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[dxvk] Use sparse residency for zero buffer

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Saves a small amount of memory since reading from an unbound
buffer will return zero anyway.
This commit is contained in:
Philip Rebohle 2025-03-01 12:59:44 +01:00 • committed by Philip Rebohle
parent ec0deb73da
commit 49f0968f57
1 changed files with 38 additions and 11 deletions
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49
src/dxvk/dxvk_context.cpp
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@ -7615,25 +7615,52 @@ namespace dxvk {
| VK_ACCESS_TRANSFER_READ_BIT;
bufInfo.debugName = "Zero buffer";
// If supported by the device, create a large sparse buffer and keep it unmapped
// in order to avoid having to allocate and clear any actual memory
if (m_device->features().core.features.sparseBinding
&& m_device->features().core.features.sparseResidencyBuffer
&& m_device->properties().core.properties.sparseProperties.residencyNonResidentStrict) {
bufInfo.size = align<VkDeviceSize>(size, DxvkMemoryPool::MaxChunkSize);
bufInfo.flags |= VK_BUFFER_CREATE_SPARSE_BINDING_BIT | VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT;
}
m_zeroBuffer = m_device->createBuffer(bufInfo,
VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
DxvkBufferSliceHandle slice = m_zeroBuffer->getSliceHandle();
m_cmd->cmdFillBuffer(DxvkCmdBuffer::InitBuffer,
slice.handle, slice.offset, slice.length, 0);
if (bufInfo.flags & VK_BUFFER_CREATE_SPARSE_BINDING_BIT) {
DxvkSparseBufferBindKey key = { };
key.buffer = slice.handle;
key.offset = slice.offset;
key.size = slice.length;
VkMemoryBarrier2 barrier = { VK_STRUCTURE_TYPE_MEMORY_BARRIER_2 };
barrier.srcStageMask = VK_PIPELINE_STAGE_TRANSFER_BIT;
barrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
barrier.dstStageMask = VK_PIPELINE_STAGE_TRANSFER_BIT;
barrier.dstAccessMask = VK_ACCESS_TRANSFER_READ_BIT;
DxvkResourceMemoryInfo memory = { };
memory.size = slice.length;
VkDependencyInfo depInfo = { VK_STRUCTURE_TYPE_DEPENDENCY_INFO };
depInfo.memoryBarrierCount = 1;
depInfo.pMemoryBarriers = &barrier;
// We really should have a sparse queue, but if for whatever reason we don't,
// just assume that the buffer is mapped to null by default, which seems to
// be intended by the spec anyway
if (m_device->queues().sparse.queueHandle)
m_cmd->bindBufferMemory(key, memory);
} else {
// FillBuffer is allowed even on transfer queues. Execute it on the barrier
// command buffer to ensure that subsequent transfer commands can see it.
m_cmd->cmdFillBuffer(DxvkCmdBuffer::SdmaBarriers,
slice.handle, slice.offset, slice.length, 0);
m_cmd->cmdPipelineBarrier(DxvkCmdBuffer::InitBuffer, &depInfo);
accessMemory(DxvkCmdBuffer::SdmaBarriers,
VK_PIPELINE_STAGE_2_TRANSFER_BIT, VK_ACCESS_2_TRANSFER_WRITE_BIT,
VK_PIPELINE_STAGE_2_TRANSFER_BIT, VK_ACCESS_2_TRANSFER_READ_BIT);
if (m_device->hasDedicatedTransferQueue()) {
accessMemory(DxvkCmdBuffer::InitBarriers,
VK_PIPELINE_STAGE_2_TRANSFER_BIT, VK_ACCESS_2_NONE,
VK_PIPELINE_STAGE_2_TRANSFER_BIT, VK_ACCESS_2_TRANSFER_READ_BIT);
}
}
m_cmd->track(m_zeroBuffer, DxvkAccess::Write);
return m_zeroBuffer;
}