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162 lines
3.0 KiB
C++
162 lines
3.0 KiB
C++
/*
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* \brief Vertex array
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* \author Norman Feske
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* \date 2010-09-27
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*/
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/*
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* Copyright (C) 2010-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__NANO3D__VERTEX_ARRAY_H_
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#define _INCLUDE__NANO3D__VERTEX_ARRAY_H_
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#include <nano3d/sincos_frac16.h>
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namespace Nano3d {
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template <typename> class Vec2;
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template <typename> class Vec3;
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using Vertex = Vec3<int>;
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template <unsigned> class Vertex_array;
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}
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template <typename T>
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class Nano3d::Vec2
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{
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private:
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T _x, _y;
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public:
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Vec2() : _x(0), _y(0) { }
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Vec2(T x, T y) : _x(x), _y(y) { }
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T &x() { return _x; }
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T &y() { return _y; }
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T x() const { return _x; }
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T y() const { return _y; }
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void rotate(int sina, int cosa)
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{
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int x = _x*cosa - _y*sina;
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int y = _x*sina + _y*cosa;
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_x = x >> 16;
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_y = y >> 16;
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}
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};
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template <typename T>
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class Nano3d::Vec3
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{
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private:
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T _x, _y, _z;
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public:
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Vec3() : _x(0), _y(0), _z(0) { }
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Vec3(T x, T y, T z) : _x(x), _y(y), _z(z) { }
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T &x() { return _x; }
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T &y() { return _y; }
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T &z() { return _z; }
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T x() const { return _x; }
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T y() const { return _y; }
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T z() const { return _z; }
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};
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template <unsigned MAX_VERTICES>
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class Nano3d::Vertex_array
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{
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protected:
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Vertex _buf[MAX_VERTICES];
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void _rotate(int & (Vec3<int>::*x)(), int & (Vec3<int>::*y)(), int angle)
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{
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int sina = sin_frac16(angle);
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int cosa = cos_frac16(angle);
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Vertex *vertex = &_buf[0];
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for (unsigned i = 0; i < MAX_VERTICES; i++, vertex++) {
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Vec2<int> p((vertex->*x)(), (vertex->*y)());
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p.rotate(sina, cosa);
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(vertex->*x)() = p.x();
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(vertex->*y)() = p.y();
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}
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}
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public:
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/**
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* Constructor
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*/
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Vertex_array() { }
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Vertex &operator [] (unsigned index) { return _buf[index]; }
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/**
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* Rotate vertices around x, y, and z axis
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*/
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void rotate_x(int angle) { _rotate(&Vertex::y, &Vertex::z, angle); }
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void rotate_y(int angle) { _rotate(&Vertex::x, &Vertex::z, angle); }
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void rotate_z(int angle) { _rotate(&Vertex::x, &Vertex::y, angle); }
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/**
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* Apply central projection to vertices
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*
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* FIXME: Add proper documentation of the parameters.
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*
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* \param z_shift Recommended value is 1600
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* \param distance Recommended value is screen height
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*/
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void project(int z_shift, int distance)
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{
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Vertex *vertex = &_buf[0];
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for (unsigned i = 0; i < MAX_VERTICES; i++, vertex++) {
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int z = (vertex->z() >> 5) + z_shift - 1;
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/* avoid division by zero */
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if (z == 0) z += 1;
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vertex->x() = ((vertex->x() >> 5) * distance) / z;
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vertex->y() = ((vertex->y() >> 5) * distance) / z;
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}
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}
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/**
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* Translate vertices
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*/
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void translate(int dx, int dy, int dz)
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{
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Vertex *vertex = &_buf[0];
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for (unsigned i = 0; i < MAX_VERTICES; i++, vertex++) {
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vertex->x() += dx;
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vertex->y() += dy;
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vertex->z() += dz;
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}
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}
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};
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#endif /* _INCLUDE__NANO3D__VERTEX_ARRAY_H_ */
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