// 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.

#include "dawn/native/d3d12/CPUDescriptorHeapAllocationD3D12.h"
#include "dawn/native/Error.h"

namespace dawn::native::d3d12 {

CPUDescriptorHeapAllocation::CPUDescriptorHeapAllocation(D3D12_CPU_DESCRIPTOR_HANDLE baseDescriptor,
                                                         uint32_t heapIndex)
    : mBaseDescriptor(baseDescriptor), mHeapIndex(heapIndex) {}

D3D12_CPU_DESCRIPTOR_HANDLE CPUDescriptorHeapAllocation::GetBaseDescriptor() const {
    ASSERT(IsValid());
    return mBaseDescriptor;
}

D3D12_CPU_DESCRIPTOR_HANDLE CPUDescriptorHeapAllocation::OffsetFrom(
    uint32_t sizeIncrementInBytes,
    uint32_t offsetInDescriptorCount) const {
    ASSERT(IsValid());
    D3D12_CPU_DESCRIPTOR_HANDLE cpuHandle = mBaseDescriptor;
    cpuHandle.ptr += sizeIncrementInBytes * offsetInDescriptorCount;
    return cpuHandle;
}

uint32_t CPUDescriptorHeapAllocation::GetHeapIndex() const {
    ASSERT(mHeapIndex >= 0);
    return mHeapIndex;
}

bool CPUDescriptorHeapAllocation::IsValid() const {
    return mBaseDescriptor.ptr != 0;
}

void CPUDescriptorHeapAllocation::Invalidate() {
    mBaseDescriptor = {0};
}

}  // namespace dawn::native::d3d12