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#include "d3d12-descriptor-heap.h"
namespace gfx
{
using namespace Slang;
D3D12DescriptorHeap::D3D12DescriptorHeap()
: m_totalSize(0), m_currentIndex(0), m_descriptorSize(0)
{
}
Result D3D12DescriptorHeap::init(
ID3D12Device* device,
int size,
D3D12_DESCRIPTOR_HEAP_TYPE type,
D3D12_DESCRIPTOR_HEAP_FLAGS flags)
{
m_device = device;
D3D12_DESCRIPTOR_HEAP_DESC srvHeapDesc = {};
srvHeapDesc.NumDescriptors = size;
srvHeapDesc.Flags = flags;
srvHeapDesc.Type = type;
SLANG_RETURN_ON_FAIL(
device->CreateDescriptorHeap(&srvHeapDesc, IID_PPV_ARGS(m_heap.writeRef())));
m_descriptorSize = device->GetDescriptorHandleIncrementSize(type);
m_totalSize = size;
m_heapFlags = flags;
return SLANG_OK;
}
Result D3D12DescriptorHeap::init(
ID3D12Device* device,
const D3D12_CPU_DESCRIPTOR_HANDLE* handles,
int numHandles,
D3D12_DESCRIPTOR_HEAP_TYPE type,
D3D12_DESCRIPTOR_HEAP_FLAGS flags)
{
SLANG_RETURN_ON_FAIL(init(device, numHandles, type, flags));
D3D12_CPU_DESCRIPTOR_HANDLE dst = m_heap->GetCPUDescriptorHandleForHeapStart();
// Copy them all
for (int i = 0; i < numHandles; i++, dst.ptr += m_descriptorSize)
{
D3D12_CPU_DESCRIPTOR_HANDLE src = handles[i];
if (src.ptr != 0)
{
device->CopyDescriptorsSimple(1, dst, src, type);
}
}
return SLANG_OK;
}
} // namespace gfx
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