wined3d: Fallback to our private window when context activation fails otherwise.

dlls/wined3d/context.c

@@ -795,15 +795,62 @@ static BOOL context_set_pixel_format(const struct wined3d_gl_info *gl_info, HDC
 
 static BOOL context_set_gl_context(struct wined3d_context *ctx)
 {
+    struct wined3d_swapchain *swapchain = ctx->swapchain;
+
     if (!pwglMakeCurrent(ctx->hdc, ctx->glCtx))
     {
         WARN("Failed to make GL context %p current on device context %p, last error %#x.\n",
                 ctx->glCtx, ctx->hdc, GetLastError());
         ctx->valid = 0;
-        context_set_current(NULL);
-        return FALSE;
+        WARN("Trying fallback to the backup window.\n");
+
+        if (!swapchain->backup_dc)
+        {
+            TRACE("Creating the backup window for swapchain %p.\n", swapchain);
+            swapchain->backup_wnd = CreateWindowA(WINED3D_OPENGL_WINDOW_CLASS_NAME, "WineD3D fake window",
+                    WS_OVERLAPPEDWINDOW, 10, 10, 10, 10, NULL, NULL, NULL, NULL);
+            if (!swapchain->backup_wnd)
+            {
+                ERR("Failed to create a window.\n");
+                goto fail;
+            }
+            swapchain->backup_dc = GetDC(swapchain->backup_wnd);
+            if (!swapchain->backup_dc)
+            {
+                ERR("Failed to get a DC.\n");
+                goto fail;
+            }
+            if (!context_set_pixel_format(ctx->gl_info, swapchain->backup_dc, ctx->pixel_format))
+            {
+                ERR("Failed to set pixel format %d on device context %p.\n",
+                        ctx->pixel_format, swapchain->backup_dc);
+                goto fail;
+            }
+        }
+
+        if (!pwglMakeCurrent(swapchain->backup_dc, ctx->glCtx))
+        {
+            ERR("Fallback to backup window (dc %p) failed too, last error %#x.\n",
+                    swapchain->backup_dc, GetLastError());
+            context_set_current(NULL);
+            return FALSE;
+        }
     }
     return TRUE;
+
+fail:
+    if (swapchain->backup_dc)
+    {
+        ReleaseDC(swapchain->backup_wnd, swapchain->backup_dc);
+        swapchain->backup_dc = NULL;
+    }
+    if (swapchain->backup_wnd)
+    {
+        DestroyWindow(swapchain->backup_wnd);
+        swapchain->backup_wnd = NULL;
+    }
+    context_set_current(NULL);
+    return FALSE;
 }
 
 static void context_restore_gl_context(HDC dc, HGLRC gl_ctx)

dlls/wined3d/swapchain.c

@@ -80,6 +80,14 @@ static void swapchain_cleanup(struct wined3d_swapchain *swapchain)
         mode.Format = swapchain->orig_fmt;
         IWineD3DDevice_SetDisplayMode((IWineD3DDevice *)swapchain->device, 0, &mode);
     }
+
+    if (swapchain->backup_dc)
+    {
+        TRACE("Destroying backup wined3d window %p, dc %p.\n", swapchain->backup_wnd, swapchain->backup_dc);
+
+        ReleaseDC(swapchain->backup_wnd, swapchain->backup_dc);
+        DestroyWindow(swapchain->backup_wnd);
+    }
 }
 
 ULONG CDECL wined3d_swapchain_incref(struct wined3d_swapchain *swapchain)

dlls/wined3d/wined3d_private.h

@@ -2543,6 +2543,9 @@ struct wined3d_swapchain
 
     HWND win_handle;
     HWND device_window;
+
+    HDC backup_dc;
+    HWND backup_wnd;
 };
 
 void x11_copy_to_screen(struct wined3d_swapchain *swapchain, const RECT *rect) DECLSPEC_HIDDEN;