1 files changed, 157 insertions, 0 deletions
diff --git a/src/core/Collision.h b/src/core/Collision.h
new file mode 100644
index 00000000..5a9058d3
--- /dev/null
+++ b/src/core/Collision.h
@@ -0,0 +1,157 @@
+#pragma once
+
+#include "templates.h"
+#include "Game.h"	// for eLevelName
+
+struct CColSphere
+{
+	CVector center;
+	float radius;
+	uint8 surface;
+	uint8 piece;
+
+	void Set(float radius, const CVector &center, uint8 surf, uint8 piece);
+	void Set(float radius, const CVector &center) { this->center = center; this->radius = radius; }
+};
+
+struct CColBox
+{
+	CVector min;
+	CVector max;
+	uint8 surface;
+	uint8 piece;
+
+	void Set(const CVector &min, const CVector &max, uint8 surf, uint8 piece);
+	CVector GetSize(void) { return max - min; }
+};
+
+struct CColLine
+{
+	CVector p0;
+	int pad0;
+	CVector p1;
+	int pad1;
+
+	CColLine(void) { };
+	CColLine(const CVector &p0, const CVector &p1) { this->p0 = p0; this->p1 = p1; };
+	void Set(const CVector &p0, const CVector &p1);
+
+	CColLine *ctor(CVector *p0, CVector *p1) { return ::new (this) CColLine(*p0, *p1); }
+};
+
+struct CColTriangle
+{
+	uint16 a;
+	uint16 b;
+	uint16 c;
+	uint8 surface;
+
+	void Set(const CVector *v, int a, int b, int c, uint8 surf, uint8 piece);
+};
+
+struct CColTrianglePlane
+{
+	CVector normal;
+	float dist;
+	uint8 dir;
+
+	void Set(const CVector *v, CColTriangle &tri);
+	void GetNormal(CVector &n) const { n = normal; }
+	float CalcPoint(const CVector &v) const { return DotProduct(normal, v) - dist; };
+};
+
+struct CColPoint
+{
+	CVector point;
+	int pad1;
+	// the surface normal on the surface of point
+	CVector normal;
+	int pad2;
+	uint8 surfaceA;
+	uint8 pieceA;
+	uint8 surfaceB;
+	uint8 pieceB;
+	float depth;
+};
+
+struct CStoredCollPoly
+{
+	CVector verts[3];
+	bool valid;
+};
+
+struct CColModel
+{
+	CColSphere boundingSphere;
+	CColBox boundingBox;
+	short numSpheres;
+	short numLines;
+	short numBoxes;
+	short numTriangles;
+	int level;
+	bool ownsCollisionVolumes;
+	CColSphere *spheres;
+	CColLine *lines;
+	CColBox *boxes;
+	CVector *vertices;
+	CColTriangle *triangles;
+	CColTrianglePlane *trianglePlanes;
+
+	CColModel(void);
+	~CColModel(void);
+	void RemoveCollisionVolumes(void);
+	void CalculateTrianglePlanes(void);
+	void RemoveTrianglePlanes(void);
+	CLink<CColModel*> *GetLinkPtr(void);
+	void SetLinkPtr(CLink<CColModel*>*);
+	void GetTrianglePoint(CVector &v, int i) const;
+
+	CColModel *ctor(void) { return ::new (this) CColModel(); }
+	void dtor(void) { this->CColModel::~CColModel(); }
+	CColModel& operator=(const CColModel& other);
+};
+
+class CCollision
+{
+public:
+	static eLevelName &ms_collisionInMemory;
+	static CLinkList<CColModel*> &ms_colModelCache;
+
+	static void Init(void);
+	static void Shutdown(void);
+	static void Update(void);
+	static void LoadCollisionWhenINeedIt(bool changeLevel);
+	static void SortOutCollisionAfterLoad(void);
+	static void LoadCollisionScreen(eLevelName level);
+	static void DrawColModel(const CMatrix &mat, const CColModel &colModel);
+	static void DrawColModel_Coloured(const CMatrix &mat, const CColModel &colModel, int32 id);
+
+	static void CalculateTrianglePlanes(CColModel *model);
+
+	// all these return true if there's a collision
+	static bool TestSphereSphere(const CColSphere &s1, const CColSphere &s2);
+	static bool TestSphereBox(const CColSphere &sph, const CColBox &box);
+	static bool TestLineBox(const CColLine &line, const CColBox &box);
+	static bool TestVerticalLineBox(const CColLine &line, const CColBox &box);
+	static bool TestLineTriangle(const CColLine &line, const CVector *verts, const CColTriangle &tri, const CColTrianglePlane &plane);
+	static bool TestLineSphere(const CColLine &line, const CColSphere &sph);
+	static bool TestSphereTriangle(const CColSphere &sphere, const CVector *verts, const CColTriangle &tri, const CColTrianglePlane &plane);
+	static bool TestLineOfSight(const CColLine &line, const CMatrix &matrix, CColModel &model, bool ignoreSeeThrough);
+
+	static bool ProcessSphereSphere(const CColSphere &s1, const CColSphere &s2, CColPoint &point, float &mindistsq);
+	static bool ProcessSphereBox(const CColSphere &sph, const CColBox &box, CColPoint &point, float &mindistsq);
+	static bool ProcessLineBox(const CColLine &line, const CColBox &box, CColPoint &point, float &mindist);
+	static bool ProcessVerticalLineTriangle(const CColLine &line, const CVector *verts, const CColTriangle &tri, const CColTrianglePlane &plane, CColPoint &point, float &mindist, CStoredCollPoly *poly);
+	static bool ProcessLineTriangle(const CColLine &line , const CVector *verts, const CColTriangle &tri, const CColTrianglePlane &plane, CColPoint &point, float &mindist);
+	static bool ProcessLineSphere(const CColLine &line, const CColSphere &sphere, CColPoint &point, float &mindist);
+	static bool ProcessSphereTriangle(const CColSphere &sph, const CVector *verts, const CColTriangle &tri, const CColTrianglePlane &plane, CColPoint &point, float &mindistsq);
+	static bool ProcessLineOfSight(const CColLine &line, const CMatrix &matrix, CColModel &model, CColPoint &point, float &mindist, bool ignoreSeeThrough);
+	static bool ProcessVerticalLine(const CColLine &line, const CMatrix &matrix, CColModel &model, CColPoint &point, float &mindist, bool ignoreSeeThrough, CStoredCollPoly *poly);
+	static int32 ProcessColModels(const CMatrix &matrix1, CColModel &model1, const CMatrix &matrix2, CColModel &model2, CColPoint *point1, CColPoint *point2, float *linedists);
+
+	// TODO:
+	// CCollision::IsStoredPolyStillValidVerticalLine
+
+	static float DistToLine(const CVector *l0, const CVector *l1, const CVector *point);
+	static float DistToLine(const CVector *l0, const CVector *l1, const CVector *point, CVector &closest);
+};