From f92c6ae8598904d4ccf1828fb1ecfb67b939f6ec Mon Sep 17 00:00:00 2001
From: Liam Middlebrook <lmiddlebrook@nvidia.com>
Date: Tue, 15 Mar 2022 16:08:29 -0700
Subject: [PATCH] [dxgi] Add DXVK_ENABLE_NVAPI envvar

Add a new environment variable DXVK_ENABLE_NVAPI as an environment-level
override for 'nvapiHack'. This will allow for DLSS (and other
NvAPI-backed features) to be available without the user manually writing
a configuration file, allowing for more seamless integration with
Proton's launch script.
---
 src/dxgi/dxgi_options.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/dxgi/dxgi_options.cpp b/src/dxgi/dxgi_options.cpp
index 19d4e7a52..469692d19 100644
--- a/src/dxgi/dxgi_options.cpp
+++ b/src/dxgi/dxgi_options.cpp
@@ -40,7 +40,11 @@ namespace dxvk {
     this->maxDeviceMemory = VkDeviceSize(config.getOption<int32_t>("dxgi.maxDeviceMemory", 0)) << 20;
     this->maxSharedMemory = VkDeviceSize(config.getOption<int32_t>("dxgi.maxSharedMemory", 0)) << 20;
 
-    this->nvapiHack   = config.getOption<bool>("dxgi.nvapiHack", true);
+    // Force nvapiHack to be disabled if NvAPI is enabled in environment
+    if (env::getEnvVar("DXVK_ENABLE_NVAPI") == "1")
+      this->nvapiHack = false;
+    else
+      this->nvapiHack = config.getOption<bool>("dxgi.nvapiHack", true);
   }
   
-}
\ No newline at end of file
+}