mirror of https://github.com/axmolengine/axmol.git
143 lines
4.4 KiB
C++
143 lines
4.4 KiB
C++
/*
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Bullet Continuous Collision Detection and Physics Library
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Copyright (c) 2003-2013 Erwin Coumans http://bulletphysics.org
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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 the use of this software.
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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 freely,
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subject to the following restrictions:
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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.
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2. Altered source versions must be plainly marked as such, and must not be 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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///original version written by Erwin Coumans, October 2013
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#ifndef BT_PATH_SOLVER_H
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#define BT_PATH_SOLVER_H
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//#define BT_USE_PATH
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#ifdef BT_USE_PATH
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extern "C"
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{
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#include "PATH/SimpleLCP.h"
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#include "PATH/License.h"
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#include "PATH/Error_Interface.h"
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};
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void __stdcall MyError(Void *data, Char *msg)
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{
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printf("Path Error: %s\n", msg);
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}
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void __stdcall MyWarning(Void *data, Char *msg)
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{
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printf("Path Warning: %s\n", msg);
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}
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Error_Interface e;
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#include "btMLCPSolverInterface.h"
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#include "Dantzig/lcp.h"
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class btPathSolver : public btMLCPSolverInterface
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{
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public:
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btPathSolver()
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{
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License_SetString("2069810742&Courtesy_License&&&USR&2013&14_12_2011&1000&PATH&GEN&31_12_2013&0_0_0&0&0_0");
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e.error_data = 0;
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e.warning = MyWarning;
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e.error = MyError;
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Error_SetInterface(&e);
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}
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virtual bool solveMLCP(const btMatrixXu &A, const btVectorXu &b, btVectorXu &x, const btVectorXu &lo, const btVectorXu &hi, const btAlignedObjectArray<int> &limitDependency, int numIterations, bool useSparsity = true)
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{
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MCP_Termination status;
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int numVariables = b.rows();
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if (0 == numVariables)
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return true;
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/* - variables - the number of variables in the problem
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- m_nnz - the number of nonzeros in the M matrix
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- m_i - a vector of size m_nnz containing the row indices for M
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- m_j - a vector of size m_nnz containing the column indices for M
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- m_ij - a vector of size m_nnz containing the data for M
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- q - a vector of size variables
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- lb - a vector of size variables containing the lower bounds on x
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- ub - a vector of size variables containing the upper bounds on x
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*/
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btAlignedObjectArray<double> values;
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btAlignedObjectArray<int> rowIndices;
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btAlignedObjectArray<int> colIndices;
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for (int i = 0; i < A.rows(); i++)
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{
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for (int j = 0; j < A.cols(); j++)
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{
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if (A(i, j) != 0.f)
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{
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//add 1, because Path starts at 1, instead of 0
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rowIndices.push_back(i + 1);
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colIndices.push_back(j + 1);
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values.push_back(A(i, j));
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}
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}
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}
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int numNonZero = rowIndices.size();
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btAlignedObjectArray<double> zResult;
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zResult.resize(numVariables);
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btAlignedObjectArray<double> rhs;
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btAlignedObjectArray<double> upperBounds;
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btAlignedObjectArray<double> lowerBounds;
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for (int i = 0; i < numVariables; i++)
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{
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upperBounds.push_back(hi[i]);
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lowerBounds.push_back(lo[i]);
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rhs.push_back(-b[i]);
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}
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SimpleLCP(numVariables, numNonZero, &rowIndices[0], &colIndices[0], &values[0], &rhs[0], &lowerBounds[0], &upperBounds[0], &status, &zResult[0]);
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if (status != MCP_Solved)
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{
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static const char *gReturnMsgs[] = {
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"Invalid return",
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"MCP_Solved: The problem was solved",
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"MCP_NoProgress: A stationary point was found",
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"MCP_MajorIterationLimit: Major iteration limit met",
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"MCP_MinorIterationLimit: Cumulative minor iteration limit met",
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"MCP_TimeLimit: Ran out of time",
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"MCP_UserInterrupt: Control-C, typically",
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"MCP_BoundError: Problem has a bound error",
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"MCP_DomainError: Could not find starting point",
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"MCP_Infeasible: Problem has no solution",
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"MCP_Error: An error occurred within the code",
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"MCP_LicenseError: License could not be found",
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"MCP_OK"};
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printf("ERROR: The PATH MCP solver failed: %s\n", gReturnMsgs[(unsigned int)status]); // << std::endl;
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printf("using Projected Gauss Seidel fallback\n");
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return false;
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}
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else
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{
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for (int i = 0; i < numVariables; i++)
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{
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x[i] = zResult[i];
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//check for #NAN
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if (x[i] != zResult[i])
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return false;
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}
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return true;
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}
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}
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};
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#endif //BT_USE_PATH
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#endif //BT_PATH_SOLVER_H
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