kc3-lang/angle/src/compiler/translator/tree_ops/spirv/ReswizzleYUVOps.cpp

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• Hash : 47c66901
  Author :
  Date : 2024-10-21T12:47:22
  

  Vulkan: Set gl_Layer to 0 if the framebuffer is not layered
  
  Bug: angleproject:372390039
  Change-Id: I29067c9488e06f6dd2e90f207fecb843267fb77c
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5949263
  Reviewed-by: Charlie Lao <cclao@google.com>
  Reviewed-by: Yuxin Hu <yuxinhu@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/compiler/translator/tree_ops/spirv/ReswizzleYUVOps.cpp

• //
  // Copyright 2023 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.
  //
  // ReswizzleYUVOps: Adjusts swizzles for YUV channel order difference between
  //   GLES and Vulkan
  //
  //
  
  #include "compiler/translator/tree_ops/spirv/EmulateYUVBuiltIns.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"
  #include "compiler/translator/tree_util/RunAtTheEndOfShader.h"
  
  namespace sh
  {
  namespace
  {
  // A traverser that adjusts channel order for various yuv ops.
  class ReswizzleYUVOpsTraverser : public TIntermTraverser
  {
    public:
      ReswizzleYUVOpsTraverser(TSymbolTable *symbolTable)
          : TIntermTraverser(true, false, false, symbolTable)
      {}
  
      bool visitAggregate(Visit visit, TIntermAggregate *node) override;
      bool visitSwizzle(Visit visit, TIntermSwizzle *node) override;
      bool adjustOutput(TCompiler *compiler, TIntermBlock *root, const TIntermSymbol &yuvOutput);
  
    private:
  };
  
  // OpenGLES and Vulkan has different color component mapping for YUV. OpenGL spec maps R_gl=y,
  // G_gl=u, B_gl=v, but Vulkan wants R_vulkan=v, G_vulkan=y, B_vulkan=u. We want all calculation to
  // be in OpenGLES mapping during shader execution, but the actual buffer/image will be stored as
  // vulkan mapping. This means when we sample from VkImage, we need to map from vulkan order back to
  // GL order, which comes out to be R_gl=y=G_vulkan=1, G_gl=u=B_vulkan=2, B_gl=v=R_vulkan=0. i.e, {1,
  // 2, 0, 3}. This function will check if the aggregate is a texture{proj|fetch}(samplerExternal,...)
  // and if yes it will compose and return a swizzle node.
  TIntermSwizzle *CheckTextureOpWithSamplerExternal2DY2YAndSwizzle(Visit visit,
                                                                   TIntermAggregate *node)
  {
      if (visit != Visit::PreVisit)
      {
          return nullptr;
      }
  
      if (!BuiltInGroup::IsBuiltIn(node->getOp()))
      {
          return nullptr;
      }
  
      TOperator op = node->getFunction()->getBuiltInOp();
      if (op == EOpTexture || op == EOpTextureProj || op == EOpTexelFetch)
      {
          TIntermSequence *arguments = node->getSequence();
          TType const &samplerType   = (*arguments)[0]->getAsTyped()->getType();
          if (samplerType.getBasicType() != EbtSamplerExternal2DY2YEXT)
          {
              return nullptr;
          }
  
          // texture(...).gbra
          TIntermSwizzle *yuvSwizzle = new TIntermSwizzle(node, {1, 2, 0, 3});
          return yuvSwizzle;
      }
  
      return nullptr;
  }
  
  bool ReswizzleYUVOpsTraverser::visitAggregate(Visit visit, TIntermAggregate *node)
  {
      TIntermSwizzle *yuvSwizzle = CheckTextureOpWithSamplerExternal2DY2YAndSwizzle(visit, node);
      if (yuvSwizzle != nullptr)
      {
          ASSERT(!getParentNode()->getAsSwizzleNode());
          queueReplacement(yuvSwizzle, OriginalNode::BECOMES_CHILD);
          return false;
      }
  
      return true;
  }
  
  bool ReswizzleYUVOpsTraverser::visitSwizzle(Visit visit, TIntermSwizzle *node)
  {
      TIntermAggregate *aggregate = node->getOperand()->getAsAggregate();
      if (aggregate == nullptr)
      {
          return true;
      }
  
      // There is swizzle on YUV texture sampler, and we need to apply YUV swizzle first and
      // then followed by the original swizzle. Finally we fold the two swizzles into one.
      TIntermSwizzle *yuvSwizzle = CheckTextureOpWithSamplerExternal2DY2YAndSwizzle(visit, aggregate);
      if (yuvSwizzle != nullptr)
      {
          TIntermTyped *replacement = new TIntermSwizzle(yuvSwizzle, node->getSwizzleOffsets());
          replacement               = replacement->fold(nullptr);
          queueReplacement(replacement, OriginalNode::IS_DROPPED);
          return false;
      }
  
      return true;
  }
  
  // OpenGLES and Vulkan has different color component mapping for YUV. When we write YUV data, we
  // need to convert OpenGL mapping to vulkan's mapping, which comes out to be {2, 0, 1, 3}.
  bool ReswizzleYUVOpsTraverser::adjustOutput(TCompiler *compiler,
                                              TIntermBlock *root,
                                              const TIntermSymbol &yuvOutput)
  {
      TIntermBlock *block = new TIntermBlock;
  
      // output = output.brga
      TVector<int> swizzle = {2, 0, 1, 3};
      const int size       = yuvOutput.getType().getNominalSize();
      if (size < 4)
      {
          swizzle.resize(size);
      }
  
      TIntermTyped *assignment = new TIntermBinary(EOpAssign, yuvOutput.deepCopy(),
                                                   new TIntermSwizzle(yuvOutput.deepCopy(), swizzle));
      block->appendStatement(assignment);
  
      return RunAtTheEndOfShader(compiler, root, block, mSymbolTable);
  }
  }  // anonymous namespace
  
  bool ReswizzleYUVOps(TCompiler *compiler,
                       TIntermBlock *root,
                       TSymbolTable *symbolTable,
                       const TIntermSymbol *yuvOutput)
  {
      ReswizzleYUVOpsTraverser traverser(symbolTable);
      root->traverse(&traverser);
  
      if (!traverser.updateTree(compiler, root))
      {
          return false;
      }
  
      if (yuvOutput != nullptr && !traverser.adjustOutput(compiler, root, *yuvOutput))
      {
          return false;
      }
      return true;
  }
  }  // namespace sh
  

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