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mediafoundation: Prefetch the slice fence handles before the waits

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Reviewed-by: Pohsiang (John) Hsu <pohhsu@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40805>
This commit is contained in:
Silvio Vilerino 2026-04-03 11:23:04 -04:00 • committed by Marge Bot
parent f0ae58df12
commit 3467763ab5
1 changed files with 13 additions and 6 deletions
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19
src/gallium/frontends/mediafoundation/mftransform.cpp
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@ -1644,6 +1644,18 @@ CDX12EncHMFT::xThreadProc( void *pCtx )
pThis->m_pPipeContext->screen, pDX12EncodeContext->pLastSliceFence ) );
assert(lastSliceFenceEvent);
// Pre-create all slice fence events to avoid per-iteration
// CreateEvent+SetEventOnCompletion kernel round-trips
// and so we don't wait between each WaitForMultipleObjects to create the next event
std::vector<std::unique_ptr<void, HandleCloser>> sliceFenceEvents;
sliceFenceEvents.reserve( num_slice_buffers );
for( uint32_t i = 0; i < num_slice_buffers; i++ )
{
sliceFenceEvents.emplace_back( pThis->m_pPipeContext->screen->fence_get_win32_event(
pThis->m_pPipeContext->screen, pDX12EncodeContext->pSliceFences[i] ) );
assert( sliceFenceEvents[i] );
}
for( uint32_t slice_idx = 0; slice_idx < num_slice_buffers; slice_idx++ )
{
// Wait for the current slice fence to complete, using pLastSliceFence as a short-circuit.
@ -1657,12 +1669,7 @@ CDX12EncHMFT::xThreadProc( void *pCtx )
// Use WaitForMultipleObjects to block until either fence signals
//
std::unique_ptr<void, HandleCloser> sliceFenceEvent(
pThis->m_pPipeContext->screen->fence_get_win32_event(
pThis->m_pPipeContext->screen, pDX12EncodeContext->pSliceFences[slice_idx] ) );
assert(sliceFenceEvent);
HANDLE fenceEvents[2] = { sliceFenceEvent.get(), lastSliceFenceEvent.get() };
HANDLE fenceEvents[2] = { sliceFenceEvents[slice_idx].get(), lastSliceFenceEvent.get() };
DWORD waitResult = WaitForMultipleObjects( 2, fenceEvents, FALSE /* bWaitAll */, INFINITE );
if( waitResult == WAIT_OBJECT_0 + 0 /* slice fence signaled */ )