From fd555203011f8f5792b17fe17be39076fc126095 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Fri, 20 Jul 2018 11:39:51 +0200
Subject: [PATCH] [dxgi] Implement IDXGIDevice::SetMaximumFrameLatency

We'll be doing the CPU synchronization with DXVK events during
presentation.
---
 src/dxgi/dxgi_device.cpp | 22 +++++++++++++++++++---
 src/dxgi/dxgi_device.h   |  9 ++++++++-
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/src/dxgi/dxgi_device.cpp b/src/dxgi/dxgi_device.cpp
index 28a0ba15..dfba4b9d 100644
--- a/src/dxgi/dxgi_device.cpp
+++ b/src/dxgi/dxgi_device.cpp
@@ -2,6 +2,8 @@
 #include "dxgi_factory.h"
 
 namespace dxvk {
+
+  constexpr uint32_t DxgiDevice::DefaultFrameLatency;
   
   DxgiDevice::DxgiDevice(
           IDXGIObject*              pContainer,
@@ -10,6 +12,9 @@ namespace dxvk {
   : m_container (pContainer),
     m_adapter   (pAdapter) {
     m_device = m_adapter->GetDXVKAdapter()->createDevice(*pFeatures);
+
+    for (uint32_t i = 0; i < m_frameEvents.size(); i++)
+      m_frameEvents[i] = new DxvkEvent();
   }
   
   
@@ -107,15 +112,20 @@ namespace dxvk {
   
   HRESULT STDMETHODCALLTYPE DxgiDevice::GetMaximumFrameLatency(
           UINT*                 pMaxLatency) {
-    Logger::warn("DxgiDevice::GetMaximumFrameLatency: Stub");
-    *pMaxLatency = 1;
+    *pMaxLatency = m_frameLatency;
     return S_OK;
   }
   
   
   HRESULT STDMETHODCALLTYPE DxgiDevice::SetMaximumFrameLatency(
           UINT                  MaxLatency) {
-    Logger::warn("DxgiDevice::SetMaximumFrameLatency: Stub");
+    if (MaxLatency == 0)
+      MaxLatency = DefaultFrameLatency;
+    
+    if (MaxLatency > m_frameEvents.size())
+      MaxLatency = m_frameEvents.size();
+    
+    m_frameLatency = MaxLatency;
     return S_OK;
   }
   
@@ -149,4 +159,10 @@ namespace dxvk {
     return m_device;
   }
   
+  
+  Rc<DxvkEvent> STDMETHODCALLTYPE DxgiDevice::GetFrameSyncEvent() {
+    uint32_t frameId = m_frameId++ % m_frameLatency;
+    return m_frameEvents[frameId];
+  }
+  
 }
diff --git a/src/dxgi/dxgi_device.h b/src/dxgi/dxgi_device.h
index d1dcf61c..54114a06 100644
--- a/src/dxgi/dxgi_device.h
+++ b/src/dxgi/dxgi_device.h
@@ -10,7 +10,7 @@ namespace dxvk {
   class DxgiFactory;
   
   class DxgiDevice : public IDXGIVkDevice {
-    
+    constexpr static uint32_t DefaultFrameLatency = 3;
   public:
     
     DxgiDevice(
@@ -86,6 +86,8 @@ namespace dxvk {
             HANDLE                hEvent) final;
     
     Rc<DxvkDevice> STDMETHODCALLTYPE GetDXVKDevice() final;
+
+    Rc<DxvkEvent> STDMETHODCALLTYPE GetFrameSyncEvent();
     
   private:
     
@@ -93,6 +95,11 @@ namespace dxvk {
     
     Com<IDXGIVkAdapter> m_adapter;
     Rc<DxvkDevice>      m_device;
+
+    uint32_t            m_frameLatency = DefaultFrameLatency;
+    uint32_t            m_frameId      = 0;
+
+    std::array<Rc<DxvkEvent>, 16> m_frameEvents;
     
   };