1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
#include <stdlib.h>
#include <cglm/ivec3.h>
#include <worldgen.h>
// Store the xyz position given an index
static void global_position(ivec3 *pos, usize idx) {
const isize chunk_idx = idx / CHUNK_SIZE;
const isize local_idx = idx % CHUNK_SIZE;
const isize local_x = local_idx % CHUNK_WIDTH;
const isize local_y = local_idx / (CHUNK_LENGTH * CHUNK_WIDTH);
const isize local_z = (local_idx - (CHUNK_LENGTH * CHUNK_WIDTH * local_y)) / CHUNK_WIDTH;
const isize chunk_x = chunk_idx % WORLD_WIDTH;
const isize chunk_z = chunk_idx / WORLD_WIDTH;
const isize y = local_y; // height
const isize z = local_z + chunk_z * CHUNK_LENGTH; // length
const isize x = local_x + chunk_x * CHUNK_WIDTH; // width
*pos[0] = x;
*pos[1] = y;
*pos[2] = z;
}
// Return the index from xyz position
static usize global_idx(ivec3 pos) {
int x = pos[0];
int y = pos[1];
int z = pos[2];
usize chunk_x = x / CHUNK_WIDTH;
usize chunk_z = z / CHUNK_LENGTH;
usize chunk_idx = chunk_z * WORLD_WIDTH + chunk_x;
usize local_x = x % CHUNK_WIDTH;
usize local_y = y;
usize local_z = z % CHUNK_LENGTH;
usize local_idx = local_y * CHUNK_LENGTH * CHUNK_WIDTH
+ local_z * CHUNK_WIDTH
+ local_x;
return chunk_idx * CHUNK_SIZE + local_idx;
}
// Chunks are laid out in worldspace as [c1, ..., cN]
static void gen_chunk(u8 *chunk, usize z, usize x) {
// Flat chunks
for (usize yy = 0; yy < CHUNK_HEIGHT / 4; yy++) {
for (usize zz = 0; zz < CHUNK_LENGTH; zz++) {
for (usize xx = 0; xx < CHUNK_WIDTH; xx++) {
chunk[yy * CHUNK_LENGTH * CHUNK_WIDTH
+ zz * CHUNK_WIDTH
+ xx] = BLOCK_grass;
}
}
}
}
void gen_terrain(u8 *world) {
if (world == NULL) {
world = calloc(WORLD_SIZE * CHUNK_SIZE, sizeof(u8));
}
for (usize z = 0; z < WORLD_WIDTH; z++) {
for (usize x = 0; x < WORLD_LENGTH; x++) {
gen_chunk(&world[
z * WORLD_LENGTH * CHUNK_SIZE
+ x * CHUNK_SIZE
], z, x);
}
}
// y: height
// z: depth/length
// x: width
// "house"
for (usize y = 0; y < 4; y++) {
for (usize z = 0; z < 7; z++) {
for (usize x = 0; x < 9; x++) {
if (z > 0 && z < 6 && x > 0 && x < 8) continue;
ivec3 pos = { CHUNK_WIDTH * WORLD_WIDTH / 2 + x - 4
, ((CHUNK_HEIGHT / 4) + y)
, CHUNK_LENGTH * WORLD_LENGTH / 2 + z - 4
};
world[global_idx(pos)] = BLOCK_rock;
}
}
}
// Doorway
ivec3 pos = { CHUNK_WIDTH * WORLD_WIDTH / 2
, (CHUNK_HEIGHT / 4)
, CHUNK_LENGTH * WORLD_LENGTH / 2 + 2
};
world[global_idx(pos)] = BLOCK_none;
pos[1]++;
world[global_idx(pos)] = BLOCK_none;
}
|
