From d78adcb9c931481ce54617eb2989498b2abab483 Mon Sep 17 00:00:00 2001
From: jacob <jacob@cagori.com>
Date: Fri, 17 Jan 2025 10:14:21 -0600
Subject: [PATCH] copy random noise resource to memory on startup

---
 src/app.c    | 24 ------------------------
 src/config.h |  2 +-
 src/rng.c    | 30 +++++++++++++++++++++++++++++-
 3 files changed, 30 insertions(+), 26 deletions(-)

diff --git a/src/app.c b/src/app.c
index 7d3306fb..4f154dd8 100644
--- a/src/app.c
+++ b/src/app.c
@@ -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
  * ========================== */
diff --git a/src/config.h b/src/config.h
index 7546209b..e9cd9c4d 100644
--- a/src/config.h
+++ b/src/config.h
@@ -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
diff --git a/src/rng.c b/src/rng.c
index 4c421021..b9187d35 100644
--- a/src/rng.c
+++ b/src/rng.c
@@ -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"));
     }