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#include <cglm/cglm.h>
#include <threads.h>
#include "utils.h"
#include "voxel.h"
static RcChunk **world_get_chunk_entry(World *world, int cx, int cy, int cz)
{
int side = RENDER_DISTANCE * 2 + 1;
ivec3 min, max;
glm_ivec3_subs(world->center, RENDER_DISTANCE, min);
glm_ivec3_adds(world->center, RENDER_DISTANCE, max);
if (cx < min[0] || cy < min[1] || cz < min[2])
return NULL;
if (cx > max[0] || cy > max[1] || cz > max[2])
return NULL;
int index = 0;
index += ((cx % side + side) % side);
index += ((cy % side + side) % side) * side;
index += ((cz % side + side) % side) * side * side;
return &world->chunks[index];
}
static void world_mark_chunk_for_update(World *world, int cx, int cy, int cz)
{
RcChunk **entry, *inner;
entry = world_get_chunk_entry(world, cx, cy, cz);
if (entry == NULL)
return;
inner = *entry;
if (inner == NULL)
return;
if (inner->chunk.state >= CHUNK_MESHED)
inner->chunk.state = CHUNK_GENERATED;
}
static void world_reload_chunk(World *world, int cx, int cy, int cz)
{
ivec3 pos = { cx, cy, cz };
RcChunk **entry, *inner;
entry = world_get_chunk_entry(world, cx, cy, cz);
if (entry == NULL)
return;
inner = *entry;
if (inner != NULL) {
if (glm_ivec3_eqv(inner->chunk.pos, pos)) {
return;
} else {
*entry = NULL;
world_lock(world);
rcchunk_drop(inner);
world_unlock(world);
}
}
inner = xalloc(sizeof(RcChunk));
inner->rc = 1;
chunk_init(&inner->chunk, cx, cy, cz);
chunk_generate(&inner->chunk, world->seed);
*entry = inner;
// mark neighboring chunks as mesh update needed
world_mark_chunk_for_update(world, cx - 1, cy, cz);
world_mark_chunk_for_update(world, cx + 1, cy, cz);
world_mark_chunk_for_update(world, cx, cy - 1, cz);
world_mark_chunk_for_update(world, cx, cy + 1, cz);
world_mark_chunk_for_update(world, cx, cy, cz - 1);
world_mark_chunk_for_update(world, cx, cy, cz + 1);
}
static void world_reload_chunks(World *world)
{
ivec3 min, max;
glm_ivec3_subs(world->center, RENDER_DISTANCE, min);
glm_ivec3_adds(world->center, RENDER_DISTANCE, max);
// clang-format off
for (int cx = min[0]; cx <= max[0]; cx++)
for (int cy = min[1]; cy <= max[1]; cy++)
for (int cz = min[2]; cz <= max[2]; cz++) {
world_reload_chunk(world, cx, cy, cz);
}
// clang-format on
}
void world_init(World *world, int seed)
{
int side = RENDER_DISTANCE * 2 + 1;
int size = side * side * side;
world->seed = seed;
world->loaded = false;
world->chunks = xzalloc(size * sizeof(RcChunk *));
glm_ivec3_zero(world->center);
mtx_init(&world->lock, mtx_plain);
}
void world_free(World *world)
{
int side = RENDER_DISTANCE * 2 + 1;
int size = side * side * side;
world_lock(world);
for (int i = 0; i < size; i++) {
RcChunk **entry = &world->chunks[i];
if (entry == NULL)
continue;
rcchunk_drop(*entry);
}
free(world->chunks);
mtx_destroy(&world->lock);
}
void world_lock(World *world)
{
mtx_lock(&world->lock);
}
void world_unlock(World *world)
{
mtx_unlock(&world->lock);
}
void world_update(World *world, Camera *camera)
{
ivec3 cp = CHUNK_VEC_V(camera->position);
if (!world->loaded || !glm_ivec3_eqv(world->center, cp)) {
// camera has moved, load new chunks
glm_ivec3_copy(cp, world->center);
world_reload_chunks(world);
}
}
void world_render(World *world, Renderer *renderer)
{
RcChunk *rc_chunk;
ivec3 min, max;
int world_size, mesh_quota;
glm_ivec3_subs(world->center, RENDER_DISTANCE, min);
glm_ivec3_adds(world->center, RENDER_DISTANCE, max);
// how many chunk we want to mesh at most
world_size = RENDER_DISTANCE * 2 + 1;
mesh_quota = world_size * world_size / 10;
// clang-format off
for (int cx = min[0]; cx <= max[0]; cx++)
for (int cy = min[1]; cy <= max[1]; cy++)
for (int cz = min[2]; cz <= max[2]; cz++) {
rc_chunk = world_get_chunk(world, cx, cy, cz);
if (rc_chunk == NULL)
continue;
if (rc_chunk->chunk.state < CHUNK_MESHING && mesh_quota > 0) {
chunk_mesh(&rc_chunk->chunk, world);
mesh_quota--;
}
if (rc_chunk->chunk.has_mesh)
renderer_draw(renderer, &rc_chunk->chunk);
rcchunk_drop(rc_chunk);
}
// clang-format on
}
RcChunk *world_get_chunk(World *world, int cx, int cy, int cz)
{
RcChunk **entry, *inner;
world_lock(world);
entry = world_get_chunk_entry(world, cx, cy, cz);
if (entry == NULL)
goto not_found;
inner = *entry;
if (inner == NULL)
goto not_found;
inner->rc += 1;
world_unlock(world);
return inner;
not_found:
world_unlock(world);
return NULL;
}
bool world_is_generated(World *world, int cx, int cy, int cz)
{
RcChunk *rc_chunk;
bool generated;
rc_chunk = world_get_chunk(world, cx, cy, cz);
if (rc_chunk == NULL)
return false;
generated = rc_chunk->chunk.state >= CHUNK_GENERATED;
rcchunk_drop(rc_chunk);
return generated;
}
Block world_get_block(World *world, int gx, int gy, int gz)
{
RcChunk *rc_chunk;
Block block;
ivec3 lp = LOCAL_VEC(gx, gy, gz);
ivec3 cp = CHUNK_VEC(gx, gy, gz);
rc_chunk = world_get_chunk(world, cp[0], cp[1], cp[2]);
if (rc_chunk == NULL)
return AIR;
block = chunk_at(&rc_chunk->chunk, lp[0], lp[1], lp[2]);
rcchunk_drop(rc_chunk);
return block;
}
void rcchunk_drop(RcChunk *rc_chunk)
{
rc_chunk->rc -= 1;
if (rc_chunk->rc == 0) {
chunk_free(&rc_chunk->chunk);
free(rc_chunk);
}
}
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