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display/ui: add a callback to indicate GL state is flushed

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Displaying rendered resources requires blocking qemu GPU to avoid extra
framebuffer copies. For an external display, via Spice currently, there
is a callback to block/unblock the rendering in the same thread.

But with the vhost-user-gpu backend, the qemu process doesn't handle
the rendering itself, and the blocking callback isn't effective.
Instead, the backend must be notified when the display code is done.

Fix this by adding a new GraphicHwOps callback to indicate the GL state
is flushed, and we are done manipulating the shared GL resources. Call
it from gtk and spice display.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210204105232.834642-19-marcandre.lureau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Marc-André Lureau
2021-02-04 14:52:30 +04:00
committed by Gerd Hoffmann
parent f8f3c2719e
commit 3cddb8b9e0
11 changed files with 48 additions and 10 deletions
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2
ui/sdl2-gl.c
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@@ -58,6 +58,7 @@ static void sdl2_gl_render_surface(struct sdl2_console *scon)
surface_gl_render_texture(scon->gls, scon->surface);
SDL_GL_SwapWindow(scon->real_window);
graphic_hw_gl_flushed(scon->dcl.con);
}
void sdl2_gl_update(DisplayChangeListener *dcl,
@@ -240,4 +241,5 @@ void sdl2_gl_scanout_flush(DisplayChangeListener *dcl,
egl_fb_blit(&scon->win_fb, &scon->guest_fb, !scon->y0_top);
SDL_GL_SwapWindow(scon->real_window);
graphic_hw_gl_flushed(dcl->con);
}