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

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• Hash : 34130c2e
  Author :
  Date : 2020-11-07T15:11:14
  

  Vulkan: Rewrite interpolateAtOffset to account for Y-flip
  
  In order to fully suppot OES_shader_multisample_interpolation
  rewrite interpolateAtOffset's offset parameter to account for
  Y-coordinate flip.
  
  Bug: angleproject:3589
  Tests: dEQP-GLES31.functional.shaders.multisample_interpolation.
          interpolate_at_offset.*.default_framebuffer
  Change-Id: I6bf72ceb1c0466ff5d4a92b72d1ec9e2552d6f2a
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2524711
  Commit-Queue: Mohan Maiya <m.maiya@samsung.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/compiler/translator/tree_ops/RewriteInterpolateAtOffset.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.
  //
  // Implementation of InterpolateAtOffset viewport transformation.
  // See header for more info.
  
  #include "compiler/translator/tree_ops/RewriteDfdy.h"
  
  #include "common/angleutils.h"
  #include "compiler/translator/StaticType.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 *flipXY,
                                         TIntermTyped *fragRotation,
                                         int ShaderVersion);
  
    private:
      Traverser(TIntermBinary *flipXY,
                TIntermTyped *fragRotation,
                TSymbolTable *symbolTable,
                int shaderVersion);
      bool visitAggregate(Visit visit, TIntermAggregate *node) override;
  
      TIntermBinary *mFlipXY          = nullptr;
      TIntermTyped *mFragRotation     = nullptr;
      const TSymbolTable *symbolTable = nullptr;
      const int shaderVersion;
  };
  
  Traverser::Traverser(TIntermBinary *flipXY,
                       TIntermTyped *fragRotation,
                       TSymbolTable *symbolTable,
                       int shaderVersion)
      : TIntermTraverser(true, false, false, symbolTable),
        mFlipXY(flipXY),
        mFragRotation(fragRotation),
        symbolTable(symbolTable),
        shaderVersion(shaderVersion)
  {}
  
  // static
  bool Traverser::Apply(TCompiler *compiler,
                        TIntermNode *root,
                        const TSymbolTable &symbolTable,
                        TIntermBinary *flipXY,
                        TIntermTyped *fragRotation,
                        int shaderVersion)
  {
      TSymbolTable *pSymbolTable = const_cast<TSymbolTable *>(&symbolTable);
      Traverser traverser(flipXY, fragRotation, pSymbolTable, shaderVersion);
      root->traverse(&traverser);
      return traverser.updateTree(compiler, root);
  }
  
  bool Traverser::visitAggregate(Visit visit, TIntermAggregate *node)
  {
      // Decide if the node represents the call of texelFetchOffset.
      if (node->getOp() != EOpCallBuiltInFunction)
      {
          return true;
      }
  
      ASSERT(node->getFunction()->symbolType() == SymbolType::BuiltIn);
      if (node->getFunction()->name() != "interpolateAtOffset")
      {
          return true;
      }
  
      const TIntermSequence *sequence = node->getSequence();
      ASSERT(sequence->size() == 2u);
  
      TIntermSequence *interpolateAtOffsetArguments = new TIntermSequence();
      // interpolant node
      interpolateAtOffsetArguments->push_back(sequence->at(0));
      // offset
      TIntermTyped *offsetNode = sequence->at(1)->getAsTyped();
      ASSERT(offsetNode->getType() == *(StaticType::GetBasic<EbtFloat, 2>()));
  
      // If pre-rotation is enabled apply the transformation else just flip the Y-coordinate
      TIntermTyped *rotatedXY;
      if (mFragRotation)
      {
          rotatedXY =
              new TIntermBinary(EOpMatrixTimesVector, mFragRotation->deepCopy(), mFlipXY->deepCopy());
      }
      else
      {
          rotatedXY = mFlipXY->deepCopy();
      }
  
      TIntermBinary *correctedOffset = new TIntermBinary(EOpMul, offsetNode, rotatedXY);
      correctedOffset->setLine(offsetNode->getLine());
      interpolateAtOffsetArguments->push_back(correctedOffset);
  
      TIntermTyped *interpolateAtOffsetNode = CreateBuiltInFunctionCallNode(
          "interpolateAtOffset", interpolateAtOffsetArguments, *symbolTable, shaderVersion);
      interpolateAtOffsetNode->setLine(node->getLine());
  
      // Replace the old node by this new node.
      queueReplacement(interpolateAtOffsetNode, OriginalNode::IS_DROPPED);
  
      return true;
  }
  
  }  // anonymous namespace
  
  bool RewriteInterpolateAtOffset(TCompiler *compiler,
                                  TIntermNode *root,
                                  const TSymbolTable &symbolTable,
                                  int shaderVersion,
                                  TIntermBinary *flipXY,
                                  TIntermTyped *fragRotation)
  {
      // interpolateAtOffset is only valid in GLSL 3.0 and later.
      if (shaderVersion < 300)
      {
          return true;
      }
  
      return Traverser::Apply(compiler, root, symbolTable, flipXY, fragRotation, shaderVersion);
  }
  
  }  // namespace sh
  

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