[Qemu-commits] [qemu/qemu] 213c10: ui/sdl2: set swap interval explicitly when OpenGL ...

[Gert Wollny]

  Branch: refs/heads/staging-8.2
  Home:   https://github.com/qemu/qemu
  Commit: 213c10e895c77d64abc16f6d226e271f48f0f806
      
https://github.com/qemu/qemu/commit/213c10e895c77d64abc16f6d226e271f48f0f806
  Author: Gert Wollny <gert.wollny@collabora.com>
  Date:   2024-09-16 (Mon, 16 Sep 2024)

  Changed paths:
    M ui/sdl2.c

  Log Message:
  -----------
  ui/sdl2: set swap interval explicitly when OpenGL is enabled

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: Michael Tokarev <mjt@tls.msk.ru>



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