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
  34 static struct gl_builtin_uniform_element gl_DepthRange_elements[] = {
  35    {"near", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_XXXX},
  36    {"far", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_YYYY},
  37    {"diff", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_ZZZZ},
  38 };
  39
  40 static struct gl_builtin_uniform_element gl_ClipPlane_elements[] = {
  41    {NULL, {STATE_CLIPPLANE, 0, 0}, SWIZZLE_XYZW}
  42 };
  43
  44 static struct gl_builtin_uniform_element gl_Point_elements[] = {
  45    {"size", {STATE_POINT_SIZE}, SWIZZLE_XXXX},
  46    {"sizeMin", {STATE_POINT_SIZE}, SWIZZLE_YYYY},
  47    {"sizeMax", {STATE_POINT_SIZE}, SWIZZLE_ZZZZ},
  48    {"fadeThresholdSize", {STATE_POINT_SIZE}, SWIZZLE_WWWW},
  49    {"distanceConstantAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_XXXX},
  50    {"distanceLinearAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_YYYY},
  51    {"distanceQuadraticAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_ZZZZ},
  52 };
  53
  54 static struct gl_builtin_uniform_element gl_FrontMaterial_elements[] = {
  55    {"emission", {STATE_MATERIAL, 0, STATE_EMISSION}, SWIZZLE_XYZW},
  56    {"ambient", {STATE_MATERIAL, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
  57    {"diffuse", {STATE_MATERIAL, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
  58    {"specular", {STATE_MATERIAL, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
  59    {"shininess", {STATE_MATERIAL, 0, STATE_SHININESS}, SWIZZLE_XXXX},
  60 };
  61
  62 static struct gl_builtin_uniform_element gl_BackMaterial_elements[] = {
  63    {"emission", {STATE_MATERIAL, 1, STATE_EMISSION}, SWIZZLE_XYZW},
  64    {"ambient", {STATE_MATERIAL, 1, STATE_AMBIENT}, SWIZZLE_XYZW},
  65    {"diffuse", {STATE_MATERIAL, 1, STATE_DIFFUSE}, SWIZZLE_XYZW},
  66    {"specular", {STATE_MATERIAL, 1, STATE_SPECULAR}, SWIZZLE_XYZW},
  67    {"shininess", {STATE_MATERIAL, 1, STATE_SHININESS}, SWIZZLE_XXXX},
  68 };
  69
  70 static struct gl_builtin_uniform_element gl_LightSource_elements[] = {
  71    {"ambient", {STATE_LIGHT, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
  72    {"diffuse", {STATE_LIGHT, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
  73    {"specular", {STATE_LIGHT, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
  74    {"position", {STATE_LIGHT, 0, STATE_POSITION}, SWIZZLE_XYZW},
  75    {"halfVector", {STATE_LIGHT, 0, STATE_HALF_VECTOR}, SWIZZLE_XYZW},
  76    {"spotDirection", {STATE_LIGHT, 0, STATE_SPOT_DIRECTION},
  77     MAKE_SWIZZLE4(SWIZZLE_X,
  78                   SWIZZLE_Y,
  79                   SWIZZLE_Z,
  80                   SWIZZLE_Z)},
  81    {"spotCosCutoff", {STATE_LIGHT, 0, STATE_SPOT_DIRECTION}, SWIZZLE_WWWW},
  82    {"spotCutoff", {STATE_LIGHT, 0, STATE_SPOT_CUTOFF}, SWIZZLE_XXXX},
  83    {"spotExponent", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_WWWW},
  84    {"constantAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_XXXX},
  85    {"linearAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_YYYY},
  86    {"quadraticAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_ZZZZ},
  87 };
  88
  89 static struct gl_builtin_uniform_element gl_LightModel_elements[] = {
  90    {"ambient", {STATE_LIGHTMODEL_AMBIENT, 0}, SWIZZLE_XYZW},
  91 };
  92
  93 static struct gl_builtin_uniform_element gl_FrontLightModelProduct_elements[] = {
  94    {"sceneColor", {STATE_LIGHTMODEL_SCENECOLOR, 0}, SWIZZLE_XYZW},
  95 };
  96
  97 static struct gl_builtin_uniform_element gl_BackLightModelProduct_elements[] = {
  98    {"sceneColor", {STATE_LIGHTMODEL_SCENECOLOR, 1}, SWIZZLE_XYZW},
  99 };
 100
 101 static struct gl_builtin_uniform_element gl_FrontLightProduct_elements[] = {
 102    {"ambient", {STATE_LIGHTPROD, 0, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
 103    {"diffuse", {STATE_LIGHTPROD, 0, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
 104    {"specular", {STATE_LIGHTPROD, 0, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
 105 };
 106
 107 static struct gl_builtin_uniform_element gl_BackLightProduct_elements[] = {
 108    {"ambient", {STATE_LIGHTPROD, 0, 1, STATE_AMBIENT}, SWIZZLE_XYZW},
 109    {"diffuse", {STATE_LIGHTPROD, 0, 1, STATE_DIFFUSE}, SWIZZLE_XYZW},
 110    {"specular", {STATE_LIGHTPROD, 0, 1, STATE_SPECULAR}, SWIZZLE_XYZW},
 111 };
 112
 113 static struct gl_builtin_uniform_element gl_TextureEnvColor_elements[] = {
 114    {NULL, {STATE_TEXENV_COLOR, 0}, SWIZZLE_XYZW},
 115 };
 116
 117 static struct gl_builtin_uniform_element gl_EyePlaneS_elements[] = {
 118    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_S}, SWIZZLE_XYZW},
 119 };
 120
 121 static struct gl_builtin_uniform_element gl_EyePlaneT_elements[] = {
 122    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_T}, SWIZZLE_XYZW},
 123 };
 124
 125 static struct gl_builtin_uniform_element gl_EyePlaneR_elements[] = {
 126    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_R}, SWIZZLE_XYZW},
 127 };
 128
 129 static struct gl_builtin_uniform_element gl_EyePlaneQ_elements[] = {
 130    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_Q}, SWIZZLE_XYZW},
 131 };
 132
 133 static struct gl_builtin_uniform_element gl_ObjectPlaneS_elements[] = {
 134    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_S}, SWIZZLE_XYZW},
 135 };
 136
 137 static struct gl_builtin_uniform_element gl_ObjectPlaneT_elements[] = {
 138    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_T}, SWIZZLE_XYZW},
 139 };
 140
 141 static struct gl_builtin_uniform_element gl_ObjectPlaneR_elements[] = {
 142    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_R}, SWIZZLE_XYZW},
 143 };
 144
 145 static struct gl_builtin_uniform_element gl_ObjectPlaneQ_elements[] = {
 146    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_Q}, SWIZZLE_XYZW},
 147 };
 148
 149 static struct gl_builtin_uniform_element gl_Fog_elements[] = {
 150    {"color", {STATE_FOG_COLOR}, SWIZZLE_XYZW},
 151    {"density", {STATE_FOG_PARAMS}, SWIZZLE_XXXX},
 152    {"start", {STATE_FOG_PARAMS}, SWIZZLE_YYYY},
 153    {"end", {STATE_FOG_PARAMS}, SWIZZLE_ZZZZ},
 154    {"scale", {STATE_FOG_PARAMS}, SWIZZLE_WWWW},
 155 };
 156
 157 static struct gl_builtin_uniform_element gl_NormalScale_elements[] = {
 158    {NULL, {STATE_NORMAL_SCALE}, SWIZZLE_XXXX},
 159 };
 160
 161 static struct gl_builtin_uniform_element gl_BumpRotMatrix0MESA_elements[] = {
 162    {NULL, {STATE_INTERNAL, STATE_ROT_MATRIX_0}, SWIZZLE_XYZW},
 163 };
 164
 165 static struct gl_builtin_uniform_element gl_BumpRotMatrix1MESA_elements[] = {
 166    {NULL, {STATE_INTERNAL, STATE_ROT_MATRIX_1}, SWIZZLE_XYZW},
 167 };
 168
 169 static struct gl_builtin_uniform_element gl_FogParamsOptimizedMESA_elements[] = {
 170    {NULL, {STATE_INTERNAL, STATE_FOG_PARAMS_OPTIMIZED}, SWIZZLE_XYZW},
 171 };
 172
 173 static struct gl_builtin_uniform_element gl_CurrentAttribVertMESA_elements[] = {
 174    {NULL, {STATE_INTERNAL, STATE_CURRENT_ATTRIB, 0}, SWIZZLE_XYZW},
 175 };
 176
 177 static struct gl_builtin_uniform_element gl_CurrentAttribFragMESA_elements[] = {
 178    {NULL, {STATE_INTERNAL, STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED, 0}, SWIZZLE_XYZW},
 179 };
 180
 181 #define MATRIX(name, statevar, modifier)                                \
 182    static struct gl_builtin_uniform_element name ## _elements[] = {     \
 183       { NULL, { statevar, 0, 0, 0, modifier}, SWIZZLE_XYZW },           \
 184       { NULL, { statevar, 0, 1, 1, modifier}, SWIZZLE_XYZW },           \
 185       { NULL, { statevar, 0, 2, 2, modifier}, SWIZZLE_XYZW },           \
 186       { NULL, { statevar, 0, 3, 3, modifier}, SWIZZLE_XYZW },           \
 187    }
 188
 189 MATRIX(gl_ModelViewMatrix,
 190        STATE_MODELVIEW_MATRIX, STATE_MATRIX_TRANSPOSE);
 191 MATRIX(gl_ModelViewMatrixInverse,
 192        STATE_MODELVIEW_MATRIX, STATE_MATRIX_INVTRANS);
 193 MATRIX(gl_ModelViewMatrixTranspose,
 194        STATE_MODELVIEW_MATRIX, 0);
 195 MATRIX(gl_ModelViewMatrixInverseTranspose,
 196        STATE_MODELVIEW_MATRIX, STATE_MATRIX_INVERSE);
 197
 198 MATRIX(gl_ProjectionMatrix,
 199        STATE_PROJECTION_MATRIX, STATE_MATRIX_TRANSPOSE);
 200 MATRIX(gl_ProjectionMatrixInverse,
 201        STATE_PROJECTION_MATRIX, STATE_MATRIX_INVTRANS);
 202 MATRIX(gl_ProjectionMatrixTranspose,
 203        STATE_PROJECTION_MATRIX, 0);
 204 MATRIX(gl_ProjectionMatrixInverseTranspose,
 205        STATE_PROJECTION_MATRIX, STATE_MATRIX_INVERSE);
 206
 207 MATRIX(gl_ModelViewProjectionMatrix,
 208        STATE_MVP_MATRIX, STATE_MATRIX_TRANSPOSE);
 209 MATRIX(gl_ModelViewProjectionMatrixInverse,
 210        STATE_MVP_MATRIX, STATE_MATRIX_INVTRANS);
 211 MATRIX(gl_ModelViewProjectionMatrixTranspose,
 212        STATE_MVP_MATRIX, 0);
 213 MATRIX(gl_ModelViewProjectionMatrixInverseTranspose,
 214        STATE_MVP_MATRIX, STATE_MATRIX_INVERSE);
 215
 216 MATRIX(gl_TextureMatrix,
 217        STATE_TEXTURE_MATRIX, STATE_MATRIX_TRANSPOSE);
 218 MATRIX(gl_TextureMatrixInverse,
 219        STATE_TEXTURE_MATRIX, STATE_MATRIX_INVTRANS);
 220 MATRIX(gl_TextureMatrixTranspose,
 221        STATE_TEXTURE_MATRIX, 0);
 222 MATRIX(gl_TextureMatrixInverseTranspose,
 223        STATE_TEXTURE_MATRIX, STATE_MATRIX_INVERSE);
 224
 225 static struct gl_builtin_uniform_element gl_NormalMatrix_elements[] = {
 226    { NULL, { STATE_MODELVIEW_MATRIX, 0, 0, 0, STATE_MATRIX_INVERSE},
 227      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 228    { NULL, { STATE_MODELVIEW_MATRIX, 0, 1, 1, STATE_MATRIX_INVERSE},
 229      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 230    { NULL, { STATE_MODELVIEW_MATRIX, 0, 2, 2, STATE_MATRIX_INVERSE},
 231      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 232 };
 233
 234 #undef MATRIX
 235
 236 #define STATEVAR(name) {#name, name ## _elements, Elements(name ## _elements)}
 237
 238 static const struct gl_builtin_uniform_desc _mesa_builtin_uniform_desc[] = {
 239    STATEVAR(gl_DepthRange),
 240    STATEVAR(gl_ClipPlane),
 241    STATEVAR(gl_Point),
 242    STATEVAR(gl_FrontMaterial),
 243    STATEVAR(gl_BackMaterial),
 244    STATEVAR(gl_LightSource),
 245    STATEVAR(gl_LightModel),
 246    STATEVAR(gl_FrontLightModelProduct),
 247    STATEVAR(gl_BackLightModelProduct),
 248    STATEVAR(gl_FrontLightProduct),
 249    STATEVAR(gl_BackLightProduct),
 250    STATEVAR(gl_TextureEnvColor),
 251    STATEVAR(gl_EyePlaneS),
 252    STATEVAR(gl_EyePlaneT),
 253    STATEVAR(gl_EyePlaneR),
 254    STATEVAR(gl_EyePlaneQ),
 255    STATEVAR(gl_ObjectPlaneS),
 256    STATEVAR(gl_ObjectPlaneT),
 257    STATEVAR(gl_ObjectPlaneR),
 258    STATEVAR(gl_ObjectPlaneQ),
 259    STATEVAR(gl_Fog),
 260
 261    STATEVAR(gl_ModelViewMatrix),
 262    STATEVAR(gl_ModelViewMatrixInverse),
 263    STATEVAR(gl_ModelViewMatrixTranspose),
 264    STATEVAR(gl_ModelViewMatrixInverseTranspose),
 265
 266    STATEVAR(gl_ProjectionMatrix),
 267    STATEVAR(gl_ProjectionMatrixInverse),
 268    STATEVAR(gl_ProjectionMatrixTranspose),
 269    STATEVAR(gl_ProjectionMatrixInverseTranspose),
 270
 271    STATEVAR(gl_ModelViewProjectionMatrix),
 272    STATEVAR(gl_ModelViewProjectionMatrixInverse),
 273    STATEVAR(gl_ModelViewProjectionMatrixTranspose),
 274    STATEVAR(gl_ModelViewProjectionMatrixInverseTranspose),
 275
 276    STATEVAR(gl_TextureMatrix),
 277    STATEVAR(gl_TextureMatrixInverse),
 278    STATEVAR(gl_TextureMatrixTranspose),
 279    STATEVAR(gl_TextureMatrixInverseTranspose),
 280
 281    STATEVAR(gl_NormalMatrix),
 282    STATEVAR(gl_NormalScale),
 283
 284    STATEVAR(gl_BumpRotMatrix0MESA),
 285    STATEVAR(gl_BumpRotMatrix1MESA),
 286    STATEVAR(gl_FogParamsOptimizedMESA),
 287    STATEVAR(gl_CurrentAttribVertMESA),
 288    STATEVAR(gl_CurrentAttribFragMESA),
 289
 290    {NULL, NULL, 0}
 291 };
 292
 293
 294 namespace {
 295
 296 class builtin_variable_generator
 297 {
 298 public:
 299    builtin_variable_generator(exec_list *instructions,
 300                               struct _mesa_glsl_parse_state *state);
 301    void generate_constants();
 302    void generate_uniforms();
 303    void generate_vs_special_vars();
 304    void generate_gs_special_vars();
 305    void generate_fs_special_vars();
 306    void generate_varyings();
 307
 308 private:
 309    const glsl_type *array(const glsl_type *base, unsigned elements)
 310    {
 311       return glsl_type::get_array_instance(base, elements);
 312    }
 313
 314    const glsl_type *type(const char *name)
 315    {
 316       return symtab->get_type(name);
 317    }
 318
 319    ir_variable *add_input(int slot, const glsl_type *type, const char *name)
 320    {
 321       return add_variable(name, type, ir_var_shader_in, slot);
 322    }
 323
 324    ir_variable *add_output(int slot, const glsl_type *type, const char *name)
 325    {
 326       return add_variable(name, type, ir_var_shader_out, slot);
 327    }
 328
 329    ir_variable *add_system_value(int slot, const glsl_type *type,
 330                                  const char *name)
 331    {
 332       return add_variable(name, type, ir_var_system_value, slot);
 333    }
 334
 335    ir_variable *add_variable(const char *name, const glsl_type *type,
 336                              enum ir_variable_mode mode, int slot);
 337    ir_variable *add_uniform(const glsl_type *type, const char *name);
 338    ir_variable *add_const(const char *name, int value);
 339    void add_varying(int slot, const glsl_type *type, const char *name,
 340                     const char *name_as_gs_input);
 341
 342    exec_list * const instructions;
 343    struct _mesa_glsl_parse_state * const state;
 344    glsl_symbol_table * const symtab;
 345
 346    /**
 347     * True if compatibility-profile-only variables should be included.  (In
 348     * desktop GL, these are always included when the GLSL version is 1.30 and
 349     * or below).
 350     */
 351    const bool compatibility;
 352
 353    const glsl_type * const bool_t;
 354    const glsl_type * const int_t;
 355    const glsl_type * const float_t;
 356    const glsl_type * const vec2_t;
 357    const glsl_type * const vec3_t;
 358    const glsl_type * const vec4_t;
 359    const glsl_type * const mat3_t;
 360    const glsl_type * const mat4_t;
 361
 362    /**
 363     * Array where the contents of the gl_PerVertex interface instance are
 364     * accumulated.
 365     */
 366    glsl_struct_field per_vertex_fields[10];
 367
 368    /**
 369     * Number of elements of per_vertex_fields which have been populated.
 370     */
 371    unsigned num_per_vertex_fields;
 372 };
 373
 374
 375 builtin_variable_generator::builtin_variable_generator(
 376    exec_list *instructions, struct _mesa_glsl_parse_state *state)
 377    : instructions(instructions), state(state), symtab(state->symbols),
 378      compatibility(!state->is_version(140, 100)),
 379      bool_t(glsl_type::bool_type), int_t(glsl_type::int_type),
 380      float_t(glsl_type::float_type), vec2_t(glsl_type::vec2_type),
 381      vec3_t(glsl_type::vec3_type), vec4_t(glsl_type::vec4_type),
 382      mat3_t(glsl_type::mat3_type), mat4_t(glsl_type::mat4_type),
 383      num_per_vertex_fields(0)
 384 {
 385 }
 386
 387
 388 ir_variable *
 389 builtin_variable_generator::add_variable(const char *name,
 390                                          const glsl_type *type,
 391                                          enum ir_variable_mode mode, int slot)
 392 {
 393    ir_variable *var = new(symtab) ir_variable(type, name, mode);
 394
 395    switch (var->mode) {
 396    case ir_var_auto:
 397    case ir_var_shader_in:
 398    case ir_var_uniform:
 399    case ir_var_system_value:
 400       var->read_only = true;
 401       break;
 402    case ir_var_shader_out:
 403       break;
 404    default:
 405       /* The only variables that are added using this function should be
 406        * uniforms, shader inputs, and shader outputs, constants (which use
 407        * ir_var_auto), and system values.
 408        */
 409       assert(0);
 410       break;
 411    }
 412
 413    var->location = slot;
 414    var->explicit_location = (slot >= 0);
 415    var->explicit_index = 0;
 416
 417    /* Once the variable is created an initialized, add it to the symbol table
 418     * and add the declaration to the IR stream.
 419     */
 420    instructions->push_tail(var);
 421
 422    symtab->add_variable(var);
 423    return var;
 424 }
 425
 426
 427 ir_variable *
 428 builtin_variable_generator::add_uniform(const glsl_type *type,
 429                                         const char *name)
 430 {
 431    ir_variable *const uni = add_variable(name, type, ir_var_uniform, -1);
 432
 433    unsigned i;
 434    for (i = 0; _mesa_builtin_uniform_desc[i].name != NULL; i++) {
 435       if (strcmp(_mesa_builtin_uniform_desc[i].name, name) == 0) {
 436          break;
 437       }
 438    }
 439
 440    assert(_mesa_builtin_uniform_desc[i].name != NULL);
 441    const struct gl_builtin_uniform_desc* const statevar =
 442       &_mesa_builtin_uniform_desc[i];
 443
 444    const unsigned array_count = type->is_array() ? type->length : 1;
 445    uni->num_state_slots = array_count * statevar->num_elements;
 446
 447    ir_state_slot *slots =
 448       ralloc_array(uni, ir_state_slot, uni->num_state_slots);
 449
 450    uni->state_slots = slots;
 451
 452    for (unsigned a = 0; a < array_count; a++) {
 453       for (unsigned j = 0; j < statevar->num_elements; j++) {
 454          struct gl_builtin_uniform_element *element = &statevar->elements[j];
 455
 456          memcpy(slots->tokens, element->tokens, sizeof(element->tokens));
 457          if (type->is_array()) {
 458             if (strcmp(name, "gl_CurrentAttribVertMESA") == 0 ||
 459                 strcmp(name, "gl_CurrentAttribFragMESA") == 0) {
 460                slots->tokens[2] = a;
 461             } else {
 462                slots->tokens[1] = a;
 463             }
 464          }
 465
 466          slots->swizzle = element->swizzle;
 467          slots++;
 468       }
 469    }
 470
 471    return uni;
 472 }
 473
 474
 475 ir_variable *
 476 builtin_variable_generator::add_const(const char *name, int value)
 477 {
 478    ir_variable *const var = add_variable(name, glsl_type::int_type,
 479                                          ir_var_auto, -1);
 480    var->constant_value = new(var) ir_constant(value);
 481    var->constant_initializer = new(var) ir_constant(value);
 482    var->has_initializer = true;
 483    return var;
 484 }
 485
 486
 487 void
 488 builtin_variable_generator::generate_constants()
 489 {
 490    add_const("gl_MaxVertexAttribs", state->Const.MaxVertexAttribs);
 491    add_const("gl_MaxVertexTextureImageUnits",
 492              state->Const.MaxVertexTextureImageUnits);
 493    add_const("gl_MaxCombinedTextureImageUnits",
 494              state->Const.MaxCombinedTextureImageUnits);
 495    add_const("gl_MaxTextureImageUnits", state->Const.MaxTextureImageUnits);
 496    add_const("gl_MaxDrawBuffers", state->Const.MaxDrawBuffers);
 497
 498    /* Max uniforms/varyings: GLSL ES counts these in units of vectors; desktop
 499     * GL counts them in units of "components" or "floats".
 500     */
 501    if (state->es_shader) {
 502       add_const("gl_MaxVertexUniformVectors",
 503                 state->Const.MaxVertexUniformComponents / 4);
 504       add_const("gl_MaxFragmentUniformVectors",
 505                 state->Const.MaxFragmentUniformComponents / 4);
 506
 507       /* In GLSL ES 3.00, gl_MaxVaryingVectors was split out to separate
 508        * vertex and fragment shader constants.
 509        */
 510       if (state->is_version(0, 300)) {
 511          add_const("gl_MaxVertexOutputVectors",
 512                    state->ctx->Const.VertexProgram.MaxOutputComponents / 4);
 513          add_const("gl_MaxFragmentInputVectors",
 514                    state->ctx->Const.FragmentProgram.MaxInputComponents / 4);
 515       } else {
 516          add_const("gl_MaxVaryingVectors",
 517                    state->ctx->Const.MaxVarying);
 518       }
 519    } else {
 520       add_const("gl_MaxVertexUniformComponents",
 521                 state->Const.MaxVertexUniformComponents);
 522
 523       /* Note: gl_MaxVaryingFloats was deprecated in GLSL 1.30+, but not
 524        * removed
 525        */
 526       add_const("gl_MaxVaryingFloats", state->ctx->Const.MaxVarying * 4);
 527
 528       add_const("gl_MaxFragmentUniformComponents",
 529                 state->Const.MaxFragmentUniformComponents);
 530    }
 531
 532    /* Texel offsets were introduced in ARB_shading_language_420pack (which
 533     * requires desktop GLSL version 130), and adopted into desktop GLSL
 534     * version 4.20 and GLSL ES version 3.00.
 535     */
 536    if ((state->is_version(130, 0) &&
 537         state->ARB_shading_language_420pack_enable) ||
 538       state->is_version(420, 300)) {
 539       add_const("gl_MinProgramTexelOffset",
 540                 state->Const.MinProgramTexelOffset);
 541       add_const("gl_MaxProgramTexelOffset",
 542                 state->Const.MaxProgramTexelOffset);
 543    }
 544
 545    if (state->is_version(130, 0)) {
 546       add_const("gl_MaxClipDistances", state->Const.MaxClipPlanes);
 547       add_const("gl_MaxVaryingComponents", state->ctx->Const.MaxVarying * 4);
 548    }
 549
 550    if (compatibility) {
 551       /* Note: gl_MaxLights stopped being listed as an explicit constant in
 552        * GLSL 1.30, however it continues to be referred to (as a minimum size
 553        * for compatibility-mode uniforms) all the way up through GLSL 4.30, so
 554        * this seems like it was probably an oversight.
 555        */
 556       add_const("gl_MaxLights", state->Const.MaxLights);
 557
 558       add_const("gl_MaxClipPlanes", state->Const.MaxClipPlanes);
 559
 560       /* Note: gl_MaxTextureUnits wasn't made compatibility-only until GLSL
 561        * 1.50, however this seems like it was probably an oversight.
 562        */
 563       add_const("gl_MaxTextureUnits", state->Const.MaxTextureUnits);
 564
 565       /* Note: gl_MaxTextureCoords was left out of GLSL 1.40, but it was
 566        * re-introduced in GLSL 1.50, so this seems like it was probably an
 567        * oversight.
 568        */
 569       add_const("gl_MaxTextureCoords", state->Const.MaxTextureCoords);
 570    }
 571 }
 572
 573
 574 /**
 575  * Generate uniform variables (which exist in all types of shaders).
 576  */
 577 void
 578 builtin_variable_generator::generate_uniforms()
 579 {
 580    add_uniform(type("gl_DepthRangeParameters"), "gl_DepthRange");
 581    add_uniform(array(vec4_t, VERT_ATTRIB_MAX), "gl_CurrentAttribVertMESA");
 582    add_uniform(array(vec4_t, VARYING_SLOT_MAX), "gl_CurrentAttribFragMESA");
 583
 584    if (compatibility) {
 585       add_uniform(mat4_t, "gl_ModelViewMatrix");
 586       add_uniform(mat4_t, "gl_ProjectionMatrix");
 587       add_uniform(mat4_t, "gl_ModelViewProjectionMatrix");
 588       add_uniform(mat3_t, "gl_NormalMatrix");
 589       add_uniform(mat4_t, "gl_ModelViewMatrixInverse");
 590       add_uniform(mat4_t, "gl_ProjectionMatrixInverse");
 591       add_uniform(mat4_t, "gl_ModelViewProjectionMatrixInverse");
 592       add_uniform(mat4_t, "gl_ModelViewMatrixTranspose");
 593       add_uniform(mat4_t, "gl_ProjectionMatrixTranspose");
 594       add_uniform(mat4_t, "gl_ModelViewProjectionMatrixTranspose");
 595       add_uniform(mat4_t, "gl_ModelViewMatrixInverseTranspose");
 596       add_uniform(mat4_t, "gl_ProjectionMatrixInverseTranspose");
 597       add_uniform(mat4_t, "gl_ModelViewProjectionMatrixInverseTranspose");
 598       add_uniform(float_t, "gl_NormalScale");
 599       add_uniform(type("gl_LightModelParameters"), "gl_LightModel");
 600       add_uniform(vec2_t, "gl_BumpRotMatrix0MESA");
 601       add_uniform(vec2_t, "gl_BumpRotMatrix1MESA");
 602       add_uniform(vec4_t, "gl_FogParamsOptimizedMESA");
 603
 604       const glsl_type *const mat4_array_type =
 605          array(mat4_t, state->Const.MaxTextureCoords);
 606       add_uniform(mat4_array_type, "gl_TextureMatrix");
 607       add_uniform(mat4_array_type, "gl_TextureMatrixInverse");
 608       add_uniform(mat4_array_type, "gl_TextureMatrixTranspose");
 609       add_uniform(mat4_array_type, "gl_TextureMatrixInverseTranspose");
 610
 611       add_uniform(array(vec4_t, state->Const.MaxClipPlanes), "gl_ClipPlane");
 612       add_uniform(type("gl_PointParameters"), "gl_Point");
 613
 614       const glsl_type *const material_parameters_type =
 615          type("gl_MaterialParameters");
 616       add_uniform(material_parameters_type, "gl_FrontMaterial");
 617       add_uniform(material_parameters_type, "gl_BackMaterial");
 618
 619       add_uniform(array(type("gl_LightSourceParameters"),
 620                         state->Const.MaxLights),
 621                   "gl_LightSource");
 622
 623       const glsl_type *const light_model_products_type =
 624          type("gl_LightModelProducts");
 625       add_uniform(light_model_products_type, "gl_FrontLightModelProduct");
 626       add_uniform(light_model_products_type, "gl_BackLightModelProduct");
 627
 628       const glsl_type *const light_products_type =
 629          array(type("gl_LightProducts"), state->Const.MaxLights);
 630       add_uniform(light_products_type, "gl_FrontLightProduct");
 631       add_uniform(light_products_type, "gl_BackLightProduct");
 632
 633       add_uniform(array(vec4_t, state->Const.MaxTextureUnits),
 634                   "gl_TextureEnvColor");
 635
 636       const glsl_type *const texcoords_vec4 =
 637          array(vec4_t, state->Const.MaxTextureCoords);
 638       add_uniform(texcoords_vec4, "gl_EyePlaneS");
 639       add_uniform(texcoords_vec4, "gl_EyePlaneT");
 640       add_uniform(texcoords_vec4, "gl_EyePlaneR");
 641       add_uniform(texcoords_vec4, "gl_EyePlaneQ");
 642       add_uniform(texcoords_vec4, "gl_ObjectPlaneS");
 643       add_uniform(texcoords_vec4, "gl_ObjectPlaneT");
 644       add_uniform(texcoords_vec4, "gl_ObjectPlaneR");
 645       add_uniform(texcoords_vec4, "gl_ObjectPlaneQ");
 646
 647       add_uniform(type("gl_FogParameters"), "gl_Fog");
 648    }
 649 }
 650
 651
 652 /**
 653  * Generate variables which only exist in vertex shaders.
 654  */
 655 void
 656 builtin_variable_generator::generate_vs_special_vars()
 657 {
 658    if (state->is_version(130, 300))
 659       add_system_value(SYSTEM_VALUE_VERTEX_ID, int_t, "gl_VertexID");
 660    if (state->ARB_draw_instanced_enable)
 661       add_system_value(SYSTEM_VALUE_INSTANCE_ID, int_t, "gl_InstanceIDARB");
 662    if (state->ARB_draw_instanced_enable || state->is_version(140, 300))
 663       add_system_value(SYSTEM_VALUE_INSTANCE_ID, int_t, "gl_InstanceID");
 664    if (state->AMD_vertex_shader_layer_enable)
 665       add_output(VARYING_SLOT_LAYER, int_t, "gl_Layer");
 666    if (compatibility) {
 667       add_input(VERT_ATTRIB_POS, vec4_t, "gl_Vertex");
 668       add_input(VERT_ATTRIB_NORMAL, vec3_t, "gl_Normal");
 669       add_input(VERT_ATTRIB_COLOR0, vec4_t, "gl_Color");
 670       add_input(VERT_ATTRIB_COLOR1, vec4_t, "gl_SecondaryColor");
 671       add_input(VERT_ATTRIB_TEX0, vec4_t, "gl_MultiTexCoord0");
 672       add_input(VERT_ATTRIB_TEX1, vec4_t, "gl_MultiTexCoord1");
 673       add_input(VERT_ATTRIB_TEX2, vec4_t, "gl_MultiTexCoord2");
 674       add_input(VERT_ATTRIB_TEX3, vec4_t, "gl_MultiTexCoord3");
 675       add_input(VERT_ATTRIB_TEX4, vec4_t, "gl_MultiTexCoord4");
 676       add_input(VERT_ATTRIB_TEX5, vec4_t, "gl_MultiTexCoord5");
 677       add_input(VERT_ATTRIB_TEX6, vec4_t, "gl_MultiTexCoord6");
 678       add_input(VERT_ATTRIB_TEX7, vec4_t, "gl_MultiTexCoord7");
 679       add_input(VERT_ATTRIB_FOG, float_t, "gl_FogCoord");
 680    }
 681 }
 682
 683
 684 /**
 685  * Generate variables which only exist in geometry shaders.
 686  */
 687 void
 688 builtin_variable_generator::generate_gs_special_vars()
 689 {
 690    add_output(VARYING_SLOT_LAYER, int_t, "gl_Layer");
 691
 692    /* Although gl_PrimitiveID appears in tessellation control and tessellation
 693     * evaluation shaders, it has a different function there than it has in
 694     * geometry shaders, so we treat it (and its counterpart gl_PrimitiveIDIn)
 695     * as special geometry shader variables.
 696     *
 697     * Note that although the general convention of suffixing geometry shader
 698     * input varyings with "In" was not adopted into GLSL 1.50, it is used in
 699     * the specific case of gl_PrimitiveIDIn.  So we don't need to treat
 700     * gl_PrimitiveIDIn as an {ARB,EXT}_geometry_shader4-only variable.
 701     */
 702    ir_variable *var;
 703    var = add_input(VARYING_SLOT_PRIMITIVE_ID, int_t, "gl_PrimitiveIDIn");
 704    var->interpolation = INTERP_QUALIFIER_FLAT;
 705    var = add_output(VARYING_SLOT_PRIMITIVE_ID, int_t, "gl_PrimitiveID");
 706    var->interpolation = INTERP_QUALIFIER_FLAT;
 707 }
 708
 709
 710 /**
 711  * Generate variables which only exist in fragment shaders.
 712  */
 713 void
 714 builtin_variable_generator::generate_fs_special_vars()
 715 {
 716    add_input(VARYING_SLOT_POS, vec4_t, "gl_FragCoord");
 717    add_input(VARYING_SLOT_FACE, bool_t, "gl_FrontFacing");
 718    if (state->is_version(120, 100))
 719       add_input(VARYING_SLOT_PNTC, vec2_t, "gl_PointCoord");
 720
 721    if (state->is_version(150, 0)) {
 722       ir_variable *var =
 723          add_input(VARYING_SLOT_PRIMITIVE_ID, int_t, "gl_PrimitiveID");
 724       var->interpolation = INTERP_QUALIFIER_FLAT;
 725    }
 726
 727    /* gl_FragColor and gl_FragData were deprecated starting in desktop GLSL
 728     * 1.30, and were relegated to the compatibility profile in GLSL 4.20.
 729     * They were removed from GLSL ES 3.00.
 730     */
 731    if (compatibility || !state->is_version(420, 300)) {
 732       add_output(FRAG_RESULT_COLOR, vec4_t, "gl_FragColor");
 733       add_output(FRAG_RESULT_DATA0,
 734                  array(vec4_t, state->Const.MaxDrawBuffers), "gl_FragData");
 735    }
 736
 737    /* gl_FragDepth has always been in desktop GLSL, but did not appear in GLSL
 738     * ES 1.00.
 739     */
 740    if (state->is_version(110, 300))
 741       add_output(FRAG_RESULT_DEPTH, float_t, "gl_FragDepth");
 742
 743    if (state->ARB_shader_stencil_export_enable) {
 744       ir_variable *const var =
 745          add_output(FRAG_RESULT_STENCIL, int_t, "gl_FragStencilRefARB");
 746       if (state->ARB_shader_stencil_export_warn)
 747          var->warn_extension = "GL_ARB_shader_stencil_export";
 748    }
 749
 750    if (state->AMD_shader_stencil_export_enable) {
 751       ir_variable *const var =
 752          add_output(FRAG_RESULT_STENCIL, int_t, "gl_FragStencilRefAMD");
 753       if (state->AMD_shader_stencil_export_warn)
 754          var->warn_extension = "GL_AMD_shader_stencil_export";
 755    }
 756 }
 757
 758
 759 /**
 760  * Add a single "varying" variable.  The variable's type and direction (input
 761  * or output) are adjusted as appropriate for the type of shader being
 762  * compiled.  For geometry shaders using {ARB,EXT}_geometry_shader4,
 763  * name_as_gs_input is used for the input (to avoid ambiguity).
 764  */
 765 void
 766 builtin_variable_generator::add_varying(int slot, const glsl_type *type,
 767                                         const char *name,
 768                                         const char *name_as_gs_input)
 769 {
 770    switch (state->target) {
 771    case geometry_shader:
 772       assert(this->num_per_vertex_fields <
 773              ARRAY_SIZE(this->per_vertex_fields));
 774       this->per_vertex_fields[this->num_per_vertex_fields].type = type;
 775       this->per_vertex_fields[this->num_per_vertex_fields].name = name;
 776       this->per_vertex_fields[this->num_per_vertex_fields].row_major = false;
 777       this->per_vertex_fields[this->num_per_vertex_fields].location = slot;
 778       this->num_per_vertex_fields++;
 779       /* FALLTHROUGH */
 780    case vertex_shader:
 781       add_output(slot, type, name);
 782       break;
 783    case fragment_shader:
 784       add_input(slot, type, name);
 785       break;
 786    }
 787 }
 788
 789
 790 /**
 791  * Generate variables that are used to communicate data from one shader stage
 792  * to the next ("varyings").
 793  */
 794 void
 795 builtin_variable_generator::generate_varyings()
 796 {
 797 #define ADD_VARYING(loc, type, name) \
 798    add_varying(loc, type, name, name "In")
 799
 800    /* gl_Position and gl_PointSize are not visible from fragment shaders. */
 801    if (state->target != fragment_shader) {
 802       ADD_VARYING(VARYING_SLOT_POS, vec4_t, "gl_Position");
 803       ADD_VARYING(VARYING_SLOT_PSIZ, float_t, "gl_PointSize");
 804    }
 805
 806    if (state->is_version(130, 0)) {
 807        ADD_VARYING(VARYING_SLOT_CLIP_DIST0, array(float_t, 0),
 808                    "gl_ClipDistance");
 809    }
 810
 811    if (compatibility) {
 812       ADD_VARYING(VARYING_SLOT_TEX0, array(vec4_t, 0), "gl_TexCoord");
 813       ADD_VARYING(VARYING_SLOT_FOGC, float_t, "gl_FogFragCoord");
 814       if (state->target == fragment_shader) {
 815          ADD_VARYING(VARYING_SLOT_COL0, vec4_t, "gl_Color");
 816          ADD_VARYING(VARYING_SLOT_COL1, vec4_t, "gl_SecondaryColor");
 817       } else {
 818          ADD_VARYING(VARYING_SLOT_CLIP_VERTEX, vec4_t, "gl_ClipVertex");
 819          ADD_VARYING(VARYING_SLOT_COL0, vec4_t, "gl_FrontColor");
 820          ADD_VARYING(VARYING_SLOT_BFC0, vec4_t, "gl_BackColor");
 821          ADD_VARYING(VARYING_SLOT_COL1, vec4_t, "gl_FrontSecondaryColor");
 822          ADD_VARYING(VARYING_SLOT_BFC1, vec4_t, "gl_BackSecondaryColor");
 823       }
 824    }
 825
 826    if (state->target == geometry_shader) {
 827       const glsl_type *per_vertex_type =
 828          glsl_type::get_interface_instance(this->per_vertex_fields,
 829                                            this->num_per_vertex_fields,
 830                                            GLSL_INTERFACE_PACKING_STD140,
 831                                            "gl_PerVertex");
 832       ir_variable *var = add_variable("gl_in", array(per_vertex_type, 0),
 833                                       ir_var_shader_in, -1);
 834       var->init_interface_type(per_vertex_type);
 835    }
 836 }
 837
 838
 839 }; /* Anonymous namespace */
 840
 841
 842 void
 843 _mesa_glsl_initialize_variables(exec_list *instructions,
 844                                 struct _mesa_glsl_parse_state *state)
 845 {
 846    builtin_variable_generator gen(instructions, state);
 847
 848    gen.generate_constants();
 849    gen.generate_uniforms();
 850
 851    gen.generate_varyings();
 852
 853    switch (state->target) {
 854    case vertex_shader:
 855       gen.generate_vs_special_vars();
 856       break;
 857    case geometry_shader:
 858       gen.generate_gs_special_vars();
 859       break;
 860    case fragment_shader:
 861       gen.generate_fs_special_vars();
 862       break;
 863    }
 864 }