kc3-lang/angle/src/compiler/translator/tree_ops/RemoveInvariantDeclaration.cpp

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• Author : Shahbaz Youssefi
  Date : 2021-01-19 12:48:15
  Hash : 9f4b159b
  Message : Translator: Avoid vector copies with multi-replacement Turns push_backs into emplace_backs and changes the TIntermSequence constructor argument to &&. Bug: angleproject:5535 Change-Id: I640ce879b6ade48a28dea6385ebb7a95cb8304ff Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2636680 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>

• src/compiler/translator/tree_ops/RemoveInvariantDeclaration.cpp

• //
  // Copyright 2016 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/tree_ops/RemoveInvariantDeclaration.h"
  
  #include "compiler/translator/tree_util/IntermTraverse.h"
  
  namespace sh
  {
  
  namespace
  {
  
  // An AST traverser that removes invariant declaration for input in fragment shader
  // when GLSL >= 4.20 and for output in vertex shader when GLSL < 4.2.
  class RemoveInvariantDeclarationTraverser : public TIntermTraverser
  {
    public:
      RemoveInvariantDeclarationTraverser() : TIntermTraverser(true, false, false) {}
  
    private:
      bool visitGlobalQualifierDeclaration(Visit visit,
                                           TIntermGlobalQualifierDeclaration *node) override
      {
          if (node->isInvariant())
          {
              TIntermSequence emptyReplacement;
              mMultiReplacements.emplace_back(getParentNode()->getAsBlock(), node,
                                              std::move(emptyReplacement));
          }
          return false;
      }
  };
  
  }  // anonymous namespace
  
  bool RemoveInvariantDeclaration(TCompiler *compiler, TIntermNode *root)
  {
      RemoveInvariantDeclarationTraverser traverser;
      root->traverse(&traverser);
      return traverser.updateTree(compiler, root);
  }
  
  }  // namespace sh