[PATCH 0/1] MR8698: Draft: winemac: Ensure OpenGL backbuffer size is updated when emulated display mode changes.

[Brendan Shanks (＠bshanks)]

@rbernon, I could use some advice on this.

I believe this has been broken since 31b9d0c0cc67b3a03340c33f0e9942bee94c431b--unfortunately I don't have a standalone test app for it, but when display mode emulation is enabled, games like Half-Life 2 display correctly on launch but do not display correctly after the (full)screen resolution is changed in-game.

The fix here does work, but it's maybe not correct to call `make_context_current()` in the `client_surface_update`? I found that in the case of the view position check in `macdrv_client_surface_update`, win32u calls `make_context_current` afterwards. This isn't the case when the DPI has changed though, requiring that explicit `make_context_current` call.
Also previously this check was done in `macdrv_swap_buffers` and it could be done now in `macdrv_surface_swap`, but it seems preferable to do things in `update` rather than `swap` if possible.

And !8504 changes all of this, where should it go in that case?

[PATCH 1/1] winemac: Ensure OpenGL backbuffer size is updated when emulated display mode changes.

[Brendan Shanks]

From: Brendan Shanks

---
 dlls/winemac.drv/opengl.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/dlls/winemac.drv/opengl.c b/dlls/winemac.drv/opengl.c
index 172b0d60226..1fff143ac29 100644
--- a/dlls/winemac.drv/opengl.c
+++ b/dlls/winemac.drv/opengl.c
@@ -2953,6 +2953,27 @@ static void macdrv_client_surface_update(struct client_surface *client)
     {
         TRACE("GL view %p changed position; marking contexts\n", data->client_cocoa_view);
         mark_contexts_for_moved_view(data->client_cocoa_view);
+
+	{
+	    struct macdrv_context *context;
+
+	    pthread_mutex_lock(&context_mutex);
+	    LIST_FOR_EACH_ENTRY(context, &context_list, struct macdrv_context, entry)
+	    {
+		if (context->draw_view == data->client_cocoa_view)
+		{
+			RECT rect;
+			NtUserGetClientRect(context->draw_hwnd, &rect, NtUserGetDpiForWindow(context->draw_hwnd));
+			if (!EqualRect(&context->draw_rect_win_dpi, &rect))
+			{
+				ERR("GL view %p context %p rect %s -> %s\n", data->client_cocoa_view, context, wine_dbgstr_rect(&context->draw_rect_win_dpi), wine_dbgstr_rect(&rect));
+				    //context->draw_rect_win_dpi = rect;
+				make_context_current(context, FALSE);
+			}
+		}
+	    }
+	    pthread_mutex_unlock(&context_mutex);
+	}
     }

release_win_data(data);

[Rémi Bernon (＠rbernon)]

Hmm... I'm not seeing any issue with wglgears and `wine control desk.cpl` virtual resolution changes, so I'm not sure what needs to be done.

Nevertheless, I added a https://gitlab.winehq.org/wine/wine/-/merge_requests/8504/diffs?commit_id=db... and https://gitlab.winehq.org/wine/wine/-/merge_requests/8504/diffs?commit_id=0e... to !8504 which I believe could be doing what you want?

[Brendan Shanks (＠bshanks)]

On Mon Aug  4 19:04:39 2025 +0000, Rémi Bernon wrote:
> Hmm... I'm not seeing any issue with wglgears and `wine control
> desk.cpl` virtual resolution changes, so I'm not sure what needs to be done.
> Nevertheless, I added a
> https://gitlab.winehq.org/wine/wine/-/merge_requests/8504/diffs?commit_id=db...
> and
> https://gitlab.winehq.org/wine/wine/-/merge_requests/8504/diffs?commit_id=0e...
> to !8504 which I believe could be doing what you want?

Thanks, tested with Half-Life 2 + wined3d and those commits fix the issue.

[PATCH 0/1] MR8698: Draft: winemac: Ensure OpenGL backbuffer size is updated when emulated display mode changes. - closed

[Brendan Shanks (＠bshanks)]

This merge request was closed by Brendan Shanks.