Frame interp: Fix stars

include/dusk/frame_interpolation.h

@@ -7,6 +7,7 @@
 #include <stdint.h>
 
 struct cXyz;
+class camera_process_class;
 
 #ifdef __cplusplus
 namespace dusk {
@@ -14,6 +15,7 @@ namespace frame_interp {
 
 void ensure_initialized();
 
+void begin_record_camera();
 void begin_record();
 void end_record();
 void interpolate(float step);
@@ -25,12 +27,14 @@ void end_presentation_ui_pass();
 
 void open_child(const void* key, int32_t id);
 void close_child();
+void record_camera(::camera_process_class* cam, int camera_id);
 void record_final_mtx_raw(const Mtx* dest, const Mtx src);
 
 bool lookup_replacement(const void* source, Mtx out);
 bool lookup_concat_replacement(const void* lhs, const void* rhs, Mtx out);
 
 void camera_eye_from_view_mtx(MtxP view_mtx, cXyz* o_eye);
+bool build_star_view(Mtx o_view, Mtx o_cam_billboard_base, cXyz* o_anchor_eye, float* o_fovy);
 
 }  // namespace frame_interp
 }  // namespace dusk