src/sandbox.hpp


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#pragma once

#include "pcg.hpp"

#include <cstdint>
#include <vector>

const int MBIT_DISPLACABLE = 1;

struct Tile {
    enum Solid : unsigned char {
        AIR = 0,
        ROCK,
        SAND,
    };

    enum Fluid : unsigned char {
        NOTHING = 0,
        WATER,
    };

    Solid so = {};
    Fluid fl = {};
    uint8_t fmass = 0;
    bool updated = false;

    uint32_t get_color() const;
};

struct Sandbox {
    std::vector<uint32_t> _bitmap;
    std::vector<Tile> _a;
    Pcg32 _pcg;
    Tile _wall_tile;
    int width, height;
    int _x, _y;
    int ncycle = 0;

    Sandbox(int w, int h);

    void simulate_step();

    Tile& gs(int x, int y);
    void set_sand(int x, int y, Tile sand);
    void shift_sand(int x, int y);

    // std::vector<uint32_t> to_bitmap() const;
};