output: refactor frame submission API

This is necessary for direct scan-out and other upcoming features. This patch
changes the output API to look like the wl_surface API.

Outputs now have some double-buffered state: the frame to be submitted
(currently only wlr_renderer frames are supported) and the damaged region.
To attach a pending frame, use wlr_output_attach_render. To set the pending
damaged region, use wlr_output_set_damage.

To submit the pending state, call wlr_output_commit. This will submit the
pending frame to the backend.

To migrate from the old API to the new one:

- Replace wlr_output_make_current calls by wlr_output_attach_render
- Replace wlr_output_swap_buffers calls by wlr_output_set_damage and
  wlr_output_commit

1 files changed, 2 insertions, 2 deletions

diff --git a/examples/simple.c b/examples/simple.c
index e1c10906..27eb6c20 100644
--- a/examples/simple.c
+++ b/examples/simple.c
@@ -56,12 +56,12 @@ void output_frame_notify(struct wl_listener *listener, void *data) {
 		sample->dec = inc;
 	}
 
-	wlr_output_make_current(sample_output->output, NULL);
+	wlr_output_attach_render(sample_output->output, NULL);
 
 	glClearColor(sample->color[0], sample->color[1], sample->color[2], 1.0);
 	glClear(GL_COLOR_BUFFER_BIT);
 
-	wlr_output_swap_buffers(sample_output->output, NULL, NULL);
+	wlr_output_commit(sample_output->output);
 	sample->last_frame = now;
 }