From: Lukas Krickl <lukas@krickl.dev>
Date: Sat, 15 Feb 2025 05:49:04 +0000 (+0100)
Subject: rand: srand is now stored in sram
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=refs%2Fremotes%2Forigin%2Fstate-machine-movement;p=gbrg%2F.git

rand: srand is now stored in sram

This makes it so srand is not always the same value on boot.
---

diff --git a/src/rand.s b/src/rand.s
index 97b6f6d..f0a22db 100644
--- a/src/rand.s
+++ b/src/rand.s
@@ -1,9 +1,22 @@
   ; inits the random seed 
 rand_init:
-  ld a, SRAND_INITIAL
+  call mbc1_ram_enable
+
+  ld a, [sram_srand] 
   ld [srand], a
+
+  call mbc1_ram_disable
   ret
 
+  ; saves srand in sram
+rand_save_srand:
+  call mbc1_ram_enable
+  
+  ld a, [srand]
+  ld [sram_srand], a
+
+  call mbc1_ram_disable
+  ret
 
   ; gets a pseudo-random number
   ; and advances to the next seed
diff --git a/src/sram.s b/src/sram.s
index f4e62ea..a67ffff 100644
--- a/src/sram.s
+++ b/src/sram.s
@@ -9,5 +9,5 @@
 
   ; flag for init of sram
 sram_magic: .adv 1
-
+sram_srand: .adv 1
 save_game1: .adv save_game_size
diff --git a/src/update.s b/src/update.s
index ad43149..cdfbefb 100644
--- a/src/update.s
+++ b/src/update.s
@@ -9,7 +9,8 @@ update_game_over:
 
 update_game:
   ; tick rng every frame
-  call rand 
+  call rand
+  call rand_save_srand
 
   ; update player
   ld hl, player