polyadvent

commit a386037a32d1d36ee9582c75dd1935f0cb973d4f
parent cd968f4dd9f69a1f415884914863c541e6995981
Author: William Casarin <jb55@jb55.com>
Date:   Mon, 29 Jul 2019 08:03:19 -0700

split vec3_forward out to vec3_forward_amt

sometimes you don't need the vec3_add at the end

Diffstat:
M
src/mat_util.c
 | 
12
++++++++----
M
src/mat_util.h
 | 
1
+

2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/src/mat_util.c b/src/mat_util.c
@@ -25,12 +25,16 @@ mat4 *mat4_create_transform(float *pos, float *scale, float *rot, mat4 *dest) {
   return dest;
 }
 
+vec3 *vec3_forward_amt(quat *orientation, float *dir, float *dest)
+{
+    float q[4] = {0};
+    quat_inverse(orientation, q);
+    quat_multiply_vec3(q, dir, dest);
+    return dest;
+}
 
 vec3 *vec3_forward(vec3 *v, quat *orientation, float *dir, float *dest) {
-    float q[4] = {0};
     float movement[3] = {0};
-    quat_inverse(orientation, q);
-    quat_multiply_vec3(q, dir, movement);
-    vec3_add(v, movement, dest);
+    vec3_add(v, vec3_forward_amt(orientation, dir, movement), dest);
     return dest;
 }
diff --git a/src/mat_util.h b/src/mat_util.h
@@ -9,5 +9,6 @@
 void look_at(vec3 *eye, vec3 *target, vec3 *up, mat4 *dest);
 mat4 *mat4_create_transform(float *pos, float *scale, quat *orientation, mat4 *dest);
 vec3 *vec3_forward(vec3 *p, quat *orientation, vec3 *dir, float *dest);
+vec3 *vec3_forward_amt(quat *orientation, float *dir, float *dest);
 
 #endif /* POLYADVENT_MAT_UTIL_H */