// Copyright 2018 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 SRC_DAWN_NATIVE_COMPUTEPASSENCODER_H_
#define SRC_DAWN_NATIVE_COMPUTEPASSENCODER_H_

#include <utility>
#include <vector>

#include "dawn/native/CommandBufferStateTracker.h"
#include "dawn/native/Error.h"
#include "dawn/native/Forward.h"
#include "dawn/native/PassResourceUsageTracker.h"
#include "dawn/native/ProgrammableEncoder.h"

namespace dawn::native {

class SyncScopeUsageTracker;

class ComputePassEncoder final : public ProgrammableEncoder {
  public:
    static Ref<ComputePassEncoder> Create(DeviceBase* device,
                                          const ComputePassDescriptor* descriptor,
                                          CommandEncoder* commandEncoder,
                                          EncodingContext* encodingContext,
                                          std::vector<TimestampWrite> timestampWritesAtEnd);
    static Ref<ComputePassEncoder> MakeError(DeviceBase* device,
                                             CommandEncoder* commandEncoder,
                                             EncodingContext* encodingContext);

    ObjectType GetType() const override;

    void APIEnd();
    void APIEndPass();  // TODO(dawn:1286): Remove after deprecation period.

    void APIDispatchWorkgroups(uint32_t workgroupCountX,
                               uint32_t workgroupCountY = 1,
                               uint32_t workgroupCountZ = 1);
    void APIDispatchWorkgroupsIndirect(BufferBase* indirectBuffer, uint64_t indirectOffset);
    void APISetPipeline(ComputePipelineBase* pipeline);

    void APISetBindGroup(uint32_t groupIndex,
                         BindGroupBase* group,
                         uint32_t dynamicOffsetCount = 0,
                         const uint32_t* dynamicOffsets = nullptr);

    void APIWriteTimestamp(QuerySetBase* querySet, uint32_t queryIndex);

    CommandBufferStateTracker* GetCommandBufferStateTrackerForTesting();
    void RestoreCommandBufferStateForTesting(CommandBufferStateTracker state) {
        RestoreCommandBufferState(std::move(state));
    }

    // Deprecated
    void APIDispatch(uint32_t workgroupCountX,
                     uint32_t workgroupCountY = 1,
                     uint32_t workgroupCountZ = 1);
    void APIDispatchIndirect(BufferBase* indirectBuffer, uint64_t indirectOffset);

  protected:
    ComputePassEncoder(DeviceBase* device,
                       const ComputePassDescriptor* descriptor,
                       CommandEncoder* commandEncoder,
                       EncodingContext* encodingContext,
                       std::vector<TimestampWrite> timestampWritesAtEnd);
    ComputePassEncoder(DeviceBase* device,
                       CommandEncoder* commandEncoder,
                       EncodingContext* encodingContext,
                       ErrorTag errorTag);

  private:
    void DestroyImpl() override;

    ResultOrError<std::pair<Ref<BufferBase>, uint64_t>> TransformIndirectDispatchBuffer(
        Ref<BufferBase> indirectBuffer,
        uint64_t indirectOffset);

    void RestoreCommandBufferState(CommandBufferStateTracker state);

    CommandBufferStateTracker mCommandBufferState;

    // Adds the bindgroups used for the current dispatch to the SyncScopeResourceUsage and
    // records it in mUsageTracker.
    void AddDispatchSyncScope(SyncScopeUsageTracker scope = {});
    ComputePassResourceUsageTracker mUsageTracker;

    // For render and compute passes, the encoding context is borrowed from the command encoder.
    // Keep a reference to the encoder to make sure the context isn't freed.
    Ref<CommandEncoder> mCommandEncoder;

    std::vector<TimestampWrite> mTimestampWritesAtEnd;
};

}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_COMPUTEPASSENCODER_H_