53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
#include <chrono>
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#include <cmath>
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#include "world.h"
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#include "bettola/game/chunk.h"
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#include "bettola/noise/fast_noise_lite.h"
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World::World(void) {
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_noise.SetSeed(std::chrono::high_resolution_clock::now().time_since_epoch().count());
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_noise.SetNoiseType(FastNoiseLite::NoiseType_Perlin);
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_noise.SetFrequency(0.02f);
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_noise.SetFractalType(FastNoiseLite::FractalType_FBm);
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_noise.SetFractalOctaves(5);
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_noise.SetFractalLacunarity(2.0f);
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_noise.SetFractalGain(0.5);
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/* Use a different seed for the detail noise. */
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_detail_noise.SetSeed(std::chrono::high_resolution_clock::now().time_since_epoch().count()+1);
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_detail_noise.SetNoiseType(FastNoiseLite::NoiseType_Perlin);
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_detail_noise.SetFrequency(0.2f); /* Higher frequency for smaller details. */
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}
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BettolaLib::Game::Chunk& World::get_chunk(int x, int z) {
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ChunkPos pos = {x, z};
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auto it = _chunks.find(pos);
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if(it != _chunks.end()) {
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return it->second;
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}
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/* If chunk doesn't exist, generate it. */
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BettolaLib::Game::Chunk& new_chunk = _chunks[pos];
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_generate_chunk(new_chunk, x, z);
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return new_chunk;
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}
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void World::_generate_chunk(BettolaLib::Game::Chunk& chunk, int chunk_x, int chunk_z) {
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for(int z = 0; z < BettolaLib::Game::CHUNK_DATA_HEIGHT; ++z) {
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for(int x = 0; x < BettolaLib::Game::CHUNK_DATA_WIDTH; ++x) {
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/* Calculate world coordinates. */
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float world_x = (float)(chunk_x * (BettolaLib::Game::CHUNK_WIDTH - 1)
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+ (x - BettolaLib::Game::CHUNK_BORDER_SIZE));
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float world_z = (float)(chunk_z * (BettolaLib::Game::CHUNK_HEIGHT - 1)
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+ (z - BettolaLib::Game::CHUNK_BORDER_SIZE));
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/* generate noise value. */
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chunk.heightmap[z * BettolaLib::Game::CHUNK_DATA_WIDTH + x] = fabsf(_noise.GetNoise(world_x, world_z));
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chunk.detailmap[z * BettolaLib::Game::CHUNK_DATA_WIDTH + x] = _detail_noise.GetNoise(world_x, world_z);
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}
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}
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}
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