1 files changed, 218 insertions, 0 deletions
diff --git a/thirdparty/bullet/src/BulletCollision/Gimpact/btTriangleShapeEx.cpp b/thirdparty/bullet/src/BulletCollision/Gimpact/btTriangleShapeEx.cpp
new file mode 100644
index 0000000000..ca76cc54a1
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+++ b/thirdparty/bullet/src/BulletCollision/Gimpact/btTriangleShapeEx.cpp
@@ -0,0 +1,218 @@
+/*! \file btGImpactTriangleShape.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 "btTriangleShapeEx.h"
+
+
+
+void GIM_TRIANGLE_CONTACT::merge_points(const btVector4 & plane,
+                                       btScalar margin, const btVector3 * points, int point_count)
+{
+    m_point_count = 0;
+    m_penetration_depth= -1000.0f;
+
+    int point_indices[MAX_TRI_CLIPPING];
+
+	int _k;
+
+    for ( _k=0;_k<point_count;_k++)
+    {
+        btScalar _dist = - bt_distance_point_plane(plane,points[_k]) + margin;
+
+        if (_dist>=0.0f)
+        {
+            if (_dist>m_penetration_depth)
+            {
+                m_penetration_depth = _dist;
+                point_indices[0] = _k;
+                m_point_count=1;
+            }
+            else if ((_dist+SIMD_EPSILON)>=m_penetration_depth)
+            {
+                point_indices[m_point_count] = _k;
+                m_point_count++;
+            }
+        }
+    }
+
+    for ( _k=0;_k<m_point_count;_k++)
+    {
+        m_points[_k] = points[point_indices[_k]];
+    }
+}
+
+///class btPrimitiveTriangle
+bool btPrimitiveTriangle::overlap_test_conservative(const btPrimitiveTriangle& other)
+{
+    btScalar total_margin = m_margin + other.m_margin;
+    // classify points on other triangle
+    btScalar dis0 = bt_distance_point_plane(m_plane,other.m_vertices[0]) - total_margin;
+
+    btScalar dis1 = bt_distance_point_plane(m_plane,other.m_vertices[1]) - total_margin;
+
+    btScalar dis2 = bt_distance_point_plane(m_plane,other.m_vertices[2]) - total_margin;
+
+    if (dis0>0.0f&&dis1>0.0f&&dis2>0.0f) return false;
+
+    // classify points on this triangle
+    dis0 = bt_distance_point_plane(other.m_plane,m_vertices[0]) - total_margin;
+
+    dis1 = bt_distance_point_plane(other.m_plane,m_vertices[1]) - total_margin;
+
+    dis2 = bt_distance_point_plane(other.m_plane,m_vertices[2]) - total_margin;
+
+    if (dis0>0.0f&&dis1>0.0f&&dis2>0.0f) return false;
+
+    return true;
+}
+
+int btPrimitiveTriangle::clip_triangle(btPrimitiveTriangle & other, btVector3 * clipped_points )
+{
+    // edge 0
+
+    btVector3 temp_points[MAX_TRI_CLIPPING];
+
+
+    btVector4 edgeplane;
+
+    get_edge_plane(0,edgeplane);
+
+
+    int clipped_count = bt_plane_clip_triangle(
+                            edgeplane,other.m_vertices[0],other.m_vertices[1],other.m_vertices[2],temp_points);
+
+    if (clipped_count == 0) return 0;
+
+    btVector3 temp_points1[MAX_TRI_CLIPPING];
+
+
+    // edge 1
+    get_edge_plane(1,edgeplane);
+
+
+    clipped_count = bt_plane_clip_polygon(edgeplane,temp_points,clipped_count,temp_points1);
+
+    if (clipped_count == 0) return 0;
+
+    // edge 2
+    get_edge_plane(2,edgeplane);
+
+    clipped_count = bt_plane_clip_polygon(
+                        edgeplane,temp_points1,clipped_count,clipped_points);
+
+    return clipped_count;
+}
+
+bool btPrimitiveTriangle::find_triangle_collision_clip_method(btPrimitiveTriangle & other, GIM_TRIANGLE_CONTACT & contacts)
+{
+    btScalar margin = m_margin + other.m_margin;
+
+    btVector3 clipped_points[MAX_TRI_CLIPPING];
+    int clipped_count;
+    //create planes
+    // plane v vs U points
+
+    GIM_TRIANGLE_CONTACT contacts1;
+
+    contacts1.m_separating_normal = m_plane;
+
+
+    clipped_count = clip_triangle(other,clipped_points);
+
+    if (clipped_count == 0 )
+    {
+        return false;//Reject
+    }
+
+    //find most deep interval face1
+    contacts1.merge_points(contacts1.m_separating_normal,margin,clipped_points,clipped_count);
+    if (contacts1.m_point_count == 0) return false; // too far
+    //Normal pointing to this triangle
+    contacts1.m_separating_normal *= -1.f;
+
+
+    //Clip tri1 by tri2 edges
+    GIM_TRIANGLE_CONTACT contacts2;
+    contacts2.m_separating_normal = other.m_plane;
+
+    clipped_count = other.clip_triangle(*this,clipped_points);
+
+    if (clipped_count == 0 )
+    {
+        return false;//Reject
+    }
+
+    //find most deep interval face1
+    contacts2.merge_points(contacts2.m_separating_normal,margin,clipped_points,clipped_count);
+    if (contacts2.m_point_count == 0) return false; // too far
+
+
+
+
+    ////check most dir for contacts
+    if (contacts2.m_penetration_depth<contacts1.m_penetration_depth)
+    {
+        contacts.copy_from(contacts2);
+    }
+    else
+    {
+        contacts.copy_from(contacts1);
+    }
+    return true;
+}
+
+
+
+///class btTriangleShapeEx: public btTriangleShape
+
+bool btTriangleShapeEx::overlap_test_conservative(const btTriangleShapeEx& other)
+{
+    btScalar total_margin = getMargin() + other.getMargin();
+
+    btVector4 plane0;
+    buildTriPlane(plane0);
+    btVector4 plane1;
+    other.buildTriPlane(plane1);
+
+    // classify points on other triangle
+    btScalar dis0 = bt_distance_point_plane(plane0,other.m_vertices1[0]) - total_margin;
+
+    btScalar dis1 = bt_distance_point_plane(plane0,other.m_vertices1[1]) - total_margin;
+
+    btScalar dis2 = bt_distance_point_plane(plane0,other.m_vertices1[2]) - total_margin;
+
+    if (dis0>0.0f&&dis1>0.0f&&dis2>0.0f) return false;
+
+    // classify points on this triangle
+    dis0 = bt_distance_point_plane(plane1,m_vertices1[0]) - total_margin;
+
+    dis1 = bt_distance_point_plane(plane1,m_vertices1[1]) - total_margin;
+
+    dis2 = bt_distance_point_plane(plane1,m_vertices1[2]) - total_margin;
+
+    if (dis0>0.0f&&dis1>0.0f&&dis2>0.0f) return false;
+
+    return true;
+}
+
+