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copy random noise resource to memory on startup

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jacob 2025-01-17 10:14:21 -06:00
parent e6cea55854
commit d78adcb9c9
3 changed files with 30 additions and 26 deletions
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24
src/app.c
View File

@ -118,30 +118,6 @@ void app_register_exit_callback(app_exit_callback_func *func)
sys_mutex_unlock(&lock);
}
/* ========================== *
* Generate random number file
* (unused function)
* ========================== */
#if 0
#include "rng.h"
INTERNAL void gen_random_file(struct string path, u32 count)
{
{
/* Clear file */
struct sys_file f = sys_file_open_write(path);
sys_file_write(f, BUFFER(0, 0));
sys_file_close(f);
}
struct sys_file f = sys_file_open_append(path);
for (u32 i = 0; i < count; ++i) {
u64 rand = rng_rand_u64();
sys_file_write(f, BUFFER_FROM_STRUCT(&rand));
}
sys_file_close(f);
}
#endif
/* ========================== *
* Entry point
* ========================== */

2
src/config.h
View File

@ -29,7 +29,7 @@
#define PIXELS_PER_UNIT 256.0
#define GAME_FPS 100.0
#define GAME_FPS 50.0
#define GAME_TIMESCALE 1
#define GAME_PHYSICS_SUBSTEPS 4

30
src/rng.c
View File

@ -1,12 +1,37 @@
#include "rng.h"
#include "sys.h"
#include "resource.h"
#include "arena.h"
GLOBAL struct {
struct arena arena;
u64 *noise;
u64 noise_count;
} G = ZI, DEBUG_ALIAS(G, G_rng);
/* ========================== *
* Generate random number file
* (unused function)
* ========================== */
#if 0
INTERNAL void gen_random_file(struct string path, u32 count)
{
{
/* Clear file */
struct sys_file f = sys_file_open_write(path);
sys_file_write(f, BUFFER(0, 0));
sys_file_close(f);
}
struct sys_file f = sys_file_open_append(path);
for (u32 i = 0; i < count; ++i) {
u64 rand = rng_rand_u64();
sys_file_write(f, BUFFER_FROM_STRUCT(&rand));
}
sys_file_close(f);
}
#endif
/* ========================== *
* Startup
* ========================== */
@ -14,11 +39,14 @@ GLOBAL struct {
struct rng_startup_receipt rng_startup(struct resource_startup_receipt *resource_sr)
{
(UNUSED)resource_sr;
G.arena = arena_alloc(GIGABYTE(64));
struct string rand_path = STR("res/rand.dat");
if (resource_exists(rand_path)) {
struct resource r = resource_open(rand_path);
G.noise = (u64 *)r.bytes.data;
G.noise_count = r.bytes.size / sizeof(*G.noise);
G.noise = arena_push_array(&G.arena, u64, G.noise_count);
MEMCPY(G.noise, r.bytes.data, r.bytes.size);
resource_close(r);
} else {
sys_panic(STR("Failed to locate pre-computed noise resource"));
}