From 5e70354ec23e11ecf7325fe4833778978968c6cb Mon Sep 17 00:00:00 2001
From: Leo Sulzbacher <dev@lowearthorbit.de>
Date: Sat, 14 Mar 2026 17:25:54 +0100
Subject: [PATCH] feat: add common vec2 and vec3 operations

---
 .gitea/workflows/ci.yml |  2 +-
 include/curtle/vector.h | 19 ++++++++---
 src/vector.c            | 71 +++++++++++++++++++++++++++++++++++++++--
 tests/test_vector.c     | 10 +++---
 4 files changed, 90 insertions(+), 12 deletions(-)

diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index cd23a60..45025d2 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -1,6 +1,6 @@
 name: CI
 
-on: [push, pull_request]
+on: [ push, pull_request ]
 
 jobs:
   build:
diff --git a/include/curtle/vector.h b/include/curtle/vector.h
index 02f6109..f320c4d 100644
--- a/include/curtle/vector.h
+++ b/include/curtle/vector.h
@@ -1,12 +1,23 @@
 #ifndef CURTLE_VECTOR_H
 #define CURTLE_VECTOR_H
 
-struct vec2
-{
-    double x;
-    double y;
+struct vec2 {
+	float x;
+	float y;
+};
+
+struct vec3 {
+	float x;
+	float y;
+	float z;
 };
 
 struct vec2 vec2_add(struct vec2 a, struct vec2 b);
 
+struct vec2 vec2_sub(struct vec2 a, struct vec2 b);
+
+float vec2_dot(struct vec2 a, struct vec2 b);
+
+float vec2_det(struct vec2 a, struct vec2 b);
+
 #endif
\ No newline at end of file
diff --git a/src/vector.c b/src/vector.c
index 8536259..dd8b221 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -1,6 +1,73 @@
 #include "curtle/vector.h"
+#include <math.h>
 
-struct vec2 vec2_add(struct vec2 a, struct vec2 b)
+struct vec2 vec2_add(const struct vec2 a, const struct vec2 b)
 {
-    return (struct vec2){a.x + b.x, a.y + b.y};
+	return (struct vec2){ a.x + b.x, a.y + b.y };
+}
+
+struct vec2 vec2_sub(const struct vec2 a, const struct vec2 b)
+{
+	return (struct vec2){ a.x - b.x, a.y - b.y };
+}
+
+float vec2_dot(const struct vec2 a, const struct vec2 b)
+{
+	return a.x * b.x + a.y * b.y;
+}
+
+float vec2_det(const struct vec2 a, const struct vec2 b)
+{
+	return a.x * b.y - a.y * b.x;
+}
+
+struct vec2 vec2_scale(const struct vec2 v, const float s)
+{
+	return (struct vec2){ v.x * s, v.y * s };
+}
+
+float vec2_len(const struct vec2 v)
+{
+	return sqrtf(v.x * v.x + v.y * v.y);
+}
+
+struct vec2 vec2_normalize(const struct vec2 v)
+{
+	return vec2_scale(v, 1.0f / vec2_len(v));
+}
+
+struct vec3 vec3_add(const struct vec3 a, const struct vec3 b)
+{
+	return (struct vec3){ a.x + b.x, a.y + b.y, a.z + b.z };
+}
+
+struct vec3 vec3_sub(const struct vec3 a, const struct vec3 b)
+{
+	return (struct vec3){ a.x - b.x, a.y - b.y, a.z - b.z };
+}
+
+float vec3_dot(const struct vec3 a, const struct vec3 b)
+{
+	return a.x * b.x + a.y * b.y + a.z * b.z;
+}
+
+struct vec3 vec3_cross(const struct vec3 a, const struct vec3 b)
+{
+	return (struct vec3){ a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z,
+	                      a.x * b.y - a.y * b.x };
+}
+
+struct vec3 vec3_scale(const struct vec3 v, const float s)
+{
+	return (struct vec3){ v.x * s, v.y * s, v.z * s };
+}
+
+float vec3_len(const struct vec3 v)
+{
+	return sqrtf(v.x * v.x + v.y * v.y + v.z * v.z);
+}
+
+struct vec3 vec3_normalize(const struct vec3 v)
+{
+	return vec3_scale(v, 1.0f / vec3_len(v));
 }
\ No newline at end of file
diff --git a/tests/test_vector.c b/tests/test_vector.c
index b0341da..8e8e69c 100644
--- a/tests/test_vector.c
+++ b/tests/test_vector.c
@@ -3,11 +3,11 @@
 
 int main()
 {
-    struct vec2 a = {1, 2};
-    struct vec2 b = {3, 4};
+	struct vec2 a = { 1, 2 };
+	struct vec2 b = { 3, 4 };
 
-    struct vec2 r = vec2_add(a, b);
+	struct vec2 r = vec2_add(a, b);
 
-    assert(r.x == 4);
-    assert(r.y == 6);
+	assert(r.x == 4);
+	assert(r.y == 6);
 }
\ No newline at end of file