src/block.hpp

   1 #ifndef BLANK_BLOCK_HPP_
   2 #define BLANK_BLOCK_HPP_
   3
   4 #include "geometry.hpp"
   5 #include "model.hpp"
   6 #include "shape.hpp"
   7
   8 #include <vector>
   9 #include <glm/glm.hpp>
  10
  11
  12 namespace blank {
  13
  14 /// single 1x1x1 cube
  15 struct Block {
  16
  17         using Type = unsigned short;
  18         using Pos = glm::vec3;
  19
  20         enum Face {
  21                 FACE_UP,
  22                 FACE_DOWN,
  23                 FACE_RIGHT,
  24                 FACE_LEFT,
  25                 FACE_FRONT,
  26                 FACE_BACK,
  27                 FACE_COUNT,
  28         };
  29         enum Turn {
  30                 TURN_NONE,
  31                 TURN_LEFT,
  32                 TURN_AROUND,
  33                 TURN_RIGHT,
  34                 TURN_COUNT,
  35         };
  36
  37         Type type;
  38         unsigned char orient;
  39
  40         constexpr explicit Block(Type type = 0, Face face = FACE_UP, Turn turn = TURN_NONE)
  41         : type(type), orient(face * TURN_COUNT + turn) { }
  42
  43         const glm::mat4 &Transform() const;
  44
  45         Face GetFace() const { return Face(orient / TURN_COUNT); }
  46         void SetFace(Face face) { orient = face * TURN_COUNT + GetTurn(); }
  47         Turn GetTurn() const { return Turn(orient % TURN_COUNT); }
  48         void SetTurn(Turn turn) { orient = GetFace() * TURN_COUNT + turn; }
  49
  50         static Face Opposite(Face f) {
  51                 return Face(f ^ 1);
  52         }
  53
  54         static glm::tvec3<int> FaceNormal(Face face) {
  55                 switch (face) {
  56                         case FACE_UP:
  57                                 return { 0, 1, 0 };
  58                         case FACE_DOWN:
  59                                 return { 0, -1, 0 };
  60                         case FACE_RIGHT:
  61                                 return { 1, 0, 0 };
  62                         case FACE_LEFT:
  63                                 return { -1, 0, 0 };
  64                         case FACE_FRONT:
  65                                 return { 0, 0, 1 };
  66                         case FACE_BACK:
  67                                 return { 0, 0, -1 };
  68                         default:
  69                                 return { 0, 0, 0 };
  70                 }
  71         }
  72
  73         static Face NormalFace(const glm::vec3 &norm) {
  74                 const glm::vec3 anorm(abs(norm));
  75                 if (anorm.x > anorm.y) {
  76                         if (anorm.x > anorm.z) {
  77                                 return norm.x > 0.0f ? FACE_RIGHT : FACE_LEFT;
  78                         } else {
  79                                 return norm.z > 0.0f ? FACE_FRONT : FACE_BACK;
  80                         }
  81                 } else {
  82                         if (anorm.y > anorm.z) {
  83                                 return norm.y > 0.0f ? FACE_UP : FACE_DOWN;
  84                         } else {
  85                                 return norm.z > 0.0f ? FACE_FRONT : FACE_BACK;
  86                         }
  87                 }
  88         }
  89
  90 };
  91
  92
  93 /// attributes of a type of block
  94 struct BlockType {
  95
  96         const Shape *shape;
  97         glm::vec3 color;
  98         glm::vec3 outline_color;
  99
 100         Block::Type id;
 101
 102         int luminosity;
 103
 104         bool visible;
 105         bool block_light;
 106
 107         struct Faces {
 108                 bool face[Block::FACE_COUNT];
 109                 Faces &operator =(const Faces &other) {
 110                         for (int i = 0; i < Block::FACE_COUNT; ++i) {
 111                                 face[i] = other.face[i];
 112                         }
 113                         return *this;
 114                 }
 115                 bool operator [](Block::Face f) const {
 116                         return face[f];
 117                 }
 118         } fill;
 119
 120         explicit BlockType(
 121                 bool v = false,
 122                 const glm::vec3 &color = { 1, 1, 1 },
 123                 const Shape *shape = &DEFAULT_SHAPE
 124         );
 125
 126         static const NullShape DEFAULT_SHAPE;
 127
 128         bool FaceFilled(const Block &, Block::Face) const;
 129
 130         void FillModel(
 131                 Model::Buffer &m,
 132                 const glm::mat4 &transform = glm::mat4(1.0f),
 133                 Model::Index idx_offset = 0
 134         ) const;
 135         void FillBlockModel(
 136                 BlockModel::Buffer &m,
 137                 const glm::mat4 &transform = glm::mat4(1.0f),
 138                 BlockModel::Index idx_offset = 0
 139         ) const;
 140         void FillOutlineModel(
 141                 OutlineModel &m,
 142                 const glm::vec3 &pos_offset = { 0, 0, 0 },
 143                 OutlineModel::Index idx_offset = 0
 144         ) const;
 145
 146 };
 147
 148
 149 class BlockTypeRegistry {
 150
 151 public:
 152         BlockTypeRegistry();
 153
 154 public:
 155         Block::Type Add(const BlockType &);
 156
 157         size_t Size() const { return types.size(); }
 158
 159         BlockType *operator [](Block::Type id) { return &types[id]; }
 160         const BlockType *Get(Block::Type id) const { return &types[id]; }
 161
 162 private:
 163         std::vector<BlockType> types;
 164
 165 };
 166
 167 }
 168
 169 #endif