// Copyright 2017 The NXT 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 BACKEND_SHADERMODULE_H_
#define BACKEND_SHADERMODULE_H_

#include "backend/Forward.h"
#include "backend/Builder.h"
#include "backend/RefCounted.h"
#include "common/Constants.h"

#include "nxt/nxtcpp.h"

#include <array>
#include <bitset>
#include <vector>

namespace spirv_cross {
    class Compiler;
}

namespace backend {

    class ShaderModuleBase : public RefCounted {
        public:
            ShaderModuleBase(ShaderModuleBuilder* builder);

            DeviceBase* GetDevice() const;

            void ExtractSpirvInfo(const spirv_cross::Compiler& compiler);

            struct PushConstantInfo {
                std::bitset<kMaxPushConstants> mask;

                std::array<std::string, kMaxPushConstants> names;
                std::array<uint32_t, kMaxPushConstants> sizes;
                std::array<PushConstantType, kMaxPushConstants> types;
            };

            struct BindingInfo {
                // The SPIRV ID of the resource.
                uint32_t id;
                uint32_t base_type_id;
                nxt::BindingType type;
                bool used = false;
            };
            using ModuleBindingInfo = std::array<std::array<BindingInfo, kMaxBindingsPerGroup>, kMaxBindGroups>;

            const PushConstantInfo& GetPushConstants() const;
            const ModuleBindingInfo& GetBindingInfo() const;
            const std::bitset<kMaxVertexAttributes>& GetUsedVertexAttributes() const;
            nxt::ShaderStage GetExecutionModel() const;

            bool IsCompatibleWithPipelineLayout(const PipelineLayoutBase* layout);

        private:
            bool IsCompatibleWithBindGroupLayout(size_t group, const BindGroupLayoutBase* layout);

            DeviceBase* mDevice;
            PushConstantInfo mPushConstants = {};
            ModuleBindingInfo mBindingInfo;
            std::bitset<kMaxVertexAttributes> mUsedVertexAttributes;
            nxt::ShaderStage mExecutionModel;
    };

    class ShaderModuleBuilder : public Builder<ShaderModuleBase> {
        public:
            ShaderModuleBuilder(DeviceBase* device);

            std::vector<uint32_t> AcquireSpirv();

            // NXT API
            void SetSource(uint32_t codeSize, const uint32_t* code);

        private:
            friend class ShaderModuleBase;

            ShaderModuleBase* GetResultImpl() override;

            std::vector<uint32_t> mSpirv;
    };

}

#endif // BACKEND_SHADERMODULE_H_