From 5d49644cdc071866c5556997a35bd946d7724457 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Thu, 1 Nov 2018 13:47:04 +0100
Subject: [PATCH] [dxgi] Hack: Report Nvidia cards as AMD cards by default

Prevents UE4 games from repeatedly trying to load nvapi.dll
on a performance-critical code path.
---
 src/dxgi/dxgi_adapter.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/dxgi/dxgi_adapter.cpp b/src/dxgi/dxgi_adapter.cpp
index 10a6215b5..84e2ee1db 100644
--- a/src/dxgi/dxgi_adapter.cpp
+++ b/src/dxgi/dxgi_adapter.cpp
@@ -158,6 +158,14 @@ namespace dxvk {
     if (options->customDeviceId >= 0)
       deviceProp.deviceID = options->customDeviceId;
     
+    // XXX nvapi workaround for a lot of Unreal Engine 4 games
+    if (options->customVendorId < 0 && options->customDeviceId < 0
+     && deviceProp.vendorID == uint16_t(DxvkGpuVendor::Nvidia)) {
+      Logger::info("DXGI: NvAPI workaround enabled, reporting AMD GPU");
+      deviceProp.vendorID = uint16_t(DxvkGpuVendor::Amd);
+      deviceProp.deviceID = 0x67df; /* RX 480 */
+    }
+    
     // Convert device name
     std::memset(pDesc->Description, 0, sizeof(pDesc->Description));
     ::MultiByteToWideChar(CP_UTF8, 0, deviceProp.deviceName, -1,