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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 _DSP4_H_
+#define _DSP4_H_
+
+// debug
+int block;								// current block number
+extern int c;
+
+// op control
+int8 DSP4_Logic;					// controls op flow
+
+// projection format
+const int16 PLANE_START = 0x7fff;	// starting distance
+
+int16 view_plane;					// viewer location
+int16 far_plane;					// next milestone into screen
+int16 segments;						// # raster segments to draw
+int16 raster;							// current raster line
+
+int16 project_x;					// current x-position
+int16 project_y;					// current y-position
+
+int16 project_centerx;		// x-target of projection
+int16 project_centery;		// y-target of projection
+
+int16 project_x1;					// current x-distance
+int16 project_x1low;			// lower 16-bits
+int16 project_y1;					// current y-distance
+int16 project_y1low;			// lower 16-bits
+
+int16 project_x2;					// next projected x-distance
+int16 project_y2;					// next projected y-distance
+
+int16 project_pitchx;			// delta center
+int16 project_pitchxlow;	// lower 16-bits
+int16 project_pitchy;			// delta center
+int16 project_pitchylow;	// lower 16-bits
+
+int16 project_focalx;			// x-point of projection at viewer plane
+int16 project_focaly;			// y-point of projection at viewer plane
+
+int16 project_ptr;				// data structure pointer
+
+// render window
+int16 center_x;						// x-center of viewport
+int16 center_y;						// y-center of viewport
+int16 viewport_left;			// x-left of viewport
+int16 viewport_right;			// x-right of viewport
+int16 viewport_top;				// y-top of viewport
+int16 viewport_bottom;		// y-bottom of viewport
+
+// sprite structure
+int16 sprite_x;						// projected x-pos of sprite
+int16 sprite_y;						// projected y-pos of sprite
+int16 sprite_offset;			// data pointer offset
+int8 sprite_type;					// vehicle, terrain
+bool8 sprite_size;				// sprite size: 8x8 or 16x16
+
+// path strips
+int16 path_clipRight[4];		// value to clip to for x>b
+int16 path_clipLeft[4];			// value to clip to for x<a
+int16 path_pos[4];					// x-positions of lanes
+int16 path_ptr[4];					// data structure pointers
+int16 path_raster[4];				// current raster
+int16 path_top[4];					// viewport_top
+
+int16 path_y[2];						// current y-position
+int16 path_x[2];						// current focals
+int16 path_plane[2];				// previous plane
+
+// op09 window sorting
+int16 multi_index1;					// index counter
+int16 multi_index2;					// index counter
+bool8 op09_mode;						// window mode
+
+// multi-op storage
+int16 multi_focaly[64];			// focal_y values
+int16 multi_farplane[4];		// farthest drawn distance
+int16 multi_raster[4];			// line where track stops
+
+// OAM
+int8 op06_OAM[32];					// OAM (size,MSB) data
+int8 op06_index;						// index into OAM table
+int8 op06_offset;						// offset into OAM table
+
+#endif