private GpuResource AllocateCommitted(GpuResourceDesc desc, D3D12_RESOURCE_ALLOCATION_INFO allocInfo)
{
using var device = _device.Copy();
var heapProperties = GetHeapProperties(desc);
var clearVal = desc.ClearValue.GetValueOrDefault();
using ComPtr <ID3D12Resource> resource = default;
Guard.ThrowIfFailed(device.Get()->CreateCommittedResource(
&heapProperties,
desc.HeapFlags,
&desc.ResourceFormat.D3D12ResourceDesc,
desc.InitialState,
desc.ClearValue is null ? null : &clearVal,
resource.Guid,
ComPtr.GetVoidAddressOf(&resource)
));
return(new GpuResource(
resource.Move(),
desc,
allocInfo.SizeInBytes,
0,
private void VerifyDesc(GpuResourceDesc desc)
{
var flags = desc.AllocFlags;
if (flags.HasFlag(GpuAllocFlags.ForceAllocateComitted))
{
Debug.Assert(!flags.HasFlag(GpuAllocFlags.ForceAllocateNotComitted));
}
else if (flags.HasFlag(GpuAllocFlags.ForceAllocateNotComitted))
{
Debug.Assert(!flags.HasFlag(GpuAllocFlags.ForceAllocateComitted));
}
}
/// <summary>
/// Allocates a new region of GPU memory
/// </summary>
/// <param name="desc">The description for the resource to allocate</param>
/// <returns>A new <see cref="GpuResource"/> which encapsulates the allocated region</returns>
public GpuResource Allocate(
GpuResourceDesc desc
)
{
VerifyDesc(desc);
var info = GetAllocationInfo(desc);
if (desc.AllocFlags.HasFlag(GpuAllocFlags.ForceAllocateComitted))
{
return(AllocateCommitted(desc, info));
}
return(AllocatePlacedFromHeap(desc, info));
}
/// <summary>
/// Allocates a new <see cref="IndexBuffer{TIndex}"/>
/// </summary>
/// <typeparam name="TIndex">The type of each index</typeparam>
/// <param name="indexCount">The number of indices</param>
/// <param name="type">The type of GPU memory to allocate in</param>
/// <param name="flags">Any additional allocation flags passed to the allocator</param>
/// <returns>A new <see cref="IndexBuffer{TIndex}"/></returns>
public IndexBuffer <TIndex> AllocateIndexBuffer <TIndex>(
uint indexCount,
GpuMemoryType type,
GpuAllocFlags flags = GpuAllocFlags.None
) where TIndex : unmanaged
{
Debug.Assert(type != GpuMemoryType.CpuReadOptimized);
var desc = new GpuResourceDesc(
GpuResourceFormat.Buffer((uint)sizeof(TIndex) * indexCount),
type,
type == GpuMemoryType.CpuWriteOptimized ? D3D12_RESOURCE_STATE_GENERIC_READ : D3D12_RESOURCE_STATE_INDEX_BUFFER,
flags
);
return(new IndexBuffer <TIndex>(Allocate(desc)));
}
internal GpuResource(
ComPtr <ID3D12Resource> resource,
GpuResourceDesc desc,
ulong size,
ulong offset,
AllocatorHeap heap,
GpuAllocator allocator
)
{
_value = resource.Move();
State = desc.InitialState;
ResourceFormat = desc.Format;
Type = desc.GpuMemoryType;
_size = size;
_offset = offset;
_heap = heap;
_allocator = allocator;
GpuAddress = UnderlyingResource->GetGPUVirtualAddress();
}
private D3D12_RESOURCE_ALLOCATION_INFO GetAllocationInfo(GpuResourceDesc desc)
{
// TODO use ID3D12Device4::GetResourceAllocationInfo1 for doing all our computations in one go
return(_device.Get()->GetResourceAllocationInfo(0 /* TODO: MULTI-GPU */, 1, &desc.ResourceFormat.D3D12ResourceDesc));
}