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Implement multi-backend support

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The Clutter backend split is opaque enough that should allow us to just
build all possible backends inside the same shared object, and select
the wanted backend at initialization time.

This requires some work in the build system, as well as the
initialization code, to remove duplicate functions that might cause
conflicts at build and link time. We also need to defer all the checks
of the internal state of the platform-specific API to run-time type
checks.
This commit is contained in:
Emmanuele Bassi
2011-09-21 18:05:03 +01:00
parent 9c102b7c51
commit a09bbffd92
25 changed files with 591 additions and 411 deletions
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63
clutter/clutter-main.c
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@ -100,6 +100,7 @@
#include "clutter-actor.h"
#include "clutter-backend-private.h"
#include "clutter-config.h"
#include "clutter-debug.h"
#include "clutter-device-manager-private.h"
#include "clutter-event.h"
@ -114,6 +115,25 @@
#include "clutter-stage-private.h"
#include "clutter-version.h" /* For flavour define */
#ifdef CLUTTER_WINDOWING_OSX
#include "osx/clutter-backend-osx.h"
#endif
#ifdef CLUTTER_WINDOWING_WIN32
#include "win32/clutter-backend-win32.h"
#endif
#ifdef CLUTTER_WINDOWING_GDK
#include "gdk/clutter-backend-gdk.h"
#endif
#ifdef CLUTTER_WINDOWING_X11
#include "x11/clutter-backend-x11.h"
#endif
#ifdef CLUTTER_WINDOWING_EGL
#include "egl/clutter-backend-eglnative.h"
#endif
#ifdef CLUTTER_WINDOWING_WAYLAND
#include "wayland/clutter-backend-wayland.h"
#endif
#include <cogl/cogl.h>
#include <cogl-pango/cogl-pango.h>
@ -1299,11 +1319,46 @@ clutter_context_get_default_unlocked (void)
if (G_UNLIKELY (ClutterCntx == NULL))
{
ClutterMainContext *ctx;
const char *backend;
ClutterCntx = ctx = g_new0 (ClutterMainContext, 1);
/* create the default backend */
ctx->backend = g_object_new (_clutter_backend_impl_get_type (), NULL);
backend = g_getenv ("CLUTTER_BACKEND");
#ifdef CLUTTER_WINDOWING_OSX
if (backend == NULL || strcmp (backend, "osx") == 0)
ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_OSX, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_WIN32
if (backend == NULL || strcmp (backend, "win32") == 0)
ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_WIN32, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_WAYLAND
if (backend == NULL || strcmp (backend, "wayland") == 0)
ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_WAYLAND, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_EGL
if (backend == NULL || strcmp (backend, "eglnative") == 0)
ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_EGLNATIVE, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_X11
if (backend == NULL || strcmp (backend, "x11") == 0)
ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_X11, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_GDK
if (backend == NULL || strcmp (backend, "gdk") == 0)
ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_GDK, NULL);
else
#endif
if (backend != NULL)
g_error ("Unsupported Clutter backend: '%s'", backend);
else
g_error ("No default Clutter backend found.");
ctx->is_initialized = FALSE;
ctx->motion_events_per_actor = TRUE;
@ -1320,6 +1375,10 @@ clutter_context_get_default_unlocked (void)
#endif
ctx->last_repaint_id = 1;
CLUTTER_NOTE (BACKEND, "Backend type: '%s' (requested: '%s')",
G_OBJECT_TYPE_NAME (ctx->backend),
backend != NULL ? backend : "<default>");
}
return ClutterCntx;