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#include "core/slang-basic.h"
#include "renderer-shared.h"
namespace gfx
{
template<typename TDevice, typename TBufferResource>
class StagingBufferPool
{
public:
struct StagingBufferPage
{
Slang::RefPtr<TBufferResource> resource;
size_t size;
};
struct Allocation
{
TBufferResource* resource;
size_t offset;
};
TDevice* m_device;
MemoryType m_memoryType;
uint32_t m_alignment;
ResourceStateSet m_allowedStates;
Slang::List<StagingBufferPage> m_pages;
Slang::List<Slang::RefPtr<TBufferResource>> m_largeAllocations;
Slang::Index m_pageAllocCounter = 0;
size_t m_offsetAllocCounter = 0;
const size_t kStagingBufferDefaultPageSize = 16 * 1024 * 1024;
void init(
TDevice* device,
MemoryType memoryType,
uint32_t alignment,
ResourceStateSet allowedStates)
{
m_device = device;
m_memoryType = memoryType;
m_alignment = alignment;
m_allowedStates = allowedStates;
}
static size_t alignUp(size_t value, uint32_t alignment)
{
return (value + alignment - 1) / alignment * alignment;
}
void reset()
{
m_pageAllocCounter = 0;
m_offsetAllocCounter = 0;
m_largeAllocations.clearAndDeallocate();
}
Result newStagingBufferPage()
{
StagingBufferPage page;
size_t pageSize = kStagingBufferDefaultPageSize;
Slang::ComPtr<IBufferResource> bufferPtr;
IBufferResource::Desc bufferDesc;
bufferDesc.type = IResource::Type::Buffer;
bufferDesc.defaultState = ResourceState::General;
bufferDesc.allowedStates = m_allowedStates;
bufferDesc.memoryType = m_memoryType;
bufferDesc.sizeInBytes = pageSize;
SLANG_RETURN_ON_FAIL(
m_device->createBufferResource(bufferDesc, nullptr, bufferPtr.writeRef()));
page.resource = static_cast<TBufferResource*>(bufferPtr.get());
page.size = pageSize;
m_pages.add(page);
return SLANG_OK;
}
Result newLargeBuffer(size_t size)
{
Slang::ComPtr<IBufferResource> bufferPtr;
IBufferResource::Desc bufferDesc;
bufferDesc.type = IResource::Type::Buffer;
bufferDesc.defaultState = ResourceState::General;
bufferDesc.allowedStates = m_allowedStates;
bufferDesc.memoryType = m_memoryType;
bufferDesc.sizeInBytes = size;
SLANG_RETURN_ON_FAIL(
m_device->createBufferResource(bufferDesc, nullptr, bufferPtr.writeRef()));
auto bufferImpl = static_cast<TBufferResource*>(bufferPtr.get());
m_largeAllocations.add(bufferImpl);
return SLANG_OK;
}
Allocation allocate(size_t size, bool forceLargePage)
{
if (forceLargePage || size >= (kStagingBufferDefaultPageSize >> 2))
{
newLargeBuffer(size);
Allocation result;
result.resource = m_largeAllocations.getLast();
result.offset = 0;
return result;
}
size_t bufferAllocOffset = alignUp(m_offsetAllocCounter, m_alignment);
Slang::Index bufferId = -1;
for (Slang::Index i = m_pageAllocCounter; i < m_pages.getCount(); i++)
{
auto cb = m_pages[i].resource.Ptr();
if (bufferAllocOffset + size <= cb->getDesc()->sizeInBytes)
{
bufferId = i;
break;
}
bufferAllocOffset = 0;
}
// If we cannot find an existing page with sufficient free space,
// create a new page.
if (bufferId == -1)
{
newStagingBufferPage();
bufferId = m_pages.getCount() - 1;
}
// Sub allocate from current page.
Allocation result;
result.resource = m_pages[bufferId].resource.Ptr();
result.offset = bufferAllocOffset;
m_pageAllocCounter = bufferId;
m_offsetAllocCounter = bufferAllocOffset + size;
return result;
}
};
template<typename TDevice, typename TBufferResource>
class TransientResourceHeapBaseImpl : public TransientResourceHeapBase
{
public:
void breakStrongReferenceToDevice() { m_device.breakStrongReference(); }
public:
BreakableReference<TDevice> m_device;
StagingBufferPool<TDevice, TBufferResource> m_constantBufferPool;
StagingBufferPool<TDevice, TBufferResource> m_uploadBufferPool;
StagingBufferPool<TDevice, TBufferResource> m_readbackBufferPool;
Result init(const ITransientResourceHeap::Desc& desc, uint32_t alignment, TDevice* device)
{
m_device = device;
m_constantBufferPool.init(
device,
MemoryType::Upload,
256,
ResourceStateSet(
ResourceState::ConstantBuffer,
ResourceState::CopySource,
ResourceState::CopyDestination));
m_uploadBufferPool.init(
device,
MemoryType::Upload,
256,
ResourceStateSet(ResourceState::CopySource, ResourceState::CopyDestination));
m_readbackBufferPool.init(
device,
MemoryType::ReadBack,
256,
ResourceStateSet(ResourceState::CopySource, ResourceState::CopyDestination));
m_version = getVersionCounter();
getVersionCounter()++;
return SLANG_OK;
}
Result allocateStagingBuffer(
size_t size,
IBufferResource*& outBufferWeakPtr,
size_t& offset,
MemoryType memoryType,
bool forceLargePage = false)
{
switch (memoryType)
{
case MemoryType::ReadBack:
{
auto allocation = m_readbackBufferPool.allocate(size, forceLargePage);
outBufferWeakPtr = allocation.resource;
offset = allocation.offset;
}
break;
default:
{
auto allocation = m_uploadBufferPool.allocate(size, forceLargePage);
outBufferWeakPtr = allocation.resource;
offset = allocation.offset;
}
break;
}
return SLANG_OK;
}
Result allocateConstantBuffer(
size_t size,
IBufferResource*& outBufferWeakPtr,
size_t& outOffset)
{
auto allocation = m_constantBufferPool.allocate(size, false);
outBufferWeakPtr = allocation.resource;
outOffset = allocation.offset;
return SLANG_OK;
}
void reset()
{
m_constantBufferPool.reset();
m_uploadBufferPool.reset();
m_readbackBufferPool.reset();
m_version = getVersionCounter();
getVersionCounter()++;
}
};
} // namespace gfx
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