1 /* 2 * Copyright (c) 2006-2011 Erin Catto http://www.box2d.org 3 * 4 * This software is provided 'as-is', without any express or implied 5 * warranty. In no event will the authors be held liable for any damages 6 * arising from the use of this software. 7 * Permission is granted to anyone to use this software for any purpose, 8 * including commercial applications, and to alter it and redistribute it 9 * freely, subject to the following restrictions: 10 * 1. The origin of this software must not be misrepresented; you must not 11 * claim that you wrote the original software. If you use this software 12 * in a product, an acknowledgment in the product documentation would be 13 * appreciated but is not required. 14 * 2. Altered source versions must be plainly marked as such, and must not be 15 * misrepresented as being the original software. 16 * 3. This notice may not be removed or altered from any source distribution. 17 */ 18 19 #ifndef B2_TIME_STEP_H 20 #define B2_TIME_STEP_H 21 22 #include <Box2D/Common/b2Math.h> 23 24 /// Profiling data. Times are in milliseconds. 25 struct b2Profile 26 { 27 float32 step; 28 float32 collide; 29 float32 solve; 30 float32 solveInit; 31 float32 solveVelocity; 32 float32 solvePosition; 33 float32 broadphase; 34 float32 solveTOI; 35 }; 36 37 /// This is an internal structure. 38 struct b2TimeStep 39 { 40 float32 dt; // time step 41 float32 inv_dt; // inverse time step (0 if dt == 0). 42 float32 dtRatio; // dt * inv_dt0 43 int32 velocityIterations; 44 int32 positionIterations; 45 bool warmStarting; 46 }; 47 48 /// This is an internal structure. 49 struct b2Position 50 { 51 b2Vec2 c; 52 float32 a; 53 }; 54 55 /// This is an internal structure. 56 struct b2Velocity 57 { 58 b2Vec2 v; 59 float32 w; 60 }; 61 62 /// Solver Data 63 struct b2SolverData 64 { 65 b2TimeStep step; 66 b2Position* positions; 67 b2Velocity* velocities; 68 }; 69 70 #endif 71
