Update Files

lib/haxebullet/bullet/BulletCollision/Gimpact/btClipPolygon.h

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+#ifndef BT_CLIP_POLYGON_H_INCLUDED
+#define BT_CLIP_POLYGON_H_INCLUDED
+
+/*! \file btClipPolygon.h
+\author Francisco Leon Najera
+*/
+/*
+This source file is part of GIMPACT Library.
+
+For the latest info, see http://gimpact.sourceforge.net/
+
+Copyright (c) 2007 Francisco Leon Najera. C.C. 80087371.
+email: projectileman@yahoo.com
+
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it freely,
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "LinearMath/btTransform.h"
+#include "LinearMath/btGeometryUtil.h"
+
+
+SIMD_FORCE_INLINE btScalar bt_distance_point_plane(const btVector4 & plane,const btVector3 &point)
+{
+	return point.dot(plane) - plane[3];
+}
+
+/*! Vector blending
+Takes two vectors a, b, blends them together*/
+SIMD_FORCE_INLINE void bt_vec_blend(btVector3 &vr, const btVector3 &va,const btVector3 &vb, btScalar blend_factor)
+{
+	vr = (1-blend_factor)*va + blend_factor*vb;
+}
+
+//! This function calcs the distance from a 3D plane
+SIMD_FORCE_INLINE void bt_plane_clip_polygon_collect(
+						const btVector3 & point0,
+						const btVector3 & point1,
+						btScalar dist0,
+						btScalar dist1,
+						btVector3 * clipped,
+						int & clipped_count)
+{
+	bool _prevclassif = (dist0>SIMD_EPSILON);
+	bool _classif = (dist1>SIMD_EPSILON);
+	if(_classif!=_prevclassif)
+	{
+		btScalar blendfactor = -dist0/(dist1-dist0);
+		bt_vec_blend(clipped[clipped_count],point0,point1,blendfactor);
+		clipped_count++;
+	}
+	if(!_classif)
+	{
+		clipped[clipped_count] = point1;
+		clipped_count++;
+	}
+}
+
+
+//! Clips a polygon by a plane
+/*!
+*\return The count of the clipped counts
+*/
+SIMD_FORCE_INLINE int bt_plane_clip_polygon(
+						const btVector4 & plane,
+						const btVector3 * polygon_points,
+						int polygon_point_count,
+						btVector3 * clipped)
+{
+    int clipped_count = 0;
+
+
+    //clip first point
+	btScalar firstdist = bt_distance_point_plane(plane,polygon_points[0]);;
+	if(!(firstdist>SIMD_EPSILON))
+	{
+		clipped[clipped_count] = polygon_points[0];
+		clipped_count++;
+	}
+
+	btScalar olddist = firstdist;
+	for(int i=1;i<polygon_point_count;i++)
+	{
+		btScalar dist = bt_distance_point_plane(plane,polygon_points[i]);
+
+		bt_plane_clip_polygon_collect(
+						polygon_points[i-1],polygon_points[i],
+						olddist,
+						dist,
+						clipped,
+						clipped_count);
+
+
+		olddist = dist;
+	}
+
+	//RETURN TO FIRST  point
+
+	bt_plane_clip_polygon_collect(
+					polygon_points[polygon_point_count-1],polygon_points[0],
+					olddist,
+					firstdist,
+					clipped,
+					clipped_count);
+
+	return clipped_count;
+}
+
+//! Clips a polygon by a plane
+/*!
+*\param clipped must be an array of 16 points.
+*\return The count of the clipped counts
+*/
+SIMD_FORCE_INLINE int bt_plane_clip_triangle(
+						const btVector4 & plane,
+						const btVector3 & point0,
+						const btVector3 & point1,
+						const btVector3& point2,
+						btVector3 * clipped // an allocated array of 16 points at least
+						)
+{
+    int clipped_count = 0;
+
+    //clip first point0
+	btScalar firstdist = bt_distance_point_plane(plane,point0);;
+	if(!(firstdist>SIMD_EPSILON))
+	{
+		clipped[clipped_count] = point0;
+		clipped_count++;
+	}
+
+	// point 1
+	btScalar olddist = firstdist;
+	btScalar dist = bt_distance_point_plane(plane,point1);
+
+	bt_plane_clip_polygon_collect(
+					point0,point1,
+					olddist,
+					dist,
+					clipped,
+					clipped_count);
+
+	olddist = dist;
+
+
+	// point 2
+	dist = bt_distance_point_plane(plane,point2);
+
+	bt_plane_clip_polygon_collect(
+					point1,point2,
+					olddist,
+					dist,
+					clipped,
+					clipped_count);
+	olddist = dist;
+
+
+
+	//RETURN TO FIRST  point0
+	bt_plane_clip_polygon_collect(
+					point2,point0,
+					olddist,
+					firstdist,
+					clipped,
+					clipped_count);
+
+	return clipped_count;
+}
+
+
+
+
+
+#endif // GIM_TRI_COLLISION_H_INCLUDED