From f8b92ce3aa08b1445c9f956d8166830946562d12 Mon Sep 17 00:00:00 2001 From: navewindre Date: Wed, 3 Sep 2025 20:10:09 +0200 Subject: a --- src/util/aabb.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 src/util/aabb.h (limited to 'src/util/aabb.h') diff --git a/src/util/aabb.h b/src/util/aabb.h new file mode 100644 index 0000000..f2fd251 --- /dev/null +++ b/src/util/aabb.h @@ -0,0 +1,30 @@ +#pragma once + +#include "vector.h" + +struct AABB { + VEC3 min; + VEC3 max; +}; + +inline VEC3 aabb_center( const AABB& aabb ) { return (aabb.min + aabb.max) * 0.5f; } +inline VEC3 aabb_half( const AABB& aabb ) { return (aabb.max - aabb.min) * 0.5f; } +inline F32 aabb_support_radius( const AABB& aabb, const VEC3& dir ) { + VEC3 half = aabb_half( aabb ); + return fabsf(dir.x) * half.x + fabsf(dir.y) * half.y + fabsf(dir.z) * half.z; +} + +inline VEC2 aabb_extend_at_feet( const AABB& aabb, const VEC3& dir ) { + VEC3 half = aabb_half( aabb ); + + F32 hx = half.x; + F32 hy = half.y; + F32 hz = half.z * 2; + + F32 lateral = fabsf( dir.x ) * hx + fabsf( dir.y ) * hy; + + F32 pos_z = dir.z > 0 ? dir.z * hz : 0.f; + F32 neg_z = dir.z < 0 ? (-dir.z) * hz : 0.f; + + return { lateral + pos_z, lateral + neg_z }; +} -- cgit v1.2.3