altos: Mark arguments to quaternion functions as const

[fw/altos] / src / core / ao_quaternion.h

diff --git a/src/core/ao_quaternion.h b/src/core/ao_quaternion.h
index f4b8aaa49a40f99ea572521722c523e7055096f7..1c0617c43bcfd56aae683054e776eac181819731 100644 (file)
--- a/src/core/ao_quaternion.h
+++ b/src/core/ao_quaternion.h
@@ -26,8 +26,8 @@ struct ao_quaternion {
 };
 
 static inline void ao_quaternion_multiply(struct ao_quaternion *r,
-                                         struct ao_quaternion *a,
-                                         struct ao_quaternion *b)
+                                         const struct ao_quaternion *a,
+                                         const struct ao_quaternion *b)
 {
        struct ao_quaternion    t;
 #define T(_a,_b)       (((a)->_a) * ((b)->_b))
@@ -40,7 +40,7 @@ static inline void ao_quaternion_multiply(struct ao_quaternion *r,
 }
 
 static inline void ao_quaternion_conjugate(struct ao_quaternion *r,
-                                          struct ao_quaternion *a)
+                                          const struct ao_quaternion *a)
 {
        r->r = a->r;
        r->x = -a->x;
@@ -48,7 +48,7 @@ static inline void ao_quaternion_conjugate(struct ao_quaternion *r,
        r->z = -a->z;
 }
 
-static inline float ao_quaternion_normal(struct ao_quaternion *a)
+static inline float ao_quaternion_normal(const struct ao_quaternion *a)
 {
 #define S(_a)  (((a)->_a) * ((a)->_a))
        return S(r) + S(x) + S(y) + S(z);
@@ -56,7 +56,7 @@ static inline float ao_quaternion_normal(struct ao_quaternion *a)
 }
 
 static inline void ao_quaternion_scale(struct ao_quaternion *r,
-                                      struct ao_quaternion *a,
+                                      const struct ao_quaternion *a,
                                       float b)
 {
        r->r = a->r * b;
@@ -66,7 +66,7 @@ static inline void ao_quaternion_scale(struct ao_quaternion *r,
 }
 
 static inline void ao_quaternion_normalize(struct ao_quaternion *r,
-                                          struct ao_quaternion *a)
+                                          const struct ao_quaternion *a)
 {
        float   n = ao_quaternion_normal(a);