/*
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* Java port of Bullet (c) 2008 Martin Dvorak <jezek2@advel.cz>
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*
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* Bullet Continuous Collision Detection and Physics Library
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* Copyright (c) 2003-2008 Erwin Coumans http://www.bulletphysics.com/
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*
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* This software is provided 'as-is', without any express or implied warranty.
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* In no event will the authors be held liable for any damages arising from
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* the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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package com.bulletphysics.collision.shapes;
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import com.bulletphysics.linearmath.VectorUtil;
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import cz.advel.stack.Stack;
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import javax.vecmath.Vector3f;
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/**
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* StridingMeshInterface is the abstract class for high performance access to
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* triangle meshes. It allows for sharing graphics and collision meshes. Also
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* it provides locking/unlocking of graphics meshes that are in GPU memory.
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*
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* @author jezek2
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*/
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public abstract class StridingMeshInterface {
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protected final Vector3f scaling = new Vector3f(1f, 1f, 1f);
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public void internalProcessAllTriangles(InternalTriangleIndexCallback callback, Vector3f aabbMin, Vector3f aabbMax) {
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int graphicssubparts = getNumSubParts();
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Vector3f[] triangle/*[3]*/ = new Vector3f[]{ Stack.alloc(Vector3f.class), Stack.alloc(Vector3f.class), Stack.alloc(Vector3f.class) };
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Vector3f meshScaling = getScaling(Stack.alloc(Vector3f.class));
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for (int part=0; part<graphicssubparts; part++) {
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VertexData data = getLockedReadOnlyVertexIndexBase(part);
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for (int i=0, cnt=data.getIndexCount()/3; i<cnt; i++) {
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data.getTriangle(i*3, meshScaling, triangle);
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callback.internalProcessTriangleIndex(triangle, part, i);
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}
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unLockReadOnlyVertexBase(part);
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}
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}
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private static class AabbCalculationCallback extends InternalTriangleIndexCallback {
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public final Vector3f aabbMin = new Vector3f(1e30f, 1e30f, 1e30f);
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public final Vector3f aabbMax = new Vector3f(-1e30f, -1e30f, -1e30f);
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public void internalProcessTriangleIndex(Vector3f[] triangle, int partId, int triangleIndex) {
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VectorUtil.setMin(aabbMin, triangle[0]);
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VectorUtil.setMax(aabbMax, triangle[0]);
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VectorUtil.setMin(aabbMin, triangle[1]);
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VectorUtil.setMax(aabbMax, triangle[1]);
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VectorUtil.setMin(aabbMin, triangle[2]);
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VectorUtil.setMax(aabbMax, triangle[2]);
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}
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}
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public void calculateAabbBruteForce(Vector3f aabbMin, Vector3f aabbMax) {
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// first calculate the total aabb for all triangles
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AabbCalculationCallback aabbCallback = new AabbCalculationCallback();
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aabbMin.set(-1e30f, -1e30f, -1e30f);
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aabbMax.set(1e30f, 1e30f, 1e30f);
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internalProcessAllTriangles(aabbCallback, aabbMin, aabbMax);
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aabbMin.set(aabbCallback.aabbMin);
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aabbMax.set(aabbCallback.aabbMax);
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}
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/**
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* Get read and write access to a subpart of a triangle mesh.
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* This subpart has a continuous array of vertices and indices.
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* In this way the mesh can be handled as chunks of memory with striding
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* very similar to OpenGL vertexarray support.
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* Make a call to unLockVertexBase when the read and write access is finished.
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*/
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public abstract VertexData getLockedVertexIndexBase(int subpart/*=0*/);
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public abstract VertexData getLockedReadOnlyVertexIndexBase(int subpart/*=0*/);
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/**
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* unLockVertexBase finishes the access to a subpart of the triangle mesh.
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* Make a call to unLockVertexBase when the read and write access (using getLockedVertexIndexBase) is finished.
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*/
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public abstract void unLockVertexBase(int subpart);
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public abstract void unLockReadOnlyVertexBase(int subpart);
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/**
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* getNumSubParts returns the number of seperate subparts.
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* Each subpart has a continuous array of vertices and indices.
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*/
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public abstract int getNumSubParts();
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public abstract void preallocateVertices(int numverts);
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public abstract void preallocateIndices(int numindices);
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public Vector3f getScaling(Vector3f out) {
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out.set(scaling);
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return out;
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}
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public void setScaling(Vector3f scaling) {
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this.scaling.set(scaling);
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}
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}
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