Add option to block nvapi

renderdoc/driver/ihv/nv/nvapi_hooks.cpp

@@ -25,6 +25,7 @@
 #include <unordered_map>
 #include "common/formatting.h"
 #include "core/core.h"
+#include "core/settings.h"
 #include "driver/d3d11/d3d11_hooks.h"
 #include "hooks/hooks.h"
 #include "nvapi_wrapper.h"
@@ -34,6 +35,9 @@
 
 #include "official/nvapi/nvapi.h"
 
+RDOC_CONFIG(bool, NV_BlockNVAPI, false,
+            "Completely block nvapi from activating, pretend no NV GPU is present");
+
 namespace
 {
 #include "official/nvapi/nvapi_interface.h"
@@ -503,6 +507,9 @@ private:
 
   static NvAPI_Status __cdecl NvAPI_Initialize_hook()
   {
+    if(NV_BlockNVAPI())
+      return NVAPI_NVIDIA_DEVICE_NOT_FOUND;
+
     NvAPI_Status ret = nvhooks.NvAPI_Initialize()();
 
     if(ret == NVAPI_OK)