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+/*******************************************************************************
+  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.
+*******************************************************************************/
+
+#ifndef _GFX_H_
+#define _GFX_H_
+
+#include "port.h"
+#include "snes9x.h"
+
+struct SGFX{
+    // Initialize these variables
+    uint8  *Screen;
+    uint8  *SubScreen;
+    uint8  *ZBuffer;
+    uint8  *SubZBuffer;
+    uint32 Pitch;
+
+    // Setup in call to S9xGraphicsInit()
+    int   Delta;
+    uint16 *X2;
+    uint16 *ZERO_OR_X2;
+    uint16 *ZERO;
+    uint32 RealPitch; // True pitch of Screen buffer.
+    uint32 Pitch2;    // Same as RealPitch except while using speed up hack for Glide.
+    uint32 ZPitch;    // Pitch of ZBuffer
+    uint32 PPL;	      // Number of pixels on each of Screen buffer
+    uint32 PPLx2;
+    uint32 PixSize;
+    uint8  *S;
+    uint8  *DB;
+    uint16 *ScreenColors;
+    uint32 DepthDelta;
+    uint8  Z1;          // Depth for comparison
+    uint8  Z2;          // Depth to save
+    uint8  ZSprite;     // Used to ensure only 1st sprite is drawn per pixel
+    uint32 FixedColour;
+    const char *InfoString;
+    uint32 InfoStringTimeout;
+    uint32 StartY;
+    uint32 EndY;
+    struct ClipData *pCurrentClip;
+    uint32 Mode7Mask;
+    uint32 Mode7PriorityMask;
+    uint8  OBJWidths[128];
+    uint8  OBJVisibleTiles[128];
+    struct {
+        uint8 RTOFlags;
+        int16 Tiles;
+        struct {
+            int8 Sprite;
+            uint8 Line;
+        } OBJ[32];
+    } OBJLines [SNES_HEIGHT_EXTENDED];
+
+    uint8  r212c;
+    uint8  r212d;
+    uint8  r2130;
+    uint8  r2131;
+    bool8  Pseudo;
+    
+#ifdef GFX_MULTI_FORMAT
+    uint32 PixelFormat;
+    uint32 (*BuildPixel) (uint32 R, uint32 G, uint32 B);
+    uint32 (*BuildPixel2) (uint32 R, uint32 G, uint32 B);
+    void   (*DecomposePixel) (uint32 Pixel, uint32 &R, uint32 &G, uint32 &B);
+#endif
+};
+
+struct SLineData {
+    struct {
+	uint16 VOffset;
+	uint16 HOffset;
+    } BG [4];
+};
+
+#define H_FLIP 0x4000
+#define V_FLIP 0x8000
+#define BLANK_TILE 2
+
+struct SBG
+{
+    uint32 TileSize;
+    uint32 BitShift;
+    uint32 TileShift;
+    uint32 TileAddress;
+    uint32 NameSelect;
+    uint32 SCBase;
+
+    uint32 StartPalette;
+    uint32 PaletteShift;
+    uint32 PaletteMask;
+    
+    uint8 *Buffer;
+    uint8 *Buffered;
+    bool8  DirectColourMode;
+};
+
+struct SLineMatrixData
+{
+    short MatrixA;
+    short MatrixB;
+    short MatrixC;
+    short MatrixD;
+    short CentreX;
+    short CentreY;
+};
+
+extern uint32 odd_high [4][16];
+extern uint32 odd_low [4][16];
+extern uint32 even_high [4][16];
+extern uint32 even_low [4][16];
+extern SBG BG;
+extern uint16 DirectColourMaps [8][256];
+
+extern uint8 add32_32 [32][32];
+extern uint8 add32_32_half [32][32];
+extern uint8 sub32_32 [32][32];
+extern uint8 sub32_32_half [32][32];
+extern uint8 mul_brightness [16][32];
+
+// Could use BSWAP instruction on Intel port...
+#define SWAP_DWORD(dw) dw = ((dw & 0xff) << 24) | ((dw & 0xff00) << 8) | \
+		            ((dw & 0xff0000) >> 8) | ((dw & 0xff000000) >> 24)
+
+#ifdef FAST_LSB_WORD_ACCESS
+#define READ_2BYTES(s) (*(uint16 *) (s))
+#define WRITE_2BYTES(s, d) *(uint16 *) (s) = (d)
+#else
+#ifdef LSB_FIRST
+#define READ_2BYTES(s) (*(uint8 *) (s) | (*((uint8 *) (s) + 1) << 8))
+#define WRITE_2BYTES(s, d) *(uint8 *) (s) = (d), \
+			   *((uint8 *) (s) + 1) = (d) >> 8
+#else  // else MSB_FISRT
+#define READ_2BYTES(s) (*(uint8 *) (s) | (*((uint8 *) (s) + 1) << 8))
+#define WRITE_2BYTES(s, d) *(uint8 *) (s) = (d), \
+			   *((uint8 *) (s) + 1) = (d) >> 8
+#endif // LSB_FIRST
+#endif // i386
+
+#define SUB_SCREEN_DEPTH 0
+#define MAIN_SCREEN_DEPTH 32
+
+#if defined(OLD_COLOUR_BLENDING)
+#define COLOR_ADD(C1, C2) \
+GFX.X2 [((((C1) & RGB_REMOVE_LOW_BITS_MASK) + \
+	  ((C2) & RGB_REMOVE_LOW_BITS_MASK)) >> 1) + \
+	((C1) & (C2) & RGB_LOW_BITS_MASK)]
+#else
+#define COLOR_ADD(C1, C2) \
+(GFX.X2 [((((C1) & RGB_REMOVE_LOW_BITS_MASK) + \
+	  ((C2) & RGB_REMOVE_LOW_BITS_MASK)) >> 1) + \
+	 ((C1) & (C2) & RGB_LOW_BITS_MASK)] | \
+ (((C1) ^ (C2)) & RGB_LOW_BITS_MASK))	   
+#endif
+
+#define COLOR_ADD1_2(C1, C2) \
+(((((C1) & RGB_REMOVE_LOW_BITS_MASK) + \
+          ((C2) & RGB_REMOVE_LOW_BITS_MASK)) >> 1) + \
+         ((C1) & (C2) & RGB_LOW_BITS_MASK) | ALPHA_BITS_MASK)
+
+#if defined(OLD_COLOUR_BLENDING)
+#define COLOR_SUB(C1, C2) \
+GFX.ZERO_OR_X2 [(((C1) | RGB_HI_BITS_MASKx2) - \
+		 ((C2) & RGB_REMOVE_LOW_BITS_MASK)) >> 1]
+#elif !defined(NEW_COLOUR_BLENDING)
+#define COLOR_SUB(C1, C2) \
+(GFX.ZERO_OR_X2 [(((C1) | RGB_HI_BITS_MASKx2) - \
+                  ((C2) & RGB_REMOVE_LOW_BITS_MASK)) >> 1] + \
+((C1) & RGB_LOW_BITS_MASK) - ((C2) & RGB_LOW_BITS_MASK))
+#else
+inline uint16 COLOR_SUB(uint16, uint16);
+
+inline uint16 COLOR_SUB(uint16 C1, uint16 C2)
+{
+	uint16	mC1, mC2, v = 0;
+
+	mC1 = C1 & FIRST_COLOR_MASK;
+	mC2 = C2 & FIRST_COLOR_MASK;
+	if (mC1 > mC2) v += (mC1 - mC2);
+	
+	mC1 = C1 & SECOND_COLOR_MASK;
+	mC2 = C2 & SECOND_COLOR_MASK;
+	if (mC1 > mC2) v += (mC1 - mC2);
+
+	mC1 = C1 & THIRD_COLOR_MASK;
+	mC2 = C2 & THIRD_COLOR_MASK;
+	if (mC1 > mC2) v += (mC1 - mC2);
+	
+	return v;
+}
+#endif
+
+#define COLOR_SUB1_2(C1, C2) \
+GFX.ZERO [(((C1) | RGB_HI_BITS_MASKx2) - \
+	   ((C2) & RGB_REMOVE_LOW_BITS_MASK)) >> 1]
+
+typedef void (*NormalTileRenderer) (uint32 Tile, uint32 Offset, 
+				    uint32 StartLine, uint32 LineCount);
+typedef void (*ClippedTileRenderer) (uint32 Tile, uint32 Offset,
+				     uint32 StartPixel, uint32 Width,
+				     uint32 StartLine, uint32 LineCount);
+typedef void (*LargePixelRenderer) (uint32 Tile, uint32 Offset,
+				    uint32 StartPixel, uint32 Pixels,
+				    uint32 StartLine, uint32 LineCount);
+
+START_EXTERN_C
+void S9xStartScreenRefresh ();
+void S9xDrawScanLine (uint8 Line);
+void S9xEndScreenRefresh ();
+void S9xSetupOBJ ();
+void S9xUpdateScreen ();
+void RenderLine (uint8 line);
+void S9xBuildDirectColourMaps ();
+
+// External port interface which must be implemented or initialised for each
+// port.
+extern struct SGFX GFX;
+
+bool8 S9xGraphicsInit ();
+void S9xGraphicsDeinit();
+bool8 S9xInitUpdate (void);
+bool8 S9xDeinitUpdate (int Width, int Height, bool8 sixteen_bit);
+void S9xSyncSpeed ();
+
+#ifdef GFX_MULTI_FORMAT
+bool8 S9xSetRenderPixelFormat (int format);
+#endif
+
+END_EXTERN_C
+
+#endif
+