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renderer: eliminate extra copy for small streaming buffers

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This commit is contained in:
nmzik
2026-08-02 08:34:44 +02:00
parent f831e60412
commit da0d33224d
1 changed files with 15 additions and 3 deletions
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src/graphics/host_gpu/renderer/cache/bufferCache.cpp
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+15 -3
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@@ -612,9 +612,21 @@ BufferBinding BufferCache::ObtainBuffer(CommandBuffer& command, uint64_t vaddr,
if (is_read && !is_written && size <= CACHING_PAGE_SIZE &&
!m_memory_tracker.IsRegionGpuModified(vaddr, size) &&
m_memory_tracker.IsRegionCpuModified(vaddr, size)) {
std::vector<uint8_t> data(size);
if (Libs::LibKernel::Memory::TryReadBacking(vaddr, data.data(), size)) {
return UploadTransient(data.data(), size, 16);
const auto alignment = std::max<uint64_t>(
m_graphics.physical_device_properties.limits.minUniformBufferOffsetAlignment, 1);
if (auto [mapped, offset] = m_stream_buffer.Map(size, alignment, false);
mapped != nullptr) {
if (Libs::LibKernel::Memory::TryReadBacking(vaddr, mapped, size)) {
m_stream_buffer.Commit();
return {{}, m_stream_buffer.Handle(), offset};
}
} else {
auto owner = std::make_shared<Buffer>(m_graphics, m_scheduler, MemoryUsage::Upload, 0,
AllFlags, size);
if (Libs::LibKernel::Memory::TryReadBacking(vaddr, owner->Mapped().data(), size)) {
owner->Flush(0, size);
return {owner, owner->Handle(), 0};
}
}
}