1 files changed, 59 insertions, 0 deletions
diff --git a/Source/Math/overgrowth_geometry.h b/Source/Math/overgrowth_geometry.h
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+++ b/Source/Math/overgrowth_geometry.h
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+//-----------------------------------------------------------------------------
+//           Name: overgrowth_geometry.h
+//      Developer: Wolfire Games LLC
+//         Author: Phillip Isola
+//    Description: Simple geometry primitives and calculations
+//        License: Read below
+//-----------------------------------------------------------------------------
+//
+//   Copyright 2022 Wolfire Games LLC
+//
+//   Licensed under the Apache License, Version 2.0 (the "License");
+//   you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+//
+//-----------------------------------------------------------------------------
+#pragma once
+
+#include <Math/vec3.h>
+#include <Math/vec4.h>
+
+struct LineSegment {
+    vec3 start;
+    vec3 end;
+};
+
+class Box {
+public:    
+    static const int NUM_FACES = 6;
+    static const int NUM_POINTS = 8;
+    vec3 center;
+    vec3 dims;
+
+    int lineCheck(const vec3& start, const vec3& end, vec3* point, vec3* normal);
+    int GetNearestPointIndex(const vec3& point, float& dist) const;
+    int GetHitFaceIndex(const vec3& normal, const vec3& poin) const;    // returns -1 if none hit
+    bool IsInFace(const vec3& point, int which_face, float proportion_offset) const;
+    vec3 GetPoint(int index) const;
+    static vec3 GetPlaneNormal(int index);
+    static vec3 GetPlaneTangent(int index);
+    static vec3 GetPlaneBitangent(int index);
+    vec3 GetPlanePoint(int index) const;
+    bool operator==(const Box& other);
+
+private:
+    float lineCheckFace(const vec3& start, const vec3& end, vec3* point, vec3* normal, int which_face);
+};
+
+bool LineLineIntersect(vec3 p1, vec3 p2, vec3 p3, vec3 p4, vec3* pa, vec3* pb);
+float RayPlaneIntersection(const vec3& start, const vec3& dir, const vec3& p, const vec3& n);
+bool RayLineClosestPoint(vec3 start, vec3 dir, vec3 p, vec3 n, vec3* closest_point);
+float GetAngleBetween(const vec3& v1, const vec3& v2);