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mutter/cogl/winsys/cogl-winsys-egl.c
Neil Roberts 463603f1a0 cogl-winsys: Fix freeing a CoglOnscreen 
All of the winsys backends didn't handle cleaning up the CoglOnscreen
properly so that they would assert in cogl_onscreen_free because the
winsys pointer is never freed. They also didn't cope if deinit is
called before init (which will be the case if an onscreen is created
and freed without being allocated).
2011-05-10 20:23:39 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2010,2011 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, see
* <http://www.gnu.org/licenses/>.
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-winsys-private.h"
#include "cogl-feature-private.h"
#include "cogl-context-private.h"
#include "cogl-framebuffer.h"
#include "cogl-swap-chain-private.h"
#include "cogl-renderer-private.h"
#include "cogl-onscreen-template-private.h"
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
#include "cogl-renderer-xlib-private.h"
#include "cogl-display-xlib-private.h"
#endif
#include "cogl-private.h"
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
#include <wayland-client.h>
#include <wayland-egl.h>
#endif
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <glib/gi18n-lib.h>
#ifdef COGL_HAS_GLES1
#include <GLES/gl.h>
#include <GLES/egl.h>
#else
#include <EGL/egl.h>
#define NativeDisplayType EGLNativeDisplayType
#define NativeWindowType EGLNativeWindowType
#endif
#include <EGL/egl.h>
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
#include <X11/Xlib.h>
#define COGL_ONSCREEN_X11_EVENT_MASK StructureNotifyMask
#endif
typedef struct _CoglRendererEGL
{
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
CoglRendererXlib _parent;
#endif
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
struct wl_display *wayland_display;
struct wl_compositor *wayland_compositor;
uint32_t wayland_event_mask;
#endif
EGLDisplay edpy;
EGLint egl_version_major;
EGLint egl_version_minor;
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
gboolean gdl_initialized;
#endif
/* Function pointers for GLX specific extensions */
#define COGL_WINSYS_FEATURE_BEGIN(a, b, c, d, e, f)
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
ret (APIENTRY * pf_ ## name) args;
#define COGL_WINSYS_FEATURE_END()
#include "cogl-winsys-egl-feature-functions.h"
#undef COGL_WINSYS_FEATURE_BEGIN
#undef COGL_WINSYS_FEATURE_FUNCTION
#undef COGL_WINSYS_FEATURE_END
} CoglRendererEGL;
typedef struct _CoglDisplayEGL
{
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
CoglDisplayXlib _parent;
#endif
EGLContext egl_context;
#if defined (COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT)
EGLSurface dummy_surface;
#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
struct wl_surface *wayland_surface;
struct wl_egl_window *wayland_egl_native_window;
EGLSurface dummy_surface;
#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT) || \
defined (COGL_HAS_EGL_PLATFORM_GDL_SUPPORT)
EGLSurface egl_surface;
int egl_surface_width;
int egl_surface_height;
gboolean have_onscreen;
#else
#error "Unknown EGL platform"
#endif
EGLConfig egl_config;
gboolean found_egl_config;
} CoglDisplayEGL;
typedef struct _CoglContextEGL
{
EGLSurface current_surface;
} CoglContextEGL;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
typedef struct _CoglOnscreenXlib
{
Window xwin;
gboolean is_foreign_xwin;
} CoglOnscreenXlib;
#endif
typedef struct _CoglOnscreenEGL
{
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
CoglOnscreenXlib _parent;
#endif
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
struct wl_egl_window *wayland_egl_native_window;
struct wl_surface *wayland_surface;
#endif
EGLSurface egl_surface;
} CoglOnscreenEGL;
/* Define a set of arrays containing the functions required from GL
for each winsys feature */
#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names, \
feature_flags, feature_flags_private, \
winsys_feature) \
static const CoglFeatureFunction \
cogl_egl_feature_ ## name ## _funcs[] = {
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
{ G_STRINGIFY (name), G_STRUCT_OFFSET (CoglRendererEGL, pf_ ## name) },
#define COGL_WINSYS_FEATURE_END() \
{ NULL, 0 }, \
};
#include "cogl-winsys-egl-feature-functions.h"
/* Define an array of features */
#undef COGL_WINSYS_FEATURE_BEGIN
#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names, \
feature_flags, feature_flags_private, \
winsys_feature) \
{ 255, 255, namespaces, extension_names, \
feature_flags, feature_flags_private, \
winsys_feature, \
cogl_egl_feature_ ## name ## _funcs },
#undef COGL_WINSYS_FEATURE_FUNCTION
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args)
#undef COGL_WINSYS_FEATURE_END
#define COGL_WINSYS_FEATURE_END()
static const CoglFeatureData winsys_feature_data[] =
{
#include "cogl-winsys-egl-feature-functions.h"
};
static CoglFuncPtr
_cogl_winsys_get_proc_address (const char *name)
{
return (CoglFuncPtr) eglGetProcAddress (name);
}
#undef COGL_WINSYS_FEATURE_BEGIN
#define COGL_WINSYS_FEATURE_BEGIN(a, b, c, d, e, f)
#undef COGL_WINSYS_FEATURE_FUNCTION
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
egl_renderer->pf_ ## name = NULL;
#undef COGL_WINSYS_FEATURE_END
#define COGL_WINSYS_FEATURE_END()
static void
initialize_function_table (CoglRenderer *renderer)
{
CoglRendererEGL *egl_renderer = renderer->winsys;
#include "cogl-winsys-egl-feature-functions.h"
}
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
static CoglOnscreen *
find_onscreen_for_xid (CoglContext *context, guint32 xid)
{
GList *l;
for (l = context->framebuffers; l; l = l->next)
{
CoglFramebuffer *framebuffer = l->data;
CoglOnscreenXlib *xlib_onscreen;
if (!framebuffer->type == COGL_FRAMEBUFFER_TYPE_ONSCREEN)
continue;
xlib_onscreen = COGL_ONSCREEN (framebuffer)->winsys;
if (xlib_onscreen->xwin == (Window)xid)
return COGL_ONSCREEN (framebuffer);
}
return NULL;
}
static CoglFilterReturn
event_filter_cb (void *event, void *data)
{
XEvent *xevent = event;
CoglContext *context = data;
if (xevent->type == ConfigureNotify)
{
CoglOnscreen *onscreen =
find_onscreen_for_xid (context, xevent->xconfigure.window);
if (onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
/* XXX: consider adding an abstraction for this... */
framebuffer->width = xevent->xconfigure.width;
framebuffer->height = xevent->xconfigure.height;
}
}
return COGL_FILTER_CONTINUE;
}
#endif /* COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT */
static void
_cogl_winsys_renderer_disconnect (CoglRenderer *renderer)
{
CoglRendererEGL *egl_renderer = renderer->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
if (egl_renderer->gdl_initialized)
gdl_close ();
#endif
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
_cogl_renderer_xlib_disconnect (renderer);
#endif
eglTerminate (egl_renderer->edpy);
g_slice_free (CoglRendererEGL, egl_renderer);
}
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
static void
display_handle_global_cb (struct wl_display *display,
uint32_t id,
const char *interface,
uint32_t version,
void *data)
{
struct wl_compositor **compositor = data;
if (strcmp (interface, "wl_compositor") == 0)
*compositor = wl_compositor_create (display, id, 1);
}
static int
event_mask_update_cb (uint32_t mask, void *user_data)
{
CoglRendererEGL *egl_renderer = user_data;
egl_renderer->wayland_event_mask = mask;
return 0;
}
static void
sync_callback(void *data)
{
int *done = data;
*done = 1;
}
static void
force_roundtrip(struct wl_display *display)
{
int done = 0;
wl_display_sync_callback(display, sync_callback, &done);
wl_display_iterate(display, WL_DISPLAY_WRITABLE);
while (!done)
wl_display_iterate(display, WL_DISPLAY_READABLE);
}
#endif
static gboolean
_cogl_winsys_renderer_connect (CoglRenderer *renderer,
GError **error)
{
CoglRendererEGL *egl_renderer;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
CoglRendererXlib *xlib_renderer;
#endif
EGLBoolean status;
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
gdl_ret_t rc = GDL_SUCCESS;
gdl_display_info_t gdl_display_info;
#endif
renderer->winsys = g_slice_new0 (CoglRendererEGL);
egl_renderer = renderer->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
xlib_renderer = renderer->winsys;
if (!_cogl_renderer_xlib_connect (renderer, error))
goto error;
egl_renderer->edpy =
eglGetDisplay ((NativeDisplayType) xlib_renderer->xdpy);
status = eglInitialize (egl_renderer->edpy,
&egl_renderer->egl_version_major,
&egl_renderer->egl_version_minor);
#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
if (renderer->foreign_wayland_display)
{
egl_renderer->wayland_display = renderer->foreign_wayland_display;
/* XXX: For now we have to assume that if a foreign display is
* given then so is a foreing compositor because there is no way
* to retrospectively be notified of the compositor. */
g_assert (renderer->foreign_wayland_compositor);
egl_renderer->wayland_compositor = renderer->foreign_wayland_compositor;
}
else
{
egl_renderer->wayland_display = wl_display_connect (NULL);
if (!egl_renderer->wayland_display)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"Failed to connect wayland display");
goto error;
}
/*
* XXX: For some reason, this can only be done after calling
* eglInitialize otherwise eglInitialize fails in
* dri2_initialize_wayland because dri2_dpy->wl_dpy->fd doesn't get
* updated.
*
* XXX: Hmm actually now it seems to work :-/
* There seems to be some fragility about when this is called.
*/
wl_display_add_global_listener (egl_renderer->wayland_display,
display_handle_global_cb,
&egl_renderer->wayland_compositor);
}
egl_renderer->edpy =
eglGetDisplay ((EGLNativeDisplayType)egl_renderer->wayland_display);
status = eglInitialize (egl_renderer->edpy,
&egl_renderer->egl_version_major,
&egl_renderer->egl_version_minor);
wl_display_flush (egl_renderer->wayland_display);
wl_display_get_fd (egl_renderer->wayland_display,
event_mask_update_cb, egl_renderer);
/* Wait until we have been notified about the compositor object */
while (!egl_renderer->wayland_compositor)
wl_display_iterate (egl_renderer->wayland_display,
egl_renderer->wayland_event_mask);
#else
egl_renderer->edpy = eglGetDisplay (EGL_DEFAULT_DISPLAY);
status = eglInitialize (egl_renderer->edpy,
&egl_renderer->egl_version_major,
&egl_renderer->egl_version_minor);
#endif
if (status != EGL_TRUE)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"Failed to initialize EGL");
goto error;
}
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
/* Check we can talk to the GDL library */
rc = gdl_init (NULL);
if (rc != GDL_SUCCESS)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"GDL initialize failed. %s",
gdl_get_error_string (rc));
goto error;
}
rc = gdl_get_display_info (GDL_DISPLAY_ID_0, &gdl_display_info);
if (rc != GDL_SUCCESS)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"GDL failed to get display information: %s",
gdl_get_error_string (rc));
gdl_close ();
goto error;
}
gdl_close ();
#endif
return TRUE;
error:
_cogl_winsys_renderer_disconnect (renderer);
return FALSE;
}
static void
update_winsys_features (CoglContext *context)
{
CoglDisplayEGL *egl_display = context->display->winsys;
CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
const char *egl_extensions;
int i;
g_return_if_fail (egl_display->egl_context);
_cogl_gl_update_features (context);
memset (context->winsys_features, 0, sizeof (context->winsys_features));
egl_extensions = eglQueryString (egl_renderer->edpy, EGL_EXTENSIONS);
COGL_NOTE (WINSYS, " EGL Extensions: %s", egl_extensions);
#if defined (COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT) || \
defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
context->feature_flags |= COGL_FEATURE_ONSCREEN_MULTIPLE;
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN,
TRUE);
#endif
initialize_function_table (context->display->renderer);
for (i = 0; i < G_N_ELEMENTS (winsys_feature_data); i++)
if (_cogl_feature_check ("EGL", winsys_feature_data + i, 0, 0,
egl_extensions,
egl_renderer))
{
context->feature_flags |= winsys_feature_data[i].feature_flags;
if (winsys_feature_data[i].winsys_feature)
COGL_FLAGS_SET (context->winsys_features,
winsys_feature_data[i].winsys_feature,
TRUE);
}
/* FIXME: the winsys_feature_data can currently only have one
* winsys feature per extension... */
if (egl_renderer->pf_eglSwapBuffersRegion)
{
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_SWAP_REGION, TRUE);
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_SWAP_REGION_THROTTLE, TRUE);
}
}
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
static XVisualInfo *
get_visual_info (CoglDisplay *display, EGLConfig egl_config)
{
CoglRendererXlib *xlib_renderer = display->renderer->winsys;
CoglRendererEGL *egl_renderer = display->renderer->winsys;
XVisualInfo visinfo_template;
int template_mask = 0;
XVisualInfo *visinfo = NULL;
int visinfos_count;
EGLint visualid, red_size, green_size, blue_size, alpha_size;
eglGetConfigAttrib (egl_renderer->edpy, egl_config,
EGL_NATIVE_VISUAL_ID, &visualid);
if (visualid != 0)
{
visinfo_template.visualid = visualid;
template_mask |= VisualIDMask;
}
else
{
/* some EGL drivers don't implement the EGL_NATIVE_VISUAL_ID
* attribute, so attempt to find the closest match. */
eglGetConfigAttrib (egl_renderer->edpy, egl_config,
EGL_RED_SIZE, &red_size);
eglGetConfigAttrib (egl_renderer->edpy, egl_config,
EGL_GREEN_SIZE, &green_size);
eglGetConfigAttrib (egl_renderer->edpy, egl_config,
EGL_BLUE_SIZE, &blue_size);
eglGetConfigAttrib (egl_renderer->edpy, egl_config,
EGL_ALPHA_SIZE, &alpha_size);
visinfo_template.depth = red_size + green_size + blue_size + alpha_size;
template_mask |= VisualDepthMask;
visinfo_template.screen = DefaultScreen (xlib_renderer->xdpy);
template_mask |= VisualScreenMask;
}
visinfo = XGetVisualInfo (xlib_renderer->xdpy,
template_mask,
&visinfo_template,
&visinfos_count);
return visinfo;
}
#endif
static gboolean
try_create_context (CoglDisplay *display,
int retry_cookie,
gboolean *try_fallback,
GError **error)
{
CoglDisplayEGL *egl_display = display->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
CoglDisplayXlib *xlib_display = display->winsys;
CoglRendererXlib *xlib_renderer = display->renderer->winsys;
#endif
CoglRendererEGL *egl_renderer = display->renderer->winsys;
EGLDisplay edpy;
EGLConfig config;
EGLint config_count = 0;
EGLBoolean status;
EGLint cfg_attribs[] = {
/* NB: This must be the first attribute, since we may
* try and fallback to no stencil buffer */
EGL_STENCIL_SIZE, 2,
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_ALPHA_SIZE, EGL_DONT_CARE,
EGL_DEPTH_SIZE, 1,
/* XXX: Why does the GDL platform choose these by default? */
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
EGL_BIND_TO_TEXTURE_RGBA, EGL_TRUE,
EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE,
#endif
EGL_BUFFER_SIZE, EGL_DONT_CARE,
#if defined (HAVE_COGL_GL)
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
#elif defined (HAVE_COGL_GLES2)
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
#else
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT,
#endif
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_NONE
};
#if defined (HAVE_COGL_GLES2)
EGLint attribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
#else
EGLint *attribs = NULL;
#endif
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
XVisualInfo *xvisinfo;
XSetWindowAttributes attrs;
#endif
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
struct wl_visual *wayland_visual;
#endif
const char *error_message;
edpy = egl_renderer->edpy;
#ifdef HAVE_COGL_GL
eglBindAPI (EGL_OPENGL_API);
#endif
/* Some GLES hardware can't support a stencil buffer: */
if (retry_cookie == 1)
{
g_warning ("Trying with stencil buffer disabled...");
cfg_attribs[1 /* EGL_STENCIL_SIZE */] = 0;
}
/* XXX: at this point we only have one fallback */
status = eglChooseConfig (edpy,
cfg_attribs,
&config, 1,
&config_count);
if (status != EGL_TRUE || config_count == 0)
{
error_message = "Unable to find a usable EGL configuration";
goto fail;
}
egl_display->egl_config = config;
egl_display->egl_context = eglCreateContext (edpy,
config,
EGL_NO_CONTEXT,
attribs);
if (egl_display->egl_context == EGL_NO_CONTEXT)
{
error_message = "Unable to create a suitable EGL context";
goto fail;
}
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
xvisinfo = get_visual_info (display, config);
if (xvisinfo == NULL)
{
error_message = "Unable to find suitable X visual";
goto fail;
}
attrs.override_redirect = True;
attrs.colormap = XCreateColormap (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
xvisinfo->visual,
AllocNone);
attrs.border_pixel = 0;
xlib_display->dummy_xwin =
XCreateWindow (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
-100, -100, 1, 1,
0,
xvisinfo->depth,
CopyFromParent,
xvisinfo->visual,
CWOverrideRedirect |
CWColormap |
CWBorderPixel,
&attrs);
XFree (xvisinfo);
egl_display->dummy_surface =
eglCreateWindowSurface (edpy,
egl_display->egl_config,
(NativeWindowType) xlib_display->dummy_xwin,
NULL);
if (egl_display->dummy_surface == EGL_NO_SURFACE)
{
error_message = "Unable to create an EGL surface";
goto fail;
}
if (!eglMakeCurrent (edpy,
egl_display->dummy_surface,
egl_display->dummy_surface,
egl_display->egl_context))
{
error_message = "Unable to eglMakeCurrent with dummy surface";
goto fail;
}
#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
egl_display->wayland_surface =
wl_compositor_create_surface (egl_renderer->wayland_compositor);
if (!egl_display->wayland_surface)
{
error_message= "Failed to create a dummy wayland surface";
goto fail;
}
wayland_visual =
wl_display_get_premultiplied_argb_visual (egl_renderer->wayland_display);
egl_display->wayland_egl_native_window =
wl_egl_window_create (egl_display->wayland_surface,
1,
1,
wayland_visual);
if (!egl_display->wayland_egl_native_window)
{
error_message= "Failed to create a dummy wayland native egl surface";
goto fail;
}
egl_display->dummy_surface =
eglCreateWindowSurface (edpy,
egl_display->egl_config,
(EGLNativeWindowType)
egl_display->wayland_egl_native_window,
NULL);
if (egl_display->dummy_surface == EGL_NO_SURFACE)
{
error_message= "Unable to eglMakeCurrent with dummy surface";
goto fail;
}
if (!eglMakeCurrent (edpy,
egl_display->dummy_surface,
egl_display->dummy_surface,
egl_display->egl_context))
{
error_message = "Unable to eglMakeCurrent with dummy surface";
goto fail;
}
#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT)
egl_display->egl_surface =
eglCreateWindowSurface (edpy,
config,
(NativeWindowType) NULL,
NULL);
if (egl_display->egl_surface == EGL_NO_SURFACE)
{
error_message = "Unable to create EGL window surface";
goto fail;
}
if (!eglMakeCurrent (egl_renderer->edpy,
egl_display->egl_surface,
egl_display->egl_surface,
egl_display->egl_context))
{
error_message = "Unable to eglMakeCurrent with egl surface";
goto fail;
}
eglQuerySurface (egl_renderer->edpy,
egl_display->egl_surface,
EGL_WIDTH,
&egl_display->egl_surface_width);
eglQuerySurface (egl_renderer->edpy,
egl_display->egl_surface,
EGL_HEIGHT,
&egl_display->egl_surface_height);
#else
#error "Unknown EGL platform"
#endif
return TRUE;
fail:
/* Currently we only have one fallback path... */
if (retry_cookie == 0)
{
*try_fallback = TRUE;
return FALSE;
}
else
{
*try_fallback = FALSE;
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"%s", error_message);
return FALSE;
}
}
static void
cleanup_context (CoglDisplay *display)
{
CoglDisplayEGL *egl_display = display->winsys;
CoglRendererEGL *egl_renderer = display->renderer->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
CoglDisplayXlib *xlib_display = display->winsys;
CoglRendererXlib *xlib_renderer = display->renderer->winsys;
#endif
if (egl_display->egl_context != EGL_NO_CONTEXT)
{
eglMakeCurrent (egl_renderer->edpy, EGL_NO_SURFACE, EGL_NO_SURFACE,
EGL_NO_CONTEXT);
eglDestroyContext (egl_renderer->edpy, egl_display->egl_context);
egl_display->egl_context = EGL_NO_CONTEXT;
}
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
if (egl_display->dummy_surface != EGL_NO_SURFACE)
{
eglDestroySurface (egl_renderer->edpy, egl_display->dummy_surface);
egl_display->dummy_surface = EGL_NO_SURFACE;
}
if (xlib_display->dummy_xwin)
{
XDestroyWindow (xlib_renderer->xdpy, xlib_display->dummy_xwin);
xlib_display->dummy_xwin = None;
}
#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
if (egl_display->dummy_surface != EGL_NO_SURFACE)
{
eglDestroySurface (egl_renderer->edpy, egl_display->dummy_surface);
egl_display->dummy_surface = EGL_NO_SURFACE;
}
if (egl_display->wayland_egl_native_window)
{
wl_egl_window_destroy (egl_display->wayland_egl_native_window);
egl_display->wayland_egl_native_window = NULL;
}
if (egl_display->wayland_surface)
{
wl_surface_destroy (egl_display->wayland_surface);
egl_display->wayland_surface = NULL;
}
#endif
}
static gboolean
create_context (CoglDisplay *display, GError **error)
{
CoglDisplayEGL *egl_display = display->winsys;
gboolean support_transparent_windows;
int retry_cookie = 0;
gboolean status;
gboolean try_fallback;
GError *try_error = NULL;
g_return_val_if_fail (egl_display->egl_context == NULL, TRUE);
if (display->onscreen_template &&
display->onscreen_template->swap_chain &&
display->onscreen_template->swap_chain->has_alpha)
support_transparent_windows = TRUE;
else
support_transparent_windows = FALSE;
retry_cookie = 0;
while (!(status = try_create_context (display,
retry_cookie,
&try_fallback,
&try_error)) &&
try_fallback)
{
g_error_free (try_error);
cleanup_context (display);
try_error = NULL;
retry_cookie++;
}
if (!status)
g_propagate_error (error, try_error);
return status;
}
static void
_cogl_winsys_display_destroy (CoglDisplay *display)
{
CoglDisplayEGL *egl_display = display->winsys;
g_return_if_fail (egl_display != NULL);
cleanup_context (display);
g_slice_free (CoglDisplayEGL, display->winsys);
display->winsys = NULL;
}
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
static gboolean
gdl_plane_init (CoglDisplay *display, GError **error)
{
gboolean ret = TRUE;
gdl_color_space_t colorSpace = GDL_COLOR_SPACE_RGB;
gdl_rectangle_t dstRect;
gdl_display_info_t display_info;
gdl_ret_t rc = GDL_SUCCESS;
if (!display->gdl_plane)
{
g_set_error (error, COGL_WINSYS_ERROR, COGL_WINSYS_ERROR_CREATE_CONTEXT,
"No GDL plane specified with "
"cogl_gdl_display_set_plane");
return FALSE;
}
rc = gdl_init (NULL);
if (rc != GDL_SUCCESS)
{
g_set_error (error, COGL_WINSYS_ERROR, COGL_WINSYS_ERROR_CREATE_CONTEXT,
"GDL initialize failed. %s", gdl_get_error_string (rc));
return FALSE;
}
rc = gdl_get_display_info (GDL_DISPLAY_ID_0, &display_info);
if (rc != GDL_SUCCESS)
{
g_set_error (error, COGL_WINSYS_ERROR, COGL_WINSYS_ERROR_CREATE_CONTEXT,
"GDL failed to get display infomation: %s",
gdl_get_error_string (rc));
gdl_close ();
return FALSE;
}
dstRect.origin.x = 0;
dstRect.origin.y = 0;
dstRect.width = display_info.tvmode.width;
dstRect.height = display_info.tvmode.height;
/* Configure the plane attribute. */
rc = gdl_plane_reset (plane);
if (rc == GDL_SUCCESS)
rc = gdl_plane_config_begin (plane);
if (rc == GDL_SUCCESS)
rc = gdl_plane_set_attr (GDL_PLANE_SRC_COLOR_SPACE, &colorSpace);
if (rc == GDL_SUCCESS)
rc = gdl_plane_set_attr (GDL_PLANE_PIXEL_FORMAT, &pixfmt);
if (rc == GDL_SUCCESS)
rc = gdl_plane_set_attr (GDL_PLANE_DST_RECT, &dstRect);
if (rc == GDL_SUCCESS)
rc = gdl_plane_set_uint (GDL_PLANE_NUM_GFX_SURFACES,
display->swap_chain->length);
if (rc == GDL_SUCCESS)
rc = gdl_plane_config_end (GDL_FALSE);
else
gdl_plane_config_end (GDL_TRUE);
if (rc != GDL_SUCCESS)
{
g_set_error (error, COGL_WINSYS_ERROR, COGL_WINSYS_ERROR_CREATE_CONTEXT,
"GDL configuration failed: %s.", gdl_get_error_string (rc));
ret = FALSE;
}
gdl_close ();
}
#endif
static gboolean
_cogl_winsys_display_setup (CoglDisplay *display,
GError **error)
{
CoglDisplayEGL *egl_display;
g_return_val_if_fail (display->winsys == NULL, FALSE);
egl_display = g_slice_new0 (CoglDisplayEGL);
display->winsys = egl_display;
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
if (!gdl_plane_init (display, error))
goto error;
#endif
if (!create_context (display, error))
goto error;
egl_display->found_egl_config = TRUE;
return TRUE;
error:
_cogl_winsys_display_destroy (display);
return FALSE;
}
static gboolean
_cogl_winsys_context_init (CoglContext *context, GError **error)
{
context->winsys = g_new0 (CoglContextEGL, 1);
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
cogl_renderer_add_native_filter (context->display->renderer,
event_filter_cb,
context);
#endif
update_winsys_features (context);
return TRUE;
}
static void
_cogl_winsys_context_deinit (CoglContext *context)
{
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
cogl_renderer_remove_native_filter (context->display->renderer,
event_filter_cb,
context);
#endif
g_free (context->winsys);
}
static gboolean
_cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
GError **error)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglDisplay *display = context->display;
CoglDisplayEGL *egl_display = display->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
CoglRendererEGL *egl_renderer = display->renderer->winsys;
CoglRendererXlib *xlib_renderer = display->renderer->winsys;
CoglOnscreenXlib *xlib_onscreen;
Window xwin;
#endif
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
CoglRendererEGL *egl_renderer = display->renderer->winsys;
#endif
CoglOnscreenEGL *egl_onscreen;
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
struct wl_visual *wayland_visual;
#endif
g_return_val_if_fail (egl_display->egl_context, FALSE);
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
/* FIXME: We need to explicitly Select for ConfigureNotify events.
* For foreign windows we need to be careful not to mess up any
* existing event mask.
* We need to document that for windows we create then toolkits
* must be careful not to clear event mask bits that we select.
*/
/* XXX: Note we ignore the user's original width/height when
* given a foreign X window. */
if (onscreen->foreign_xid)
{
Status status;
CoglXlibTrapState state;
XWindowAttributes attr;
int xerror;
xwin = onscreen->foreign_xid;
_cogl_renderer_xlib_trap_errors (display->renderer, &state);
status = XGetWindowAttributes (xlib_renderer->xdpy, xwin, &attr);
xerror = _cogl_renderer_xlib_untrap_errors (display->renderer, &state);
if (status == 0 || xerror)
{
char message[1000];
XGetErrorText (xlib_renderer->xdpy, xerror,
message, sizeof (message));
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"Unable to query geometry of foreign xid 0x%08lX: %s",
xwin, message);
return FALSE;
}
_cogl_framebuffer_winsys_update_size (framebuffer,
attr.width, attr.height);
/* Make sure the app selects for the events we require... */
onscreen->foreign_update_mask_callback (onscreen,
COGL_ONSCREEN_X11_EVENT_MASK,
onscreen->foreign_update_mask_data);
}
else
{
int width;
int height;
CoglXlibTrapState state;
XVisualInfo *xvisinfo;
XSetWindowAttributes xattr;
unsigned long mask;
int xerror;
width = cogl_framebuffer_get_width (framebuffer);
height = cogl_framebuffer_get_height (framebuffer);
_cogl_renderer_xlib_trap_errors (display->renderer, &state);
xvisinfo = get_visual_info (display, egl_display->egl_config);
if (xvisinfo == NULL)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"Unable to retrieve the X11 visual of context's "
"fbconfig");
return FALSE;
}
/* window attributes */
xattr.background_pixel = WhitePixel (xlib_renderer->xdpy,
DefaultScreen (xlib_renderer->xdpy));
xattr.border_pixel = 0;
/* XXX: is this an X resource that we are leaking‽... */
xattr.colormap = XCreateColormap (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
xvisinfo->visual,
AllocNone);
xattr.event_mask = COGL_ONSCREEN_X11_EVENT_MASK;
mask = CWBorderPixel | CWColormap | CWEventMask;
xwin = XCreateWindow (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
0, 0,
width, height,
0,
xvisinfo->depth,
InputOutput,
xvisinfo->visual,
mask, &xattr);
XFree (xvisinfo);
XSync (xlib_renderer->xdpy, False);
xerror = _cogl_renderer_xlib_untrap_errors (display->renderer, &state);
if (xerror)
{
char message[1000];
XGetErrorText (xlib_renderer->xdpy, xerror,
message, sizeof (message));
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"X error while creating Window for CoglOnscreen: %s",
message);
return FALSE;
}
}
#endif
onscreen->winsys = g_slice_new0 (CoglOnscreenEGL);
egl_onscreen = onscreen->winsys;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
xlib_onscreen = onscreen->winsys;
xlib_onscreen->xwin = xwin;
xlib_onscreen->is_foreign_xwin = onscreen->foreign_xid ? TRUE : FALSE;
egl_onscreen->egl_surface =
eglCreateWindowSurface (egl_renderer->edpy,
egl_display->egl_config,
(NativeWindowType) xlib_onscreen->xwin,
NULL);
#elif defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
egl_onscreen->wayland_surface =
wl_compositor_create_surface (egl_renderer->wayland_compositor);
if (!egl_onscreen->wayland_surface)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"Error while creating wayland surface for CoglOnscreen");
return FALSE;
}
wayland_visual =
wl_display_get_premultiplied_argb_visual (egl_renderer->wayland_display);
egl_onscreen->wayland_egl_native_window =
wl_egl_window_create (egl_onscreen->wayland_surface,
cogl_framebuffer_get_width (framebuffer),
cogl_framebuffer_get_height (framebuffer),
wayland_visual);
if (!egl_onscreen->wayland_egl_native_window)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"Error while creating wayland egl native window "
"for CoglOnscreen");
return FALSE;
}
egl_onscreen->egl_surface =
eglCreateWindowSurface (egl_renderer->edpy,
egl_display->egl_config,
(EGLNativeWindowType)
egl_onscreen->wayland_egl_native_window,
NULL);
wl_surface_map_toplevel (egl_onscreen->wayland_surface);
#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT)
if (egl_display->have_onscreen)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"EGL platform only supports a single onscreen window");
return FALSE;
}
egl_onscreen->egl_surface = egl_display->egl_surface;
_cogl_framebuffer_winsys_update_size (framebuffer,
egl_display->egl_surface_width,
egl_display->egl_surface_height);
egl_display->have_onscreen = TRUE;
#else
#error "Unknown EGL platform"
#endif
return TRUE;
}
static void
_cogl_winsys_onscreen_deinit (CoglOnscreen *onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
CoglRendererXlib *xlib_renderer = context->display->renderer->winsys;
CoglXlibTrapState old_state;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT)
CoglDisplayEGL *egl_display = context->display->winsys;
#endif
CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
/* If we never successfully allocated then there's nothing to do */
if (egl_onscreen == NULL)
return;
if (egl_onscreen->egl_surface != EGL_NO_SURFACE)
{
if (eglDestroySurface (egl_renderer->edpy, egl_onscreen->egl_surface)
== EGL_FALSE)
g_warning ("Failed to destroy EGL surface");
egl_onscreen->egl_surface = EGL_NO_SURFACE;
}
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT
egl_display->have_onscreen = FALSE;
#endif
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
_cogl_xlib_trap_errors (&old_state);
if (!xlib_onscreen->is_foreign_xwin && xlib_onscreen->xwin != None)
{
XDestroyWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
xlib_onscreen->xwin = None;
}
else
xlib_onscreen->xwin = None;
XSync (xlib_renderer->xdpy, False);
if (_cogl_xlib_untrap_errors (&old_state) != Success)
g_warning ("X Error while destroying X window");
#endif
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
if (egl_onscreen->wayland_egl_native_window)
{
wl_egl_window_destroy (egl_onscreen->wayland_egl_native_window);
egl_onscreen->wayland_egl_native_window = NULL;
}
if (egl_onscreen->wayland_surface)
{
wl_surface_destroy (egl_onscreen->wayland_surface);
egl_onscreen->wayland_surface = NULL;
}
#endif
g_slice_free (CoglOnscreenEGL, onscreen->winsys);
onscreen->winsys = NULL;
}
static void
_cogl_winsys_onscreen_bind (CoglOnscreen *onscreen)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglContextEGL *egl_context = context->winsys;
CoglDisplayEGL *egl_display = context->display->winsys;
CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
if (egl_context->current_surface == egl_onscreen->egl_surface)
return;
if (G_UNLIKELY (!onscreen))
{
#if defined (COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT) || \
defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
eglMakeCurrent (egl_renderer->edpy,
egl_display->dummy_surface,
egl_display->dummy_surface,
egl_display->egl_context);
egl_context->current_surface = egl_display->dummy_surface;
#elif defined (COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT)
return;
#else
#error "Unknown EGL platform"
#endif
}
else
{
eglMakeCurrent (egl_renderer->edpy,
egl_onscreen->egl_surface,
egl_onscreen->egl_surface,
egl_display->egl_context);
egl_context->current_surface = egl_onscreen->egl_surface;
}
if (onscreen->swap_throttled)
eglSwapInterval (egl_renderer->edpy, 1);
else
eglSwapInterval (egl_renderer->edpy, 0);
}
static void
_cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
int *rectangles,
int n_rectangles)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
if (egl_renderer->pf_eglSwapBuffersRegion (egl_renderer->edpy,
egl_onscreen->egl_surface,
n_rectangles,
rectangles) == EGL_FALSE)
g_warning ("Error reported by eglSwapBuffersRegion");
}
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
static void
_cogl_winsys_onscreen_set_visibility (CoglOnscreen *onscreen,
gboolean visibility)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglRendererXlib *xlib_renderer = context->display->renderer->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
if (visibility)
XMapWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
else
XUnmapWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
}
#endif
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
eglSwapBuffers (egl_renderer->edpy, egl_onscreen->egl_surface);
#if 0
/* XXX: I think really this should be done automatically for
* us in eglSwapBuffers since the spec says eglSwapBuffers
* implicitly flushes client commands. */
while (egl_renderer->wayland_event_mask & WL_DISPLAY_WRITABLE)
wl_display_iterate (egl_renderer->wayland_display,
WL_DISPLAY_WRITABLE);
#endif
}
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
static guint32
_cogl_winsys_onscreen_x11_get_window_xid (CoglOnscreen *onscreen)
{
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
return xlib_onscreen->xwin;
}
#endif
static void
_cogl_winsys_onscreen_update_swap_throttled (CoglOnscreen *onscreen)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglContextEGL *egl_context = context->winsys;
CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
if (egl_context->current_surface != egl_onscreen->egl_surface)
return;
egl_context->current_surface = EGL_NO_SURFACE;
_cogl_winsys_onscreen_bind (onscreen);
}
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
/* XXX: This is a particularly hacky _cogl_winsys interface... */
static XVisualInfo *
_cogl_winsys_xlib_get_visual_info (void)
{
CoglDisplayEGL *egl_display;
_COGL_GET_CONTEXT (ctx, NULL);
g_return_val_if_fail (ctx->display->winsys, FALSE);
egl_display = ctx->display->winsys;
if (!egl_display->found_egl_config)
return NULL;
return get_visual_info (ctx->display, egl_display->egl_config);
}
#endif
static EGLDisplay
_cogl_winsys_context_egl_get_egl_display (CoglContext *context)
{
CoglRendererEGL *egl_renderer = context->display->renderer->winsys;
return egl_renderer->edpy;
}
static CoglWinsysVtable _cogl_winsys_vtable =
{
.name = "EGL",
.get_proc_address = _cogl_winsys_get_proc_address,
.renderer_connect = _cogl_winsys_renderer_connect,
.renderer_disconnect = _cogl_winsys_renderer_disconnect,
.display_setup = _cogl_winsys_display_setup,
.display_destroy = _cogl_winsys_display_destroy,
.context_init = _cogl_winsys_context_init,
.context_deinit = _cogl_winsys_context_deinit,
.context_egl_get_egl_display =
_cogl_winsys_context_egl_get_egl_display,
#ifdef COGL_HAS_XLIB_SUPPORT
.xlib_get_visual_info = _cogl_winsys_xlib_get_visual_info,
#endif
.onscreen_init = _cogl_winsys_onscreen_init,
.onscreen_deinit = _cogl_winsys_onscreen_deinit,
.onscreen_bind = _cogl_winsys_onscreen_bind,
.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers,
.onscreen_swap_region = _cogl_winsys_onscreen_swap_region,
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_X11_SUPPORT
.onscreen_set_visibility = _cogl_winsys_onscreen_set_visibility,
#endif
.onscreen_update_swap_throttled =
_cogl_winsys_onscreen_update_swap_throttled,
#ifdef COGL_HAS_XLIB_SUPPORT
.onscreen_x11_get_window_xid =
_cogl_winsys_onscreen_x11_get_window_xid,
#endif
};
/* XXX: we use a function because no doubt someone will complain
* about using c99 member initializers because they aren't portable
* to windows. We want to avoid having to rigidly follow the real
* order of members since some members are #ifdefd and we'd have
* to mirror the #ifdefing to add padding etc. For any winsys that
* can assume the platform has a sane compiler then we can just use
* c99 initializers for insane platforms they can initialize
* the members by name in a function.
*/
const CoglWinsysVtable *
_cogl_winsys_egl_get_vtable (void)
{
return &_cogl_winsys_vtable;
}
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