Isolated DX12-specific code, so that it can easily be replaced with alternative DX11 and Vulkan code.

FSR2UnityPlugin.cpp

@@ -73,15 +73,19 @@ static void UNITY_INTERFACE_API OnGraphicsDeviceEvent(UnityGfxDeviceEventType ev
     case kUnityGfxDeviceEventInitialize:
     {
         s_RendererType = s_Graphics->GetRenderer();
-        if (s_RendererType != kUnityGfxRendererD3D12)
-            return;
-
+        switch (s_RendererType)
+        {
+        case kUnityGfxRendererD3D12:
+        {
             s_GraphicsD3D12 = s_UnityInterfaces->Get<IUnityGraphicsD3D12v7>();
             if (s_GraphicsD3D12 == nullptr)
             {
                 UNITY_LOG_ERROR(s_Log, "Could not obtain D3D12 Graphics interface!");
                 return;
             }
+            break;
+        }
+        };
 
         break;
     }
@@ -132,9 +136,8 @@ static void FreeFeatureSlot(uint32_t featureSlot)
 
 extern "C" bool UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API AMDUP_InitApi()
 {
-    if (s_GraphicsD3D12 == nullptr)
-        return false;
-
+    if (s_GraphicsD3D12 != nullptr)
+    {
         ID3D12Device* device = s_GraphicsD3D12->GetDevice();
         if (device == nullptr)
             return false;
@@ -144,10 +147,12 @@ extern "C" bool UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API AMDUP_InitApi()
         size_t scratchBufferSize = ffxFsr2GetScratchMemorySizeDX12();
         void* scratchBuffer = malloc(scratchBufferSize);
         ffxFsr2GetInterfaceDX12(&s_Fsr2Interface, device, scratchBuffer, scratchBufferSize);
-
         return true;
     }
 
+    return false;
+}
+
 extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API AMDUP_ShutdownApi()
 {
     for (uint32_t slot = 0; slot < s_Features.size(); ++slot)
@@ -225,7 +230,7 @@ extern "C" int32_t UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API AMDUP_GetBaseEvent
 // Plugin function to handle a specific rendering event
 static void UNITY_INTERFACE_API OnRenderEventAndData(int eventID, void* data)
 {
-    if (s_GraphicsD3D12 == nullptr || s_Device == nullptr)
+    if (s_Device == nullptr)
         return;
 
     // User rendering code
@@ -255,6 +260,8 @@ static void UNITY_INTERFACE_API OnRenderEventAndData(int eventID, void* data)
 
         FfxFsr2DispatchDescription dispatchDescription{};
         
+        if (s_GraphicsD3D12 != nullptr)
+        {
             UnityGraphicsD3D12RecordingState state;
             s_GraphicsD3D12->CommandRecordingState(&state);
             dispatchDescription.commandList = ffxGetCommandListDX12(state.commandList);
@@ -266,6 +273,7 @@ static void UNITY_INTERFACE_API OnRenderEventAndData(int eventID, void* data)
             dispatchDescription.reactive = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.reactiveMask);
             dispatchDescription.transparencyAndComposition = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.transparencyMask);
             dispatchDescription.output = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.colorOutput, nullptr, FFX_RESOURCE_STATE_UNORDERED_ACCESS);
+        }
 
         dispatchDescription.jitterOffset.x = params->jitterOffsetX;
         dispatchDescription.jitterOffset.y = params->jitterOffsetY;
@@ -323,9 +331,6 @@ static void UNITY_INTERFACE_API OnRenderEventAndData(int eventID, void* data)
 
 static void UNITY_INTERFACE_API OnSetTextureEvent(int eventID, void* data)
 {
-    if (s_GraphicsD3D12 == nullptr)
-        return;
-
     auto* params = (UnityRenderingExtTextureUpdateParamsV2*)data;
 
     // userData = (featureId & (int) ushort.MaxValue) << 16 | (textureSlot & (int) short.MaxValue) << 1 | (clearTextureTable ? 1 : 0);
@@ -351,9 +356,15 @@ static void UNITY_INTERFACE_API OnSetTextureEvent(int eventID, void* data)
     }
     case kUnityRenderingExtEventUpdateTextureEndV2:
     {
+        intptr_t texturePtr = 0;
+        if (s_GraphicsD3D12 != nullptr)
+        {
+            texturePtr = (intptr_t)s_GraphicsD3D12->TextureFromNativeTexture((UnityTextureID)params->textureID);
+        }
+
         // We organized the texture table struct to be ordered the same as the texture slot enum
         // This way we can use the texture slot value simply as a pointer offset into the texture table
-        *(((intptr_t*)&feature.textureTable) + textureSlot) = (intptr_t)s_GraphicsD3D12->TextureFromNativeTexture((UnityTextureID)params->textureID);
+        *(((intptr_t*)&feature.textureTable) + textureSlot) = texturePtr;
         break;
     }
     }