wined3d: Add a registry key to allow/disallow multisampling.

dlls/wined3d/directx.c

@@ -1775,6 +1775,12 @@ static HRESULT WINAPI IWineD3DImpl_CheckDeviceMultiSampleType(IWineD3D *iface, U
 
     if (WINED3DMULTISAMPLE_NONE == MultiSampleType) return WINED3D_OK;
 
+    /* By default multisampling is disabled right now as it causes issues
+     * on some Nvidia driver versions and it doesn't work well in combination
+     * with FBOs yet. */
+    if(!wined3d_settings.allow_multisampling)
+        return WINED3DERR_NOTAVAILABLE;
+
     desc = getFormatDescEntry(SurfaceFormat, &Adapters[Adapter].gl_info, &glDesc);
     if(!desc || !glDesc) {
         return WINED3DERR_INVALIDCALL;

dlls/wined3d/wined3d_main.c

@@ -44,7 +44,8 @@ wined3d_settings_t wined3d_settings =
     ORM_BACKBUFFER, /* Use the backbuffer to do offscreen rendering */
     RTL_AUTO,       /* Automatically determine best locking method */
     0,              /* The default of memory is set in FillGLCaps */
-    NULL            /* No wine logo by default */
+    NULL,           /* No wine logo by default */
+    FALSE           /* Disable multisampling for now due to Nvidia driver bugs which happens for some users */
 };
 
 IWineD3D* WINAPI WineDirect3DCreate(UINT SDKVersion, UINT dxVersion, IUnknown *parent) {
@@ -260,6 +261,14 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
                 wined3d_settings.logo = HeapAlloc(GetProcessHeap(), 0, strlen(buffer) + 1);
                 if(wined3d_settings.logo) strcpy(wined3d_settings.logo, buffer);
             }
+            if ( !get_config_key( hkey, appkey, "Multisampling", buffer, size) )
+            {
+                if (!strcmp(buffer,"enabled"))
+                {
+                    TRACE("Allow multisampling\n");
+                    wined3d_settings.allow_multisampling = TRUE;
+                }
+            }
        }
        if (wined3d_settings.vs_mode == VS_HW)
            TRACE("Allow HW vertex shaders\n");

dlls/wined3d/wined3d_private.h

@@ -248,6 +248,7 @@ typedef struct wined3d_settings_s {
 /* Memory tracking and object counting */
   unsigned int emulated_textureram;
   char *logo;
+  int allow_multisampling;
 } wined3d_settings_t;
 
 extern wined3d_settings_t wined3d_settings;