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clutter-backend-egl: Create a dummy X window and EGL surface

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After the EGL context is created it now also creates an invisible 1x1
window and a corresponding surface so that the context can be
immediately made current. This is similar to changes for the GLX
backend introduced in d2c091e62.

http://bugzilla.openedhand.com/show_bug.cgi?id=2056
This commit is contained in:
Neil Roberts 2010-05-05 17:30:00 +01:00
parent e2a990dfd5
commit 26b061c3a8
2 changed files with 78 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
clutter/eglx/clutter-backend-egl.c
View File

@ -87,6 +87,8 @@ clutter_backend_egl_create_context (ClutterBackend *backend,
};
EGLDisplay edpy;
gint retry_cookie = 0;
XVisualInfo *xvisinfo;
XSetWindowAttributes attrs;
backend = clutter_get_default_backend ();
backend_egl = CLUTTER_BACKEND_EGL (backend);
@ -147,6 +149,56 @@ retry:
CLUTTER_NOTE (GL, "Created EGL Context");
}
/* COGL assumes that there is always a GL context selected; in order
* to make sure that an EGL context exists and is made current, we use
* a dummy, offscreen override-redirect window to which we can always
* fall back if no stage is available */
xvisinfo = clutter_backend_x11_get_visual_info (backend_x11);
if (xvisinfo == NULL)
{
g_critical ("Unable to find suitable GL visual.");
return FALSE;
}
attrs.override_redirect = True;
attrs.colormap = XCreateColormap (backend_x11->xdpy,
backend_x11->xwin_root,
xvisinfo->visual,
AllocNone);
attrs.border_pixel = 0;
backend_egl->dummy_xwin = XCreateWindow (backend_x11->xdpy,
backend_x11->xwin_root,
-100, -100, 1, 1,
0,
xvisinfo->depth,
CopyFromParent,
xvisinfo->visual,
CWOverrideRedirect |
CWColormap |
CWBorderPixel,
&attrs);
XFree (xvisinfo);
backend_egl->dummy_surface =
eglCreateWindowSurface (edpy,
backend_egl->egl_config,
(EGLNativeWindowType) backend_egl->dummy_xwin,
NULL);
if (backend_egl->dummy_surface == EGL_NO_SURFACE)
{
g_critical ("Unable to create an EGL surface");
return FALSE;
}
eglMakeCurrent (edpy,
backend_egl->dummy_surface,
backend_egl->dummy_surface,
backend_egl->egl_context);
return TRUE;
fail:
@ -206,10 +258,16 @@ clutter_backend_egl_ensure_context (ClutterBackend *backend,
CLUTTER_NOTE (MULTISTAGE,
"Received a stale stage, clearing all context");
eglMakeCurrent (backend_egl->edpy,
EGL_NO_SURFACE,
EGL_NO_SURFACE,
EGL_NO_CONTEXT);
if (backend_egl->dummy_surface == EGL_NO_SURFACE)
eglMakeCurrent (backend_egl->edpy,
EGL_NO_SURFACE,
EGL_NO_SURFACE,
EGL_NO_CONTEXT);
else
eglMakeCurrent (backend_egl->edpy,
backend_egl->dummy_surface,
backend_egl->dummy_surface,
backend_egl->egl_context);
}
else
{
@ -255,6 +313,19 @@ static void
clutter_backend_egl_dispose (GObject *gobject)
{
ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (gobject);
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (gobject);
if (backend_egl->dummy_surface != EGL_NO_SURFACE)
{
eglDestroySurface (backend_egl->edpy, backend_egl->dummy_surface);
backend_egl->dummy_surface = EGL_NO_SURFACE;
}
if (backend_egl->dummy_xwin)
{
XDestroyWindow (backend_x11->xdpy, backend_egl->dummy_xwin);
backend_egl->dummy_xwin = None;
}
if (backend_egl->egl_context)
{
@ -398,6 +469,7 @@ static void
clutter_backend_egl_init (ClutterBackendEGL *backend_egl)
{
backend_egl->egl_context = EGL_NO_CONTEXT;
backend_egl->dummy_surface = EGL_NO_SURFACE;
}
GType

2
clutter/eglx/clutter-backend-egl.h
View File

@ -53,6 +53,8 @@ struct _ClutterBackendEGL
EGLDisplay edpy;
EGLContext egl_context;
EGLConfig egl_config;
Window dummy_xwin;
EGLSurface dummy_surface;
gint egl_version_major;
gint egl_version_minor;