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b2TimeStep.h

    00001 /*
    00002 * Copyright (c) 2006-2011 Erin Catto http://www.box2d.org
    00003 *
    00004 * This software is provided 'as-is', without any express or implied
    00005 * warranty.  In no event will the authors be held liable for any damages
    00006 * arising from the use of this software.
    00007 * Permission is granted to anyone to use this software for any purpose,
    00008 * including commercial applications, and to alter it and redistribute it
    00009 * freely, subject to the following restrictions:
    00010 * 1. The origin of this software must not be misrepresented; you must not
    00011 * claim that you wrote the original software. If you use this software
    00012 * in a product, an acknowledgment in the product documentation would be
    00013 * appreciated but is not required.
    00014 * 2. Altered source versions must be plainly marked as such, and must not be
    00015 * misrepresented as being the original software.
    00016 * 3. This notice may not be removed or altered from any source distribution.
    00017 */
    00018
    00019 #ifndef B2_TIME_STEP_H
    00020 #define B2_TIME_STEP_H
    00021
    00022 #include <Box2D/Common/b2Math.h>
    00023
    00025 struct b2Profile
    00026 {
    00027         float32 step;
    00028         float32 collide;
    00029         float32 solve;
    00030         float32 solveInit;
    00031         float32 solveVelocity;
    00032         float32 solvePosition;
    00033         float32 broadphase;
    00034         float32 solveTOI;
    00035 };
    00036
    00038 struct b2TimeStep
    00039 {
    00040         float32 dt;                     // time step
    00041         float32 inv_dt;         // inverse time step (0 if dt == 0).
    00042         float32 dtRatio;        // dt * inv_dt0
    00043         int32 velocityIterations;
    00044         int32 positionIterations;
    00045         bool warmStarting;
    00046 };
    00047
    00049 struct b2Position
    00050 {
    00051         b2Vec2 c;
    00052         float32 a;
    00053 };
    00054
    00056 struct b2Velocity
    00057 {
    00058         b2Vec2 v;
    00059         float32 w;
    00060 };
    00061
    00063 struct b2SolverData
    00064 {
    00065         b2TimeStep step;
    00066         b2Position* positions;
    00067         b2Velocity* velocities;
    00068 };
    00069
    00070 #endif

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