From 81f6ccb1bec0b22fb871d09a63beeb1f37e65c09 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Tue, 23 Apr 2019 16:51:50 +0200
Subject: [PATCH] [d3d11] Select sync event based on back buffer count
May improve frame pacing in some games.
---
src/d3d11/d3d11_device.cpp | 6 +++++-
src/d3d11/d3d11_device.h | 3 ++-
src/d3d11/d3d11_swapchain.cpp | 2 +-
3 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/src/d3d11/d3d11_device.cpp b/src/d3d11/d3d11_device.cpp
index 5bfffbde3..34dc50aa0 100644
--- a/src/d3d11/d3d11_device.cpp
+++ b/src/d3d11/d3d11_device.cpp
@@ -1985,8 +1985,12 @@ namespace dxvk {
}
- Rc<DxvkEvent> STDMETHODCALLTYPE D3D11DXGIDevice::GetFrameSyncEvent() {
+ Rc<DxvkEvent> STDMETHODCALLTYPE D3D11DXGIDevice::GetFrameSyncEvent(UINT BufferCount) {
uint32_t frameLatency = m_frameLatency;
+
+ if (BufferCount != 0
+ && BufferCount <= frameLatency)
+ frameLatency = BufferCount;
if (m_frameLatencyCap != 0
&& m_frameLatencyCap <= frameLatency)
diff --git a/src/d3d11/d3d11_device.h b/src/d3d11/d3d11_device.h
index a8e2df400..62643f651 100644
--- a/src/d3d11/d3d11_device.h
+++ b/src/d3d11/d3d11_device.h
@@ -500,7 +500,8 @@ namespace dxvk {
void STDMETHODCALLTYPE Trim() final;
- Rc<DxvkEvent> STDMETHODCALLTYPE GetFrameSyncEvent();
+ Rc<DxvkEvent> STDMETHODCALLTYPE GetFrameSyncEvent(
+ UINT BufferCount);
Rc<DxvkDevice> STDMETHODCALLTYPE GetDXVKDevice();
diff --git a/src/d3d11/d3d11_swapchain.cpp b/src/d3d11/d3d11_swapchain.cpp
index b74f30ce6..5b9177340 100644
--- a/src/d3d11/d3d11_swapchain.cpp
+++ b/src/d3d11/d3d11_swapchain.cpp
@@ -200,7 +200,7 @@ namespace dxvk {
void D3D11SwapChain::PresentImage(UINT SyncInterval) {
// Wait for the sync event so that we
// respect the maximum frame latency
- Rc<DxvkEvent> syncEvent = m_dxgiDevice->GetFrameSyncEvent();
+ Rc<DxvkEvent> syncEvent = m_dxgiDevice->GetFrameSyncEvent(m_desc.BufferCount);
syncEvent->wait();
if (m_hud != nullptr)