fix some issues

Makefile

@@ -1,7 +1,5 @@
 REAL_CFLAGS = -I./include $(shell pkg-config --cflags gbm libdrm glesv2 egl libsystemd libinput libudev) \
 	-DBUILD_TEXT_INPUT_PLUGIN \
-	-DBUILD_GPIOD_PLUGIN \
-	-DBUILD_SPIDEV_PLUGIN \
 	-DBUILD_TEST_PLUGIN \
 	-DBUILD_OMXPLAYER_VIDEO_PLAYER_PLUGIN \
 	-O0 -ggdb \

include/flutter-pi.h

@@ -464,6 +464,25 @@ int flutterpi_fill_view_properties(
 	int rotation
 );
 
+int flutterpi_post_platform_task(
+	int (*callback)(void *userdata),
+	void *userdata
+);
+
+int flutterpi_post_platform_task_with_time(
+	int (*callback)(void *userdata),
+	void *userdata,
+	uint64_t target_time_usec
+);
+
+int flutterpi_sd_event_add_io(
+	sd_event_source **source_out,
+	int fd,
+	uint32_t events,
+	sd_event_io_handler_t callback,
+	void *userdata
+);
+
 int flutterpi_send_platform_message(
 	const char *channel,
 	const uint8_t *restrict message,

include/modesetting.h

@@ -86,6 +86,38 @@ int drmdev_configure(
     const drmModeModeInfo *mode
 );
 
+int drmdev_plane_supports_setting_rotation_value(
+    struct drmdev *drmdev,
+    uint32_t plane_id,
+    int drm_rotation,
+    bool *result
+);
+
+int drmdev_plane_get_min_zpos_value(
+    struct drmdev *drmdev,
+    uint32_t plane_id,
+    int64_t *min_zpos_out
+);
+
+int drmdev_plane_get_max_zpos_value(
+    struct drmdev *drmdev,
+    uint32_t plane_id,
+    int64_t *max_zpos_out
+);
+
+int drmdev_plane_supports_setting_zpos(
+    struct drmdev *drmdev,
+    uint32_t plane_id,
+    bool *result
+);
+
+int drmdev_plane_supports_setting_zpos_value(
+    struct drmdev *drmdev,
+    uint32_t plane_id,
+    int64_t zpos,
+    bool *result
+);
+
 int drmdev_new_atomic_req(
     struct drmdev *drmdev,
     struct drmdev_atomic_req **req_out

src/compositor.c

@@ -351,6 +351,7 @@ static int rendertarget_gbm_present(
 	struct rendertarget_gbm *gbm_target;
 	struct gbm_bo *next_front_bo;
 	uint32_t next_front_fb_id;
+	bool supported;
 	int ok;
 
 	gbm_target = &target->gbm;
@@ -368,8 +369,41 @@ static int rendertarget_gbm_present(
 	drmdev_atomic_req_put_plane_property(atomic_req, drm_plane_id, "CRTC_Y", 0);
 	drmdev_atomic_req_put_plane_property(atomic_req, drm_plane_id, "CRTC_W", flutterpi.display.width);
 	drmdev_atomic_req_put_plane_property(atomic_req, drm_plane_id, "CRTC_H", flutterpi.display.height);
-	drmdev_atomic_req_put_plane_property(atomic_req, drm_plane_id, "rotation", DRM_MODE_ROTATE_0);
-	drmdev_atomic_req_put_plane_property(atomic_req, drm_plane_id, "zpos", zpos);
+
+	ok = drmdev_plane_supports_setting_rotation_value(atomic_req->drmdev, drm_plane_id, DRM_MODE_ROTATE_0, &supported);
+	if (ok != 0) return ok;
+
+	if (supported) {
+		drmdev_atomic_req_put_plane_property(atomic_req, drm_plane_id, "rotation", DRM_MODE_ROTATE_0);
+	} else {
+		static bool printed = false;
+
+		if (!printed) {
+			fprintf(stderr,
+					"[compositor] GPU does not support reflecting the screen in Y-direction.\n"
+					"             This is required for rendering into hardware overlay planes though.\n"
+					"             Any UI that is drawn in overlay planes will look upside down.\n"
+			);
+			printed = true;
+		}
+	}
+
+	ok = drmdev_plane_supports_setting_zpos_value(atomic_req->drmdev, drm_plane_id, zpos, &supported);
+	if (ok != 0) return ok;
+
+	if (supported) {
+		drmdev_atomic_req_put_plane_property(atomic_req, drm_plane_id, "zpos", zpos);
+	} else {
+		static bool printed = false;
+
+		if (!printed) { 
+			fprintf(stderr,
+					"[compositor] GPU does not supported the desired HW plane order.\n"
+					"             Some UI layers may be invisible.\n"
+			);
+			printed = true;
+		}
+	}
 
 	// TODO: move this to the page flip handler.
 	// We can only be sure the buffer can be released when the buffer swap
@@ -438,6 +472,7 @@ static int rendertarget_nogbm_present(
 	int zpos
 ) {
 	struct rendertarget_nogbm *nogbm_target;
+	bool supported;
 	int ok;
 
 	nogbm_target = &target->nogbm;
@@ -456,8 +491,41 @@ static int rendertarget_nogbm_present(
 	drmdev_atomic_req_put_plane_property(req, drm_plane_id, "CRTC_Y", 0);
 	drmdev_atomic_req_put_plane_property(req, drm_plane_id, "CRTC_W", flutterpi.display.width);
 	drmdev_atomic_req_put_plane_property(req, drm_plane_id, "CRTC_H", flutterpi.display.height);
-	drmdev_atomic_req_put_plane_property(req, drm_plane_id, "rotation", DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_Y);
-	drmdev_atomic_req_put_plane_property(req, drm_plane_id, "zpos", zpos);
+
+	ok = drmdev_plane_supports_setting_rotation_value(req->drmdev, drm_plane_id, DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_Y, &supported);
+	if (ok != 0) return ok;
+
+	if (supported) {
+		drmdev_atomic_req_put_plane_property(req, drm_plane_id, "rotation", DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_Y);
+	} else {
+		static bool printed = false;
+
+		if (!printed) {
+			fprintf(stderr,
+					"[compositor] GPU does not support reflecting the screen in Y-direction.\n"
+					"             This is required for rendering into hardware overlay planes though.\n"
+					"             Any UI that is drawn in overlay planes will look upside down.\n"
+			);
+			printed = true;
+		}
+	}
+
+	ok = drmdev_plane_supports_setting_zpos_value(req->drmdev, drm_plane_id, zpos, &supported);
+	if (ok != 0) return ok;
+
+	if (supported) {
+		drmdev_atomic_req_put_plane_property(req, drm_plane_id, "zpos", zpos);
+	} else {
+		static bool printed = false;
+
+		if (!printed) { 
+			fprintf(stderr,
+					"[compositor] GPU does not supported the desired HW plane order.\n"
+					"             Some UI layers may be invisible.\n"
+			);
+			printed = true;
+		}
+	}
 
 	return 0;
 }
@@ -709,10 +777,32 @@ static bool on_present_layers(
 		ok = drmdev_atomic_req_put_modeset_props(req, &req_flags);
 		if (ok != 0) return false;
 
+		int64_t max_zpos = 0;
+
 		for_each_unreserved_plane_in_atomic_req(req, plane) {
 			if (plane->type == DRM_PLANE_TYPE_CURSOR) {
 				// make sure the cursor is in front of everything
-				drmdev_atomic_req_put_plane_property(req, plane->plane->plane_id, "zpos", 2);
+				int64_t max_zpos;
+				bool supported;
+
+				ok = drmdev_plane_get_max_zpos_value(req->drmdev, plane->plane->plane_id, &max_zpos);
+				if (ok != 0) {
+					printf("[compositor] Could not move cursor to front. Mouse cursor may be invisible. drmdev_plane_get_max_zpos_value: %s\n", strerror(ok));
+					continue;
+				}
+
+				ok = drmdev_plane_supports_setting_zpos_value(req->drmdev, plane->plane->plane_id, max_zpos, &supported);
+				if (ok != 0) {
+					printf("[compositor] Could not move cursor to front. Mouse cursor may be invisible. drmdev_plane_supports_setting_zpos_value: %s\n", strerror(ok));
+					continue;
+				}
+
+				if (supported) {
+					drmdev_atomic_req_put_plane_property(req, plane->plane->plane_id, "zpos", max_zpos);
+				} else {
+					printf("[compositor] Could not move cursor to front. Mouse cursor may be invisible. drmdev_plane_supports_setting_zpos_value: %s\n", strerror(ok));
+					continue;
+				}
 			}
 		}
 
@@ -865,6 +955,17 @@ static bool on_present_layers(
 			}
 		}
 	}
+
+	int64_t min_zpos;
+	for_each_unreserved_plane_in_atomic_req(req, plane) {
+		if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
+			ok = drmdev_plane_get_min_zpos_value(req->drmdev, plane->plane->plane_id, &min_zpos);
+			if (ok != 0) {
+				min_zpos = 0;
+			}
+			break;
+		}
+	}
 
 	for (int i = 0; i < layers_count; i++) {
 		if (layers[i]->type == kFlutterLayerContentTypeBackingStore) {
@@ -899,7 +1000,7 @@ static bool on_present_layers(
 				0,
 				compositor->drmdev->selected_mode->hdisplay,
 				compositor->drmdev->selected_mode->vdisplay,
-				plane->type == DRM_PLANE_TYPE_PRIMARY ? 0 : 1
+				i + min_zpos
 			);
 			if (ok != 0) {
 				fprintf(stderr, "[compositor] Could not present backing store. rendertarget->present: %s\n", strerror(ok));
@@ -917,7 +1018,7 @@ static bool on_present_layers(
 					(int) round(layers[i]->offset.y),
 					(int) round(layers[i]->size.width),
 					(int) round(layers[i]->size.height),
-					i,
+					i + min_zpos,
 					cb_data->userdata
 				);
 				if (ok != 0) {
@@ -1003,8 +1104,6 @@ int compositor_remove_view_callbacks(int64_t view_id) {
 	return 0;
 }
 
-/// DRM HARDWARE PLANE RESERVATION
-
 /// COMPOSITOR INITIALIZATION
 int compositor_initialize(struct drmdev *drmdev) {
 	compositor.drmdev = drmdev;

src/flutter-pi.c

@@ -132,10 +132,10 @@ SEE ALSO:\n\
 
 struct flutterpi flutterpi;
 
-static int post_platform_task(
+/*static int flutterpi_post_platform_task(
 	int (*callback)(void *userdata),
 	void *userdata
-);
+);*/
 
 static bool runs_platform_tasks_on_current_thread(void *userdata);
 
@@ -442,7 +442,7 @@ static void on_frame_request(
 		}
 
 		if (reply_instantly) {	
-			post_platform_task(
+			flutterpi_post_platform_task(
 				on_execute_frame_request,
 				NULL
 			);
@@ -480,7 +480,7 @@ static int on_execute_platform_task(
 	return 0;
 }
 
-static int post_platform_task(
+int flutterpi_post_platform_task(
 	int (*callback)(void *userdata),
 	void *userdata
 ) {
@@ -558,7 +558,7 @@ static int on_execute_platform_task_with_time(
 	return 0;
 }
 
-static int post_platform_task_with_time(
+int flutterpi_post_platform_task_with_time(
 	int (*callback)(void *userdata),
 	void *userdata,
 	uint64_t target_time_usec
@@ -621,6 +621,54 @@ static int post_platform_task_with_time(
 	return ok;
 }
 
+int flutterpi_sd_event_add_io(
+	sd_event_source **source_out,
+	int fd,
+	uint32_t events,
+	sd_event_io_handler_t callback,
+	void *userdata
+) {
+	int ok;
+
+	if (pthread_self() != flutterpi.event_loop_thread) {
+		pthread_mutex_lock(&flutterpi.event_loop_mutex);
+	}
+
+	ok = sd_event_add_io(
+		flutterpi.event_loop,
+		source_out,
+		fd,
+		events,
+		callback,
+		userdata
+	);
+	if (ok < 0) {
+		fprintf(stderr, "[flutter-pi] Could not add IO callback to event loop. sd_event_add_io: %s\n", strerror(-ok));
+		return -ok;
+	}
+
+	if (pthread_self() != flutterpi.event_loop_thread) {
+		ok = write(flutterpi.wakeup_event_loop_fd, (uint8_t[8]) {0, 0, 0, 0, 0, 0, 0, 1}, 8);
+		if (ok < 0) {
+			perror("[flutter-pi] Error arming main loop for io callback. write");
+			ok = errno;
+			goto fail_unlock_event_loop;
+		}
+	}
+
+	if (pthread_self() != flutterpi.event_loop_thread) {
+		pthread_mutex_unlock(&flutterpi.event_loop_mutex);
+	}
+
+	return 0;
+
+
+	fail_unlock_event_loop:
+	if (pthread_self() != flutterpi.event_loop_thread) {
+		pthread_mutex_unlock(&flutterpi.event_loop_mutex);
+	}
+}
+
 /// flutter tasks
 static int on_execute_flutter_task(
 	void *userdata
@@ -658,7 +706,7 @@ static void on_post_flutter_task(
 
 	*dup_task = task;
 
-	ok = post_platform_task_with_time(
+	ok = flutterpi_post_platform_task_with_time(
 		on_execute_flutter_task,
 		dup_task,
 		target_time / 1000
@@ -762,7 +810,7 @@ int flutterpi_send_platform_message(
 			msg->message_size = 0;
 		}
 
-		ok = post_platform_task(
+		ok = flutterpi_post_platform_task(
 			on_send_platform_message,
 			msg
 		);
@@ -819,7 +867,7 @@ int flutterpi_respond_to_platform_message(
 			msg->message = 0;
 		}
 
-		ok = post_platform_task(
+		ok = flutterpi_post_platform_task(
 			on_send_platform_message,
 			msg
 		);
@@ -987,6 +1035,7 @@ static void on_pageflip_event(
 
 	flutterpi.flutter.libflutter_engine.FlutterEngineTraceEventInstant("pageflip");
 
+
 	cqueue_lock(&flutterpi.frame_queue);
 
 	ok = cqueue_try_dequeue_locked(&flutterpi.frame_queue, &presented_frame);