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// d3d12-resource-views.cpp
#include "d3d12-resource-views.h"
#include "d3d12-device.h"
namespace gfx
{
namespace d3d12
{
using namespace Slang;
ResourceViewInternalImpl::~ResourceViewInternalImpl()
{
if (m_descriptor.cpuHandle.ptr)
m_allocator->free(m_descriptor);
for (auto desc : m_mapBufferStrideToDescriptor)
{
m_allocator->free(desc.second);
}
}
SlangResult createD3D12BufferDescriptor(
BufferResourceImpl* buffer,
BufferResourceImpl* counterBuffer,
IResourceView::Desc const& desc,
DeviceImpl* device,
D3D12GeneralExpandingDescriptorHeap* descriptorHeap,
D3D12Descriptor* outDescriptor)
{
auto resourceImpl = (BufferResourceImpl*)buffer;
auto resourceDesc = *resourceImpl->getDesc();
const auto counterResourceImpl = static_cast<BufferResourceImpl*>(counterBuffer);
switch (desc.type)
{
default:
return SLANG_FAIL;
case IResourceView::Type::UnorderedAccess:
{
D3D12_UNORDERED_ACCESS_VIEW_DESC uavDesc = {};
uavDesc.ViewDimension = D3D12_UAV_DIMENSION_BUFFER;
uavDesc.Format = D3DUtil::getMapFormat(desc.format);
uavDesc.Buffer.FirstElement = desc.bufferRange.firstElement;
uint64_t viewSize = 0;
if (desc.bufferElementSize)
{
uavDesc.Buffer.StructureByteStride = (UINT)desc.bufferElementSize;
uavDesc.Buffer.NumElements =
desc.bufferRange.elementCount == 0
? UINT(resourceDesc.sizeInBytes / desc.bufferElementSize)
: (UINT)desc.bufferRange.elementCount;
viewSize = (uint64_t)desc.bufferElementSize * uavDesc.Buffer.NumElements;
}
else if (desc.format == Format::Unknown)
{
uavDesc.Format = DXGI_FORMAT_R32_TYPELESS;
uavDesc.Buffer.NumElements = desc.bufferRange.elementCount == 0
? UINT(resourceDesc.sizeInBytes / 4)
: UINT(desc.bufferRange.elementCount / 4);
uavDesc.Buffer.Flags |= D3D12_BUFFER_UAV_FLAG_RAW;
viewSize = 4ull * uavDesc.Buffer.NumElements;
}
else
{
FormatInfo sizeInfo;
gfxGetFormatInfo(desc.format, &sizeInfo);
assert(sizeInfo.pixelsPerBlock == 1);
uavDesc.Buffer.NumElements =
desc.bufferRange.elementCount == 0
? UINT(resourceDesc.sizeInBytes / sizeInfo.blockSizeInBytes)
: (UINT)desc.bufferRange.elementCount;
viewSize = (uint64_t)uavDesc.Buffer.NumElements * sizeInfo.blockSizeInBytes;
}
if (viewSize >= (1ull << 32) - 8)
{
// D3D12 does not support view descriptors that has size near 4GB.
// We will not create actual SRV/UAVs for such large buffers.
// However, a buffer this large can still be bound as root parameter.
// So instead of failing, we quietly ignore descriptor creation.
outDescriptor->cpuHandle.ptr = 0;
}
else
{
SLANG_RETURN_ON_FAIL(descriptorHeap->allocate(outDescriptor));
device->m_device->CreateUnorderedAccessView(
resourceImpl->m_resource,
counterResourceImpl ? counterResourceImpl->m_resource.getResource() : nullptr,
&uavDesc,
outDescriptor->cpuHandle);
}
}
break;
case IResourceView::Type::ShaderResource:
{
D3D12_SHADER_RESOURCE_VIEW_DESC srvDesc = {};
srvDesc.ViewDimension = D3D12_SRV_DIMENSION_BUFFER;
srvDesc.Format = D3DUtil::getMapFormat(desc.format);
srvDesc.Buffer.StructureByteStride = 0;
srvDesc.Buffer.FirstElement = desc.bufferRange.firstElement;
srvDesc.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
uint64_t viewSize = 0;
if (desc.bufferElementSize)
{
srvDesc.Buffer.StructureByteStride = (UINT)desc.bufferElementSize;
srvDesc.Buffer.NumElements =
desc.bufferRange.elementCount == 0
? UINT(resourceDesc.sizeInBytes / desc.bufferElementSize)
: (UINT)desc.bufferRange.elementCount;
viewSize = (uint64_t)desc.bufferElementSize * srvDesc.Buffer.NumElements;
}
else if (desc.format == Format::Unknown)
{
srvDesc.Format = DXGI_FORMAT_R32_TYPELESS;
srvDesc.Buffer.NumElements = desc.bufferRange.elementCount == 0
? UINT(resourceDesc.sizeInBytes / 4)
: UINT(desc.bufferRange.elementCount / 4);
srvDesc.Buffer.Flags |= D3D12_BUFFER_SRV_FLAG_RAW;
viewSize = 4ull * srvDesc.Buffer.NumElements;
}
else
{
FormatInfo sizeInfo;
gfxGetFormatInfo(desc.format, &sizeInfo);
assert(sizeInfo.pixelsPerBlock == 1);
srvDesc.Buffer.NumElements =
desc.bufferRange.elementCount == 0
? UINT(resourceDesc.sizeInBytes / sizeInfo.blockSizeInBytes)
: (UINT)desc.bufferRange.elementCount;
viewSize = (uint64_t)srvDesc.Buffer.NumElements * sizeInfo.blockSizeInBytes;
}
if (viewSize >= (1ull << 32) - 8)
{
// D3D12 does not support view descriptors that has size near 4GB.
// We will not create actual SRV/UAVs for such large buffers.
// However, a buffer this large can still be bound as root parameter.
// So instead of failing, we quietly ignore descriptor creation.
outDescriptor->cpuHandle.ptr = 0;
}
else
{
SLANG_RETURN_ON_FAIL(descriptorHeap->allocate(outDescriptor));
device->m_device->CreateShaderResourceView(
resourceImpl->m_resource, &srvDesc, outDescriptor->cpuHandle);
}
}
break;
}
return SLANG_OK;
}
SlangResult ResourceViewInternalImpl::getBufferDescriptorForBinding(
DeviceImpl* device,
ResourceViewImpl* view,
uint32_t bufferStride,
D3D12Descriptor& outDescriptor)
{
// If stride is 0, just use the default descriptor.
if (bufferStride == 0)
{
outDescriptor = m_descriptor;
return SLANG_OK;
}
// Otherwise, look for an existing descriptor from the cache if it exists.
if (auto descriptor = m_mapBufferStrideToDescriptor.tryGetValue(bufferStride))
{
outDescriptor = *descriptor;
return SLANG_OK;
}
// We need to create and cache a d3d12 descriptor for the resource view that encodes
// the given buffer stride.
auto bufferResImpl = static_cast<BufferResourceImpl*>(view->m_resource.get());
auto desc = view->m_desc;
uint64_t bufferSize = 0;
if (desc.bufferElementSize == 0)
{
// If buffer element size is 0, we assume the buffer range from original desc is in bytes.
bufferSize = desc.bufferRange.elementCount;
if (bufferSize == 0)
{
bufferSize = bufferResImpl->getDesc()->sizeInBytes - desc.bufferRange.firstElement;
}
desc.bufferElementSize = bufferStride;
desc.bufferRange.firstElement /= bufferStride;
desc.bufferRange.elementCount = bufferSize / bufferStride;
}
else
{
// If buffer element size is not 0, we assume the buffer range from original desc is in elements
// of original stride.
if (desc.bufferRange.elementCount == 0)
{
bufferSize = bufferResImpl->getDesc()->sizeInBytes - desc.bufferRange.firstElement * desc.bufferElementSize;
}
else
{
bufferSize = desc.bufferRange.elementCount * desc.bufferElementSize;
}
desc.bufferElementSize = bufferStride;
desc.bufferRange.firstElement = desc.bufferRange.firstElement * desc.bufferElementSize / bufferStride;
desc.bufferRange.elementCount = bufferSize / bufferStride;
}
SLANG_RETURN_ON_FAIL(createD3D12BufferDescriptor(
bufferResImpl,
static_cast<BufferResourceImpl*>(view->m_counterResource.get()),
desc,
device,
m_allocator,
&outDescriptor));
m_mapBufferStrideToDescriptor[bufferStride] = outDescriptor;
return SLANG_OK;
}
Result ResourceViewImpl::getNativeHandle(InteropHandle* outHandle)
{
outHandle->api = InteropHandleAPI::D3D12CpuDescriptorHandle;
outHandle->handleValue = m_descriptor.cpuHandle.ptr;
return SLANG_OK;
}
#if SLANG_GFX_HAS_DXR_SUPPORT
DeviceAddress AccelerationStructureImpl::getDeviceAddress()
{
return m_buffer->getDeviceAddress() + m_offset;
}
Result AccelerationStructureImpl::getNativeHandle(InteropHandle* outHandle)
{
outHandle->api = InteropHandleAPI::DeviceAddress;
outHandle->handleValue = getDeviceAddress();
return SLANG_OK;
}
#endif // SLANG_GFX_HAS_DXR_SUPPORT
} // namespace d3d12
} // namespace gfx
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