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[backend] Abstract the GL context creation

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This is the another step into abstracting the backend operations
that are currently spread all across the board back into the
backend implementations where they belong.

The GL context creation, for instance, is demanded to the stage
realization which makes it a critical path for every operation
that is GL-context bound. This usually does not make any difference
since we realize the default stage, but at some point we might
start looking into avoiding the default stage realization in order
to make the Clutter startup faster.

It also makes the code maintainable because every part is self
contained and can be reworked with the minimum amount of pain.
This commit is contained in:
Emmanuele Bassi 2009-05-13 22:21:48 +01:00
parent 1d7a79f343
commit aa1246e891
5 changed files with 110 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
clutter/clutter-backend.c
View File

@ -300,6 +300,22 @@ _clutter_backend_redraw (ClutterBackend *backend,
klass->redraw (backend, stage);
}
gboolean
_clutter_backend_create_context (ClutterBackend *backend,
gboolean is_offscreen,
GError **error)
{
ClutterBackendClass *klass;
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), FALSE);
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->create_context)
return klass->create_context (backend, is_offscreen, error);
return TRUE;
}
void
_clutter_backend_ensure_context (ClutterBackend *backend,
ClutterStage *stage)

3
clutter/clutter-backend.h
View File

@ -77,6 +77,9 @@ struct _ClutterBackendClass
ClutterFeatureFlags (* get_features) (ClutterBackend *backend);
void (* redraw) (ClutterBackend *backend,
ClutterStage *stage);
gboolean (* create_context) (ClutterBackend *backend,
gboolean is_offscreen,
GError **error);
void (* ensure_context) (ClutterBackend *backend,
ClutterStage *stage);

3
clutter/clutter-private.h
View File

@ -184,6 +184,9 @@ ClutterActor *_clutter_backend_create_stage (ClutterBackend *backend,
GError **error);
void _clutter_backend_ensure_context (ClutterBackend *backend,
ClutterStage *stage);
gboolean _clutter_backend_create_context (ClutterBackend *backend,
gboolean is_offscreen,
GError **error);
void _clutter_backend_add_options (ClutterBackend *backend,
GOptionGroup *group);

54
clutter/glx/clutter-backend-glx.c
View File

@ -354,6 +354,57 @@ clutter_backend_glx_get_features (ClutterBackend *backend)
return flags;
}
static gboolean
clutter_backend_glx_create_context (ClutterBackend *backend,
gboolean is_offscreen,
GError **error)
{
ClutterBackendGLX *backend_glx = CLUTTER_BACKEND_GLX (backend);
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
if (backend_glx->gl_context == None)
{
XVisualInfo *xvisinfo;
xvisinfo =
clutter_backend_x11_get_visual_info (backend_x11, is_offscreen);
CLUTTER_NOTE (GL, "Creating GL Context (display: %p, %s)",
backend_x11->xdpy,
is_offscreen ? "offscreen" : "onscreen");
backend_glx->gl_context = glXCreateContext (backend_x11->xdpy,
xvisinfo,
0,
is_offscreen ? False : True);
XFree (xvisinfo);
if (backend_glx->gl_context == None)
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to create suitable %s GL context",
is_offscreen ? "offscreen" : "onscreen");
return FALSE;
}
if (!is_offscreen)
{
gboolean is_direct;
is_direct = glXIsDirect (backend_x11->xdpy,
backend_glx->gl_context);
CLUTTER_NOTE (GL, "Setting %s context",
is_direct ? "direct" : "indirect");
_cogl_set_indirect_context (!is_direct);
}
}
return TRUE;
}
static void
clutter_backend_glx_ensure_context (ClutterBackend *backend,
ClutterStage *stage)
@ -469,7 +520,7 @@ clutter_backend_glx_redraw (ClutterBackend *backend,
}
}
static ClutterActor*
static ClutterActor *
clutter_backend_glx_create_stage (ClutterBackend *backend,
ClutterStage *wrapper,
GError **error)
@ -563,6 +614,7 @@ clutter_backend_glx_class_init (ClutterBackendGLXClass *klass)
backend_class->add_options = clutter_backend_glx_add_options;
backend_class->get_features = clutter_backend_glx_get_features;
backend_class->redraw = clutter_backend_glx_redraw;
backend_class->create_context = clutter_backend_glx_create_context;
backend_class->ensure_context = clutter_backend_glx_ensure_context;
backendx11_class->get_visual_info = clutter_backend_glx_get_visual_info;

76
clutter/glx/clutter-stage-glx.c
View File

@ -97,6 +97,12 @@ clutter_stage_glx_unrealize (ClutterActor *actor)
stage_x11->xwin = None;
}
if (stage_x11->xvisinfo != None)
{
XFree (stage_x11->xvisinfo);
stage_x11->xvisinfo = None;
}
XSync (stage_x11->xdpy, False);
clutter_x11_untrap_x_errors ();
@ -109,6 +115,7 @@ clutter_stage_glx_realize (ClutterActor *actor)
{
ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (actor);
ClutterStageGLX *stage_glx = CLUTTER_STAGE_GLX (actor);
ClutterBackend *backend;
ClutterBackendGLX *backend_glx;
ClutterBackendX11 *backend_x11;
gboolean is_offscreen;
@ -119,19 +126,17 @@ clutter_stage_glx_realize (ClutterActor *actor)
g_object_get (stage_x11->wrapper, "offscreen", &is_offscreen, NULL);
backend_glx = CLUTTER_BACKEND_GLX (clutter_get_default_backend ());
backend_x11 = CLUTTER_BACKEND_X11 (clutter_get_default_backend ());
backend = clutter_get_default_backend ();
backend_glx = CLUTTER_BACKEND_GLX (backend);
backend_x11 = CLUTTER_BACKEND_X11 (backend);
if (G_LIKELY (!is_offscreen))
{
if (stage_x11->xvisinfo != None)
{
XFree (stage_x11->xvisinfo);
stage_x11->xvisinfo = None;
}
GError *error;
stage_x11->xvisinfo =
clutter_backend_x11_get_visual_info (backend_x11, FALSE);
if (stage_x11->xvisinfo == None)
{
g_critical ("Unable to find suitable GL visual.");
@ -197,22 +202,14 @@ clutter_stage_glx_realize (ClutterActor *actor)
clutter_stage_x11_fix_window_size (stage_x11);
clutter_stage_x11_set_wm_protocols (stage_x11);
if (G_UNLIKELY (backend_glx->gl_context == None))
/* ask for a context; a no-op, if a context already exists */
error = NULL;
_clutter_backend_create_context (backend, FALSE, &error);
if (error)
{
CLUTTER_NOTE (GL, "Creating GL Context");
backend_glx->gl_context = glXCreateContext (stage_x11->xdpy,
stage_x11->xvisinfo,
0,
True);
if (backend_glx->gl_context == None)
{
g_critical ("Unable to create suitable GL context.");
goto fail;
}
_cogl_set_indirect_context (!glXIsDirect (stage_x11->xdpy,
backend_glx->gl_context));
g_critical ("Unable to realize stage: %s", error->message);
g_error_free (error);
goto fail;
}
CLUTTER_NOTE (BACKEND, "Marking stage as realized");
@ -220,6 +217,8 @@ clutter_stage_glx_realize (ClutterActor *actor)
}
else
{
GError *error;
if (stage_x11->xvisinfo != None)
{
XFree (stage_x11->xvisinfo);
@ -228,13 +227,13 @@ clutter_stage_glx_realize (ClutterActor *actor)
stage_x11->xvisinfo =
clutter_backend_x11_get_visual_info (backend_x11, TRUE);
if (stage_x11->xvisinfo == None)
{
g_critical ("Unable to find suitable GL visual.");
goto fail;
}
stage_x11->xpixmap = XCreatePixmap (stage_x11->xdpy,
stage_x11->xwin_root,
stage_x11->xwin_width,
@ -246,25 +245,20 @@ clutter_stage_glx_realize (ClutterActor *actor)
stage_x11->xvisinfo,
stage_x11->xpixmap);
if (backend_glx->gl_context == None)
/* ask for a context; a no-op, if a context already exists
*
* FIXME: we probably need a seperate offscreen context here
* - though it likely makes most sense to drop offscreen stages
* and rely on FBO's instead and GLXPixmaps seems mostly broken
* anyway..
*/
error = NULL;
_clutter_backend_create_context (backend, TRUE, &error);
if (error)
{
CLUTTER_NOTE (GL, "Creating GL Context");
/* FIXME: we probably need a seperate offscreen context here
* - though it likely makes most sense to drop offscreen stages
* and rely on FBO's instead and GLXPixmaps seems mostly broken
* anyway..
*/
backend_glx->gl_context = glXCreateContext (stage_x11->xdpy,
stage_x11->xvisinfo,
0,
False);
if (backend_glx->gl_context == None)
{
g_critical ("Unable to create suitable GL context.");
goto fail;
}
g_critical ("Unable to realize stage: %s", error->message);
g_error_free (error);
goto fail;
}
CLUTTER_NOTE (BACKEND, "Marking stage as realized");