl_type *type, const char *name)
 374    {
 375       return add_variable(name, type, ir_var_shader_in, slot);
 376    }
 377
 378    ir_variable *add_output(int slot, const glsl_type *type, const char *name)
 379    {
 380       return add_variable(name, type, ir_var_shader_out, slot);
 381    }
 382
 383    ir_variable *add_system_value(int slot, const glsl_type *type,
 384                                  const char *name)
 385    {
 386       return add_variable(name, type, ir_var_system_value, slot);
 387    }
 388
 389    ir_variable *add_variable(const char *name, const glsl_type *type,
 390                              enum ir_variable_mode mode, int slot);
 391    ir_variable *add_uniform(const glsl_type *type, const char *name);
 392    ir_variable *add_const(const char *name, int value);
 393    ir_variable *add_const_ivec3(const char *name, int x, int y, int z);
 394    void add_varying(int slot, const glsl_type *type, const char *name,
 395                     const char *name_as_gs_input);
 396
 397    exec_list * const instructions;
 398    struct _mesa_glsl_parse_state * const state;
 399    glsl_symbol_table * const symtab;
 400
 401    /**
 402     * True if compatibility-profile-only variables should be included.  (In
 403     * desktop GL, these are always included when the GLSL version is 1.30 and
 404     * or below).
 405     */
 406    const bool compatibility;
 407
 408    const glsl_type * const bool_t;
 409    const glsl_type * const int_t;
 410    const glsl_type * const float_t;
 411    const glsl_type * const vec2_t;
 412    const glsl_type * const vec3_t;
 413    const glsl_type * const vec4_t;
 414    const glsl_type * const mat3_t;
 415    const glsl_type * const mat4_t;
 416
 417    per_vertex_accumulator per_vertex_in;
 418    per_vertex_accumulator per_vertex_out;
 419 };
 420
 421
 422 builtin_variable_generator::builtin_variable_generator(
 423    exec_list *instructions, struct _mesa_glsl_parse_state *state)
 424    : instructions(instructions), state(state), symtab(state->symbols),
 425      compatibility(!state->is_version(140, 100)),
 426      bool_t(glsl_type::bool_type), int_t(glsl_type::int_type),
 427      float_t(glsl_type::float_type), vec2_t(glsl_type::vec2_type),
 428      vec3_t(glsl_type::vec3_type), vec4_t(glsl_type::vec4_type),
 429      mat3_t(glsl_type::mat3_type), mat4_t(glsl_type::mat4_type)
 430 {
 431 }
 432
 433
 434 ir_variable *
 435 builtin_variable_generator::add_variable(const char *name,
 436                                          const glsl_type *type,
 437                                          enum ir_variable_mode mode, int slot)
 438 {
 439    ir_variable *var = new(symtab) ir_variable(type, name, mode);
 440    var->data.how_declared = ir_var_declared_implicitly;
 441
 442    switch (var->data.mode) {
 443    case ir_var_auto:
 444    case ir_var_shader_in:
 445    case ir_var_uniform:
 446    case ir_var_system_value:
 447       var->data.read_only = true;
 448       break;
 449    case ir_var_shader_out:
 450       break;
 451    default:
 452       /* The only variables that are added using this function should be
 453        * uniforms, shader inputs, and shader outputs, constants (which use
 454        * ir_var_auto), and system values.
 455        */
 456       assert(0);
 457       break;
 458    }
 459
 460    var->data.location = slot;
 461    var->data.explicit_location = (slot >= 0);
 462    var->data.explicit_index = 0;
 463
 464    /* Once the variable is created an initialized, add it to the symbol table
 465     * and add the declaration to the IR stream.
 466     */
 467    instructions->push_tail(var);
 468
 469    symtab->add_variable(var);
 470    return var;
 471 }
 472
 473
 474 ir_variable *
 475 builtin_variable_generator::add_uniform(const glsl_type *type,
 476                                         const char *name)
 477 {
 478    ir_variable *const uni = add_variable(name, type, ir_var_uniform, -1);
 479
 480    unsigned i;
 481    for (i = 0; _mesa_builtin_uniform_desc[i].name != NULL; i++) {
 482       if (strcmp(_mesa_builtin_uniform_desc[i].name, name) == 0) {
 483          break;
 484       }
 485    }
 486
 487    assert(_mesa_builtin_uniform_desc[i].name != NULL);
 488    const struct gl_builtin_uniform_desc* const statevar =
 489       &_mesa_builtin_uniform_desc[i];
 490
 491    const unsigned array_count = type->is_array() ? type->length : 1;
 492    uni->num_state_slots = array_count * statevar->num_elements;
 493
 494    ir_state_slot *slots =
 495       ralloc_array(uni, ir_state_slot, uni->num_state_slots);
 496
 497    uni->state_slots = slots;
 498
 499    for (unsigned a = 0; a < array_count; a++) {
 500       for (unsigned j = 0; j < statevar->num_elements; j++) {
 501          const struct gl_builtin_uniform_element *element =
 502             &statevar->elements[j];
 503
 504          memcpy(slots->tokens, element->tokens, sizeof(element->tokens));
 505          if (type->is_array()) {
 506             if (strcmp(name, "gl_CurrentAttribVertMESA") == 0 ||
 507                 strcmp(name, "gl_CurrentAttribFragMESA") == 0) {
 508                slots->tokens[2] = a;
 509             } else {
 510                slots->tokens[1] = a;
 511             }
 512          }
 513
 514          slots->swizzle = element->swizzle;
 515          slots++;
 516       }
 517    }
 518
 519    return uni;
 520 }
 521
 522
 523 ir_variable *
 524 builtin_variable_generator::add_const(const char *name, int value)
 525 {
 526    ir_variable *const var = add_variable(name, glsl_type::int_type,
 527                                          ir_var_auto, -1);
 528    var->constant_value = new(var) ir_constant(value);
 529    var->constant_initializer = new(var) ir_constant(value);
 530    var->data.has_initializer = true;
 531    return var;
 532 }
 533
 534
 535 ir_variable *
 536 builtin_variable_generator::add_const_ivec3(const char *name, int x, int y,
 537                                             int z)
 538 {
 539    ir_variable *const var = add_variable(name, glsl_type::ivec3_type,
 540                                          ir_var_auto, -1);
 541    ir_constant_data data;
 542    memset(&data, 0, sizeof(data));
 543    data.i[0] = x;
 544    data.i[1] = y;
 545    data.i[2] = z;
 546    var->constant_value = new(var) ir_constant(glsl_type::ivec3_type, &data);
 547    var->constant_initializer =
 548       new(var) ir_constant(glsl_type::ivec3_type, &data);
 549    var->data.has_initializer = true;
 550    return var;
 551 }
 552
 553
 554 void
 555 builtin_variable_generator::generate_constants()
 556 {
 557    add_const("gl_MaxVertexAttribs", state->Const.MaxVertexAttribs);
 558    add_const("gl_MaxVertexTextureImageUnits",
 559              state->Const.MaxVertexTextureImageUnits);
 560    add_const("gl_MaxCombinedTextureImageUnits",
 561              state->Const.MaxCombinedTextureImageUnits);
 562    add_const("gl_MaxTextureImageUnits", state->Const.MaxTextureImageUnits);
 563    add_const("gl_MaxDrawBuffers", state->Const.MaxDrawBuffers);
 564
 565    /* Max uniforms/varyings: GLSL ES counts these in units of vectors; desktop
 566     * GL counts them in units of "components" or "floats".
 567     */
 568    if (state->es_shader) {
 569       add_const("gl_MaxVertexUniformVectors",
 570                 state->Const.MaxVertexUniformComponents / 4);
 571       add_const("gl_MaxFragmentUniformVectors",
 572                 state->Const.MaxFragmentUniformComponents / 4);
 573
 574       /* In GLSL ES 3.00, gl_MaxVaryingVectors was split out to separate
 575        * vertex and fragment shader constants.
 576        */
 577       if (state->is_version(0, 300)) {
 578          add_const("gl_MaxVertexOutputVectors",
 579                    state->ctx->Const.Program[MESA_SHADER_VERTEX].MaxOutputComponents / 4);
 580          add_const("gl_MaxFragmentInputVectors",
 581                    state->ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxInputComponents / 4);
 582       } else {
 583          add_const("gl_MaxVaryingVectors",
 584                    state->ctx->Const.MaxVarying);
 585       }
 586    } else {
 587       add_const("gl_MaxVertexUniformComponents",
 588                 state->Const.MaxVertexUniformComponents);
 589
 590       /* Note: gl_MaxVaryingFloats was deprecated in GLSL 1.30+, but not
 591        * removed
 592        */
 593       add_const("gl_MaxVaryingFloats", state->ctx->Const.MaxVarying * 4);
 594
 595       add_const("gl_MaxFragmentUniformComponents",
 596                 state->Const.MaxFragmentUniformComponents);
 597    }
 598
 599    /* Texel offsets were introduced in ARB_shading_language_420pack (which
 600     * requires desktop GLSL version 130), and adopted into desktop GLSL
 601     * version 4.20 and GLSL ES version 3.00.
 602     */
 603    if ((state->is_version(130, 0) &&
 604         state->ARB_shading_language_420pack_enable) ||
 605       state->is_version(420, 300)) {
 606       add_const("gl_MinProgramTexelOffset",
 607                 state->Const.MinProgramTexelOffset);
 608       add_const("gl_MaxProgramTexelOffset",
 609                 state->Const.MaxProgramTexelOffset);
 610    }
 611
 612    if (state->is_version(130, 0)) {
 613       add_const("gl_MaxClipDistances", state->Const.MaxClipPlanes);
 614       add_const("gl_MaxVaryingComponents", state->ctx->Const.MaxVarying * 4);
 615    }
 616
 617    if (state->is_version(150, 0)) {
 618       add_const("gl_MaxVertexOutputComponents",
 619                 state->Const.MaxVertexOutputComponents);
 620       add_const("gl_MaxGeometryInputComponents",
 621                 state->Const.MaxGeometryInputComponents);
 622       add_const("gl_MaxGeometryOutputComponents",
 623                 state->Const.MaxGeometryOutputComponents);
 624       add_const("gl_MaxFragmentInputComponents",
 625                 state->Const.MaxFragmentInputComponents);
 626       add_const("gl_MaxGeometryTextureImageUnits",
 627                 state->Const.MaxGeometryTextureImageUnits);
 628       add_const("gl_MaxGeometryOutputVertices",
 629                 state->Const.MaxGeometryOutputVertices);
 630       add_const("gl_MaxGeometryTotalOutputComponents",
 631                 state->Const.MaxGeometryTotalOutputComponents);
 632       add_const("gl_MaxGeometryUniformComponents",
 633                 state->Const.MaxGeometryUniformComponents);
 634
 635       /* Note: the GLSL 1.50-4.40 specs require
 636        * gl_MaxGeometryVaryingComponents to be present, and to be at least 64.
 637        * But they do not define what it means (and there does not appear to be
 638        * any corresponding constant in the GL specs).  However,
 639        * ARB_geometry_shader4 defines MAX_GEOMETRY_VARYING_COMPONENTS_ARB to
 640        * be the maximum number of components available for use as geometry
 641        * outputs.  So we assume this is a synonym for
 642        * gl_MaxGeometryOutputComponents.
 643        */
 644       add_const("gl_MaxGeometryVaryingComponents",
 645                 state->Const.MaxGeometryOutputComponents);
 646    }
 647
 648    if (compatibility) {
 649       /* Note: gl_MaxLights stopped being listed as an explicit constant in
 650        * GLSL 1.30, however it continues to be referred to (as a minimum size
 651        * for compatibility-mode uniforms) all the way up through GLSL 4.30, so
 652        * this seems like it was probably an oversight.
 653        */
 654       add_const("gl_MaxLights", state->Const.MaxLights);
 655
 656       add_const("gl_MaxClipPlanes", state->Const.MaxClipPlanes);
 657
 658       /* Note: gl_MaxTextureUnits wasn't made compatibility-only until GLSL
 659        * 1.50, however this seems like it was probably an oversight.
 660        */
 661       add_const("gl_MaxTextureUnits", state->Const.MaxTextureUnits);
 662
 663       /* Note: gl_MaxTextureCoords was left out of GLSL 1.40, but it was
 664        * re-introduced in GLSL 1.50, so this seems like it was probably an
 665        * oversight.
 666        */
 667       add_const("gl_MaxTextureCoords", state->Const.MaxTextureCoords);
 668    }
 669
 670    if (state->ARB_shader_atomic_counters_enable) {
 671       add_const("gl_MaxVertexAtomicCounters",
 672                 state->Const.MaxVertexAtomicCounters);
 673       add_const("gl_MaxGeometryAtomicCounters",
 674                 state->Const.MaxGeometryAtomicCounters);
 675       add_const("gl_MaxFragmentAtomicCounters",
 676                 state->Const.MaxFragmentAtomicCounters);
 677       add_const("gl_MaxCombinedAtomicCounters",
 678                 state->Const.MaxCombinedAtomicCounters);
 679       add_const("gl_MaxAtomicCounterBindings",
 680                 state->Const.MaxAtomicBufferBindings);
 681       add_const("gl_MaxTessControlAtomicCounters", 0);
 682       add_const("gl_MaxTessEvaluationAtomicCounters", 0);
 683    }
 684
 685    if (state->is_version(430, 0) || state->ARB_compute_shader_enable) {
 686       add_const_ivec3("gl_MaxComputeWorkGroupCount",
 687                       state->Const.MaxComputeWorkGroupCount[0],
 688                       state->Const.MaxComputeWorkGroupCount[1],
 689                       state->Const.MaxComputeWorkGroupCount[2]);
 690       add_const_ivec3("gl_MaxComputeWorkGroupSize",
 691                       state->Const.MaxComputeWorkGroupSize[0],
 692                       state->Const.MaxComputeWorkGroupSize[1],
 693                       state->Const.MaxComputeWorkGroupSize[2]);
 694
 695       /* From the GLSL 4.40 spec, section 7.1 (Built-In Language Variables):
 696        *
 697        *     The built-in constant gl_WorkGroupSize is a compute-shader
 698        *     constant containing the local work-group size of the shader.  The
 699        *     size of the work group in the X, Y, and Z dimensions is stored in
 700        *     the x, y, and z components.  The constants values in
 701        *     gl_WorkGroupSize will match those specified in the required
 702        *     local_size_x, local_size_y, and local_size_z layout qualifiers
 703        *     for the current shader.  This is a constant so that it can be
 704        *     used to size arrays of memory that can be shared within the local
 705        *     work group.  It is a compile-time error to use gl_WorkGroupSize
 706        *     in a shader that does not declare a fixed local group size, or
 707        *     before that shader has declared a fixed local group size, using
 708        *     local_size_x, local_size_y, and local_size_z.
 709        *
 710        * To prevent the shader from trying to refer to gl_WorkGroupSize before
 711        * the layout declaration, we don't define it here.  Intead we define it
 712        * in ast_cs_input_layout::hir().
 713        */
 714    }
 715
 716    if (state->is_version(420, 0) ||
 717        state->ARB_shader_image_load_store_enable) {
 718       add_const("gl_MaxImageUnits",
 719                 state->Const.MaxImageUnits);
 720       add_const("gl_MaxCombinedImageUnitsAndFragmentOutputs",
 721                 state->Const.MaxCombinedImageUnitsAndFragmentOutputs);
 722       add_const("gl_MaxImageSamples",
 723                 state->Const.MaxImageSamples);
 724       add_const("gl_MaxVertexImageUniforms",
 725                 state->Const.MaxVertexImageUniforms);
 726       add_const("gl_MaxTessControlImageUniforms", 0);
 727       add_const("gl_MaxTessEvaluationImageUniforms", 0);
 728       add_const("gl_MaxGeometryImageUniforms",
 729                 state->Const.MaxGeometryImageUniforms);
 730       add_const("gl_MaxFragmentImageUniforms",
 731                 state->Const.MaxFragmentImageUniforms);
 732       add_const("gl_MaxCombinedImageUniforms",
 733                 state->Const.MaxCombinedImageUniforms);
 734    }
 735 }
 736
 737
 738 /**
 739  * Generate uniform variables (which exist in all types of shaders).
 740  */
 741 void
 742 builtin_variable_generator::generate_uniforms()
 743 {
 744    add_uniform(int_t, "gl_NumSamples");
 745    add_uniform(type("gl_DepthRangeParameters"), "gl_DepthRange");
 746    add_uniform(array(vec4_t, VERT_ATTRIB_MAX), "gl_CurrentAttribVertMESA");
 747    add_uniform(array(vec4_t, VARYING_SLOT_MAX), "gl_CurrentAttribFragMESA");
 748
 749    if (compatibility) {
 750       add_uniform(mat4_t, "gl_ModelViewMatrix");
 751       add_uniform(mat4_t, "gl_ProjectionMatrix");
 752       add_uniform(mat4_t, "gl_ModelViewProjectionMatrix");
 753       add_uniform(mat3_t, "gl_NormalMatrix");
 754       add_uniform(mat4_t, "gl_ModelViewMatrixInverse");
 755       add_uniform(mat4_t, "gl_ProjectionMatrixInverse");
 756       add_uniform(mat4_t, "gl_ModelViewProjectionMatrixInverse");
 757       add_uniform(mat4_t, "gl_ModelViewMatrixTranspose");
 758       add_uniform(mat4_t, "gl_ProjectionMatrixTranspose");
 759       add_uniform(mat4_t, "gl_ModelViewProjectionMatrixTranspose");
 760       add_uniform(mat4_t, "gl_ModelViewMatrixInverseTranspose");
 761       add_uniform(mat4_t, "gl_ProjectionMatrixInverseTranspose");
 762       add_uniform(mat4_t, "gl_ModelViewProjectionMatrixInverseTranspose");
 763       add_uniform(float_t, "gl_NormalScale");
 764       add_uniform(type("gl_LightModelParameters"), "gl_LightModel");
 765       add_uniform(vec2_t, "gl_BumpRotMatrix0MESA");
 766       add_uniform(vec2_t, "gl_BumpRotMatrix1MESA");
 767       add_uniform(vec4_t, "gl_FogParamsOptimizedMESA");
 768
 769       const glsl_type *const mat4_array_type =
 770          array(mat4_t, state->Const.MaxTextureCoords);
 771       add_uniform(mat4_array_type, "gl_TextureMatrix");
 772       add_uniform(mat4_array_type, "gl_TextureMatrixInverse");
 773       add_uniform(mat4_array_type, "gl_TextureMatrixTranspose");
 774       add_uniform(mat4_array_type, "gl_TextureMatrixInverseTranspose");
 775
 776       add_uniform(array(vec4_t, state->Const.MaxClipPlanes), "gl_ClipPlane");
 777       add_uniform(type("gl_PointParameters"), "gl_Point");
 778
 779       const glsl_type *const material_parameters_type =
 780          type("gl_MaterialParameters");
 781       add_uniform(material_parameters_type, "gl_FrontMaterial");
 782       add_uniform(material_parameters_type, "gl_BackMaterial");
 783
 784       add_uniform(array(type("gl_LightSourceParameters"),
 785                         state->Const.MaxLights),
 786                   "gl_LightSource");
 787
 788       const glsl_type *const light_model_products_type =
 789          type("gl_LightModelProducts");
 790       add_uniform(light_model_products_type, "gl_FrontLightModelProduct");
 791       add_uniform(light_model_products_type, "gl_BackLightModelProduct");
 792
 793       const glsl_type *const light_products_type =
 794          array(type("gl_LightProducts"), state->Const.MaxLights);
 795       add_uniform(light_products_type, "gl_FrontLightProduct");
 796       add_uniform(light_products_type, "gl_BackLightProduct");
 797
 798       add_uniform(array(vec4_t, state->Const.MaxTextureUnits),
 799                   "gl_TextureEnvColor");
 800
 801       const glsl_type *const texcoords_vec4 =
 802          array(vec4_t, state->Const.MaxTextureCoords);
 803       add_uniform(texcoords_vec4, "gl_EyePlaneS");
 804       add_uniform(texcoords_vec4, "gl_EyePlaneT");
 805       add_uniform(texcoords_vec4, "gl_EyePlaneR");
 806       add_uniform(texcoords_vec4, "gl_EyePlaneQ");
 807       add_uniform(texcoords_vec4, "gl_ObjectPlaneS");
 808       add_uniform(texcoords_vec4, "gl_ObjectPlaneT");
 809       add_uniform(texcoords_vec4, "gl_ObjectPlaneR");
 810       add_uniform(texcoords_vec4, "gl_ObjectPlaneQ");
 811
 812       add_uniform(type("gl_FogParameters"), "gl_Fog");
 813    }
 814 }
 815
 816
 817 /**
 818  * Generate variables which only exist in vertex shaders.
 819  */
 820 void
 821 builtin_variable_generator::generate_vs_special_vars()
 822 {
 823    if (state->is_version(130, 300))
 824       add_system_value(SYSTEM_VALUE_VERTEX_ID, int_t, "gl_VertexID");
 825    if (state->ARB_draw_instanced_enable)
 826       add_system_value(SYSTEM_VALUE_INSTANCE_ID, int_t, "gl_InstanceIDARB");
 827    if (state->ARB_draw_instanced_enable || state->is_version(140, 300))
 828       add_system_value(SYSTEM_VALUE_INSTANCE_ID, int_t, "gl_InstanceID");
 829    if (state->AMD_vertex_shader_layer_enable)
 830       add_output(VARYING_SLOT_LAYER, int_t, "gl_Layer");
 831    if (compatibility) {
 832       add_input(VERT_ATTRIB_POS, vec4_t, "gl_Vertex");
 833       add_input(VERT_ATTRIB_NORMAL, vec3_t, "gl_Normal");
 834       add_input(VERT_ATTRIB_COLOR0, vec4_t, "gl_Color");
 835       add_input(VERT_ATTRIB_COLOR1, vec4_t, "gl_SecondaryColor");
 836       add_input(VERT_ATTRIB_TEX0, vec4_t, "gl_MultiTexCoord0");
 837       add_input(VERT_ATTRIB_TEX1, vec4_t, "gl_MultiTexCoord1");
 838       add_input(VERT_ATTRIB_TEX2, vec4_t, "gl_MultiTexCoord2");
 839       add_input(VERT_ATTRIB_TEX3, vec4_t, "gl_MultiTexCoord3");
 840       add_input(VERT_ATTRIB_TEX4, vec4_t, "gl_MultiTexCoord4");
 841       add_input(VERT_ATTRIB_TEX5, vec4_t, "gl_MultiTexCoord5");
 842       add_input(VERT_ATTRIB_TEX6, vec4_t, "gl_MultiTexCoord6");
 843       add_input(VERT_ATTRIB_TEX7, vec4_t, "gl_MultiTexCoord7");
 844       add_input(VERT_ATTRIB_FOG, float_t, "gl_FogCoord");
 845    }
 846 }
 847
 848
 849 /**
 850  * Generate variables which only exist in geometry shaders.
 851  */
 852 void
 853 builtin_variable_generator::generate_gs_special_vars()
 854 {
 855    add_output(VARYING_SLOT_LAYER, int_t, "gl_Layer");
 856    if (state->ARB_viewport_array_enable)
 857       add_output(VARYING_SLOT_VIEWPORT, int_t, "gl_ViewportIndex");
 858    if (state->ARB_gpu_shader5_enable)
 859       add_system_value(SYSTEM_VALUE_INVOCATION_ID, int_t, "gl_InvocationID");
 860
 861    /* Although gl_PrimitiveID appears in tessellation control and tessellation
 862     * evaluation shaders, it has a different function there than it has in
 863     * geometry shaders, so we treat it (and its counterpart gl_PrimitiveIDIn)
 864     * as special geometry shader variables.
 865     *
 866     * Note that although the general convention of suffixing geometry shader
 867     * input varyings with "In" was not adopted into GLSL 1.50, it is used in
 868     * the specific case of gl_PrimitiveIDIn.  So we don't need to treat
 869     * gl_PrimitiveIDIn as an {ARB,EXT}_geometry_shader4-only variable.
 870     */
 871    ir_variable *var;
 872    var = add_input(VARYING_SLOT_PRIMITIVE_ID, int_t, "gl_PrimitiveIDIn");
 873    var->data.interpolation = INTERP_QUALIFIER_FLAT;
 874    var = add_output(VARYING_SLOT_PRIMITIVE_ID, int_t, "gl_PrimitiveID");
 875    var->data.interpolation = INTERP_QUALIFIER_FLAT;
 876 }
 877
 878
 879 /**
 880  * Generate variables which only exist in fragment shaders.
 881  */
 882 void
 883 builtin_variable_generator::generate_fs_special_vars()
 884 {
 885    add_input(VARYING_SLOT_POS, vec4_t, "gl_FragCoord");
 886    add_input(VARYING_SLOT_FACE, bool_t, "gl_FrontFacing");
 887    if (state->is_version(120, 100))
 888       add_input(VARYING_SLOT_PNTC, vec2_t, "gl_PointCoord");
 889
 890    if (state->is_version(150, 0)) {
 891       ir_variable *var =
 892          add_input(VARYING_SLOT_PRIMITIVE_ID, int_t, "gl_PrimitiveID");
 893       var->data.interpolation = INTERP_QUALIFIER_FLAT;
 894    }
 895
 896    /* gl_FragColor and gl_FragData were deprecated starting in desktop GLSL
 897     * 1.30, and were relegated to the compatibility profile in GLSL 4.20.
 898     * They were removed from GLSL ES 3.00.
 899     */
 900    if (compatibility || !state->is_version(420, 300)) {
 901       add_output(FRAG_RESULT_COLOR, vec4_t, "gl_FragColor");
 902       add_output(FRAG_RESULT_DATA0,
 903                  array(vec4_t, state->Const.MaxDrawBuffers), "gl_FragData");
 904    }
 905
 906    /* gl_FragDepth has always been in desktop GLSL, but did not appear in GLSL
 907     * ES 1.00.
 908     */
 909    if (state->is_version(110, 300))
 910       add_output(FRAG_RESULT_DEPTH, float_t, "gl_FragDepth");
 911
 912    if (state->ARB_shader_stencil_export_enable) {
 913       ir_variable *const var =
 914          add_output(FRAG_RESULT_STENCIL, int_t, "gl_FragStencilRefARB");
 915       if (state->ARB_shader_stencil_export_warn)
 916          var->warn_extension = "GL_ARB_shader_stencil_export";
 917    }
 918
 919    if (state->AMD_shader_stencil_export_enable) {
 920       ir_variable *const var =
 921          add_output(FRAG_RESULT_STENCIL, int_t, "gl_FragStencilRefAMD");
 922       if (state->AMD_shader_stencil_export_warn)
 923          var->warn_extension = "GL_AMD_shader_stencil_export";
 924    }
 925
 926    if (state->ARB_sample_shading_enable) {
 927       add_system_value(SYSTEM_VALUE_SAMPLE_ID, int_t, "gl_SampleID");
 928       add_system_value(SYSTEM_VALUE_SAMPLE_POS, vec2_t, "gl_SamplePosition");
 929       /* From the ARB_sample_shading specification:
 930        *    "The number of elements in the array is ceil(<s>/32), where
 931        *    <s> is the maximum number of color samples supported by the
 932        *    implementation."
 933        * Since no drivers expose more than 32x MSAA, we can simply set
 934        * the array size to 1 rather than computing it.
 935        */
 936       add_output(FRAG_RESULT_SAMPLE_MASK, array(int_t, 1), "gl_SampleMask");
 937    }
 938
 939    if (state->ARB_gpu_shader5_enable) {
 940       add_system_value(SYSTEM_VALUE_SAMPLE_MASK_IN, array(int_t, 1), "gl_SampleMaskIn");
 941    }
 942 }
 943
 944
 945 /**
 946  * Generate variables which only exist in compute shaders.
 947  */
 948 void
 949 builtin_variable_generator::generate_cs_special_vars()
 950 {
 951    /* TODO: finish this. */
 952 }
 953
 954
 955 /**
 956  * Add a single "varying" variable.  The variable's type and direction (input
 957  * or output) are adjusted as appropriate for the type of shader being
 958  * compiled.  For geometry shaders using {ARB,EXT}_geometry_shader4,
 959  * name_as_gs_input is used for the input (to avoid ambiguity).
 960  */
 961 void
 962 builtin_variable_generator::add_varying(int slot, const glsl_type *type,
 963                                         const char *name,
 964                                         const char *name_as_gs_input)
 965 {
 966    switch (state->stage) {
 967    case MESA_SHADER_GEOMETRY:
 968       this->per_vertex_in.add_field(slot, type, name);
 969       /* FALLTHROUGH */
 970    case MESA_SHADER_VERTEX:
 971       this->per_vertex_out.add_field(slot, type, name);
 972       break;
 973    case MESA_SHADER_FRAGMENT:
 974       add_input(slot, type, name);
 975       break;
 976    case MESA_SHADER_COMPUTE:
 977       /* Compute shaders don't have varyings. */
 978       break;
 979    }
 980 }
 981
 982
 983 /**
 984  * Generate variables that are used to communicate data from one shader stage
 985  * to the next ("varyings").
 986  */
 987 void
 988 builtin_variable_generator::generate_varyings()
 989 {
 990 #define ADD_VARYING(loc, type, name) \
 991    add_varying(loc, type, name, name "In")
 992
 993    /* gl_Position and gl_PointSize are not visible from fragment shaders. */
 994    if (state->stage != MESA_SHADER_FRAGMENT) {
 995       ADD_VARYING(VARYING_SLOT_POS, vec4_t, "gl_Position");
 996       ADD_VARYING(VARYING_SLOT_PSIZ, float_t, "gl_PointSize");
 997    }
 998
 999    if (state->is_version(130, 0)) {
1000        ADD_VARYING(VARYING_SLOT_CLIP_DIST0, array(float_t, 0),
1001                    "gl_ClipDistance");
1002    }
1003
1004    if (compatibility) {
1005       ADD_VARYING(VARYING_SLOT_TEX0, array(vec4_t, 0), "gl_TexCoord");
1006       ADD_VARYING(VARYING_SLOT_FOGC, float_t, "gl_FogFragCoord");
1007       if (state->stage == MESA_SHADER_FRAGMENT) {
1008          ADD_VARYING(VARYING_SLOT_COL0, vec4_t, "gl_Color");
1009          ADD_VARYING(VARYING_SLOT_COL1, vec4_t, "gl_SecondaryColor");
1010       } else {
1011          ADD_VARYING(VARYING_SLOT_CLIP_VERTEX, vec4_t, "gl_ClipVertex");
1012          ADD_VARYING(VARYING_SLOT_COL0, vec4_t, "gl_FrontColor");
1013          ADD_VARYING(VARYING_SLOT_BFC0, vec4_t, "gl_BackColor");
1014          ADD_VARYING(VARYING_SLOT_COL1, vec4_t, "gl_FrontSecondaryColor");
1015          ADD_VARYING(VARYING_SLOT_BFC1, vec4_t, "gl_BackSecondaryColor");
1016       }
1017    }
1018
1019    if (state->stage == MESA_SHADER_GEOMETRY) {
1020       const glsl_type *per_vertex_in_type =
1021          this->per_vertex_in.construct_interface_instance();
1022       add_variable("gl_in", array(per_vertex_in_type, 0),
1023                    ir_var_shader_in, -1);
1024    }
1025    if (state->stage == MESA_SHADER_VERTEX || state->stage == MESA_SHADER_GEOMETRY) {
1026       const glsl_type *per_vertex_out_type =
1027          this->per_vertex_out.construct_interface_instance();
1028       const glsl_struct_field *fields = per_vertex_out_type->fields.structure;
1029       for (unsigned i = 0; i < per_vertex_out_type->length; i++) {
1030          ir_variable *var =
1031             add_variable(fields[i].name, fields[i].type, ir_var_shader_out,
1032                          fields[i].location);
1033          var->data.interpolation = fields[i].interpolation;
1034          var->data.centroid = fields[i].centroid;
1035          var->data.sample = fields[i].sample;
1036          var->init_interface_type(per_vertex_out_type);
1037       }
1038    }
1039 }
1040
1041
1042 }; /* Anonymous namespace */
1043
1044
1045 void
1046 _mesa_glsl_initialize_variables(exec_list *instructions,
1047                                 struct _mesa_glsl_parse_state *state)
1048 {
1049    builtin_variable_generator gen(instructions, state);
1050
1051    gen.generate_constants();
1052    gen.generate_uniforms();
1053
1054    gen.generate_varyings();
1055
1056    switch (state->stage) {
1057    case MESA_SHADER_VERTEX:
1058       gen.generate_vs_special_vars();
1059       break;
1060    case MESA_SHADER_GEOMETRY:
1061       gen.generate_gs_special_vars();
1062       break;
1063    case MESA_SHADER_FRAGMENT:
1064       gen.generate_fs_special_vars();
1065       break;
1066    case MESA_SHADER_COMPUTE:
1067       gen.generate_cs_special_vars();
1068       break;
1069    }
1070 }