2 files changed, 82 insertions, 33 deletions

diff --git a/include/xas/spatial.h b/include/xas/spatial.h
index ed5157a..f8591df 100644
--- a/include/xas/spatial.h
+++ b/include/xas/spatial.h
@@ -47,7 +47,11 @@ struct _xas_spatial_object {
     void *ctx;
     int flags;
 
-    xas_spatial_coord point;
+    xas_spatial_coord point,
+                        heading;
+
+    float speed;
+
     xas_spatial_object *next;
 };
 
@@ -120,6 +124,16 @@ int xas_spatial_object_stop(xas_spatial_object *object);
 void xas_spatial_object_get_point(xas_spatial_object *object,
                                     xas_spatial_coord *point);
 
+float xas_spatial_object_get_speed(xas_spatial_object *object);
+
+void xas_spatial_object_set_speed(xas_spatial_object *object, float speed);
+
+void xas_spatial_object_get_heading(xas_spatial_object *object,
+                                      xas_spatial_coord *heading);
+
+void xas_spatial_object_set_heading(xas_spatial_object *object,
+                                      xas_spatial_coord heading);
+
 xas_audio_stream *xas_spatial_scene_stream_new(xas_spatial_scene *scene,
                                                    size_t buffer_size);
 
diff --git a/src/spatial.c b/src/spatial.c
index 4d52738..7d71e37 100644
--- a/src/spatial.c
+++ b/src/spatial.c
@@ -181,6 +181,34 @@ static void buffer_copy(xas_spatial_buffer *buffer,
     }
 }
 
+static void object_position(xas_spatial_scene *scene,
+                            xas_spatial_object *object,
+                            xas_spatial_coord point) {
+    size_t delta_l_old = object->delta_l,
+           delta_r_old = object->delta_r;
+
+    object->point = point;
+
+    object->distance_l = dist(scene->speaker_l, point);
+    object->distance_r = dist(scene->speaker_r, point);
+    object->delta_l    = sample_delta(scene, object->distance_l);
+    object->delta_r    = sample_delta(scene, object->distance_r);
+    object->shift_l    = object->delta_l - delta_l_old;
+    object->shift_r    = object->delta_r - delta_r_old;
+}
+
+static void object_update_deltas(xas_spatial_scene *scene) {
+    xas_spatial_object *obj = scene->first;
+
+    while (obj) {
+        xas_spatial_object *next = obj->next;
+
+        object_position(scene, obj, obj->point);
+
+        obj = next;
+    }
+}
+
 ssize_t scene_fill(xas_spatial_scene *scene,
                    int16_t *output,
                    size_t count,
@@ -188,6 +216,8 @@ ssize_t scene_fill(xas_spatial_scene *scene,
     xas_spatial_buffer *buffer = scene->buffer;
     xas_spatial_object *obj    = scene->first;
 
+    float interval = 1.0f / (float)scene->format.sample_rate;
+
     size_t index_old = buffer->index;
 
     int16_t *dest = (int16_t *)(scene->buffer + 1);
@@ -221,11 +251,22 @@ ssize_t scene_fill(xas_spatial_scene *scene,
         }
 
         for (i=0; i<readlen; i++) {
-            int16_t value_l = sample_scale(src[i], obj->distance_l),
-                    value_r = sample_scale(src[i], obj->distance_r);
+            size_t value_l, index_l,
+                   value_r, index_r;
+
+            if (obj->speed != 0.0f) {
+                xas_spatial_coord point = obj->point;
+
+                move(&point,
+                     obj->heading,
+                     obj->speed,
+                     interval);
 
-            size_t index_l,
-                   index_r;
+                object_position(scene, obj, point);
+            }
+
+            value_l = sample_scale(src[i], obj->distance_l);
+            value_r = sample_scale(src[i], obj->distance_r);
 
             if (!within_cone(obj->point, cone_l)) {
                 value_l /= 3.0f;
@@ -340,34 +381,6 @@ void xas_spatial_scene_set_observer(xas_spatial_scene *scene,
     scene->observer.width    = width;
 }
 
-static void object_position(xas_spatial_scene *scene,
-                            xas_spatial_object *object,
-                            xas_spatial_coord point) {
-    size_t delta_l_old = object->delta_l,
-           delta_r_old = object->delta_r;
-
-    object->point = point;
-
-    object->distance_l = dist(scene->speaker_l, point);
-    object->distance_r = dist(scene->speaker_r, point);
-    object->delta_l    = sample_delta(scene, object->distance_l);
-    object->delta_r    = sample_delta(scene, object->distance_r);
-    object->shift_l    = object->delta_l - delta_l_old;
-    object->shift_r    = object->delta_r - delta_r_old;
-}
-
-static void object_update_deltas(xas_spatial_scene *scene) {
-    xas_spatial_object *obj = scene->first;
-
-    while (obj) {
-        xas_spatial_object *next = obj->next;
-
-        object_position(scene, obj, obj->point);
-
-        obj = next;
-    }
-}
-
 void xas_spatial_scene_set_speaker_coords(xas_spatial_scene *scene,
                                             xas_spatial_coord speaker_l,
                                             xas_spatial_coord speaker_r) {
@@ -559,6 +572,28 @@ void xas_spatial_object_get_point(xas_spatial_object *object,
     point->z = object->point.z;
 }
 
+float xas_spatial_object_get_speed(xas_spatial_object *object) {
+    return object->speed;
+}
+
+void xas_spatial_object_set_speed(xas_spatial_object *object, float speed) {
+    object->speed = speed;
+}
+
+void xas_spatial_object_get_heading(xas_spatial_object *object,
+                                      xas_spatial_coord *heading) {
+    heading->x = object->heading.x;
+    heading->y = object->heading.y;
+    heading->z = object->heading.z;
+}
+
+void xas_spatial_object_set_heading(xas_spatial_object *object,
+                                      xas_spatial_coord heading) {
+    object->heading.x = heading.x;
+    object->heading.y = heading.y;
+    object->heading.z = heading.z;
+}
+
 int xas_spatial_object_start(xas_spatial_object *object) {
     return ((xas_object *)object->ctx)->start((xas_object *)object->ctx);
 }