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/* Copyright (C) 2012 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. 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 of the License, or
* (at your option) any later version.
*
* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INCLUDED_MIKKWRAP
#define INCLUDED_MIKKWRAP
#include "third_party/mikktspace/mikktspace.h"
class MikkTSpace
{
public:
MikkTSpace(const CModelDefPtr& m, std::vector<float>& v, bool gpuSkinning);
void generate();
private:
SMikkTSpaceInterface m_Interface;
SMikkTSpaceContext m_Context;
const CModelDefPtr& m_Model;
std::vector<float>& m_NewVertices;
bool m_GpuSkinning;
// Returns the number of faces (triangles/quads) on the mesh to be processed.
static int getNumFaces(const SMikkTSpaceContext *pContext);
// Returns the number of vertices on face number iFace
// iFace is a number in the range {0, 1, ..., getNumFaces()-1}
static int getNumVerticesOfFace(const SMikkTSpaceContext *pContext, const int iFace);
// returns the position/normal/texcoord of the referenced face of vertex number iVert.
// iVert is in the range {0,1,2} for triangles and {0,1,2,3} for quads.
static void getPosition(const SMikkTSpaceContext *pContext,
float fvPosOut[], const int iFace, const int iVert);
static void getNormal(const SMikkTSpaceContext *pContext,
float fvNormOut[], const int iFace, const int iVert);
static void getTexCoord(const SMikkTSpaceContext *pContext,
float fvTexcOut[], const int iFace, const int iVert);
// This function is used to return tangent space results to the application.
// fvTangent and fvBiTangent are unit length vectors and fMagS and fMagT are their
// true magnitudes which can be used for relief mapping effects.
// fvBiTangent is the "real" bitangent and thus may not be perpendicular to fvTangent.
// However, both are perpendicular to the vertex normal.
// For normal maps it is sufficient to use the following simplified version of the bitangent which is generated at pixel/vertex level.
// fSign = bIsOrientationPreserving ? 1.0f : (-1.0f);
// bitangent = fSign * cross(vN, tangent);
static void setTSpace(const SMikkTSpaceContext * pContext, const float fvTangent[],
const float fvBiTangent[], const float fMagS, const float fMagT,
const tbool bIsOrientationPreserving, const int iFace, const int iVert);
};
#endif // INCLUDED_MIKKWRAP
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