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cogl-crate: Optionally use the swap buffers notify mechanism

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If the swap buffers notify mechanism is advertised then the crate
example will now register a callback for it and call g_poll with the
proper timeout from cogl_context_begin_idle instead of trying to
repaint continuously.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts 2011-12-19 19:29:47 +00:00 committed by Robert Bragg
parent cbbac5a2f5
commit e28db24f7d
1 changed files with 39 additions and 3 deletions
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42
examples/cogl-crate.c
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@ -24,6 +24,8 @@ typedef struct _Data
GTimer *timer; GTimer *timer;
gboolean swap_ready;
} Data; } Data;
/* A static identity matrix initialized for convenience. */ /* A static identity matrix initialized for convenience. */
@ -133,6 +135,15 @@ paint (Data *data)
&white, 0); &white, 0);
} }
static void
swap_notify_cb (CoglFramebuffer *framebuffer,
void *user_data)
{
Data *data = user_data;
data->swap_ready = TRUE;
}
int int
main (int argc, char **argv) main (int argc, char **argv)
{ {
@ -144,6 +155,7 @@ main (int argc, char **argv)
PangoRectangle hello_label_size; PangoRectangle hello_label_size;
float fovy, aspect, z_near, z_2d, z_far; float fovy, aspect, z_near, z_2d, z_far;
CoglDepthState depth_state; CoglDepthState depth_state;
gboolean has_swap_notify;
g_type_init (); g_type_init ();
@ -270,17 +282,41 @@ main (int argc, char **argv)
cogl_push_framebuffer (fb); cogl_push_framebuffer (fb);
data.swap_ready = TRUE;
has_swap_notify =
cogl_has_feature (ctx, COGL_FEATURE_ID_SWAP_BUFFERS_EVENT);
if (has_swap_notify)
cogl_framebuffer_add_swap_buffers_callback (fb,
swap_notify_cb,
&data);
while (1) while (1)
{ {
CoglPollFD *poll_fds; CoglPollFD *poll_fds;
int n_poll_fds; int n_poll_fds;
gint64 timeout; gint64 timeout;
paint (&data); if (data.swap_ready)
cogl_framebuffer_swap_buffers (fb); {
paint (&data);
cogl_framebuffer_swap_buffers (fb);
}
cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout); cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout);
g_poll ((GPollFD *) poll_fds, n_poll_fds, 0);
if (!has_swap_notify)
{
/* If the winsys doesn't support swap event notification
then we'll just redraw constantly */
data.swap_ready = TRUE;
timeout = 0;
}
g_poll ((GPollFD *) poll_fds, n_poll_fds,
timeout == -1 ? -1 : timeout / 1000);
cogl_poll_dispatch (ctx, poll_fds, n_poll_fds); cogl_poll_dispatch (ctx, poll_fds, n_poll_fds);
} }