Merge branch 'master' of https://github.com/pret/pokeemerald into field_map_obj_helpers

1 files changed, 47 insertions, 0 deletions

diff --git a/include/scanline_effect.h b/include/scanline_effect.h
new file mode 100644
index 000000000..54dfe17bd
--- /dev/null
+++ b/include/scanline_effect.h
@@ -0,0 +1,47 @@
+#ifndef GUARD_SCANLINE_EFFECT_H
+#define GUARD_SCANLINE_EFFECT_H
+
+// DMA control value to ransfer a single 16-bit value at HBlank
+#define SCANLINE_EFFECT_DMACNT_16BIT (((DMA_ENABLE | DMA_START_HBLANK | DMA_REPEAT | DMA_SRC_INC | DMA_DEST_INC | DMA_16BIT | DMA_DEST_RELOAD) << 16) | 1)
+
+#define SCANLINE_EFFECT_REG_BG0HOFS (REG_ADDR_BG0HOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG0VOFS (REG_ADDR_BG0VOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG1HOFS (REG_ADDR_BG1HOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG1VOFS (REG_ADDR_BG1VOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG2HOFS (REG_ADDR_BG2HOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG2VOFS (REG_ADDR_BG2VOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG3HOFS (REG_ADDR_BG3HOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG3VOFS (REG_ADDR_BG3VOFS - REG_ADDR_BG0HOFS)
+
+struct ScanlineEffectParams
+{
+    volatile void *dmaDest;
+    u32 dmaControl;
+    u8 initState;
+    u8 unused9;
+};
+
+struct ScanlineEffect
+{
+    void *dmaSrcBuffers[2];
+    volatile void *dmaDest;
+    u32 dmaControl;
+    void (*setFirstScanlineReg)(void);
+    u8 srcBuffer;
+    u8 state;
+    u8 unused16;
+    u8 unused17;
+    u8 waveTaskId;
+};
+
+extern struct ScanlineEffect gScanlineEffect;
+
+extern u16 gScanlineEffectRegBuffers[][0x3C0];
+
+void ScanlineEffect_Stop(void);
+void ScanlineEffect_Clear(void);
+void ScanlineEffect_SetParams(struct ScanlineEffectParams);
+void ScanlineEffect_InitHBlankDmaTransfer(void);
+u8 ScanlineEffect_InitWave(u8 startLine, u8 endLine, u8 frequency, u8 amplitude, u8 delayInterval, u8 regOffset, bool8 a7);
+
+#endif // GUARD_SCANLINE_EFFECT_H