// Copyright (c) 2022 The Khronos Group Inc.

// Copyright (c) 2022 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.

#include "source/opt/analyze_live_input_pass.h"

#include "source/opt/ir_context.h"

namespace spvtools {

namespace opt {

Pass::Status AnalyzeLiveInputPass::Process() {

  // Current functionality assumes shader capability

  if (!context()->get_feature_mgr()->HasCapability(spv::Capability::Shader))

    return Status::SuccessWithoutChange;

  Pass::Status status = DoLiveInputAnalysis();

  return status;

}

Pass::Status AnalyzeLiveInputPass::DoLiveInputAnalysis() {

  // Current functionality only supports frag, tesc, tese or geom shaders.

  // Report failure for any other stage.

  auto stage = context()->GetStage();

  if (stage != spv::ExecutionModel::Fragment &&

      stage != spv::ExecutionModel::TessellationControl &&

      stage != spv::ExecutionModel::TessellationEvaluation &&

      stage != spv::ExecutionModel::Geometry)

    return Status::Failure;

  context()->get_liveness_mgr()->GetLiveness(live_locs_, live_builtins_);

  return Status::SuccessWithoutChange;

}

}  // namespace opt

}  // namespace spvtools