src/world/Generator.cpp

   1 #include "Generator.hpp"
   2
   3 #include "Chunk.hpp"
   4 #include "../rand/OctaveNoise.hpp"
   5
   6 #include <glm/glm.hpp>
   7
   8
   9 namespace blank {
  10
  11 Generator::Generator(const Config &config) noexcept
  12 : solidNoise(config.seed)
  13 , typeNoise(config.seed)
  14 , stretch(1.0f/config.stretch)
  15 , solid_threshold(config.solid_threshold)
  16 // TODO: stable dynamic generator configuration
  17 , space(0)
  18 , light(13)
  19 , solids({ 1, 4, 7, 10 }) {
  20
  21 }
  22
  23
  24 void Generator::operator ()(Chunk &chunk) const noexcept {
  25         Chunk::Pos pos(chunk.Position());
  26         glm::vec3 coords(pos * Chunk::Extent());
  27         for (int z = 0; z < Chunk::depth; ++z) {
  28                 for (int y = 0; y < Chunk::height; ++y) {
  29                         for (int x = 0; x < Chunk::width; ++x) {
  30                                 Block::Pos block_pos(x, y, z);
  31                                 glm::vec3 gen_pos = (coords + block_pos) * stretch;
  32                                 float val = OctaveNoise(solidNoise, coords + block_pos, 3, 0.5f, stretch, 2.0f);
  33                                 if (val > solid_threshold) {
  34                                         int type_val = int((typeNoise(gen_pos) + 1.0f) * solids.size()) % solids.size();
  35                                         chunk.SetBlock(block_pos, Block(solids[type_val]));
  36                                 } else {
  37                                         chunk.SetBlock(block_pos, Block(space));
  38                                 }
  39                         }
  40                 }
  41         }
  42         unsigned int random = 263167 * pos.x + 2097593 * pos.y + 426389 * pos.z;
  43         for (int index = 0; index < Chunk::size; ++index) {
  44                 if (chunk.IsSurface(index)) {
  45                         random = random * 666649 + 7778777;
  46                         if ((random % 32) == 0) {
  47                                 chunk.SetBlock(index, Block(light));
  48                         }
  49                 }
  50         }
  51 }
  52
  53 }