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/multi-pointer.c b/examples/multi-pointer.c
index a007f712..44cf26d5 100644
--- a/examples/multi-pointer.c
+++ b/examples/multi-pointer.c
@@ -94,14 +94,14 @@ void output_frame_notify(struct wl_listener *listener, void *data) {
 	struct sample_state *sample = output->sample;
 	struct wlr_output *wlr_output = output->output;
 
-	wlr_output_make_current(wlr_output, NULL);
+	wlr_output_attach_render(wlr_output, NULL);
 
 	glClearColor(sample->clear_color[0], sample->clear_color[1],
 		sample->clear_color[2], sample->clear_color[3]);
 	glClear(GL_COLOR_BUFFER_BIT);
 
 	wlr_output_render_software_cursors(wlr_output, NULL);
-	wlr_output_swap_buffers(wlr_output, NULL, NULL);
+	wlr_output_commit(wlr_output);
 }
 
 static void handle_cursor_motion(struct wl_listener *listener, void *data) {