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 = &AddEntity();
  89         player->Position({ 4.0f, 4.0f, 4.0f });
  90
  91         chunks.Generate({ -4, -4, -4 }, { 5, 5, 5});
  92 }
  93
  94
  95 namespace {
  96
  97 struct Candidate {
  98         Chunk *chunk;
  99         float dist;
 100 };
 101
 102 std::vector<Candidate> candidates;
 103
 104 }
 105
 106 bool World::Intersection(
 107                 const Ray &ray,
 108                 const glm::mat4 &M,
 109                 Chunk **chunk,
 110                 int *blkid,
 111                 float *dist,
 112                 glm::vec3 *normal) {
 113         candidates.clear();
 114
 115         for (Chunk &cur_chunk : chunks.Loaded()) {
 116                 float cur_dist;
 117                 if (cur_chunk.Intersection(ray, M * cur_chunk.Transform(player->ChunkCoords()), cur_dist)) {
 118                         candidates.push_back({ &cur_chunk, cur_dist });
 119                 }
 120         }
 121
 122         if (candidates.empty()) return false;
 123
 124         Chunk *closest_chunk = nullptr;
 125         float closest_dist = std::numeric_limits<float>::infinity();
 126         int closest_blkid = -1;
 127         glm::vec3 closest_normal;
 128
 129         for (Candidate &cand : candidates) {
 130                 if (cand.dist > closest_dist) continue;
 131                 int cur_blkid;
 132                 float cur_dist;
 133                 glm::vec3 cur_normal;
 134                 if (cand.chunk->Intersection(ray, M * cand.chunk->Transform(player->ChunkCoords()), cur_blkid, cur_dist, cur_normal)) {
 135                         if (cur_dist < closest_dist) {
 136                                 closest_chunk = cand.chunk;
 137                                 closest_blkid = cur_blkid;
 138                                 closest_dist = cur_dist;
 139                                 closest_normal = cur_normal;
 140                         }
 141                 }
 142         }
 143
 144         if (chunk) {
 145                 *chunk = closest_chunk;
 146         }
 147         if (blkid) {
 148                 *blkid = closest_blkid;
 149         }
 150         if (dist) {
 151                 *dist = closest_dist;
 152         }
 153         if (normal) {
 154                 *normal = closest_normal;
 155         }
 156         return closest_chunk;
 157 }
 158
 159
 160 Chunk &World::Next(const Chunk &to, const glm::tvec3<int> &dir) {
 161         const Chunk::Pos tgt_pos = to.Position() + dir;
 162         return chunks.ForceLoad(tgt_pos);
 163 }
 164
 165
 166 void World::Update(int dt) {
 167         for (Entity &entity : entities) {
 168                 entity.Update(dt);
 169         }
 170         chunks.Rebase(player->ChunkCoords());
 171         chunks.Update();
 172 }
 173
 174
 175 void World::Render(DirectionalLighting &program) {
 176         program.SetLightDirection({ -1.0f, -3.0f, -2.0f });
 177         program.SetView(glm::inverse(player->Transform(player->ChunkCoords())));
 178
 179         for (Chunk &chunk : chunks.Loaded()) {
 180                 glm::mat4 m(chunk.Transform(player->ChunkCoords()));
 181                 program.SetM(m);
 182                 glm::mat4 mvp(program.GetVP() * m);
 183                 if (!CullTest(Chunk::Bounds(), mvp)) {
 184                         chunk.Draw();
 185                 }
 186         }
 187
 188         for (Entity &entity : entities) {
 189                 if (entity.HasShape()) {
 190                         program.SetM(entity.Transform(player->ChunkCoords()));
 191                         entity.Draw();
 192                 }
 193         }
 194 }
 195
 196 }