From 058b8bdf2755da16d38dccc8de715a984fdd620c Mon Sep 17 00:00:00 2001
From: Scott Anderson <ascent12@hotmail.com>
Date: Sun, 14 May 2017 01:12:47 +1200
Subject: Working commit

---
 backend/drm/backend.c | 32 ++++++++++++++++++++++++++++++++
 backend/drm/drm.c     | 28 ++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)

(limited to 'backend')

diff --git a/backend/drm/backend.c b/backend/drm/backend.c
index f202d4d6..48e207c8 100644
--- a/backend/drm/backend.c
+++ b/backend/drm/backend.c
@@ -37,6 +37,29 @@ static struct wlr_backend_impl backend_impl = {
 	.destroy = wlr_drm_backend_destroy
 };
 
+static void device_paused(struct wl_listener *listener, void *data) {
+	struct wlr_backend_state *backend = wl_container_of(listener, backend, device_paused);
+
+	// TODO: Actually pause the renderer or something.
+	// We currently just expect it to fail its next pageflip.
+
+	(void)backend;
+}
+
+static void device_resumed(struct wl_listener *listener, void *data) {
+	struct wlr_backend_state *drm = wl_container_of(listener, drm, device_paused);
+	int *new_fd = data;
+
+	close(drm->fd);
+	drm->fd = *new_fd;
+	drm->renderer.fd = *new_fd;
+
+	for (size_t i = 0; i < drm->outputs->length; ++i) {
+		struct wlr_output_state *output = drm->outputs->items[i];
+		wlr_drm_output_draw_blank(output);
+	}
+}
+
 struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 		struct wlr_session *session) {
 	struct wlr_backend_state *state = calloc(1, sizeof(struct wlr_backend_state));
@@ -79,6 +102,15 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 		goto error_fd;
 	}
 
+	wl_list_init(&state->device_paused.link);
+	wl_list_init(&state->device_paused.link);
+
+	state->device_paused.notify = device_paused;
+	state->device_resumed.notify = device_resumed;
+
+	wl_signal_add(&session->device_paused, &state->device_paused);
+	wl_signal_add(&session->device_resumed, &state->device_resumed);
+
 	// TODO: what is the difference between the per-output renderer and this
 	// one?
 	if (!wlr_drm_renderer_init(&state->renderer, state->fd)) {
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index db75853d..bd8c6506 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -474,3 +474,31 @@ void wlr_drm_output_dpms(int fd, struct wlr_output_state *output, bool screen_on
 			DRM_MODE_DPMS_STANDBY);
 	}
 }
+
+void wlr_drm_output_draw_blank(struct wlr_output_state *output) {
+	if (output->state != DRM_OUTPUT_CONNECTED) {
+		return;
+	}
+
+	struct wlr_drm_renderer *renderer = output->renderer;
+
+	eglMakeCurrent(renderer->egl.display, output->egl, output->egl, renderer->egl.context);
+
+	glViewport(0, 0, output->width, output->height);
+	glClearColor(0.0, 0.0, 0.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	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);
+
+	drmModeSetCrtc(renderer->fd, output->crtc, fb_id, 0, 0,
+			&output->connector, 1, &output->wlr_output->current_mode->state->mode);
+	drmModePageFlip(renderer->fd, output->crtc, fb_id,
+			DRM_MODE_PAGE_FLIP_EVENT, output);
+
+	gbm_surface_release_buffer(output->gbm, bo);
+
+	wlr_log(L_INFO, "Drew blank frame");
+}
-- 
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