src/dawn_native/d3d12/CPUDescriptorHeapAllocationD3D12.h

// Copyright 2020 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_D3D12_CPUDESCRIPTORHEAPALLOCATION_H_
#define DAWNNATIVE_D3D12_CPUDESCRIPTORHEAPALLOCATION_H_

#include <cstdint>

#include "dawn_native/d3d12/d3d12_platform.h"

namespace dawn_native { namespace d3d12 {

    // Wrapper for a handle into a CPU-only descriptor heap.
    class CPUDescriptorHeapAllocation {
      public:
        CPUDescriptorHeapAllocation() = default;
        CPUDescriptorHeapAllocation(D3D12_CPU_DESCRIPTOR_HANDLE baseDescriptor, uint32_t heapIndex);

        D3D12_CPU_DESCRIPTOR_HANDLE OffsetFrom(uint32_t sizeIncrementInBytes,
                                               uint32_t offsetInDescriptorCount) const;
        uint32_t GetHeapIndex() const;

        bool IsValid() const;

        void Invalidate();

      private:
        D3D12_CPU_DESCRIPTOR_HANDLE mBaseDescriptor = {0};
        uint32_t mHeapIndex = -1;
    };

}}  // namespace dawn_native::d3d12

#endif  // DAWNNATIVE_D3D12_CPUDESCRIPTORHEAPALLOCATION_H_