mirror of
https://github.com/dborth/snes9xgx.git
synced 2024-12-05 00:44:19 +01:00
65984b9102
- added: option to disable AA filtering (snes graphics 'crisper', AA now default OFF) - added: mapped zooming and turbo mode to classic controller - added: preliminary usb support (loading) - changed: sram and freezes now saved by filename, not internal romname. If you have multiple versions of the same game, you can now have srams and freezes for each version. A prompt to convert to the new naming is provided for sram only. - changed: by default, autoload/save sram and freeze enabled
2378 lines
60 KiB
C++
2378 lines
60 KiB
C++
/**********************************************************************************
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
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Jerremy Koot (jkoot@snes9x.com)
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(c) Copyright 2002 - 2004 Matthew Kendora
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(c) Copyright 2002 - 2005 Peter Bortas (peter@bortas.org)
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(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
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(c) Copyright 2001 - 2006 John Weidman (jweidman@slip.net)
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(c) Copyright 2002 - 2006 Brad Jorsch (anomie@users.sourceforge.net),
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funkyass (funkyass@spam.shaw.ca),
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Kris Bleakley (codeviolation@hotmail.com),
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Nach (n-a-c-h@users.sourceforge.net), and
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zones (kasumitokoduck@yahoo.com)
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BS-X C emulator code
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(c) Copyright 2005 - 2006 Dreamer Nom,
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zones
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C4 x86 assembler and some C emulation code
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(c) Copyright 2000 - 2003 _Demo_ (_demo_@zsnes.com),
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Nach,
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zsKnight (zsknight@zsnes.com)
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C4 C++ code
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(c) Copyright 2003 - 2006 Brad Jorsch,
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Nach
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DSP-1 emulator code
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(c) Copyright 1998 - 2006 _Demo_,
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Andreas Naive (andreasnaive@gmail.com)
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Gary Henderson,
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Ivar (ivar@snes9x.com),
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John Weidman,
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Kris Bleakley,
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Matthew Kendora,
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Nach,
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neviksti (neviksti@hotmail.com)
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DSP-2 emulator code
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(c) Copyright 2003 John Weidman,
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Kris Bleakley,
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Lord Nightmare (lord_nightmare@users.sourceforge.net),
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Matthew Kendora,
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neviksti
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DSP-3 emulator code
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(c) Copyright 2003 - 2006 John Weidman,
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Kris Bleakley,
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Lancer,
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z80 gaiden
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DSP-4 emulator code
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(c) Copyright 2004 - 2006 Dreamer Nom,
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John Weidman,
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Kris Bleakley,
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Nach,
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z80 gaiden
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OBC1 emulator code
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(c) Copyright 2001 - 2004 zsKnight,
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pagefault (pagefault@zsnes.com),
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Kris Bleakley,
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Ported from x86 assembler to C by sanmaiwashi
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SPC7110 and RTC C++ emulator code
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(c) Copyright 2002 Matthew Kendora with research by
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zsKnight,
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John Weidman,
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Dark Force
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S-DD1 C emulator code
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(c) Copyright 2003 Brad Jorsch with research by
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Andreas Naive,
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John Weidman
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S-RTC C emulator code
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(c) Copyright 2001-2006 byuu,
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John Weidman
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ST010 C++ emulator code
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(c) Copyright 2003 Feather,
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John Weidman,
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Kris Bleakley,
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Matthew Kendora
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Super FX x86 assembler emulator code
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(c) Copyright 1998 - 2003 _Demo_,
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pagefault,
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zsKnight,
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Super FX C emulator code
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(c) Copyright 1997 - 1999 Ivar,
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Gary Henderson,
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John Weidman
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Sound DSP emulator code is derived from SNEeSe and OpenSPC:
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(c) Copyright 1998 - 2003 Brad Martin
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(c) Copyright 1998 - 2006 Charles Bilyue'
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SH assembler code partly based on x86 assembler code
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(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
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2xSaI filter
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(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
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HQ2x filter
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(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
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Specific ports contains the works of other authors. See headers in
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individual files.
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Snes9x homepage: http://www.snes9x.com
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Permission to use, copy, modify and/or distribute Snes9x in both binary
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and source form, for non-commercial purposes, is hereby granted without
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fee, providing that this license information and copyright notice appear
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with all copies and any derived work.
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This software is provided 'as-is', without any express or implied
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warranty. In no event shall the authors be held liable for any damages
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arising from the use of this software or it's derivatives.
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Snes9x is freeware for PERSONAL USE only. Commercial users should
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seek permission of the copyright holders first. Commercial use includes,
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but is not limited to, charging money for Snes9x or software derived from
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Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
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using Snes9x as a promotion for your commercial product.
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The copyright holders request that bug fixes and improvements to the code
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should be forwarded to them so everyone can benefit from the modifications
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in future versions.
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Super NES and Super Nintendo Entertainment System are trademarks of
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Nintendo Co., Limited and its subsidiary companies.
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**********************************************************************************/
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#include "snes9x.h"
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#include "memmap.h"
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#include <string.h>
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/*
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Due recognition and credit are given on Overload's DSP website.
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Thank those contributors for their hard work on this chip.
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Fixed-point math reminder:
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[sign, integer, fraction]
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1.15.00 * 1.15.00 = 2.30.00 -> 1.30.00 (DSP) -> 1.31.00 (LSB is '0')
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1.15.00 * 1.00.15 = 2.15.15 -> 1.15.15 (DSP) -> 1.15.16 (LSB is '0')
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*/
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typedef struct
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{
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bool8 waiting4command;
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bool8 half_command;
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uint16 command;
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uint32 in_count;
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uint32 in_index;
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uint32 out_count;
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uint32 out_index;
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uint8 parameters[512];
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uint8 output[512];
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} SDSP4;
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SDSP4 DSP4;
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//Todo: get all of this into a struct for easy save stating
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// op control
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int8 DSP4_Logic; // controls op flow
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// projection format
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int16 lcv; // loop-control variable
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int16 distance; // z-position into virtual world
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int16 raster; // current raster line
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int16 segments; // number of raster lines drawn
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// 1.15.16 or 1.15.0 [sign, integer, fraction]
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int32 world_x; // line of x-projection in world
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int32 world_y; // line of y-projection in world
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int32 world_dx; // projection line x-delta
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int32 world_dy; // projection line y-delta
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int16 world_ddx; // x-delta increment
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int16 world_ddy; // y-delta increment
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int32 world_xenv; // world x-shaping factor
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int16 world_yofs; // world y-vertical scroll
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int16 view_x1; // current viewer-x
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int16 view_y1; // current viewer-y
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int16 view_x2; // future viewer-x
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int16 view_y2; // future viewer-y
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int16 view_dx; // view x-delta factor
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int16 view_dy; // view y-delta factor
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int16 view_xofs1; // current viewer x-vertical scroll
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int16 view_yofs1; // current viewer y-vertical scroll
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int16 view_xofs2; // future viewer x-vertical scroll
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int16 view_yofs2; // future viewer y-vertical scroll
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int16 view_yofsenv; // y-scroll shaping factor
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int16 view_turnoff_x; // road turnoff data
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int16 view_turnoff_dx; // road turnoff delta factor
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// drawing area
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int16 viewport_cx; // x-center of viewport window
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int16 viewport_cy; // y-center of render window
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int16 viewport_left; // x-left of viewport
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int16 viewport_right; // x-right of viewport
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int16 viewport_top; // y-top of viewport
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int16 viewport_bottom; // y-bottom of viewport
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// sprite structure
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int16 sprite_x; // projected x-pos of sprite
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int16 sprite_y; // projected y-pos of sprite
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int16 sprite_attr; // obj attributes
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bool8 sprite_size; // sprite size: 8x8 or 16x16
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int16 sprite_clipy; // visible line to clip pixels off
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int16 sprite_count;
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// generic projection variables designed for
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// two solid polygons + two polygon sides
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int16 poly_clipLf[2][2]; // left clip boundary
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int16 poly_clipRt[2][2]; // right clip boundary
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int16 poly_ptr[2][2]; // HDMA structure pointers
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int16 poly_raster[2][2]; // current raster line below horizon
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int16 poly_top[2][2]; // top clip boundary
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int16 poly_bottom[2][2]; // bottom clip boundary
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int16 poly_cx[2][2]; // center for left/right points
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int16 poly_start[2]; // current projection points
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int16 poly_plane[2]; // previous z-plane distance
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// OAM
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int16 OAM_attr[16]; // OAM (size,MSB) data
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int16 OAM_index; // index into OAM table
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int16 OAM_bits; // offset into OAM table
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int16 OAM_RowMax; // maximum number of tiles per 8 aligned pixels (row)
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int16 OAM_Row[32]; // current number of tiles per row
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//////////////////////////////////////////////////////////////
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// input protocol
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static int16 DSP4_READ_WORD()
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{
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int16 out;
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out = READ_WORD(DSP4.parameters + DSP4.in_index);
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DSP4.in_index += 2;
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return out;
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}
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static int32 DSP4_READ_DWORD()
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{
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int32 out;
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out = READ_DWORD(DSP4.parameters + DSP4.in_index);
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DSP4.in_index += 4;
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return out;
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}
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//////////////////////////////////////////////////////////////
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// output protocol
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#define DSP4_CLEAR_OUT() \
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{ DSP4.out_count = 0; DSP4.out_index = 0; }
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#define DSP4_WRITE_BYTE( d ) \
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{ WRITE_WORD( DSP4.output + DSP4.out_count, ( d ) ); DSP4.out_count++; }
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#define DSP4_WRITE_WORD( d ) \
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{ WRITE_WORD( DSP4.output + DSP4.out_count, ( d ) ); DSP4.out_count += 2; }
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#ifndef MSB_FIRST
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#define DSP4_WRITE_16_WORD( d ) \
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{ memcpy(DSP4.output + DSP4.out_count, ( d ), 32); DSP4.out_count += 32; }
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#else
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#define DSP4_WRITE_16_WORD( d ) \
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{ for (int p = 0; p < 16; p++) DSP4_WRITE_WORD((d)[p]); }
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#endif
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#ifdef PRINT_OP
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#define DSP4_WRITE_DEBUG( x, d ) \
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WRITE_WORD( nop + x, d );
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#endif
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#ifdef DEBUG_DSP
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#define DSP4_WRITE_DEBUG( x, d ) \
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WRITE_WORD( nop + x, d );
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#endif
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//////////////////////////////////////////////////////////////
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// used to wait for dsp i/o
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#define DSP4_WAIT( x ) \
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DSP4.in_index = 0; DSP4_Logic = x; return;
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//////////////////////////////////////////////////////////////
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// 1.7.8 -> 1.15.16
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#define SEX78( a ) ( ( (int32) ( (int16) (a) ) ) << 8 )
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// 1.15.0 -> 1.15.16
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#define SEX16( a ) ( ( (int32) ( (int16) (a) ) ) << 16 )
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#ifdef PRINT_OP
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#define U16( a ) ( (uint16) ( a ) )
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#endif
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#ifdef DEBUG_DSP
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#define U16( a ) ( (uint16) ( a ) )
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#endif
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//////////////////////////////////////////////////////////////
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// Attention: This lookup table is not verified
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const uint16 div_lut[64] = { 0x0000, 0x8000, 0x4000, 0x2aaa, 0x2000, 0x1999, 0x1555, 0x1249, 0x1000, 0x0e38,
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0x0ccc, 0x0ba2, 0x0aaa, 0x09d8, 0x0924, 0x0888, 0x0800, 0x0787, 0x071c, 0x06bc,
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0x0666, 0x0618, 0x05d1, 0x0590, 0x0555, 0x051e, 0x04ec, 0x04bd, 0x0492, 0x0469,
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0x0444, 0x0421, 0x0400, 0x03e0, 0x03c3, 0x03a8, 0x038e, 0x0375, 0x035e, 0x0348,
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0x0333, 0x031f, 0x030c, 0x02fa, 0x02e8, 0x02d8, 0x02c8, 0x02b9, 0x02aa, 0x029c,
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0x028f, 0x0282, 0x0276, 0x026a, 0x025e, 0x0253, 0x0249, 0x023e, 0x0234, 0x022b,
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0x0222, 0x0219, 0x0210, 0x0208, };
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int16 DSP4_Inverse(int16 value)
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{
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// saturate bounds
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if (value < 0)
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{
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value = 0;
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}
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if (value > 63)
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{
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value = 63;
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}
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return div_lut[value];
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}
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//////////////////////////////////////////////////////////////
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// Prototype
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void DSP4_OP0B(bool8 *draw, int16 sp_x, int16 sp_y, int16 sp_attr, bool8 size, bool8 stop);
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//////////////////////////////////////////////////////////////
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// OP00
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void DSP4_Multiply(int16 Multiplicand, int16 Multiplier, int32 *Product)
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{
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*Product = (Multiplicand * Multiplier << 1) >> 1;
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}
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//////////////////////////////////////////////////////////////
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void DSP4_OP01()
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{
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DSP4.waiting4command = FALSE;
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// op flow control
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switch (DSP4_Logic)
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{
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case 1:
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goto resume1; break;
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case 2:
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goto resume2; break;
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case 3:
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goto resume3; break;
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}
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////////////////////////////////////////////////////
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// process initial inputs
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// sort inputs
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world_y = DSP4_READ_DWORD();
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poly_bottom[0][0] = DSP4_READ_WORD();
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poly_top[0][0] = DSP4_READ_WORD();
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poly_cx[1][0] = DSP4_READ_WORD();
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viewport_bottom = DSP4_READ_WORD();
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world_x = DSP4_READ_DWORD();
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poly_cx[0][0] = DSP4_READ_WORD();
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poly_ptr[0][0] = DSP4_READ_WORD();
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world_yofs = DSP4_READ_WORD();
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world_dy = DSP4_READ_DWORD();
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world_dx = DSP4_READ_DWORD();
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distance = DSP4_READ_WORD();
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DSP4_READ_WORD(); // 0x0000
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world_xenv = DSP4_READ_DWORD();
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world_ddy = DSP4_READ_WORD();
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world_ddx = DSP4_READ_WORD();
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view_yofsenv = DSP4_READ_WORD();
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// initial (x,y,offset) at starting raster line
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view_x1 = (world_x + world_xenv) >> 16;
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view_y1 = world_y >> 16;
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view_xofs1 = world_x >> 16;
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view_yofs1 = world_yofs;
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view_turnoff_x = 0;
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view_turnoff_dx = 0;
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// first raster line
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poly_raster[0][0] = poly_bottom[0][0];
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do
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{
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////////////////////////////////////////////////////
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// process one iteration of projection
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// perspective projection of world (x,y,scroll) points
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// based on the current projection lines
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view_x2 = ( ( ( world_x + world_xenv ) >> 16 ) * distance >> 15 ) + ( view_turnoff_x * distance >> 15 );
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view_y2 = (world_y >> 16) * distance >> 15;
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view_xofs2 = view_x2;
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view_yofs2 = (world_yofs * distance >> 15) + poly_bottom[0][0] - view_y2;
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// 1. World x-location before transformation
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// 2. Viewer x-position at the next
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// 3. World y-location before perspective projection
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// 4. Viewer y-position below the horizon
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// 5. Number of raster lines drawn in this iteration
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DSP4_CLEAR_OUT();
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DSP4_WRITE_WORD((world_x + world_xenv) >> 16);
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DSP4_WRITE_WORD(view_x2);
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DSP4_WRITE_WORD(world_y >> 16);
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DSP4_WRITE_WORD(view_y2);
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//////////////////////////////////////////////////////
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// SR = 0x00
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// determine # of raster lines used
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segments = poly_raster[0][0] - view_y2;
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// prevent overdraw
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if (view_y2 >= poly_raster[0][0])
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segments = 0;
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else
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poly_raster[0][0] = view_y2;
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// don't draw outside the window
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if (view_y2 < poly_top[0][0])
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{
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segments = 0;
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// flush remaining raster lines
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if (view_y1 >= poly_top[0][0])
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segments = view_y1 - poly_top[0][0];
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}
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// SR = 0x80
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DSP4_WRITE_WORD(segments);
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//////////////////////////////////////////////////////
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// scan next command if no SR check needed
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if (segments)
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{
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int32 px_dx, py_dy;
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int32 x_scroll, y_scroll;
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// SR = 0x00
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// linear interpolation (lerp) between projected points
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px_dx = (view_xofs2 - view_xofs1) * DSP4_Inverse(segments) << 1;
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py_dy = (view_yofs2 - view_yofs1) * DSP4_Inverse(segments) << 1;
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// starting step values
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x_scroll = SEX16(poly_cx[0][0] + view_xofs1);
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y_scroll = SEX16(-viewport_bottom + view_yofs1 + view_yofsenv + poly_cx[1][0] - world_yofs);
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// SR = 0x80
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// rasterize line
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for (lcv = 0; lcv < segments; lcv++)
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{
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// 1. HDMA memory pointer (bg1)
|
|
// 2. vertical scroll offset ($210E)
|
|
// 3. horizontal scroll offset ($210D)
|
|
|
|
DSP4_WRITE_WORD(poly_ptr[0][0]);
|
|
DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16);
|
|
DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16);
|
|
|
|
|
|
// update memory address
|
|
poly_ptr[0][0] -= 4;
|
|
|
|
// update screen values
|
|
x_scroll += px_dx;
|
|
y_scroll += py_dy;
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// Post-update
|
|
|
|
// update new viewer (x,y,scroll) to last raster line drawn
|
|
view_x1 = view_x2;
|
|
view_y1 = view_y2;
|
|
view_xofs1 = view_xofs2;
|
|
view_yofs1 = view_yofs2;
|
|
|
|
// add deltas for projection lines
|
|
world_dx += SEX78(world_ddx);
|
|
world_dy += SEX78(world_ddy);
|
|
|
|
// update projection lines
|
|
world_x += (world_dx + world_xenv);
|
|
world_y += world_dy;
|
|
|
|
// update road turnoff position
|
|
view_turnoff_x += view_turnoff_dx;
|
|
|
|
////////////////////////////////////////////////////
|
|
// command check
|
|
|
|
// scan next command
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(1) resume1 :
|
|
|
|
// check for termination
|
|
distance = DSP4_READ_WORD();
|
|
if (distance == -0x8000)
|
|
break;
|
|
|
|
// road turnoff
|
|
if( (uint16) distance == 0x8001 )
|
|
{
|
|
DSP4.in_count = 6;
|
|
DSP4_WAIT(2) resume2:
|
|
|
|
distance = DSP4_READ_WORD();
|
|
view_turnoff_x = DSP4_READ_WORD();
|
|
view_turnoff_dx = DSP4_READ_WORD();
|
|
|
|
// factor in new changes
|
|
view_x1 += ( view_turnoff_x * distance >> 15 );
|
|
view_xofs1 += ( view_turnoff_x * distance >> 15 );
|
|
|
|
// update stepping values
|
|
view_turnoff_x += view_turnoff_dx;
|
|
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(1)
|
|
}
|
|
|
|
// already have 2 bytes read
|
|
DSP4.in_count = 6;
|
|
DSP4_WAIT(3) resume3 :
|
|
|
|
// inspect inputs
|
|
world_ddy = DSP4_READ_WORD();
|
|
world_ddx = DSP4_READ_WORD();
|
|
view_yofsenv = DSP4_READ_WORD();
|
|
|
|
// no envelope here
|
|
world_xenv = 0;
|
|
}
|
|
while (1);
|
|
|
|
// terminate op
|
|
DSP4.waiting4command = TRUE;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
|
|
void DSP4_OP03()
|
|
{
|
|
OAM_RowMax = 33;
|
|
memset(OAM_Row, 0, 64);
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
|
|
void DSP4_OP05()
|
|
{
|
|
OAM_index = 0;
|
|
OAM_bits = 0;
|
|
memset(OAM_attr, 0, 32);
|
|
sprite_count = 0;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
void DSP4_OP06()
|
|
{
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_16_WORD(OAM_attr);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
|
|
void DSP4_OP07()
|
|
{
|
|
DSP4.waiting4command = FALSE;
|
|
|
|
// op flow control
|
|
switch (DSP4_Logic)
|
|
{
|
|
case 1:
|
|
goto resume1; break;
|
|
case 2:
|
|
goto resume2; break;
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// sort inputs
|
|
|
|
world_y = DSP4_READ_DWORD();
|
|
poly_bottom[0][0] = DSP4_READ_WORD();
|
|
poly_top[0][0] = DSP4_READ_WORD();
|
|
poly_cx[1][0] = DSP4_READ_WORD();
|
|
viewport_bottom = DSP4_READ_WORD();
|
|
world_x = DSP4_READ_DWORD();
|
|
poly_cx[0][0] = DSP4_READ_WORD();
|
|
poly_ptr[0][0] = DSP4_READ_WORD();
|
|
world_yofs = DSP4_READ_WORD();
|
|
distance = DSP4_READ_WORD();
|
|
view_y2 = DSP4_READ_WORD();
|
|
view_dy = DSP4_READ_WORD() * distance >> 15;
|
|
view_x2 = DSP4_READ_WORD();
|
|
view_dx = DSP4_READ_WORD() * distance >> 15;
|
|
view_yofsenv = DSP4_READ_WORD();
|
|
|
|
// initial (x,y,offset) at starting raster line
|
|
view_x1 = world_x >> 16;
|
|
view_y1 = world_y >> 16;
|
|
view_xofs1 = view_x1;
|
|
view_yofs1 = world_yofs;
|
|
|
|
// first raster line
|
|
poly_raster[0][0] = poly_bottom[0][0];
|
|
|
|
|
|
do
|
|
{
|
|
////////////////////////////////////////////////////
|
|
// process one iteration of projection
|
|
|
|
// add shaping
|
|
view_x2 += view_dx;
|
|
view_y2 += view_dy;
|
|
|
|
// vertical scroll calculation
|
|
view_xofs2 = view_x2;
|
|
view_yofs2 = (world_yofs * distance >> 15) + poly_bottom[0][0] - view_y2;
|
|
|
|
// 1. Viewer x-position at the next
|
|
// 2. Viewer y-position below the horizon
|
|
// 3. Number of raster lines drawn in this iteration
|
|
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_WORD(view_x2);
|
|
DSP4_WRITE_WORD(view_y2);
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
// SR = 0x00
|
|
|
|
// determine # of raster lines used
|
|
segments = view_y1 - view_y2;
|
|
|
|
// prevent overdraw
|
|
if (view_y2 >= poly_raster[0][0])
|
|
segments = 0;
|
|
else
|
|
poly_raster[0][0] = view_y2;
|
|
|
|
// don't draw outside the window
|
|
if (view_y2 < poly_top[0][0])
|
|
{
|
|
segments = 0;
|
|
|
|
// flush remaining raster lines
|
|
if (view_y1 >= poly_top[0][0])
|
|
segments = view_y1 - poly_top[0][0];
|
|
}
|
|
|
|
// SR = 0x80
|
|
|
|
DSP4_WRITE_WORD(segments);
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
// scan next command if no SR check needed
|
|
if (segments)
|
|
{
|
|
int32 px_dx, py_dy;
|
|
int32 x_scroll, y_scroll;
|
|
|
|
// SR = 0x00
|
|
|
|
// linear interpolation (lerp) between projected points
|
|
px_dx = (view_xofs2 - view_xofs1) * DSP4_Inverse(segments) << 1;
|
|
py_dy = (view_yofs2 - view_yofs1) * DSP4_Inverse(segments) << 1;
|
|
|
|
// starting step values
|
|
x_scroll = SEX16(poly_cx[0][0] + view_xofs1);
|
|
y_scroll = SEX16(-viewport_bottom + view_yofs1 + view_yofsenv + poly_cx[1][0] - world_yofs);
|
|
|
|
// SR = 0x80
|
|
|
|
// rasterize line
|
|
for (lcv = 0; lcv < segments; lcv++)
|
|
{
|
|
// 1. HDMA memory pointer (bg2)
|
|
// 2. vertical scroll offset ($2110)
|
|
// 3. horizontal scroll offset ($210F)
|
|
|
|
DSP4_WRITE_WORD(poly_ptr[0][0]);
|
|
DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16);
|
|
DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16);
|
|
|
|
// update memory address
|
|
poly_ptr[0][0] -= 4;
|
|
|
|
// update screen values
|
|
x_scroll += px_dx;
|
|
y_scroll += py_dy;
|
|
}
|
|
}
|
|
|
|
/////////////////////////////////////////////////////
|
|
// Post-update
|
|
|
|
// update new viewer (x,y,scroll) to last raster line drawn
|
|
view_x1 = view_x2;
|
|
view_y1 = view_y2;
|
|
view_xofs1 = view_xofs2;
|
|
view_yofs1 = view_yofs2;
|
|
|
|
////////////////////////////////////////////////////
|
|
// command check
|
|
|
|
// scan next command
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(1) resume1 :
|
|
|
|
// check for opcode termination
|
|
distance = DSP4_READ_WORD();
|
|
if (distance == -0x8000)
|
|
break;
|
|
|
|
// already have 2 bytes in queue
|
|
DSP4.in_count = 10;
|
|
DSP4_WAIT(2) resume2 :
|
|
|
|
// inspect inputs
|
|
view_y2 = DSP4_READ_WORD();
|
|
view_dy = DSP4_READ_WORD() * distance >> 15;
|
|
view_x2 = DSP4_READ_WORD();
|
|
view_dx = DSP4_READ_WORD() * distance >> 15;
|
|
view_yofsenv = DSP4_READ_WORD();
|
|
}
|
|
while (1);
|
|
|
|
DSP4.waiting4command = TRUE;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
void DSP4_OP08()
|
|
{
|
|
int16 win_left, win_right;
|
|
int16 view_x[2], view_y[2];
|
|
int16 envelope[2][2];
|
|
|
|
DSP4.waiting4command = FALSE;
|
|
|
|
// op flow control
|
|
switch (DSP4_Logic)
|
|
{
|
|
case 1:
|
|
goto resume1; break;
|
|
case 2:
|
|
goto resume2; break;
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// process initial inputs for two polygons
|
|
|
|
// clip values
|
|
poly_clipRt[0][0] = DSP4_READ_WORD();
|
|
poly_clipRt[0][1] = DSP4_READ_WORD();
|
|
poly_clipRt[1][0] = DSP4_READ_WORD();
|
|
poly_clipRt[1][1] = DSP4_READ_WORD();
|
|
|
|
poly_clipLf[0][0] = DSP4_READ_WORD();
|
|
poly_clipLf[0][1] = DSP4_READ_WORD();
|
|
poly_clipLf[1][0] = DSP4_READ_WORD();
|
|
poly_clipLf[1][1] = DSP4_READ_WORD();
|
|
|
|
// unknown (constant) (ex. 1P/2P = $00A6, $00A6, $00A6, $00A6)
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
|
|
// unknown (constant) (ex. 1P/2P = $00A5, $00A5, $00A7, $00A7)
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
|
|
// polygon centering (left,right)
|
|
poly_cx[0][0] = DSP4_READ_WORD();
|
|
poly_cx[0][1] = DSP4_READ_WORD();
|
|
poly_cx[1][0] = DSP4_READ_WORD();
|
|
poly_cx[1][1] = DSP4_READ_WORD();
|
|
|
|
// HDMA pointer locations
|
|
poly_ptr[0][0] = DSP4_READ_WORD();
|
|
poly_ptr[0][1] = DSP4_READ_WORD();
|
|
poly_ptr[1][0] = DSP4_READ_WORD();
|
|
poly_ptr[1][1] = DSP4_READ_WORD();
|
|
|
|
// starting raster line below the horizon
|
|
poly_bottom[0][0] = DSP4_READ_WORD();
|
|
poly_bottom[0][1] = DSP4_READ_WORD();
|
|
poly_bottom[1][0] = DSP4_READ_WORD();
|
|
poly_bottom[1][1] = DSP4_READ_WORD();
|
|
|
|
// top boundary line to clip
|
|
poly_top[0][0] = DSP4_READ_WORD();
|
|
poly_top[0][1] = DSP4_READ_WORD();
|
|
poly_top[1][0] = DSP4_READ_WORD();
|
|
poly_top[1][1] = DSP4_READ_WORD();
|
|
|
|
// unknown
|
|
// (ex. 1P = $2FC8, $0034, $FF5C, $0035)
|
|
//
|
|
// (ex. 2P = $3178, $0034, $FFCC, $0035)
|
|
// (ex. 2P = $2FC8, $0034, $FFCC, $0035)
|
|
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
DSP4_READ_WORD();
|
|
|
|
// look at guidelines for both polygon shapes
|
|
distance = DSP4_READ_WORD();
|
|
view_x[0] = DSP4_READ_WORD();
|
|
view_y[0] = DSP4_READ_WORD();
|
|
view_x[1] = DSP4_READ_WORD();
|
|
view_y[1] = DSP4_READ_WORD();
|
|
|
|
// envelope shaping guidelines (one frame only)
|
|
envelope[0][0] = DSP4_READ_WORD();
|
|
envelope[0][1] = DSP4_READ_WORD();
|
|
envelope[1][0] = DSP4_READ_WORD();
|
|
envelope[1][1] = DSP4_READ_WORD();
|
|
|
|
// starting base values to project from
|
|
poly_start[0] = view_x[0];
|
|
poly_start[1] = view_x[1];
|
|
|
|
// starting raster lines to begin drawing
|
|
poly_raster[0][0] = view_y[0];
|
|
poly_raster[0][1] = view_y[0];
|
|
poly_raster[1][0] = view_y[1];
|
|
poly_raster[1][1] = view_y[1];
|
|
|
|
// starting distances
|
|
poly_plane[0] = distance;
|
|
poly_plane[1] = distance;
|
|
|
|
// SR = 0x00
|
|
|
|
// re-center coordinates
|
|
win_left = poly_cx[0][0] - view_x[0] + envelope[0][0];
|
|
win_right = poly_cx[0][1] - view_x[0] + envelope[0][1];
|
|
|
|
// saturate offscreen data for polygon #1
|
|
if (win_left < poly_clipLf[0][0])
|
|
{
|
|
win_left = poly_clipLf[0][0];
|
|
}
|
|
if (win_left > poly_clipRt[0][0])
|
|
{
|
|
win_left = poly_clipRt[0][0];
|
|
}
|
|
if (win_right < poly_clipLf[0][1])
|
|
{
|
|
win_right = poly_clipLf[0][1];
|
|
}
|
|
if (win_right > poly_clipRt[0][1])
|
|
{
|
|
win_right = poly_clipRt[0][1];
|
|
}
|
|
|
|
// SR = 0x80
|
|
|
|
// initial output for polygon #1
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_BYTE(win_left & 0xff);
|
|
DSP4_WRITE_BYTE(win_right & 0xff);
|
|
|
|
|
|
do
|
|
{
|
|
int16 polygon;
|
|
////////////////////////////////////////////////////
|
|
// command check
|
|
|
|
// scan next command
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(1) resume1 :
|
|
|
|
// terminate op
|
|
distance = DSP4_READ_WORD();
|
|
if (distance == -0x8000)
|
|
break;
|
|
|
|
// already have 2 bytes in queue
|
|
DSP4.in_count = 16;
|
|
|
|
DSP4_WAIT(2) resume2 :
|
|
|
|
// look at guidelines for both polygon shapes
|
|
view_x[0] = DSP4_READ_WORD();
|
|
view_y[0] = DSP4_READ_WORD();
|
|
view_x[1] = DSP4_READ_WORD();
|
|
view_y[1] = DSP4_READ_WORD();
|
|
|
|
// envelope shaping guidelines (one frame only)
|
|
envelope[0][0] = DSP4_READ_WORD();
|
|
envelope[0][1] = DSP4_READ_WORD();
|
|
envelope[1][0] = DSP4_READ_WORD();
|
|
envelope[1][1] = DSP4_READ_WORD();
|
|
|
|
////////////////////////////////////////////////////
|
|
// projection begins
|
|
|
|
// init
|
|
DSP4_CLEAR_OUT();
|
|
|
|
|
|
//////////////////////////////////////////////
|
|
// solid polygon renderer - 2 shapes
|
|
|
|
for (polygon = 0; polygon < 2; polygon++)
|
|
{
|
|
int32 left_inc, right_inc;
|
|
int16 x1_final, x2_final;
|
|
int16 env[2][2];
|
|
int16 poly;
|
|
|
|
// SR = 0x00
|
|
|
|
// # raster lines to draw
|
|
segments = poly_raster[polygon][0] - view_y[polygon];
|
|
|
|
// prevent overdraw
|
|
if (segments > 0)
|
|
{
|
|
// bump drawing cursor
|
|
poly_raster[polygon][0] = view_y[polygon];
|
|
poly_raster[polygon][1] = view_y[polygon];
|
|
}
|
|
else
|
|
segments = 0;
|
|
|
|
// don't draw outside the window
|
|
if (view_y[polygon] < poly_top[polygon][0])
|
|
{
|
|
segments = 0;
|
|
|
|
// flush remaining raster lines
|
|
if (view_y[polygon] >= poly_top[polygon][0])
|
|
segments = view_y[polygon] - poly_top[polygon][0];
|
|
}
|
|
|
|
// SR = 0x80
|
|
|
|
// tell user how many raster structures to read in
|
|
DSP4_WRITE_WORD(segments);
|
|
|
|
// normal parameters
|
|
poly = polygon;
|
|
|
|
/////////////////////////////////////////////////////
|
|
|
|
// scan next command if no SR check needed
|
|
if (segments)
|
|
{
|
|
int32 win_left, win_right;
|
|
|
|
// road turnoff selection
|
|
if( (uint16) envelope[ polygon ][ 0 ] == (uint16) 0xc001 )
|
|
poly = 1;
|
|
else if( envelope[ polygon ][ 1 ] == 0x3fff )
|
|
poly = 1;
|
|
|
|
///////////////////////////////////////////////
|
|
// left side of polygon
|
|
|
|
// perspective correction on additional shaping parameters
|
|
env[0][0] = envelope[polygon][0] * poly_plane[poly] >> 15;
|
|
env[0][1] = envelope[polygon][0] * distance >> 15;
|
|
|
|
// project new shapes (left side)
|
|
x1_final = view_x[poly] + env[0][0];
|
|
x2_final = poly_start[poly] + env[0][1];
|
|
|
|
// interpolate between projected points with shaping
|
|
left_inc = (x2_final - x1_final) * DSP4_Inverse(segments) << 1;
|
|
if (segments == 1)
|
|
left_inc = -left_inc;
|
|
|
|
///////////////////////////////////////////////
|
|
// right side of polygon
|
|
|
|
// perspective correction on additional shaping parameters
|
|
env[1][0] = envelope[polygon][1] * poly_plane[poly] >> 15;;
|
|
env[1][1] = envelope[polygon][1] * distance >> 15;
|
|
|
|
// project new shapes (right side)
|
|
x1_final = view_x[poly] + env[1][0];
|
|
x2_final = poly_start[poly] + env[1][1];
|
|
|
|
|
|
// interpolate between projected points with shaping
|
|
right_inc = (x2_final - x1_final) * DSP4_Inverse(segments) << 1;
|
|
if (segments == 1)
|
|
right_inc = -right_inc;
|
|
|
|
///////////////////////////////////////////////
|
|
// update each point on the line
|
|
|
|
win_left = SEX16(poly_cx[polygon][0] - poly_start[poly] + env[0][0]);
|
|
win_right = SEX16(poly_cx[polygon][1] - poly_start[poly] + env[1][0]);
|
|
|
|
// update distance drawn into world
|
|
poly_plane[polygon] = distance;
|
|
|
|
// rasterize line
|
|
for (lcv = 0; lcv < segments; lcv++)
|
|
{
|
|
int16 x_left, x_right;
|
|
|
|
// project new coordinates
|
|
win_left += left_inc;
|
|
win_right += right_inc;
|
|
|
|
// grab integer portion, drop fraction (no rounding)
|
|
x_left = win_left >> 16;
|
|
x_right = win_right >> 16;
|
|
|
|
// saturate offscreen data
|
|
if (x_left < poly_clipLf[polygon][0])
|
|
x_left = poly_clipLf[polygon][0];
|
|
if (x_left > poly_clipRt[polygon][0])
|
|
x_left = poly_clipRt[polygon][0];
|
|
if (x_right < poly_clipLf[polygon][1])
|
|
x_right = poly_clipLf[polygon][1];
|
|
if (x_right > poly_clipRt[polygon][1])
|
|
x_right = poly_clipRt[polygon][1];
|
|
|
|
// 1. HDMA memory pointer
|
|
// 2. Left window position ($2126/$2128)
|
|
// 3. Right window position ($2127/$2129)
|
|
|
|
DSP4_WRITE_WORD(poly_ptr[polygon][0]);
|
|
DSP4_WRITE_BYTE(x_left & 0xff);
|
|
DSP4_WRITE_BYTE(x_right & 0xff);
|
|
|
|
|
|
// update memory pointers
|
|
poly_ptr[polygon][0] -= 4;
|
|
poly_ptr[polygon][1] -= 4;
|
|
} // end rasterize line
|
|
}
|
|
|
|
////////////////////////////////////////////////
|
|
// Post-update
|
|
|
|
// new projection spot to continue rasterizing from
|
|
poly_start[polygon] = view_x[poly];
|
|
} // end polygon rasterizer
|
|
}
|
|
while (1);
|
|
|
|
// unknown output
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_WORD(0);
|
|
|
|
|
|
DSP4.waiting4command = TRUE;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
void DSP4_OP09()
|
|
{
|
|
DSP4.waiting4command = FALSE;
|
|
|
|
// op flow control
|
|
switch (DSP4_Logic)
|
|
{
|
|
case 1:
|
|
goto resume1; break;
|
|
case 2:
|
|
goto resume2; break;
|
|
case 3:
|
|
goto resume3; break;
|
|
case 4:
|
|
goto resume4; break;
|
|
case 5:
|
|
goto resume5; break;
|
|
case 6:
|
|
goto resume6; break;
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// process initial inputs
|
|
|
|
// grab screen information
|
|
viewport_cx = DSP4_READ_WORD();
|
|
viewport_cy = DSP4_READ_WORD();
|
|
DSP4_READ_WORD(); // 0x0000
|
|
viewport_left = DSP4_READ_WORD();
|
|
viewport_right = DSP4_READ_WORD();
|
|
viewport_top = DSP4_READ_WORD();
|
|
viewport_bottom = DSP4_READ_WORD();
|
|
|
|
// starting raster line below the horizon
|
|
poly_bottom[0][0] = viewport_bottom - viewport_cy;
|
|
poly_raster[0][0] = 0x100;
|
|
|
|
do
|
|
{
|
|
////////////////////////////////////////////////////
|
|
// check for new sprites
|
|
|
|
DSP4.in_count = 4;
|
|
DSP4_WAIT(1) resume1 :
|
|
|
|
////////////////////////////////////////////////
|
|
// raster overdraw check
|
|
|
|
raster = DSP4_READ_WORD();
|
|
|
|
// continue updating the raster line where overdraw begins
|
|
if (raster < poly_raster[0][0])
|
|
{
|
|
sprite_clipy = viewport_bottom - (poly_bottom[0][0] - raster);
|
|
poly_raster[0][0] = raster;
|
|
}
|
|
|
|
/////////////////////////////////////////////////
|
|
// identify sprite
|
|
|
|
// op termination
|
|
distance = DSP4_READ_WORD();
|
|
if (distance == -0x8000)
|
|
goto terminate;
|
|
|
|
|
|
// no sprite
|
|
if (distance == 0x0000)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// process projection information
|
|
|
|
// vehicle sprite
|
|
if ((uint16) distance == 0x9000)
|
|
{
|
|
int16 car_left, car_right, car_back;
|
|
int16 impact_left, impact_back;
|
|
int16 world_spx, world_spy;
|
|
int16 view_spx, view_spy;
|
|
uint16 energy;
|
|
|
|
// we already have 4 bytes we want
|
|
DSP4.in_count = 14;
|
|
DSP4_WAIT(2) resume2 :
|
|
|
|
// filter inputs
|
|
energy = DSP4_READ_WORD();
|
|
impact_back = DSP4_READ_WORD();
|
|
car_back = DSP4_READ_WORD();
|
|
impact_left = DSP4_READ_WORD();
|
|
car_left = DSP4_READ_WORD();
|
|
distance = DSP4_READ_WORD();
|
|
car_right = DSP4_READ_WORD();
|
|
|
|
// calculate car's world (x,y) values
|
|
world_spx = car_right - car_left;
|
|
world_spy = car_back;
|
|
|
|
// add in collision vector [needs bit-twiddling]
|
|
world_spx -= energy * (impact_left - car_left) >> 16;
|
|
world_spy -= energy * (car_back - impact_back) >> 16;
|
|
|
|
// perspective correction for world (x,y)
|
|
view_spx = world_spx * distance >> 15;
|
|
view_spy = world_spy * distance >> 15;
|
|
|
|
// convert to screen values
|
|
sprite_x = viewport_cx + view_spx;
|
|
sprite_y = viewport_bottom - (poly_bottom[0][0] - view_spy);
|
|
|
|
// make the car's (x)-coordinate available
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_WORD(world_spx);
|
|
|
|
// grab a few remaining vehicle values
|
|
DSP4.in_count = 4;
|
|
DSP4_WAIT(3) resume3 :
|
|
|
|
// add vertical lift factor
|
|
sprite_y += DSP4_READ_WORD();
|
|
}
|
|
// terrain sprite
|
|
else
|
|
{
|
|
int16 world_spx, world_spy;
|
|
int16 view_spx, view_spy;
|
|
|
|
// we already have 4 bytes we want
|
|
DSP4.in_count = 10;
|
|
DSP4_WAIT(4) resume4 :
|
|
|
|
// sort loop inputs
|
|
poly_cx[0][0] = DSP4_READ_WORD();
|
|
poly_raster[0][1] = DSP4_READ_WORD();
|
|
world_spx = DSP4_READ_WORD();
|
|
world_spy = DSP4_READ_WORD();
|
|
|
|
// compute base raster line from the bottom
|
|
segments = poly_bottom[0][0] - raster;
|
|
|
|
// perspective correction for world (x,y)
|
|
view_spx = world_spx * distance >> 15;
|
|
view_spy = world_spy * distance >> 15;
|
|
|
|
// convert to screen values
|
|
sprite_x = viewport_cx + view_spx - poly_cx[0][0];
|
|
sprite_y = viewport_bottom - segments + view_spy;
|
|
}
|
|
|
|
// default sprite size: 16x16
|
|
sprite_size = 1;
|
|
sprite_attr = DSP4_READ_WORD();
|
|
|
|
////////////////////////////////////////////////////
|
|
// convert tile data to SNES OAM format
|
|
|
|
do
|
|
{
|
|
uint16 header;
|
|
|
|
int16 sp_x, sp_y, sp_attr, sp_dattr;
|
|
int16 sp_dx, sp_dy;
|
|
int16 pixels;
|
|
|
|
bool8 draw;
|
|
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(5) resume5 :
|
|
|
|
draw = TRUE;
|
|
|
|
// opcode termination
|
|
raster = DSP4_READ_WORD();
|
|
if (raster == -0x8000)
|
|
goto terminate;
|
|
|
|
// stop code
|
|
if (raster == 0x0000 && !sprite_size)
|
|
break;
|
|
|
|
// toggle sprite size
|
|
if (raster == 0x0000)
|
|
{
|
|
sprite_size = !sprite_size;
|
|
continue;
|
|
}
|
|
|
|
// check for valid sprite header
|
|
header = raster;
|
|
header >>= 8;
|
|
if (header != 0x20 &&
|
|
header != 0x2e && //This is for attractor sprite
|
|
header != 0x40 &&
|
|
header != 0x60 &&
|
|
header != 0xa0 &&
|
|
header != 0xc0 &&
|
|
header != 0xe0)
|
|
break;
|
|
|
|
// read in rest of sprite data
|
|
DSP4.in_count = 4;
|
|
DSP4_WAIT(6) resume6 :
|
|
|
|
draw = TRUE;
|
|
|
|
/////////////////////////////////////
|
|
// process tile data
|
|
|
|
// sprite deltas
|
|
sp_dattr = raster;
|
|
sp_dy = DSP4_READ_WORD();
|
|
sp_dx = DSP4_READ_WORD();
|
|
|
|
// update coordinates to screen space
|
|
sp_x = sprite_x + sp_dx;
|
|
sp_y = sprite_y + sp_dy;
|
|
|
|
// update sprite nametable/attribute information
|
|
sp_attr = sprite_attr + sp_dattr;
|
|
|
|
// allow partially visibile tiles
|
|
pixels = sprite_size ? 15 : 7;
|
|
|
|
DSP4_CLEAR_OUT();
|
|
|
|
// transparent tile to clip off parts of a sprite (overdraw)
|
|
if (sprite_clipy - pixels <= sp_y &&
|
|
sp_y <= sprite_clipy &&
|
|
sp_x >= viewport_left - pixels &&
|
|
sp_x <= viewport_right &&
|
|
sprite_clipy >= viewport_top - pixels &&
|
|
sprite_clipy <= viewport_bottom)
|
|
{
|
|
DSP4_OP0B(&draw, sp_x, sprite_clipy, 0x00EE, sprite_size, 0);
|
|
}
|
|
|
|
|
|
// normal sprite tile
|
|
if (sp_x >= viewport_left - pixels &&
|
|
sp_x <= viewport_right &&
|
|
sp_y >= viewport_top - pixels &&
|
|
sp_y <= viewport_bottom &&
|
|
sp_y <= sprite_clipy)
|
|
{
|
|
DSP4_OP0B(&draw, sp_x, sp_y, sp_attr, sprite_size, 0);
|
|
}
|
|
|
|
|
|
// no following OAM data
|
|
DSP4_OP0B(&draw, 0, 0x0100, 0, 0, 1);
|
|
}
|
|
while (1);
|
|
}
|
|
while (1);
|
|
|
|
terminate : DSP4.waiting4command = TRUE;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
const uint16 OP0A_Values[16] = { 0x0000, 0x0030, 0x0060, 0x0090, 0x00c0, 0x00f0, 0x0120, 0x0150, 0xfe80,
|
|
0xfeb0, 0xfee0, 0xff10, 0xff40, 0xff70, 0xffa0, 0xffd0 };
|
|
|
|
void DSP4_OP0A(int16 n2, int16 *o1, int16 *o2, int16 *o3, int16 *o4)
|
|
{
|
|
*o4 = OP0A_Values[(n2 & 0x000f)];
|
|
*o3 = OP0A_Values[(n2 & 0x00f0) >> 4];
|
|
*o2 = OP0A_Values[(n2 & 0x0f00) >> 8];
|
|
*o1 = OP0A_Values[(n2 & 0xf000) >> 12];
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
void DSP4_OP0B(bool8 *draw, int16 sp_x, int16 sp_y, int16 sp_attr, bool8 size, bool8 stop)
|
|
{
|
|
int16 Row1, Row2;
|
|
|
|
// SR = 0x00
|
|
|
|
// align to nearest 8-pixel row
|
|
Row1 = (sp_y >> 3) & 0x1f;
|
|
Row2 = (Row1 + 1) & 0x1f;
|
|
|
|
// check boundaries
|
|
if (!((sp_y < 0) || ((sp_y & 0x01ff) < 0x00eb)))
|
|
{
|
|
*draw = 0;
|
|
}
|
|
if (size)
|
|
{
|
|
if (OAM_Row[Row1] + 1 >= OAM_RowMax)
|
|
*draw = 0;
|
|
if (OAM_Row[Row2] + 1 >= OAM_RowMax)
|
|
*draw = 0;
|
|
}
|
|
else
|
|
{
|
|
if (OAM_Row[Row1] >= OAM_RowMax)
|
|
{
|
|
*draw = 0;
|
|
}
|
|
}
|
|
|
|
// emulator fail-safe (unknown if this really exists)
|
|
if (sprite_count >= 128)
|
|
{
|
|
*draw = 0;
|
|
}
|
|
|
|
// SR = 0x80
|
|
|
|
if (*draw)
|
|
{
|
|
// Row tiles
|
|
if (size)
|
|
{
|
|
OAM_Row[Row1] += 2;
|
|
OAM_Row[Row2] += 2;
|
|
}
|
|
else
|
|
{
|
|
OAM_Row[Row1]++;
|
|
}
|
|
|
|
// yield OAM output
|
|
DSP4_WRITE_WORD(1);
|
|
|
|
// pack OAM data: x,y,name,attr
|
|
DSP4_WRITE_BYTE(sp_x & 0xff);
|
|
DSP4_WRITE_BYTE(sp_y & 0xff);
|
|
DSP4_WRITE_WORD(sp_attr);
|
|
|
|
sprite_count++;
|
|
|
|
// OAM: size,msb data
|
|
// save post-oam table data for future retrieval
|
|
OAM_attr[OAM_index] |= ((sp_x <0 || sp_x> 255) << OAM_bits);
|
|
OAM_bits++;
|
|
|
|
OAM_attr[OAM_index] |= (size << OAM_bits);
|
|
OAM_bits++;
|
|
|
|
// move to next byte in buffer
|
|
if (OAM_bits == 16)
|
|
{
|
|
OAM_bits = 0;
|
|
OAM_index++;
|
|
}
|
|
}
|
|
else if (stop)
|
|
{
|
|
// yield no OAM output
|
|
DSP4_WRITE_WORD(0);
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
void DSP4_OP0D()
|
|
{
|
|
DSP4.waiting4command = FALSE;
|
|
|
|
// op flow control
|
|
switch (DSP4_Logic)
|
|
{
|
|
case 1:
|
|
goto resume1; break;
|
|
case 2:
|
|
goto resume2; break;
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// process initial inputs
|
|
|
|
// sort inputs
|
|
world_y = DSP4_READ_DWORD();
|
|
poly_bottom[0][0] = DSP4_READ_WORD();
|
|
poly_top[0][0] = DSP4_READ_WORD();
|
|
poly_cx[1][0] = DSP4_READ_WORD();
|
|
viewport_bottom = DSP4_READ_WORD();
|
|
world_x = DSP4_READ_DWORD();
|
|
poly_cx[0][0] = DSP4_READ_WORD();
|
|
poly_ptr[0][0] = DSP4_READ_WORD();
|
|
world_yofs = DSP4_READ_WORD();
|
|
world_dy = DSP4_READ_DWORD();
|
|
world_dx = DSP4_READ_DWORD();
|
|
distance = DSP4_READ_WORD();
|
|
DSP4_READ_WORD(); // 0x0000
|
|
world_xenv = SEX78(DSP4_READ_WORD());
|
|
world_ddy = DSP4_READ_WORD();
|
|
world_ddx = DSP4_READ_WORD();
|
|
view_yofsenv = DSP4_READ_WORD();
|
|
|
|
// initial (x,y,offset) at starting raster line
|
|
view_x1 = (world_x + world_xenv) >> 16;
|
|
view_y1 = world_y >> 16;
|
|
view_xofs1 = world_x >> 16;
|
|
view_yofs1 = world_yofs;
|
|
|
|
// first raster line
|
|
poly_raster[0][0] = poly_bottom[0][0];
|
|
|
|
|
|
do
|
|
{
|
|
////////////////////////////////////////////////////
|
|
// process one iteration of projection
|
|
|
|
// perspective projection of world (x,y,scroll) points
|
|
// based on the current projection lines
|
|
view_x2 = ( ( ( world_x + world_xenv ) >> 16 ) * distance >> 15 ) + ( view_turnoff_x * distance >> 15 );
|
|
view_y2 = (world_y >> 16) * distance >> 15;
|
|
view_xofs2 = view_x2;
|
|
view_yofs2 = (world_yofs * distance >> 15) + poly_bottom[0][0] - view_y2;
|
|
|
|
// 1. World x-location before transformation
|
|
// 2. Viewer x-position at the current
|
|
// 3. World y-location before perspective projection
|
|
// 4. Viewer y-position below the horizon
|
|
// 5. Number of raster lines drawn in this iteration
|
|
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_WORD((world_x + world_xenv) >> 16);
|
|
DSP4_WRITE_WORD(view_x2);
|
|
DSP4_WRITE_WORD(world_y >> 16);
|
|
DSP4_WRITE_WORD(view_y2);
|
|
|
|
//////////////////////////////////////////////////////////
|
|
|
|
// SR = 0x00
|
|
|
|
// determine # of raster lines used
|
|
segments = view_y1 - view_y2;
|
|
|
|
// prevent overdraw
|
|
if (view_y2 >= poly_raster[0][0])
|
|
segments = 0;
|
|
else
|
|
poly_raster[0][0] = view_y2;
|
|
|
|
// don't draw outside the window
|
|
if (view_y2 < poly_top[0][0])
|
|
{
|
|
segments = 0;
|
|
|
|
// flush remaining raster lines
|
|
if (view_y1 >= poly_top[0][0])
|
|
segments = view_y1 - poly_top[0][0];
|
|
}
|
|
|
|
// SR = 0x80
|
|
|
|
DSP4_WRITE_WORD(segments);
|
|
|
|
//////////////////////////////////////////////////////////
|
|
|
|
// scan next command if no SR check needed
|
|
if (segments)
|
|
{
|
|
int32 px_dx, py_dy;
|
|
int32 x_scroll, y_scroll;
|
|
|
|
// SR = 0x00
|
|
|
|
// linear interpolation (lerp) between projected points
|
|
px_dx = (view_xofs2 - view_xofs1) * DSP4_Inverse(segments) << 1;
|
|
py_dy = (view_yofs2 - view_yofs1) * DSP4_Inverse(segments) << 1;
|
|
|
|
// starting step values
|
|
x_scroll = SEX16(poly_cx[0][0] + view_xofs1);
|
|
y_scroll = SEX16(-viewport_bottom + view_yofs1 + view_yofsenv + poly_cx[1][0] - world_yofs);
|
|
|
|
// SR = 0x80
|
|
|
|
// rasterize line
|
|
for (lcv = 0; lcv < segments; lcv++)
|
|
{
|
|
// 1. HDMA memory pointer (bg1)
|
|
// 2. vertical scroll offset ($210E)
|
|
// 3. horizontal scroll offset ($210D)
|
|
|
|
DSP4_WRITE_WORD(poly_ptr[0][0]);
|
|
DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16);
|
|
DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16);
|
|
|
|
|
|
// update memory address
|
|
poly_ptr[0][0] -= 4;
|
|
|
|
// update screen values
|
|
x_scroll += px_dx;
|
|
y_scroll += py_dy;
|
|
}
|
|
}
|
|
|
|
/////////////////////////////////////////////////////
|
|
// Post-update
|
|
|
|
// update new viewer (x,y,scroll) to last raster line drawn
|
|
view_x1 = view_x2;
|
|
view_y1 = view_y2;
|
|
view_xofs1 = view_xofs2;
|
|
view_yofs1 = view_yofs2;
|
|
|
|
// add deltas for projection lines
|
|
world_dx += SEX78(world_ddx);
|
|
world_dy += SEX78(world_ddy);
|
|
|
|
// update projection lines
|
|
world_x += (world_dx + world_xenv);
|
|
world_y += world_dy;
|
|
|
|
////////////////////////////////////////////////////
|
|
// command check
|
|
|
|
// scan next command
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(1) resume1 :
|
|
|
|
// inspect input
|
|
distance = DSP4_READ_WORD();
|
|
|
|
// terminate op
|
|
if (distance == -0x8000)
|
|
break;
|
|
|
|
// already have 2 bytes in queue
|
|
DSP4.in_count = 6;
|
|
DSP4_WAIT(2) resume2:
|
|
|
|
// inspect inputs
|
|
world_ddy = DSP4_READ_WORD();
|
|
world_ddx = DSP4_READ_WORD();
|
|
view_yofsenv = DSP4_READ_WORD();
|
|
|
|
// no envelope here
|
|
world_xenv = 0;
|
|
}
|
|
while (1);
|
|
|
|
DSP4.waiting4command = TRUE;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
|
|
void DSP4_OP0E()
|
|
{
|
|
OAM_RowMax = 16;
|
|
memset(OAM_Row, 0, 64);
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
void DSP4_OP0F()
|
|
{
|
|
DSP4.waiting4command = FALSE;
|
|
|
|
// op flow control
|
|
switch (DSP4_Logic)
|
|
{
|
|
case 1:
|
|
goto resume1; break;
|
|
case 2:
|
|
goto resume2; break;
|
|
case 3:
|
|
goto resume3; break;
|
|
case 4:
|
|
goto resume4; break;
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// process initial inputs
|
|
|
|
// sort inputs
|
|
DSP4_READ_WORD(); // 0x0000
|
|
world_y = DSP4_READ_DWORD();
|
|
poly_bottom[0][0] = DSP4_READ_WORD();
|
|
poly_top[0][0] = DSP4_READ_WORD();
|
|
poly_cx[1][0] = DSP4_READ_WORD();
|
|
viewport_bottom = DSP4_READ_WORD();
|
|
world_x = DSP4_READ_DWORD();
|
|
poly_cx[0][0] = DSP4_READ_WORD();
|
|
poly_ptr[0][0] = DSP4_READ_WORD();
|
|
world_yofs = DSP4_READ_WORD();
|
|
world_dy = DSP4_READ_DWORD();
|
|
world_dx = DSP4_READ_DWORD();
|
|
distance = DSP4_READ_WORD();
|
|
DSP4_READ_WORD(); // 0x0000
|
|
world_xenv = DSP4_READ_DWORD();
|
|
world_ddy = DSP4_READ_WORD();
|
|
world_ddx = DSP4_READ_WORD();
|
|
view_yofsenv = DSP4_READ_WORD();
|
|
|
|
// initial (x,y,offset) at starting raster line
|
|
view_x1 = (world_x + world_xenv) >> 16;
|
|
view_y1 = world_y >> 16;
|
|
view_xofs1 = world_x >> 16;
|
|
view_yofs1 = world_yofs;
|
|
view_turnoff_x = 0;
|
|
view_turnoff_dx = 0;
|
|
|
|
// first raster line
|
|
poly_raster[0][0] = poly_bottom[0][0];
|
|
|
|
|
|
do
|
|
{
|
|
////////////////////////////////////////////////////
|
|
// process one iteration of projection
|
|
|
|
// perspective projection of world (x,y,scroll) points
|
|
// based on the current projection lines
|
|
view_x2 = ((world_x + world_xenv) >> 16) * distance >> 15;
|
|
view_y2 = (world_y >> 16) * distance >> 15;
|
|
view_xofs2 = view_x2;
|
|
view_yofs2 = (world_yofs * distance >> 15) + poly_bottom[0][0] - view_y2;
|
|
|
|
// 1. World x-location before transformation
|
|
// 2. Viewer x-position at the next
|
|
// 3. World y-location before perspective projection
|
|
// 4. Viewer y-position below the horizon
|
|
// 5. Number of raster lines drawn in this iteration
|
|
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_WORD((world_x + world_xenv) >> 16);
|
|
DSP4_WRITE_WORD(view_x2);
|
|
DSP4_WRITE_WORD(world_y >> 16);
|
|
DSP4_WRITE_WORD(view_y2);
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
// SR = 0x00
|
|
|
|
// determine # of raster lines used
|
|
segments = poly_raster[0][0] - view_y2;
|
|
|
|
// prevent overdraw
|
|
if (view_y2 >= poly_raster[0][0])
|
|
segments = 0;
|
|
else
|
|
poly_raster[0][0] = view_y2;
|
|
|
|
// don't draw outside the window
|
|
if (view_y2 < poly_top[0][0])
|
|
{
|
|
segments = 0;
|
|
|
|
// flush remaining raster lines
|
|
if (view_y1 >= poly_top[0][0])
|
|
segments = view_y1 - poly_top[0][0];
|
|
}
|
|
|
|
// SR = 0x80
|
|
|
|
DSP4_WRITE_WORD(segments);
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
// scan next command if no SR check needed
|
|
if (segments)
|
|
{
|
|
int32 px_dx, py_dy;
|
|
int32 x_scroll, y_scroll;
|
|
|
|
for (lcv = 0; lcv < 4; lcv++)
|
|
{
|
|
// grab inputs
|
|
DSP4.in_count = 4;
|
|
DSP4_WAIT(1);
|
|
resume1 :
|
|
for (;;)
|
|
{
|
|
int16 distance;
|
|
int16 color, red, green, blue;
|
|
|
|
distance = DSP4_READ_WORD();
|
|
color = DSP4_READ_WORD();
|
|
|
|
// U1+B5+G5+R5
|
|
red = color & 0x1f;
|
|
green = (color >> 5) & 0x1f;
|
|
blue = (color >> 10) & 0x1f;
|
|
|
|
// dynamic lighting
|
|
red = (red * distance >> 15) & 0x1f;
|
|
green = (green * distance >> 15) & 0x1f;
|
|
blue = (blue * distance >> 15) & 0x1f;
|
|
color = red | (green << 5) | (blue << 10);
|
|
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_WORD(color);
|
|
break;
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
// SR = 0x00
|
|
|
|
// linear interpolation (lerp) between projected points
|
|
px_dx = (view_xofs2 - view_xofs1) * DSP4_Inverse(segments) << 1;
|
|
py_dy = (view_yofs2 - view_yofs1) * DSP4_Inverse(segments) << 1;
|
|
|
|
|
|
// starting step values
|
|
x_scroll = SEX16(poly_cx[0][0] + view_xofs1);
|
|
y_scroll = SEX16(-viewport_bottom + view_yofs1 + view_yofsenv + poly_cx[1][0] - world_yofs);
|
|
|
|
// SR = 0x80
|
|
|
|
// rasterize line
|
|
for (lcv = 0; lcv < segments; lcv++)
|
|
{
|
|
// 1. HDMA memory pointer
|
|
// 2. vertical scroll offset ($210E)
|
|
// 3. horizontal scroll offset ($210D)
|
|
|
|
DSP4_WRITE_WORD(poly_ptr[0][0]);
|
|
DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16);
|
|
DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16);
|
|
|
|
// update memory address
|
|
poly_ptr[0][0] -= 4;
|
|
|
|
// update screen values
|
|
x_scroll += px_dx;
|
|
y_scroll += py_dy;
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// Post-update
|
|
|
|
// update new viewer (x,y,scroll) to last raster line drawn
|
|
view_x1 = view_x2;
|
|
view_y1 = view_y2;
|
|
view_xofs1 = view_xofs2;
|
|
view_yofs1 = view_yofs2;
|
|
|
|
// add deltas for projection lines
|
|
world_dx += SEX78(world_ddx);
|
|
world_dy += SEX78(world_ddy);
|
|
|
|
// update projection lines
|
|
world_x += (world_dx + world_xenv);
|
|
world_y += world_dy;
|
|
|
|
// update road turnoff position
|
|
view_turnoff_x += view_turnoff_dx;
|
|
|
|
////////////////////////////////////////////////////
|
|
// command check
|
|
|
|
// scan next command
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(2) resume2:
|
|
|
|
// check for termination
|
|
distance = DSP4_READ_WORD();
|
|
if (distance == -0x8000)
|
|
break;
|
|
|
|
// road splice
|
|
if( (uint16) distance == 0x8001 )
|
|
{
|
|
DSP4.in_count = 6;
|
|
DSP4_WAIT(3) resume3:
|
|
|
|
distance = DSP4_READ_WORD();
|
|
view_turnoff_x = DSP4_READ_WORD();
|
|
view_turnoff_dx = DSP4_READ_WORD();
|
|
|
|
// factor in new changes
|
|
view_x1 += ( view_turnoff_x * distance >> 15 );
|
|
view_xofs1 += ( view_turnoff_x * distance >> 15 );
|
|
|
|
// update stepping values
|
|
view_turnoff_x += view_turnoff_dx;
|
|
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(2)
|
|
}
|
|
|
|
// already have 2 bytes in queue
|
|
DSP4.in_count = 6;
|
|
DSP4_WAIT(4) resume4 :
|
|
|
|
// inspect inputs
|
|
world_ddy = DSP4_READ_WORD();
|
|
world_ddx = DSP4_READ_WORD();
|
|
view_yofsenv = DSP4_READ_WORD();
|
|
|
|
// no envelope here
|
|
world_xenv = 0;
|
|
}
|
|
while (1);
|
|
|
|
// terminate op
|
|
DSP4.waiting4command = TRUE;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
|
|
void DSP4_OP10()
|
|
{
|
|
DSP4.waiting4command = FALSE;
|
|
|
|
// op flow control
|
|
switch (DSP4_Logic)
|
|
{
|
|
case 1:
|
|
goto resume1; break;
|
|
case 2:
|
|
goto resume2; break;
|
|
case 3:
|
|
goto resume3; break;
|
|
}
|
|
|
|
////////////////////////////////////////////////////
|
|
// sort inputs
|
|
|
|
DSP4_READ_WORD(); // 0x0000
|
|
world_y = DSP4_READ_DWORD();
|
|
poly_bottom[0][0] = DSP4_READ_WORD();
|
|
poly_top[0][0] = DSP4_READ_WORD();
|
|
poly_cx[1][0] = DSP4_READ_WORD();
|
|
viewport_bottom = DSP4_READ_WORD();
|
|
world_x = DSP4_READ_DWORD();
|
|
poly_cx[0][0] = DSP4_READ_WORD();
|
|
poly_ptr[0][0] = DSP4_READ_WORD();
|
|
world_yofs = DSP4_READ_WORD();
|
|
distance = DSP4_READ_WORD();
|
|
view_y2 = DSP4_READ_WORD();
|
|
view_dy = DSP4_READ_WORD() * distance >> 15;
|
|
view_x2 = DSP4_READ_WORD();
|
|
view_dx = DSP4_READ_WORD() * distance >> 15;
|
|
view_yofsenv = DSP4_READ_WORD();
|
|
|
|
// initial (x,y,offset) at starting raster line
|
|
view_x1 = world_x >> 16;
|
|
view_y1 = world_y >> 16;
|
|
view_xofs1 = view_x1;
|
|
view_yofs1 = world_yofs;
|
|
|
|
// first raster line
|
|
poly_raster[0][0] = poly_bottom[0][0];
|
|
|
|
do
|
|
{
|
|
////////////////////////////////////////////////////
|
|
// process one iteration of projection
|
|
|
|
// add shaping
|
|
view_x2 += view_dx;
|
|
view_y2 += view_dy;
|
|
|
|
// vertical scroll calculation
|
|
view_xofs2 = view_x2;
|
|
view_yofs2 = (world_yofs * distance >> 15) + poly_bottom[0][0] - view_y2;
|
|
|
|
// 1. Viewer x-position at the next
|
|
// 2. Viewer y-position below the horizon
|
|
// 3. Number of raster lines drawn in this iteration
|
|
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_WORD(view_x2);
|
|
DSP4_WRITE_WORD(view_y2);
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
// SR = 0x00
|
|
|
|
// determine # of raster lines used
|
|
segments = view_y1 - view_y2;
|
|
|
|
// prevent overdraw
|
|
if (view_y2 >= poly_raster[0][0])
|
|
segments = 0;
|
|
else
|
|
poly_raster[0][0] = view_y2;
|
|
|
|
// don't draw outside the window
|
|
if (view_y2 < poly_top[0][0])
|
|
{
|
|
segments = 0;
|
|
|
|
// flush remaining raster lines
|
|
if (view_y1 >= poly_top[0][0])
|
|
segments = view_y1 - poly_top[0][0];
|
|
}
|
|
|
|
// SR = 0x80
|
|
|
|
DSP4_WRITE_WORD(segments);
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
// scan next command if no SR check needed
|
|
if (segments)
|
|
{
|
|
for (lcv = 0; lcv < 4; lcv++)
|
|
{
|
|
// grab inputs
|
|
DSP4.in_count = 4;
|
|
DSP4_WAIT(1);
|
|
resume1 :
|
|
for (;;)
|
|
{
|
|
int16 distance;
|
|
int16 color, red, green, blue;
|
|
|
|
distance = DSP4_READ_WORD();
|
|
color = DSP4_READ_WORD();
|
|
|
|
// U1+B5+G5+R5
|
|
red = color & 0x1f;
|
|
green = (color >> 5) & 0x1f;
|
|
blue = (color >> 10) & 0x1f;
|
|
|
|
// dynamic lighting
|
|
red = (red * distance >> 15) & 0x1f;
|
|
green = (green * distance >> 15) & 0x1f;
|
|
blue = (blue * distance >> 15) & 0x1f;
|
|
color = red | (green << 5) | (blue << 10);
|
|
|
|
DSP4_CLEAR_OUT();
|
|
DSP4_WRITE_WORD(color);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////
|
|
|
|
// scan next command if no SR check needed
|
|
if (segments)
|
|
{
|
|
int32 px_dx, py_dy;
|
|
int32 x_scroll, y_scroll;
|
|
|
|
// SR = 0x00
|
|
|
|
// linear interpolation (lerp) between projected points
|
|
px_dx = (view_xofs2 - view_xofs1) * DSP4_Inverse(segments) << 1;
|
|
py_dy = (view_yofs2 - view_yofs1) * DSP4_Inverse(segments) << 1;
|
|
|
|
// starting step values
|
|
x_scroll = SEX16(poly_cx[0][0] + view_xofs1);
|
|
y_scroll = SEX16(-viewport_bottom + view_yofs1 + view_yofsenv + poly_cx[1][0] - world_yofs);
|
|
|
|
// SR = 0x80
|
|
|
|
// rasterize line
|
|
for (lcv = 0; lcv < segments; lcv++)
|
|
{
|
|
// 1. HDMA memory pointer (bg2)
|
|
// 2. vertical scroll offset ($2110)
|
|
// 3. horizontal scroll offset ($210F)
|
|
|
|
DSP4_WRITE_WORD(poly_ptr[0][0]);
|
|
DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16);
|
|
DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16);
|
|
|
|
// update memory address
|
|
poly_ptr[0][0] -= 4;
|
|
|
|
// update screen values
|
|
x_scroll += px_dx;
|
|
y_scroll += py_dy;
|
|
}
|
|
}
|
|
|
|
/////////////////////////////////////////////////////
|
|
// Post-update
|
|
|
|
// update new viewer (x,y,scroll) to last raster line drawn
|
|
view_x1 = view_x2;
|
|
view_y1 = view_y2;
|
|
view_xofs1 = view_xofs2;
|
|
view_yofs1 = view_yofs2;
|
|
|
|
////////////////////////////////////////////////////
|
|
// command check
|
|
|
|
// scan next command
|
|
DSP4.in_count = 2;
|
|
DSP4_WAIT(2) resume2 :
|
|
|
|
// check for opcode termination
|
|
distance = DSP4_READ_WORD();
|
|
if (distance == -0x8000)
|
|
break;
|
|
|
|
// already have 2 bytes in queue
|
|
DSP4.in_count = 10;
|
|
DSP4_WAIT(3) resume3 :
|
|
|
|
|
|
// inspect inputs
|
|
view_y2 = DSP4_READ_WORD();
|
|
view_dy = DSP4_READ_WORD() * distance >> 15;
|
|
view_x2 = DSP4_READ_WORD();
|
|
view_dx = DSP4_READ_WORD() * distance >> 15;
|
|
}
|
|
while (1);
|
|
|
|
DSP4.waiting4command = TRUE;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////
|
|
|
|
void DSP4_OP11(int16 A, int16 B, int16 C, int16 D, int16 *M)
|
|
{
|
|
// 0x155 = 341 = Horizontal Width of the Screen
|
|
*M = ((A * 0x0155 >> 2) & 0xf000) |
|
|
((B * 0x0155 >> 6) & 0x0f00) |
|
|
((C * 0x0155 >> 10) & 0x00f0) |
|
|
((D * 0x0155 >> 14) & 0x000f);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/////////////////////////////////////////////////////////////
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//Processing Code
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/////////////////////////////////////////////////////////////
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uint8 dsp4_byte;
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uint16 dsp4_address;
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void InitDSP4()
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{
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memset(&DSP4, 0, sizeof(DSP4));
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DSP4.waiting4command = TRUE;
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}
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void DSP4_SetByte()
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{
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// clear pending read
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if (DSP4.out_index < DSP4.out_count)
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{
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DSP4.out_index++;
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return;
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}
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if (DSP4.waiting4command)
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{
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if (DSP4.half_command)
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{
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DSP4.command |= (dsp4_byte << 8);
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DSP4.in_index = 0;
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DSP4.waiting4command = FALSE;
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DSP4.half_command = FALSE;
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DSP4.out_count = 0;
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DSP4.out_index = 0;
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DSP4_Logic = 0;
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switch (DSP4.command)
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{
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case 0x0000:
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DSP4.in_count = 4; break;
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case 0x0001:
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DSP4.in_count = 44; break;
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case 0x0003:
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DSP4.in_count = 0; break;
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case 0x0005:
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DSP4.in_count = 0; break;
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case 0x0006:
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DSP4.in_count = 0; break;
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case 0x0007:
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DSP4.in_count = 34; break;
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case 0x0008:
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DSP4.in_count = 90; break;
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case 0x0009:
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DSP4.in_count = 14; break;
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case 0x000a:
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DSP4.in_count = 6; break;
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case 0x000b:
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DSP4.in_count = 6; break;
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case 0x000d:
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DSP4.in_count = 42; break;
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case 0x000e:
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DSP4.in_count = 0; break;
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case 0x000f:
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DSP4.in_count = 46; break;
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case 0x0010:
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DSP4.in_count = 36; break;
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case 0x0011:
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DSP4.in_count = 8; break;
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default:
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DSP4.waiting4command = TRUE;
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break;
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}
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}
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else
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{
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DSP4.command = dsp4_byte;
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DSP4.half_command = TRUE;
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}
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}
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else
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{
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DSP4.parameters[DSP4.in_index] = dsp4_byte;
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DSP4.in_index++;
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}
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if (!DSP4.waiting4command && DSP4.in_count == DSP4.in_index)
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{
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// Actually execute the command
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DSP4.waiting4command = TRUE;
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DSP4.out_index = 0;
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DSP4.in_index = 0;
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switch (DSP4.command)
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{
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// 16-bit multiplication
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case 0x0000:
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{
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int16 multiplier, multiplicand;
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int32 product;
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multiplier = DSP4_READ_WORD();
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multiplicand = DSP4_READ_WORD();
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DSP4_Multiply(multiplicand, multiplier, &product);
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DSP4_CLEAR_OUT();
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DSP4_WRITE_WORD(product);
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DSP4_WRITE_WORD(product >> 16);
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}
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break;
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// single-player track projection
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case 0x0001:
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DSP4_OP01(); break;
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// single-player selection
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case 0x0003:
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DSP4_OP03(); break;
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// clear OAM
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case 0x0005:
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DSP4_OP05(); break;
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// transfer OAM
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case 0x0006:
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DSP4_OP06(); break;
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// single-player track turnoff projection
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case 0x0007:
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DSP4_OP07(); break;
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// solid polygon projection
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case 0x0008:
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DSP4_OP08(); break;
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// sprite projection
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case 0x0009:
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DSP4_OP09(); break;
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// unknown
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case 0x000A:
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{
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//int16 in1a = DSP4_READ_WORD();
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int16 in2a = DSP4_READ_WORD();
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//int16 in3a = DSP4_READ_WORD();
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int16 out1a, out2a, out3a, out4a;
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DSP4_OP0A(in2a, &out2a, &out1a, &out4a, &out3a);
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DSP4_CLEAR_OUT();
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DSP4_WRITE_WORD(out1a);
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DSP4_WRITE_WORD(out2a);
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DSP4_WRITE_WORD(out3a);
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DSP4_WRITE_WORD(out4a);
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}
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break;
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// set OAM
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case 0x000B:
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{
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int16 sp_x = DSP4_READ_WORD();
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int16 sp_y = DSP4_READ_WORD();
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int16 sp_attr = DSP4_READ_WORD();
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bool8 draw = 1;
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DSP4_CLEAR_OUT();
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DSP4_OP0B(&draw, sp_x, sp_y, sp_attr, 0, 1);
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}
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break;
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// multi-player track projection
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case 0x000D:
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DSP4_OP0D(); break;
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// multi-player selection
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case 0x000E:
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DSP4_OP0E(); break;
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// single-player track projection with lighting
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case 0x000F:
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DSP4_OP0F(); break;
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// single-player track turnoff projection with lighting
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case 0x0010:
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DSP4_OP10(); break;
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// unknown: horizontal mapping command
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case 0x0011:
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{
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int16 a, b, c, d, m;
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d = DSP4_READ_WORD();
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c = DSP4_READ_WORD();
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b = DSP4_READ_WORD();
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a = DSP4_READ_WORD();
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DSP4_OP11(a, b, c, d, &m);
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DSP4_CLEAR_OUT();
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DSP4_WRITE_WORD(m);
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break;
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}
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default:
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break;
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}
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}
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}
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void DSP4_GetByte()
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{
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if (DSP4.out_count)
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{
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dsp4_byte = (uint8) DSP4.output[DSP4.out_index&0x1FF];
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DSP4.out_index++;
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if (DSP4.out_count == DSP4.out_index)
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DSP4.out_count = 0;
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}
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else
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{
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dsp4_byte = 0xff;
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}
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}
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