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    var->explicit_location = (slot >= 0);
 411
 412    /* Once the variable is created an initialized, add it to the symbol table
 413     * and add the declaration to the IR stream.
 414     */
 415    instructions->push_tail(var);
 416
 417    symtab->add_variable(var);
 418    return var;
 419 }
 420
 421 static ir_variable *
 422 add_uniform(exec_list *instructions, glsl_symbol_table *symtab,
 423             const char *name, const glsl_type *type)
 424 {
 425    ir_variable *const uni =
 426       add_variable(instructions, symtab, name, type, ir_var_uniform, -1);
 427
 428    unsigned i;
 429    for (i = 0; _mesa_builtin_uniform_desc[i].name != NULL; i++) {
 430       if (strcmp(_mesa_builtin_uniform_desc[i].name, name) == 0) {
 431          break;
 432       }
 433    }
 434
 435    assert(_mesa_builtin_uniform_desc[i].name != NULL);
 436    const struct gl_builtin_uniform_desc* const statevar =
 437       &_mesa_builtin_uniform_desc[i];
 438
 439    const unsigned array_count = type->is_array() ? type->length : 1;
 440    uni->num_state_slots = array_count * statevar->num_elements;
 441
 442    ir_state_slot *slots =
 443       ralloc_array(uni, ir_state_slot, uni->num_state_slots);
 444
 445    uni->state_slots = slots;
 446
 447    for (unsigned a = 0; a < array_count; a++) {
 448       for (unsigned j = 0; j < statevar->num_elements; j++) {
 449          struct gl_builtin_uniform_element *element = &statevar->elements[j];
 450
 451          memcpy(slots->tokens, element->tokens, sizeof(element->tokens));
 452          if (type->is_array()) {
 453             if (strcmp(name, "gl_CurrentAttribVertMESA") == 0 ||
 454                 strcmp(name, "gl_CurrentAttribFragMESA") == 0) {
 455                slots->tokens[2] = a;
 456             } else {
 457                slots->tokens[1] = a;
 458             }
 459          }
 460
 461          slots->swizzle = element->swizzle;
 462          slots++;
 463       }
 464    }
 465
 466    return uni;
 467 }
 468
 469 static void
 470 add_builtin_variable(exec_list *instructions, glsl_symbol_table *symtab,
 471                      const builtin_variable *proto)
 472 {
 473    /* Create a new variable declaration from the description supplied by
 474     * the caller.
 475     */
 476    const glsl_type *const type = symtab->get_type(proto->type);
 477
 478    assert(type != NULL);
 479
 480    if (proto->mode == ir_var_uniform) {
 481       add_uniform(instructions, symtab, proto->name, type);
 482    } else {
 483       add_variable(instructions, symtab, proto->name, type, proto->mode,
 484                    proto->slot);
 485    }
 486 }
 487
 488 static ir_variable *
 489 add_builtin_constant(exec_list *instructions, glsl_symbol_table *symtab,
 490                      const char *name, int value)
 491 {
 492    ir_variable *const var = add_variable(instructions, symtab,
 493                                          name, glsl_type::int_type,
 494                                          ir_var_auto, -1);
 495    var->constant_value = new(var) ir_constant(value);
 496    var->constant_initializer = new(var) ir_constant(value);
 497    var->has_initializer = true;
 498    return var;
 499 }
 500
 501 /* Several constants in GLSL ES have different names than normal desktop GLSL.
 502  * Therefore, this function should only be called on the ES path.
 503  */
 504 static void
 505 generate_100ES_uniforms(exec_list *instructions,
 506                      struct _mesa_glsl_parse_state *state)
 507 {
 508    glsl_symbol_table *const symtab = state->symbols;
 509
 510    add_builtin_constant(instructions, symtab, "gl_MaxVertexAttribs",
 511                         state->Const.MaxVertexAttribs);
 512    add_builtin_constant(instructions, symtab, "gl_MaxVertexUniformVectors",
 513                         state->Const.MaxVertexUniformComponents);
 514    add_builtin_constant(instructions, symtab, "gl_MaxVaryingVectors",
 515                         state->Const.MaxVaryingFloats / 4);
 516    add_builtin_constant(instructions, symtab, "gl_MaxVertexTextureImageUnits",
 517                         state->Const.MaxVertexTextureImageUnits);
 518    add_builtin_constant(instructions, symtab, "gl_MaxCombinedTextureImageUnits",
 519                         state->Const.MaxCombinedTextureImageUnits);
 520    add_builtin_constant(instructions, symtab, "gl_MaxTextureImageUnits",
 521                         state->Const.MaxTextureImageUnits);
 522    add_builtin_constant(instructions, symtab, "gl_MaxFragmentUniformVectors",
 523                         state->Const.MaxFragmentUniformComponents);
 524
 525    add_uniform(instructions, symtab, "gl_DepthRange",
 526                state->symbols->get_type("gl_DepthRangeParameters"));
 527 }
 528
 529 static void
 530 generate_110_uniforms(exec_list *instructions,
 531                       struct _mesa_glsl_parse_state *state)
 532 {
 533    glsl_symbol_table *const symtab = state->symbols;
 534
 535    for (unsigned i = 0
 536            ; i < Elements(builtin_110_deprecated_uniforms)
 537            ; i++) {
 538       add_builtin_variable(instructions, symtab,
 539                            & builtin_110_deprecated_uniforms[i]);
 540    }
 541
 542    add_builtin_constant(instructions, symtab, "gl_MaxLights",
 543                         state->Const.MaxLights);
 544    add_builtin_constant(instructions, symtab, "gl_MaxClipPlanes",
 545                         state->Const.MaxClipPlanes);
 546    add_builtin_constant(instructions, symtab, "gl_MaxTextureUnits",
 547                         state->Const.MaxTextureUnits);
 548    add_builtin_constant(instructions, symtab, "gl_MaxTextureCoords",
 549                         state->Const.MaxTextureCoords);
 550    add_builtin_constant(instructions, symtab, "gl_MaxVertexAttribs",
 551                         state->Const.MaxVertexAttribs);
 552    add_builtin_constant(instructions, symtab, "gl_MaxVertexUniformComponents",
 553                         state->Const.MaxVertexUniformComponents);
 554    add_builtin_constant(instructions, symtab, "gl_MaxVaryingFloats",
 555                         state->Const.MaxVaryingFloats);
 556    add_builtin_constant(instructions, symtab, "gl_MaxVertexTextureImageUnits",
 557                         state->Const.MaxVertexTextureImageUnits);
 558    add_builtin_constant(instructions, symtab, "gl_MaxCombinedTextureImageUnits",
 559                         state->Const.MaxCombinedTextureImageUnits);
 560    add_builtin_constant(instructions, symtab, "gl_MaxTextureImageUnits",
 561                         state->Const.MaxTextureImageUnits);
 562    add_builtin_constant(instructions, symtab, "gl_MaxFragmentUniformComponents",
 563                         state->Const.MaxFragmentUniformComponents);
 564
 565    const glsl_type *const mat4_array_type =
 566       glsl_type::get_array_instance(glsl_type::mat4_type,
 567                                     state->Const.MaxTextureCoords);
 568
 569    add_uniform(instructions, symtab, "gl_TextureMatrix", mat4_array_type);
 570    add_uniform(instructions, symtab, "gl_TextureMatrixInverse", mat4_array_type);
 571    add_uniform(instructions, symtab, "gl_TextureMatrixTranspose", mat4_array_type);
 572    add_uniform(instructions, symtab, "gl_TextureMatrixInverseTranspose", mat4_array_type);
 573
 574    add_uniform(instructions, symtab, "gl_DepthRange",
 575                 symtab->get_type("gl_DepthRangeParameters"));
 576
 577    add_uniform(instructions, symtab, "gl_ClipPlane",
 578                glsl_type::get_array_instance(glsl_type::vec4_type,
 579                                              state->Const.MaxClipPlanes));
 580    add_uniform(instructions, symtab, "gl_Point",
 581                symtab->get_type("gl_PointParameters"));
 582
 583    const glsl_type *const material_parameters_type =
 584       symtab->get_type("gl_MaterialParameters");
 585    add_uniform(instructions, symtab, "gl_FrontMaterial", material_parameters_type);
 586    add_uniform(instructions, symtab, "gl_BackMaterial", material_parameters_type);
 587
 588    const glsl_type *const light_source_array_type =
 589       glsl_type::get_array_instance(symtab->get_type("gl_LightSourceParameters"), state->Const.MaxLights);
 590
 591    add_uniform(instructions, symtab, "gl_LightSource", light_source_array_type);
 592
 593    const glsl_type *const light_model_products_type =
 594       symtab->get_type("gl_LightModelProducts");
 595    add_uniform(instructions, symtab, "gl_FrontLightModelProduct",
 596                light_model_products_type);
 597    add_uniform(instructions, symtab, "gl_BackLightModelProduct",
 598                light_model_products_type);
 599
 600    const glsl_type *const light_products_type =
 601       glsl_type::get_array_instance(symtab->get_type("gl_LightProducts"),
 602                                     state->Const.MaxLights);
 603    add_uniform(instructions, symtab, "gl_FrontLightProduct", light_products_type);
 604    add_uniform(instructions, symtab, "gl_BackLightProduct", light_products_type);
 605
 606    add_uniform(instructions, symtab, "gl_TextureEnvColor",
 607                glsl_type::get_array_instance(glsl_type::vec4_type,
 608                                              state->Const.MaxTextureUnits));
 609
 610    const glsl_type *const texcoords_vec4 =
 611       glsl_type::get_array_instance(glsl_type::vec4_type,
 612                                     state->Const.MaxTextureCoords);
 613    add_uniform(instructions, symtab, "gl_EyePlaneS", texcoords_vec4);
 614    add_uniform(instructions, symtab, "gl_EyePlaneT", texcoords_vec4);
 615    add_uniform(instructions, symtab, "gl_EyePlaneR", texcoords_vec4);
 616    add_uniform(instructions, symtab, "gl_EyePlaneQ", texcoords_vec4);
 617    add_uniform(instructions, symtab, "gl_ObjectPlaneS", texcoords_vec4);
 618    add_uniform(instructions, symtab, "gl_ObjectPlaneT", texcoords_vec4);
 619    add_uniform(instructions, symtab, "gl_ObjectPlaneR", texcoords_vec4);
 620    add_uniform(instructions, symtab, "gl_ObjectPlaneQ", texcoords_vec4);
 621
 622    add_uniform(instructions, symtab, "gl_Fog",
 623                symtab->get_type("gl_FogParameters"));
 624
 625    /* Mesa-internal current attrib state */
 626    const glsl_type *const vert_attribs =
 627       glsl_type::get_array_instance(glsl_type::vec4_type, VERT_ATTRIB_MAX);
 628    add_uniform(instructions, symtab, "gl_CurrentAttribVertMESA", vert_attribs);
 629    const glsl_type *const frag_attribs =
 630       glsl_type::get_array_instance(glsl_type::vec4_type, FRAG_ATTRIB_MAX);
 631    add_uniform(instructions, symtab, "gl_CurrentAttribFragMESA", frag_attribs);
 632 }
 633
 634 /* This function should only be called for ES, not desktop GL. */
 635 static void
 636 generate_100ES_vs_variables(exec_list *instructions,
 637                           struct _mesa_glsl_parse_state *state)
 638 {
 639    for (unsigned i = 0; i < Elements(builtin_core_vs_variables); i++) {
 640       add_builtin_variable(instructions, state->symbols,
 641                            & builtin_core_vs_variables[i]);
 642    }
 643
 644    generate_100ES_uniforms(instructions, state);
 645
 646    generate_ARB_draw_buffers_variables(instructions, state, false,
 647                                        vertex_shader);
 648 }
 649
 650
 651 static void
 652 generate_110_vs_variables(exec_list *instructions,
 653                           struct _mesa_glsl_parse_state *state)
 654 {
 655    for (unsigned i = 0; i < Elements(builtin_core_vs_variables); i++) {
 656       add_builtin_variable(instructions, state->symbols,
 657                            & builtin_core_vs_variables[i]);
 658    }
 659
 660    for (unsigned i = 0
 661            ; i < Elements(builtin_110_deprecated_vs_variables)
 662            ; i++) {
 663       add_builtin_variable(instructions, state->symbols,
 664                            & builtin_110_deprecated_vs_variables[i]);
 665    }
 666    generate_110_uniforms(instructions, state);
 667
 668    /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
 669     *
 670     *     "As with all arrays, indices used to subscript gl_TexCoord must
 671     *     either be an integral constant expressions, or this array must be
 672     *     re-declared by the shader with a size. The size can be at most
 673     *     gl_MaxTextureCoords. Using indexes close to 0 may aid the
 674     *     implementation in preserving varying resources."
 675     */
 676    const glsl_type *const vec4_array_type =
 677       glsl_type::get_array_instance(glsl_type::vec4_type, 0);
 678
 679    add_variable(instructions, state->symbols,
 680                 "gl_TexCoord", vec4_array_type, ir_var_out, VERT_RESULT_TEX0);
 681
 682    generate_ARB_draw_buffers_variables(instructions, state, false,
 683                                        vertex_shader);
 684 }
 685
 686
 687 static void
 688 generate_120_vs_variables(exec_list *instructions,
 689                           struct _mesa_glsl_parse_state *state)
 690 {
 691    /* GLSL version 1.20 did not add any built-in variables in the vertex
 692     * shader.
 693     */
 694    generate_110_vs_variables(instructions, state);
 695 }
 696
 697
 698 static void
 699 generate_130_uniforms(exec_list *instructions,
 700                       struct _mesa_glsl_parse_state *state)
 701 {
 702    glsl_symbol_table *const symtab = state->symbols;
 703
 704    add_builtin_constant(instructions, symtab, "gl_MaxClipDistances",
 705                         state->Const.MaxClipPlanes);
 706    add_builtin_constant(instructions, symtab, "gl_MaxVaryingComponents",
 707                         state->Const.MaxVaryingFloats);
 708 }
 709
 710
 711 static void
 712 generate_130_vs_variables(exec_list *instructions,
 713                           struct _mesa_glsl_parse_state *state)
 714 {
 715    generate_120_vs_variables(instructions, state);
 716
 717    for (unsigned i = 0; i < Elements(builtin_130_vs_variables); i++) {
 718       add_builtin_variable(instructions, state->symbols,
 719                            & builtin_130_vs_variables[i]);
 720    }
 721
 722    generate_130_uniforms(instructions, state);
 723
 724    /* From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special
 725     * Variables):
 726     *
 727     *   The gl_ClipDistance array is predeclared as unsized and must
 728     *   be sized by the shader either redeclaring it with a size or
 729     *   indexing it only with integral constant expressions.
 730     *
 731     * We represent this in Mesa by initially declaring the array as
 732     * size 0.
 733     */
 734    const glsl_type *const clip_distance_array_type =
 735       glsl_type::get_array_instance(glsl_type::float_type, 0);
 736
 737    add_variable(instructions, state->symbols,
 738                 "gl_ClipDistance", clip_distance_array_type, ir_var_out,
 739                 VERT_RESULT_CLIP_DIST0);
 740
 741 }
 742
 743
 744 static void
 745 initialize_vs_variables(exec_list *instructions,
 746                         struct _mesa_glsl_parse_state *state)
 747 {
 748
 749    switch (state->language_version) {
 750    case 100:
 751       generate_100ES_vs_variables(instructions, state);
 752       break;
 753    case 110:
 754       generate_110_vs_variables(instructions, state);
 755       break;
 756    case 120:
 757       generate_120_vs_variables(instructions, state);
 758       break;
 759    case 130:
 760       generate_130_vs_variables(instructions, state);
 761       break;
 762    }
 763
 764    if (state->ARB_draw_instanced_enable)
 765       generate_ARB_draw_instanced_variables(instructions, state, false,
 766                                             vertex_shader);
 767 }
 768
 769
 770 /* This function should only be called for ES, not desktop GL. */
 771 static void
 772 generate_100ES_fs_variables(exec_list *instructions,
 773                           struct _mesa_glsl_parse_state *state)
 774 {
 775    for (unsigned i = 0; i < Elements(builtin_core_fs_variables); i++) {
 776       add_builtin_variable(instructions, state->symbols,
 777                            & builtin_core_fs_variables[i]);
 778    }
 779
 780    for (unsigned i = 0; i < Elements(builtin_100ES_fs_variables); i++) {
 781       add_builtin_variable(instructions, state->symbols,
 782                            & builtin_100ES_fs_variables[i]);
 783    }
 784
 785    generate_100ES_uniforms(instructions, state);
 786
 787    generate_ARB_draw_buffers_variables(instructions, state, false,
 788                                        fragment_shader);
 789 }
 790
 791 static void
 792 generate_110_fs_variables(exec_list *instructions,
 793                           struct _mesa_glsl_parse_state *state)
 794 {
 795    for (unsigned i = 0; i < Elements(builtin_core_fs_variables); i++) {
 796       add_builtin_variable(instructions, state->symbols,
 797                            & builtin_core_fs_variables[i]);
 798    }
 799
 800    for (unsigned i = 0; i < Elements(builtin_110_fs_variables); i++) {
 801       add_builtin_variable(instructions, state->symbols,
 802                            & builtin_110_fs_variables[i]);
 803    }
 804
 805    for (unsigned i = 0
 806            ; i < Elements(builtin_110_deprecated_fs_variables)
 807            ; i++) {
 808       add_builtin_variable(instructions, state->symbols,
 809                            & builtin_110_deprecated_fs_variables[i]);
 810    }
 811    generate_110_uniforms(instructions, state);
 812
 813    /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
 814     *
 815     *     "As with all arrays, indices used to subscript gl_TexCoord must
 816     *     either be an integral constant expressions, or this array must be
 817     *     re-declared by the shader with a size. The size can be at most
 818     *     gl_MaxTextureCoords. Using indexes close to 0 may aid the
 819     *     implementation in preserving varying resources."
 820     */
 821    const glsl_type *const vec4_array_type =
 822       glsl_type::get_array_instance(glsl_type::vec4_type, 0);
 823
 824    add_variable(instructions, state->symbols,
 825                 "gl_TexCoord", vec4_array_type, ir_var_in, FRAG_ATTRIB_TEX0);
 826
 827    generate_ARB_draw_buffers_variables(instructions, state, false,
 828                                        fragment_shader);
 829 }
 830
 831
 832 static void
 833 generate_ARB_draw_buffers_variables(exec_list *instructions,
 834                                     struct _mesa_glsl_parse_state *state,
 835                                     bool warn, _mesa_glsl_parser_targets target)
 836 {
 837    /* gl_MaxDrawBuffers is available in all shader stages.
 838     */
 839    ir_variable *const mdb =
 840       add_builtin_constant(instructions, state->symbols, "gl_MaxDrawBuffers",
 841                            state->Const.MaxDrawBuffers);
 842
 843    if (warn)
 844       mdb->warn_extension = "GL_ARB_draw_buffers";
 845
 846    /* gl_FragData is only available in the fragment shader.
 847     */
 848    if (target == fragment_shader) {
 849       const glsl_type *const vec4_array_type =
 850          glsl_type::get_array_instance(glsl_type::vec4_type,
 851                                        state->Const.MaxDrawBuffers);
 852
 853       ir_variable *const fd =
 854          add_variable(instructions, state->symbols,
 855                       "gl_FragData", vec4_array_type,
 856                       ir_var_out, FRAG_RESULT_DATA0);
 857
 858       if (warn)
 859          fd->warn_extension = "GL_ARB_draw_buffers";
 860    }
 861 }
 862
 863
 864 static void
 865 generate_ARB_draw_instanced_variables(exec_list *instructions,
 866                                       struct _mesa_glsl_parse_state *state,
 867                                       bool warn,
 868                                       _mesa_glsl_parser_targets target)
 869 {
 870    /* gl_InstanceIDARB is only available in the vertex shader.
 871     */
 872    if (target == vertex_shader) {
 873       ir_variable *const inst =
 874          add_variable(instructions, state->symbols,
 875                       "gl_InstanceIDARB", glsl_type::int_type,
 876                       ir_var_system_value, SYSTEM_VALUE_INSTANCE_ID);
 877
 878       if (warn)
 879          inst->warn_extension = "GL_ARB_draw_instanced";
 880    }
 881 }
 882
 883
 884 static void
 885 generate_ARB_shader_stencil_export_variables(exec_list *instructions,
 886                                              struct _mesa_glsl_parse_state *state,
 887                                              bool warn)
 888 {
 889    /* gl_FragStencilRefARB is only available in the fragment shader.
 890     */
 891    ir_variable *const fd =
 892       add_variable(instructions, state->symbols,
 893                    "gl_FragStencilRefARB", glsl_type::int_type,
 894                    ir_var_out, FRAG_RESULT_STENCIL);
 895
 896    if (warn)
 897       fd->warn_extension = "GL_ARB_shader_stencil_export";
 898 }
 899
 900 static void
 901 generate_AMD_shader_stencil_export_variables(exec_list *instructions,
 902                                              struct _mesa_glsl_parse_state *state,
 903                                              bool warn)
 904 {
 905    /* gl_FragStencilRefAMD is only available in the fragment shader.
 906     */
 907    ir_variable *const fd =
 908       add_variable(instructions, state->symbols,
 909                    "gl_FragStencilRefAMD", glsl_type::int_type,
 910                    ir_var_out, FRAG_RESULT_STENCIL);
 911
 912    if (warn)
 913       fd->warn_extension = "GL_AMD_shader_stencil_export";
 914 }
 915
 916 static void
 917 generate_120_fs_variables(exec_list *instructions,
 918                           struct _mesa_glsl_parse_state *state)
 919 {
 920    generate_110_fs_variables(instructions, state);
 921
 922    for (unsigned i = 0
 923            ; i < Elements(builtin_120_fs_variables)
 924            ; i++) {
 925       add_builtin_variable(instructions, state->symbols,
 926                            & builtin_120_fs_variables[i]);
 927    }
 928 }
 929
 930 static void
 931 generate_130_fs_variables(exec_list *instructions,
 932                           struct _mesa_glsl_parse_state *state)
 933 {
 934    generate_120_fs_variables(instructions, state);
 935
 936    generate_130_uniforms(instructions, state);
 937
 938    /* From the GLSL 1.30 spec, section 7.2 (Fragment Shader Special
 939     * Variables):
 940     *
 941     *   The built-in input variable gl_ClipDistance array contains linearly
 942     *   interpolated values for the vertex values written by the vertex shader
 943     *   to the gl_ClipDistance vertex output variable. This array must be
 944     *   sized in the fragment shader either implicitly or explicitly to be the
 945     *   same size as it was sized in the vertex shader.
 946     *
 947     * In other words, the array must be pre-declared as implicitly sized.  We
 948     * represent this in Mesa by initially declaring the array as size 0.
 949     */
 950    const glsl_type *const clip_distance_array_type =
 951       glsl_type::get_array_instance(glsl_type::float_type, 0);
 952
 953    add_variable(instructions, state->symbols,
 954                 "gl_ClipDistance", clip_distance_array_type, ir_var_in,
 955                 FRAG_ATTRIB_CLIP_DIST0);
 956 }
 957
 958 static void
 959 initialize_fs_variables(exec_list *instructions,
 960                         struct _mesa_glsl_parse_state *state)
 961 {
 962
 963    switch (state->language_version) {
 964    case 100:
 965       generate_100ES_fs_variables(instructions, state);
 966       break;
 967    case 110:
 968       generate_110_fs_variables(instructions, state);
 969       break;
 970    case 120:
 971       generate_120_fs_variables(instructions, state);
 972       break;
 973    case 130:
 974       generate_130_fs_variables(instructions, state);
 975       break;
 976    }
 977
 978    if (state->ARB_shader_stencil_export_enable)
 979       generate_ARB_shader_stencil_export_variables(instructions, state,
 980                                                    state->ARB_shader_stencil_export_warn);
 981
 982    if (state->AMD_shader_stencil_export_enable)
 983       generate_AMD_shader_stencil_export_variables(instructions, state,
 984                                                    state->AMD_shader_stencil_export_warn);
 985 }
 986
 987 void
 988 _mesa_glsl_initialize_variables(exec_list *instructions,
 989                                 struct _mesa_glsl_parse_state *state)
 990 {
 991    switch (state->target) {
 992    case vertex_shader:
 993       initialize_vs_variables(instructions, state);
 994       break;
 995    case geometry_shader:
 996       break;
 997    case fragment_shader:
 998       initialize_fs_variables(instructions, state);
 999       break;
1000    }
1001 }