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graphics: retain oversized readbacks through GPU completion

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Co-authored-by: Mac <me@itsmemac.com>
This commit is contained in:
nmzik
2026-09-29 21:28:16 +04:00
parent da9b38af2b
commit 18a5f04d05
2 changed files with 61 additions and 54 deletions
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src/graphics/host_gpu/renderer/cache/bufferCache.cpp
Vendored
+12 -7
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@@ -129,11 +129,16 @@ bool BufferCache::DownloadBufferMemory(Buffer& buffer, uint64_t vaddr, uint64_t
return false;
}
const auto [mapped, offset] = m_download_buffer.Map(total_size, 64);
auto [mapped, offset] = m_download_buffer.Map(total_size, 64);
std::unique_ptr<Buffer> temporary;
if (mapped == nullptr) {
EXIT("BufferCache: download exceeds 64 MiB staging buffer capacity\n");
temporary = std::make_unique<Buffer>(m_graphics, m_scheduler, MemoryUsage::Download, 0,
vk::BufferUsageFlagBits::eTransferDst, total_size);
mapped = temporary->Mapped().data();
} else {
m_download_buffer.Commit();
}
m_download_buffer.Commit();
const auto& download = temporary ? *temporary : m_download_buffer;
for (auto& copy: copies) {
copy.dstOffset += offset;
}
@@ -152,13 +157,13 @@ bool BufferCache::DownloadBufferMemory(Buffer& buffer, uint64_t vaddr, uint64_t
native.pipelineBarrier(vk::PipelineStageFlagBits::eAllCommands,
vk::PipelineStageFlagBits::eTransfer, {}, 0, nullptr, 1, &before, 0,
nullptr);
native.copyBuffer(buffer.Handle(), m_download_buffer.Handle(),
native.copyBuffer(buffer.Handle(), download.Handle(),
static_cast<uint32_t>(copies.size()), copies.data());
auto after = before;
after.srcAccessMask = vk::AccessFlagBits::eTransferWrite;
after.dstAccessMask = vk::AccessFlagBits::eHostRead;
after.buffer = m_download_buffer.Handle();
after.buffer = download.Handle();
after.offset = offset;
after.size = total_size;
native.pipelineBarrier(vk::PipelineStageFlagBits::eTransfer,
@@ -166,8 +171,8 @@ bool BufferCache::DownloadBufferMemory(Buffer& buffer, uint64_t vaddr, uint64_t
vk::PipelineStageFlagBits::eHost,
{}, 0, nullptr, 1, &after, 0, nullptr);
m_scheduler.DeferPriorityOperation([this, mapped, offset, total_size, buffer_address,
copies = std::move(copies)] {
m_download_buffer.Invalidate(offset, total_size);
copies = std::move(copies), owner = std::move(temporary)] {
(owner ? *owner : m_download_buffer).Invalidate(offset, total_size);
for (const auto& copy: copies) {
Libs::LibKernel::Memory::WriteBacking(buffer_address + copy.srcOffset,
mapped + (copy.dstOffset - offset), copy.size);