voxelman.world.gen.utils source code

1 /**
2 Copyright: Copyright (c) 2013-2016 Andrey Penechko.
3 License: $(WEB boost.org/LICENSE_1_0.txt, Boost License 1.0).
4 Authors: Andrey Penechko.
5 */
6 module voxelman.world.gen.utils;
7 
8 import std.experimental.logger;
9 import voxelman.math : ivec3, SimplexNoise;
10 
11 import voxelman.block.utils;
12 import voxelman.core.config;
13 import voxelman.utils.worker;
14 import voxelman.world.storage.chunk;
15 import voxelman.world.storage.coordinates;
16 
17 enum AIR = 1;
18 enum GRASS = 2;
19 enum DIRT = 3;
20 enum STONE = 4;
21 enum SAND = 5;
22 enum WATER = 6;
23 
24 struct ChunkGeneratorResult
25 {
26 	bool uniform;
27 	BlockId uniformBlockId;
28 }
29 
30 double noise2d(int x, int z)
31 {
32 	enum NUM_OCTAVES = 8;
33 	enum DIVIDER = 50; // bigger - smoother
34 	enum HEIGHT_MODIFIER = 4; // bigger - higher
35 
36 	double noise = 0.0;
37 	foreach(i; 1..NUM_OCTAVES+1)
38 	{
39 		// [-1; 1]
40 		noise += SimplexNoise.noise(cast(double)x/(DIVIDER*i), cast(double)z/(DIVIDER*i))*i*HEIGHT_MODIFIER;
41 	}
42 
43 	return noise;
44 }
45 
46 struct HeightmapChunkData
47 {
48 	int[CHUNK_SIZE_SQR] heightMap = void;
49 	int minHeight = int.max;
50 	int maxHeight = int.min;
51 
52 	void generate(ivec3 chunkOffset)
53 	{
54 		foreach(i, ref elem; heightMap)
55 		{
56 			int cx = i & CHUNK_SIZE_BITS;
57 			int cz = (i / CHUNK_SIZE) & CHUNK_SIZE_BITS;
58 			elem = cast(int)noise2d(chunkOffset.x + cx, chunkOffset.z + cz);
59 			if (elem > maxHeight)
60 				maxHeight = elem;
61 			if (elem < minHeight)
62 				minHeight = elem;
63 		}
64 	}
65 }