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;
-
-        s_GraphicsD3D12 = s_UnityInterfaces->Get<IUnityGraphicsD3D12v7>();
-        if (s_GraphicsD3D12 == nullptr)
+        switch (s_RendererType)
         {
-            UNITY_LOG_ERROR(s_Log, "Could not obtain D3D12 Graphics interface!");
-            return;
+        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;
     }
@@ -132,20 +136,21 @@ static void FreeFeatureSlot(uint32_t featureSlot)
 
 extern "C" bool UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API AMDUP_InitApi()
 {
-    if (s_GraphicsD3D12 == nullptr)
-        return false;
-
-    ID3D12Device* device = s_GraphicsD3D12->GetDevice();
-    if (device == nullptr)
-        return false;
+    if (s_GraphicsD3D12 != nullptr)
+    {
+        ID3D12Device* device = s_GraphicsD3D12->GetDevice();
+        if (device == nullptr)
+            return false;
 
-    s_Device = ffxGetDeviceDX12(device);
+        s_Device = ffxGetDeviceDX12(device);
 
-    size_t scratchBufferSize = ffxFsr2GetScratchMemorySizeDX12();
-    void* scratchBuffer = malloc(scratchBufferSize);
-    ffxFsr2GetInterfaceDX12(&s_Fsr2Interface, device, scratchBuffer, scratchBufferSize);
+        size_t scratchBufferSize = ffxFsr2GetScratchMemorySizeDX12();
+        void* scratchBuffer = malloc(scratchBufferSize);
+        ffxFsr2GetInterfaceDX12(&s_Fsr2Interface, device, scratchBuffer, scratchBufferSize);
+        return true;
+    }
 
-    return true;
+    return false;
 }
 
 extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API AMDUP_ShutdownApi()
@@ -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
@@ -255,17 +260,20 @@ static void UNITY_INTERFACE_API OnRenderEventAndData(int eventID, void* data)
 
         FfxFsr2DispatchDescription dispatchDescription{};
         
-        UnityGraphicsD3D12RecordingState state;
-        s_GraphicsD3D12->CommandRecordingState(&state);
-        dispatchDescription.commandList = ffxGetCommandListDX12(state.commandList);
-
-        dispatchDescription.color = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.colorInput);
-        dispatchDescription.depth = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.depth);
-        dispatchDescription.motionVectors = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.motionVectors);
-        dispatchDescription.exposure = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.exposureTexture);
-        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);
+        if (s_GraphicsD3D12 != nullptr)
+        {
+            UnityGraphicsD3D12RecordingState state;
+            s_GraphicsD3D12->CommandRecordingState(&state);
+            dispatchDescription.commandList = ffxGetCommandListDX12(state.commandList);
+
+            dispatchDescription.color = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.colorInput);
+            dispatchDescription.depth = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.depth);
+            dispatchDescription.motionVectors = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.motionVectors);
+            dispatchDescription.exposure = ffxGetResourceDX12(&feature.upscalingContext, (ID3D12Resource*)feature.textureTable.exposureTexture);
+            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;
     }
     }