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                       bool add_deprecated)
 533 {
 534    glsl_symbol_table *const symtab = state->symbols;
 535
 536    if (add_deprecated) {
 537       for (unsigned i = 0
 538               ; i < Elements(builtin_110_deprecated_uniforms)
 539               ; i++) {
 540          add_builtin_variable(instructions, symtab,
 541                               & builtin_110_deprecated_uniforms[i]);
 542       }
 543    }
 544
 545    if (add_deprecated) {
 546       add_builtin_constant(instructions, symtab, "gl_MaxLights",
 547                            state->Const.MaxLights);
 548       add_builtin_constant(instructions, symtab, "gl_MaxClipPlanes",
 549                            state->Const.MaxClipPlanes);
 550       add_builtin_constant(instructions, symtab, "gl_MaxTextureUnits",
 551                            state->Const.MaxTextureUnits);
 552       add_builtin_constant(instructions, symtab, "gl_MaxTextureCoords",
 553                            state->Const.MaxTextureCoords);
 554    }
 555    add_builtin_constant(instructions, symtab, "gl_MaxVertexAttribs",
 556                         state->Const.MaxVertexAttribs);
 557    add_builtin_constant(instructions, symtab, "gl_MaxVertexUniformComponents",
 558                         state->Const.MaxVertexUniformComponents);
 559    add_builtin_constant(instructions, symtab, "gl_MaxVaryingFloats",
 560                         state->Const.MaxVaryingFloats);
 561    add_builtin_constant(instructions, symtab, "gl_MaxVertexTextureImageUnits",
 562                         state->Const.MaxVertexTextureImageUnits);
 563    add_builtin_constant(instructions, symtab, "gl_MaxCombinedTextureImageUnits",
 564                         state->Const.MaxCombinedTextureImageUnits);
 565    add_builtin_constant(instructions, symtab, "gl_MaxTextureImageUnits",
 566                         state->Const.MaxTextureImageUnits);
 567    add_builtin_constant(instructions, symtab, "gl_MaxFragmentUniformComponents",
 568                         state->Const.MaxFragmentUniformComponents);
 569
 570    if (add_deprecated) {
 571       const glsl_type *const mat4_array_type =
 572          glsl_type::get_array_instance(glsl_type::mat4_type,
 573                                        state->Const.MaxTextureCoords);
 574
 575       add_uniform(instructions, symtab, "gl_TextureMatrix", mat4_array_type);
 576       add_uniform(instructions, symtab, "gl_TextureMatrixInverse", mat4_array_type);
 577       add_uniform(instructions, symtab, "gl_TextureMatrixTranspose", mat4_array_type);
 578       add_uniform(instructions, symtab, "gl_TextureMatrixInverseTranspose", mat4_array_type);
 579    }
 580
 581    add_uniform(instructions, symtab, "gl_DepthRange",
 582                 symtab->get_type("gl_DepthRangeParameters"));
 583
 584    if (add_deprecated) {
 585       add_uniform(instructions, symtab, "gl_ClipPlane",
 586                   glsl_type::get_array_instance(glsl_type::vec4_type,
 587                                                 state->Const.MaxClipPlanes));
 588       add_uniform(instructions, symtab, "gl_Point",
 589                   symtab->get_type("gl_PointParameters"));
 590
 591       const glsl_type *const material_parameters_type =
 592          symtab->get_type("gl_MaterialParameters");
 593       add_uniform(instructions, symtab, "gl_FrontMaterial", material_parameters_type);
 594       add_uniform(instructions, symtab, "gl_BackMaterial", material_parameters_type);
 595
 596       const glsl_type *const light_source_array_type =
 597          glsl_type::get_array_instance(symtab->get_type("gl_LightSourceParameters"), state->Const.MaxLights);
 598
 599       add_uniform(instructions, symtab, "gl_LightSource", light_source_array_type);
 600
 601       const glsl_type *const light_model_products_type =
 602          symtab->get_type("gl_LightModelProducts");
 603       add_uniform(instructions, symtab, "gl_FrontLightModelProduct",
 604                   light_model_products_type);
 605       add_uniform(instructions, symtab, "gl_BackLightModelProduct",
 606                   light_model_products_type);
 607
 608       const glsl_type *const light_products_type =
 609          glsl_type::get_array_instance(symtab->get_type("gl_LightProducts"),
 610                                        state->Const.MaxLights);
 611       add_uniform(instructions, symtab, "gl_FrontLightProduct", light_products_type);
 612       add_uniform(instructions, symtab, "gl_BackLightProduct", light_products_type);
 613
 614       add_uniform(instructions, symtab, "gl_TextureEnvColor",
 615                   glsl_type::get_array_instance(glsl_type::vec4_type,
 616                                                 state->Const.MaxTextureUnits));
 617
 618       const glsl_type *const texcoords_vec4 =
 619          glsl_type::get_array_instance(glsl_type::vec4_type,
 620                                        state->Const.MaxTextureCoords);
 621       add_uniform(instructions, symtab, "gl_EyePlaneS", texcoords_vec4);
 622       add_uniform(instructions, symtab, "gl_EyePlaneT", texcoords_vec4);
 623       add_uniform(instructions, symtab, "gl_EyePlaneR", texcoords_vec4);
 624       add_uniform(instructions, symtab, "gl_EyePlaneQ", texcoords_vec4);
 625       add_uniform(instructions, symtab, "gl_ObjectPlaneS", texcoords_vec4);
 626       add_uniform(instructions, symtab, "gl_ObjectPlaneT", texcoords_vec4);
 627       add_uniform(instructions, symtab, "gl_ObjectPlaneR", texcoords_vec4);
 628       add_uniform(instructions, symtab, "gl_ObjectPlaneQ", texcoords_vec4);
 629
 630       add_uniform(instructions, symtab, "gl_Fog",
 631                   symtab->get_type("gl_FogParameters"));
 632    }
 633
 634    /* Mesa-internal current attrib state */
 635    const glsl_type *const vert_attribs =
 636       glsl_type::get_array_instance(glsl_type::vec4_type, VERT_ATTRIB_MAX);
 637    add_uniform(instructions, symtab, "gl_CurrentAttribVertMESA", vert_attribs);
 638    const glsl_type *const frag_attribs =
 639       glsl_type::get_array_instance(glsl_type::vec4_type, FRAG_ATTRIB_MAX);
 640    add_uniform(instructions, symtab, "gl_CurrentAttribFragMESA", frag_attribs);
 641 }
 642
 643 /* This function should only be called for ES, not desktop GL. */
 644 static void
 645 generate_100ES_vs_variables(exec_list *instructions,
 646                           struct _mesa_glsl_parse_state *state)
 647 {
 648    for (unsigned i = 0; i < Elements(builtin_core_vs_variables); i++) {
 649       add_builtin_variable(instructions, state->symbols,
 650                            & builtin_core_vs_variables[i]);
 651    }
 652
 653    generate_100ES_uniforms(instructions, state);
 654
 655    generate_ARB_draw_buffers_variables(instructions, state, false,
 656                                        vertex_shader);
 657 }
 658
 659
 660 static void
 661 generate_110_vs_variables(exec_list *instructions,
 662                           struct _mesa_glsl_parse_state *state,
 663                           bool add_deprecated)
 664 {
 665    for (unsigned i = 0; i < Elements(builtin_core_vs_variables); i++) {
 666       add_builtin_variable(instructions, state->symbols,
 667                            & builtin_core_vs_variables[i]);
 668    }
 669
 670    if (add_deprecated) {
 671       for (unsigned i = 0
 672               ; i < Elements(builtin_110_deprecated_vs_variables)
 673               ; i++) {
 674          add_builtin_variable(instructions, state->symbols,
 675                               & builtin_110_deprecated_vs_variables[i]);
 676       }
 677    }
 678    generate_110_uniforms(instructions, state, add_deprecated);
 679
 680    /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
 681     *
 682     *     "As with all arrays, indices used to subscript gl_TexCoord must
 683     *     either be an integral constant expressions, or this array must be
 684     *     re-declared by the shader with a size. The size can be at most
 685     *     gl_MaxTextureCoords. Using indexes close to 0 may aid the
 686     *     implementation in preserving varying resources."
 687     */
 688    const glsl_type *const vec4_array_type =
 689       glsl_type::get_array_instance(glsl_type::vec4_type, 0);
 690
 691    add_variable(instructions, state->symbols,
 692                 "gl_TexCoord", vec4_array_type, ir_var_out, VERT_RESULT_TEX0);
 693
 694    generate_ARB_draw_buffers_variables(instructions, state, false,
 695                                        vertex_shader);
 696 }
 697
 698
 699 static void
 700 generate_120_vs_variables(exec_list *instructions,
 701                           struct _mesa_glsl_parse_state *state,
 702                           bool add_deprecated)
 703 {
 704    /* GLSL version 1.20 did not add any built-in variables in the vertex
 705     * shader.
 706     */
 707    generate_110_vs_variables(instructions, state, add_deprecated);
 708 }
 709
 710
 711 static void
 712 generate_130_uniforms(exec_list *instructions,
 713                       struct _mesa_glsl_parse_state *state)
 714 {
 715    glsl_symbol_table *const symtab = state->symbols;
 716
 717    add_builtin_constant(instructions, symtab, "gl_MaxClipDistances",
 718                         state->Const.MaxClipPlanes);
 719    add_builtin_constant(instructions, symtab, "gl_MaxVaryingComponents",
 720                         state->Const.MaxVaryingFloats);
 721 }
 722
 723
 724 static void
 725 generate_130_vs_variables(exec_list *instructions,
 726                           struct _mesa_glsl_parse_state *state,
 727                           bool add_deprecated)
 728 {
 729    generate_120_vs_variables(instructions, state, add_deprecated);
 730
 731    for (unsigned i = 0; i < Elements(builtin_130_vs_variables); i++) {
 732       add_builtin_variable(instructions, state->symbols,
 733                            & builtin_130_vs_variables[i]);
 734    }
 735
 736    generate_130_uniforms(instructions, state);
 737
 738    /* From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special
 739     * Variables):
 740     *
 741     *   The gl_ClipDistance array is predeclared as unsized and must
 742     *   be sized by the shader either redeclaring it with a size or
 743     *   indexing it only with integral constant expressions.
 744     *
 745     * We represent this in Mesa by initially declaring the array as
 746     * size 0.
 747     */
 748    const glsl_type *const clip_distance_array_type =
 749       glsl_type::get_array_instance(glsl_type::float_type, 0);
 750
 751    add_variable(instructions, state->symbols,
 752                 "gl_ClipDistance", clip_distance_array_type, ir_var_out,
 753                 VERT_RESULT_CLIP_DIST0);
 754
 755 }
 756
 757
 758 static void
 759 initialize_vs_variables(exec_list *instructions,
 760                         struct _mesa_glsl_parse_state *state)
 761 {
 762
 763    switch (state->language_version) {
 764    case 100:
 765       generate_100ES_vs_variables(instructions, state);
 766       break;
 767    case 110:
 768       generate_110_vs_variables(instructions, state, true);
 769       break;
 770    case 120:
 771       generate_120_vs_variables(instructions, state, true);
 772       break;
 773    case 130:
 774       generate_130_vs_variables(instructions, state, true);
 775       break;
 776    case 140:
 777       generate_130_vs_variables(instructions, state, false);
 778       break;
 779    }
 780
 781    generate_ARB_draw_instanced_variables(instructions, state, false,
 782                                          vertex_shader);
 783 }
 784
 785
 786 /* This function should only be called for ES, not desktop GL. */
 787 static void
 788 generate_100ES_fs_variables(exec_list *instructions,
 789                           struct _mesa_glsl_parse_state *state)
 790 {
 791    for (unsigned i = 0; i < Elements(builtin_core_fs_variables); i++) {
 792       add_builtin_variable(instructions, state->symbols,
 793                            & builtin_core_fs_variables[i]);
 794    }
 795
 796    for (unsigned i = 0; i < Elements(builtin_100ES_fs_variables); i++) {
 797       add_builtin_variable(instructions, state->symbols,
 798                            & builtin_100ES_fs_variables[i]);
 799    }
 800
 801    generate_100ES_uniforms(instructions, state);
 802
 803    generate_ARB_draw_buffers_variables(instructions, state, false,
 804                                        fragment_shader);
 805 }
 806
 807 static void
 808 generate_110_fs_variables(exec_list *instructions,
 809                           struct _mesa_glsl_parse_state *state,
 810                           bool add_deprecated)
 811 {
 812    for (unsigned i = 0; i < Elements(builtin_core_fs_variables); i++) {
 813       add_builtin_variable(instructions, state->symbols,
 814                            & builtin_core_fs_variables[i]);
 815    }
 816
 817    for (unsigned i = 0; i < Elements(builtin_110_fs_variables); i++) {
 818       add_builtin_variable(instructions, state->symbols,
 819                            & builtin_110_fs_variables[i]);
 820    }
 821
 822    if (add_deprecated) {
 823       for (unsigned i = 0
 824               ; i < Elements(builtin_110_deprecated_fs_variables)
 825               ; i++) {
 826          add_builtin_variable(instructions, state->symbols,
 827                               & builtin_110_deprecated_fs_variables[i]);
 828       }
 829    }
 830
 831    generate_110_uniforms(instructions, state, add_deprecated);
 832
 833    /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
 834     *
 835     *     "As with all arrays, indices used to subscript gl_TexCoord must
 836     *     either be an integral constant expressions, or this array must be
 837     *     re-declared by the shader with a size. The size can be at most
 838     *     gl_MaxTextureCoords. Using indexes close to 0 may aid the
 839     *     implementation in preserving varying resources."
 840     */
 841    const glsl_type *const vec4_array_type =
 842       glsl_type::get_array_instance(glsl_type::vec4_type, 0);
 843
 844    add_variable(instructions, state->symbols,
 845                 "gl_TexCoord", vec4_array_type, ir_var_in, FRAG_ATTRIB_TEX0);
 846
 847    generate_ARB_draw_buffers_variables(instructions, state, false,
 848                                        fragment_shader);
 849 }
 850
 851
 852 static void
 853 generate_ARB_draw_buffers_variables(exec_list *instructions,
 854                                     struct _mesa_glsl_parse_state *state,
 855                                     bool warn, _mesa_glsl_parser_targets target)
 856 {
 857    /* gl_MaxDrawBuffers is available in all shader stages.
 858     */
 859    ir_variable *const mdb =
 860       add_builtin_constant(instructions, state->symbols, "gl_MaxDrawBuffers",
 861                            state->Const.MaxDrawBuffers);
 862
 863    if (warn)
 864       mdb->warn_extension = "GL_ARB_draw_buffers";
 865
 866    /* gl_FragData is only available in the fragment shader.
 867     */
 868    if (target == fragment_shader) {
 869       const glsl_type *const vec4_array_type =
 870          glsl_type::get_array_instance(glsl_type::vec4_type,
 871                                        state->Const.MaxDrawBuffers);
 872
 873       ir_variable *const fd =
 874          add_variable(instructions, state->symbols,
 875                       "gl_FragData", vec4_array_type,
 876                       ir_var_out, FRAG_RESULT_DATA0);
 877
 878       if (warn)
 879          fd->warn_extension = "GL_ARB_draw_buffers";
 880    }
 881 }
 882
 883
 884 static void
 885 generate_ARB_draw_instanced_variables(exec_list *instructions,
 886                                       struct _mesa_glsl_parse_state *state,
 887                                       bool warn,
 888                                       _mesa_glsl_parser_targets target)
 889 {
 890    /* gl_InstanceIDARB is only available in the vertex shader.
 891     */
 892    if (target != vertex_shader)
 893       return;
 894
 895    if (state->ARB_draw_instanced_enable) {
 896       ir_variable *inst =
 897          add_variable(instructions, state->symbols,
 898                       "gl_InstanceIDARB", glsl_type::int_type,
 899                       ir_var_system_value, SYSTEM_VALUE_INSTANCE_ID);
 900
 901       if (warn)
 902          inst->warn_extension = "GL_ARB_draw_instanced";
 903    }
 904
 905    if (state->ARB_draw_instanced_enable || state->language_version >= 140) {
 906       /* Originally ARB_draw_instanced only specified that ARB decorated name.
 907        * Since no vendor actually implemented that behavior and some apps use
 908        * the undecorated name, the extension now specifies that both names are
 909        * available.
 910        */
 911       ir_variable *inst =
 912          add_variable(instructions, state->symbols,
 913                       "gl_InstanceID", glsl_type::int_type,
 914                       ir_var_system_value, SYSTEM_VALUE_INSTANCE_ID);
 915
 916       if (state->language_version < 140 && warn)
 917          inst->warn_extension = "GL_ARB_draw_instanced";
 918    }
 919 }
 920
 921
 922 static void
 923 generate_ARB_shader_stencil_export_variables(exec_list *instructions,
 924                                              struct _mesa_glsl_parse_state *state,
 925                                              bool warn)
 926 {
 927    /* gl_FragStencilRefARB is only available in the fragment shader.
 928     */
 929    ir_variable *const fd =
 930       add_variable(instructions, state->symbols,
 931                    "gl_FragStencilRefARB", glsl_type::int_type,
 932                    ir_var_out, FRAG_RESULT_STENCIL);
 933
 934    if (warn)
 935       fd->warn_extension = "GL_ARB_shader_stencil_export";
 936 }
 937
 938 static void
 939 generate_AMD_shader_stencil_export_variables(exec_list *instructions,
 940                                              struct _mesa_glsl_parse_state *state,
 941                                              bool warn)
 942 {
 943    /* gl_FragStencilRefAMD is only available in the fragment shader.
 944     */
 945    ir_variable *const fd =
 946       add_variable(instructions, state->symbols,
 947                    "gl_FragStencilRefAMD", glsl_type::int_type,
 948                    ir_var_out, FRAG_RESULT_STENCIL);
 949
 950    if (warn)
 951       fd->warn_extension = "GL_AMD_shader_stencil_export";
 952 }
 953
 954 static void
 955 generate_120_fs_variables(exec_list *instructions,
 956                           struct _mesa_glsl_parse_state *state,
 957                           bool add_deprecated)
 958 {
 959    generate_110_fs_variables(instructions, state, add_deprecated);
 960
 961    for (unsigned i = 0
 962            ; i < Elements(builtin_120_fs_variables)
 963            ; i++) {
 964       add_builtin_variable(instructions, state->symbols,
 965                            & builtin_120_fs_variables[i]);
 966    }
 967 }
 968
 969 static void
 970 generate_fs_clipdistance(exec_list *instructions,
 971                          struct _mesa_glsl_parse_state *state)
 972 {
 973    /* From the GLSL 1.30 spec, section 7.2 (Fragment Shader Special
 974     * Variables):
 975     *
 976     *   The built-in input variable gl_ClipDistance array contains linearly
 977     *   interpolated values for the vertex values written by the vertex shader
 978     *   to the gl_ClipDistance vertex output variable. This array must be
 979     *   sized in the fragment shader either implicitly or explicitly to be the
 980     *   same size as it was sized in the vertex shader.
 981     *
 982     * In other words, the array must be pre-declared as implicitly sized.  We
 983     * represent this in Mesa by initially declaring the array as size 0.
 984     */
 985    const glsl_type *const clip_distance_array_type =
 986       glsl_type::get_array_instance(glsl_type::float_type, 0);
 987
 988    add_variable(instructions, state->symbols,
 989                 "gl_ClipDistance", clip_distance_array_type, ir_var_in,
 990                 FRAG_ATTRIB_CLIP_DIST0);
 991 }
 992
 993 static void
 994 generate_130_fs_variables(exec_list *instructions,
 995                           struct _mesa_glsl_parse_state *state)
 996 {
 997    generate_120_fs_variables(instructions, state, true);
 998
 999    generate_130_uniforms(instructions, state);
1000    generate_fs_clipdistance(instructions, state);
1001 }
1002
1003
1004 static void
1005 generate_140_fs_variables(exec_list *instructions,
1006                           struct _mesa_glsl_parse_state *state)
1007 {
1008    generate_120_fs_variables(instructions, state, false);
1009
1010    generate_130_uniforms(instructions, state);
1011    generate_fs_clipdistance(instructions, state);
1012 }
1013
1014 static void
1015 initialize_fs_variables(exec_list *instructions,
1016                         struct _mesa_glsl_parse_state *state)
1017 {
1018
1019    switch (state->language_version) {
1020    case 100:
1021       generate_100ES_fs_variables(instructions, state);
1022       break;
1023    case 110:
1024       generate_110_fs_variables(instructions, state, true);
1025       break;
1026    case 120:
1027       generate_120_fs_variables(instructions, state, true);
1028       break;
1029    case 130:
1030       generate_130_fs_variables(instructions, state);
1031       break;
1032    case 140:
1033       generate_140_fs_variables(instructions, state);
1034       break;
1035    }
1036
1037    if (state->ARB_shader_stencil_export_enable)
1038       generate_ARB_shader_stencil_export_variables(instructions, state,
1039                                                    state->ARB_shader_stencil_export_warn);
1040
1041    if (state->AMD_shader_stencil_export_enable)
1042       generate_AMD_shader_stencil_export_variables(instructions, state,
1043                                                    state->AMD_shader_stencil_export_warn);
1044 }
1045
1046 void
1047 _mesa_glsl_initialize_variables(exec_list *instructions,
1048                                 struct _mesa_glsl_parse_state *state)
1049 {
1050    switch (state->target) {
1051    case vertex_shader:
1052       initialize_vs_variables(instructions, state);
1053       break;
1054    case geometry_shader:
1055       break;
1056    case fragment_shader:
1057       initialize_fs_variables(instructions, state);
1058       break;
1059    }
1060 }