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 *type = var.type_declaration;
 214                 while(const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(type))
 215                         type = basic->base_type;
 216                 if(dynamic_cast<const ImageTypeDeclaration *>(type) && !visit_uniform(var.name, var.layout))
 217                         unbound_textures.push_back(&var);
 218         }
 219 }
 220
 221 void LocationAllocator::visit(InterfaceBlock &iface)
 222 {
 223         if(!iface.instance_name.compare(0, 3, "gl_"))
 224                 return;
 225
 226         if(iface.interface=="uniform")
 227         {
 228                 bool push_constant = false;
 229                 if(iface.layout)
 230                 {
 231                         auto i = find_member(iface.layout->qualifiers, string("push_constant"), &Layout::Qualifier::name);
 232                         push_constant = (i!=iface.layout->qualifiers.end());
 233                 }
 234
 235                 if(!push_constant && !visit_uniform(iface.block_name, iface.layout))
 236                         unbound_blocks.push_back(&iface);
 237         }
 238 }
 239
 240
 241 void PrecisionConverter::apply(Stage &s)
 242 {
 243         stage = &s;
 244         s.content.visit(*this);
 245         NodeRemover().apply(s, nodes_to_remove);
 246 }
 247
 248 void PrecisionConverter::visit(Block &block)
 249 {
 250         for(auto i=block.body.begin(); i!=block.body.end(); ++i)
 251         {
 252                 if(&block==&stage->content)
 253                         insert_point = i;
 254                 (*i)->visit(*this);
 255         }
 256 }
 257
 258 void PrecisionConverter::visit(Precision &prec)
 259 {
 260         if(stage->required_features.target_api==OPENGL_ES)
 261                 have_default.insert(prec.type);
 262         else
 263                 nodes_to_remove.insert(&prec);
 264 }
 265
 266 void PrecisionConverter::visit(VariableDeclaration &var)
 267 {
 268         if(stage->required_features.target_api!=OPENGL_ES)
 269         {
 270                 var.precision.clear();
 271                 return;
 272         }
 273
 274         const char *default_prec = (stage->type==Stage::FRAGMENT ? "mediump" : "highp");
 275         const TypeDeclaration *type = var.type_declaration;
 276         while(type)
 277         {
 278                 if(dynamic_cast<const ImageTypeDeclaration *>(type))
 279                 {
 280                         default_prec = "lowp";
 281                         break;
 282                 }
 283                 else if(const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(type))
 284                 {
 285                         if(basic->kind==BasicTypeDeclaration::INT || basic->kind==BasicTypeDeclaration::FLOAT)
 286                                 break;
 287                         type = basic->base_type;
 288                 }
 289                 else
 290                         return;
 291         }
 292         if(!type)
 293                 return;
 294
 295         if(!have_default.count(type->name))
 296         {
 297                 Precision *prec = new Precision;
 298                 prec->precision = default_prec;
 299                 prec->type = type->name;
 300                 stage->content.body.insert(insert_point, prec);
 301
 302                 have_default.insert(type->name);
 303         }
 304 }
 305
 306
 307 void FeatureConverter::apply(Stage &s, const Features &feat)
 308 {
 309         stage = &s;
 310         features = feat;
 311
 312         if(!stage->required_features.glsl_version)
 313                 stage->required_features.glsl_version = Version(1, (stage->required_features.target_api==OPENGL_ES ? 0 : 10));
 314
 315         apply();
 316 }
 317
 318 void FeatureConverter::unsupported(const string &reason)
 319 {
 320         Diagnostic diagnostic;
 321         diagnostic.severity = Diagnostic::ERR;
 322         diagnostic.source = GENERATED_SOURCE;
 323         diagnostic.line = 0;
 324         diagnostic.message = reason;
 325         stage->diagnostics.push_back(diagnostic);
 326 }
 327
 328 bool FeatureConverter::check_version(const Version &feature_version) const
 329 {
 330         if(features.glsl_version<feature_version)
 331                 return false;
 332         else if(stage->required_features.glsl_version<feature_version)
 333                 stage->required_features.glsl_version = feature_version;
 334
 335         return true;
 336 }
 337
 338 bool FeatureConverter::check_extension(bool Features::*extension) const
 339 {
 340         if(!(features.*extension))
 341                 return false;
 342
 343         stage->required_features.*extension = true;
 344
 345         return true;
 346 }
 347
 348
 349 void StructuralFeatureConverter::apply()
 350 {
 351         if(supports_stage(stage->type))
 352         {
 353                 stage->content.visit(*this);
 354                 NodeRemover().apply(*stage, nodes_to_remove);
 355         }
 356         else
 357                 unsupported(format("Stage %s is not supported", Stage::get_stage_name(stage->type)));
 358 }
 359
 360 void StructuralFeatureConverter::visit(Block &block)
 361 {
 362         for(auto i=block.body.begin(); i!=block.body.end(); ++i)
 363         {
 364                 if(&block==&stage->content)
 365                         uniform_insert_point = i;
 366                 (*i)->visit(*this);
 367         }
 368 }
 369
 370 void StructuralFeatureConverter::visit(RefPtr<Expression> &expr)
 371 {
 372         r_replaced_reference = 0;
 373         expr->visit(*this);
 374         if(r_replaced_reference)
 375                 expr = r_replaced_reference;
 376         r_replaced_reference = 0;
 377 }
 378
 379 bool StructuralFeatureConverter::supports_stage(Stage::Type st) const
 380 {
 381         if(st==Stage::GEOMETRY)
 382         {
 383                 if(features.target_api==VULKAN)
 384                         return true;
 385                 else if(features.target_api==OPENGL_ES)
 386                         return check_version(Version(3, 20));
 387                 else
 388                         return check_version(Version(1, 50));
 389         }
 390         else
 391                 return true;
 392 }
 393
 394 bool StructuralFeatureConverter::supports_unified_interface_syntax() const
 395 {
 396         if(features.target_api==VULKAN)
 397                 return true;
 398         else if(features.target_api==OPENGL_ES)
 399                 return check_version(Version(3, 0));
 400         else
 401                 return check_version(Version(1, 30));
 402 }
 403
 404 void StructuralFeatureConverter::visit(VariableReference &var)
 405 {
 406         if(var.declaration==frag_out && !supports_unified_interface_syntax())
 407         {
 408                 var.name = "gl_FragColor";
 409                 var.declaration = 0;
 410         }
 411 }
 412
 413 void StructuralFeatureConverter::visit(InterfaceBlockReference &iface)
 414 {
 415         r_flattened_interface = nodes_to_remove.count(iface.declaration);
 416 }
 417
 418 void StructuralFeatureConverter::visit(MemberAccess &memacc)
 419 {
 420         r_flattened_interface = false;
 421         visit(memacc.left);
 422         if(r_flattened_interface)
 423         {
 424                 VariableReference *var = new VariableReference;
 425                 var->name = memacc.member;
 426                 r_replaced_reference = var;
 427         }
 428 }
 429
 430 void StructuralFeatureConverter::visit(Assignment &assign)
 431 {
 432         TraversingVisitor::visit(assign);
 433         if(assign.target.declaration==frag_out && !supports_unified_interface_syntax())
 434                 assign.target.declaration = 0;
 435 }
 436
 437 bool StructuralFeatureConverter::supports_unified_sampling_functions() const
 438 {
 439         if(features.target_api==VULKAN)
 440                 return true;
 441         else if(features.target_api==OPENGL_ES)
 442                 return check_version(Version(3, 0));
 443         else
 444                 return check_version(Version(1, 30));
 445 }
 446
 447 void StructuralFeatureConverter::visit(FunctionCall &call)
 448 {
 449         if(call.declaration && call.declaration->source==BUILTIN_SOURCE)
 450         {
 451                 if(!call.name.compare(0, 7, "texture") && call.arguments.size()>=1)
 452                 {
 453                         const ImageTypeDeclaration *arg_image = dynamic_cast<const ImageTypeDeclaration *>(call.arguments.front()->type);
 454                         if(arg_image && !supports_unified_sampling_functions())
 455                         {
 456                                 string suffix = call.name.substr(7);
 457                                 call.name = (arg_image->shadow ? "shadow" : "texture");
 458
 459                                 switch(arg_image->dimensions)
 460                                 {
 461                                 case ImageTypeDeclaration::ONE: call.name += "1D"; break;
 462                                 case ImageTypeDeclaration::TWO: call.name += "2D"; break;
 463                                 case ImageTypeDeclaration::THREE: call.name += "3D"; break;
 464                                 case ImageTypeDeclaration::CUBE: call.name += "Cube"; break;
 465                                 }
 466
 467                                 if(arg_image->array)
 468                                 {
 469                                         /* Array textures and the unified sampling function name were
 470                                         both introduced in GLSL 1.30. */
 471                                         if(arg_image->dimensions==ImageTypeDeclaration::ONE || arg_image->dimensions==ImageTypeDeclaration::TWO)
 472                                                 check_extension(&Features::ext_texture_array);
 473                                         call.name += "Array";
 474                                 }
 475
 476                                 call.name += suffix;
 477                         }
 478                 }
 479         }
 480
 481         TraversingVisitor::visit(call);
 482 }
 483
 484 void StructuralFeatureConverter::visit(VariableDeclaration &var)
 485 {
 486         if((var.interface=="in" || var.interface=="out") && !supports_unified_interface_syntax())
 487                 if(stage->type==Stage::FRAGMENT && var.interface=="out")
 488                 {
 489                         frag_out = &var;
 490                         nodes_to_remove.insert(&var);
 491                 }
 492
 493         TraversingVisitor::visit(var);
 494 }
 495
 496 bool StructuralFeatureConverter::supports_interface_blocks(const string &iface) const
 497 {
 498         if(features.target_api==VULKAN)
 499                 return true;
 500         else if(features.target_api==OPENGL_ES)
 501         {
 502                 if(iface=="uniform")
 503                         return check_version(Version(3, 0));
 504                 else
 505                         return check_version(Version(3, 20));
 506         }
 507         else if(check_version(Version(1, 50)))
 508                 return true;
 509         else if(iface=="uniform")
 510                 return check_extension(&Features::arb_uniform_buffer_object);
 511         else
 512                 return false;
 513 }
 514
 515 void StructuralFeatureConverter::visit(InterfaceBlock &iface)
 516 {
 517         bool push_constant = false;
 518         if(iface.layout)
 519         {
 520                 auto i = find_member(iface.layout->qualifiers, string("push_constant"), &Layout::Qualifier::name);
 521                 push_constant = (i!=iface.layout->qualifiers.end());
 522         }
 523
 524         if((!supports_interface_blocks(iface.interface) || (push_constant && features.target_api!=VULKAN)) && iface.type_declaration)
 525         {
 526                 if(!iface.instance_name.empty())
 527                         unsupported("ARB_uniform_buffer_object required for interface block instances");
 528                 else if(iface.struct_declaration)
 529                 {
 530                         for(const RefPtr<Statement> &s: iface.struct_declaration->members.body)
 531                                 if(VariableDeclaration *var = dynamic_cast<VariableDeclaration *>(s.get()))
 532                                         var->interface = iface.interface;
 533                         stage->content.body.splice(uniform_insert_point, iface.struct_declaration->members.body);
 534                         nodes_to_remove.insert(&iface);
 535                         nodes_to_remove.insert(iface.struct_declaration);
 536                 }
 537                 else
 538                         /* If the interface block is an array, it should have an instance
 539                         name too, so this should never be reached */
 540                         throw logic_error("Unexpected interface block configuration");
 541         }
 542 }
 543
 544
 545 void QualifierConverter::apply()
 546 {
 547         stage->content.visit(*this);
 548 }
 549
 550 bool QualifierConverter::supports_interface_layouts() const
 551 {
 552         if(features.target_api==VULKAN)
 553                 return true;
 554         else if(features.target_api==OPENGL_ES)
 555                 return check_version(Version(3, 0));
 556         else if(check_version(Version(3, 30)))
 557                 return true;
 558         else if(check_version(Version(1, 30)))
 559                 return check_extension(&Features::arb_explicit_attrib_location);
 560         else
 561                 return false;
 562 }
 563
 564 bool QualifierConverter::supports_stage_interface_layouts() const
 565 {
 566         if(features.target_api==VULKAN)
 567                 return true;
 568         else if(features.target_api==OPENGL_ES)
 569                 return check_version(Version(3, 10));
 570         else if(check_version(Version(4, 10)))
 571                 return true;
 572         else
 573                 return check_extension(&Features::arb_separate_shader_objects);
 574 }
 575
 576 bool QualifierConverter::supports_centroid_sampling() const
 577 {
 578         if(features.target_api==VULKAN)
 579                 return true;
 580         else if(features.target_api==OPENGL_ES)
 581                 return check_version(Version(3, 0));
 582         else if(check_version(Version(1, 20)))
 583                 return true;
 584         else
 585                 return check_extension(&Features::ext_gpu_shader4);
 586 }
 587
 588 bool QualifierConverter::supports_sample_sampling() const
 589 {
 590         if(features.target_api==VULKAN)
 591                 return true;
 592         else if(features.target_api==OPENGL_ES)
 593                 return check_version(Version(3, 20));
 594         else if(check_version(Version(4, 0)))
 595                 return true;
 596         else
 597                 return check_extension(&Features::arb_gpu_shader5);
 598 }
 599
 600 bool QualifierConverter::supports_uniform_location() const
 601 {
 602         if(features.target_api==VULKAN)
 603                 return true;
 604         else if(features.target_api==OPENGL_ES)
 605                 return check_version(Version(3, 10));
 606         else if(check_version(Version(4, 30)))
 607                 return true;
 608         else
 609                 return check_extension(&Features::arb_explicit_uniform_location);
 610 }
 611
 612 bool QualifierConverter::supports_binding() const
 613 {
 614         if(features.target_api==VULKAN)
 615                 return true;
 616         else if(features.target_api==OPENGL_ES)
 617                 return check_version(Version(3, 10));
 618         else
 619                 return check_version(Version(4, 20));
 620 }
 621
 622 void QualifierConverter::visit(VariableDeclaration &var)
 623 {
 624         if(var.layout)
 625         {
 626                 for(auto i=var.layout->qualifiers.begin(); i!=var.layout->qualifiers.end(); )
 627                 {
 628                         if(i->name=="location")
 629                         {
 630                                 bool supported = true;
 631                                 bool external = false;
 632                                 if(var.interface=="in")
 633                                 {
 634                                         external = (stage->type==Stage::VERTEX);
 635                                         supported = (external ? supports_interface_layouts() : supports_stage_interface_layouts());
 636                                 }
 637                                 else if(var.interface=="out")
 638                                 {
 639                                         external = (stage->type==Stage::FRAGMENT);
 640                                         supported = (external ? supports_interface_layouts() : supports_stage_interface_layouts());
 641                                         if(external && !supported && !check_extension(&Features::ext_gpu_shader4))
 642                                         {
 643                                                 external = false;
 644                                                 if(i->value!=0)
 645                                                         unsupported("EXT_gpu_shader4 required for multiple fragment shader outputs");
 646                                         }
 647                                 }
 648                                 else if(var.interface=="uniform")
 649                                         supported = supports_uniform_location();
 650
 651                                 if(!supported)
 652                                 {
 653                                         if(external)
 654                                                 stage->locations[var.name] = i->value;
 655                                         i = var.layout->qualifiers.erase(i);
 656                                 }
 657                                 else
 658                                         ++i;
 659                         }
 660                         else if(i->name=="binding" && !supports_binding())
 661                         {
 662                                 const TypeDeclaration *type = var.type_declaration;
 663                                 while(const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(type))
 664                                         type = basic->base_type;
 665                                 if(dynamic_cast<const ImageTypeDeclaration *>(type))
 666                                         stage->texture_bindings[var.name] = i->value;
 667
 668                                 i = var.layout->qualifiers.erase(i);
 669                         }
 670                         else
 671                                 ++i;
 672                 }
 673
 674                 if(var.layout->qualifiers.empty())
 675                         var.layout = 0;
 676         }
 677
 678         if(var.sampling=="centroid")
 679         {
 680                 if(!supports_centroid_sampling())
 681                         var.sampling = string();
 682         }
 683         else if(var.sampling=="sample")
 684         {
 685                 if(!supports_sample_sampling())
 686                         var.sampling = string();
 687         }
 688
 689         if(var.name=="gl_ClipDistance")
 690                 if(const Literal *literal_size = dynamic_cast<const Literal *>(var.array_size.get()))
 691                         stage->n_clip_distances = literal_size->value.value<int>();
 692
 693         TraversingVisitor::visit(var);
 694 }
 695
 696 bool QualifierConverter::supports_interface_block_location() const
 697 {
 698         if(features.target_api==VULKAN)
 699                 return true;
 700         else if(features.target_api==OPENGL_ES)
 701                 return check_version(Version(3, 20));
 702         else if(check_version(Version(4, 40)))
 703                 return true;
 704         else
 705                 return check_extension(&Features::arb_enhanced_layouts);
 706 }
 707
 708 void QualifierConverter::visit(InterfaceBlock &iface)
 709 {
 710         if(iface.layout)
 711         {
 712                 for(auto i=iface.layout->qualifiers.begin(); i!=iface.layout->qualifiers.end(); )
 713                 {
 714                         if(i->name=="location" && !supports_interface_block_location())
 715                                 i = iface.layout->qualifiers.erase(i);
 716                         else if(i->name=="binding" && !supports_binding())
 717                         {
 718                                 stage->uniform_block_bindings[iface.block_name] = i->value;
 719                                 i = iface.layout->qualifiers.erase(i);
 720                         }
 721                         else
 722                                 ++i;
 723                 }
 724
 725                 if(iface.layout->qualifiers.empty())
 726                         iface.layout = 0;
 727         }
 728 }
 729
 730 } // namespace SL
 731 } // namespace GL
 732 } // namespace Msp