mutter/clutter/eglnative/clutter-backend-egl.c

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "clutter-backend-egl.h"
#include "clutter-stage-egl.h"
#include "../clutter-private.h"
#include "../clutter-main.h"
#include "../clutter-debug.h"
static ClutterBackendEGL *backend_singleton = NULL;
static const gchar *clutter_fb_device = NULL;
G_DEFINE_TYPE (ClutterBackendEGL, clutter_backend_egl, CLUTTER_TYPE_BACKEND);
static void
clutter_backend_at_exit (void)
{
if (backend_singleton)
g_object_run_dispose (G_OBJECT (backend_singleton));
}
static gboolean
clutter_backend_egl_pre_parse (ClutterBackend *backend,
GError **error)
{
const gchar *env_string;
env_string = g_getenv ("CLUTTER_FB_DEVICE");
if (env_string != NULL && env_string[0] != '\0')
clutter_fb_device = g_strdup (env_string);
return TRUE;
}
static gboolean
clutter_backend_egl_post_parse (ClutterBackend *backend,
GError **error)
{
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ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL(backend);
EGLBoolean status;
backend_egl->edpy = eglGetDisplay (EGL_DEFAULT_DISPLAY);
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 void
clutter_backend_egl_ensure_context (ClutterBackend *backend,
ClutterStage *stage)
{
/* not doing anything since we only have one context and
* it is permanently made current
*/
}
static gboolean
clutter_backend_egl_create_context (ClutterBackend *backend,
GError **error)
{
ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
EGLConfig configs[2];
EGLint config_count;
EGLBoolean status;
EGLint cfg_attribs[] = {
EGL_BUFFER_SIZE, EGL_DONT_CARE,
EGL_RED_SIZE, 5,
EGL_GREEN_SIZE, 6,
EGL_BLUE_SIZE, 5,
EGL_DEPTH_SIZE, 16,
EGL_ALPHA_SIZE, EGL_DONT_CARE,
EGL_STENCIL_SIZE, 2,
#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
};
if (backend_egl->egl_context)
return TRUE;
status = eglGetConfigs (backend_egl->edpy,
configs,
2,
&config_count);
if (status != EGL_TRUE)
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"No EGL configurations found");
return FALSE;
}
status = eglChooseConfig (backend_egl->edpy,
cfg_attribs,
configs,
G_N_ELEMENTS (configs),
&config_count);
if (status != EGL_TRUE)
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to select a valid EGL configuration");
return FALSE;
}
CLUTTER_NOTE (BACKEND, "Got %i configs", config_count);
if (G_UNLIKELY (backend_egl->egl_surface != EGL_NO_SURFACE))
{
eglDestroySurface (backend_egl->edpy, backend_egl->egl_surface);
backend_egl->egl_surface = EGL_NO_SURFACE;
}
if (G_UNLIKELY (backend_egl->egl_context != NULL))
{
eglDestroyContext (backend_egl->edpy, backend_egl->egl_context);
backend_egl->egl_context = NULL;
}
if (clutter_fb_device != NULL)
{
int fd = open (clutter_fb_device, O_RDWR);
if (fd < 0)
{
int errno_save = errno;
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to open the framebuffer device '%s': %s",
clutter_fb_device,
g_strerror (errno_save));
return FALSE;
}
else
backend_egl->fb_device_id = fd;
backend_egl->egl_surface =
eglCreateWindowSurface (backend_egl->edpy,
configs[0],
(NativeWindowType) backend_egl->fb_device_id,
NULL);
}
else
{
backend_egl->egl_surface =
eglCreateWindowSurface (backend_egl->edpy,
configs[0],
NULL,
NULL);
}
if (backend_egl->egl_surface == EGL_NO_SURFACE)
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to create EGL window surface");
return FALSE;
}
#ifdef HAVE_COGL_GLES2
{
static const EGLint attribs[3] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
backend_egl->egl_context = eglCreateContext (backend_egl->edpy,
configs[0],
EGL_NO_CONTEXT,
attribs);
}
#else
/* Seems some GLES implementations 1.x do not like attribs... */
backend_egl->egl_context = eglCreateContext (backend_egl->edpy,
configs[0],
EGL_NO_CONTEXT,
NULL);
#endif
if (backend_egl->egl_context == EGL_NO_CONTEXT)
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to create a suitable EGL context");
return FALSE;
}
CLUTTER_NOTE (GL, "Created EGL Context");
CLUTTER_NOTE (BACKEND, "Setting context");
/* eglnative can have only one stage, so we store the EGL surface
* in the backend itself, instead of the StageWindow implementation,
* and we make it current immediately to make sure the Cogl and
* Clutter can query the EGL context for features.
*/
status = eglMakeCurrent (backend_egl->edpy,
backend_egl->egl_surface,
backend_egl->egl_surface,
backend_egl->egl_context);
eglQuerySurface (backend_egl->edpy,
backend_egl->egl_surface,
EGL_WIDTH,
&backend_egl->surface_width);
eglQuerySurface (backend_egl->edpy,
backend_egl->egl_surface,
EGL_HEIGHT,
&backend_egl->surface_height);
CLUTTER_NOTE (BACKEND, "EGL surface is %ix%i",
backend_egl->surface_width,
backend_egl->surface_height);
return TRUE;
}
static void
clutter_backend_egl_redraw (ClutterBackend *backend,
ClutterStage *stage)
{
ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
ClutterStageEGL *stage_egl;
ClutterStageWindow *impl;
impl = _clutter_stage_get_window (stage);
if (impl == NULL)
return;
g_assert (CLUTTER_IS_STAGE_EGL (impl));
stage_egl = CLUTTER_STAGE_EGL (impl);
eglWaitNative (EGL_CORE_NATIVE_ENGINE);
clutter_actor_paint (CLUTTER_ACTOR (stage_egl->wrapper));
cogl_flush ();
eglWaitGL();
eglSwapBuffers (backend_egl->edpy, backend_egl->egl_surface);
}
static ClutterStageWindow *
clutter_backend_egl_create_stage (ClutterBackend *backend,
ClutterStage *wrapper,
GError **error)
{
ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
ClutterStageEGL *stage_egl;
ClutterStageWindow *stage;
if (G_UNLIKELY (backend_egl->stage != NULL))
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"The EGL native backend does not support multiple stages");
return backend_egl->stage;
}
stage = g_object_new (CLUTTER_TYPE_STAGE_EGL, NULL);
stage_egl = CLUTTER_STAGE_EGL (stage);
stage_egl->backend = backend_egl;
stage_egl->wrapper = wrapper;
backend_egl->stage = stage;
return stage;
}
static void
clutter_backend_egl_init_events (ClutterBackend *backend)
{
_clutter_events_egl_init (CLUTTER_BACKEND_EGL (backend));
}
static const GOptionEntry entries[] =
{
{ NULL }
};
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);
ClutterStageEGL *stage_egl = CLUTTER_STAGE_EGL (backend_egl->stage);
_clutter_events_egl_uninit (backend_egl);
if (backend_egl->stage != NULL)
{
clutter_actor_destroy (CLUTTER_ACTOR (stage_egl->wrapper));
backend_egl->stage = NULL;
}
if (backend_egl->egl_surface != EGL_NO_SURFACE)
{
eglDestroySurface (backend_egl->edpy, backend_egl->egl_surface);
backend_egl->egl_surface = EGL_NO_SURFACE;
}
if (backend_egl->fb_device_id != -1)
{
close (backend_egl->fb_device_id);
backend_egl->fb_device_id = -1;
}
if (backend_egl->egl_context != NULL)
{
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;
}
if (backend_egl->event_timer != NULL)
{
g_timer_destroy (backend_egl->event_timer);
backend_egl->event_timer = NULL;
}
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);
g_assert (backend_egl->egl_context != NULL);
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 CLUTTER_FEATURE_STAGE_STATIC;
}
static void
clutter_backend_egl_class_init (ClutterBackendEGLClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBackendClass *backend_class = CLUTTER_BACKEND_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->pre_parse = clutter_backend_egl_pre_parse;
backend_class->post_parse = clutter_backend_egl_post_parse;
backend_class->init_events = clutter_backend_egl_init_events;
backend_class->create_stage = clutter_backend_egl_create_stage;
backend_class->create_context = clutter_backend_egl_create_context;
backend_class->ensure_context = clutter_backend_egl_ensure_context;
backend_class->redraw = clutter_backend_egl_redraw;
backend_class->get_features = clutter_backend_egl_get_features;
}
static void
clutter_backend_egl_init (ClutterBackendEGL *backend_egl)
{
ClutterBackend *backend = CLUTTER_BACKEND (backend_egl);
clutter_backend_set_resolution (backend, 96.0);
clutter_backend_set_double_click_time (backend, 250);
clutter_backend_set_double_click_distance (backend, 5);
backend_egl->event_timer = g_timer_new ();
backend_egl->fb_device_id = -1;
}
GType
_clutter_backend_impl_get_type (void)
{
return clutter_backend_egl_get_type ();
}
/**
* clutter_egl_display:
*
* Retrieves the <structname>EGLDisplay</structname> used by Clutter
*
* Return value: the EGL display
*/
EGLDisplay
clutter_egl_display (void)
{
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return backend_singleton->edpy;
}