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Align all Buffers to page boundary

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We have support for overlapping buffers which allows us to merge a lot of smaller buffers located on a single page into a single larger buffer which allows for better performance. It additionally ensures that all host buffers match the alignment guarantees of the guest and adequately fulfill host alignment requirements.
This commit is contained in:
PixelyIon 2022-03-28 13:07:53 +05:30
parent cb1ec9a7f4
commit 65d5a3bce5
1 changed files with 11 additions and 2 deletions
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13
app/src/main/cpp/skyline/gpu/buffer_manager.cpp
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@ -13,6 +13,15 @@ namespace skyline::gpu {
}
BufferView BufferManager::FindOrCreate(GuestBuffer guestMapping, const std::shared_ptr<FenceCycle> &cycle) {
/*
* We align the buffer to the page boundary to ensure that:
* 1) Any buffer view has the same alignment guarantees as on the guest, this is required for UBOs, SSBOs and Texel buffers
* 2) We can coalesce a lot of tiny buffers into a single large buffer covering an entire page, this is often the case for index buffers and vertex buffers
*/
auto alignedStart{util::AlignDown(guestMapping.begin().base(), PAGE_SIZE)}, alignedEnd{util::AlignUp(guestMapping.end().base(), PAGE_SIZE)};
vk::DeviceSize offset{static_cast<size_t>(guestMapping.begin().base() - alignedStart)}, size{guestMapping.size()};
guestMapping = span<u8>{alignedStart, alignedEnd};
std::scoped_lock lock(mutex);
// Lookup for any buffers overlapping with the supplied guest mapping
@ -26,7 +35,7 @@ namespace skyline::gpu {
if (buffer->guest.begin() <= guestMapping.begin() && buffer->guest.end() >= guestMapping.end()) {
// If we find a buffer which can entirely fit the guest mapping, we can just return a view into it
std::scoped_lock bufferLock{*buffer};
return buffer->GetView(static_cast<vk::DeviceSize>(guestMapping.begin() - buffer->guest.begin()), guestMapping.size());
return buffer->GetView(static_cast<vk::DeviceSize>(guestMapping.begin() - buffer->guest.begin()) + offset, size);
}
}
@ -70,6 +79,6 @@ namespace skyline::gpu {
buffers.insert(std::lower_bound(buffers.begin(), buffers.end(), newBuffer->guest.end().base(), BufferLessThan), newBuffer);
return newBuffer->GetView(static_cast<vk::DeviceSize>(guestMapping.begin() - newBuffer->guest.begin()), guestMapping.size());
return newBuffer->GetView(static_cast<vk::DeviceSize>(guestMapping.begin() - newBuffer->guest.begin()) + offset, size);
}
}