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getrandomg

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Alexander Nutz
2025-09-27 21:39:09 +02:00
parent d02608c69d
commit 7e23cabfce
3 changed files with 11 additions and 17 deletions
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8
include/globals.h
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@@ -40,14 +40,6 @@
// Calculated from TIME_BETWEEN_TICKS
#define TICKS_PER_SECOND ((float)1000000 / TIME_BETWEEN_TICKS)
// Initial world generation seed, will be hashed on startup
// Used in generating terrain and biomes
#define INITIAL_WORLD_SEED 0xA103DE6C
// Initial general RNG seed, will be hashed on startup
// Used in random game events like item drops and mob behavior
#define INITIAL_RNG_SEED 0xE2B9419
// Size of each bilinearly interpolated area ("minichunk")
// For best performance, CHUNK_SIZE should be a power of 2
#define CHUNK_SIZE 8

4
src/globals.c
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@@ -31,8 +31,8 @@
ssize_t recv_count;
uint8_t recv_buffer[MAX_RECV_BUF_LEN] = {0};
uint32_t world_seed = INITIAL_WORLD_SEED;
uint32_t rng_seed = INITIAL_RNG_SEED;
uint32_t world_seed;
uint32_t rng_seed;
uint16_t world_time = 0;
uint32_t server_ticks = 0;

16
src/main.c
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@@ -27,6 +27,7 @@
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <sys/random.h>
#endif
#include <unistd.h>
#include <time.h>
@@ -506,15 +507,16 @@ int main () {
}
#endif
// Hash the seeds to ensure they're random enough
world_seed = splitmix64(world_seed);
printf("World seed (hashed): ");
if (0) { // TODO: manual seed
world_seed = splitmix64(world_seed);
} else {
getrandom(&world_seed, 4, GRND_RANDOM);
}
printf("World seed: ");
for (int i = 3; i >= 0; i --) printf("%X", (unsigned int)((world_seed >> (8 * i)) & 255));
printf("\n");
rng_seed = splitmix64(rng_seed);
printf("\nRNG seed (hashed): ");
for (int i = 3; i >= 0; i --) printf("%X", (unsigned int)((rng_seed >> (8 * i)) & 255));
printf("\n\n");
getrandom(&rng_seed, 4, GRND_RANDOM);
// Initialize block changes entries as unallocated
for (int i = 0; i < MAX_BLOCK_CHANGES; i ++) {