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mutter-performance-source/clutter/eglx/clutter-backend-egl.c
Neil Roberts 26b061c3a8 clutter-backend-egl: Create a dummy X window and EGL surface 
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
2010-05-18 15:05:36 +01:00

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-backend-egl.h"
#include "clutter-stage-egl.h"
#include "../clutter-private.h"
#include "../clutter-main.h"
#include "../clutter-debug.h"
#include "../clutter-version.h"
static ClutterBackendEGL *backend_singleton = NULL;
G_DEFINE_TYPE (ClutterBackendEGL, clutter_backend_egl, CLUTTER_TYPE_BACKEND_X11);
static void
clutter_backend_at_exit (void)
{
if (backend_singleton)
g_object_run_dispose (G_OBJECT (backend_singleton));
}
static gboolean
clutter_backend_egl_post_parse (ClutterBackend *backend,
GError **error)
{
ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
if (clutter_backend_x11_post_parse (backend, error))
{
EGLBoolean status;
backend_egl->edpy =
eglGetDisplay ((EGLNativeDisplayType) backend_x11->xdpy);
status = eglInitialize (backend_egl->edpy,
&backend_egl->egl_version_major,
&backend_egl->egl_version_minor);
g_atexit (clutter_backend_at_exit);
if (status != EGL_TRUE)
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to Initialize EGL");
return FALSE;
}
}
CLUTTER_NOTE (BACKEND, "EGL Reports version %i.%i",
backend_egl->egl_version_major,
backend_egl->egl_version_minor);
return TRUE;
}
static gboolean
clutter_backend_egl_create_context (ClutterBackend *backend,
GError **error)
{
ClutterBackendEGL *backend_egl;
ClutterBackendX11 *backend_x11;
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, 8,
EGL_RED_SIZE, 5,
EGL_GREEN_SIZE, 6,
EGL_BLUE_SIZE, 5,
EGL_BUFFER_SIZE, EGL_DONT_CARE,
#ifdef HAVE_COGL_GLES2
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
#else /* HAVE_COGL_GLES2 */
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
#endif /* HAVE_COGL_GLES2 */
EGL_NONE
};
EGLDisplay edpy;
gint retry_cookie = 0;
XVisualInfo *xvisinfo;
XSetWindowAttributes attrs;
backend = clutter_get_default_backend ();
backend_egl = CLUTTER_BACKEND_EGL (backend);
if (backend_egl->egl_context != EGL_NO_CONTEXT)
return TRUE;
backend_x11 = CLUTTER_BACKEND_X11 (backend);
edpy = clutter_eglx_display ();
retry:
/* Here we can change the attributes depending on the fallback count... */
/* 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)
{
g_warning ("eglChooseConfig failed");
goto fail;
}
if (G_UNLIKELY (backend_egl->egl_context == EGL_NO_CONTEXT))
{
#ifdef HAVE_COGL_GLES2
static const EGLint attribs[3]
= { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
backend_egl->egl_context = eglCreateContext (edpy,
config,
EGL_NO_CONTEXT,
attribs);
#else
/* Seems some GLES implementations 1.x do not like attribs... */
backend_egl->egl_context = eglCreateContext (edpy,
config,
EGL_NO_CONTEXT,
NULL);
#endif
if (backend_egl->egl_context == EGL_NO_CONTEXT)
{
g_warning ("Unable to create a suitable EGL context");
goto fail;
}
backend_egl->egl_config = config;
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:
/* NB: We currently only support a single fallback option */
if (retry_cookie == 0)
{
retry_cookie = 1;
goto retry;
}
return FALSE;
}
static void
clutter_backend_egl_ensure_context (ClutterBackend *backend,
ClutterStage *stage)
{
ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
ClutterStageWindow *impl;
if (stage == NULL ||
(CLUTTER_PRIVATE_FLAGS (stage) & CLUTTER_ACTOR_IN_DESTRUCTION) ||
((impl = _clutter_stage_get_window (stage)) == NULL))
{
CLUTTER_NOTE (BACKEND, "Clearing EGL context");
eglMakeCurrent (backend_egl->edpy,
EGL_NO_SURFACE,
EGL_NO_SURFACE,
EGL_NO_CONTEXT);
}
else
{
ClutterStageEGL *stage_egl;
ClutterStageX11 *stage_x11;
g_assert (impl != NULL);
CLUTTER_NOTE (MULTISTAGE, "Setting context for stage of type %s [%p]",
g_type_name (G_OBJECT_TYPE (impl)),
impl);
stage_egl = CLUTTER_STAGE_EGL (impl);
stage_x11 = CLUTTER_STAGE_X11 (impl);
if (backend_egl->egl_context == EGL_NO_CONTEXT)
return;
clutter_x11_trap_x_errors ();
/* we might get here inside the final dispose cycle, so we
* need to handle this gracefully
*/
if (stage_x11->xwin == None ||
stage_egl->egl_surface == EGL_NO_SURFACE)
{
CLUTTER_NOTE (MULTISTAGE,
"Received a stale stage, clearing all 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
{
CLUTTER_NOTE (MULTISTAGE, "Setting real surface current");
eglMakeCurrent (backend_egl->edpy,
stage_egl->egl_surface,
stage_egl->egl_surface,
backend_egl->egl_context);
}
if (clutter_x11_untrap_x_errors ())
g_critical ("Unable to make the stage window 0x%x the current "
"EGLX drawable",
(int) stage_x11->xwin);
}
}
static void
clutter_backend_egl_redraw (ClutterBackend *backend,
ClutterStage *stage)
{
ClutterStageWindow *impl;
impl = _clutter_stage_get_window (stage);
if (!impl)
return;
g_assert (CLUTTER_IS_STAGE_EGL (impl));
clutter_stage_egl_redraw (CLUTTER_STAGE_EGL (impl), stage);
}
static void
clutter_backend_egl_finalize (GObject *gobject)
{
if (backend_singleton)
backend_singleton = NULL;
G_OBJECT_CLASS (clutter_backend_egl_parent_class)->finalize (gobject);
}
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)
{
eglDestroyContext (backend_egl->edpy, backend_egl->egl_context);
backend_egl->egl_context = NULL;
}
if (backend_egl->edpy)
{
eglTerminate (backend_egl->edpy);
backend_egl->edpy = 0;
}
G_OBJECT_CLASS (clutter_backend_egl_parent_class)->dispose (gobject);
}
static GObject *
clutter_backend_egl_constructor (GType gtype,
guint n_params,
GObjectConstructParam *params)
{
GObjectClass *parent_class;
GObject *retval;
if (!backend_singleton)
{
parent_class = G_OBJECT_CLASS (clutter_backend_egl_parent_class);
retval = parent_class->constructor (gtype, n_params, params);
backend_singleton = CLUTTER_BACKEND_EGL (retval);
return retval;
}
g_warning ("Attempting to create a new backend object. This should "
"never happen, so we return the singleton instance.");
return g_object_ref (backend_singleton);
}
static ClutterFeatureFlags
clutter_backend_egl_get_features (ClutterBackend *backend)
{
ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
ClutterFeatureFlags flags;
flags = clutter_backend_x11_get_features (backend);
flags |= CLUTTER_FEATURE_STAGE_MULTIPLE;
CLUTTER_NOTE (BACKEND, "Checking features\n"
"GL_VENDOR: %s\n"
"GL_RENDERER: %s\n"
"GL_VERSION: %s\n"
"EGL_VENDOR: %s\n"
"EGL_VERSION: %s\n"
"EGL_EXTENSIONS: %s\n",
glGetString (GL_VENDOR),
glGetString (GL_RENDERER),
glGetString (GL_VERSION),
eglQueryString (backend_egl->edpy, EGL_VENDOR),
eglQueryString (backend_egl->edpy, EGL_VERSION),
eglQueryString (backend_egl->edpy, EGL_EXTENSIONS));
return flags;
}
static ClutterStageWindow *
clutter_backend_egl_create_stage (ClutterBackend *backend,
ClutterStage *wrapper,
GError **error)
{
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
ClutterStageX11 *stage_x11;
ClutterStageWindow *stage;
CLUTTER_NOTE (BACKEND, "Creating stage of type '%s'",
g_type_name (CLUTTER_STAGE_TYPE));
stage = g_object_new (CLUTTER_TYPE_STAGE_EGL, NULL);
/* copy backend data into the stage */
stage_x11 = CLUTTER_STAGE_X11 (stage);
stage_x11->wrapper = wrapper;
CLUTTER_NOTE (MISC, "EGLX stage created (display:%p, screen:%d, root:%u)",
backend_x11->xdpy,
backend_x11->xscreen_num,
(unsigned int) backend_x11->xwin_root);
return stage;
}
static XVisualInfo *
clutter_backend_egl_get_visual_info (ClutterBackendX11 *backend_x11)
{
ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend_x11);
EGLint visualid;
XVisualInfo visinfo_template;
XVisualInfo *visinfo = None;
int visinfos_count;
if (!clutter_backend_egl_create_context (CLUTTER_BACKEND (backend_x11), NULL))
return NULL;
eglGetConfigAttrib (backend_egl->edpy, backend_egl->egl_config,
EGL_NATIVE_VISUAL_ID, &visualid);
visinfo_template.screen = backend_x11->xscreen_num;
visinfo_template.visualid = visualid;
visinfo = XGetVisualInfo (backend_x11->xdpy,
VisualScreenMask | VisualIDMask,
&visinfo_template,
&visinfos_count);
if (!visinfo)
return None;
return visinfo;
}
static void
clutter_backend_egl_class_init (ClutterBackendEGLClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass);
ClutterBackendX11Class *backendx11_class = CLUTTER_BACKEND_X11_CLASS (klass);
gobject_class->constructor = clutter_backend_egl_constructor;
gobject_class->dispose = clutter_backend_egl_dispose;
gobject_class->finalize = clutter_backend_egl_finalize;
backend_class->post_parse = clutter_backend_egl_post_parse;
backend_class->redraw = clutter_backend_egl_redraw;
backend_class->get_features = clutter_backend_egl_get_features;
backend_class->create_stage = clutter_backend_egl_create_stage;
backend_class->ensure_context = clutter_backend_egl_ensure_context;
backend_class->create_context = clutter_backend_egl_create_context;
backendx11_class->get_visual_info = clutter_backend_egl_get_visual_info;
}
static void
clutter_backend_egl_init (ClutterBackendEGL *backend_egl)
{
backend_egl->egl_context = EGL_NO_CONTEXT;
backend_egl->dummy_surface = EGL_NO_SURFACE;
}
GType
_clutter_backend_impl_get_type (void)
{
return clutter_backend_egl_get_type ();
}
/**
* clutter_eglx_display:
*
* Gets the current EGLDisplay.
*
* Return value: an EGLDisplay
*
* Since: 0.4
*/
EGLDisplay
clutter_eglx_display (void)
{
return backend_singleton->edpy;
}
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