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ui/sdl2: Restore original context after new context creation

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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 <akihiko.odaki@daynix.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Yiwei Zhang <zzyiwei@gmail.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Message-ID: <20260303151422.977399-6-dmitry.osipenko@collabora.com>
Message-ID: <20260304165043.1437519-8-alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Dmitry Osipenko
2026-03-04 16:50:29 +00:00
committed by Alex Bennée
parent 47ab600668
commit 2b0e2edc83
1 changed files with 6 additions and 1 deletions
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7
ui/sdl2-gl.c
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@@ -139,10 +139,12 @@ QEMUGLContext sdl2_gl_create_context(DisplayGLCtx *dgc,
QEMUGLParams *params)
{
struct sdl2_console *scon = container_of(dgc, struct sdl2_console, dgc);
SDL_GLContext ctx;
SDL_GLContext ctx, current_ctx;
assert(scon->opengl);
current_ctx = SDL_GL_GetCurrentContext();
SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
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 = SDL_GL_CreateContext(scon->real_window);
}
SDL_GL_MakeCurrent(scon->real_window, current_ctx);
return (QEMUGLContext)ctx;
}