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211 lines
6.1 KiB
C++
211 lines
6.1 KiB
C++
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "std3d.h"
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#include "nel/3d/patchuv_locator.h"
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using namespace std;
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using namespace NLMISC;
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namespace NL3D
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{
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// ***************************************************************************
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void CPatchUVLocator::build(const CPatch *patchCenter, sint edgeCenter, CPatch::CBindInfo &bindInfo)
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{
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nlassert(bindInfo.Zone);
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// copy basic. NB: NPatchs==0 means patchCenter is binded on a 1/X patch.
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_CenterPatch= const_cast<CPatch*>(patchCenter);
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_CenterPatchEdge= edgeCenter;
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_NPatchs= bindInfo.NPatchs;
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// set it to true. false-d if one of the neighbor patch does not have same number of tile.
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_SameEdgeOrder= true;
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// For all patchs binded to me.
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for(sint i=0; i<_NPatchs; i++)
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{
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// The edge of the neihbor on which we are binded.
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sint edgeNeighbor= bindInfo.Edge[i];
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CPatch *paNeighbor= bindInfo.Next[i];
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_NeighborPatch[i]= paNeighbor;
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// Find uvI, uvJ, uvP such that:
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// uvOut= uvIn.x * uvI + uvIn.y * uvJ + uvP.
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CVector2f &uvI= _NeighborBasis[i].UvI;
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CVector2f &uvJ= _NeighborBasis[i].UvJ;
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CVector2f &uvP= _NeighborBasis[i].UvP;
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// Find the basis MeToNeighbor.
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//=============================
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sint rotation= (edgeCenter - edgeNeighbor + 4) & 3;
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// Find scale to apply.
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float scX, scY;
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// If our neighbor edge is a vertical edge
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if( (edgeNeighbor&1)==0 )
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{
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scX= 1;
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// Manage difference of Order at the edge.
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scY= (float)paNeighbor->getOrderForEdge(edgeNeighbor) / (float)patchCenter->getOrderForEdge(edgeCenter);
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// Manage bind on the edge.
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// If patchCenter is binded on a bigger
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if(bindInfo.MultipleBindNum!=0)
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scY/= bindInfo.MultipleBindNum;
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if(_NPatchs>1)
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scY*= _NPatchs;
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// same TileOrder on the edge??
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if(scY!=1)
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_SameEdgeOrder= false;
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}
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else
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{
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scY= 1;
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// Manage difference of Order at the edge.
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scX= (float)paNeighbor->getOrderForEdge(edgeNeighbor) / (float)patchCenter->getOrderForEdge(edgeCenter);
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// Manage bind on the edge.
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// If patchCenter is binded on a bigger
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if(bindInfo.MultipleBindNum!=0)
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scX/= bindInfo.MultipleBindNum;
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if(_NPatchs>1)
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scX*= _NPatchs;
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// same TileOrder on the edge??
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if(scX!=1)
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_SameEdgeOrder= false;
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}
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// Find rotation to apply.
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switch(rotation)
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{
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case 0: uvI.set(-scX, 0); uvJ.set(0, -scY); break;
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case 1: uvI.set(0, -scY); uvJ.set(scX, 0); break;
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case 2: uvI.set(scX, 0); uvJ.set(0, scY); break;
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case 3: uvI.set(0, scY); uvJ.set(-scX, 0); break;
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}
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// Find the position.
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//=============================
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// Find the uv coord at start of the edge, for 2 patchs.
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CVector2f uvCenter(0.f, 0.f);
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CVector2f uvNeighbor(0.f, 0.f);
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float decal;
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// find the uv at start of edgeCenter, + decal due to bind 1/X.
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float ocS= patchCenter->getOrderS();
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float ocT= patchCenter->getOrderT();
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// Manage Bind 1/X.
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if(_NPatchs>1)
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{
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// Move uvCenter, so it is near the position at start of edgeNeighbor.
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decal= (float)i / _NPatchs;
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}
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else
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decal= 0;
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// Manage rotation.
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switch(edgeCenter)
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{
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case 0: uvCenter.set(0, decal*ocT); break;
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case 1: uvCenter.set(decal*ocS, ocT); break;
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case 2: uvCenter.set(ocS, (1-decal)*ocT); break;
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case 3: uvCenter.set((1-decal)*ocS, 0); break;
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};
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// find the uv at start of edgeNeighbor, + decal due to bind X/1.
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float onS= paNeighbor->getOrderS();
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float onT= paNeighbor->getOrderT();
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// Manage Bind X/1.
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if(bindInfo.MultipleBindNum!=0)
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{
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// Must invert the id, because of mirror.... (make a draw).
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sint id= (bindInfo.MultipleBindNum-1) - bindInfo.MultipleBindId;
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// Move uvNeighbor, so it is near the position at start of edgeCenter.
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decal= (float)id / bindInfo.MultipleBindNum;
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}
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else
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decal= 0;
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// Manage rotation.
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switch(edgeNeighbor)
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{
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case 0: uvNeighbor.set(0, (1-decal)*onT); break;
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case 1: uvNeighbor.set((1-decal)*onS, onT); break;
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case 2: uvNeighbor.set(onS, decal*onT); break;
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case 3: uvNeighbor.set(decal*onS, 0); break;
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};
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// uvOut= uvIn.x * uvI + uvIn.y * uvJ + uvP.
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// So uvP = uvOut - uvIn.x * uvI - uvIn.y * uvJ
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uvP= uvNeighbor - uvCenter.x * uvI - uvCenter.y * uvJ;
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}
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}
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// ***************************************************************************
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uint CPatchUVLocator::selectPatch(const CVector2f &uvIn)
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{
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if(_NPatchs==1)
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return 0;
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else
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{
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// Choice before on which patch we must go.
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float selection=0.0;
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uint os= _CenterPatch->getOrderS();
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uint ot= _CenterPatch->getOrderT();
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switch(_CenterPatchEdge)
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{
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case 0: selection= uvIn.y / ot; break;
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case 1: selection= uvIn.x / os; break;
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case 2: selection= (ot-uvIn.y) / ot; break;
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case 3: selection= (os-uvIn.x) / os; break;
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}
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sint sel= (sint)floor(selection*_NPatchs);
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clamp(sel, 0, _NPatchs-1);
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return sel;
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}
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}
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// ***************************************************************************
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void CPatchUVLocator::locateUV(const CVector2f &uvIn, uint patch, CPatch *&patchOut, CVector2f &uvOut)
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{
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if(_NPatchs==1)
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{
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// Change basis and select good patch.
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_NeighborBasis[0].mulPoint(uvIn, uvOut);
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patchOut= _NeighborPatch[0];
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}
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else
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{
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// Change basis and select good patch.
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_NeighborBasis[patch].mulPoint(uvIn, uvOut);
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patchOut= _NeighborPatch[patch];
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}
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}
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} // NL3D
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