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[idd] publish frames after copy submission

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Submit the D3D12 copy before exposing the frame through LGMP, preventing
clients from waiting on work that has not yet been queued. Track the
last published buffer separately for safe subscriber resends and handle
submission failures.
This commit is contained in:
Geoffrey McRae
2026-07-17 23:49:57 +10:00
parent 21b978e1df
commit d0bc4f3e07
3 changed files with 38 additions and 16 deletions
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32
idd/LGIdd/CIndirectDeviceContext.cpp
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@@ -820,7 +820,7 @@ bool CIndirectDeviceContext::SetupLGMP(size_t alignSize)
void CIndirectDeviceContext::DeInitLGMP()
{
m_hasFrame = false;
InterlockedExchange(&m_publishedFrameIndex, -1);
// The retry timer callback dereferences this context, so make sure it is
// stopped and drained before we tear anything down. Wait for any in-flight
@@ -910,8 +910,10 @@ void CIndirectDeviceContext::LGMPTimer()
if (lgmpHostQueueNewSubs(m_frameQueue) && m_monitor)
{
if (m_hasFrame)
lgmpHostQueuePost(m_frameQueue, 0, m_frameMemory[m_frameIndex]);
const LONG frameIndex =
InterlockedCompareExchange(&m_publishedFrameIndex, 0, 0);
if (frameIndex >= 0)
lgmpHostQueuePost(m_frameQueue, 0, m_frameMemory[frameIndex]);
}
if (lgmpHostQueueNewSubs(m_pointerQueue))
@@ -1047,15 +1049,33 @@ CIndirectDeviceContext::PreparedFrameBuffer CIndirectDeviceContext::PrepareFrame
FrameBuffer* fb = m_frameBuffer[m_frameIndex];
fb->wp = 0;
lgmpHostQueuePost(m_frameQueue, 0, m_frameMemory[m_frameIndex]);
result.frameIndex = m_frameIndex;
result.mem = fb->data;
m_hasFrame = true;
return result;
}
bool CIndirectDeviceContext::PublishFrameBuffer(unsigned frameIndex)
{
if (!m_frameQueue || frameIndex >= LGMP_Q_FRAME_LEN)
return false;
/* Make resends select this submitted frame before posting it. This prevents
* a new subscriber racing publication from receiving the previous frame
* after the new one. */
InterlockedExchange(&m_publishedFrameIndex, (LONG)frameIndex);
const LGMP_STATUS status =
lgmpHostQueuePost(m_frameQueue, 0, m_frameMemory[frameIndex]);
if (status != LGMP_OK)
{
DEBUG_ERROR("Failed to publish frame: %s", lgmpStatusString(status));
return false;
}
return true;
}
void CIndirectDeviceContext::WriteFrameBuffer(unsigned frameIndex, void* src, size_t offset, size_t len, bool setWritePos) const
{
FrameBuffer * fb = m_frameBuffer[frameIndex];