Implement ReShade addon interface

Dalamud/Interface/Internal/InterfaceManager.AsHook.cs

@@ -0,0 +1,75 @@
+using System.Diagnostics;
+
+using Dalamud.Utility;
+
+namespace Dalamud.Interface.Internal;
+
+/// <summary>
+/// This class manages interaction with the ImGui interface.
+/// </summary>
+internal partial class InterfaceManager
+{
+    private IntPtr PresentDetour(IntPtr swapChain, uint syncInterval, uint presentFlags)
+    {
+        if (!SwapChainHelper.IsGameDeviceSwapChain(swapChain))
+            return this.dxgiPresentHook!.Original(swapChain, syncInterval, presentFlags);
+
+        Debug.Assert(this.dxgiPresentHook is not null, "How did PresentDetour get called when presentHook is null?");
+        Debug.Assert(this.dalamudAtlas is not null, "dalamudAtlas should have been set already");
+
+        if (this.scene == null)
+            this.InitScene(swapChain);
+
+        Debug.Assert(this.scene is not null, "InitScene did not set the scene field, but did not throw an exception.");
+
+        if (!this.dalamudAtlas!.HasBuiltAtlas)
+        {
+            if (this.dalamudAtlas.BuildTask.Exception != null)
+            {
+                // TODO: Can we do something more user-friendly here? Unload instead?
+                Log.Error(this.dalamudAtlas.BuildTask.Exception, "Failed to initialize Dalamud base fonts");
+                Util.Fatal("Failed to initialize Dalamud base fonts.\nPlease report this error.", "Dalamud");
+            }
+
+            return this.dxgiPresentHook!.Original(swapChain, syncInterval, presentFlags);
+        }
+
+        this.CumulativePresentCalls++;
+        this.IsMainThreadInPresent = true;
+
+        while (this.runBeforeImGuiRender.TryDequeue(out var action))
+            action.InvokeSafely();
+
+        RenderImGui(this.scene!);
+        this.PostImGuiRender();
+        this.IsMainThreadInPresent = false;
+
+        return this.dxgiPresentHook!.Original(swapChain, syncInterval, presentFlags);
+    }
+
+    private IntPtr AsHookResizeBuffersDetour(
+        IntPtr swapChain, uint bufferCount, uint width, uint height, uint newFormat, uint swapChainFlags)
+    {
+        if (!SwapChainHelper.IsGameDeviceSwapChain(swapChain))
+            return this.resizeBuffersHook!.Original(swapChain, bufferCount, width, height, newFormat, swapChainFlags);
+
+#if DEBUG
+        Log.Verbose(
+            $"Calling resizebuffers swap@{swapChain.ToInt64():X}{bufferCount} {width} {height} {newFormat} {swapChainFlags}");
+#endif
+
+        this.ResizeBuffers?.InvokeSafely();
+
+        this.scene?.OnPreResize();
+
+        var ret = this.resizeBuffersHook!.Original(swapChain, bufferCount, width, height, newFormat, swapChainFlags);
+        if (ret.ToInt64() == 0x887A0001)
+        {
+            Log.Error("invalid call to resizeBuffers");
+        }
+
+        this.scene?.OnPostResize((int)width, (int)height);
+
+        return ret;
+    }
+}