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#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(u32 *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++) {
ivec3 pos = {xx,yy,zz};
chunk[global_idx(pos)] = BLOCK_grass;
//chunk[yy * CHUNK_LENGTH * CHUNK_WIDTH
// + zz * CHUNK_WIDTH
// + xx] = BLOCK_grass;
}
}
}
for (usize zz = 0; zz < CHUNK_LENGTH; zz++) {
for (usize xx = 0; xx < CHUNK_WIDTH; xx++) {
if (zz % 2 != 0) continue;
if (xx % 2 != 0) continue;
chunk[(CHUNK_HEIGHT / 4 + 0) * CHUNK_LENGTH * CHUNK_WIDTH
+ zz * CHUNK_WIDTH
+ xx] = BLOCK_rock;
}
}
}
void gen_terrain(u32 *world) {
if (world == NULL) {
world = calloc(WORLD_SIZE * CHUNK_SIZE, sizeof(u8));
}
for (usize z = 0; z < WORLD_LENGTH; z++) {
for (usize x = 0; x < WORLD_WIDTH; x++) {
gen_chunk(&world[
z * WORLD_WIDTH * 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;
// Mask everything
for (usize z = 0; z < WORLD_LENGTH; z++) {
for (usize x = 0; x < WORLD_WIDTH; x++) {
u32 * restrict chunk = &world[
z * WORLD_WIDTH * CHUNK_SIZE
+ x * CHUNK_SIZE
];
for (isize yy = 0; yy < CHUNK_HEIGHT; yy++) {
for (isize zz = 0; zz < CHUNK_LENGTH; zz++) {
for (isize xx = 0; xx < CHUNK_WIDTH; xx++) {
u32 mask = 0;
// TODO: Fix OOB access
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
for (int k = 0; k < 3; k++) {
if (i == 0 && yy - 1 < 0) continue;
if (j == 0 && zz - 1 < 0) continue;
if (k == 0 && xx - 1 < 0) continue;
if (i == 2 && yy + 1 >= CHUNK_HEIGHT) continue;
if (j == 2 && zz + 1 >= CHUNK_LENGTH) continue;
if (k == 2 && xx + 1 >= CHUNK_WIDTH) continue;
if (
chunk[(i + yy - 1) * CHUNK_LENGTH * CHUNK_WIDTH
+ (j + zz - 1) * CHUNK_WIDTH
+ (k + xx - 1)] & ((1 << 5) - 1)
) {
mask |= 1 << ((i * 9) + j * 3 + k);
}
}
}
}
if (yy == 0) {
mask |= FILLED_MASK_BOT;
}
chunk[yy * CHUNK_LENGTH * CHUNK_WIDTH
+ zz * CHUNK_WIDTH
+ xx] |= mask << 5;
}
}
}
}
}
// Mask chunk borders
for (usize z = 0; z < WORLD_LENGTH; z++) {
for (usize x = 0; x < WORLD_WIDTH; x++) {
u32 * restrict chunk = &world[
z * WORLD_WIDTH * CHUNK_SIZE
+ x * CHUNK_SIZE
];
// LEFT (-X)
if (x > 0) {
u32 * restrict lchunk = &world[
z * WORLD_WIDTH * CHUNK_SIZE
+ (x - 1) * CHUNK_SIZE
];
// local YZ
for (isize ly = 0; ly < CHUNK_HEIGHT; ly++) {
for (isize lz = 0; lz < CHUNK_LENGTH; lz++) {
u32 mask = 0;
// neighbouring xy
for (isize i = 0; i < 3; i++) {
for (isize j = 0; j < 3; j++) {
if (i == 0 && ly - 1 < 0) continue;
if (j == 0 && lz - 1 < 0) continue;
if (i == 2 && ly + 1 >= CHUNK_HEIGHT) continue;
if (j == 2 && lz + 1 >= CHUNK_LENGTH) continue;
ivec3 pos = {CHUNK_WIDTH - 1, i + ly - 1, j + lz - 1};
if (lchunk[global_idx(pos)] & (((1 << 5) - 1))) {
mask |= 1 << (i * 9 + j * 3);
}
}
}
ivec3 pos = {0, ly, lz};
chunk[ly * CHUNK_LENGTH * CHUNK_WIDTH
+ lz * CHUNK_WIDTH
+ 0] |= mask << 5;
}
}
}
// RIGHT (+X)
if (x < WORLD_WIDTH - 1) {
u32 * restrict rchunk = &world[
z * WORLD_WIDTH * CHUNK_SIZE
+ (x + 1) * CHUNK_SIZE
];
// local YZ
for (isize ly = 0; ly < CHUNK_HEIGHT; ly++) {
for (isize lz = 0; lz < CHUNK_LENGTH; lz++) {
u32 mask = 0;
// neighbouring xy
for (isize i = 0; i < 3; i++) {
for (isize j = 0; j < 3; j++) {
if (i == 0 && ly - 1 < 0) continue;
if (j == 0 && lz - 1 < 0) continue;
if (i == 2 && ly + 1 >= CHUNK_HEIGHT) continue;
if (j == 2 && lz + 1 >= CHUNK_LENGTH) continue;
ivec3 pos = {0, i + ly - 1, j + lz - 1};
if (rchunk[global_idx(pos)] & (((1 << 5) - 1))) {
mask |= 1 << (i * 9 + j * 3 + 2);
}
}
}
ivec3 pos = {CHUNK_WIDTH - 1, ly, lz};
chunk[ly * CHUNK_LENGTH * CHUNK_WIDTH
+ lz * CHUNK_WIDTH
+ (CHUNK_WIDTH - 1)] |= mask << 5;
}
}
}
// BACK (-Z)
if (z > 0) {
u32 * restrict bchunk = &world[
(z - 1) * WORLD_WIDTH * CHUNK_SIZE
+ x * CHUNK_SIZE
];
// local YZ
for (isize ly = 0; ly < CHUNK_HEIGHT; ly++) {
for (isize lx = 0; lx < CHUNK_LENGTH; lx++) {
u32 mask = 0;
// neighbouring xy
for (isize i = 0; i < 3; i++) {
for (isize j = 0; j < 3; j++) {
if (i == 0 && ly - 1 < 0) continue;
if (j == 0 && lx - 1 < 0) continue;
if (i == 2 && ly + 1 >= CHUNK_HEIGHT) continue;
if (j == 2 && lx + 1 >= CHUNK_WIDTH) continue;
ivec3 pos = {j + lx - 1, i + ly - 1, CHUNK_LENGTH - 1};
if (bchunk[global_idx(pos)] & (((1 << 5) - 1))) {
mask |= 1 << (i * 9 + j);
}
}
}
ivec3 pos = {lx, ly, 0};
chunk[ly * CHUNK_LENGTH * CHUNK_WIDTH
+ 0
+ lx] |= mask << 5;
}
}
}
// FRONT (+Z)
if (z < WORLD_LENGTH - 1) {
u32 * restrict rchunk = &world[
(z + 1) * WORLD_WIDTH * CHUNK_SIZE
+ x * CHUNK_SIZE
];
// local YZ
for (isize ly = 0; ly < CHUNK_HEIGHT; ly++) {
for (isize lx = 0; lx < CHUNK_WIDTH; lx++) {
u32 mask = 0;
// neighbouring xy
for (isize i = 0; i < 3; i++) {
for (isize j = 0; j < 3; j++) {
if (i == 0 && ly - 1 < 0) continue;
if (j == 0 && lx - 1 < 0) continue;
if (i == 2 && ly + 1 >= CHUNK_HEIGHT) continue;
if (j == 2 && lx + 1 >= CHUNK_WIDTH) continue;
ivec3 pos = {j + lx - 1, i + ly - 1, 0};
if (rchunk[global_idx(pos)] & (((1 << 5) - 1))) {
mask |= 1 << (i * 9 + j + 6);
}
}
}
ivec3 pos = {lx, ly, CHUNK_LENGTH - 1};
chunk[ly * CHUNK_LENGTH * CHUNK_WIDTH
+ (CHUNK_LENGTH - 1) * CHUNK_WIDTH
+ lx] |= mask << 5;
}
}
}
}
}
}
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