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Documentation                       Search   cube_map_builder.cpp Go to the documentation of this file. /* Copyright, 2000-2002 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/cube_map_builder.h" #include "3d/texture_cube.h" #include "3d/texture_mem.h" #include "nel/misc/vector.h" #include "nel/misc/rgba.h" namespace NL3D { // utility function : build a side of a cube map static uint8 *BuildCubeMapTex(const NLMISC::CVector &start, const NLMISC::CVector &uDir, const NLMISC::CVector &vDir, uint size, ICubeMapFunctor &f ) { NLMISC::CRGBA *map = new NLMISC::CRGBA[size * size]; NLMISC::CRGBA *destTexel = map; NLMISC::CVector currN = start; NLMISC::CVector uStep = (2.f / size) * uDir; NLMISC::CVector vStep = (2.f / size) * vDir; for (uint y = 0; y < size; ++y) { NLMISC::CVector hCurrN = currN; for (uint x = 0; x < size; ++x) { destTexel[x + y *size] = f(hCurrN.normed()); hCurrN += uStep; } currN += vStep; } return (uint8 *) map; } // utility function : build a side of a cube map, with luminance only static uint8 *BuildCubeMapTexLuminance(const NLMISC::CVector &start, const NLMISC::CVector &uDir, const NLMISC::CVector &vDir, uint size, ICubeMapFunctor &f ) { uint8 *map = new uint8[size * size]; uint8 *destTexel = map; NLMISC::CVector currN = start; NLMISC::CVector uStep = (2.f / size) * uDir; NLMISC::CVector vStep = (2.f / size) * vDir; for (uint y = 0; y < size; ++y) { NLMISC::CVector hCurrN = currN; for (uint x = 0; x < size; ++x) { destTexel[x + y *size] = f(hCurrN.normed()).A; hCurrN += uStep; } currN += vStep; } return map; } CTextureCube *BuildCubeMap(sint mapSize, ICubeMapFunctor &f, bool luminanceOnly /* = false*/, const std::string &shareName /* = "" */) { std::auto_ptr<CTextureCube> cubeMap(new CTextureCube); std::auto_ptr<CTextureMem> faces[6]; static const NLMISC::CVector start[] = { NLMISC::CVector(1, 1, 1), NLMISC::CVector(-1, 1, -1), NLMISC::CVector(-1, 1, -1), NLMISC::CVector(-1, -1, 1), NLMISC::CVector(-1, 1, 1), NLMISC::CVector(1, 1, -1) }; static const NLMISC::CVector uDir[] = { - NLMISC::CVector::K, NLMISC::CVector::K, NLMISC::CVector::I, NLMISC::CVector::I, NLMISC::CVector::I, -NLMISC::CVector::I, }; static const NLMISC::CVector vDir[] = { - NLMISC::CVector::J, - NLMISC::CVector::J, NLMISC::CVector::K, - NLMISC::CVector::K, - NLMISC::CVector::J, - NLMISC::CVector::J, }; uint k; for (k = 0; k < 6; ++k) { faces[k].reset(new CTextureMem); uint8 *map = luminanceOnly ? BuildCubeMapTexLuminance(start[k], uDir[k], vDir[k], mapSize, f) : BuildCubeMapTex(start[k], uDir[k], vDir[k], mapSize, f); faces[k]->setPointer(map, mapSize * mapSize * sizeof(uint8) * (luminanceOnly ? 1 : 4), true, false, mapSize, mapSize, luminanceOnly ? CBitmap::Luminance : CBitmap::RGBA ); if (!shareName.empty()) { faces[k]->setShareName(shareName + (char) ('0' + k)); } } static const CTextureCube::TFace toTC[] = { CTextureCube::positive_x, CTextureCube::negative_x, CTextureCube::positive_z, CTextureCube::negative_z, CTextureCube::negative_y, CTextureCube::positive_y }; for (k = 0; k < 6; ++k) { cubeMap->setTexture(toTC[k], faces[k].release()); } cubeMap->setNoFlip(); // keep faces texture as it return cubeMap.release(); } } // NL3D