Add temporary cogl-clutter.h to aid splitting out Cogl

This gives us a way to clearly track the internal Cogl API that Clutter
depends on. The aim is to split Cogl out from Clutter into a standalone
3D graphics API and eventually we want to get rid of any private
interfaces for Clutter so its useful to have a handle on that task.
Actually it's not as bad as I was expecting though.

clutter/clutter-backend.c

@@ -465,7 +465,7 @@ _clutter_backend_ensure_context (ClutterBackend *backend,
 
           clutter_actor_get_size (CLUTTER_ACTOR (stage), &width, &height);
 
-          _cogl_onscreen_clutter_backend_set_size (width, height);
+          cogl_onscreen_clutter_backend_set_size (width, height);
 
           /* Eventually we will have a separate CoglFramebuffer for
            * each stage and each one will track private projection

clutter/clutter-stage.c

@@ -373,7 +373,7 @@ clutter_stage_allocate (ClutterActor           *self,
    * window has a chance to update the window size based on the
    * allocation. */
   _clutter_stage_window_get_geometry (priv->impl, &geom);
-  _cogl_onscreen_clutter_backend_set_size (geom.width, geom.height);
+  cogl_onscreen_clutter_backend_set_size (geom.width, geom.height);
 
   clutter_actor_get_allocation_geometry (self, &geom);
   if (geom.width != prev_geom.width || geom.height != prev_geom.height)

clutter/cogl/cogl/Makefile.am

@@ -78,6 +78,7 @@ cogl_public_h = \
 	$(srcdir)/cogl-attribute.h 		\
 	$(srcdir)/cogl-primitive.h 		\
 	$(srcdir)/cogl-clip-state.h		\
+	$(srcdir)/cogl-clutter.h       		\
 	$(srcdir)/cogl.h			\
 	$(NULL)
 
@@ -273,6 +274,7 @@ cogl_sources_c = \
 	$(srcdir)/cogl-gtype-private.h                  \
 	$(srcdir)/cogl-point-in-poly-private.h       	\
 	$(srcdir)/cogl-point-in-poly.c       		\
+	$(srcdir)/cogl-clutter.c       			\
 	$(NULL)
 
 if SUPPORT_XLIB

clutter/cogl/cogl/cogl-clutter.c

@@ -0,0 +1,59 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2011 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors:
+ *   Robert Bragg <robert@linux.intel.com>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <glib.h>
+
+#include "cogl.h"
+#include "cogl-types.h"
+#include "cogl-private.h"
+#include "cogl-context-private.h"
+#include "cogl-winsys-private.h"
+#include "cogl-framebuffer-private.h"
+
+gboolean
+cogl_clutter_check_extension (const char *name, const char *ext)
+{
+  return _cogl_check_extension (name, ext);
+}
+
+void
+cogl_onscreen_clutter_backend_set_size (int width, int height)
+{
+  CoglFramebuffer *framebuffer;
+
+  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+
+  if (!ctx->stub_winsys)
+    return;
+
+  framebuffer = COGL_FRAMEBUFFER (ctx->window_buffer);
+
+  _cogl_framebuffer_winsys_update_size (framebuffer, width, height);
+}

clutter/cogl/cogl/cogl-clutter.h

@@ -0,0 +1,47 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2011 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
+#error "Only <cogl/cogl.h> can be included directly."
+#endif
+
+#ifndef __COGL_CLUTTER_H__
+#define __COGL_CLUTTER_H__
+
+#ifdef COGL_HAS_XLIB
+#include <X11/Xutil.h>
+#endif
+
+G_BEGIN_DECLS
+
+#define cogl_clutter_check_extension cogl_clutter_check_extension_CLUTTER
+gboolean
+cogl_clutter_check_extension (const char *name, const char *ext);
+
+#define cogl_onscreen_clutter_backend_set_size cogl_onscreen_clutter_backend_set_size_CLUTTER
+void
+cogl_onscreen_clutter_backend_set_size (int width, int height);
+
+G_END_DECLS
+
+#endif /* __COGL_CLUTTER_H__ */

clutter/cogl/cogl/cogl-framebuffer-private.h

@@ -113,6 +113,10 @@ typedef struct _CoglOnscreen
 void
 _cogl_framebuffer_state_init (void);
 
+void
+_cogl_framebuffer_winsys_update_size (CoglFramebuffer *framebuffer,
+                                      int width, int height);
+
 void
 _cogl_clear4f (unsigned long buffers,
                float red,

clutter/cogl/cogl/cogl-framebuffer.c

@@ -989,13 +989,10 @@ _cogl_onscreen_free (CoglOnscreen *onscreen)
 }
 
 void
-_cogl_onscreen_clutter_backend_set_size (int width, int height)
+_cogl_framebuffer_winsys_update_size (CoglFramebuffer *framebuffer,
+                                      int width, int height)
 {
-  CoglFramebuffer *framebuffer;
+  CoglContext *ctx = framebuffer->context;
-
-  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
-
-  framebuffer = COGL_FRAMEBUFFER (ctx->window_buffer);
 
   if (framebuffer->width == width && framebuffer->height == height)
     return;

clutter/cogl/cogl/cogl-private.h

@@ -26,6 +26,9 @@
 
 G_BEGIN_DECLS
 
+gboolean
+_cogl_check_extension (const char *name, const char *ext);
+
 void
 _cogl_clear (const CoglColor *color, unsigned long buffers);
 

clutter/cogl/cogl/cogl.h

@@ -1277,9 +1277,6 @@ _cogl_check_driver_valid (GError **error);
 GQuark
 _cogl_driver_error_quark (void);
 
-void
-_cogl_onscreen_clutter_backend_set_size (int width, int height);
-
 #ifdef COGL_ENABLE_EXPERIMENTAL_API
 #define cogl_get_draw_framebuffer cogl_get_draw_framebuffer_EXP
 CoglFramebuffer *

clutter/egl/clutter-backend-egl.c

@@ -690,7 +690,7 @@ clutter_backend_egl_get_features (ClutterBackend *backend)
 
   egl_extensions = eglQueryString (backend_egl->edpy, EGL_EXTENSIONS);
 
-  if (_cogl_check_extension ("EGL_NOK_swap_region", egl_extensions))
+  if (cogl_clutter_check_extension ("EGL_NOK_swap_region", egl_extensions))
     {
       CLUTTER_NOTE (BACKEND,
                     "Using EGL_NOK_swap_region for sub_buffer copies");
@@ -704,7 +704,7 @@ clutter_backend_egl_get_features (ClutterBackend *backend)
 
 #if 0 /* XXX need GL_ARB_draw_buffers */
   if (!backend_egl->swap_buffers_region &&
-      _cogl_check_extension ("GL_EXT_framebuffer_blit", gl_extensions))
+      cogl_clutter_check_extension ("GL_EXT_framebuffer_blit", gl_extensions))
     {
       CLUTTER_NOTE (BACKEND,
                     "Using glBlitFramebuffer fallback for sub_buffer copies");

clutter/wayland/clutter-backend-wayland.c

@@ -228,9 +228,9 @@ try_enable_drm (ClutterBackendWayland *backend_wayland, GError **error)
   glexts = glGetString(GL_EXTENSIONS);
   exts = eglQueryString (backend_wayland->edpy, EGL_EXTENSIONS);
 
-  if (!_cogl_check_extension ("EGL_KHR_image_base", exts) ||
+  if (!cogl_clutter_check_extension ("EGL_KHR_image_base", exts) ||
-      !_cogl_check_extension ("EGL_MESA_drm_image", exts) ||
+      !cogl_clutter_check_extension ("EGL_MESA_drm_image", exts) ||
-      !_cogl_check_extension ("GL_OES_EGL_image", glexts))
+      !cogl_clutter_check_extension ("GL_OES_EGL_image", glexts))
     {
       g_set_error (error, CLUTTER_INIT_ERROR,
 		   CLUTTER_INIT_ERROR_BACKEND,
@@ -456,7 +456,7 @@ clutter_backend_wayland_create_context (ClutterBackend  *backend,
 #endif
   egl_extensions = eglQueryString (backend_wayland->edpy, EGL_EXTENSIONS);
 
-  if (!_cogl_check_extension (_COGL_SURFACELESS_EXTENSION, egl_extensions))
+  if (!cogl_clutter_check_extension (_COGL_SURFACELESS_EXTENSION, egl_extensions))
     {
       g_debug("Could not find the " _COGL_SURFACELESS_EXTENSION
               " extension; falling back to binding a dummy surface");

clutter/win32/clutter-backend-win32.c

@@ -227,7 +227,7 @@ clutter_backend_win32_get_features (ClutterBackend *backend)
      for the swap control extension */
   if (getenv ("__GL_SYNC_TO_VBLANK") || check_vblank_env ("default"))
     CLUTTER_NOTE (BACKEND, "vblank sync: left at default at user request");
-  else if (_cogl_check_extension ("WGL_EXT_swap_control", extensions)
+  else if (cogl_clutter_check_extension ("WGL_EXT_swap_control", extensions)
 	   && (swap_interval = (SwapIntervalProc)
 	       cogl_get_proc_address ("wglSwapIntervalEXT")))
     {

clutter/x11/clutter-stage-x11.c

@@ -915,7 +915,7 @@ clutter_stage_x11_translate_event (ClutterEventTranslator *translator,
 
               /* Queue a relayout - we want glViewport to be called
                * with the correct values, and this is done in ClutterStage
-               * via _cogl_onscreen_clutter_backend_set_size ().
+               * via cogl_onscreen_clutter_backend_set_size ().
                *
                * We queue a relayout, because if this ConfigureNotify is
                * in response to a size we set in the application, the