kc3-lang/angle/src/compiler/translator/TranslatorMetalDirect/IntroduceVertexIndexID.cpp

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• Author : Kyle Piddington
  Date : 2021-04-26 16:56:15
  Hash : d7aa0130
  Message : Upstream Apple's direct-to-Metal backend: compile translator. This change is meant to merge the translator changes from Apple's direct-to-Metal backend. Taken from Kyle Piddington's CL: https://chromium-review.googlesource.com/c/angle/angle/+/2857366/ The goal of this CL is to merge the translator code in a state that compiles, but not to switch the Metal backend over to use this translator backend yet. Bug: angleproject:5505 Change-Id: I68a6354604498cd5fd1eb96c13fc56f3b38f2bd0 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2897536 Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>

• src/compiler/translator/TranslatorMetalDirect/IntroduceVertexIndexID.cpp

• //
  // Copyright 2020 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #include "compiler/translator/TranslatorMetalDirect/IntroduceVertexIndexID.h"
  #include "compiler/translator/StaticType.h"
  #include "compiler/translator/TranslatorMetalDirect/AstHelpers.h"
  #include "compiler/translator/TranslatorMetalDirect/IntermRebuild.h"
  #include "compiler/translator/tree_util/BuiltIn.h"
  using namespace sh;
  
  ////////////////////////////////////////////////////////////////////////////////
  
  namespace
  {
  
  constexpr const TVariable kgl_VertexIDMetal(BuiltInId::gl_VertexID,
                                              ImmutableString("gl_VertexID"),
                                              SymbolType::BuiltIn,
                                              TExtension::UNDEFINED,
                                              StaticType::Get<EbtUInt, EbpHigh, EvqVertexID, 1, 1>());
  
  constexpr const TVariable kgl_instanceIdMetal(
      BuiltInId::gl_VertexID,
      ImmutableString("instanceIdMod"),
      SymbolType::AngleInternal,
      TExtension::UNDEFINED,
      StaticType::Get<EbtUInt, EbpHigh, EvqInstanceID, 1, 1>());
  
  class Rewriter : public TIntermRebuild
  {
    public:
      Rewriter(TCompiler &compiler) : TIntermRebuild(compiler, true, true) {}
  
    private:
      PreResult visitFunctionDefinitionPre(TIntermFunctionDefinition &node) override
      {
          if (node.getFunction()->isMain())
          {
              const TFunction *mainFunction = node.getFunction();
              bool needsVertexId            = true;
              bool needsInstanceId          = true;
              std::vector<const TVariable *> mVariablesToIntroduce;
              for (size_t i = 0; i < mainFunction->getParamCount(); ++i)
              {
                  const TVariable *param = mainFunction->getParam(i);
                  Name instanceIDName =
                      Pipeline{Pipeline::Type::InstanceId, nullptr}.getStructInstanceName(
                          Pipeline::Variant::Modified);
                  if (Name(*param) == instanceIDName)
                  {
                      needsInstanceId = false;
                  }
                  else if (param->getType().getQualifier() == TQualifier::EvqVertexID)
                  {
                      needsVertexId = false;
                  }
              }
              if (needsInstanceId)
              {
                  mVariablesToIntroduce.push_back(&kgl_instanceIdMetal);
              }
              if (needsVertexId)
              {
                  mVariablesToIntroduce.push_back(&kgl_VertexIDMetal);
              }
              const TFunction &newFunction = CloneFunctionAndAppendParams(
                  mSymbolTable, nullptr, *node.getFunction(), mVariablesToIntroduce);
              TIntermFunctionPrototype *newProto = new TIntermFunctionPrototype(&newFunction);
              return new TIntermFunctionDefinition(newProto, node.getBody());
          }
          return node;
      }
  };
  
  }  // anonymous namespace
  
  ////////////////////////////////////////////////////////////////////////////////
  
  bool sh::IntroduceVertexAndInstanceIndex(TCompiler &compiler, TIntermBlock &root)
  {
      if (!Rewriter(compiler).rebuildRoot(root))
      {
          return false;
      }
      return true;
  }