Implemented simple tests for sync track calculations.

src/SkinnedMesh.h

@@ -27,14 +27,32 @@ struct SyncTrack {
   int m_num_intervals;
   float m_interval_durations[cSyncTrackMaxIntervals];
 
-  float ConvertAbsTimeToSyncTime (float abs_time) {
+  float CalcSyncFromAbsTime (float abs_time) {
     float sync_time = fmodf (abs_time, m_duration) / m_duration;
 
     int interval_index = 0;
-    while (sync_time < m_interval_durations[interval_index]) {
+    while (sync_time >= m_interval_durations[interval_index]) {
       sync_time -= m_interval_durations[interval_index];
       interval_index ++;
     }
+
+    return float(interval_index) + sync_time / m_interval_durations[interval_index];
+  }
+
+  float CalcRatioFromSyncTime (float sync_time) {
+    float interval_ratio = fmodf(sync_time, 1.0f);
+    int interval = int(sync_time - interval_ratio);
+
+    float result = 0.f;
+    int i = 0;
+    while (i < interval) {
+      result += m_interval_durations[i];
+      i++;
+    }
+
+    result += m_interval_durations[i] * interval_ratio;
+
+    return result;
   }
 
   static SyncTrack Blend(float weight, const SyncTrack& track_A, const SyncTrack& track_B) {