59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
#include <osgUtil/CubeMapGenerator>
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#include <memory>
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#include <cstdlib>
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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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osg::ref_ptr<osg::Image> image = osgNew osg::Image;
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std::auto_ptr<unsigned char> data(static_cast<unsigned char *>(std::malloc(texture_size*texture_size*4)));
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image->setImage(texture_size, texture_size, 1, 4, GL_RGBA, GL_UNSIGNED_BYTE, data.get());
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data.release();
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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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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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const float duv = 2.0f/(texture_size_-1);
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float v = 1;
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for (int i=0; i<texture_size_; ++i) {
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float u = 1;
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for (int j=0; j<texture_size_; ++j) {
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if (use_osg_system) {
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set_pixel(0, j, i, compute_color(osg::Vec3(1, -u, v)));
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set_pixel(1, j, i, compute_color(osg::Vec3(-1, u, v)));
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set_pixel(2, j, i, compute_color(osg::Vec3(-u, v, 1)));
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set_pixel(3, j, i, compute_color(osg::Vec3(-u, -v, -1)));
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set_pixel(4, j, i, compute_color(osg::Vec3(-u, -1, v)));
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set_pixel(5, j, i, compute_color(osg::Vec3(u, 1, v)));
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} else {
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set_pixel(0, j, i, compute_color(osg::Vec3(1, v, -u)));
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set_pixel(1, j, i, compute_color(osg::Vec3(-1, v, u)));
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set_pixel(2, j, i, compute_color(osg::Vec3(-u, 1, v)));
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set_pixel(3, j, i, compute_color(osg::Vec3(-u, -1, -v)));
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set_pixel(4, j, i, compute_color(osg::Vec3(-u, v, -1)));
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set_pixel(5, j, i, compute_color(osg::Vec3(u, v, 1)));
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}
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u -= duv;
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}
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v -= duv;
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}
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}
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