Have backend manage opengl context

backend/drm/drm.c

@@ -94,23 +94,21 @@ static uint32_t get_fb_for_bo(int fd, struct gbm_bo *bo) {
 	return *id;
 }
 
-void wlr_drm_output_begin(struct wlr_output *output) {
-	struct wlr_output_state *_output = output->state;
-	struct wlr_drm_renderer *renderer = _output->renderer;
-	eglMakeCurrent(renderer->egl.display, _output->egl,
-			_output->egl, renderer->egl.context);
+static void wlr_drm_output_begin(struct wlr_output_state *output) {
+	struct wlr_drm_renderer *renderer = output->renderer;
+	eglMakeCurrent(renderer->egl.display, output->egl,
+			output->egl, renderer->egl.context);
 }
 
-void wlr_drm_output_end(struct wlr_output *output) {
-	struct wlr_output_state *_output = output->state;
-	struct wlr_drm_renderer *renderer = _output->renderer;
+static void wlr_drm_output_end(struct wlr_output_state *output) {
+	struct wlr_drm_renderer *renderer = output->renderer;
 
-	eglSwapBuffers(renderer->egl.display, _output->egl);
-	struct gbm_bo *bo = gbm_surface_lock_front_buffer(_output->gbm);
+	eglSwapBuffers(renderer->egl.display, output->egl);
+	struct gbm_bo *bo = gbm_surface_lock_front_buffer(output->gbm);
 	uint32_t fb_id = get_fb_for_bo(renderer->fd, bo);
-	drmModePageFlip(renderer->fd, _output->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, _output);
-	gbm_surface_release_buffer(_output->gbm, bo);
-	_output->pageflip_pending = true;
+	drmModePageFlip(renderer->fd, output->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, output);
+	gbm_surface_release_buffer(output->gbm, bo);
+	output->pageflip_pending = true;
 }
 
 static bool display_init_renderer(struct wlr_drm_renderer *renderer,
@@ -396,7 +394,9 @@ static void page_flip_handler(int fd, unsigned seq,
 
 	output->pageflip_pending = false;
 	if (output->state == DRM_OUTPUT_CONNECTED) {
+		wlr_drm_output_begin(output);
 		wl_signal_emit(&output->wlr_output->events.frame, output->wlr_output);
+		wlr_drm_output_end(output);
 	}
 }
 
@@ -465,10 +465,10 @@ void wlr_drm_output_dpms(int fd, struct wlr_output_state *output, bool screen_on
 			DRM_MODE_DPMS_ON);
 
 		// Start rendering loop again by drawing a black frame
-		wlr_drm_output_begin(output->wlr_output);
+		wlr_drm_output_begin(output);
 		glClearColor(0.0, 0.0, 0.0, 1.0);
 		glClear(GL_COLOR_BUFFER_BIT);
-		wlr_drm_output_end(output->wlr_output);
+		wlr_drm_output_end(output);
 	} else {
 		drmModeConnectorSetProperty(fd, output->connector, output->props.dpms,
 			DRM_MODE_DPMS_STANDBY);

example/main.c

@@ -24,9 +24,7 @@ struct output_state {
 };
 
 void output_frame(struct wl_listener *listener, void *data) {
-	struct wlr_output *output = data;
-	struct output_state *ostate = wl_container_of(
-			listener, ostate, frame);
+	struct output_state *ostate = wl_container_of(listener, ostate, frame);
 	struct state *s = ostate->state;
 
 	struct timespec now;
@@ -48,12 +46,8 @@ void output_frame(struct wl_listener *listener, void *data) {
 
 	s->last_frame = now;
 
-	wlr_drm_output_begin(output);
-
 	glClearColor(s->color[0], s->color[1], s->color[2], 1.0);
 	glClear(GL_COLOR_BUFFER_BIT);
-
-	wlr_drm_output_end(output);
 }
 
 void output_add(struct wl_listener *listener, void *data) {

include/wlr/backend/drm.h

@@ -12,7 +12,4 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 
 void wlr_drm_backend_dpms(struct wlr_backend *backend, bool screen_on);
 
-void wlr_drm_output_begin(struct wlr_output *out);
-void wlr_drm_output_end(struct wlr_output *out);
-
 #endif