ui/dbus: fix texture sharing

The DBus listener naively create, update and destroy textures without
taking into account other listeners. The texture were shared, but
texture update was unnecessarily duplicated.

Teach DisplayGLCtx to do optionally shared texture handling. This is
only implemented for DBus display at this point, however the same
infrastructure could potentially be used for other future combinations.

Reported-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

include/ui/console.h

@@ -290,10 +290,20 @@ typedef struct DisplayGLCtxOps {
                                QEMUGLContext ctx);
     int (*dpy_gl_ctx_make_current)(DisplayGLCtx *dgc,
                                    QEMUGLContext ctx);
+    void (*dpy_gl_ctx_create_texture)(DisplayGLCtx *dgc,
+                                      DisplaySurface *surface);
+    void (*dpy_gl_ctx_destroy_texture)(DisplayGLCtx *dgc,
+                                      DisplaySurface *surface);
+    void (*dpy_gl_ctx_update_texture)(DisplayGLCtx *dgc,
+                                      DisplaySurface *surface,
+                                      int x, int y, int w, int h);
 } DisplayGLCtxOps;
 
 struct DisplayGLCtx {
     const DisplayGLCtxOps *ops;
+#ifdef CONFIG_OPENGL
+    QemuGLShader *gls; /* optional shared shader */
+#endif
 };
 
 DisplayState *init_displaystate(void);

ui/console.c

@@ -1073,6 +1073,27 @@ static void displaychangelistener_gfx_switch(DisplayChangeListener *dcl,
     }
 }
 
+static void dpy_gfx_create_texture(QemuConsole *con, DisplaySurface *surface)
+{
+    if (con->gl && con->gl->ops->dpy_gl_ctx_create_texture) {
+        con->gl->ops->dpy_gl_ctx_create_texture(con->gl, surface);
+    }
+}
+
+static void dpy_gfx_destroy_texture(QemuConsole *con, DisplaySurface *surface)
+{
+    if (con->gl && con->gl->ops->dpy_gl_ctx_destroy_texture) {
+        con->gl->ops->dpy_gl_ctx_destroy_texture(con->gl, surface);
+    }
+}
+
+static void dpy_gfx_update_texture(QemuConsole *con, DisplaySurface *surface,
+                                   int x, int y, int w, int h)
+{
+    if (con->gl && con->gl->ops->dpy_gl_ctx_update_texture) {
+        con->gl->ops->dpy_gl_ctx_update_texture(con->gl, surface, x, y, w, h);
+    }
+}
 
 static void displaychangelistener_display_console(DisplayChangeListener *dcl,
                                                   QemuConsole *con,
@@ -1086,6 +1107,9 @@ static void displaychangelistener_display_console(DisplayChangeListener *dcl,
         if (!dummy) {
             dummy = qemu_create_placeholder_surface(640, 480, nodev);
         }
+        if (con) {
+            dpy_gfx_create_texture(con, dummy);
+        }
         displaychangelistener_gfx_switch(dcl, dummy, TRUE);
         return;
     }
@@ -1105,6 +1129,7 @@ static void displaychangelistener_display_console(DisplayChangeListener *dcl,
                                          con->scanout.texture.width,
                                          con->scanout.texture.height);
     } else if (con->scanout.kind == SCANOUT_SURFACE) {
+        dpy_gfx_create_texture(con, con->surface);
         displaychangelistener_gfx_switch(dcl, con->surface, TRUE);
     }
 }
@@ -1637,6 +1662,7 @@ void dpy_gfx_update(QemuConsole *con, int x, int y, int w, int h)
     if (!qemu_console_is_visible(con)) {
         return;
     }
+    dpy_gfx_update_texture(con, con->surface, x, y, w, h);
     QLIST_FOREACH(dcl, &s->listeners, next) {
         if (con != (dcl->con ? dcl->con : active_console)) {
             continue;
@@ -1681,12 +1707,14 @@ void dpy_gfx_replace_surface(QemuConsole *con,
 
     con->scanout.kind = SCANOUT_SURFACE;
     con->surface = surface;
+    dpy_gfx_create_texture(con, surface);
     QLIST_FOREACH(dcl, &s->listeners, next) {
         if (con != (dcl->con ? dcl->con : active_console)) {
             continue;
         }
         displaychangelistener_gfx_switch(dcl, surface, FALSE);
     }
+    dpy_gfx_destroy_texture(con, old_surface);
     qemu_free_displaysurface(old_surface);
 }
 

ui/dbus-listener.c

@@ -42,7 +42,6 @@ struct _DBusDisplayListener {
 
     DisplayChangeListener dcl;
     DisplaySurface *ds;
-    QemuGLShader *gls;
     int gl_updates;
 };
 
@@ -240,10 +239,6 @@ static void dbus_gl_gfx_update(DisplayChangeListener *dcl,
 {
     DBusDisplayListener *ddl = container_of(dcl, DBusDisplayListener, dcl);
 
-    if (ddl->ds) {
-        surface_gl_update_texture(ddl->gls, ddl->ds, x, y, w, h);
-    }
-
     ddl->gl_updates++;
 }
 
@@ -285,15 +280,11 @@ static void dbus_gl_gfx_switch(DisplayChangeListener *dcl,
 {
     DBusDisplayListener *ddl = container_of(dcl, DBusDisplayListener, dcl);
 
-    if (ddl->ds) {
-        surface_gl_destroy_texture(ddl->gls, ddl->ds);
-    }
     ddl->ds = new_surface;
     if (ddl->ds) {
         int width = surface_width(ddl->ds);
         int height = surface_height(ddl->ds);
 
-        surface_gl_create_texture(ddl->gls, ddl->ds);
         /* TODO: lazy send dmabuf (there are unnecessary sent otherwise) */
         dbus_scanout_texture(&ddl->dcl, ddl->ds->texture, false,
                              width, height, 0, 0, width, height);
@@ -403,7 +394,6 @@ dbus_display_listener_dispose(GObject *object)
     g_clear_object(&ddl->conn);
     g_clear_pointer(&ddl->bus_name, g_free);
     g_clear_object(&ddl->proxy);
-    g_clear_pointer(&ddl->gls, qemu_gl_fini_shader);
 
     G_OBJECT_CLASS(dbus_display_listener_parent_class)->dispose(object);
 }
@@ -414,7 +404,6 @@ dbus_display_listener_constructed(GObject *object)
     DBusDisplayListener *ddl = DBUS_DISPLAY_LISTENER(object);
 
     if (display_opengl) {
-        ddl->gls = qemu_gl_init_shader();
         ddl->dcl.ops = &dbus_gl_dcl_ops;
     } else {
         ddl->dcl.ops = &dbus_dcl_ops;

ui/dbus.c

@@ -55,11 +55,33 @@ dbus_is_compatible_dcl(DisplayGLCtx *dgc,
     return dcl->ops == &dbus_gl_dcl_ops || dcl->ops == &dbus_console_dcl_ops;
 }
 
+static void
+dbus_create_texture(DisplayGLCtx *ctx, DisplaySurface *surface)
+{
+    surface_gl_create_texture(ctx->gls, surface);
+}
+
+static void
+dbus_destroy_texture(DisplayGLCtx *ctx, DisplaySurface *surface)
+{
+    surface_gl_destroy_texture(ctx->gls, surface);
+}
+
+static void
+dbus_update_texture(DisplayGLCtx *ctx, DisplaySurface *surface,
+                    int x, int y, int w, int h)
+{
+    surface_gl_update_texture(ctx->gls, surface, x, y, w, h);
+}
+
 static const DisplayGLCtxOps dbus_gl_ops = {
     .dpy_gl_ctx_is_compatible_dcl = dbus_is_compatible_dcl,
     .dpy_gl_ctx_create       = dbus_create_context,
     .dpy_gl_ctx_destroy      = qemu_egl_destroy_context,
     .dpy_gl_ctx_make_current = qemu_egl_make_context_current,
+    .dpy_gl_ctx_create_texture = dbus_create_texture,
+    .dpy_gl_ctx_destroy_texture = dbus_destroy_texture,
+    .dpy_gl_ctx_update_texture = dbus_update_texture,
 };
 
 static NotifierList dbus_display_notifiers =
@@ -90,6 +112,9 @@ dbus_display_init(Object *o)
     g_autoptr(GDBusObjectSkeleton) vm = NULL;
 
     dd->glctx.ops = &dbus_gl_ops;
+    if (display_opengl) {
+        dd->glctx.gls = qemu_gl_init_shader();
+    }
     dd->iface = qemu_dbus_display1_vm_skeleton_new();
     dd->consoles = g_ptr_array_new_with_free_func(g_object_unref);
 
@@ -126,6 +151,7 @@ dbus_display_finalize(Object *o)
     g_clear_object(&dd->iface);
     g_free(dd->dbus_addr);
     g_free(dd->audiodev);
+    g_clear_pointer(&dd->glctx.gls, qemu_gl_fini_shader);
     dbus_display = NULL;
 }