collision

1 files changed, 9 insertions, 2 deletions

diff --git a/src/ray.h b/src/ray.h
index 8ad2638..6f2e600 100644
--- a/src/ray.h
+++ b/src/ray.h
@@ -3,6 +3,14 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#define PI		3.14159265358979323846
+#define PIH		1.57079632679489661923
+#define PI2		6.28318530718
+
+#define sign(a) ((a) < 0 ? -1 : 1)
+#define min(a, b) ((a) < (b) ? (a) : (b))
+#define max(a, b) ((a) > (b) ? (a) : (b))
+
 typedef struct {
     float x, y;
 } v2;
@@ -11,10 +19,9 @@ typedef struct {
     int x, y;
 } v2i;
 
-
 float v2_cross(v2 a, v2 b);
 float v2_len(v2 a);
+float v2_dist(v2 a, v2 b);
 float v2_square_dist(v2 a, v2 b);
-v2 v2_add(v2 a, v2 b);
 
 uint32_t cast_ray(v2 pos, float theta, v2* hit_pos);