project for a (works on my devices) demo

headers/input/touch/touch_controller_L3_deltas_compute.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef struct {
+	uint8_t state; /* entered unchanged exited */
+	uint8_t old_index;
+	uint8_t new_index;
+	uint64_t tracking_id;
+} tracked_delta;
+
+/* could also resort to TRANSIENT / PERSISTENT */
+static const uint8_t TRACKED_DELTA_ENTERED = 0;
+static const uint8_t TRACKED_DELTA_UNCHANGED = 1;
+static const uint8_t TRACKED_DELTA_EXITED = 2;
+
+
+void touch_events_sorted_ids_deltas( 
+	tracked_delta **endbuffer, uint16_t *endcount, 
+	uint64_t *previous_ids, uint8_t previous_count, 
+	uint64_t *current_ids, uint8_t current_count
+);