src/generator.cpp

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