snes9x/tile.cpp

/*****************************************************************************\
     Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
                This file is licensed under the Snes9x License.
   For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/

#include "snes9x.h"
#include "ppu.h"
#include "tile.h"

extern struct SLineMatrixData	LineMatrixData[240];


namespace {

	uint32	pixbit[8][16];
	uint8	hrbit_odd[256];
	uint8	hrbit_even[256];

	struct BPProgressive
	{
		enum { Pitch = 1 };
		static alwaysinline uint32 Get(uint32 StartLine) { return StartLine; }
	};

	// Interlace: Only draw every other line, so we'll redefine bpstart_t and Pitch to do so.
	// Otherwise, it's the same as Normal2x1/Hires2x1.
	struct BPInterlace
	{
		enum { Pitch = 2 };
		static alwaysinline uint32 Get(uint32 StartLine) { return StartLine * 2 + BG.InterlaceLine; }
	};

	// The 1x1 pixel plotter, for speedhacking modes.
	template<class MATH, class BPSTART>
	struct Normal1x1Base
	{
		enum { Pitch = BPSTART::Pitch };
		typedef BPSTART bpstart_t;

		static alwaysinline void Draw(uint8 N, uint8 M, uint32 Offset, uint32 OffsetInLine, uint8 Pix, uint8 Z1, uint8 Z2)
		{
			(void) OffsetInLine;
			if (Z1 > GFX.DB[Offset + N] && (M))
			{
				GFX.S[Offset + N] = MATH::Calc(GFX.ScreenColors[Pix], GFX.SubScreen[Offset + N], GFX.SubZBuffer[Offset + N]);
				GFX.DB[Offset + N] = Z2;
			}
		}
	};

	template<class MATH>
	struct Normal1x1 : public Normal1x1Base<MATH, BPProgressive> {};

	// The 2x1 pixel plotter, for normal rendering when we've used hires/interlace already this frame.
	template<class MATH, class BPSTART>
	struct Normal2x1Base
	{
		enum { Pitch = BPSTART::Pitch };
		typedef BPSTART bpstart_t;

		static alwaysinline void Draw(uint8 N, uint8 M, uint32 Offset, uint32 OffsetInLine, uint8 Pix, uint8 Z1, uint8 Z2)
		{
			(void) OffsetInLine;
			if (Z1 > GFX.DB[Offset + 2 * N] && (M))
			{
				GFX.S[Offset + 2 * N] = GFX.S[Offset + 2 * N + 1] = MATH::Calc(GFX.ScreenColors[Pix], GFX.SubScreen[Offset + 2 * N], GFX.SubZBuffer[Offset + 2 * N]);
				GFX.DB[Offset + 2 * N] = GFX.DB[Offset + 2 * N + 1] = Z2;
			}
		}
	};

	template<class MATH>
	struct Normal2x1 : public Normal2x1Base<MATH, BPProgressive> {};
	template<class MATH>
	struct Interlace : public Normal2x1Base<MATH, BPInterlace> {};

	// Hires pixel plotter, this combines the main and subscreen pixels as appropriate to render hires or pseudo-hires images.
	// Use it only on the main screen, subscreen should use Normal2x1 instead.
	// Hires math:
	//     Main pixel is mathed as normal: Main(x, y) * Sub(x, y).
	//     Sub pixel is mathed somewhat weird: Basically, for Sub(x + 1, y) we apply the same operation we applied to Main(x, y)
	//     (e.g. no math, add fixed, add1/2 subscreen) using Main(x, y) as the "corresponding subscreen pixel".
	//     Also, color window clipping clips Sub(x + 1, y) if Main(x, y) is clipped, not Main(x + 1, y).
	//     We don't know how Sub(0, y) is handled.
	template<class MATH, class BPSTART>
	struct HiresBase
	{
		enum { Pitch = BPSTART::Pitch };
		typedef BPSTART bpstart_t;

		static alwaysinline void Draw(uint8 N, uint8 M, uint32 Offset, uint32 OffsetInLine, uint8 Pix, uint8 Z1, uint8 Z2)
		{
			if (Z1 > GFX.DB[Offset + 2 * N] && (M))
			{
				GFX.S[Offset + 2 * N + 1] = MATH::Calc(GFX.ScreenColors[Pix], GFX.SubScreen[Offset + 2 * N], GFX.SubZBuffer[Offset + 2 * N]);
				if ((OffsetInLine + 2 * N ) != (SNES_WIDTH - 1) << 1)
					GFX.S[Offset + 2 * N + 2] = MATH::Calc((GFX.ClipColors ? 0 : GFX.SubScreen[Offset + 2 * N + 2]), GFX.RealScreenColors[Pix], GFX.SubZBuffer[Offset + 2 * N]);
				if ((OffsetInLine + 2 * N) == 0 || (OffsetInLine + 2 * N) == GFX.RealPPL)
					GFX.S[Offset + 2 * N] = MATH::Calc((GFX.ClipColors ? 0 : GFX.SubScreen[Offset + 2 * N]), GFX.RealScreenColors[Pix], GFX.SubZBuffer[Offset + 2 * N]);
				GFX.DB[Offset + 2 * N] = GFX.DB[Offset + 2 * N + 1] = Z2;
			}
		}
	};

	template<class MATH>
	struct Hires : public HiresBase<MATH, BPProgressive> {};
	template<class MATH>
	struct HiresInterlace : public HiresBase<MATH, BPInterlace> {};

	// Here are the tile converters, selected by S9xSelectTileConverter().
	// Really, except for the definition of DOBIT and the number of times it is called, they're all the same.

	#define DOBIT(n, i) \
		if ((pix = *(tp + (n)))) \
		{ \
			p1 |= pixbit[(i)][pix >> 4]; \
			p2 |= pixbit[(i)][pix & 0xf]; \
		}

	uint8 ConvertTile2 (uint8 *pCache, uint32 TileAddr, uint32)
	{
		uint8	*tp      = &Memory.VRAM[TileAddr];
		uint32			*p       = (uint32 *) pCache;
		uint32			non_zero = 0;
		uint8			line;

		for (line = 8; line != 0; line--, tp += 2)
		{
			uint32			p1 = 0;
			uint32			p2 = 0;
			uint8	pix;

			DOBIT( 0, 0);
			DOBIT( 1, 1);
			*p++ = p1;
			*p++ = p2;
			non_zero |= p1 | p2;
		}

		return (non_zero ? TRUE : BLANK_TILE);
	}

	uint8 ConvertTile4 (uint8 *pCache, uint32 TileAddr, uint32)
	{
		uint8	*tp      = &Memory.VRAM[TileAddr];
		uint32			*p       = (uint32 *) pCache;
		uint32			non_zero = 0;
		uint8			line;

		for (line = 8; line != 0; line--, tp += 2)
		{
			uint32			p1 = 0;
			uint32			p2 = 0;
			uint8	pix;

			DOBIT( 0, 0);
			DOBIT( 1, 1);
			DOBIT(16, 2);
			DOBIT(17, 3);
			*p++ = p1;
			*p++ = p2;
			non_zero |= p1 | p2;
		}

		return (non_zero ? TRUE : BLANK_TILE);
	}

	uint8 ConvertTile8 (uint8 *pCache, uint32 TileAddr, uint32)
	{
		uint8	*tp      = &Memory.VRAM[TileAddr];
		uint32			*p       = (uint32 *) pCache;
		uint32			non_zero = 0;
		uint8			line;

		for (line = 8; line != 0; line--, tp += 2)
		{
			uint32			p1 = 0;
			uint32			p2 = 0;
			uint8	pix;

			DOBIT( 0, 0);
			DOBIT( 1, 1);
			DOBIT(16, 2);
			DOBIT(17, 3);
			DOBIT(32, 4);
			DOBIT(33, 5);
			DOBIT(48, 6);
			DOBIT(49, 7);
			*p++ = p1;
			*p++ = p2;
			non_zero |= p1 | p2;
		}

		return (non_zero ? TRUE : BLANK_TILE);
	}

	#undef DOBIT

	#define DOBIT(n, i) \
		if ((pix = hrbit_odd[*(tp1 + (n))])) \
			p1 |= pixbit[(i)][pix]; \
		if ((pix = hrbit_odd[*(tp2 + (n))])) \
			p2 |= pixbit[(i)][pix];

	uint8 ConvertTile2h_odd (uint8 *pCache, uint32 TileAddr, uint32 Tile)
	{
		uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
		uint32			*p       = (uint32 *) pCache;
		uint32			non_zero = 0;
		uint8			line;

		if (Tile == 0x3ff)
			tp2 = tp1 - (0x3ff << 4);
		else
			tp2 = tp1 + (1 << 4);

		for (line = 8; line != 0; line--, tp1 += 2, tp2 += 2)
		{
			uint32			p1 = 0;
			uint32			p2 = 0;
			uint8	pix;

			DOBIT( 0, 0);
			DOBIT( 1, 1);
			*p++ = p1;
			*p++ = p2;
			non_zero |= p1 | p2;
		}

		return (non_zero ? TRUE : BLANK_TILE);
	}

	uint8 ConvertTile4h_odd (uint8 *pCache, uint32 TileAddr, uint32 Tile)
	{
		uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
		uint32			*p       = (uint32 *) pCache;
		uint32			non_zero = 0;
		uint8			line;

		if (Tile == 0x3ff)
			tp2 = tp1 - (0x3ff << 5);
		else
			tp2 = tp1 + (1 << 5);

		for (line = 8; line != 0; line--, tp1 += 2, tp2 += 2)
		{
			uint32			p1 = 0;
			uint32			p2 = 0;
			uint8	pix;

			DOBIT( 0, 0);
			DOBIT( 1, 1);
			DOBIT(16, 2);
			DOBIT(17, 3);
			*p++ = p1;
			*p++ = p2;
			non_zero |= p1 | p2;
		}

		return (non_zero ? TRUE : BLANK_TILE);
	}

	#undef DOBIT

	#define DOBIT(n, i) \
		if ((pix = hrbit_even[*(tp1 + (n))])) \
			p1 |= pixbit[(i)][pix]; \
		if ((pix = hrbit_even[*(tp2 + (n))])) \
			p2 |= pixbit[(i)][pix];

	uint8 ConvertTile2h_even (uint8 *pCache, uint32 TileAddr, uint32 Tile)
	{
		uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
		uint32			*p       = (uint32 *) pCache;
		uint32			non_zero = 0;
		uint8			line;

		if (Tile == 0x3ff)
			tp2 = tp1 - (0x3ff << 4);
		else
			tp2 = tp1 + (1 << 4);

		for (line = 8; line != 0; line--, tp1 += 2, tp2 += 2)
		{
			uint32			p1 = 0;
			uint32			p2 = 0;
			uint8	pix;

			DOBIT( 0, 0);
			DOBIT( 1, 1);
			*p++ = p1;
			*p++ = p2;
			non_zero |= p1 | p2;
		}

		return (non_zero ? TRUE : BLANK_TILE);
	}

	uint8 ConvertTile4h_even (uint8 *pCache, uint32 TileAddr, uint32 Tile)
	{
		uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
		uint32			*p       = (uint32 *) pCache;
		uint32			non_zero = 0;
		uint8			line;

		if (Tile == 0x3ff)
			tp2 = tp1 - (0x3ff << 5);
		else
			tp2 = tp1 + (1 << 5);

		for (line = 8; line != 0; line--, tp1 += 2, tp2 += 2)
		{
			uint32			p1 = 0;
			uint32			p2 = 0;
			uint8	pix;

			DOBIT( 0, 0);
			DOBIT( 1, 1);
			DOBIT(16, 2);
			DOBIT(17, 3);
			*p++ = p1;
			*p++ = p2;
			non_zero |= p1 | p2;
		}

		return (non_zero ? TRUE : BLANK_TILE);
	}

	#undef DOBIT


	class CachedTile
	{
	public:
		CachedTile(uint32 tile) : Tile(tile) {}

		alwaysinline void GetCachedTile()
		{
			TileAddr = BG.TileAddress + ((Tile & 0x3ff) << BG.TileShift);
			if (Tile & 0x100)
				TileAddr += BG.NameSelect;
			TileAddr &= 0xffff;
			TileNumber = TileAddr >> BG.TileShift;
			if (Tile & H_FLIP)
			{
				pCache = &BG.BufferFlip[TileNumber << 6];
				if (!BG.BufferedFlip[TileNumber])
					BG.BufferedFlip[TileNumber] = BG.ConvertTileFlip(pCache, TileAddr, Tile & 0x3ff);
			}
			else
			{
				pCache = &BG.Buffer[TileNumber << 6];
				if (!BG.Buffered[TileNumber])
					BG.Buffered[TileNumber] = BG.ConvertTile(pCache, TileAddr, Tile & 0x3ff);
			}
		}

		alwaysinline bool IsBlankTile() const
		{
			return ((Tile & H_FLIP) ? BG.BufferedFlip[TileNumber] : BG.Buffered[TileNumber]) == BLANK_TILE;
		}

		alwaysinline void SelectPalette() const
		{
			if (BG.DirectColourMode)
			{
				GFX.RealScreenColors = DirectColourMaps[(Tile >> 10) & 7];
			}
			else
				GFX.RealScreenColors = &IPPU.ScreenColors[((Tile >> BG.PaletteShift) & BG.PaletteMask) + BG.StartPalette];
			GFX.ScreenColors = GFX.ClipColors ? BlackColourMap : GFX.RealScreenColors;
		}

		alwaysinline uint8* Ptr() const
		{
			return pCache;
		}

	private:
		uint8  *pCache;
		uint32 Tile;
		uint32 TileNumber;
		uint32 TileAddr;
	};

	struct NOMATH
	{
		static alwaysinline uint16 Calc(uint16 Main, uint16 Sub, uint8 SD)
		{
			return Main;
		}
	};
	typedef NOMATH Blend_None;

	template<class Op>
	struct REGMATH
	{
		static alwaysinline uint16 Calc(uint16 Main, uint16 Sub, uint8 SD)
		{
			return Op::fn(Main, (SD & 0x20) ? Sub : GFX.FixedColour);
		}
	};
	typedef REGMATH<COLOR_ADD> Blend_Add;
	typedef REGMATH<COLOR_SUB> Blend_Sub;
	typedef REGMATH<COLOR_ADD_BRIGHTNESS> Blend_AddBrightness;

	template<class Op>
	struct MATHF1_2
	{
		static alwaysinline uint16 Calc(uint16 Main, uint16 Sub, uint8 SD)
		{
			return GFX.ClipColors ? Op::fn(Main, GFX.FixedColour) : Op::fn1_2(Main, GFX.FixedColour);
		}
	};
	typedef MATHF1_2<COLOR_ADD> Blend_AddF1_2;
	typedef MATHF1_2<COLOR_SUB> Blend_SubF1_2;

	template<class Op>
	struct MATHS1_2
	{
		static alwaysinline uint16 Calc(uint16 Main, uint16 Sub, uint8 SD)
		{
			return GFX.ClipColors ? REGMATH<Op>::Calc(Main, Sub, SD) : (SD & 0x20) ? Op::fn1_2(Main, Sub) : Op::fn(Main, GFX.FixedColour);
		}
	};
	typedef MATHS1_2<COLOR_ADD> Blend_AddS1_2;
	typedef MATHS1_2<COLOR_SUB> Blend_SubS1_2;
	typedef MATHS1_2<COLOR_ADD_BRIGHTNESS> Blend_AddS1_2Brightness;

	template<
		template<class PIXEL_> class TILE,
		template<class MATH> class PIXEL
	>
	struct Renderers
	{
		enum { Pitch = PIXEL<Blend_None>::Pitch };
		typedef typename TILE< PIXEL<Blend_None> >::call_t call_t;

		static call_t Functions[9];

	};
	template<
		template<class PIXEL_> class TILE,
		template<class MATH> class PIXEL
	>
	typename Renderers<TILE, PIXEL>::call_t Renderers<TILE, PIXEL>::Functions[9] =
	{
		TILE< PIXEL<Blend_None> >::Draw,
		TILE< PIXEL<Blend_Add> >::Draw,
		TILE< PIXEL<Blend_AddF1_2> >::Draw,
		TILE< PIXEL<Blend_AddS1_2> >::Draw,
		TILE< PIXEL<Blend_Sub> >::Draw,
		TILE< PIXEL<Blend_SubF1_2> >::Draw,
		TILE< PIXEL<Blend_SubS1_2> >::Draw,
		TILE< PIXEL<Blend_AddBrightness> >::Draw,
		TILE< PIXEL<Blend_AddS1_2Brightness> >::Draw,
	};

	// Basic routine to render an unclipped tile.
	// Input parameters:
	//     bpstart_t = either StartLine or (StartLine * 2 + BG.InterlaceLine),
	//     so interlace modes can render every other line from the tile.
	//     Pitch = 1 or 2, again so interlace can count lines properly.
	//     DRAW_PIXEL(N, M) is a routine to actually draw the pixel. N is the pixel in the row to draw,
	//     and M is a test which if false means the pixel should be skipped.
	//     Z1 is the "draw if Z1 > cur_depth".
	//     Z2 is the "cur_depth = new_depth". OBJ need the two separate.
	//     Pix is the pixel to draw.

	#define OFFSET_IN_LINE \
		uint32 OffsetInLine = Offset % GFX.RealPPL;
	#define DRAW_PIXEL(N, M) PIXEL::Draw(N, M, Offset, OffsetInLine, Pix, Z1, Z2)
	#define Z1	GFX.Z1
	#define Z2	GFX.Z2

	template<class PIXEL>
	struct DrawTile16
	{
		typedef void (*call_t)(uint32, uint32, uint32, uint32);

		enum { Pitch = PIXEL::Pitch };
		typedef typename PIXEL::bpstart_t bpstart_t;

		static void Draw(uint32 Tile, uint32 Offset, uint32 StartLine, uint32 LineCount)
		{
			CachedTile cache(Tile);
			int32	l;
			uint8	*bp, Pix;

			cache.GetCachedTile();
			if (cache.IsBlankTile())
				return;
			cache.SelectPalette();

			if (!(Tile & (V_FLIP | H_FLIP)))
			{
				bp = cache.Ptr() + bpstart_t::Get(StartLine);
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, bp += 8 * Pitch, Offset += GFX.PPL)
				{
					for (int x = 0; x < 8; x++) {
						Pix = bp[x]; DRAW_PIXEL(x, Pix);
					}
				}
			}
			else
			if (!(Tile & V_FLIP))
			{
				bp = cache.Ptr() + bpstart_t::Get(StartLine);
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, bp += 8 * Pitch, Offset += GFX.PPL)
				{
					for (int x = 0; x < 8; x++) {
						Pix = bp[7 - x]; DRAW_PIXEL(x, Pix);
					}
				}
			}
			else
			if (!(Tile & H_FLIP))
			{
				bp = cache.Ptr() + 56 - bpstart_t::Get(StartLine);
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, bp -= 8 * Pitch, Offset += GFX.PPL)
				{
					for (int x = 0; x < 8; x++) {
						Pix = bp[x]; DRAW_PIXEL(x, Pix);
					}
				}
			}
			else
			{
				bp = cache.Ptr() + 56 - bpstart_t::Get(StartLine);
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, bp -= 8 * Pitch, Offset += GFX.PPL)
				{
					for (int x = 0; x < 8; x++) {
						Pix = bp[7 - x]; DRAW_PIXEL(x, Pix);
					}
				}
			}
		}
	};

	#undef Z1
	#undef Z2

	// Basic routine to render a clipped tile. Inputs same as above.

	#define Z1	GFX.Z1
	#define Z2	GFX.Z2

	template<class PIXEL>
	struct DrawClippedTile16
	{
		typedef void (*call_t)(uint32, uint32, uint32, uint32, uint32, uint32);

		enum { Pitch = PIXEL::Pitch };
		typedef typename PIXEL::bpstart_t bpstart_t;

		static void Draw(uint32 Tile, uint32 Offset, uint32 StartPixel, uint32 Width, uint32 StartLine, uint32 LineCount)
		{
			CachedTile cache(Tile);
			int32	l;
			uint8	*bp, Pix, w;

			cache.GetCachedTile();
			if (cache.IsBlankTile())
				return;
			cache.SelectPalette();

			if (!(Tile & (V_FLIP | H_FLIP)))
			{
				bp = cache.Ptr() + bpstart_t::Get(StartLine);
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, bp += 8 * Pitch, Offset += GFX.PPL)
				{
					w = Width;
					switch (StartPixel)
					{
						case 0: Pix = bp[0]; DRAW_PIXEL(0, Pix); if (!--w) break; /* Fall through */
						case 1: Pix = bp[1]; DRAW_PIXEL(1, Pix); if (!--w) break; /* Fall through */
						case 2: Pix = bp[2]; DRAW_PIXEL(2, Pix); if (!--w) break; /* Fall through */
						case 3: Pix = bp[3]; DRAW_PIXEL(3, Pix); if (!--w) break; /* Fall through */
						case 4: Pix = bp[4]; DRAW_PIXEL(4, Pix); if (!--w) break; /* Fall through */
						case 5: Pix = bp[5]; DRAW_PIXEL(5, Pix); if (!--w) break; /* Fall through */
						case 6: Pix = bp[6]; DRAW_PIXEL(6, Pix); if (!--w) break; /* Fall through */
						case 7: Pix = bp[7]; DRAW_PIXEL(7, Pix); break;
					}
				}
			}
			else
			if (!(Tile & V_FLIP))
			{
				bp = cache.Ptr() + bpstart_t::Get(StartLine);
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, bp += 8 * Pitch, Offset += GFX.PPL)
				{
					w = Width;
					switch (StartPixel)
					{
						case 0: Pix = bp[7]; DRAW_PIXEL(0, Pix); if (!--w) break; /* Fall through */
						case 1: Pix = bp[6]; DRAW_PIXEL(1, Pix); if (!--w) break; /* Fall through */
						case 2: Pix = bp[5]; DRAW_PIXEL(2, Pix); if (!--w) break; /* Fall through */
						case 3: Pix = bp[4]; DRAW_PIXEL(3, Pix); if (!--w) break; /* Fall through */
						case 4: Pix = bp[3]; DRAW_PIXEL(4, Pix); if (!--w) break; /* Fall through */
						case 5: Pix = bp[2]; DRAW_PIXEL(5, Pix); if (!--w) break; /* Fall through */
						case 6: Pix = bp[1]; DRAW_PIXEL(6, Pix); if (!--w) break; /* Fall through */
						case 7: Pix = bp[0]; DRAW_PIXEL(7, Pix); break;
					}
				}
			}
			else
			if (!(Tile & H_FLIP))
			{
				bp = cache.Ptr() + 56 - bpstart_t::Get(StartLine);
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, bp -= 8 * Pitch, Offset += GFX.PPL)
				{
					w = Width;
					switch (StartPixel)
					{
						case 0: Pix = bp[0]; DRAW_PIXEL(0, Pix); if (!--w) break; /* Fall through */
						case 1: Pix = bp[1]; DRAW_PIXEL(1, Pix); if (!--w) break; /* Fall through */
						case 2: Pix = bp[2]; DRAW_PIXEL(2, Pix); if (!--w) break; /* Fall through */
						case 3: Pix = bp[3]; DRAW_PIXEL(3, Pix); if (!--w) break; /* Fall through */
						case 4: Pix = bp[4]; DRAW_PIXEL(4, Pix); if (!--w) break; /* Fall through */
						case 5: Pix = bp[5]; DRAW_PIXEL(5, Pix); if (!--w) break; /* Fall through */
						case 6: Pix = bp[6]; DRAW_PIXEL(6, Pix); if (!--w) break; /* Fall through */
						case 7: Pix = bp[7]; DRAW_PIXEL(7, Pix); break;
					}
				}
			}
			else
			{
				bp = cache.Ptr() + 56 - bpstart_t::Get(StartLine);
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, bp -= 8 * Pitch, Offset += GFX.PPL)
				{
					w = Width;
					switch (StartPixel)
					{
						case 0: Pix = bp[7]; DRAW_PIXEL(0, Pix); if (!--w) break; /* Fall through */
						case 1: Pix = bp[6]; DRAW_PIXEL(1, Pix); if (!--w) break; /* Fall through */
						case 2: Pix = bp[5]; DRAW_PIXEL(2, Pix); if (!--w) break; /* Fall through */
						case 3: Pix = bp[4]; DRAW_PIXEL(3, Pix); if (!--w) break; /* Fall through */
						case 4: Pix = bp[3]; DRAW_PIXEL(4, Pix); if (!--w) break; /* Fall through */
						case 5: Pix = bp[2]; DRAW_PIXEL(5, Pix); if (!--w) break; /* Fall through */
						case 6: Pix = bp[1]; DRAW_PIXEL(6, Pix); if (!--w) break; /* Fall through */
						case 7: Pix = bp[0]; DRAW_PIXEL(7, Pix); break;
					}
				}
			}
		}
	};

	#undef Z1
	#undef Z2

	// Basic routine to render a single mosaic pixel.
	// DRAW_PIXEL, bpstart_t, Z1, Z2 and Pix are the same as above, but Pitch is not used.

	#define Z1	GFX.Z1
	#define Z2	GFX.Z2

	template<class PIXEL>
	struct DrawMosaicPixel16
	{
		typedef void (*call_t)(uint32, uint32, uint32, uint32, uint32, uint32);

		typedef typename PIXEL::bpstart_t bpstart_t;

		static void Draw(uint32 Tile, uint32 Offset, uint32 StartLine, uint32 StartPixel, uint32 Width, uint32 LineCount)
		{
			CachedTile cache(Tile);
			int32	l, w;
			uint8	Pix;

			cache.GetCachedTile();
			if (cache.IsBlankTile())
				return;
			cache.SelectPalette();

			if (Tile & H_FLIP)
				StartPixel = 7 - StartPixel;

			if (Tile & V_FLIP)
				Pix = cache.Ptr()[56 - bpstart_t::Get(StartLine) + StartPixel];
			else
				Pix = cache.Ptr()[bpstart_t::Get(StartLine) + StartPixel];

			if (Pix)
			{
				OFFSET_IN_LINE;
				for (l = LineCount; l > 0; l--, Offset += GFX.PPL)
				{
					for (w = Width - 1; w >= 0; w--)
						DRAW_PIXEL(w, 1);
				}
			}
		}
	};

	#undef Z1
	#undef Z2

	// Basic routine to render the backdrop.
	// DRAW_PIXEL is the same as above, but since we're just replicating a single pixel there's no need for Pitch or bpstart_t
	// (or interlace at all, really).
	// The backdrop is always depth = 1, so Z1 = Z2 = 1. And backdrop is always color 0.

	#define Z1				1
	#define Z2				1
	#define Pix				0

	template<class PIXEL>
	struct DrawBackdrop16
	{
		typedef void (*call_t)(uint32 Offset, uint32 Left, uint32 Right);

		static void Draw(uint32 Offset, uint32 Left, uint32 Right)
		{
			uint32	l, x;

			GFX.RealScreenColors = IPPU.ScreenColors;
			GFX.ScreenColors = GFX.ClipColors ? BlackColourMap : GFX.RealScreenColors;

			OFFSET_IN_LINE;
			for (l = GFX.StartY; l <= GFX.EndY; l++, Offset += GFX.PPL)
			{
				for (x = Left; x < Right; x++)
					DRAW_PIXEL(x, 1);
			}
		}
	};

	#undef Pix
	#undef Z1
	#undef Z2
	#undef DRAW_PIXEL

	// Basic routine to render a chunk of a Mode 7 BG.
	// Mode 7 has no interlace, so bpstart_t and Pitch are unused.
	// We get some new parameters, so we can use the same DRAW_TILE to do BG1 or BG2:
	//     DCMODE tests if Direct Color should apply.
	//     BG is the BG, so we use the right clip window.
	//     MASK is 0xff or 0x7f, the 'color' portion of the pixel.
	// We define Z1/Z2 to either be constant 5 or to vary depending on the 'priority' portion of the pixel.

	#define CLIP_10_BIT_SIGNED(a)	(((a) & 0x2000) ? ((a) | ~0x3ff) : ((a) & 0x3ff))

	#define DRAW_PIXEL(N, M) PIXEL::Draw(N, M, Offset, OffsetInLine, Pix, OP::Z1(D, b), OP::Z2(D, b))

	struct DrawMode7BG1_OP
	{
		enum {
			MASK = 0xff,
			BG   = 0
		};
		static uint8 Z1(int D, uint8 b) { return D + 7; }
		static uint8 Z2(int D, uint8 b) { return D + 7; }
		static uint8 DCMODE() { return Memory.FillRAM[0x2130] & 1; }
	};
	struct DrawMode7BG2_OP
	{
		enum {
			MASK = 0x7f,
			BG   = 1
		};
		static uint8 Z1(int D, uint8 b) { return D + ((b & 0x80) ? 11 : 3); }
		static uint8 Z2(int D, uint8 b) { return D + ((b & 0x80) ? 11 : 3); }
		static uint8 DCMODE() { return 0; }
	};

	template<class PIXEL, class OP>
	struct DrawTileNormal
	{
		typedef void (*call_t)(uint32 Left, uint32 Right, int D);

		static void Draw(uint32 Left, uint32 Right, int D)
		{
			uint8	*VRAM1 = Memory.VRAM + 1;

			if (OP::DCMODE())
			{
				GFX.RealScreenColors = DirectColourMaps[0];
			}
			else
				GFX.RealScreenColors = IPPU.ScreenColors;

			GFX.ScreenColors = GFX.ClipColors ? BlackColourMap : GFX.RealScreenColors;

			int	aa, cc;
			int	startx;

			uint32	Offset = GFX.StartY * GFX.PPL;
			struct SLineMatrixData	*l = &LineMatrixData[GFX.StartY];

			OFFSET_IN_LINE;
			for (uint32 Line = GFX.StartY; Line <= GFX.EndY; Line++, Offset += GFX.PPL, l++)
			{
				int	yy, starty;

				int32	HOffset = ((int32) l->M7HOFS  << 19) >> 19;
				int32	VOffset = ((int32) l->M7VOFS  << 19) >> 19;

				int32	CentreX = ((int32) l->CentreX << 19) >> 19;
				int32	CentreY = ((int32) l->CentreY << 19) >> 19;

				if (PPU.Mode7VFlip)
					starty = 255 - (int) (Line + 1);
				else
					starty = Line + 1;

				yy = CLIP_10_BIT_SIGNED(VOffset - CentreY);

				int	BB = ((l->MatrixB * starty) & ~63) + ((l->MatrixB * yy) & ~63) + (CentreX << 8);
				int	DD = ((l->MatrixD * starty) & ~63) + ((l->MatrixD * yy) & ~63) + (CentreY << 8);

				if (PPU.Mode7HFlip)
				{
					startx = Right - 1;
					aa = -l->MatrixA;
					cc = -l->MatrixC;
				}
				else
				{
					startx = Left;
					aa = l->MatrixA;
					cc = l->MatrixC;
				}

				int	xx = CLIP_10_BIT_SIGNED(HOffset - CentreX);
				int	AA = l->MatrixA * startx + ((l->MatrixA * xx) & ~63);
				int	CC = l->MatrixC * startx + ((l->MatrixC * xx) & ~63);

				uint8	Pix;

				if (!PPU.Mode7Repeat)
				{
					for (uint32 x = Left; x < Right; x++, AA += aa, CC += cc)
					{
						int	X = ((AA + BB) >> 8) & 0x3ff;
						int	Y = ((CC + DD) >> 8) & 0x3ff;

						uint8	*TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7);
						uint8	b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1));

						Pix = b & OP::MASK; DRAW_PIXEL(x, Pix);
					}
				}
				else
				{
					for (uint32 x = Left; x < Right; x++, AA += aa, CC += cc)
					{
						int	X = ((AA + BB) >> 8);
						int	Y = ((CC + DD) >> 8);

						uint8	b;

						if (((X | Y) & ~0x3ff) == 0)
						{
							uint8	*TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7);
							b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1));
						}
						else
						if (PPU.Mode7Repeat == 3)
							b = *(VRAM1    + ((Y & 7) << 4) + ((X & 7) << 1));
						else
							continue;

						Pix = b & OP::MASK; DRAW_PIXEL(x, Pix);
					}
				}
			}
		}
	};

	template<class PIXEL>
	struct DrawMode7BG1 : public DrawTileNormal<PIXEL, DrawMode7BG1_OP> {};
	template<class PIXEL>
	struct DrawMode7BG2 : public DrawTileNormal<PIXEL, DrawMode7BG2_OP> {};

	template<class PIXEL, class OP>
	struct DrawTileMosaic
	{
		typedef void (*call_t)(uint32 Left, uint32 Right, int D);

		static void Draw(uint32 Left, uint32 Right, int D)
		{
			uint8	*VRAM1 = Memory.VRAM + 1;

			if (OP::DCMODE())
			{
				GFX.RealScreenColors = DirectColourMaps[0];
			}
			else
				GFX.RealScreenColors = IPPU.ScreenColors;

			GFX.ScreenColors = GFX.ClipColors ? BlackColourMap : GFX.RealScreenColors;

			int	aa, cc;
			int	startx, StartY = GFX.StartY;

			int		HMosaic = 1, VMosaic = 1, MosaicStart = 0;
			int32	MLeft = Left, MRight = Right;

			if (PPU.BGMosaic[0])
			{
				VMosaic = PPU.Mosaic;
				MosaicStart = ((uint32) GFX.StartY - PPU.MosaicStart) % VMosaic;
				StartY -= MosaicStart;
			}

			if (PPU.BGMosaic[OP::BG])
			{
				HMosaic = PPU.Mosaic;
				MLeft  -= MLeft  % HMosaic;
				MRight += HMosaic - 1;
				MRight -= MRight % HMosaic;
			}

			uint32	Offset = StartY * GFX.PPL;
			struct SLineMatrixData	*l = &LineMatrixData[StartY];

			OFFSET_IN_LINE;
			for (uint32 Line = StartY; Line <= GFX.EndY; Line += VMosaic, Offset += VMosaic * GFX.PPL, l += VMosaic)
			{
				if (Line + VMosaic > GFX.EndY)
					VMosaic = GFX.EndY - Line + 1;

				int	yy, starty;

				int32	HOffset = ((int32) l->M7HOFS  << 19) >> 19;
				int32	VOffset = ((int32) l->M7VOFS  << 19) >> 19;

				int32	CentreX = ((int32) l->CentreX << 19) >> 19;
				int32	CentreY = ((int32) l->CentreY << 19) >> 19;

				if (PPU.Mode7VFlip)
					starty = 255 - (int) (Line + 1);
				else
					starty = Line + 1;

				yy = CLIP_10_BIT_SIGNED(VOffset - CentreY);

				int	BB = ((l->MatrixB * starty) & ~63) + ((l->MatrixB * yy) & ~63) + (CentreX << 8);
				int	DD = ((l->MatrixD * starty) & ~63) + ((l->MatrixD * yy) & ~63) + (CentreY << 8);

				if (PPU.Mode7HFlip)
				{
					startx = MRight - 1;
					aa = -l->MatrixA;
					cc = -l->MatrixC;
				}
				else
				{
					startx = MLeft;
					aa = l->MatrixA;
					cc = l->MatrixC;
				}

				int	xx = CLIP_10_BIT_SIGNED(HOffset - CentreX);
				int	AA = l->MatrixA * startx + ((l->MatrixA * xx) & ~63);
				int	CC = l->MatrixC * startx + ((l->MatrixC * xx) & ~63);

				uint8	Pix;
				uint8	ctr = 1;

				if (!PPU.Mode7Repeat)
				{
					for (int32 x = MLeft; x < MRight; x++, AA += aa, CC += cc)
					{
						if (--ctr)
							continue;
						ctr = HMosaic;

						int	X = ((AA + BB) >> 8) & 0x3ff;
						int	Y = ((CC + DD) >> 8) & 0x3ff;

						uint8	*TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7);
						uint8	b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1));

						if ((Pix = (b & OP::MASK)))
						{
							for (int32 h = MosaicStart; h < VMosaic; h++)
							{
								for (int32 w = x + HMosaic - 1; w >= x; w--)
									DRAW_PIXEL(w + h * GFX.PPL, (w >= (int32) Left && w < (int32) Right));
							}
						}
					}
				}
				else
				{
					for (int32 x = MLeft; x < MRight; x++, AA += aa, CC += cc)
					{
						if (--ctr)
							continue;
						ctr = HMosaic;

						int	X = ((AA + BB) >> 8);
						int	Y = ((CC + DD) >> 8);

						uint8	b;

						if (((X | Y) & ~0x3ff) == 0)
						{
							uint8	*TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7);
							b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1));
						}
						else
						if (PPU.Mode7Repeat == 3)
							b = *(VRAM1    + ((Y & 7) << 4) + ((X & 7) << 1));
						else
							continue;

						if ((Pix = (b & OP::MASK)))
						{
							for (int32 h = MosaicStart; h < VMosaic; h++)
							{
								for (int32 w = x + HMosaic - 1; w >= x; w--)
									DRAW_PIXEL(w + h * GFX.PPL, (w >= (int32) Left && w < (int32) Right));
							}
						}
					}
				}

				MosaicStart = 0;
			}
		}
	};

	template<class PIXEL>
	struct DrawMode7MosaicBG1 : public DrawTileMosaic<PIXEL, DrawMode7BG1_OP> {};
	template<class PIXEL>
	struct DrawMode7MosaicBG2 : public DrawTileMosaic<PIXEL, DrawMode7BG2_OP> {};


	#undef DRAW_PIXEL

} // anonymous namespace


void S9xInitTileRenderer (void)
{
	int	i;

	for (i = 0; i < 16; i++)
	{
		uint32	b = 0;

	#ifdef LSB_FIRST
		if (i & 8)
			b |= 1;
		if (i & 4)
			b |= 1 << 8;
		if (i & 2)
			b |= 1 << 16;
		if (i & 1)
			b |= 1 << 24;
	#else
		if (i & 8)
			b |= 1 << 24;
		if (i & 4)
			b |= 1 << 16;
		if (i & 2)
			b |= 1 << 8;
		if (i & 1)
			b |= 1;
	#endif

		for (uint8 bitshift = 0; bitshift < 8; bitshift++)
			pixbit[bitshift][i] = b << bitshift;
	}

	for (i = 0; i < 256; i++)
	{
		uint8	m = 0;
		uint8	s = 0;

		if (i & 0x80)
			s |= 8;
		if (i & 0x40)
			m |= 8;
		if (i & 0x20)
			s |= 4;
		if (i & 0x10)
			m |= 4;
		if (i & 0x08)
			s |= 2;
		if (i & 0x04)
			m |= 2;
		if (i & 0x02)
			s |= 1;
		if (i & 0x01)
			m |= 1;

		hrbit_odd[i]  = m;
		hrbit_even[i] = s;
	}
}

// Functions to select which converter and renderer to use.

void S9xSelectTileRenderers (int BGMode, bool8 sub, bool8 obj)
{
	void	(**DT)		(uint32, uint32, uint32, uint32);
	void	(**DCT)		(uint32, uint32, uint32, uint32, uint32, uint32);
	void	(**DMP)		(uint32, uint32, uint32, uint32, uint32, uint32);
	void	(**DB)		(uint32, uint32, uint32);
	void	(**DM7BG1)	(uint32, uint32, int);
	void	(**DM7BG2)	(uint32, uint32, int);
	bool8	M7M1, M7M2;

	M7M1 = PPU.BGMosaic[0] && PPU.Mosaic > 1;
	M7M2 = PPU.BGMosaic[1] && PPU.Mosaic > 1;

	bool8 interlace = obj ? FALSE : IPPU.Interlace;
	bool8 hires = !sub && (BGMode == 5 || BGMode == 6 || IPPU.PseudoHires);

	if (!IPPU.DoubleWidthPixels)	// normal width
	{
		DT     = Renderers<DrawTile16, Normal1x1>::Functions;
		DCT    = Renderers<DrawClippedTile16, Normal1x1>::Functions;
		DMP    = Renderers<DrawMosaicPixel16, Normal1x1>::Functions;
		DB     = Renderers<DrawBackdrop16, Normal1x1>::Functions;
		DM7BG1 = M7M1 ? Renderers<DrawMode7MosaicBG1, Normal1x1>::Functions : Renderers<DrawMode7BG1, Normal1x1>::Functions;
		DM7BG2 = M7M2 ? Renderers<DrawMode7MosaicBG2, Normal1x1>::Functions : Renderers<DrawMode7BG2, Normal1x1>::Functions;
		GFX.LinesPerTile = 8;
	}
	else if(hires)					// hires double width
	{
		if (interlace)
		{
			DT     = Renderers<DrawTile16, HiresInterlace>::Functions;
			DCT    = Renderers<DrawClippedTile16, HiresInterlace>::Functions;
			DMP    = Renderers<DrawMosaicPixel16, HiresInterlace>::Functions;
			DB     = Renderers<DrawBackdrop16, Hires>::Functions;
			DM7BG1 = M7M1 ? Renderers<DrawMode7MosaicBG1, Hires>::Functions : Renderers<DrawMode7BG1, Hires>::Functions;
			DM7BG2 = M7M2 ? Renderers<DrawMode7MosaicBG2, Hires>::Functions : Renderers<DrawMode7BG2, Hires>::Functions;
			GFX.LinesPerTile = 4;
		}
		else
		{
			DT     = Renderers<DrawTile16, Hires>::Functions;
			DCT    = Renderers<DrawClippedTile16, Hires>::Functions;
			DMP    = Renderers<DrawMosaicPixel16, Hires>::Functions;
			DB     = Renderers<DrawBackdrop16, Hires>::Functions;
			DM7BG1 = M7M1 ? Renderers<DrawMode7MosaicBG1, Hires>::Functions : Renderers<DrawMode7BG1, Hires>::Functions;
			DM7BG2 = M7M2 ? Renderers<DrawMode7MosaicBG2, Hires>::Functions : Renderers<DrawMode7BG2, Hires>::Functions;
			GFX.LinesPerTile = 8;
		}
	}
	else							// normal double width
	{
		if (interlace)
		{
			DT     = Renderers<DrawTile16, Interlace>::Functions;
			DCT    = Renderers<DrawClippedTile16, Interlace>::Functions;
			DMP    = Renderers<DrawMosaicPixel16, Interlace>::Functions;
			DB     = Renderers<DrawBackdrop16, Normal2x1>::Functions;
			DM7BG1 = M7M1 ? Renderers<DrawMode7MosaicBG1, Normal2x1>::Functions : Renderers<DrawMode7BG1, Normal2x1>::Functions;
			DM7BG2 = M7M2 ? Renderers<DrawMode7MosaicBG2, Normal2x1>::Functions : Renderers<DrawMode7BG2, Normal2x1>::Functions;
			GFX.LinesPerTile = 4;
		}
		else
		{
			DT     = Renderers<DrawTile16, Normal2x1>::Functions;
			DCT    = Renderers<DrawClippedTile16, Normal2x1>::Functions;
			DMP    = Renderers<DrawMosaicPixel16, Normal2x1>::Functions;
			DB     = Renderers<DrawBackdrop16, Normal2x1>::Functions;
			DM7BG1 = M7M1 ? Renderers<DrawMode7MosaicBG1, Normal2x1>::Functions : Renderers<DrawMode7BG1, Normal2x1>::Functions;
			DM7BG2 = M7M2 ? Renderers<DrawMode7MosaicBG2, Normal2x1>::Functions : Renderers<DrawMode7BG2, Normal2x1>::Functions;
			GFX.LinesPerTile = 8;
		}
	}

	GFX.DrawTileNomath        = DT[0];
	GFX.DrawClippedTileNomath = DCT[0];
	GFX.DrawMosaicPixelNomath = DMP[0];
	GFX.DrawBackdropNomath    = DB[0];
	GFX.DrawMode7BG1Nomath    = DM7BG1[0];
	GFX.DrawMode7BG2Nomath    = DM7BG2[0];

	int	i;

	if (!Settings.Transparency)
		i = 0;
	else
	{
		i = (Memory.FillRAM[0x2131] & 0x80) ? 4 : 1;
		if (Memory.FillRAM[0x2131] & 0x40)
		{
			i++;
			if (Memory.FillRAM[0x2130] & 2)
				i++;
		}
		if (IPPU.MaxBrightness != 0xf)
		{
			if (i == 1)
				i = 7;
			else if (i == 3)
				i = 8;
		}

	}

	GFX.DrawTileMath        = DT[i];
	GFX.DrawClippedTileMath = DCT[i];
	GFX.DrawMosaicPixelMath = DMP[i];
	GFX.DrawBackdropMath    = DB[i];
	GFX.DrawMode7BG1Math    = DM7BG1[i];
	GFX.DrawMode7BG2Math    = DM7BG2[i];
}

void S9xSelectTileConverter (int depth, bool8 hires, bool8 sub, bool8 mosaic)
{
	switch (depth)
	{
		case 8:
			BG.ConvertTile      = BG.ConvertTileFlip = ConvertTile8;
			BG.Buffer           = BG.BufferFlip      = IPPU.TileCache[TILE_8BIT];
			BG.Buffered         = BG.BufferedFlip    = IPPU.TileCached[TILE_8BIT];
			BG.TileShift        = 6;
			BG.PaletteShift     = 0;
			BG.PaletteMask      = 0;
			BG.DirectColourMode = Memory.FillRAM[0x2130] & 1;

			break;

		case 4:
			if (hires)
			{
				if (sub || mosaic)
				{
					BG.ConvertTile     = ConvertTile4h_even;
					BG.Buffer          = IPPU.TileCache[TILE_4BIT_EVEN];
					BG.Buffered        = IPPU.TileCached[TILE_4BIT_EVEN];
					BG.ConvertTileFlip = ConvertTile4h_odd;
					BG.BufferFlip      = IPPU.TileCache[TILE_4BIT_ODD];
					BG.BufferedFlip    = IPPU.TileCached[TILE_4BIT_ODD];
				}
				else
				{
					BG.ConvertTile     = ConvertTile4h_odd;
					BG.Buffer          = IPPU.TileCache[TILE_4BIT_ODD];
					BG.Buffered        = IPPU.TileCached[TILE_4BIT_ODD];
					BG.ConvertTileFlip = ConvertTile4h_even;
					BG.BufferFlip      = IPPU.TileCache[TILE_4BIT_EVEN];
					BG.BufferedFlip    = IPPU.TileCached[TILE_4BIT_EVEN];
				}
			}
			else
			{
				BG.ConvertTile = BG.ConvertTileFlip = ConvertTile4;
				BG.Buffer      = BG.BufferFlip      = IPPU.TileCache[TILE_4BIT];
				BG.Buffered    = BG.BufferedFlip    = IPPU.TileCached[TILE_4BIT];
			}

			BG.TileShift        = 5;
			BG.PaletteShift     = 10 - 4;
			BG.PaletteMask      = 7 << 4;
			BG.DirectColourMode = FALSE;

			break;

		case 2:
			if (hires)
			{
				if (sub || mosaic)
				{
					BG.ConvertTile     = ConvertTile2h_even;
					BG.Buffer          = IPPU.TileCache[TILE_2BIT_EVEN];
					BG.Buffered        = IPPU.TileCached[TILE_2BIT_EVEN];
					BG.ConvertTileFlip = ConvertTile2h_odd;
					BG.BufferFlip      = IPPU.TileCache[TILE_2BIT_ODD];
					BG.BufferedFlip    = IPPU.TileCached[TILE_2BIT_ODD];
				}
				else
				{
					BG.ConvertTile     = ConvertTile2h_odd;
					BG.Buffer          = IPPU.TileCache[TILE_2BIT_ODD];
					BG.Buffered        = IPPU.TileCached[TILE_2BIT_ODD];
					BG.ConvertTileFlip = ConvertTile2h_even;
					BG.BufferFlip      = IPPU.TileCache[TILE_2BIT_EVEN];
					BG.BufferedFlip    = IPPU.TileCached[TILE_2BIT_EVEN];
				}
			}
			else
			{
				BG.ConvertTile = BG.ConvertTileFlip = ConvertTile2;
				BG.Buffer      = BG.BufferFlip      = IPPU.TileCache[TILE_2BIT];
				BG.Buffered    = BG.BufferedFlip    = IPPU.TileCached[TILE_2BIT];
			}

			BG.TileShift        = 4;
			BG.PaletteShift     = 10 - 2;
			BG.PaletteMask      = 7 << 2;
			BG.DirectColourMode = FALSE;

			break;
	}
}