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Wed, 04 Mar 2026 08:50:50 -0800 (PST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: Peter Xu , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , David Hildenbrand , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Markus Armbruster , Akihiko Odaki , Pierrick Bouvier , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Paolo Bonzini , Eric Blake , "Michael S. Tsirkin" , Dmitry Osipenko , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Akihiko Odaki , Pierre-Eric Pelloux-Prayer , Yiwei Zhang Subject: [PATCH 07/20] ui/sdl2: Restore original context after new context creation Date: Wed, 4 Mar 2026 16:50:29 +0000 Message-ID: <20260304165043.1437519-8-alex.bennee@linaro.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260304165043.1437519-1-alex.bennee@linaro.org> References: <20260304165043.1437519-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::632; envelope-from=alex.bennee@linaro.org; helo=mail-ej1-x632.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1772643166440154100 From: Dmitry Osipenko SDL API changes GL context to a newly created GL context, which differs from other GL providers that don't switch context. Change SDL backend to restore the original GL context. This allows Qemu's virtio-gpu to support new virglrenderer async-fencing feature for Virgl contexts, otherwise virglrenderer's vrend creates a fence-sync context on the Qemu's main-loop thread that erroneously stays in-use by the main-loop after creation, not allowing vrend's fence-sync thread switch to this new context that belongs to it. Reviewed-by: Akihiko Odaki Acked-by: Michael S. Tsirkin Tested-by: Alex Benn=C3=A9e Acked-by: Pierre-Eric Pelloux-Prayer Reviewed-by: Yiwei Zhang Signed-off-by: Dmitry Osipenko Message-ID: <20260303151422.977399-6-dmitry.osipenko@collabora.com> --- ui/sdl2-gl.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c index 5eca0248233..fbac3edbc09 100644 --- a/ui/sdl2-gl.c +++ b/ui/sdl2-gl.c @@ -139,10 +139,12 @@ QEMUGLContext sdl2_gl_create_context(DisplayGLCtx *dg= c, QEMUGLParams *params) { struct sdl2_console *scon =3D container_of(dgc, struct sdl2_console, d= gc); - SDL_GLContext ctx; + SDL_GLContext ctx, current_ctx; =20 assert(scon->opengl); =20 + current_ctx =3D SDL_GL_GetCurrentContext(); + SDL_GL_MakeCurrent(scon->real_window, scon->winctx); =20 SDL_GL_SetAttribute(SDL_GL_SHARE_WITH_CURRENT_CONTEXT, 1); @@ -167,6 +169,9 @@ QEMUGLContext sdl2_gl_create_context(DisplayGLCtx *dgc, SDL_GL_CONTEXT_PROFILE_ES); ctx =3D SDL_GL_CreateContext(scon->real_window); } + + SDL_GL_MakeCurrent(scon->real_window, current_ctx); + return (QEMUGLContext)ctx; } =20 --=20 2.47.3