Home

nevrax.com

Nevrax.org News Mailing-list Documentation CVS Bugs License

Documentation                       Search   patchuv_locator.cpp Go to the documentation of this file. /* Copyright, 2001 Nevrax Ltd. * * This file is part of NEVRAX NEL. * NEVRAX NEL is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * NEVRAX NEL is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * You should have received a copy of the GNU General Public License * along with NEVRAX NEL; see the file COPYING. If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */ #include "std3d.h" #include "3d/patchuv_locator.h" using namespace std; using namespace NLMISC; namespace NL3D { // *************************************************************************** void CPatchUVLocator::build(const CPatch *patchCenter, sint edgeCenter, CPatch::CBindInfo &bindInfo) { nlassert(bindInfo.Zone); // copy basic. NB: NPatchs==0 means patchCenter is binded on a 1/X patch. _CenterPatch= const_cast<CPatch*>(patchCenter); _CenterPatchEdge= edgeCenter; _NPatchs= bindInfo.NPatchs; // set it to true. false-d if one of the neighbor patch does not have same number of tile. _SameEdgeOrder= true; // For all patchs binded to me. for(sint i=0; i<_NPatchs; i++) { // The edge of the neihbor on which we are binded. sint edgeNeighbor= bindInfo.Edge[i]; CPatch *paNeighbor= bindInfo.Next[i]; _NeighborPatch[i]= paNeighbor; // Find uvI, uvJ, uvP such that: // uvOut= uvIn.x * uvI + uvIn.y * uvJ + uvP. CVector2f &uvI= _NeighborBasis[i].UvI; CVector2f &uvJ= _NeighborBasis[i].UvJ; CVector2f &uvP= _NeighborBasis[i].UvP; // Find the basis MeToNeighbor. //============================= sint rotation= (edgeCenter - edgeNeighbor + 4) & 3; // Find scale to apply. float scX, scY; // If our neighbor edge is a vertical edge if( (edgeNeighbor&1)==0 ) { scX= 1; // Manage difference of Order at the edge. scY= (float)paNeighbor->getOrderForEdge(edgeNeighbor) / (float)patchCenter->getOrderForEdge(edgeCenter); // Manage bind on the edge. // If patchCenter is binded on a bigger if(bindInfo.MultipleBindNum!=0) scY/= bindInfo.MultipleBindNum; if(_NPatchs>1) scY*= _NPatchs; // same TileOrder on the edge?? if(scY!=1) _SameEdgeOrder= false; } else { scY= 1; // Manage difference of Order at the edge. scX= (float)paNeighbor->getOrderForEdge(edgeNeighbor) / (float)patchCenter->getOrderForEdge(edgeCenter); // Manage bind on the edge. // If patchCenter is binded on a bigger if(bindInfo.MultipleBindNum!=0) scX/= bindInfo.MultipleBindNum; if(_NPatchs>1) scX*= _NPatchs; // same TileOrder on the edge?? if(scX!=1) _SameEdgeOrder= false; } // Find rotation to apply. switch(rotation) { case 0: uvI.set(-scX, 0); uvJ.set(0, -scY); break; case 1: uvI.set(0, -scY); uvJ.set(scX, 0); break; case 2: uvI.set(scX, 0); uvJ.set(0, scY); break; case 3: uvI.set(0, scY); uvJ.set(-scX, 0); break; } // Find the position. //============================= // Find the uv coord at start of the edge, for 2 patchs. CVector2f uvCenter; CVector2f uvNeighbor; float decal; // find the uv at start of edgeCenter, + decal due to bind 1/X. float ocS= patchCenter->getOrderS(); float ocT= patchCenter->getOrderT(); // Manage Bind 1/X. if(_NPatchs>1) { // Move uvCenter, so it is near the position at start of edgeNeighbor. decal= (float)i / _NPatchs; } else decal= 0; // Manage rotation. switch(edgeCenter) { case 0: uvCenter.set(0, decal*ocT); break; case 1: uvCenter.set(decal*ocS, ocT); break; case 2: uvCenter.set(ocS, (1-decal)*ocT); break; case 3: uvCenter.set((1-decal)*ocS, 0); break; }; // find the uv at start of edgeNeighbor, + decal due to bind X/1. float onS= paNeighbor->getOrderS(); float onT= paNeighbor->getOrderT(); // Manage Bind X/1. if(bindInfo.MultipleBindNum!=0) { // Must invert the id, because of mirror.... (make a draw). sint id= (bindInfo.MultipleBindNum-1) - bindInfo.MultipleBindId; // Move uvNeighbor, so it is near the position at start of edgeCenter. decal= (float)id / bindInfo.MultipleBindNum; } else decal= 0; // Manage rotation. switch(edgeNeighbor) { case 0: uvNeighbor.set(0, (1-decal)*onT); break; case 1: uvNeighbor.set((1-decal)*onS, onT); break; case 2: uvNeighbor.set(onS, decal*onT); break; case 3: uvNeighbor.set(decal*onS, 0); break; }; // uvOut= uvIn.x * uvI + uvIn.y * uvJ + uvP. // So uvP = uvOut - uvIn.x * uvI - uvIn.y * uvJ uvP= uvNeighbor - uvCenter.x * uvI - uvCenter.y * uvJ; } } // *************************************************************************** uint CPatchUVLocator::selectPatch(const CVector2f &uvIn) { if(_NPatchs==1) return 0; else { // Choice before on which patch we must go. float selection=0.0; uint os= _CenterPatch->getOrderS(); uint ot= _CenterPatch->getOrderT(); switch(_CenterPatchEdge) { case 0: selection= uvIn.y / ot; break; case 1: selection= uvIn.x / os; break; case 2: selection= (ot-uvIn.y) / ot; break; case 3: selection= (os-uvIn.x) / os; break; } sint sel= (sint)floor(selection*_NPatchs); clamp(sel, 0, _NPatchs-1); return sel; } } // *************************************************************************** void CPatchUVLocator::locateUV(const CVector2f &uvIn, uint patch, CPatch *&patchOut, CVector2f &uvOut) { if(_NPatchs==1) { // Change basis and select good patch. _NeighborBasis[0].mulPoint(uvIn, uvOut); patchOut= _NeighborPatch[0]; } else { // Change basis and select good patch. _NeighborBasis[patch].mulPoint(uvIn, uvOut); patchOut= _NeighborPatch[patch]; } } } // NL3D