// Copyright 2020 The Dawn & Tint Authors
//
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#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 {
    DAWN_ASSERT(IsValid());
    return mBaseDescriptor;
}

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

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

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

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

}  // namespace dawn::native::d3d12