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[dosdemo] / src / vmath.h

diff --git a/src/vmath.h b/src/vmath.h
index 7e35cc8..6d1add9 100644 (file)
--- a/src/vmath.h
+++ b/src/vmath.h
@@ -29,11 +29,38 @@ static INLINE vec3_t v3_cons(float x, float y, float z)
        return res;
 }
 
+static INLINE void v3_negate(vec3_t *v)
+{
+       v->x = -v->x;
+       v->y = -v->y;
+       v->z = -v->z;
+}
+
 static INLINE float v3_dot(vec3_t v1, vec3_t v2)
 {
        return v1.x * v2.x + v1.y * v2.y + v1.z * v2.z;
 }
 
+static INLINE vec3_t v3_cross(vec3_t v1, vec3_t v2)
+{
+       vec3_t res;
+       res.x = v1.y * v2.z - v1.z * v2.y;
+       res.y = v1.z * v2.x - v1.x * v2.z;
+       res.z = v1.x * v2.y - v1.y * v2.x;
+       return res;
+}
+
+static INLINE void v3_normalize(vec3_t *v)
+{
+       float mag = sqrt(v->x * v->x + v->y * v->y + v->z * v->z);
+       if(mag != 0.0f) {
+               float s = 1.0f / mag;
+               v->x *= s;
+               v->y *= s;
+               v->z *= s;
+       }
+}
+
 /* quaternion functions */
 static INLINE quat_t quat_cons(float s, float x, float y, float z)
 {