// Copyright (c) 2021 The Khronos Group Inc.

// Copyright (c) 2021 Valve Corporation

// Copyright (c) 2021 LunarG Inc.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#ifndef SOURCE_OPT_INTERP_FIXUP_H

#define SOURCE_OPT_INTERP_FIXUP_H

#include "source/opt/ir_context.h"

#include "source/opt/module.h"

#include "source/opt/pass.h"

namespace spvtools {

namespace opt {

// Replaces overloaded internal form for GLSLstd450Interpolate* instructions

// with external form. Specifically, removes OpLoad from the first argument

// and replaces it with the pointer for the OpLoad. glslang generates the

// internal form. This pass is called as part of glslang HLSL legalization.

class InterpFixupPass : public Pass {

 public:

  const char* name() const override { return "interp-fixup"; }

  Status Process() override;

  IRContext::Analysis GetPreservedAnalyses() override {

    return IRContext::kAnalysisInstrToBlockMapping |

           IRContext::kAnalysisDecorations | IRContext::kAnalysisCombinators |

           IRContext::kAnalysisCFG | IRContext::kAnalysisDominatorAnalysis |

           IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap |

           IRContext::kAnalysisScalarEvolution |

           IRContext::kAnalysisRegisterPressure |

           IRContext::kAnalysisValueNumberTable |

           IRContext::kAnalysisStructuredCFG |

           IRContext::kAnalysisBuiltinVarId |

           IRContext::kAnalysisIdToFuncMapping | IRContext::kAnalysisTypes |

           IRContext::kAnalysisDefUse | IRContext::kAnalysisConstants;

  }

};

}  // namespace opt

}  // namespace spvtools

#endif  // SOURCE_OPT_INTERP_FIXUP_H