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#include "renderer-shared.h"
#include "source/core/slang-basic.h"
namespace gfx
{
template <typename TDevice, typename TBufferResource>
class TransientResourceHeapBaseImpl : public TransientResourceHeapBase
{
public:
void breakStrongReferenceToDevice() { m_device.breakStrongReference(); }
public:
BreakableReference<TDevice> m_device;
Slang::List<Slang::RefPtr<TBufferResource>> m_constantBuffers;
Slang::List<Slang::RefPtr<TBufferResource>> m_stagingBuffers;
Slang::Index m_constantBufferAllocCounter = 0;
size_t m_constantBufferOffsetAllocCounter = 0;
uint32_t m_alignment = 256;
Result init(const ITransientResourceHeap::Desc& desc, uint32_t alignment, TDevice* device)
{
m_device = device;
if (desc.constantBufferSize)
{
Slang::ComPtr<IBufferResource> bufferPtr;
IBufferResource::Desc bufferDesc;
bufferDesc.type = IResource::Type::Buffer;
bufferDesc.defaultState = ResourceState::ConstantBuffer;
bufferDesc.allowedStates =
ResourceStateSet(ResourceState::ConstantBuffer, ResourceState::CopyDestination);
bufferDesc.sizeInBytes = desc.constantBufferSize;
bufferDesc.memoryType = MemoryType::Upload;
SLANG_RETURN_ON_FAIL(
m_device->createBufferResource(bufferDesc, nullptr, bufferPtr.writeRef()));
m_constantBuffers.add(static_cast<TBufferResource*>(bufferPtr.get()));
}
m_version = getVersionCounter();
getVersionCounter()++;
return SLANG_OK;
}
static size_t alignUp(size_t value, uint32_t alignment)
{
return (value + alignment - 1) / alignment * alignment;
}
Result allocateStagingBuffer(size_t size, IBufferResource*& outBufferWeakPtr, ResourceState state)
{
Slang::ComPtr<IBufferResource> bufferPtr;
IBufferResource::Desc bufferDesc;
bufferDesc.type = IResource::Type::Buffer;
bufferDesc.defaultState = state;
bufferDesc.allowedStates =
ResourceStateSet(ResourceState::CopyDestination, ResourceState::CopySource);
if (state == ResourceState::CopySource)
bufferDesc.memoryType = MemoryType::Upload;
else
bufferDesc.memoryType = MemoryType::ReadBack;
bufferDesc.sizeInBytes = size;
SLANG_RETURN_ON_FAIL(
m_device->createBufferResource(bufferDesc, nullptr, bufferPtr.writeRef()));
m_stagingBuffers.add(static_cast<TBufferResource*>(bufferPtr.get()));
outBufferWeakPtr = bufferPtr.get();
return SLANG_OK;
}
Result allocateConstantBuffer(
size_t size,
IBufferResource*& outBufferWeakPtr,
size_t& outOffset)
{
size_t bufferAllocOffset = alignUp(m_constantBufferOffsetAllocCounter, m_alignment);
Slang::Index bufferId = -1;
// Find first constant buffer from `m_constantBufferAllocCounter` that has enough space
// for this allocation.
for (Slang::Index i = m_constantBufferAllocCounter; i < m_constantBuffers.getCount(); i++)
{
auto cb = m_constantBuffers[i].Ptr();
if (bufferAllocOffset + size <= cb->getDesc()->sizeInBytes)
{
bufferId = i;
break;
}
bufferAllocOffset = 0;
}
// If we cannot find an existing constant buffer with sufficient free space,
// create a new constant buffer.
if (bufferId == -1)
{
Slang::ComPtr<IBufferResource> bufferPtr;
IBufferResource::Desc bufferDesc;
bufferDesc.type = IResource::Type::Buffer;
bufferDesc.defaultState = ResourceState::ConstantBuffer;
bufferDesc.allowedStates =
ResourceStateSet(ResourceState::ConstantBuffer, ResourceState::CopyDestination);
bufferDesc.memoryType = MemoryType::Upload;
size_t lastConstantBufferSize = 0;
if (m_constantBuffers.getCount())
{
lastConstantBufferSize = m_constantBuffers.getLast()->getDesc()->sizeInBytes;
}
bufferDesc.sizeInBytes = Slang::Math::Max(
lastConstantBufferSize * 2, Slang::Math::Max(size, size_t(4 << 20)));
SLANG_RETURN_ON_FAIL(
m_device->createBufferResource(bufferDesc, nullptr, bufferPtr.writeRef()));
bufferId = m_constantBuffers.getCount();
bufferAllocOffset = 0;
m_constantBuffers.add(static_cast<TBufferResource*>(bufferPtr.get()));
}
// Sub allocate from current constant buffer.
outBufferWeakPtr = m_constantBuffers[bufferId].Ptr();
outOffset = bufferAllocOffset;
m_constantBufferAllocCounter = bufferId;
m_constantBufferOffsetAllocCounter = bufferAllocOffset + size;
return SLANG_OK;
}
void reset()
{
m_constantBufferAllocCounter = 0;
m_constantBufferOffsetAllocCounter = 0;
for (auto& stagingBuffer : m_stagingBuffers)
stagingBuffer = nullptr;
m_stagingBuffers.clear();
m_version = getVersionCounter();
getVersionCounter()++;
}
};
} // namespace gfx
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