71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library 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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* OpenSceneGraph Public License for more details.
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*/
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#include <osgUtil/CubeMapGenerator>
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#include <stdlib.h>
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#include <osg/Matrix>
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using namespace osgUtil;
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CubeMapGenerator::CubeMapGenerator(int texture_size)
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: osg::Referenced(),
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texture_size_(texture_size)
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{
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for (int i=0; i<6; ++i)
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{
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osg::ref_ptr<osg::Image> image = new osg::Image;
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unsigned char* data = new unsigned char [texture_size*texture_size*4];
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image->setImage(texture_size, texture_size, 1, 4, GL_RGBA, GL_UNSIGNED_BYTE, data, osg::Image::USE_NEW_DELETE);
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images_.push_back(image);
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}
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}
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CubeMapGenerator::CubeMapGenerator(const CubeMapGenerator ©, const osg::CopyOp ©op)
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: osg::Referenced(copy),
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texture_size_(copy.texture_size_)
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{
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Image_list::const_iterator i;
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for (i=copy.images_.begin(); i!=copy.images_.end(); ++i)
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{
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images_.push_back(static_cast<osg::Image *>(copyop(i->get())));
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}
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}
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void CubeMapGenerator::generateMap(bool use_osg_system)
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{
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osg::Matrix M;
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if (use_osg_system) {
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M = osg::Matrix::rotate(osg::PI_2, osg::Vec3(1, 0, 0));
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} else {
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M = osg::Matrix::identity();
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}
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const float dst = 2.0f/(texture_size_-1);
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float t = -1;
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for (int i=0; i<texture_size_; ++i) {
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float s = -1;
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for (int j=0; j<texture_size_; ++j) {
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set_pixel(0, j, i, compute_color(osg::Vec3(1, -t, -s) * M));
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set_pixel(1, j, i, compute_color(osg::Vec3(-1, -t, s) * M));
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set_pixel(2, j, i, compute_color(osg::Vec3(s, 1, t) * M));
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set_pixel(3, j, i, compute_color(osg::Vec3(s, -1, -t) * M));
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set_pixel(4, j, i, compute_color(osg::Vec3(s, -t, 1) * M));
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set_pixel(5, j, i, compute_color(osg::Vec3(-s, -t, -1) * M));
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s += dst;
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}
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t += dst;
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}
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}
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