From 855f389c98787baaa8afd1139fb82e0710167d9a Mon Sep 17 00:00:00 2001
From: Gert Wollny <gert.wollny@collabora.com>
Date: Wed, 11 Sep 2024 09:14:30 +0000
Subject: [PATCH] ui/sdl2: set swap interval explicitly when OpenGL is enabled
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Before 176e3783f2ab (ui/sdl2: OpenGL window context)
SDL_CreateRenderer was called unconditionally setting
the swap interval to 0. Since SDL_CreateRenderer is now no
longer called when OpenGL is enabled, the swap interval is
no longer set explicitly and vsync handling depends on
the environment settings which may lead to a performance
regression with virgl as reported in
   https://gitlab.com/qemu-project/qemu/-/issues/2565

Restore the old vsync handling by explicitly calling
SDL_GL_SetSwapInterval if OpenGL is enabled.

Fixes: 176e3783f2ab (ui/sdl2: OpenGL window context)
Closes: https://gitlab.com/qemu-project/qemu/-/issues/2565

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <01020191e05ce6df-84da6386-62c2-4ce8-840e-ad216ac253dd-000000@eu-west-1.amazonses.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
(cherry picked from commit ae23cd00170baaa2777eb1ee87b70f472dbb3c44)
Signed-off-by: zhujun2 <zhujun2_yewu@cmss.chinamobile.com>
---
 ui/sdl2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ui/sdl2.c b/ui/sdl2.c
index 4971963f00..cc44d2708b 100644
--- a/ui/sdl2.c
+++ b/ui/sdl2.c
@@ -115,6 +115,7 @@ void sdl2_window_create(struct sdl2_console *scon)
         SDL_SetHint(SDL_HINT_RENDER_BATCHING, "1");
 
         scon->winctx = SDL_GL_CreateContext(scon->real_window);
+        SDL_GL_SetSwapInterval(0);
     } else {
         /* The SDL renderer is only used by sdl2-2D, when OpenGL is disabled */
         scon->real_renderer = SDL_CreateRenderer(scon->real_window, -1, 0);
-- 
2.41.0.windows.1