space.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.

 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef STARTREK_SPACE_H
#define STARTREK_SPACE_H

#include "fixedint.h"

namespace StarTrek {

template<typename T>
struct TPoint {
    T x;
    T y;
    T z;

    TPoint() : x(0), y(0), z(0) {}
    TPoint(T _x, T _y, T _z) : x(_x), y(_y), z(_z) {}

    int32 getDiagonal() {
        return (int32)sqrt((double)x * x + y * y + z * z);
    }

    TPoint<T> operator+(const TPoint<T> &p) const {
        TPoint<T> p2;
        p2.x = x + p.x;
        p2.y = y + p.y;
        p2.z = z + p.z;
        return p2;
    }
    TPoint<T> operator-(const TPoint<T> &p) const {
        TPoint<T> p2;
        p2.x = x - p.x;
        p2.y = y - p.y;
        p2.z = z - p.z;
        return p2;
    }
    void operator+=(const TPoint &p) {
        x += p.x;
        y += p.y;
        z += p.z;
    }
    void operator-=(const TPoint &p) {
        x -= p.x;
        y -= p.y;
        z -= p.z;
    }
    T &operator[](int i) {
        if (i == 0)
            return x;
        else if (i == 1)
            return y;
        else if (i == 2)
            return z;

        // Unknown Out of Range
        assert(false);
        return x;
    }
    T operator[](int i) const {
        if (i == 0)
            return x;
        else if (i == 1)
            return y;
        else if (i == 2)
            return z;

        // Unknown Out of Range
        assert(false);
        return x;
    }
};

typedef TPoint<int32> Point3;
typedef TPoint<int16> Point3_Short;
typedef TPoint<Fixed14> Point_Fixed14;


template<typename T>
struct TMatrix {
private:
    T m[3];

public:
    TMatrix() {
        for (int i = 0; i < 3; i++)
            for (int j = 0; j < 3; j++)
                m[i][j] = 0;
    }
    T &operator[](int i) {
        return m[i];
    };
    T operator[](int i) const {
        return m[i];
    };

    TMatrix operator*(const TMatrix &m2) const {
        TMatrix ret;
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                ret[i][j] = 0;
                for (int a = 0; a < 3; a++)
                    ret[i][j] += m[i][a] * m2[a][j];
            }
        }
        return ret;
    }

    void operator*=(const TMatrix &m2) {
        *this = *this * m2;
    }

    TMatrix<T> invert() const {
        TMatrix<T> ret;
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                ret[i][j] = m[j][i];
            }
        }
        return ret;
    }
};

typedef TMatrix<Point_Fixed14> Matrix;

struct Star {
    bool active;
    Point3 pos;
};

// Struct for objects in space.
// TODO: what does this stand for? Maybe rename it.
struct R3 {
    Point3 pos; // 0x0
    Matrix matrix; // 0xc
    int16 field1e; // 0x1e
    int16 field20; // 0x20
    int16 field22; // 0x22
    int16 field24; // 0x24
    Point3_Short speed; // 0x26
    int32 funcPtr1; // 0x2c
    int32 funcPtr2; // 0x30
    int16 field34; // 0x34
    Point3 field36; // 0x36
    Matrix matrix2; // 0x42
    int32 field54; // 0x54 (used for sorting by draw priority?)
    int16 field58; // 0x58
    int16 field5a; // 0x5a
    Bitmap *bitmap; // 0x68 (was: shpFile)
    // 0x6a (was: bitmapOffset)
    double field80; // 0x80
    double field88; // 0x88
    double field90; // 0x90
    double field98; // 0x98
};

// Maximum number of stars visible at once in the starfields
#define NUM_STARS 16

// Maximum number of R3 objects in space at once
#define NUM_SPACE_OBJECTS 0x30

} // End of namespace StarTrek

#endif