2012-08-06 23:34:41 +02:00
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/* Copyright (C) 2012 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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2012-08-06 21:10:47 +02:00
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#ifndef INCLUDED_MIKKWRAP
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#define INCLUDED_MIKKWRAP
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2012-08-21 18:40:07 +02:00
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#include "graphics/mikktspace.h"
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// Disable useless MSVC warning
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#if MSC_VERSION
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# pragma warning(disable:4512) // "assignment operator could not be generated"
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#endif
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2012-08-06 21:10:47 +02:00
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class MikkTSpace
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{
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public:
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MikkTSpace(const CModelDefPtr& m, std::vector<float>& v);
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void generate();
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private:
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SMikkTSpaceInterface interface;
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SMikkTSpaceContext context;
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const CModelDefPtr& model;
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std::vector<float>& newVertices;
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// Returns the number of faces (triangles/quads) on the mesh to be processed.
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static int getNumFaces(const SMikkTSpaceContext *pContext);
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// Returns the number of vertices on face number iFace
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// iFace is a number in the range {0, 1, ..., getNumFaces()-1}
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static int getNumVerticesOfFace(const SMikkTSpaceContext *pContext, const int iFace);
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// returns the position/normal/texcoord of the referenced face of vertex number iVert.
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// iVert is in the range {0,1,2} for triangles and {0,1,2,3} for quads.
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static void getPosition(const SMikkTSpaceContext *pContext,
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float fvPosOut[], const int iFace, const int iVert);
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static void getNormal(const SMikkTSpaceContext *pContext,
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float fvNormOut[], const int iFace, const int iVert);
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static void getTexCoord(const SMikkTSpaceContext *pContext,
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float fvTexcOut[], const int iFace, const int iVert);
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// either (or both) of the two setTSpace callbacks can be set.
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// The call-back m_setTSpaceBasic() is sufficient for basic normal mapping.
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// This function is used to return the tangent and fSign to the application.
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// fvTangent is a unit length vector.
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// For normal maps it is sufficient to use the following simplified version of the bitangent which is generated at pixel/vertex level.
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// bitangent = fSign * cross(vN, tangent);
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// Note that the results are returned unindexed. It is possible to generate a new index list
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// But averaging/overwriting tangent spaces by using an already existing index list WILL produce INCRORRECT results.
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// DO NOT! use an already existing index list.
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//void setTSpaceBasic(const MikkTSpace *parent, const SMikkTSpaceContext *pContext,
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// const float fvTangent[], const float fSign, const int iFace, const int iVert);
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// This function is used to return tangent space results to the application.
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// fvTangent and fvBiTangent are unit length vectors and fMagS and fMagT are their
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// true magnitudes which can be used for relief mapping effects.
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// fvBiTangent is the "real" bitangent and thus may not be perpendicular to fvTangent.
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// However, both are perpendicular to the vertex normal.
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// For normal maps it is sufficient to use the following simplified version of the bitangent which is generated at pixel/vertex level.
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// fSign = bIsOrientationPreserving ? 1.0f : (-1.0f);
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// bitangent = fSign * cross(vN, tangent);
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// Note that the results are returned unindexed. It is possible to generate a new index list
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// But averaging/overwriting tangent spaces by using an already existing index list WILL produce INCRORRECT results.
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// DO NOT! use an already existing index list.
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static void setTSpace(const SMikkTSpaceContext * pContext, const float fvTangent[],
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const float fvBiTangent[], const float fMagS, const float fMagT,
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const tbool bIsOrientationPreserving, const int iFace, const int iVert);
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};
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#endif // INCLUDED_MIKKWRAP
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