From ef8b2edc6322b090184fa596da10d870073b514e Mon Sep 17 00:00:00 2001
From: Gwilym Kuiper <gw@ilym.me>
Date: Sun, 13 Mar 2022 19:53:07 +0000
Subject: [PATCH] Also dma the palette in backgrounds

---
 agb/src/display/tiled/vram_manager.rs | 8 ++++++--
 agb/src/memory_mapped.rs              | 4 ++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/agb/src/display/tiled/vram_manager.rs b/agb/src/display/tiled/vram_manager.rs
index 7f375339..5c99f89f 100644
--- a/agb/src/display/tiled/vram_manager.rs
+++ b/agb/src/display/tiled/vram_manager.rs
@@ -266,8 +266,12 @@ impl<'a> VRamManager<'a> {
     }
 
     fn set_background_palette(&mut self, pal_index: u8, palette: &palette16::Palette16) {
-        for (colour_index, &colour) in palette.colours.iter().enumerate() {
-            PALETTE_BACKGROUND.set(pal_index as usize * 16 + colour_index, colour);
+        unsafe {
+            dma_copy16(
+                palette.colours.as_ptr(),
+                PALETTE_BACKGROUND.as_ptr().add(16 * pal_index as usize),
+                palette.colours.len(),
+            );
         }
     }
 
diff --git a/agb/src/memory_mapped.rs b/agb/src/memory_mapped.rs
index 940f3d77..57b5bb51 100644
--- a/agb/src/memory_mapped.rs
+++ b/agb/src/memory_mapped.rs
@@ -57,6 +57,10 @@ impl<T, const N: usize> MemoryMapped1DArray<T, N> {
     pub fn set(&self, n: usize, val: T) {
         unsafe { (&mut (*self.array)[n] as *mut T).write_volatile(val) }
     }
+
+    pub fn as_ptr(&self) -> *mut T {
+        self.array.cast()
+    }
 }
 
 pub struct MemoryMapped2DArray<T, const X: usize, const Y: usize> {