// Copyright 2017 The Dawn Authors
//
// 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 DAWNNATIVE_METAL_SHADERMODULEMTL_H_
#define DAWNNATIVE_METAL_SHADERMODULEMTL_H_

#include "dawn_native/ShaderModule.h"

#include "common/NSRef.h"
#include "dawn_native/Error.h"

#import <Metal/Metal.h>

namespace dawn::native::metal {

    class Device;
    class PipelineLayout;
    class RenderPipeline;

    class ShaderModule final : public ShaderModuleBase {
      public:
        static ResultOrError<Ref<ShaderModule>> Create(Device* device,
                                                       const ShaderModuleDescriptor* descriptor,
                                                       ShaderModuleParseResult* parseResult);

        struct MetalFunctionData {
            NSPRef<id<MTLFunction>> function;
            bool needsStorageBufferLength;
            std::vector<uint32_t> workgroupAllocations;
        };

        // MTLFunctionConstantValues needs @available tag to compile
        // Use id (like void*) in function signature as workaround and do static cast inside
        MaybeError CreateFunction(const char* entryPointName,
                                  SingleShaderStage stage,
                                  const PipelineLayout* layout,
                                  MetalFunctionData* out,
                                  id constantValues = nil,
                                  uint32_t sampleMask = 0xFFFFFFFF,
                                  const RenderPipeline* renderPipeline = nullptr);

      private:
        ResultOrError<std::string> TranslateToMSL(const char* entryPointName,
                                                  SingleShaderStage stage,
                                                  const PipelineLayout* layout,
                                                  uint32_t sampleMask,
                                                  const RenderPipeline* renderPipeline,
                                                  std::string* remappedEntryPointName,
                                                  bool* needsStorageBufferLength,
                                                  bool* hasInvariantAttribute,
                                                  std::vector<uint32_t>* workgroupAllocations);
        ShaderModule(Device* device, const ShaderModuleDescriptor* descriptor);
        ~ShaderModule() override = default;
        MaybeError Initialize(ShaderModuleParseResult* parseResult);
    };

}  // namespace dawn::native::metal

#endif  // DAWNNATIVE_METAL_SHADERMODULEMTL_H_