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Tsirkin" , Paolo Bonzini , Yiwei Zhang , Sergio Lopez Pascual Cc: Gert Wollny , qemu-devel@nongnu.org, Gurchetan Singh , Alyssa Ross , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Alex Deucher , Stefano Stabellini , =?UTF-8?q?Christian=20K=C3=B6nig?= , Xenia Ragiadakou , Honglei Huang , Julia Zhang , Chen Jiqian , Rob Clark , Robert Beckett Subject: [PATCH v20 05/21] ui/sdl2: Restore original context after new context creation Date: Sun, 1 Mar 2026 23:48:22 +0300 Message-ID: <20260301204838.596994-6-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260301204838.596994-1-dmitry.osipenko@collabora.com> References: <20260301204838.596994-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External 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=136.143.188.112; envelope-from=dmitry.osipenko@collabora.com; helo=sender4-pp-f112.zoho.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.012, RCVD_IN_VALIDITY_RPBL_BLOCKED=1.188, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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 dmitry.osipenko@collabora.com) X-ZM-MESSAGEID: 1772398274622158500 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 --- 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 5eca0248233e..fbac3edbc09d 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 2.52.0