output: re-introduce atomic mode, enabled, scale and transform

This reverts commit 01f903874b7e27539488fad7f31476d5bcbc6ac9 and re-applies
commit ee5f98ad49fed0439f3313ec685307831d1d1d05.

Updates: https://github.com/swaywm/wlroots/issues/1640 (Atomic output updates issue)
See also: https://github.com/swaywm/wlroots/pull/1762 (Atomic output updates original PR)
See also: https://github.com/swaywm/wlroots/issues/1780 (Issue caused by atomic output updates)
See also: https://github.com/swaywm/sway/issues/4419 (Issue caused by atomic output updates)
See also: https://github.com/swaywm/wlroots/pull/1781 (Revert PR)

1 files changed, 44 insertions, 7 deletions

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index a4f22590..60c9e44c 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -334,12 +334,9 @@ static bool drm_connector_attach_render(struct wlr_output *output,
 	return make_drm_surface_current(&conn->crtc->primary->surf, buffer_age);
 }
 
-static bool drm_connector_commit(struct wlr_output *output) {
+static bool drm_connector_commit_buffer(struct wlr_output *output) {
 	struct wlr_drm_connector *conn = get_drm_connector_from_output(output);
 	struct wlr_drm_backend *drm = get_drm_backend_from_backend(output->backend);
-	if (!drm->session->active) {
-		return false;
-	}
 
 	struct wlr_drm_crtc *crtc = conn->crtc;
 	if (!crtc) {
@@ -415,6 +412,49 @@ static bool drm_connector_commit(struct wlr_output *output) {
 	return true;
 }
 
+static bool drm_connector_set_custom_mode(struct wlr_output *output,
+	int32_t width, int32_t height, int32_t refresh);
+
+static bool drm_connector_commit(struct wlr_output *output) {
+	struct wlr_drm_backend *drm = get_drm_backend_from_backend(output->backend);
+
+	if (!drm->session->active) {
+		return false;
+	}
+
+	if (output->pending.committed & WLR_OUTPUT_STATE_ENABLED) {
+		if (!enable_drm_connector(output, output->pending.enabled)) {
+			return false;
+		}
+	}
+
+	if (output->pending.committed & WLR_OUTPUT_STATE_MODE) {
+		switch (output->pending.mode_type) {
+		case WLR_OUTPUT_STATE_MODE_FIXED:
+			if (!drm_connector_set_mode(output, output->pending.mode)) {
+				return false;
+			}
+			break;
+		case WLR_OUTPUT_STATE_MODE_CUSTOM:
+			if (!drm_connector_set_custom_mode(output,
+					output->pending.custom_mode.width,
+					output->pending.custom_mode.height,
+					output->pending.custom_mode.refresh)) {
+				return false;
+			}
+			break;
+		}
+	}
+
+	if (output->pending.committed & WLR_OUTPUT_STATE_BUFFER) {
+		if (!drm_connector_commit_buffer(output)) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
 static void fill_empty_gamma_table(size_t size,
 		uint16_t *r, uint16_t *g, uint16_t *b) {
 	for (uint32_t i = 0; i < size; ++i) {
@@ -1002,9 +1042,6 @@ static void drm_connector_destroy(struct wlr_output *output) {
 }
 
 static const struct wlr_output_impl output_impl = {
-	.enable = enable_drm_connector,
-	.set_mode = drm_connector_set_mode,
-	.set_custom_mode = drm_connector_set_custom_mode,
 	.set_cursor = drm_connector_set_cursor,
 	.move_cursor = drm_connector_move_cursor,
 	.destroy = drm_connector_destroy,