From 9306828192644cf367aeec30c00cc6bc178edb62 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Thu, 8 Feb 2024 07:53:43 -0800
Subject: Add AABB.

---
 include/math/aabb2.h | 35 +++++++++++++++++++++++++++++++++++
 include/math/aabb3.h | 35 +++++++++++++++++++++++++++++++++++
 include/math/fwd.h   |  2 ++
 3 files changed, 72 insertions(+)
 create mode 100644 include/math/aabb2.h
 create mode 100644 include/math/aabb3.h

diff --git a/include/math/aabb2.h b/include/math/aabb2.h
new file mode 100644
index 0000000..edb6cb6
--- /dev/null
+++ b/include/math/aabb2.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "vec2.h"
+
+#include <stddef.h>
+
+typedef struct aabb2 {
+  vec2 min;
+  vec2 max;
+} aabb2;
+
+/// Construct an AABB from min and max bounds.
+static inline aabb2 aabb2_make(vec2 min, vec2 max) {
+  return (aabb2){.min = min, .max = max};
+}
+
+/// Construct an AABB from an array of points.
+static inline aabb2 aabb2_from_array(const vec2 points[], size_t count) {
+  aabb2 box = (aabb2){0};
+  for (size_t i = 0; i < count; ++i) {
+    box.min = vec2_min(box.min, points[i]);
+    box.max = vec2_max(box.max, points[i]);
+  }
+  return box;
+}
+
+/// Add a point to the AABB. The AABB grows to contain the point.
+static inline aabb2 aabb2_add(aabb2 box, vec2 p) {
+  return (aabb2){.min = vec2_min(box.min, p), .max = vec2_max(box.max, p)};
+}
+
+/// Return the AABB of two AABBs.
+static inline aabb2 aabb2_sum(aabb2 a, aabb2 b) {
+  return (aabb2){.min = vec2_min(a.min, b.min), .max = vec2_max(a.max, b.max)};
+}
diff --git a/include/math/aabb3.h b/include/math/aabb3.h
new file mode 100644
index 0000000..0b0005c
--- /dev/null
+++ b/include/math/aabb3.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "vec3.h"
+
+#include <stddef.h>
+
+typedef struct aabb3 {
+  vec3 min;
+  vec3 max;
+} aabb3;
+
+/// Construct an AABB from min and max bounds.
+static inline aabb3 aabb3_make(vec3 min, vec3 max) {
+  return (aabb3){.min = min, .max = max};
+}
+
+/// Construct an AABB from an array of points.
+static inline aabb3 aabb3_from_array(const vec3 points[], size_t count) {
+  aabb3 box = (aabb3){0};
+  for (size_t i = 0; i < count; ++i) {
+    box.min = vec3_min(box.min, points[i]);
+    box.max = vec3_max(box.max, points[i]);
+  }
+  return box;
+}
+
+/// Add a point to the AABB. The AABB grows to contain the point.
+static inline aabb3 aabb3_add(aabb3 box, vec3 p) {
+  return (aabb3){.min = vec3_min(box.min, p), .max = vec3_max(box.max, p)};
+}
+
+/// Return the AABB of two AABBs.
+static inline aabb3 aabb3_sum(aabb3 a, aabb3 b) {
+  return (aabb3){.min = vec3_min(a.min, b.min), .max = vec3_max(a.max, b.max)};
+}
diff --git a/include/math/fwd.h b/include/math/fwd.h
index d70817a..283f821 100644
--- a/include/math/fwd.h
+++ b/include/math/fwd.h
@@ -1,6 +1,8 @@
 /// Forward declarations for all math objects.
 #pragma once
 
+typedef struct aabb2    aabb2;
+typedef struct aabb3    aabb3;
 typedef struct Camera   Camera;
 typedef struct mat4     mat4;
 typedef struct quat     quat;
-- 
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