From 4dd7a033ac3c01011b6b625f597e7d9926097a5e Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Sat, 31 Aug 2024 10:28:27 -0500
Subject: [PATCH] palette

---
 addresses_arm9.lds |  4 ++--
 main.c             |  4 ++--
 palette.h          | 30 ++++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+), 4 deletions(-)
 create mode 100644 palette.h

diff --git a/addresses_arm9.lds b/addresses_arm9.lds
index 2714bde..a890ae2 100644
--- a/addresses_arm9.lds
+++ b/addresses_arm9.lds
@@ -1,4 +1,4 @@
 io_registers = 0x04000000;
-pram = 0x05000000;
-oam = 0x07000000;
+palette_ram = 0x05000000;
 bg_vram = 0x06000000;
+oam = 0x07000000;
diff --git a/main.c b/main.c
index e1dc00d..5295112 100644
--- a/main.c
+++ b/main.c
@@ -1,6 +1,7 @@
 #include "io_registers.h"
 #include "bits.h"
 #include "bg.h"
+#include "palette.h"
 
 #include "res/player.h"
 #include "res/player.pal.h"
@@ -41,10 +42,9 @@ void main()
 
   // palette ram
   for (int i = 0; i < 15; i++) {
-    ((volatile uint16_t *)(0x05000000))[i] = rgb555(&pal[i * 3]);
+    palette_ram.a.bg.palette[0].color[i] = rgb555(&pal[i * 3]);
   }
 
-
   const uint8_t * data = (const uint8_t *)&_binary_res_player_data_start;
 
 
diff --git a/palette.h b/palette.h
new file mode 100644
index 0000000..a1ed7dd
--- /dev/null
+++ b/palette.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stdint.h>
+
+#define static_assert _Static_assert
+
+struct color16 {
+  uint16_t color[16];
+};
+static_assert((sizeof (struct color16)) == 0x20);
+
+union palette {
+  struct color16 palette[16];
+  uint16_t color[256];
+};
+static_assert((sizeof (union palette)) == 0x200);
+
+struct palette_bg_obj {
+  union palette bg;
+  union palette obj;
+};
+static_assert((sizeof (struct palette_bg_obj)) == 0x400);
+
+struct palette_a_b {
+  struct palette_bg_obj a;
+  struct palette_bg_obj b;
+};
+static_assert((sizeof (struct palette_a_b)) == 0x800);
+
+extern struct palette_a_b palette_ram __asm("palette_ram");