reactos/dll/opengl/mesa/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 void generate_ARB_draw_buffers_variables(exec_list *,
  34                                                 struct _mesa_glsl_parse_state *,
  35                                                 bool, _mesa_glsl_parser_targets);
  36
  37 static void
  38 generate_ARB_draw_instanced_variables(exec_list *,
  39                                       struct _mesa_glsl_parse_state *,
  40                                       bool, _mesa_glsl_parser_targets);
  41
  42 struct builtin_variable {
  43    enum ir_variable_mode mode;
  44    int slot;
  45    const char *type;
  46    const char *name;
  47 };
  48
  49 static const builtin_variable builtin_core_vs_variables[] = {
  50    { ir_var_out, VERT_RESULT_HPOS, "vec4",  "gl_Position" },
  51    { ir_var_out, VERT_RESULT_PSIZ, "float", "gl_PointSize" },
  52 };
  53
  54 static const builtin_variable builtin_core_fs_variables[] = {
  55    { ir_var_in,  FRAG_ATTRIB_WPOS,  "vec4",  "gl_FragCoord" },
  56    { ir_var_in,  FRAG_ATTRIB_FACE,  "bool",  "gl_FrontFacing" },
  57    { ir_var_out, FRAG_RESULT_COLOR, "vec4",  "gl_FragColor" },
  58 };
  59
  60 static const builtin_variable builtin_100ES_fs_variables[] = {
  61    { ir_var_in,  FRAG_ATTRIB_PNTC,   "vec2",   "gl_PointCoord" },
  62 };
  63
  64 static const builtin_variable builtin_110_fs_variables[] = {
  65    { ir_var_out, FRAG_RESULT_DEPTH, "float", "gl_FragDepth" },
  66 };
  67
  68 static const builtin_variable builtin_110_deprecated_fs_variables[] = {
  69    { ir_var_in,  FRAG_ATTRIB_COL0,  "vec4",  "gl_Color" },
  70    { ir_var_in,  FRAG_ATTRIB_COL1,  "vec4",  "gl_SecondaryColor" },
  71    { ir_var_in,  FRAG_ATTRIB_FOGC,  "float", "gl_FogFragCoord" },
  72 };
  73
  74 static const builtin_variable builtin_110_deprecated_vs_variables[] = {
  75    { ir_var_in,  VERT_ATTRIB_POS,         "vec4",  "gl_Vertex" },
  76    { ir_var_in,  VERT_ATTRIB_NORMAL,      "vec3",  "gl_Normal" },
  77    { ir_var_in,  VERT_ATTRIB_COLOR0,      "vec4",  "gl_Color" },
  78    { ir_var_in,  VERT_ATTRIB_COLOR1,      "vec4",  "gl_SecondaryColor" },
  79    { ir_var_in,  VERT_ATTRIB_TEX0,        "vec4",  "gl_MultiTexCoord0" },
  80    { ir_var_in,  VERT_ATTRIB_TEX1,        "vec4",  "gl_MultiTexCoord1" },
  81    { ir_var_in,  VERT_ATTRIB_TEX2,        "vec4",  "gl_MultiTexCoord2" },
  82    { ir_var_in,  VERT_ATTRIB_TEX3,        "vec4",  "gl_MultiTexCoord3" },
  83    { ir_var_in,  VERT_ATTRIB_TEX4,        "vec4",  "gl_MultiTexCoord4" },
  84    { ir_var_in,  VERT_ATTRIB_TEX5,        "vec4",  "gl_MultiTexCoord5" },
  85    { ir_var_in,  VERT_ATTRIB_TEX6,        "vec4",  "gl_MultiTexCoord6" },
  86    { ir_var_in,  VERT_ATTRIB_TEX7,        "vec4",  "gl_MultiTexCoord7" },
  87    { ir_var_in,  VERT_ATTRIB_FOG,         "float", "gl_FogCoord" },
  88    { ir_var_out, VERT_RESULT_CLIP_VERTEX, "vec4",  "gl_ClipVertex" },
  89    { ir_var_out, VERT_RESULT_COL0,        "vec4",  "gl_FrontColor" },
  90    { ir_var_out, VERT_RESULT_BFC0,        "vec4",  "gl_BackColor" },
  91    { ir_var_out, VERT_RESULT_COL1,        "vec4",  "gl_FrontSecondaryColor" },
  92    { ir_var_out, VERT_RESULT_BFC1,        "vec4",  "gl_BackSecondaryColor" },
  93    { ir_var_out, VERT_RESULT_FOGC,        "float", "gl_FogFragCoord" },
  94 };
  95
  96 static const builtin_variable builtin_120_fs_variables[] = {
  97    { ir_var_in,  FRAG_ATTRIB_PNTC,   "vec2",   "gl_PointCoord" },
  98 };
  99
 100 static const builtin_variable builtin_130_vs_variables[] = {
 101    { ir_var_system_value,  SYSTEM_VALUE_VERTEX_ID, "int",   "gl_VertexID" },
 102 };
 103
 104 static const builtin_variable builtin_110_deprecated_uniforms[] = {
 105    { ir_var_uniform, -1, "mat4", "gl_ModelViewMatrix" },
 106    { ir_var_uniform, -1, "mat4", "gl_ProjectionMatrix" },
 107    { ir_var_uniform, -1, "mat4", "gl_ModelViewProjectionMatrix" },
 108    { ir_var_uniform, -1, "mat3", "gl_NormalMatrix" },
 109    { ir_var_uniform, -1, "mat4", "gl_ModelViewMatrixInverse" },
 110    { ir_var_uniform, -1, "mat4", "gl_ProjectionMatrixInverse" },
 111    { ir_var_uniform, -1, "mat4", "gl_ModelViewProjectionMatrixInverse" },
 112    { ir_var_uniform, -1, "mat4", "gl_ModelViewMatrixTranspose" },
 113    { ir_var_uniform, -1, "mat4", "gl_ProjectionMatrixTranspose" },
 114    { ir_var_uniform, -1, "mat4", "gl_ModelViewProjectionMatrixTranspose" },
 115    { ir_var_uniform, -1, "mat4", "gl_ModelViewMatrixInverseTranspose" },
 116    { ir_var_uniform, -1, "mat4", "gl_ProjectionMatrixInverseTranspose" },
 117    { ir_var_uniform, -1, "mat4", "gl_ModelViewProjectionMatrixInverseTranspose" },
 118    { ir_var_uniform, -1, "float", "gl_NormalScale" },
 119    { ir_var_uniform, -1, "gl_LightModelParameters", "gl_LightModel"},
 120
 121    /* Mesa-internal ATI_envmap_bumpmap state. */
 122    { ir_var_uniform, -1, "vec2", "gl_BumpRotMatrix0MESA"},
 123    { ir_var_uniform, -1, "vec2", "gl_BumpRotMatrix1MESA"},
 124    { ir_var_uniform, -1, "vec4", "gl_FogParamsOptimizedMESA"},
 125 };
 126
 127 static struct gl_builtin_uniform_element gl_DepthRange_elements[] = {
 128    {"near", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_XXXX},
 129    {"far", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_YYYY},
 130    {"diff", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_ZZZZ},
 131 };
 132
 133 static struct gl_builtin_uniform_element gl_ClipPlane_elements[] = {
 134    {NULL, {STATE_CLIPPLANE, 0, 0}, SWIZZLE_XYZW}
 135 };
 136
 137 static struct gl_builtin_uniform_element gl_Point_elements[] = {
 138    {"size", {STATE_POINT_SIZE}, SWIZZLE_XXXX},
 139    {"sizeMin", {STATE_POINT_SIZE}, SWIZZLE_YYYY},
 140    {"sizeMax", {STATE_POINT_SIZE}, SWIZZLE_ZZZZ},
 141    {"fadeThresholdSize", {STATE_POINT_SIZE}, SWIZZLE_WWWW},
 142    {"distanceConstantAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_XXXX},
 143    {"distanceLinearAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_YYYY},
 144    {"distanceQuadraticAttenuation", {STATE_POINT_ATTENUATION}, SWIZZLE_ZZZZ},
 145 };
 146
 147 static struct gl_builtin_uniform_element gl_FrontMaterial_elements[] = {
 148    {"emission", {STATE_MATERIAL, 0, STATE_EMISSION}, SWIZZLE_XYZW},
 149    {"ambient", {STATE_MATERIAL, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
 150    {"diffuse", {STATE_MATERIAL, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
 151    {"specular", {STATE_MATERIAL, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
 152    {"shininess", {STATE_MATERIAL, 0, STATE_SHININESS}, SWIZZLE_XXXX},
 153 };
 154
 155 static struct gl_builtin_uniform_element gl_BackMaterial_elements[] = {
 156    {"emission", {STATE_MATERIAL, 1, STATE_EMISSION}, SWIZZLE_XYZW},
 157    {"ambient", {STATE_MATERIAL, 1, STATE_AMBIENT}, SWIZZLE_XYZW},
 158    {"diffuse", {STATE_MATERIAL, 1, STATE_DIFFUSE}, SWIZZLE_XYZW},
 159    {"specular", {STATE_MATERIAL, 1, STATE_SPECULAR}, SWIZZLE_XYZW},
 160    {"shininess", {STATE_MATERIAL, 1, STATE_SHININESS}, SWIZZLE_XXXX},
 161 };
 162
 163 static struct gl_builtin_uniform_element gl_LightSource_elements[] = {
 164    {"ambient", {STATE_LIGHT, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
 165    {"diffuse", {STATE_LIGHT, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
 166    {"specular", {STATE_LIGHT, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
 167    {"position", {STATE_LIGHT, 0, STATE_POSITION}, SWIZZLE_XYZW},
 168    {"halfVector", {STATE_LIGHT, 0, STATE_HALF_VECTOR}, SWIZZLE_XYZW},
 169    {"spotDirection", {STATE_LIGHT, 0, STATE_SPOT_DIRECTION},
 170     MAKE_SWIZZLE4(SWIZZLE_X,
 171                   SWIZZLE_Y,
 172                   SWIZZLE_Z,
 173                   SWIZZLE_Z)},
 174    {"spotCosCutoff", {STATE_LIGHT, 0, STATE_SPOT_DIRECTION}, SWIZZLE_WWWW},
 175    {"spotCutoff", {STATE_LIGHT, 0, STATE_SPOT_CUTOFF}, SWIZZLE_XXXX},
 176    {"spotExponent", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_WWWW},
 177    {"constantAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_XXXX},
 178    {"linearAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_YYYY},
 179    {"quadraticAttenuation", {STATE_LIGHT, 0, STATE_ATTENUATION}, SWIZZLE_ZZZZ},
 180 };
 181
 182 static struct gl_builtin_uniform_element gl_LightModel_elements[] = {
 183    {"ambient", {STATE_LIGHTMODEL_AMBIENT, 0}, SWIZZLE_XYZW},
 184 };
 185
 186 static struct gl_builtin_uniform_element gl_FrontLightModelProduct_elements[] = {
 187    {"sceneColor", {STATE_LIGHTMODEL_SCENECOLOR, 0}, SWIZZLE_XYZW},
 188 };
 189
 190 static struct gl_builtin_uniform_element gl_BackLightModelProduct_elements[] = {
 191    {"sceneColor", {STATE_LIGHTMODEL_SCENECOLOR, 1}, SWIZZLE_XYZW},
 192 };
 193
 194 static struct gl_builtin_uniform_element gl_FrontLightProduct_elements[] = {
 195    {"ambient", {STATE_LIGHTPROD, 0, 0, STATE_AMBIENT}, SWIZZLE_XYZW},
 196    {"diffuse", {STATE_LIGHTPROD, 0, 0, STATE_DIFFUSE}, SWIZZLE_XYZW},
 197    {"specular", {STATE_LIGHTPROD, 0, 0, STATE_SPECULAR}, SWIZZLE_XYZW},
 198 };
 199
 200 static struct gl_builtin_uniform_element gl_BackLightProduct_elements[] = {
 201    {"ambient", {STATE_LIGHTPROD, 0, 1, STATE_AMBIENT}, SWIZZLE_XYZW},
 202    {"diffuse", {STATE_LIGHTPROD, 0, 1, STATE_DIFFUSE}, SWIZZLE_XYZW},
 203    {"specular", {STATE_LIGHTPROD, 0, 1, STATE_SPECULAR}, SWIZZLE_XYZW},
 204 };
 205
 206 static struct gl_builtin_uniform_element gl_TextureEnvColor_elements[] = {
 207    {NULL, {STATE_TEXENV_COLOR, 0}, SWIZZLE_XYZW},
 208 };
 209
 210 static struct gl_builtin_uniform_element gl_EyePlaneS_elements[] = {
 211    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_S}, SWIZZLE_XYZW},
 212 };
 213
 214 static struct gl_builtin_uniform_element gl_EyePlaneT_elements[] = {
 215    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_T}, SWIZZLE_XYZW},
 216 };
 217
 218 static struct gl_builtin_uniform_element gl_EyePlaneR_elements[] = {
 219    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_R}, SWIZZLE_XYZW},
 220 };
 221
 222 static struct gl_builtin_uniform_element gl_EyePlaneQ_elements[] = {
 223    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_EYE_Q}, SWIZZLE_XYZW},
 224 };
 225
 226 static struct gl_builtin_uniform_element gl_ObjectPlaneS_elements[] = {
 227    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_S}, SWIZZLE_XYZW},
 228 };
 229
 230 static struct gl_builtin_uniform_element gl_ObjectPlaneT_elements[] = {
 231    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_T}, SWIZZLE_XYZW},
 232 };
 233
 234 static struct gl_builtin_uniform_element gl_ObjectPlaneR_elements[] = {
 235    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_R}, SWIZZLE_XYZW},
 236 };
 237
 238 static struct gl_builtin_uniform_element gl_ObjectPlaneQ_elements[] = {
 239    {NULL, {STATE_TEXGEN, 0, STATE_TEXGEN_OBJECT_Q}, SWIZZLE_XYZW},
 240 };
 241
 242 static struct gl_builtin_uniform_element gl_Fog_elements[] = {
 243    {"color", {STATE_FOG_COLOR}, SWIZZLE_XYZW},
 244    {"density", {STATE_FOG_PARAMS}, SWIZZLE_XXXX},
 245    {"start", {STATE_FOG_PARAMS}, SWIZZLE_YYYY},
 246    {"end", {STATE_FOG_PARAMS}, SWIZZLE_ZZZZ},
 247    {"scale", {STATE_FOG_PARAMS}, SWIZZLE_WWWW},
 248 };
 249
 250 static struct gl_builtin_uniform_element gl_NormalScale_elements[] = {
 251    {NULL, {STATE_NORMAL_SCALE}, SWIZZLE_XXXX},
 252 };
 253
 254 static struct gl_builtin_uniform_element gl_BumpRotMatrix0MESA_elements[] = {
 255    {NULL, {STATE_INTERNAL, STATE_ROT_MATRIX_0}, SWIZZLE_XYZW},
 256 };
 257
 258 static struct gl_builtin_uniform_element gl_BumpRotMatrix1MESA_elements[] = {
 259    {NULL, {STATE_INTERNAL, STATE_ROT_MATRIX_1}, SWIZZLE_XYZW},
 260 };
 261
 262 static struct gl_builtin_uniform_element gl_FogParamsOptimizedMESA_elements[] = {
 263    {NULL, {STATE_INTERNAL, STATE_FOG_PARAMS_OPTIMIZED}, SWIZZLE_XYZW},
 264 };
 265
 266 static struct gl_builtin_uniform_element gl_CurrentAttribVertMESA_elements[] = {
 267    {NULL, {STATE_INTERNAL, STATE_CURRENT_ATTRIB, 0}, SWIZZLE_XYZW},
 268 };
 269
 270 static struct gl_builtin_uniform_element gl_CurrentAttribFragMESA_elements[] = {
 271    {NULL, {STATE_INTERNAL, STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED, 0}, SWIZZLE_XYZW},
 272 };
 273
 274 #define MATRIX(name, statevar, modifier)                                \
 275    static struct gl_builtin_uniform_element name ## _elements[] = {     \
 276       { NULL, { statevar, 0, 0, 0, modifier}, SWIZZLE_XYZW },           \
 277       { NULL, { statevar, 0, 1, 1, modifier}, SWIZZLE_XYZW },           \
 278       { NULL, { statevar, 0, 2, 2, modifier}, SWIZZLE_XYZW },           \
 279       { NULL, { statevar, 0, 3, 3, modifier}, SWIZZLE_XYZW },           \
 280    }
 281
 282 MATRIX(gl_ModelViewMatrix,
 283        STATE_MODELVIEW_MATRIX, STATE_MATRIX_TRANSPOSE);
 284 MATRIX(gl_ModelViewMatrixInverse,
 285        STATE_MODELVIEW_MATRIX, STATE_MATRIX_INVTRANS);
 286 MATRIX(gl_ModelViewMatrixTranspose,
 287        STATE_MODELVIEW_MATRIX, 0);
 288 MATRIX(gl_ModelViewMatrixInverseTranspose,
 289        STATE_MODELVIEW_MATRIX, STATE_MATRIX_INVERSE);
 290
 291 MATRIX(gl_ProjectionMatrix,
 292        STATE_PROJECTION_MATRIX, STATE_MATRIX_TRANSPOSE);
 293 MATRIX(gl_ProjectionMatrixInverse,
 294        STATE_PROJECTION_MATRIX, STATE_MATRIX_INVTRANS);
 295 MATRIX(gl_ProjectionMatrixTranspose,
 296        STATE_PROJECTION_MATRIX, 0);
 297 MATRIX(gl_ProjectionMatrixInverseTranspose,
 298        STATE_PROJECTION_MATRIX, STATE_MATRIX_INVERSE);
 299
 300 MATRIX(gl_ModelViewProjectionMatrix,
 301        STATE_MVP_MATRIX, STATE_MATRIX_TRANSPOSE);
 302 MATRIX(gl_ModelViewProjectionMatrixInverse,
 303        STATE_MVP_MATRIX, STATE_MATRIX_INVTRANS);
 304 MATRIX(gl_ModelViewProjectionMatrixTranspose,
 305        STATE_MVP_MATRIX, 0);
 306 MATRIX(gl_ModelViewProjectionMatrixInverseTranspose,
 307        STATE_MVP_MATRIX, STATE_MATRIX_INVERSE);
 308
 309 MATRIX(gl_TextureMatrix,
 310        STATE_TEXTURE_MATRIX, STATE_MATRIX_TRANSPOSE);
 311 MATRIX(gl_TextureMatrixInverse,
 312        STATE_TEXTURE_MATRIX, STATE_MATRIX_INVTRANS);
 313 MATRIX(gl_TextureMatrixTranspose,
 314        STATE_TEXTURE_MATRIX, 0);
 315 MATRIX(gl_TextureMatrixInverseTranspose,
 316        STATE_TEXTURE_MATRIX, STATE_MATRIX_INVERSE);
 317
 318 static struct gl_builtin_uniform_element gl_NormalMatrix_elements[] = {
 319    { NULL, { STATE_MODELVIEW_MATRIX, 0, 0, 0, STATE_MATRIX_INVERSE},
 320      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 321    { NULL, { STATE_MODELVIEW_MATRIX, 0, 1, 1, STATE_MATRIX_INVERSE},
 322      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 323    { NULL, { STATE_MODELVIEW_MATRIX, 0, 2, 2, STATE_MATRIX_INVERSE},
 324      MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z) },
 325 };
 326
 327 #undef MATRIX
 328
 329 #define STATEVAR(name) {#name, name ## _elements, Elements(name ## _elements)}
 330
 331 const struct gl_builtin_uniform_desc _mesa_builtin_uniform_desc[] = {
 332    STATEVAR(gl_DepthRange),
 333    STATEVAR(gl_ClipPlane),
 334    STATEVAR(gl_Point),
 335    STATEVAR(gl_FrontMaterial),
 336    STATEVAR(gl_BackMaterial),
 337    STATEVAR(gl_LightSource),
 338    STATEVAR(gl_LightModel),
 339    STATEVAR(gl_FrontLightModelProduct),
 340    STATEVAR(gl_BackLightModelProduct),
 341    STATEVAR(gl_FrontLightProduct),
 342    STATEVAR(gl_BackLightProduct),
 343    STATEVAR(gl_TextureEnvColor),
 344    STATEVAR(gl_EyePlaneS),
 345    STATEVAR(gl_EyePlaneT),
 346    STATEVAR(gl_EyePlaneR),
 347    STATEVAR(gl_EyePlaneQ),
 348    STATEVAR(gl_ObjectPlaneS),
 349    STATEVAR(gl_ObjectPlaneT),
 350    STATEVAR(gl_ObjectPlaneR),
 351    STATEVAR(gl_ObjectPlaneQ),
 352    STATEVAR(gl_Fog),
 353
 354    STATEVAR(gl_ModelViewMatrix),
 355    STATEVAR(gl_ModelViewMatrixInverse),
 356    STATEVAR(gl_ModelViewMatrixTranspose),
 357    STATEVAR(gl_ModelViewMatrixInverseTranspose),
 358
 359    STATEVAR(gl_ProjectionMatrix),
 360    STATEVAR(gl_ProjectionMatrixInverse),
 361    STATEVAR(gl_ProjectionMatrixTranspose),
 362    STATEVAR(gl_ProjectionMatrixInverseTranspose),
 363
 364    STATEVAR(gl_ModelViewProjectionMatrix),
 365    STATEVAR(gl_ModelViewProjectionMatrixInverse),
 366    STATEVAR(gl_ModelViewProjectionMatrixTranspose),
 367    STATEVAR(gl_ModelViewProjectionMatrixInverseTranspose),
 368
 369    STATEVAR(gl_TextureMatrix),
 370    STATEVAR(gl_TextureMatrixInverse),
 371    STATEVAR(gl_TextureMatrixTranspose),
 372    STATEVAR(gl_TextureMatrixInverseTranspose),
 373
 374    STATEVAR(gl_NormalMatrix),
 375    STATEVAR(gl_NormalScale),
 376
 377    STATEVAR(gl_BumpRotMatrix0MESA),
 378    STATEVAR(gl_BumpRotMatrix1MESA),
 379    STATEVAR(gl_FogParamsOptimizedMESA),
 380    STATEVAR(gl_CurrentAttribVertMESA),
 381    STATEVAR(gl_CurrentAttribFragMESA),
 382
 383    {NULL, NULL, 0}
 384 };
 385
 386 static ir_variable *
 387 add_variable(exec_list *instructions, glsl_symbol_table *symtab,
 388              const char *name, const glsl_type *type,
 389              enum ir_variable_mode mode, int slot)
 390 {
 391    ir_variable *var = new(symtab) ir_variable(type, name, mode);
 392
 393    switch (var->mode) {
 394    case ir_var_auto:
 395    case ir_var_in:
 396    case ir_var_const_in:
 397    case ir_var_uniform:
 398    case ir_var_system_value:
 399       var->read_only = true;
 400       break;
 401    case ir_var_inout:
 402    case ir_var_out:
 403       break;
 404    default:
 405       assert(0);
 406       break;
 407    }
 408
 409    var->location = slot;
 410
 411    /* Once the variable is created an initialized, add it to the symbol table
 412     * and add the declaration to the IR stream.
 413     */
 414    instructions->push_tail(var);
 415
 416    symtab->add_variable(var);
 417    return var;
 418 }
 419
 420 static ir_variable *
 421 add_uniform(exec_list *instructions, glsl_symbol_table *symtab,
 422             const char *name, const glsl_type *type)
 423 {
 424    ir_variable *const uni =
 425       add_variable(instructions, symtab, name, type, ir_var_uniform, -1);
 426
 427    unsigned i;
 428    for (i = 0; _mesa_builtin_uniform_desc[i].name != NULL; i++) {
 429       if (strcmp(_mesa_builtin_uniform_desc[i].name, name) == 0) {
 430          break;
 431       }
 432    }
 433
 434    assert(_mesa_builtin_uniform_desc[i].name != NULL);
 435    const struct gl_builtin_uniform_desc* const statevar =
 436       &_mesa_builtin_uniform_desc[i];
 437
 438    const unsigned array_count = type->is_array() ? type->length : 1;
 439    uni->num_state_slots = array_count * statevar->num_elements;
 440
 441    ir_state_slot *slots =
 442       ralloc_array(uni, ir_state_slot, uni->num_state_slots);
 443
 444    uni->state_slots = slots;
 445
 446    for (unsigned a = 0; a < array_count; a++) {
 447       for (unsigned j = 0; j < statevar->num_elements; j++) {
 448          struct gl_builtin_uniform_element *element = &statevar->elements[j];
 449
 450          memcpy(slots->tokens, element->tokens, sizeof(element->tokens));
 451          if (type->is_array()) {
 452             if (strcmp(name, "gl_CurrentAttribVertMESA") == 0 ||
 453                 strcmp(name, "gl_CurrentAttribFragMESA") == 0) {
 454                slots->tokens[2] = a;
 455             } else {
 456                slots->tokens[1] = a;
 457             }
 458          }
 459
 460          slots->swizzle = element->swizzle;
 461          slots++;
 462       }
 463    }
 464
 465    return uni;
 466 }
 467
 468 static void
 469 add_builtin_variable(exec_list *instructions, glsl_symbol_table *symtab,
 470                      const builtin_variable *proto)
 471 {
 472    /* Create a new variable declaration from the description supplied by
 473     * the caller.
 474     */
 475    const glsl_type *const type = symtab->get_type(proto->type);
 476
 477    assert(type != NULL);
 478
 479    if (proto->mode == ir_var_uniform) {
 480       add_uniform(instructions, symtab, proto->name, type);
 481    } else {
 482       add_variable(instructions, symtab, proto->name, type, proto->mode,
 483                    proto->slot);
 484    }
 485 }
 486
 487 static ir_variable *
 488 add_builtin_constant(exec_list *instructions, glsl_symbol_table *symtab,
 489                      const char *name, int value)
 490 {
 491    ir_variable *const var = add_variable(instructions, symtab,
 492                                          name, glsl_type::int_type,
 493                                          ir_var_auto, -1);
 494    var->constant_value = new(var) ir_constant(value);
 495    var->constant_initializer = new(var) ir_constant(value);
 496    var->has_initializer = true;
 497    return var;
 498 }
 499
 500 /* Several constants in GLSL ES have different names than normal desktop GLSL.
 501  * Therefore, this function should only be called on the ES path.
 502  */
 503 static void
 504 generate_100ES_uniforms(exec_list *instructions,
 505                      struct _mesa_glsl_parse_state *state)
 506 {
 507    glsl_symbol_table *const symtab = state->symbols;
 508
 509    add_builtin_constant(instructions, symtab, "gl_MaxVertexAttribs",
 510                         state->Const.MaxVertexAttribs);
 511    add_builtin_constant(instructions, symtab, "gl_MaxVertexUniformVectors",
 512                         state->Const.MaxVertexUniformComponents);
 513    add_builtin_constant(instructions, symtab, "gl_MaxVaryingVectors",
 514                         state->Const.MaxVaryingFloats / 4);
 515    add_builtin_constant(instructions, symtab, "gl_MaxVertexTextureImageUnits",
 516                         state->Const.MaxVertexTextureImageUnits);
 517    add_builtin_constant(instructions, symtab, "gl_MaxCombinedTextureImageUnits",
 518                         state->Const.MaxCombinedTextureImageUnits);
 519    add_builtin_constant(instructions, symtab, "gl_MaxTextureImageUnits",
 520                         state->Const.MaxTextureImageUnits);
 521    add_builtin_constant(instructions, symtab, "gl_MaxFragmentUniformVectors",
 522                         state->Const.MaxFragmentUniformComponents);
 523
 524    add_uniform(instructions, symtab, "gl_DepthRange",
 525                state->symbols->get_type("gl_DepthRangeParameters"));
 526 }
 527
 528 static void
 529 generate_110_uniforms(exec_list *instructions,
 530                       struct _mesa_glsl_parse_state *state)
 531 {
 532    glsl_symbol_table *const symtab = state->symbols;
 533
 534    for (unsigned i = 0
 535            ; i < Elements(builtin_110_deprecated_uniforms)
 536            ; i++) {
 537       add_builtin_variable(instructions, symtab,
 538                            & builtin_110_deprecated_uniforms[i]);
 539    }
 540
 541    add_builtin_constant(instructions, symtab, "gl_MaxLights",
 542                         state->Const.MaxLights);
 543    add_builtin_constant(instructions, symtab, "gl_MaxClipPlanes",
 544                         state->Const.MaxClipPlanes);
 545    add_builtin_constant(instructions, symtab, "gl_MaxTextureUnits",
 546                         state->Const.MaxTextureUnits);
 547    add_builtin_constant(instructions, symtab, "gl_MaxTextureCoords",
 548                         state->Const.MaxTextureCoords);
 549    add_builtin_constant(instructions, symtab, "gl_MaxVertexAttribs",
 550                         state->Const.MaxVertexAttribs);
 551    add_builtin_constant(instructions, symtab, "gl_MaxVertexUniformComponents",
 552                         state->Const.MaxVertexUniformComponents);
 553    add_builtin_constant(instructions, symtab, "gl_MaxVaryingFloats",
 554                         state->Const.MaxVaryingFloats);
 555    add_builtin_constant(instructions, symtab, "gl_MaxVertexTextureImageUnits",
 556                         state->Const.MaxVertexTextureImageUnits);
 557    add_builtin_constant(instructions, symtab, "gl_MaxCombinedTextureImageUnits",
 558                         state->Const.MaxCombinedTextureImageUnits);
 559    add_builtin_constant(instructions, symtab, "gl_MaxTextureImageUnits",
 560                         state->Const.MaxTextureImageUnits);
 561    add_builtin_constant(instructions, symtab, "gl_MaxFragmentUniformComponents",
 562                         state->Const.MaxFragmentUniformComponents);
 563
 564    const glsl_type *const mat4_array_type =
 565       glsl_type::get_array_instance(glsl_type::mat4_type,
 566                                     state->Const.MaxTextureCoords);
 567
 568    add_uniform(instructions, symtab, "gl_TextureMatrix", mat4_array_type);
 569    add_uniform(instructions, symtab, "gl_TextureMatrixInverse", mat4_array_type);
 570    add_uniform(instructions, symtab, "gl_TextureMatrixTranspose", mat4_array_type);
 571    add_uniform(instructions, symtab, "gl_TextureMatrixInverseTranspose", mat4_array_type);
 572
 573    add_uniform(instructions, symtab, "gl_DepthRange",
 574                 symtab->get_type("gl_DepthRangeParameters"));
 575
 576    add_uniform(instructions, symtab, "gl_ClipPlane",
 577                glsl_type::get_array_instance(glsl_type::vec4_type,
 578                                              state->Const.MaxClipPlanes));
 579    add_uniform(instructions, symtab, "gl_Point",
 580                symtab->get_type("gl_PointParameters"));
 581
 582    const glsl_type *const material_parameters_type =
 583       symtab->get_type("gl_MaterialParameters");
 584    add_uniform(instructions, symtab, "gl_FrontMaterial", material_parameters_type);
 585    add_uniform(instructions, symtab, "gl_BackMaterial", material_parameters_type);
 586
 587    const glsl_type *const light_source_array_type =
 588       glsl_type::get_array_instance(symtab->get_type("gl_LightSourceParameters"), state->Const.MaxLights);
 589
 590    add_uniform(instructions, symtab, "gl_LightSource", light_source_array_type);
 591
 592    const glsl_type *const light_model_products_type =
 593       symtab->get_type("gl_LightModelProducts");
 594    add_uniform(instructions, symtab, "gl_FrontLightModelProduct",
 595                light_model_products_type);
 596    add_uniform(instructions, symtab, "gl_BackLightModelProduct",
 597                light_model_products_type);
 598
 599    const glsl_type *const light_products_type =
 600       glsl_type::get_array_instance(symtab->get_type("gl_LightProducts"),
 601                                     state->Const.MaxLights);
 602    add_uniform(instructions, symtab, "gl_FrontLightProduct", light_products_type);
 603    add_uniform(instructions, symtab, "gl_BackLightProduct", light_products_type);
 604
 605    add_uniform(instructions, symtab, "gl_TextureEnvColor",
 606                glsl_type::get_array_instance(glsl_type::vec4_type,
 607                                              state->Const.MaxTextureUnits));
 608
 609    const glsl_type *const texcoords_vec4 =
 610       glsl_type::get_array_instance(glsl_type::vec4_type,
 611                                     state->Const.MaxTextureCoords);
 612    add_uniform(instructions, symtab, "gl_EyePlaneS", texcoords_vec4);
 613    add_uniform(instructions, symtab, "gl_EyePlaneT", texcoords_vec4);
 614    add_uniform(instructions, symtab, "gl_EyePlaneR", texcoords_vec4);
 615    add_uniform(instructions, symtab, "gl_EyePlaneQ", texcoords_vec4);
 616    add_uniform(instructions, symtab, "gl_ObjectPlaneS", texcoords_vec4);
 617    add_uniform(instructions, symtab, "gl_ObjectPlaneT", texcoords_vec4);
 618    add_uniform(instructions, symtab, "gl_ObjectPlaneR", texcoords_vec4);
 619    add_uniform(instructions, symtab, "gl_ObjectPlaneQ", texcoords_vec4);
 620
 621    add_uniform(instructions, symtab, "gl_Fog",
 622                symtab->get_type("gl_FogParameters"));
 623
 624    /* Mesa-internal current attrib state */
 625    const glsl_type *const vert_attribs =
 626       glsl_type::get_array_instance(glsl_type::vec4_type, VERT_ATTRIB_MAX);
 627    add_uniform(instructions, symtab, "gl_CurrentAttribVertMESA", vert_attribs);
 628    const glsl_type *const frag_attribs =
 629       glsl_type::get_array_instance(glsl_type::vec4_type, FRAG_ATTRIB_MAX);
 630    add_uniform(instructions, symtab, "gl_CurrentAttribFragMESA", frag_attribs);
 631 }
 632
 633 /* This function should only be called for ES, not desktop GL. */
 634 static void
 635 generate_100ES_vs_variables(exec_list *instructions,
 636                           struct _mesa_glsl_parse_state *state)
 637 {
 638    for (unsigned i = 0; i < Elements(builtin_core_vs_variables); i++) {
 639       add_builtin_variable(instructions, state->symbols,
 640                            & builtin_core_vs_variables[i]);
 641    }
 642
 643    generate_100ES_uniforms(instructions, state);
 644
 645    generate_ARB_draw_buffers_variables(instructions, state, false,
 646                                        vertex_shader);
 647 }
 648
 649
 650 static void
 651 generate_110_vs_variables(exec_list *instructions,
 652                           struct _mesa_glsl_parse_state *state)
 653 {
 654    for (unsigned i = 0; i < Elements(builtin_core_vs_variables); i++) {
 655       add_builtin_variable(instructions, state->symbols,
 656                            & builtin_core_vs_variables[i]);
 657    }
 658
 659    for (unsigned i = 0
 660            ; i < Elements(builtin_110_deprecated_vs_variables)
 661            ; i++) {
 662       add_builtin_variable(instructions, state->symbols,
 663                            & builtin_110_deprecated_vs_variables[i]);
 664    }
 665    generate_110_uniforms(instructions, state);
 666
 667    /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
 668     *
 669     *     "As with all arrays, indices used to subscript gl_TexCoord must
 670     *     either be an integral constant expressions, or this array must be
 671     *     re-declared by the shader with a size. The size can be at most
 672     *     gl_MaxTextureCoords. Using indexes close to 0 may aid the
 673     *     implementation in preserving varying resources."
 674     */
 675    const glsl_type *const vec4_array_type =
 676       glsl_type::get_array_instance(glsl_type::vec4_type, 0);
 677
 678    add_variable(instructions, state->symbols,
 679                 "gl_TexCoord", vec4_array_type, ir_var_out, VERT_RESULT_TEX0);
 680
 681    generate_ARB_draw_buffers_variables(instructions, state, false,
 682                                        vertex_shader);
 683 }
 684
 685
 686 static void
 687 generate_120_vs_variables(exec_list *instructions,
 688                           struct _mesa_glsl_parse_state *state)
 689 {
 690    /* GLSL version 1.20 did not add any built-in variables in the vertex
 691     * shader.
 692     */
 693    generate_110_vs_variables(instructions, state);
 694 }
 695
 696
 697 static void
 698 generate_130_uniforms(exec_list *instructions,
 699                       struct _mesa_glsl_parse_state *state)
 700 {
 701    glsl_symbol_table *const symtab = state->symbols;
 702
 703    add_builtin_constant(instructions, symtab, "gl_MaxClipDistances",
 704                         state->Const.MaxClipPlanes);
 705    add_builtin_constant(instructions, symtab, "gl_MaxVaryingComponents",
 706                         state->Const.MaxVaryingFloats);
 707 }
 708
 709
 710 static void
 711 generate_130_vs_variables(exec_list *instructions,
 712                           struct _mesa_glsl_parse_state *state)
 713 {
 714    generate_120_vs_variables(instructions, state);
 715
 716    for (unsigned i = 0; i < Elements(builtin_130_vs_variables); i++) {
 717       add_builtin_variable(instructions, state->symbols,
 718                            & builtin_130_vs_variables[i]);
 719    }
 720
 721    generate_130_uniforms(instructions, state);
 722
 723    /* From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special
 724     * Variables):
 725     *
 726     *   The gl_ClipDistance array is predeclared as unsized and must
 727     *   be sized by the shader either redeclaring it with a size or
 728     *   indexing it only with integral constant expressions.
 729     *
 730     * We represent this in Mesa by initially declaring the array as
 731     * size 0.
 732     */
 733    const glsl_type *const clip_distance_array_type =
 734       glsl_type::get_array_instance(glsl_type::float_type, 0);
 735
 736    add_variable(instructions, state->symbols,
 737                 "gl_ClipDistance", clip_distance_array_type, ir_var_out,
 738                 VERT_RESULT_CLIP_DIST0);
 739
 740 }
 741
 742
 743 static void
 744 initialize_vs_variables(exec_list *instructions,
 745                         struct _mesa_glsl_parse_state *state)
 746 {
 747
 748    switch (state->language_version) {
 749    case 100:
 750       generate_100ES_vs_variables(instructions, state);
 751       break;
 752    case 110:
 753       generate_110_vs_variables(instructions, state);
 754       break;
 755    case 120:
 756       generate_120_vs_variables(instructions, state);
 757       break;
 758    case 130:
 759       generate_130_vs_variables(instructions, state);
 760       break;
 761    }
 762
 763    if (state->ARB_draw_instanced_enable)
 764       generate_ARB_draw_instanced_variables(instructions, state, false,
 765                                             vertex_shader);
 766 }
 767
 768
 769 /* This function should only be called for ES, not desktop GL. */
 770 static void
 771 generate_100ES_fs_variables(exec_list *instructions,
 772                           struct _mesa_glsl_parse_state *state)
 773 {
 774    for (unsigned i = 0; i < Elements(builtin_core_fs_variables); i++) {
 775       add_builtin_variable(instructions, state->symbols,
 776                            & builtin_core_fs_variables[i]);
 777    }
 778
 779    for (unsigned i = 0; i < Elements(builtin_100ES_fs_variables); i++) {
 780       add_builtin_variable(instructions, state->symbols,
 781                            & builtin_100ES_fs_variables[i]);
 782    }
 783
 784    generate_100ES_uniforms(instructions, state);
 785
 786    generate_ARB_draw_buffers_variables(instructions, state, false,
 787                                        fragment_shader);
 788 }
 789
 790 static void
 791 generate_110_fs_variables(exec_list *instructions,
 792                           struct _mesa_glsl_parse_state *state)
 793 {
 794    for (unsigned i = 0; i < Elements(builtin_core_fs_variables); i++) {
 795       add_builtin_variable(instructions, state->symbols,
 796                            & builtin_core_fs_variables[i]);
 797    }
 798
 799    for (unsigned i = 0; i < Elements(builtin_110_fs_variables); i++) {
 800       add_builtin_variable(instructions, state->symbols,
 801                            & builtin_110_fs_variables[i]);
 802    }
 803
 804    for (unsigned i = 0
 805            ; i < Elements(builtin_110_deprecated_fs_variables)
 806            ; i++) {
 807       add_builtin_variable(instructions, state->symbols,
 808                            & builtin_110_deprecated_fs_variables[i]);
 809    }
 810    generate_110_uniforms(instructions, state);
 811
 812    /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
 813     *
 814     *     "As with all arrays, indices used to subscript gl_TexCoord must
 815     *     either be an integral constant expressions, or this array must be
 816     *     re-declared by the shader with a size. The size can be at most
 817     *     gl_MaxTextureCoords. Using indexes close to 0 may aid the
 818     *     implementation in preserving varying resources."
 819     */
 820    const glsl_type *const vec4_array_type =
 821       glsl_type::get_array_instance(glsl_type::vec4_type, 0);
 822
 823    add_variable(instructions, state->symbols,
 824                 "gl_TexCoord", vec4_array_type, ir_var_in, FRAG_ATTRIB_TEX0);
 825
 826    generate_ARB_draw_buffers_variables(instructions, state, false,
 827                                        fragment_shader);
 828 }
 829
 830
 831 static void
 832 generate_ARB_draw_buffers_variables(exec_list *instructions,
 833                                     struct _mesa_glsl_parse_state *state,
 834                                     bool warn, _mesa_glsl_parser_targets target)
 835 {
 836    /* gl_MaxDrawBuffers is available in all shader stages.
 837     */
 838    ir_variable *const mdb =
 839       add_builtin_constant(instructions, state->symbols, "gl_MaxDrawBuffers",
 840                            state->Const.MaxDrawBuffers);
 841
 842    if (warn)
 843       mdb->warn_extension = "GL_ARB_draw_buffers";
 844
 845    /* gl_FragData is only available in the fragment shader.
 846     */
 847    if (target == fragment_shader) {
 848       const glsl_type *const vec4_array_type =
 849          glsl_type::get_array_instance(glsl_type::vec4_type,
 850                                        state->Const.MaxDrawBuffers);
 851
 852       ir_variable *const fd =
 853          add_variable(instructions, state->symbols,
 854                       "gl_FragData", vec4_array_type,
 855                       ir_var_out, FRAG_RESULT_DATA0);
 856
 857       if (warn)
 858          fd->warn_extension = "GL_ARB_draw_buffers";
 859    }
 860 }
 861
 862
 863 static void
 864 generate_ARB_draw_instanced_variables(exec_list *instructions,
 865                                       struct _mesa_glsl_parse_state *state,
 866                                       bool warn,
 867                                       _mesa_glsl_parser_targets target)
 868 {
 869    /* gl_InstanceIDARB is only available in the vertex shader.
 870     */
 871    if (target == vertex_shader) {
 872       ir_variable *const inst =
 873          add_variable(instructions, state->symbols,
 874                       "gl_InstanceIDARB", glsl_type::int_type,
 875                       ir_var_system_value, SYSTEM_VALUE_INSTANCE_ID);
 876
 877       if (warn)
 878          inst->warn_extension = "GL_ARB_draw_instanced";
 879    }
 880 }
 881
 882
 883 static void
 884 generate_ARB_shader_stencil_export_variables(exec_list *instructions,
 885                                              struct _mesa_glsl_parse_state *state,
 886                                              bool warn)
 887 {
 888    /* gl_FragStencilRefARB is only available in the fragment shader.
 889     */
 890    ir_variable *const fd =
 891       add_variable(instructions, state->symbols,
 892                    "gl_FragStencilRefARB", glsl_type::int_type,
 893                    ir_var_out, FRAG_RESULT_STENCIL);
 894
 895    if (warn)
 896       fd->warn_extension = "GL_ARB_shader_stencil_export";
 897 }
 898
 899 static void
 900 generate_AMD_shader_stencil_export_variables(exec_list *instructions,
 901                                              struct _mesa_glsl_parse_state *state,
 902                                              bool warn)
 903 {
 904    /* gl_FragStencilRefAMD is only available in the fragment shader.
 905     */
 906    ir_variable *const fd =
 907       add_variable(instructions, state->symbols,
 908                    "gl_FragStencilRefAMD", glsl_type::int_type,
 909                    ir_var_out, FRAG_RESULT_STENCIL);
 910
 911    if (warn)
 912       fd->warn_extension = "GL_AMD_shader_stencil_export";
 913 }
 914
 915 static void
 916 generate_120_fs_variables(exec_list *instructions,
 917                           struct _mesa_glsl_parse_state *state)
 918 {
 919    generate_110_fs_variables(instructions, state);
 920
 921    for (unsigned i = 0
 922            ; i < Elements(builtin_120_fs_variables)
 923            ; i++) {
 924       add_builtin_variable(instructions, state->symbols,
 925                            & builtin_120_fs_variables[i]);
 926    }
 927 }
 928
 929 static void
 930 generate_130_fs_variables(exec_list *instructions,
 931                           struct _mesa_glsl_parse_state *state)
 932 {
 933    generate_120_fs_variables(instructions, state);
 934
 935    generate_130_uniforms(instructions, state);
 936
 937    /* From the GLSL 1.30 spec, section 7.2 (Fragment Shader Special
 938     * Variables):
 939     *
 940     *   The built-in input variable gl_ClipDistance array contains linearly
 941     *   interpolated values for the vertex values written by the vertex shader
 942     *   to the gl_ClipDistance vertex output variable. This array must be
 943     *   sized in the fragment shader either implicitly or explicitly to be the
 944     *   same size as it was sized in the vertex shader.
 945     *
 946     * In other words, the array must be pre-declared as implicitly sized.  We
 947     * represent this in Mesa by initially declaring the array as size 0.
 948     */
 949    const glsl_type *const clip_distance_array_type =
 950       glsl_type::get_array_instance(glsl_type::float_type, 0);
 951
 952    add_variable(instructions, state->symbols,
 953                 "gl_ClipDistance", clip_distance_array_type, ir_var_in,
 954                 FRAG_ATTRIB_CLIP_DIST0);
 955 }
 956
 957 static void
 958 initialize_fs_variables(exec_list *instructions,
 959                         struct _mesa_glsl_parse_state *state)
 960 {
 961
 962    switch (state->language_version) {
 963    case 100:
 964       generate_100ES_fs_variables(instructions, state);
 965       break;
 966    case 110:
 967       generate_110_fs_variables(instructions, state);
 968       break;
 969    case 120:
 970       generate_120_fs_variables(instructions, state);
 971       break;
 972    case 130:
 973       generate_130_fs_variables(instructions, state);
 974       break;
 975    }
 976
 977    if (state->ARB_shader_stencil_export_enable)
 978       generate_ARB_shader_stencil_export_variables(instructions, state,
 979                                                    state->ARB_shader_stencil_export_warn);
 980
 981    if (state->AMD_shader_stencil_export_enable)
 982       generate_AMD_shader_stencil_export_variables(instructions, state,
 983                                                    state->AMD_shader_stencil_export_warn);
 984 }
 985
 986 void
 987 _mesa_glsl_initialize_variables(exec_list *instructions,
 988                                 struct _mesa_glsl_parse_state *state)
 989 {
 990    switch (state->target) {
 991    case vertex_shader:
 992       initialize_vs_variables(instructions, state);
 993       break;
 994    case fragment_shader:
 995       initialize_fs_variables(instructions, state);
 996       break;
 997    }
 998 }