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kms-winsys: try to hobble along if driver doesn't support page flips

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Some drivers ( like mgag200 ) don't yet support drmModePageFlip.

This commit forgoes waiting for vblank and flips right away
in those cases. That prevents the hardware from freezing up the screen,
but does mean there will be some visible tearing.

https://bugzilla.gnome.org/show_bug.cgi?id=746042
This commit is contained in:
Ray Strode 2015-03-11 12:09:51 -04:00
parent 44e94c505a
commit 68d9ba3b65
1 changed files with 39 additions and 13 deletions
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44
cogl/winsys/cogl-winsys-egl-kms.c
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@ -72,6 +72,7 @@ typedef struct _CoglRendererKMS
int opened_fd;
struct gbm_device *gbm;
CoglClosure *swap_notify_idle;
CoglBool page_flips_not_supported;
} CoglRendererKMS;
typedef struct _CoglOutputKMS
@ -224,14 +225,8 @@ queue_swap_notify_for_onscreen (CoglOnscreen *onscreen)
}
static void
page_flip_handler (int fd,
unsigned int frame,
unsigned int sec,
unsigned int usec,
void *data)
process_flip (CoglFlipKMS *flip)
{
CoglFlipKMS *flip = data;
/* We're only ready to dispatch a swap notification once all outputs
* have flipped... */
flip->pending--;
@ -257,11 +252,26 @@ page_flip_handler (int fd,
}
}
static void
page_flip_handler (int fd,
unsigned int frame,
unsigned int sec,
unsigned int usec,
void *data)
{
CoglFlipKMS *flip = data;
process_flip (flip);
}
static void
handle_drm_event (CoglRendererKMS *kms_renderer)
{
drmEventContext evctx;
if (kms_renderer->page_flips_not_supported)
return;
memset (&evctx, 0, sizeof evctx);
evctx.version = DRM_EVENT_CONTEXT_VERSION;
evctx.page_flip_handler = page_flip_handler;
@ -575,6 +585,7 @@ flip_all_crtcs (CoglDisplay *display, CoglFlipKMS *flip, int fb_id)
CoglRendererEGL *egl_renderer = display->renderer->winsys;
CoglRendererKMS *kms_renderer = egl_renderer->platform;
GList *l;
gboolean needs_flip = FALSE;
for (l = kms_display->crtcs; l; l = l->next)
{
@ -584,18 +595,26 @@ flip_all_crtcs (CoglDisplay *display, CoglFlipKMS *flip, int fb_id)
if (crtc->count == 0 || crtc->ignore)
continue;
needs_flip = TRUE;
if (!kms_renderer->page_flips_not_supported)
{
ret = drmModePageFlip (kms_renderer->fd,
crtc->id, fb_id,
DRM_MODE_PAGE_FLIP_EVENT, flip);
if (ret)
{
g_warning ("Failed to flip: %m");
continue;
kms_renderer->page_flips_not_supported = TRUE;
break;
}
}
flip->pending++;
}
if (kms_renderer->page_flips_not_supported && needs_flip)
flip->pending = 1;
}
static void
@ -945,6 +964,13 @@ _cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
{
/* Ensure the onscreen remains valid while it has any pending flips... */
cogl_object_ref (flip->onscreen);
/* Process flip right away if we can't wait for vblank */
if (kms_renderer->page_flips_not_supported)
{
setup_crtc_modes (context->display, kms_onscreen->next_fb_id);
process_flip (flip);
}
}
}