ui/console: move dcl compatiblity check to a callback

As expected from the "compatible_dcl" comment, a simple comparison of
ops isn't enough. The following patch will fix a regression introduced
by this limited check by extending the compatibility callback for
egl-headless.

For now, this patch simply replaces the the "compatible_dcl" ops pointer
with a "dpy_gl_ctx_is_compatible_ctx" callback.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

include/ui/console.h

@@ -282,13 +282,8 @@ struct DisplayChangeListener {
 };
 
 typedef struct DisplayGLCtxOps {
-    /*
+    bool (*dpy_gl_ctx_is_compatible_dcl)(DisplayGLCtx *dgc,
-     * We only check if the GLCtx is compatible with a DCL via ops. A natural
+                                         DisplayChangeListener *dcl);
-     * evolution of this would be a callback to check some runtime requirements
-     * and allow various DCL kinds.
-     */
-    const DisplayChangeListenerOps *compatible_dcl;
-
     QEMUGLContext (*dpy_gl_ctx_create)(DisplayGLCtx *dgc,
                                        QEMUGLParams *params);
     void (*dpy_gl_ctx_destroy)(DisplayGLCtx *dgc,

ui/console.c

@@ -1482,7 +1482,8 @@ static bool dpy_compatible_with(QemuConsole *con,
 
     flags = con->hw_ops->get_flags ? con->hw_ops->get_flags(con->hw) : 0;
 
-    if (console_has_gl(con) && con->gl->ops->compatible_dcl != dcl->ops) {
+    if (console_has_gl(con) &&
+        !con->gl->ops->dpy_gl_ctx_is_compatible_dcl(con->gl, dcl)) {
         error_setg(errp, "Display %s is incompatible with the GL context",
                    dcl->ops->dpy_name);
         return false;

ui/dbus.c

@@ -48,8 +48,15 @@ static QEMUGLContext dbus_create_context(DisplayGLCtx *dgc,
     return qemu_egl_create_context(dgc, params);
 }
 
+static bool
+dbus_is_compatible_dcl(DisplayGLCtx *dgc,
+                       DisplayChangeListener *dcl)
+{
+    return dcl->ops == &dbus_gl_dcl_ops;
+}
+
 static const DisplayGLCtxOps dbus_gl_ops = {
-    .compatible_dcl          = &dbus_gl_dcl_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,

ui/egl-headless.c

@@ -166,8 +166,15 @@ static const DisplayChangeListenerOps egl_ops = {
     .dpy_gl_update           = egl_scanout_flush,
 };
 
+static bool
+egl_is_compatible_dcl(DisplayGLCtx *dgc,
+                      DisplayChangeListener *dcl)
+{
+    return dcl->ops == &egl_ops;
+}
+
 static const DisplayGLCtxOps eglctx_ops = {
-    .compatible_dcl          = &egl_ops,
+    .dpy_gl_ctx_is_compatible_dcl = egl_is_compatible_dcl,
     .dpy_gl_ctx_create       = egl_create_context,
     .dpy_gl_ctx_destroy      = qemu_egl_destroy_context,
     .dpy_gl_ctx_make_current = qemu_egl_make_context_current,

ui/gtk.c

@@ -614,8 +614,15 @@ static const DisplayChangeListenerOps dcl_gl_area_ops = {
     .dpy_has_dmabuf          = gd_has_dmabuf,
 };
 
+static bool
+gd_gl_area_is_compatible_dcl(DisplayGLCtx *dgc,
+                             DisplayChangeListener *dcl)
+{
+    return dcl->ops == &dcl_gl_area_ops;
+}
+
 static const DisplayGLCtxOps gl_area_ctx_ops = {
-    .compatible_dcl          = &dcl_gl_area_ops,
+    .dpy_gl_ctx_is_compatible_dcl = gd_gl_area_is_compatible_dcl,
     .dpy_gl_ctx_create       = gd_gl_area_create_context,
     .dpy_gl_ctx_destroy      = gd_gl_area_destroy_context,
     .dpy_gl_ctx_make_current = gd_gl_area_make_current,
@@ -641,8 +648,15 @@ static const DisplayChangeListenerOps dcl_egl_ops = {
     .dpy_has_dmabuf          = gd_has_dmabuf,
 };
 
+static bool
+gd_egl_is_compatible_dcl(DisplayGLCtx *dgc,
+                         DisplayChangeListener *dcl)
+{
+    return dcl->ops == &dcl_egl_ops;
+}
+
 static const DisplayGLCtxOps egl_ctx_ops = {
-    .compatible_dcl          = &dcl_egl_ops,
+    .dpy_gl_ctx_is_compatible_dcl = gd_egl_is_compatible_dcl,
     .dpy_gl_ctx_create       = gd_egl_create_context,
     .dpy_gl_ctx_destroy      = qemu_egl_destroy_context,
     .dpy_gl_ctx_make_current = gd_egl_make_current,

ui/sdl2.c

@@ -788,8 +788,15 @@ static const DisplayChangeListenerOps dcl_gl_ops = {
     .dpy_gl_update           = sdl2_gl_scanout_flush,
 };
 
+static bool
+sdl2_gl_is_compatible_dcl(DisplayGLCtx *dgc,
+                          DisplayChangeListener *dcl)
+{
+    return dcl->ops == &dcl_gl_ops;
+}
+
 static const DisplayGLCtxOps gl_ctx_ops = {
-    .compatible_dcl          = &dcl_gl_ops,
+    .dpy_gl_ctx_is_compatible_dcl = sdl2_gl_is_compatible_dcl,
     .dpy_gl_ctx_create       = sdl2_gl_create_context,
     .dpy_gl_ctx_destroy      = sdl2_gl_destroy_context,
     .dpy_gl_ctx_make_current = sdl2_gl_make_context_current,

ui/spice-display.c

@@ -1125,8 +1125,15 @@ static const DisplayChangeListenerOps display_listener_gl_ops = {
     .dpy_gl_update           = qemu_spice_gl_update,
 };
 
+static bool
+qemu_spice_is_compatible_dcl(DisplayGLCtx *dgc,
+                             DisplayChangeListener *dcl)
+{
+    return dcl->ops == &display_listener_gl_ops;
+}
+
 static const DisplayGLCtxOps gl_ctx_ops = {
-    .compatible_dcl          = &display_listener_gl_ops,
+    .dpy_gl_ctx_is_compatible_dcl = qemu_spice_is_compatible_dcl,
     .dpy_gl_ctx_create       = qemu_spice_gl_create_context,
     .dpy_gl_ctx_destroy      = qemu_egl_destroy_context,
     .dpy_gl_ctx_make_current = qemu_egl_make_context_current,