start moving everything to C

1 files changed, 1065 insertions, 0 deletions

diff --git a/source/tile.c b/source/tile.c
new file mode 100644
index 0000000..3dcab74
--- /dev/null
+++ b/source/tile.c
@@ -0,0 +1,1065 @@
+/*******************************************************************************
+  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
+ 
+  (c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
+                            Jerremy Koot (jkoot@snes9x.com)
+
+  (c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)
+
+  (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
+                            funkyass (funkyass@spam.shaw.ca),
+                            Joel Yliluoma (http://iki.fi/bisqwit/)
+                            Kris Bleakley (codeviolation@hotmail.com),
+                            Matthew Kendora,
+                            Nach (n-a-c-h@users.sourceforge.net),
+                            Peter Bortas (peter@bortas.org) and
+                            zones (kasumitokoduck@yahoo.com)
+
+  C4 x86 assembler and some C emulation code
+  (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
+                            _Demo_ (_demo_@zsnes.com), and Nach
+
+  C4 C++ code
+  (c) Copyright 2003 Brad Jorsch
+
+  DSP-1 emulator code
+  (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
+                            John Weidman, neviksti (neviksti@hotmail.com),
+                            Kris Bleakley, Andreas Naive
+
+  DSP-2 emulator code
+  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
+                     Lord Nightmare (lord_nightmare@users.sourceforge.net
+
+  OBC1 emulator code
+  (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
+                            Kris Bleakley
+  Ported from x86 assembler to C by sanmaiwashi
+
+  SPC7110 and RTC C++ emulator code
+  (c) Copyright 2002 Matthew Kendora with research by
+                     zsKnight, John Weidman, and Dark Force
+
+  S-DD1 C emulator code
+  (c) Copyright 2003 Brad Jorsch with research by
+                     Andreas Naive and John Weidman
+ 
+  S-RTC C emulator code
+  (c) Copyright 2001 John Weidman
+  
+  ST010 C++ emulator code
+  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
+
+  Super FX x86 assembler emulator code 
+  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 
+
+  Super FX C emulator code 
+  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
+
+
+  SH assembler code partly based on x86 assembler code
+  (c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se) 
+
+ 
+  Specific ports contains the works of other authors. See headers in
+  individual files.
+ 
+  Snes9x homepage: http://www.snes9x.com
+ 
+  Permission to use, copy, modify and distribute Snes9x in both binary and
+  source form, for non-commercial purposes, is hereby granted without fee,
+  providing that this license information and copyright notice appear with
+  all copies and any derived work.
+ 
+  This software is provided 'as-is', without any express or implied
+  warranty. In no event shall the authors be held liable for any damages
+  arising from the use of this software.
+ 
+  Snes9x is freeware for PERSONAL USE only. Commercial users should
+  seek permission of the copyright holders first. Commercial use includes
+  charging money for Snes9x or software derived from Snes9x.
+ 
+  The copyright holders request that bug fixes and improvements to the code
+  should be forwarded to them so everyone can benefit from the modifications
+  in future versions.
+ 
+  Super NES and Super Nintendo Entertainment System are trademarks of
+  Nintendo Co., Limited and its subsidiary companies.
+*******************************************************************************/
+#include "snes9x.h"
+
+#include "memmap.h"
+#include "ppu.h"
+#include "display.h"
+#include "gfx.h"
+#include "tile.h"
+
+extern uint32 HeadMask [4];
+extern uint32 TailMask [5];
+
+static uint8 ConvertTile (uint8 *pCache, uint32 TileAddr)
+{
+    register uint8 *tp = &Memory.VRAM[TileAddr];
+    uint32 *p = (uint32 *) pCache;
+    uint32 non_zero = 0;
+    uint8 line;
+
+    switch (BG.BitShift)
+    {
+    case 8:
+	for (line = 8; line != 0; line--, tp += 2)
+	{
+	    uint32 p1 = 0;
+	    uint32 p2 = 0;
+	    register uint8 pix;
+
+	    if ((pix = *(tp + 0)))
+	    {
+		p1 |= odd_high[0][pix >> 4];
+		p2 |= odd_low[0][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 1)))
+	    {
+		p1 |= even_high[0][pix >> 4];
+		p2 |= even_low[0][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 16)))
+	    {
+		p1 |= odd_high[1][pix >> 4];
+		p2 |= odd_low[1][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 17)))
+	    {
+		p1 |= even_high[1][pix >> 4];
+		p2 |= even_low[1][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 32)))
+	    {
+		p1 |= odd_high[2][pix >> 4];
+		p2 |= odd_low[2][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 33)))
+	    {
+		p1 |= even_high[2][pix >> 4];
+		p2 |= even_low[2][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 48)))
+	    {
+		p1 |= odd_high[3][pix >> 4];
+		p2 |= odd_low[3][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 49)))
+	    {
+		p1 |= even_high[3][pix >> 4];
+		p2 |= even_low[3][pix & 0xf];
+	    }
+	    *p++ = p1;
+	    *p++ = p2;
+	    non_zero |= p1 | p2;
+	}
+	break;
+
+    case 4:
+	for (line = 8; line != 0; line--, tp += 2)
+	{
+	    uint32 p1 = 0;
+	    uint32 p2 = 0;
+	    register uint8 pix;
+	    if ((pix = *(tp + 0)))
+	    {
+		p1 |= odd_high[0][pix >> 4];
+		p2 |= odd_low[0][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 1)))
+	    {
+		p1 |= even_high[0][pix >> 4];
+		p2 |= even_low[0][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 16)))
+	    {
+		p1 |= odd_high[1][pix >> 4];
+		p2 |= odd_low[1][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 17)))
+	    {
+		p1 |= even_high[1][pix >> 4];
+		p2 |= even_low[1][pix & 0xf];
+	    }
+	    *p++ = p1;
+	    *p++ = p2;
+	    non_zero |= p1 | p2;
+	}
+	break;
+
+    case 2:
+	for (line = 8; line != 0; line--, tp += 2)
+	{
+	    uint32 p1 = 0;
+	    uint32 p2 = 0;
+	    register uint8 pix;
+	    if ((pix = *(tp + 0)))
+	    {
+		p1 |= odd_high[0][pix >> 4];
+		p2 |= odd_low[0][pix & 0xf];
+	    }
+	    if ((pix = *(tp + 1)))
+	    {
+		p1 |= even_high[0][pix >> 4];
+		p2 |= even_low[0][pix & 0xf];
+	    }
+	    *p++ = p1;
+	    *p++ = p2;
+	    non_zero |= p1 | p2;
+	}
+	break;
+    }
+    return (non_zero ? TRUE : BLANK_TILE);
+}
+#define PLOT_PIXEL(screen, pixel) (pixel)
+
+
+static void WRITE_4PIXELS16 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+   uint16 *Screen = (uint16 *) GFX.S + Offset;
+   uint8  *Depth = GFX.DB + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			Screen [N] = ScreenColors [Pixel];
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPED (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.DB + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			Screen [N] = ScreenColors [Pixel];
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_HALFWIDTH (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.DB + Offset;
+
+	for (uint8 N = 0; N < 4; N += 2)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			Screen [N >> 1] = ScreenColors [Pixel];
+			Depth [N >> 1] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPED_HALFWIDTH (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.DB + Offset;
+
+	for (uint8 N = 0; N < 4; N += 2)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[2 - N]))
+		{
+			Screen [N >> 1] = ScreenColors [Pixel];
+			Depth [N >> 1] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16x2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.DB + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			Screen [N * 2] = Screen [N * 2 + 1] = ScreenColors [Pixel];
+			Depth [N * 2] = Depth [N * 2 + 1] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPEDx2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.DB + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			Screen [N * 2] = Screen [N * 2 + 1] = ScreenColors [Pixel];
+			Depth [N * 2] = Depth [N * 2 + 1] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16x2x2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.DB + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			Screen [N * 2] = Screen [N * 2 + 1] = Screen [(GFX.RealPitch >> 1) + N * 2] = Screen [(GFX.RealPitch >> 1) + N * 2 + 1] = ScreenColors [Pixel];
+			Depth [N * 2] = Depth [N * 2 + 1] = Depth [(GFX.RealPitch >> 1) + N * 2] = Depth [(GFX.RealPitch >> 1) + N * 2 + 1] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPEDx2x2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.DB + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			Screen [N * 2] = Screen [N * 2 + 1] = Screen [(GFX.RealPitch >> 1) + N * 2] = Screen [(GFX.RealPitch >> 1) + N * 2 + 1] = ScreenColors [Pixel];
+			Depth [N * 2] = Depth [N * 2 + 1] = Depth [(GFX.RealPitch >> 1) + N * 2] = Depth [(GFX.RealPitch >> 1) + N * 2 + 1] = GFX.Z2;
+		}
+	}
+}
+
+void DrawTile16 (uint32 Tile, int32 Offset, uint32 StartLine,
+	         uint32 LineCount)
+{
+	TILE_PREAMBLE
+	register uint8 *bp;
+
+	RENDER_TILE(WRITE_4PIXELS16, WRITE_4PIXELS16_FLIPPED, 4)
+}
+
+void DrawClippedTile16 (uint32 Tile, int32 Offset,
+			uint32 StartPixel, uint32 Width,
+			uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16, WRITE_4PIXELS16_FLIPPED, 4)
+}
+
+void DrawTile16HalfWidth (uint32 Tile, int32 Offset, uint32 StartLine,
+		   uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    RENDER_TILE(WRITE_4PIXELS16_HALFWIDTH, WRITE_4PIXELS16_FLIPPED_HALFWIDTH, 2)
+}
+
+void DrawClippedTile16HalfWidth (uint32 Tile, int32 Offset,
+			uint32 StartPixel, uint32 Width,
+			uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_HALFWIDTH, WRITE_4PIXELS16_FLIPPED_HALFWIDTH, 2)
+}
+
+void DrawTile16x2 (uint32 Tile, int32 Offset, uint32 StartLine,
+		   uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    RENDER_TILE(WRITE_4PIXELS16x2, WRITE_4PIXELS16_FLIPPEDx2, 8)
+}
+
+void DrawClippedTile16x2 (uint32 Tile, int32 Offset,
+			  uint32 StartPixel, uint32 Width,
+			  uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16x2, WRITE_4PIXELS16_FLIPPEDx2, 8)
+}
+
+void DrawTile16x2x2 (uint32 Tile, int32 Offset, uint32 StartLine,
+		     uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    RENDER_TILE(WRITE_4PIXELS16x2x2, WRITE_4PIXELS16_FLIPPEDx2x2, 8)
+}
+
+void DrawClippedTile16x2x2 (uint32 Tile, int32 Offset,
+			    uint32 StartPixel, uint32 Width,
+			    uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16x2x2, WRITE_4PIXELS16_FLIPPEDx2x2, 8)
+}
+
+void DrawLargePixel16 (uint32 Tile, int32 Offset,
+		       uint32 StartPixel, uint32 Pixels,
+		       uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+
+    register uint16 *sp = (uint16 *) GFX.S + Offset;
+    uint8  *Depth = GFX.DB + Offset;
+    uint16 pixel;
+
+    RENDER_TILE_LARGE (ScreenColors [pixel], PLOT_PIXEL)
+}
+
+void DrawLargePixel16HalfWidth (uint32 Tile, int32 Offset,
+		       uint32 StartPixel, uint32 Pixels,
+		       uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+
+    register uint16 *sp = (uint16 *) GFX.S + Offset;
+    uint8  *Depth = GFX.DB + Offset;
+    uint16 pixel;
+
+    RENDER_TILE_LARGE_HALFWIDTH (ScreenColors [pixel], PLOT_PIXEL)
+}
+
+static void WRITE_4PIXELS16_ADD (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+      {
+			switch (SubDepth [N])
+			{
+			case 0:
+				Screen [N] = ScreenColors [Pixel];
+				break;
+			case 1:
+				Screen [N] = COLOR_ADD (ScreenColors [Pixel], GFX.FixedColour);
+				break;
+			default:
+				Screen [N] = COLOR_ADD (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+				break;
+			}
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPED_ADD (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			switch (SubDepth [N])
+			{
+			case 0:
+				Screen [N] = ScreenColors [Pixel];
+				break;
+			case 1:
+				Screen [N] = COLOR_ADD (ScreenColors [Pixel], GFX.FixedColour);
+				break;
+			default:
+				Screen [N] = COLOR_ADD (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+				break;
+			}
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_ADD1_2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			switch (SubDepth [N])
+			{
+			case 0:
+				Screen [N] = ScreenColors [Pixel];
+				break;
+			case 1:
+				Screen [N] = COLOR_ADD (ScreenColors [Pixel], GFX.FixedColour);
+				break;
+			default:
+				Screen [N] = (uint16) (COLOR_ADD1_2 (ScreenColors [Pixel], Screen [GFX.Delta + N]));
+				break;
+			}
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPED_ADD1_2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			switch (SubDepth [N])
+			{
+			case 0:
+				Screen [N] = ScreenColors [Pixel];
+				break;
+			case 1:
+				Screen [N] = COLOR_ADD (ScreenColors [Pixel], GFX.FixedColour);
+				break;
+			default:
+				Screen [N] = (uint16) (COLOR_ADD1_2 (ScreenColors [Pixel], Screen [GFX.Delta + N]));
+				break;
+			}
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_SUB (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			switch (SubDepth [N])
+			{
+			case 0:
+				Screen [N] = ScreenColors [Pixel];
+				break;
+			case 1:
+				Screen [N] = (uint16) COLOR_SUB (ScreenColors [Pixel], GFX.FixedColour);
+				break;
+			default:
+				Screen [N] = (uint16) COLOR_SUB (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+				break;
+			}
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPED_SUB (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			switch (SubDepth [N])
+			{
+			case 0:
+				Screen [N] = ScreenColors [Pixel];
+				break;
+			case 1:
+				Screen [N] = (uint16) COLOR_SUB (ScreenColors [Pixel], GFX.FixedColour);
+				break;
+			default:
+				Screen [N] = (uint16) COLOR_SUB (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+				break;
+			}
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_SUB1_2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			switch (SubDepth [N])
+			{
+			case 0:
+				Screen [N] = ScreenColors [Pixel];
+				break;
+			case 1:
+				Screen [N] = (uint16) COLOR_SUB (ScreenColors [Pixel], GFX.FixedColour);
+				break;
+			default:
+				Screen [N] = (uint16) COLOR_SUB1_2 (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+				break;
+			}
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPED_SUB1_2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint8 N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			switch (SubDepth [N])
+			{
+			case 0:
+				Screen [N] = ScreenColors [Pixel];
+				break;
+			case 1:
+				Screen [N] = (uint16) COLOR_SUB (ScreenColors [Pixel], GFX.FixedColour);
+				break;
+			default:
+				Screen [N] = (uint16) COLOR_SUB1_2 (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+				break;
+			}
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+
+void DrawTile16Add (uint32 Tile, int32 Offset, uint32 StartLine,
+		    uint32 LineCount)
+{
+	TILE_PREAMBLE
+	register uint8 *bp;
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+    switch (Tile & (V_FLIP | H_FLIP))
+    {
+    case 0:
+	bp = pCache + StartLine;
+	for (l = LineCount; l != 0; l--, bp += 8, Screen += GFX.PPL, Depth += GFX.PPL, SubDepth += GFX.PPL)
+	{
+		for (uint8 N = 0; N < 8; N++)
+		{
+			if (GFX.Z1 > Depth [N] && (Pixel = bp[N]))
+			{
+				switch (SubDepth [N])
+				{
+				case 0:
+					Screen [N] = ScreenColors [Pixel];
+					break;
+				case 1:
+					Screen [N] = COLOR_ADD (ScreenColors [Pixel], GFX.FixedColour);
+					break;
+				default:
+					Screen [N] = COLOR_ADD (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+					break;
+				}
+				Depth [N] = GFX.Z2;
+			}
+		}
+	}
+        break;
+    case H_FLIP:
+	bp = pCache + StartLine;
+	for (l = LineCount; l != 0; l--, bp += 8, Screen += GFX.PPL, Depth += GFX.PPL, SubDepth += GFX.PPL)
+	{
+		for (uint8 N = 0; N < 8; N++)
+		{
+			if (GFX.Z1 > Depth [N] && (Pixel = bp[7 - N]))
+			{
+				switch (SubDepth [N])
+				{
+				case 0:
+					Screen [N] = ScreenColors [Pixel];
+					break;
+				case 1:
+					Screen [N] = COLOR_ADD (ScreenColors [Pixel], GFX.FixedColour);
+					break;
+				default:
+					Screen [N] = COLOR_ADD (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+					break;
+				}
+				Depth [N] = GFX.Z2;
+			}
+		}
+	}
+        break;
+    case H_FLIP | V_FLIP:
+	bp = pCache + 56 - StartLine;
+	for (l = LineCount; l != 0; l--, bp -= 8, Screen += GFX.PPL, Depth += GFX.PPL, SubDepth += GFX.PPL)
+	{
+		for (uint8 N = 0; N < 8; N++)
+		{
+			if (GFX.Z1 > Depth [N] && (Pixel = bp[7 - N]))
+			{
+				switch (SubDepth [N])
+				{
+				case 0:
+					Screen [N] = ScreenColors [Pixel];
+					break;
+				case 1:
+					Screen [N] = COLOR_ADD (ScreenColors [Pixel], GFX.FixedColour);
+					break;
+				default:
+					Screen [N] = COLOR_ADD (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+					break;
+				}
+				Depth [N] = GFX.Z2;
+			}
+		}
+	}
+        break;
+    case V_FLIP:
+	bp = pCache + 56 - StartLine;
+	for (l = LineCount; l != 0; l--, bp -= 8, Screen += GFX.PPL, Depth += GFX.PPL, SubDepth += GFX.PPL)
+	{
+		for (uint8 N = 0; N < 8; N++)
+		{
+			if (GFX.Z1 > Depth [N] && (Pixel = bp[N]))
+			{
+				switch (SubDepth [N])
+				{
+				case 0:
+					Screen [N] = ScreenColors [Pixel];
+					break;
+				case 1:
+					Screen [N] = COLOR_ADD (ScreenColors [Pixel], GFX.FixedColour);
+					break;
+				default:
+					Screen [N] = COLOR_ADD (ScreenColors [Pixel], Screen [GFX.Delta + N]);
+					break;
+				}
+				Depth [N] = GFX.Z2;
+			}
+		}
+	}
+        break;
+    default:
+        break;
+    }
+}
+
+void DrawClippedTile16Add (uint32 Tile, int32 Offset,
+			   uint32 StartPixel, uint32 Width,
+			   uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_ADD, WRITE_4PIXELS16_FLIPPED_ADD, 4)
+}
+
+void DrawTile16Add1_2 (uint32 Tile, int32 Offset, uint32 StartLine,
+		       uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    RENDER_TILE(WRITE_4PIXELS16_ADD1_2, WRITE_4PIXELS16_FLIPPED_ADD1_2, 4)
+}
+
+void DrawClippedTile16Add1_2 (uint32 Tile, int32 Offset,
+			      uint32 StartPixel, uint32 Width,
+			      uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_ADD1_2, WRITE_4PIXELS16_FLIPPED_ADD1_2, 4)
+}
+
+void DrawTile16Sub (uint32 Tile, int32 Offset, uint32 StartLine,
+		    uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    RENDER_TILE(WRITE_4PIXELS16_SUB, WRITE_4PIXELS16_FLIPPED_SUB, 4)
+}
+
+void DrawClippedTile16Sub (uint32 Tile, int32 Offset,
+			   uint32 StartPixel, uint32 Width,
+			   uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_SUB, WRITE_4PIXELS16_FLIPPED_SUB, 4)
+}
+
+void DrawTile16Sub1_2 (uint32 Tile, int32 Offset, uint32 StartLine,
+		       uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    RENDER_TILE(WRITE_4PIXELS16_SUB1_2, WRITE_4PIXELS16_FLIPPED_SUB1_2, 4)
+}
+
+void DrawClippedTile16Sub1_2 (uint32 Tile, int32 Offset,
+			      uint32 StartPixel, uint32 Width,
+			      uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_SUB1_2, WRITE_4PIXELS16_FLIPPED_SUB1_2, 4)
+}
+
+static void WRITE_4PIXELS16_ADDF1_2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			if (SubDepth [N] == 1)
+				Screen [N] = (uint16) (COLOR_ADD1_2 (ScreenColors [Pixel], GFX.FixedColour));
+			else
+				Screen [N] = ScreenColors [Pixel];
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPED_ADDF1_2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			if (SubDepth [N] == 1)
+				Screen [N] = (uint16) (COLOR_ADD1_2 (ScreenColors [Pixel], GFX.FixedColour));
+			else
+				Screen [N] = ScreenColors [Pixel];
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_SUBF1_2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N]))
+		{
+			if (SubDepth [N] == 1)
+				Screen [N] = (uint16) COLOR_SUB1_2 (ScreenColors [Pixel], GFX.FixedColour);
+			else
+				Screen [N] = ScreenColors [Pixel];
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+static void WRITE_4PIXELS16_FLIPPED_SUBF1_2 (int32 Offset, uint8 *Pixels, uint16 *ScreenColors)
+{
+	uint8  Pixel;
+	uint16 *Screen = (uint16 *) GFX.S + Offset;
+	uint8  *Depth = GFX.ZBuffer + Offset;
+	uint8  *SubDepth = GFX.SubZBuffer + Offset;
+
+	for (uint N = 0; N < 4; N++)
+	{
+		if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N]))
+		{
+			if (SubDepth [N] == 1)
+				Screen [N] = (uint16) COLOR_SUB1_2 (ScreenColors [Pixel], GFX.FixedColour);
+			else
+				Screen [N] = ScreenColors [Pixel];
+			Depth [N] = GFX.Z2;
+		}
+	}
+}
+
+void DrawTile16FixedAdd1_2 (uint32 Tile, int32 Offset, uint32 StartLine,
+			    uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    RENDER_TILE(WRITE_4PIXELS16_ADDF1_2, WRITE_4PIXELS16_FLIPPED_ADDF1_2, 4)
+}
+
+void DrawClippedTile16FixedAdd1_2 (uint32 Tile, int32 Offset,
+				   uint32 StartPixel, uint32 Width,
+				   uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_ADDF1_2, 
+			WRITE_4PIXELS16_FLIPPED_ADDF1_2, 4)
+}
+
+void DrawTile16FixedSub1_2 (uint32 Tile, int32 Offset, uint32 StartLine,
+			    uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    RENDER_TILE(WRITE_4PIXELS16_SUBF1_2, WRITE_4PIXELS16_FLIPPED_SUBF1_2, 4)
+}
+
+void DrawClippedTile16FixedSub1_2 (uint32 Tile, int32 Offset,
+				   uint32 StartPixel, uint32 Width,
+				   uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+    register uint8 *bp;
+
+    TILE_CLIP_PREAMBLE
+    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_SUBF1_2, 
+			WRITE_4PIXELS16_FLIPPED_SUBF1_2, 4)
+}
+
+void DrawLargePixel16Add (uint32 Tile, int32 Offset,
+			  uint32 StartPixel, uint32 Pixels,
+			  uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+
+    register uint16 *sp = (uint16 *) GFX.S + Offset;
+    uint8  *Depth = GFX.ZBuffer + Offset;
+    uint16 pixel;
+
+#define LARGE_ADD_PIXEL(s, p) \
+(Depth [z + GFX.DepthDelta] ? (Depth [z + GFX.DepthDelta] != 1 ? \
+			       COLOR_ADD (p, *(s + GFX.Delta))    : \
+			       COLOR_ADD (p, GFX.FixedColour)) \
+			    : p)
+			      
+    RENDER_TILE_LARGE (ScreenColors [pixel], LARGE_ADD_PIXEL)
+}
+
+void DrawLargePixel16Add1_2 (uint32 Tile, int32 Offset,
+			     uint32 StartPixel, uint32 Pixels,
+			     uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+
+    register uint16 *sp = (uint16 *) GFX.S + Offset;
+    uint8  *Depth = GFX.ZBuffer + Offset;
+    uint16 pixel;
+
+#define LARGE_ADD_PIXEL1_2(s, p) \
+((uint16) (Depth [z + GFX.DepthDelta] ? (Depth [z + GFX.DepthDelta] != 1 ? \
+			       COLOR_ADD1_2 (p, *(s + GFX.Delta))    : \
+			       COLOR_ADD (p, GFX.FixedColour)) \
+			    : p))
+			      
+    RENDER_TILE_LARGE (ScreenColors [pixel], LARGE_ADD_PIXEL1_2)
+}
+
+void DrawLargePixel16Sub (uint32 Tile, int32 Offset,
+			  uint32 StartPixel, uint32 Pixels,
+			  uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+
+    register uint16 *sp = (uint16 *) GFX.S + Offset;
+    uint8  *Depth = GFX.ZBuffer + Offset;
+    uint16 pixel;
+
+#define LARGE_SUB_PIXEL(s, p) \
+(Depth [z + GFX.DepthDelta] ? (Depth [z + GFX.DepthDelta] != 1 ? \
+			       COLOR_SUB (p, *(s + GFX.Delta))    : \
+			       COLOR_SUB (p, GFX.FixedColour)) \
+			    : p)
+			      
+    RENDER_TILE_LARGE (ScreenColors [pixel], LARGE_SUB_PIXEL)
+}
+
+void DrawLargePixel16Sub1_2 (uint32 Tile, int32 Offset,
+			     uint32 StartPixel, uint32 Pixels,
+			     uint32 StartLine, uint32 LineCount)
+{
+    TILE_PREAMBLE
+
+    register uint16 *sp = (uint16 *) GFX.S + Offset;
+    uint8  *Depth = GFX.ZBuffer + Offset;
+    uint16 pixel;
+
+#define LARGE_SUB_PIXEL1_2(s, p) \
+(Depth [z + GFX.DepthDelta] ? (Depth [z + GFX.DepthDelta] != 1 ? \
+			       COLOR_SUB1_2 (p, *(s + GFX.Delta))    : \
+			       COLOR_SUB (p, GFX.FixedColour)) \
+			    : p)
+			      
+    RENDER_TILE_LARGE (ScreenColors [pixel], LARGE_SUB_PIXEL1_2)
+}
+