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

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• Hash : 472c74c6
  Author :
  Date : 2019-08-19T16:32:13
  

  Translator: Allow tree validation in children of TCompiler
  
  This is to be able to perform validation inside TranslatorVulkan, even
  if it's through ASSERTs.
  
  Additionally, every transformation is changed such that they do their
  validation themselves.  TIntermTraverser::updateTree() performs the
  validation, which indirectly validates many of three tree
  transformations.  Some of the more ancient transformations that don't
  use this function directly call TCompiler::validateAST.
  
  Bug: angleproject:2733
  Change-Id: Ie4af029d34e053c5ad1dc8c2c2568eecd625d344
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1761149
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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

• //
  // Copyright 2019 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.
  //
  // Implementation of dFdy viewport transformation.
  // See header for more info.
  
  #include "compiler/translator/tree_ops/RewriteDfdy.h"
  
  #include "common/angleutils.h"
  #include "compiler/translator/SymbolTable.h"
  #include "compiler/translator/tree_util/IntermNode_util.h"
  #include "compiler/translator/tree_util/IntermTraverse.h"
  
  namespace sh
  {
  
  namespace
  {
  
  class Traverser : public TIntermTraverser
  {
    public:
      ANGLE_NO_DISCARD static bool Apply(TCompiler *compiler,
                                         TIntermNode *root,
                                         const TSymbolTable &symbolTable,
                                         TIntermBinary *viewportYScale);
  
    private:
      Traverser(TIntermBinary *viewportYScale, TSymbolTable *symbolTable);
      bool visitUnary(Visit visit, TIntermUnary *node) override;
  
      TIntermBinary *mViewportYScale = nullptr;
  };
  
  Traverser::Traverser(TIntermBinary *viewportYScale, TSymbolTable *symbolTable)
      : TIntermTraverser(true, false, false, symbolTable), mViewportYScale(viewportYScale)
  {}
  
  // static
  bool Traverser::Apply(TCompiler *compiler,
                        TIntermNode *root,
                        const TSymbolTable &symbolTable,
                        TIntermBinary *viewportYScale)
  {
      TSymbolTable *pSymbolTable = const_cast<TSymbolTable *>(&symbolTable);
      Traverser traverser(viewportYScale, pSymbolTable);
      root->traverse(&traverser);
      return traverser.updateTree(compiler, root);
  }
  
  bool Traverser::visitUnary(Visit visit, TIntermUnary *node)
  {
      // Decide if the node represents a call to dFdy()
      if (node->getOp() != EOpDFdy)
      {
          return true;
      }
  
      // Copy the dFdy node so we can replace it with the corrected value
      TIntermUnary *newDfdy = node->deepCopy()->getAsUnaryNode();
  
      size_t objectSize    = node->getType().getObjectSize();
      TOperator multiplyOp = (objectSize == 1) ? EOpMul : EOpVectorTimesScalar;
  
      // Correct dFdy()'s value:
      // (dFdy() * ANGLEUniforms.viewportYScale)
      TIntermBinary *correctedDfdy =
          new TIntermBinary(multiplyOp, newDfdy, mViewportYScale->deepCopy());
  
      // Replace the old dFdy node with the new node that contains the corrected value
      queueReplacement(correctedDfdy, OriginalNode::IS_DROPPED);
  
      return true;
  }
  
  }  // anonymous namespace
  
  bool RewriteDfdy(TCompiler *compiler,
                   TIntermNode *root,
                   const TSymbolTable &symbolTable,
                   int shaderVersion,
                   TIntermBinary *viewportYScale)
  {
      // dFdy is only valid in GLSL 3.0 and later.
      if (shaderVersion < 300)
          return true;
  
      return Traverser::Apply(compiler, root, symbolTable, viewportYScale);
  }
  
  }  // namespace sh
  

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