From c81f8fb94233c45ac6fd9bf025d9e704133d35ca Mon Sep 17 00:00:00 2001
From: Tenari <djz24@case.edu>
Date: Fri, 19 Jun 2026 07:16:21 -0500
Subject: [PATCH] lol everyone re-invents a vector lib

---
 all.h  |  3 +++
 math.c | 27 +++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/all.h b/all.h
index 31d9add..59718c1 100644
--- a/all.h
+++ b/all.h
@@ -622,6 +622,9 @@ fn Range1u64 range1u64Create(u64 min, u64 max);
 fn Range1u64 mRangeFromNIdxMCount(u64 n_idx, u64 n_count, u64 m_count);
 fn void u32Quicksort(u32 arr[], u32 low, u32 high);
 fn void u32ReverseArray(u32 arr[], u32 size);
+fn Vec2f32 vec2Add(Vec2 a, Vec2 b);
+fn Vec2f32 vec2Subtract(Vec2 a, Vec2 b);
+fn Vec2f32 vec2FromHexCube(Vec2 map_center, XYZ cube, f32 size, f32 border_thickness);
 
 ///// MEMORY (Arenas)
 #define ARENA_MAX GB(1)
diff --git a/math.c b/math.c
index dd52e7d..0aeceea 100644
--- a/math.c
+++ b/math.c
@@ -72,3 +72,30 @@ fn void u32ReverseArray(u32 arr[], u32 size) {
   }
 }
 
+fn Vec2f32 vec2Add(Vec2 a, Vec2 b) {
+  Vec2f32 result = a;
+  result.x += b.x;
+  result.y += b.y;
+  return result;
+}
+
+fn Vec2f32 vec2Subtract(Vec2 a, Vec2 b) {
+  Vec2f32 result = a;
+  result.x -= b.x;
+  result.y -= b.y;
+  return result;
+}
+
+fn Vec2f32 vec2FromHexCube(Vec2 map_center, XYZ cube, f32 size, f32 border_thickness) {
+  f32 hex_height = SQRT_3 * size;
+  f32 hex_width = 2.0 * size; 
+  f32 horiz_spacing = 0.75 * (hex_width - border_thickness);
+  f32 vert_spacing = (hex_height - border_thickness);
+  bool parity = cube.x & 1;
+  i32 use_y = cube.y * -1;
+  return (Vec2) {
+    .x = map_center.x + (cube.x * horiz_spacing),
+    .y = map_center.y + ((use_y + (f32)(cube.x + parity) / 2.0) * vert_spacing) - (parity ? 0.5*vert_spacing : 0),
+  };
+}
+