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/fullscreen-shell.c b/examples/fullscreen-shell.c
index 7f2c9c2b..e9e64ce1 100644
--- a/examples/fullscreen-shell.c
+++ b/examples/fullscreen-shell.c
@@ -89,7 +89,7 @@ static void output_handle_frame(struct wl_listener *listener, void *data) {
 	int width, height;
 	wlr_output_effective_resolution(output->wlr_output, &width, &height);
 
-	if (!wlr_output_make_current(output->wlr_output, NULL)) {
+	if (!wlr_output_attach_render(output->wlr_output, NULL)) {
 		return;
 	}
 
@@ -108,7 +108,7 @@ static void output_handle_frame(struct wl_listener *listener, void *data) {
 	}
 
 	wlr_renderer_end(renderer);
-	wlr_output_swap_buffers(output->wlr_output, NULL, NULL);
+	wlr_output_commit(output->wlr_output);
 }
 
 static void output_set_surface(struct fullscreen_output *output,