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#pragma once
#include <array>
#include <unordered_map>
#include <boost/range/adaptor/map.hpp>
#include <boost/functional/hash.hpp>
class Minefield
{
public:
static const int size = 24;
struct WorldCoordTag;
struct OuterChunkCoordTag;
struct InnerChunkCoordTag;
template<typename Tag>
class Coord;
typedef Coord<WorldCoordTag> WorldCoord;
typedef Coord<OuterChunkCoordTag> OuterChunkCoord;
typedef Coord<InnerChunkCoordTag> InnerChunkCoord;
template<typename Tag>
class Coord {
public:
int x, y, z;
Coord()
: x(0), y(0), z(0) { }
Coord(int _x, int _y, int _z)
: x(_x), y(_y), z(_z) {
}
void operator+= (Coord const& other) {
x += other.x;
y += other.y;
z += other.z;
}
};
static OuterChunkCoord convertToOuter (WorldCoord const& wc) {
auto convertOne = [] (const int p) -> int {
if (p < 0)
return (p+1) / size - 1;
else
return p / size;
};
return OuterChunkCoord(convertOne(wc.x), convertOne(wc.y), convertOne(wc.z));
}
static InnerChunkCoord convertToInner (WorldCoord const& wc) {
auto convertOne = [] (const int p) -> int {
if (p<0)
return (p % size + size) % size;
else
return p % size;
};
return InnerChunkCoord(convertOne(wc.x), convertOne(wc.y), convertOne(wc.z));
}
static WorldCoord convertToWorld (InnerChunkCoord const& ic, OuterChunkCoord const& oc) {
auto convertOne = [] (const int i, const int o) -> int {
return i + o * size;
};
return WorldCoord(convertOne(ic.x,oc.x), convertOne(ic.y, oc.y), convertOne(ic.z, oc.z));
}
struct BlockType {
unsigned value;
// TEMP - only the facing direction
unsigned char orientation;
std::array<bool, 6> neighbors;
BlockType(unsigned _value = 0, unsigned char _orientation = 0)
: value(_value), orientation(_orientation) { /*default all are visible*/ for (auto& n : neighbors) n = false; }
};
class Chunk {
std::array<BlockType, size*size*size> data;
void _generate(int cx, int cy, int cz);
void _generateCache();
BlockType& _access (int x, int y, int z) { return data[x + y * size + z * size * size]; };
BlockType const& _access (int x, int y, int z) const { return data[x + y * size + z * size * size]; };
public:
enum Neighbor {
Front = 0, Right = 1, Back = 2, Left = 3, Top = 4, Bottom = 5
};
void set (InnerChunkCoord const& c, unsigned bvalue) {
_access(c.x, c.y, c.z) = bvalue;
// notify the neighbors
if (c.x > 0) _access(c.x-1, c.y, c.z).neighbors[Neighbor::Right] = (bvalue != 0);
if (c.x < size-1) _access(c.x+1, c.y, c.z).neighbors[Neighbor::Left] = (bvalue != 0);
if (c.y > 0) _access(c.x, c.y-1, c.z).neighbors[Neighbor::Top] = (bvalue != 0);
if (c.y < size-1) _access(c.x, c.y+1, c.z).neighbors[Neighbor::Bottom] = (bvalue != 0);
if (c.z > 0) _access(c.x, c.y, c.z-1).neighbors[Neighbor::Front] = (bvalue != 0);
if (c.z < size-1) _access(c.x, c.y, c.z+1).neighbors[Neighbor::Back] = (bvalue!= 0);
}
BlockType const& get (InnerChunkCoord const& c) const {
return _access(c.x, c.y, c.z);
}
Chunk () { }
Chunk (OuterChunkCoord const& ccoords);
friend class Minefield;
};
class CoordHash {
template<typename Tag>
std::size_t operator()(Coord<Tag> const& p)
{
std::size_t seed = 0;
boost::hash_combine(seed, p.x);
boost::hash_combine(seed, p.y);
boost::hash_combine(seed, p.z);
return seed;
}
};
private:
static OuterChunkCoord _getChunkCoordinates (int x, int y, int z);
static int _innerChunkCoordFromOuterChunkCoord (int p);
std::unordered_map<OuterChunkCoord, Chunk, CoordHash> data;
public:
unsigned getSize () const { return size; }
BlockType const& get(int x, int y, int z);
BlockType const& get(WorldCoord const& coord);
void set(int x, int y, int z, unsigned value);
/*auto getChunks () -> decltype(data | boost::adaptors::map_values) {
return data | boost::adaptors::map_values;
}*/
auto getChunks () -> decltype(data) {
return data;
}
void loadFromFile(std::string const& path);
void saveToFile(std::string const& path) const;
Minefield();
};
template<typename Tag>
bool operator<(Minefield::Coord<Tag> const& a, Minefield::Coord<Tag> const& b) {
if (a.x != b.x)
return a.x < b.x;
else if (a.y != b.y)
return a.y < b.y;
else
return a.z < b.z;
}
template<typename Tag>
bool operator==(Minefield::Coord<Tag> const& a, Minefield::Coord<Tag> const& b) {
return (a.x==b.x && a.y==b.y && a.z==b.z);
}
template<typename Tag>
Minefield::Coord<Tag> operator+ (Minefield::Coord<Tag> const& a, Minefield::Coord<Tag> const& b) {
Minefield::Coord<Tag> temp (a);
temp += b;
return temp;
}