source/glsl/finalize.cpp

   1 #include <msp/core/algorithm.h>
   2 #include <msp/core/hash.h>
   3 #include <msp/core/raii.h>
   4 #include <msp/strings/lexicalcast.h>
   5 #include "finalize.h"
   6 #include "glsl_error.h"
   7 #include "reflect.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13 namespace SL {
  14
  15 void StructOrganizer::visit(StructDeclaration &strct)
  16 {
  17         SetForScope<int> set_offset(offset, 0);
  18         TraversingVisitor::visit(strct);
  19 }
  20
  21 void StructOrganizer::visit(VariableDeclaration &var)
  22 {
  23         if(offset>=0)
  24         {
  25                 int *layout_offset = 0;
  26                 bool has_matrix_order = false;
  27                 if(var.layout)
  28                 {
  29                         for(Layout::Qualifier &q: var.layout->qualifiers)
  30                         {
  31                                 if(q.name=="offset" && q.has_value)
  32                                 {
  33                                         layout_offset = &q.value;
  34                                         if(q.value>=offset)
  35                                                 offset = q.value;
  36                                 }
  37                                 else if(q.name=="column_major" || q.name=="row_major")
  38                                         has_matrix_order = true;
  39                         }
  40                 }
  41
  42                 MemoryRequirementsCalculator::Result mem_reqs = MemoryRequirementsCalculator().apply(var);
  43                 offset += mem_reqs.alignment-1;
  44                 offset -= offset%mem_reqs.alignment;
  45
  46                 if(layout_offset)
  47                         *layout_offset = offset;
  48                 else
  49                 {
  50                         if(!var.layout)
  51                                 var.layout = new Layout;
  52
  53                         var.layout->qualifiers.push_back(Layout::Qualifier("offset", offset));
  54                 }
  55
  56                 if(!has_matrix_order)
  57                 {
  58                         const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(var.type_declaration);
  59                         while(basic && basic->kind==BasicTypeDeclaration::ARRAY)
  60                                 basic = dynamic_cast<const BasicTypeDeclaration *>(basic->base_type);
  61                         if(basic && basic->kind==BasicTypeDeclaration::MATRIX)
  62                                 var.layout->qualifiers.push_back(Layout::Qualifier("column_major"));
  63                 }
  64
  65                 offset += mem_reqs.size;
  66         }
  67 }
  68
  69
  70 void LocationAllocator::apply(Module &module, const Features &features)
  71 {
  72         for(Stage &s: module.stages)
  73                 apply(s);
  74
  75         if(features.target_api!=VULKAN)
  76                 allocate_locations("uniform");
  77
  78         for(InterfaceBlock *b: unbound_blocks)
  79                 bind_uniform(b->layout, b->block_name, features.uniform_binding_range);
  80         for(VariableDeclaration *t: unbound_textures)
  81                 bind_uniform(t->layout, t->name, features.texture_binding_range);
  82 }
  83
  84 void LocationAllocator::apply(Stage &stage)
  85 {
  86         swap(used_locations["in"], used_locations["out"]);
  87         used_locations["out"].clear();
  88
  89         stage.content.visit(*this);
  90
  91         allocate_locations("in");
  92         allocate_locations("out");
  93 }
  94
  95 void LocationAllocator::allocate_locations(const string &iface)
  96 {
  97         auto write = unplaced_variables.begin();
  98         unsigned next = 0;
  99         for(auto i=unplaced_variables.begin(); i!=unplaced_variables.end(); ++i)
 100         {
 101                 if((*i)->interface!=iface)
 102                 {
 103                         if(write!=i)
 104                                 *write = *i;
 105                         ++write;
 106                         continue;
 107                 }
 108
 109                 if((*i)->interface=="uniform")
 110                 {
 111                         auto j = uniforms.find((*i)->name);
 112                         if(j!=uniforms.end() && j->second.location>=0)
 113                         {
 114                                 add_layout_value((*i)->layout, "location", j->second.location);
 115                                 continue;
 116                         }
 117                 }
 118
 119                 set<unsigned> &used = used_locations[(*i)->interface];
 120
 121                 unsigned size = LocationCounter().apply(**i);
 122                 while(1)
 123                 {
 124                         int blocking = -1;
 125                         for(unsigned j=0; j<size; ++j)
 126                                 if(used.count(next+j))
 127                                         blocking = next+j;
 128                         if(blocking<0)
 129                                 break;
 130                         next = blocking+1;
 131                 }
 132
 133                 add_layout_value((*i)->layout, "location", next);
 134                 if((*i)->interface=="uniform")
 135                         uniforms[(*i)->name].location = next;
 136
 137                 for(unsigned j=0; j<size; ++j)
 138                         used.insert(next+j);
 139                 next += size;
 140         }
 141
 142         unplaced_variables.erase(write, unplaced_variables.end());
 143 }
 144
 145 void LocationAllocator::bind_uniform(RefPtr<Layout> &layout, const string &name, unsigned range)
 146 {
 147         auto i = uniforms.find(name);
 148         if(i!=uniforms.end() && i->second.bind_point>=0)
 149                 add_layout_value(layout, "binding", i->second.bind_point);
 150         else
 151         {
 152                 set<unsigned> &used = used_bindings[0];
 153
 154                 unsigned bind_point = fold32(hash64(name))%range;
 155                 while(used.count(bind_point))
 156                         bind_point = (bind_point+1)%range;
 157
 158                 add_layout_value(layout, "binding", bind_point);
 159                 uniforms[name].bind_point = bind_point;
 160                 used.insert(bind_point);
 161         }
 162 }
 163
 164 void LocationAllocator::add_layout_value(RefPtr<Layout> &layout, const string &name, unsigned value)
 165 {
 166         if(!layout)
 167                 layout = new Layout;
 168
 169         layout->qualifiers.push_back(Layout::Qualifier(name, value));
 170 }
 171
 172 bool LocationAllocator::visit_uniform(const string &name, RefPtr<Layout> &layout)
 173 {
 174         int bind_point = (layout ? get_layout_value(*layout, "binding") : -1);
 175         if(bind_point>=0)
 176         {
 177                 used_bindings[0].insert(bind_point);
 178                 uniforms[name].bind_point = bind_point;
 179         }
 180         return bind_point>=0;
 181 }
 182
 183 void LocationAllocator::visit(VariableDeclaration &var)
 184 {
 185         if(!var.name.compare(0, 3, "gl_"))
 186                 return;
 187
 188         if(!var.interface.empty())
 189         {
 190                 int location = (var.layout ? get_layout_value(*var.layout, "location") : -1);
 191
 192                 if(location<0 && var.linked_declaration && var.linked_declaration->layout)
 193                 {
 194                         location = get_layout_value(*var.linked_declaration->layout, "location");
 195                         if(location>=0)
 196                                 add_layout_value(var.layout, "location", location);
 197                 }
 198
 199                 if(location>=0)
 200                 {
 201                         unsigned size = LocationCounter().apply(var);
 202                         for(unsigned i=0; i<size; ++i)
 203                                 used_locations[var.interface].insert(location+i);
 204                         if(var.interface=="uniform")
 205                                 uniforms[var.name].location = location;
 206                 }
 207                 else
 208                         unplaced_variables.push_back(&var);
 209         }
 210
 211         if(var.interface=="uniform")
 212         {
 213                 const TypeDeclaration *base_type = get_ultimate_base_type(var.type_declaration);
 214                 if(dynamic_cast<const ImageTypeDeclaration *>(base_type) && !visit_uniform(var.name, var.layout))
 215                         unbound_textures.push_back(&var);
 216         }
 217 }
 218
 219 void LocationAllocator::visit(InterfaceBlock &iface)
 220 {
 221         if(!iface.instance_name.compare(0, 3, "gl_"))
 222                 return;
 223
 224         if(iface.interface=="uniform")
 225         {
 226                 bool push_constant = false;
 227                 if(iface.layout)
 228                 {
 229                         auto i = find_member(iface.layout->qualifiers, string("push_constant"), &Layout::Qualifier::name);
 230                         push_constant = (i!=iface.layout->qualifiers.end());
 231                 }
 232
 233                 if(!push_constant && !visit_uniform(iface.block_name, iface.layout))
 234                         unbound_blocks.push_back(&iface);
 235         }
 236 }
 237
 238
 239 void PrecisionConverter::apply(Stage &s)
 240 {
 241         stage = &s;
 242         s.content.visit(*this);
 243         NodeRemover().apply(s, nodes_to_remove);
 244 }
 245
 246 void PrecisionConverter::visit(Block &block)
 247 {
 248         for(auto i=block.body.begin(); i!=block.body.end(); ++i)
 249         {
 250                 if(&block==&stage->content)
 251                         insert_point = i;
 252                 (*i)->visit(*this);
 253         }
 254 }
 255
 256 void PrecisionConverter::visit(Precision &prec)
 257 {
 258         if(stage->required_features.target_api==OPENGL_ES)
 259                 have_default.insert(prec.type);
 260         else
 261                 nodes_to_remove.insert(&prec);
 262 }
 263
 264 void PrecisionConverter::visit(VariableDeclaration &var)
 265 {
 266         if(stage->required_features.target_api!=OPENGL_ES)
 267         {
 268                 var.precision.clear();
 269                 return;
 270         }
 271
 272         const char *default_prec = (stage->type==Stage::FRAGMENT ? "mediump" : "highp");
 273         const TypeDeclaration *type = var.type_declaration;
 274         while(type)
 275         {
 276                 if(dynamic_cast<const ImageTypeDeclaration *>(type))
 277                 {
 278                         default_prec = "lowp";
 279                         break;
 280                 }
 281                 else if(const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(type))
 282                 {
 283                         if(basic->kind==BasicTypeDeclaration::INT || basic->kind==BasicTypeDeclaration::FLOAT)
 284                                 break;
 285                         type = basic->base_type;
 286                 }
 287                 else
 288                         return;
 289         }
 290         if(!type)
 291                 return;
 292
 293         if(!have_default.count(type->name))
 294         {
 295                 Precision *prec = new Precision;
 296                 prec->precision = default_prec;
 297                 prec->type = type->name;
 298                 stage->content.body.insert(insert_point, prec);
 299
 300                 have_default.insert(type->name);
 301         }
 302 }
 303
 304
 305 void FeatureConverter::apply(Stage &s, const Features &feat)
 306 {
 307         stage = &s;
 308         features = feat;
 309
 310         if(!stage->required_features.glsl_version)
 311                 stage->required_features.glsl_version = Version(1, (stage->required_features.target_api==OPENGL_ES ? 0 : 10));
 312
 313         apply();
 314 }
 315
 316 void FeatureConverter::unsupported(const string &reason)
 317 {
 318         Diagnostic diagnostic;
 319         diagnostic.severity = Diagnostic::ERR;
 320         diagnostic.source = GENERATED_SOURCE;
 321         diagnostic.line = 0;
 322         diagnostic.message = reason;
 323         stage->diagnostics.push_back(diagnostic);
 324 }
 325
 326 bool FeatureConverter::check_version(const Version &feature_version) const
 327 {
 328         if(features.glsl_version<feature_version)
 329                 return false;
 330         else if(stage->required_features.glsl_version<feature_version)
 331                 stage->required_features.glsl_version = feature_version;
 332
 333         return true;
 334 }
 335
 336 bool FeatureConverter::check_extension(bool Features::*extension) const
 337 {
 338         if(!(features.*extension))
 339                 return false;
 340
 341         stage->required_features.*extension = true;
 342
 343         return true;
 344 }
 345
 346
 347 void StructuralFeatureConverter::apply()
 348 {
 349         if(supports_stage(stage->type))
 350         {
 351                 stage->content.visit(*this);
 352                 NodeRemover().apply(*stage, nodes_to_remove);
 353         }
 354         else
 355                 unsupported(format("Stage %s is not supported", Stage::get_stage_name(stage->type)));
 356 }
 357
 358 void StructuralFeatureConverter::visit(Block &block)
 359 {
 360         for(auto i=block.body.begin(); i!=block.body.end(); ++i)
 361         {
 362                 if(&block==&stage->content)
 363                         uniform_insert_point = i;
 364                 (*i)->visit(*this);
 365         }
 366 }
 367
 368 void StructuralFeatureConverter::visit(RefPtr<Expression> &expr)
 369 {
 370         r_replaced_reference = 0;
 371         expr->visit(*this);
 372         if(r_replaced_reference)
 373                 expr = r_replaced_reference;
 374         r_replaced_reference = 0;
 375 }
 376
 377 bool StructuralFeatureConverter::supports_stage(Stage::Type st) const
 378 {
 379         if(st==Stage::GEOMETRY)
 380         {
 381                 if(features.target_api==VULKAN)
 382                         return true;
 383                 else if(features.target_api==OPENGL_ES)
 384                         return check_version(Version(3, 20));
 385                 else
 386                         return check_version(Version(1, 50));
 387         }
 388         else
 389                 return true;
 390 }
 391
 392 bool StructuralFeatureConverter::supports_unified_interface_syntax() const
 393 {
 394         if(features.target_api==VULKAN)
 395                 return true;
 396         else if(features.target_api==OPENGL_ES)
 397                 return check_version(Version(3, 0));
 398         else
 399                 return check_version(Version(1, 30));
 400 }
 401
 402 void StructuralFeatureConverter::visit(VariableReference &var)
 403 {
 404         if(var.declaration==frag_out && !supports_unified_interface_syntax())
 405         {
 406                 var.name = "gl_FragColor";
 407                 var.declaration = 0;
 408         }
 409 }
 410
 411 void StructuralFeatureConverter::visit(InterfaceBlockReference &iface)
 412 {
 413         r_flattened_interface = nodes_to_remove.count(iface.declaration);
 414 }
 415
 416 void StructuralFeatureConverter::visit(MemberAccess &memacc)
 417 {
 418         r_flattened_interface = false;
 419         visit(memacc.left);
 420         if(r_flattened_interface)
 421         {
 422                 VariableReference *var = new VariableReference;
 423                 var->name = memacc.member;
 424                 r_replaced_reference = var;
 425         }
 426 }
 427
 428 void StructuralFeatureConverter::visit(Assignment &assign)
 429 {
 430         TraversingVisitor::visit(assign);
 431         if(assign.target.declaration==frag_out && !supports_unified_interface_syntax())
 432                 assign.target.declaration = 0;
 433 }
 434
 435 bool StructuralFeatureConverter::supports_unified_sampling_functions() const
 436 {
 437         if(features.target_api==VULKAN)
 438                 return true;
 439         else if(features.target_api==OPENGL_ES)
 440                 return check_version(Version(3, 0));
 441         else
 442                 return check_version(Version(1, 30));
 443 }
 444
 445 void StructuralFeatureConverter::visit(FunctionCall &call)
 446 {
 447         if(call.declaration && call.declaration->source==BUILTIN_SOURCE)
 448         {
 449                 if(!call.name.compare(0, 7, "texture") && call.arguments.size()>=1)
 450                 {
 451                         const ImageTypeDeclaration *arg_image = dynamic_cast<const ImageTypeDeclaration *>(call.arguments.front()->type);
 452                         if(arg_image && !supports_unified_sampling_functions())
 453                         {
 454                                 string suffix = call.name.substr(7);
 455                                 call.name = (arg_image->shadow ? "shadow" : "texture");
 456
 457                                 switch(arg_image->dimensions)
 458                                 {
 459                                 case ImageTypeDeclaration::ONE: call.name += "1D"; break;
 460                                 case ImageTypeDeclaration::TWO: call.name += "2D"; break;
 461                                 case ImageTypeDeclaration::THREE: call.name += "3D"; break;
 462                                 case ImageTypeDeclaration::CUBE: call.name += "Cube"; break;
 463                                 }
 464
 465                                 if(arg_image->array)
 466                                 {
 467                                         /* Array textures and the unified sampling function name were
 468                                         both introduced in GLSL 1.30. */
 469                                         if(arg_image->dimensions==ImageTypeDeclaration::ONE || arg_image->dimensions==ImageTypeDeclaration::TWO)
 470                                                 check_extension(&Features::ext_texture_array);
 471                                         call.name += "Array";
 472                                 }
 473
 474                                 call.name += suffix;
 475                         }
 476                 }
 477         }
 478
 479         TraversingVisitor::visit(call);
 480 }
 481
 482 void StructuralFeatureConverter::visit(VariableDeclaration &var)
 483 {
 484         if((var.interface=="in" || var.interface=="out") && !supports_unified_interface_syntax())
 485                 if(stage->type==Stage::FRAGMENT && var.interface=="out")
 486                 {
 487                         frag_out = &var;
 488                         nodes_to_remove.insert(&var);
 489                 }
 490
 491         TraversingVisitor::visit(var);
 492 }
 493
 494 bool StructuralFeatureConverter::supports_interface_blocks(const string &iface) const
 495 {
 496         if(features.target_api==VULKAN)
 497                 return true;
 498         else if(features.target_api==OPENGL_ES)
 499         {
 500                 if(iface=="uniform")
 501                         return check_version(Version(3, 0));
 502                 else
 503                         return check_version(Version(3, 20));
 504         }
 505         else if(check_version(Version(1, 50)))
 506                 return true;
 507         else if(iface=="uniform")
 508                 return check_extension(&Features::arb_uniform_buffer_object);
 509         else
 510                 return false;
 511 }
 512
 513 void StructuralFeatureConverter::visit(InterfaceBlock &iface)
 514 {
 515         bool push_constant = false;
 516         if(iface.layout)
 517         {
 518                 auto i = find_member(iface.layout->qualifiers, string("push_constant"), &Layout::Qualifier::name);
 519                 push_constant = (i!=iface.layout->qualifiers.end());
 520         }
 521
 522         if((!supports_interface_blocks(iface.interface) || (push_constant && features.target_api!=VULKAN)) && iface.type_declaration)
 523         {
 524                 if(!iface.instance_name.empty())
 525                         unsupported("ARB_uniform_buffer_object required for interface block instances");
 526                 else if(iface.struct_declaration)
 527                 {
 528                         for(const RefPtr<Statement> &s: iface.struct_declaration->members.body)
 529                                 if(VariableDeclaration *var = dynamic_cast<VariableDeclaration *>(s.get()))
 530                                         var->interface = iface.interface;
 531                         stage->content.body.splice(uniform_insert_point, iface.struct_declaration->members.body);
 532                         nodes_to_remove.insert(&iface);
 533                         nodes_to_remove.insert(iface.struct_declaration);
 534                 }
 535                 else
 536                         /* If the interface block is an array, it should have an instance
 537                         name too, so this should never be reached */
 538                         throw logic_error("Unexpected interface block configuration");
 539         }
 540 }
 541
 542
 543 void QualifierConverter::apply()
 544 {
 545         stage->content.visit(*this);
 546 }
 547
 548 bool QualifierConverter::supports_interface_layouts() const
 549 {
 550         if(features.target_api==VULKAN)
 551                 return true;
 552         else if(features.target_api==OPENGL_ES)
 553                 return check_version(Version(3, 0));
 554         else if(check_version(Version(3, 30)))
 555                 return true;
 556         else if(check_version(Version(1, 30)))
 557                 return check_extension(&Features::arb_explicit_attrib_location);
 558         else
 559                 return false;
 560 }
 561
 562 bool QualifierConverter::supports_stage_interface_layouts() const
 563 {
 564         if(features.target_api==VULKAN)
 565                 return true;
 566         else if(features.target_api==OPENGL_ES)
 567                 return check_version(Version(3, 10));
 568         else if(check_version(Version(4, 10)))
 569                 return true;
 570         else
 571                 return check_extension(&Features::arb_separate_shader_objects);
 572 }
 573
 574 bool QualifierConverter::supports_centroid_sampling() const
 575 {
 576         if(features.target_api==VULKAN)
 577                 return true;
 578         else if(features.target_api==OPENGL_ES)
 579                 return check_version(Version(3, 0));
 580         else if(check_version(Version(1, 20)))
 581                 return true;
 582         else
 583                 return check_extension(&Features::ext_gpu_shader4);
 584 }
 585
 586 bool QualifierConverter::supports_sample_sampling() const
 587 {
 588         if(features.target_api==VULKAN)
 589                 return true;
 590         else if(features.target_api==OPENGL_ES)
 591                 return check_version(Version(3, 20));
 592         else if(check_version(Version(4, 0)))
 593                 return true;
 594         else
 595                 return check_extension(&Features::arb_gpu_shader5);
 596 }
 597
 598 bool QualifierConverter::supports_uniform_location() const
 599 {
 600         if(features.target_api==VULKAN)
 601                 return true;
 602         else if(features.target_api==OPENGL_ES)
 603                 return check_version(Version(3, 10));
 604         else if(check_version(Version(4, 30)))
 605                 return true;
 606         else
 607                 return check_extension(&Features::arb_explicit_uniform_location);
 608 }
 609
 610 bool QualifierConverter::supports_binding() const
 611 {
 612         if(features.target_api==VULKAN)
 613                 return true;
 614         else if(features.target_api==OPENGL_ES)
 615                 return check_version(Version(3, 10));
 616         else
 617                 return check_version(Version(4, 20));
 618 }
 619
 620 void QualifierConverter::visit(VariableDeclaration &var)
 621 {
 622         if(var.layout)
 623         {
 624                 for(auto i=var.layout->qualifiers.begin(); i!=var.layout->qualifiers.end(); )
 625                 {
 626                         if(i->name=="location")
 627                         {
 628                                 bool supported = true;
 629                                 bool external = false;
 630                                 if(var.interface=="in")
 631                                 {
 632                                         external = (stage->type==Stage::VERTEX);
 633                                         supported = (external ? supports_interface_layouts() : supports_stage_interface_layouts());
 634                                 }
 635                                 else if(var.interface=="out")
 636                                 {
 637                                         external = (stage->type==Stage::FRAGMENT);
 638                                         supported = (external ? supports_interface_layouts() : supports_stage_interface_layouts());
 639                                         if(external && !supported && !check_extension(&Features::ext_gpu_shader4))
 640                                         {
 641                                                 external = false;
 642                                                 if(i->value!=0)
 643                                                         unsupported("EXT_gpu_shader4 required for multiple fragment shader outputs");
 644                                         }
 645                                 }
 646                                 else if(var.interface=="uniform")
 647                                         supported = supports_uniform_location();
 648
 649                                 if(!supported)
 650                                 {
 651                                         if(external)
 652                                                 stage->locations[var.name] = i->value;
 653                                         i = var.layout->qualifiers.erase(i);
 654                                 }
 655                                 else
 656                                         ++i;
 657                         }
 658                         else if(i->name=="binding" && !supports_binding())
 659                         {
 660                                 if(dynamic_cast<const ImageTypeDeclaration *>(get_ultimate_base_type(var.type_declaration)))
 661                                         stage->texture_bindings[var.name] = i->value;
 662
 663                                 i = var.layout->qualifiers.erase(i);
 664                         }
 665                         else
 666                                 ++i;
 667                 }
 668
 669                 if(var.layout->qualifiers.empty())
 670                         var.layout = 0;
 671         }
 672
 673         if(var.sampling=="centroid")
 674         {
 675                 if(!supports_centroid_sampling())
 676                         var.sampling = string();
 677         }
 678         else if(var.sampling=="sample")
 679         {
 680                 if(!supports_sample_sampling())
 681                         var.sampling = string();
 682         }
 683
 684         if(var.name=="gl_ClipDistance")
 685                 if(const Literal *literal_size = dynamic_cast<const Literal *>(var.array_size.get()))
 686                         stage->n_clip_distances = literal_size->value.value<int>();
 687
 688         TraversingVisitor::visit(var);
 689 }
 690
 691 bool QualifierConverter::supports_interface_block_location() const
 692 {
 693         if(features.target_api==VULKAN)
 694                 return true;
 695         else if(features.target_api==OPENGL_ES)
 696                 return check_version(Version(3, 20));
 697         else if(check_version(Version(4, 40)))
 698                 return true;
 699         else
 700                 return check_extension(&Features::arb_enhanced_layouts);
 701 }
 702
 703 void QualifierConverter::visit(InterfaceBlock &iface)
 704 {
 705         if(iface.layout)
 706         {
 707                 for(auto i=iface.layout->qualifiers.begin(); i!=iface.layout->qualifiers.end(); )
 708                 {
 709                         if(i->name=="location" && !supports_interface_block_location())
 710                                 i = iface.layout->qualifiers.erase(i);
 711                         else if(i->name=="binding" && !supports_binding())
 712                         {
 713                                 stage->uniform_block_bindings[iface.block_name] = i->value;
 714                                 i = iface.layout->qualifiers.erase(i);
 715                         }
 716                         else
 717                                 ++i;
 718                 }
 719
 720                 if(iface.layout->qualifiers.empty())
 721                         iface.layout = 0;
 722         }
 723 }
 724
 725 } // namespace SL
 726 } // namespace GL
 727 } // namespace Msp