From 0632da19357fb3d846ea36ef07166eb93b09173a Mon Sep 17 00:00:00 2001
From: WinterSnowfall <WinterSnowfall@users.noreply.github.com>
Date: Tue, 19 Sep 2023 17:54:03 +0300
Subject: [d3d9] Add a device compatibility mode for d3d8

---
 src/d3d9/d3d9_bridge.cpp     |  6 +++++-
 src/d3d9/d3d9_bridge.h       |  8 ++++++++
 src/d3d9/d3d9_device.cpp     |  6 ++++--
 src/d3d9/d3d9_device.h       | 18 +++++++++++++++---
 src/d3d9/d3d9_stateblock.cpp |  5 +++--
 5 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/src/d3d9/d3d9_bridge.cpp b/src/d3d9/d3d9_bridge.cpp
index 88448ba9..6bb4801a 100644
--- a/src/d3d9/d3d9_bridge.cpp
+++ b/src/d3d9/d3d9_bridge.cpp
@@ -32,6 +32,10 @@ namespace dxvk {
     m_device->m_implicitSwapchain->SetApiName(name);
   }
 
+  void DxvkD3D8Bridge::SetD3D8CompatibilityMode(const bool compatMode) {
+    m_device->SetD3D8CompatibilityMode(compatMode);
+  }
+
   HRESULT DxvkD3D8Bridge::UpdateTextureFromBuffer(
         IDirect3DSurface9*  pDestSurface,
         IDirect3DSurface9*  pSrcSurface,
@@ -104,4 +108,4 @@ namespace dxvk {
   const Config* DxvkD3D8InterfaceBridge::GetConfig() const {
     return &m_interface->GetInstance()->config();
   }
-}
\ No newline at end of file
+}
diff --git a/src/d3d9/d3d9_bridge.h b/src/d3d9/d3d9_bridge.h
index f1c12104..163d4130 100644
--- a/src/d3d9/d3d9_bridge.h
+++ b/src/d3d9/d3d9_bridge.h
@@ -30,6 +30,13 @@ IDxvkD3D8Bridge : public IUnknown {
    */
   virtual void SetAPIName(const char* name) = 0;
 
+  /**
+   * \brief Enables or disables D3D9-specific device features and validations
+   * 
+   * \param [in] compatibility state
+   */
+  virtual void SetD3D8CompatibilityMode(const bool compatMode) = 0;
+
   /**
    * \brief Updates a D3D9 surface from a D3D9 buffer
    * 
@@ -83,6 +90,7 @@ namespace dxvk {
             void** ppvObject);
 
     void SetAPIName(const char* name);
+    void SetD3D8CompatibilityMode(const bool compatMode);
 
     HRESULT UpdateTextureFromBuffer(
         IDirect3DSurface9*        pDestSurface,
diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index 7c14efa1..a2f6e9c3 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -2360,7 +2360,8 @@ namespace dxvk {
     try {
       const Com<D3D9StateBlock> sb = new D3D9StateBlock(this, ConvertStateBlockType(Type));
       *ppSB = sb.ref();
-      m_losableResourceCounter++;
+      if (!m_isD3D8Compatible)
+        m_losableResourceCounter++;
 
       return D3D_OK;
     }
@@ -2392,7 +2393,8 @@ namespace dxvk {
       return D3DERR_INVALIDCALL;
 
     *ppSB = m_recorder.ref();
-    m_losableResourceCounter++;
+    if (!m_isD3D8Compatible)
+      m_losableResourceCounter++;
     m_recorder = nullptr;
 
     return D3D_OK;
diff --git a/src/d3d9/d3d9_device.h b/src/d3d9/d3d9_device.h
index 8b979106..b4a29285 100644
--- a/src/d3d9/d3d9_device.h
+++ b/src/d3d9/d3d9_device.h
@@ -970,6 +970,17 @@ namespace dxvk {
     void TouchMappedTexture(D3D9CommonTexture* pTexture);
     void RemoveMappedTexture(D3D9CommonTexture* pTexture);
 
+    bool IsD3D8Compatible() const {
+      return m_isD3D8Compatible;
+    }
+
+    void SetD3D8CompatibilityMode(bool compatMode) {
+      if (compatMode)
+        Logger::info("The D3D9 device is now operating in D3D8 compatibility mode.");
+
+      m_isD3D8Compatible = compatMode;
+    }
+
     // Device Lost
     bool IsDeviceLost() const {
       return m_deviceLostState != D3D9DeviceLostState::Ok;
@@ -1318,9 +1329,10 @@ namespace dxvk {
     D3D9ShaderMasks                 m_psShaderMasks = FixedFunctionMask;
 
     bool                            m_isSWVP;
-    bool                            m_amdATOC         = false;
-    bool                            m_nvATOC          = false;
-    bool                            m_ffZTest         = false;
+    bool                            m_isD3D8Compatible = false;
+    bool                            m_amdATOC          = false;
+    bool                            m_nvATOC           = false;
+    bool                            m_ffZTest          = false;
     
     VkImageLayout                   m_hazardLayout = VK_IMAGE_LAYOUT_GENERAL;
 
diff --git a/src/d3d9/d3d9_stateblock.cpp b/src/d3d9/d3d9_stateblock.cpp
index 9bb7181b..0d5bacd9 100644
--- a/src/d3d9/d3d9_stateblock.cpp
+++ b/src/d3d9/d3d9_stateblock.cpp
@@ -18,7 +18,8 @@ namespace dxvk {
   }
 
   D3D9StateBlock::~D3D9StateBlock() {
-    m_parent->DecrementLosableCounter();
+    if (!m_parent->IsD3D8Compatible())
+      m_parent->DecrementLosableCounter();
   }
 
   HRESULT STDMETHODCALLTYPE D3D9StateBlock::QueryInterface(
@@ -575,4 +576,4 @@ namespace dxvk {
       this->Capture();
   }
 
-}
\ No newline at end of file
+}
-- 
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