src/world.cpp

   1 #include "world.hpp"
   2
   3 #include <limits>
   4 #include <glm/gtx/transform.hpp>
   5
   6
   7 namespace blank {
   8
   9 World::World()
  10 : blockType()
  11 , blockShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }})
  12 , stairShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }}, { 0.0f, 0.0f })
  13 , slabShape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.0f, 0.5f }})
  14 , generate(0)
  15 , chunks(blockType, generate)
  16 , player() {
  17         BlockType::Faces block_fill = {  true,  true,  true,  true,  true,  true };
  18         BlockType::Faces slab_fill  = { false,  true, false, false, false, false };
  19         BlockType::Faces stair_fill = { false,  true, false, false, false,  true };
  20
  21         { // white block
  22                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &blockShape);
  23                 type.fill = block_fill;
  24                 blockType.Add(type);
  25         }
  26         { // white slab
  27                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &slabShape);
  28                 type.fill = slab_fill;
  29                 blockType.Add(type);
  30         }
  31         { // white stair
  32                 BlockType type(true, { 1.0f, 1.0f, 1.0f }, &stairShape);
  33                 type.fill = stair_fill;
  34                 blockType.Add(type);
  35         }
  36
  37         { // red block
  38                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &blockShape);
  39                 type.fill = block_fill;
  40                 blockType.Add(type);
  41         }
  42         { // red slab
  43                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &slabShape);
  44                 type.fill = slab_fill;
  45                 blockType.Add(type);
  46         }
  47         { // red stair
  48                 BlockType type(true, { 1.0f, 0.0f, 0.0f }, &stairShape);
  49                 type.fill = stair_fill;
  50                 blockType.Add(type);
  51         }
  52
  53         { // green block
  54                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &blockShape);
  55                 type.fill = block_fill;
  56                 blockType.Add(type);
  57         }
  58         { // green slab
  59                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &slabShape);
  60                 type.fill = slab_fill;
  61                 blockType.Add(type);
  62         }
  63         { // green stair
  64                 BlockType type(true, { 0.0f, 1.0f, 0.0f }, &stairShape);
  65                 type.fill = stair_fill;
  66                 blockType.Add(type);
  67         }
  68
  69         { // blue block
  70                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &blockShape);
  71                 type.fill = block_fill;
  72                 blockType.Add(type);
  73         }
  74         { // blue slab
  75                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &slabShape);
  76                 type.fill = slab_fill;
  77                 blockType.Add(type);
  78         }
  79         { // blue stair
  80                 BlockType type(true, { 0.0f, 0.0f, 1.0f }, &stairShape);
  81                 type.fill = stair_fill;
  82                 blockType.Add(type);
  83         }
  84
  85         generate.Space(0);
  86         generate.Solids({ 1, 4, 7, 10 });
  87
  88         player.Position({ 4.0f, 4.0f, 4.0f });
  89
  90         chunks.Generate({ -4, -4, -4 }, { 5, 5, 5});
  91 }
  92
  93
  94 namespace {
  95
  96 struct Candidate {
  97         Chunk *chunk;
  98         float dist;
  99 };
 100
 101 std::vector<Candidate> candidates;
 102
 103 }
 104
 105 bool World::Intersection(
 106                 const Ray &ray,
 107                 const glm::mat4 &M,
 108                 Chunk **chunk,
 109                 int *blkid,
 110                 float *dist,
 111                 glm::vec3 *normal) {
 112         candidates.clear();
 113
 114         for (Chunk &cur_chunk : chunks.Loaded()) {
 115                 float cur_dist;
 116                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(player.ChunkCoords()), cur_dist)) {
 117                         candidates.push_back({ &cur_chunk, cur_dist });
 118                 }
 119         }
 120
 121         if (candidates.empty()) return false;
 122
 123         Chunk *closest_chunk = nullptr;
 124         float closest_dist = std::numeric_limits<float>::infinity();
 125         int closest_blkid = -1;
 126         glm::vec3 closest_normal;
 127
 128         for (Candidate &cand : candidates) {
 129                 if (cand.dist > closest_dist) continue;
 130                 int cur_blkid;
 131                 float cur_dist;
 132                 glm::vec3 cur_normal;
 133                 if (cand.chunk->Intersection(ray, M * cand.chunk->Transform(player.ChunkCoords()), cur_blkid, cur_dist, cur_normal)) {
 134                         if (cur_dist < closest_dist) {
 135                                 closest_chunk = cand.chunk;
 136                                 closest_blkid = cur_blkid;
 137                                 closest_dist = cur_dist;
 138                                 closest_normal = cur_normal;
 139                         }
 140                 }
 141         }
 142
 143         if (chunk) {
 144                 *chunk = closest_chunk;
 145         }
 146         if (blkid) {
 147                 *blkid = closest_blkid;
 148         }
 149         if (dist) {
 150                 *dist = closest_dist;
 151         }
 152         if (normal) {
 153                 *normal = closest_normal;
 154         }
 155         return closest_chunk;
 156 }
 157
 158
 159 Chunk &World::Next(const Chunk &to, const glm::tvec3<int> &dir) {
 160         const Chunk::Pos tgt_pos = to.Position() + dir;
 161         return chunks.ForceLoad(tgt_pos);
 162 }
 163
 164
 165 void World::Update(int dt) {
 166         player.Update(dt);
 167         chunks.Rebase(player.ChunkCoords());
 168         chunks.Update();
 169 }
 170
 171
 172 void World::Render(DirectionalLighting &program) {
 173         program.SetLightDirection({ -1.0f, -3.0f, -2.0f });
 174         program.SetView(glm::inverse(player.Transform(player.ChunkCoords())));
 175
 176         for (Chunk &chunk : chunks.Loaded()) {
 177                 glm::mat4 m(chunk.Transform(player.ChunkCoords()));
 178                 program.SetM(m);
 179                 glm::mat4 mvp(program.GetVP() * m);
 180                 if (!CullTest(Chunk::Bounds(), mvp)) {
 181                         chunk.Draw();
 182                 }
 183         }
 184 }
 185
 186 }