4 files changed, 83 insertions, 2 deletions
diff --git a/include/gba/defines.h b/include/gba/defines.h
index 4fd54975d..ea363109f 100644
--- a/include/gba/defines.h
+++ b/include/gba/defines.h
@@ -70,4 +70,9 @@
 
 #define TOTAL_OBJ_TILE_COUNT 1024
 
+#define RGB(r, g, b) ((r) | ((g) << 5) | ((b) << 10))
+
+#define RGB_BLACK RGB(0, 0, 0)
+#define RGB_WHITE RGB(31, 31, 31)
+
 #endif // GUARD_GBA_DEFINES
diff --git a/include/gba/syscall.h b/include/gba/syscall.h
index 2008128d3..3f41abba1 100644
--- a/include/gba/syscall.h
+++ b/include/gba/syscall.h
@@ -21,11 +21,11 @@ void VBlankIntrWait(void);
 #define CPU_SET_16BIT     0x00000000
 #define CPU_SET_32BIT     0x04000000
 
-void CpuSet(void *src, void *dest, u32 control);
+void CpuSet(const void *src, void *dest, u32 control);
 
 #define CPU_FAST_SET_SRC_FIXED 0x01000000
 
-void CpuFastSet(void *src, void *dest, u32 control);
+void CpuFastSet(const void *src, void *dest, u32 control);
 
 void ObjAffineSet(struct ObjAffineSrcData *src, void *dest, s32 count, s32 offset);
 
diff --git a/include/gba/types.h b/include/gba/types.h
index 1274d4f0d..740c72d92 100644
--- a/include/gba/types.h
+++ b/include/gba/types.h
@@ -26,6 +26,14 @@ typedef u8  bool8;
 typedef u16 bool16;
 typedef u32 bool32;
 
+struct PlttData
+{
+    u16 r:5; // red
+    u16 g:5; // green
+    u16 b:5; // blue
+    u16 unused_15:1;
+};
+
 struct OamData
 {
     u32 y:8;
diff --git a/include/palette.h b/include/palette.h
new file mode 100644
index 000000000..de2cf0083
--- /dev/null
+++ b/include/palette.h
@@ -0,0 +1,68 @@
+#ifndef GUARD_PALETTE_H
+#define GUARD_PALETTE_H
+
+#include "global.h"
+
+#define gPaletteFade_selectedPalettes (gPaletteFade.multipurpose1) // normal and fast fade
+#define gPaletteFade_blendCnt         (gPaletteFade.multipurpose1) // hardware fade
+#define gPaletteFade_delay            (gPaletteFade.multipurpose2) // normal and hardware fade
+#define gPaletteFade_submode          (gPaletteFade.multipurpose2) // fast fade
+
+enum
+{
+    FAST_FADE_IN_FROM_WHITE,
+    FAST_FADE_OUT_TO_WHTIE,
+    FAST_FADE_IN_FROM_BLACK,
+    FAST_FADE_OUT_TO_BLACK,
+};
+
+struct PaletteFadeControl
+{
+    u32 multipurpose1;
+    u8 delayCounter:6;
+    u16 y:5; // blend coefficient
+    u16 targetY:5; // target blend coefficient
+    u16 blendColor:15;
+    u16 active:1;
+    u16 multipurpose2:6;
+    u16 yDec:1; // whether blend coefficient is decreasing
+    u16 bufferTransferDisabled:1;
+    u16 mode:2;
+    u16 shouldResetBlendRegisters:1;
+    u16 hardwareFadeFinishing:1;
+    u16 softwareFadeFinishingCounter:5;
+    u16 softwareFadeFinishing:1;
+    u16 objPaletteToggle:1;
+    u8 deltaY:4; // rate of change of blend coefficient
+};
+
+extern struct PaletteFadeControl gPaletteFade;
+extern u32 gPlttBufferTransferPending;
+extern u8 gPaletteDecompressionBuffer[];
+extern u16 gPlttBufferUnfaded[];
+extern u16 gPlttBufferFaded[];
+
+void LoadCompressedPalette(const void *, u16, u16);
+void LoadPalette(const void *, u16, u16);
+void FillPalette(u16, u16, u16);
+void TransferPlttBuffer(void);
+u8 UpdatePaletteFade(void);
+void ResetPaletteFade(void);
+void ReadPlttIntoBuffers(void);
+bool8 BeginNormalPaletteFade(u32, s8, u8, u8, u16);
+bool8 unref_sub_8073D3C(u32, u8, u8, u8, u16);
+void unref_sub_8073D84(u8, u32 *);
+void ResetPaletteStructByUid(u16);
+void ResetPaletteStruct(u8);
+void ResetPaletteFadeControl();
+void unref_sub_8074168(u16);
+void unref_sub_8074194(u16);
+void InvertPlttBuffer(u32);
+void TintPlttBuffer(u32, s8, s8, s8);
+void UnfadePlttBuffer(u32);
+void BeginFastPaletteFade(u8);
+void BeginHardwarePaletteFade(u8, u8, u8, u8, u8);
+void BlendPalettes(u32, u8, u16);
+void BlendPalettesUnfaded(u32, u8, u16);
+
+#endif // GUARD_PALETTE_H