mirror of
https://github.com/dborth/snes9xgx.git
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329 lines
11 KiB
C++
329 lines
11 KiB
C++
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/**********************************************************************************
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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 "ppu.h"
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static uint8 region_map[6][6]={
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{0, 0x01, 0x03, 0x07, 0x0f, 0x1f },
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{0, 0, 0x02, 0x06, 0x0e, 0x1e },
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{0, 0, 0, 0x04, 0x0c, 0x1c },
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{0, 0, 0, 0, 0x08, 0x18 },
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{0, 0, 0, 0, 0, 0x10 }
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};
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static inline uint8 CalcWindowMask(int i, uint8 W1, uint8 W2){
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if(!PPU.ClipWindow1Enable[i]){
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if(!PPU.ClipWindow2Enable[i]){
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return 0;
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} else {
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if(!PPU.ClipWindow2Inside[i]) return ~W2;
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return W2;
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}
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} else {
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if(!PPU.ClipWindow2Enable[i]){
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if(!PPU.ClipWindow1Inside[i]) return ~W1;
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return W1;
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} else {
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if(!PPU.ClipWindow1Inside[i]) W1=~W1;
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if(!PPU.ClipWindow2Inside[i]) W2=~W2;
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switch(PPU.ClipWindowOverlapLogic[i]){
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case 0: // OR
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return W1|W2;
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case 1: // AND
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return W1&W2;
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case 2: // XOR
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return W1^W2;
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case 3: // XNOR
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return ~(W1^W2);
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}
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}
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}
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// Never get here
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return 0;
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}
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static inline void StoreWindowRegions(uint8 Mask, struct ClipData *Clip, int n_regions, int16 *windows, uint8 *drawing_modes, bool8 sub, bool8 StoreMode0=FALSE){
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int ct=0;
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for(int j=0; j<n_regions; j++){
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int DrawMode=drawing_modes[j];
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if(sub) DrawMode|=1;
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if((Mask&(1<<j))) DrawMode=0;
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if(!StoreMode0 && !DrawMode) continue;
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if(ct>0 && Clip->Right[ct-1]==windows[j] && Clip->DrawMode[ct-1]==DrawMode){
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// This region borders with and has the same drawing mode as the
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// previous region: merge them.
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Clip->Right[ct-1]=windows[j+1];
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} else {
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// Add a new region to the BG
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Clip->Left[ct]=windows[j];
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Clip->Right[ct]=windows[j+1];
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Clip->DrawMode[ct]=DrawMode;
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ct++;
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}
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}
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Clip->Count=ct;
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}
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void ComputeClipWindows () {
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int16 windows[6]={0,256,256,256,256,256};
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uint8 drawing_modes[5]={0,0,0,0,0};
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int n_regions=1;
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int i, j;
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// Calculate window regions. We have at most 5 regions, because we have 6
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// control points (screen edges, window 1 left & right, and window 2 left &
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// right).
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if(PPU.Window1Left<=PPU.Window1Right){
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if(PPU.Window1Left>0){
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windows[2]=256;
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windows[1]=PPU.Window1Left;
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n_regions=2;
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}
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if(PPU.Window1Right<255){
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windows[n_regions+1]=256;
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windows[n_regions]=PPU.Window1Right+1;
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n_regions++;
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}
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}
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if(PPU.Window2Left<=PPU.Window2Right){
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for(i=0; i<=n_regions; i++){
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if(PPU.Window2Left==windows[i]) break;
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if(PPU.Window2Left<windows[i]){
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for(j=n_regions; j>=i; j--){
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windows[j+1]=windows[j];
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}
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windows[i]=PPU.Window2Left;
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n_regions++;
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break;
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}
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}
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for(; i<=n_regions; i++){
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if(PPU.Window2Right+1==windows[i]) break;
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if(PPU.Window2Right+1<windows[i]){
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for(j=n_regions; j>=i; j--){
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windows[j+1]=windows[j];
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}
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windows[i]=PPU.Window2Right+1;
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n_regions++;
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break;
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}
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}
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}
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// Get a bitmap of which regions correspond to each window.
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uint8 W1, W2;
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if(PPU.Window1Left<=PPU.Window1Right){
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for(i=0; windows[i]!=PPU.Window1Left; i++);
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for(j=i; windows[j]!=PPU.Window1Right+1; j++);
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W1=region_map[i][j];
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} else {
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W1=0;
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}
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if(PPU.Window2Left<=PPU.Window2Right){
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for(i=0; windows[i]!=PPU.Window2Left; i++);
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for(j=i; windows[j]!=PPU.Window2Right+1; j++);
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W2=region_map[i][j];
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} else {
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W2=0;
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}
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// Color Window affects the drawing mode for each region. Modes are: 3=Draw
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// as normal, 2=clip color (math only), 1=no math (draw only), 0=nothing.
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uint8 CW_color=0, CW_math=0;
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uint8 CW=CalcWindowMask(5,W1,W2);
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switch(Memory.FillRAM[0x2130]&0xc0){
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case 0x00:
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CW_color=0;
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break;
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case 0x40:
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CW_color=~CW;
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break;
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case 0x80:
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CW_color=CW;
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break;
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case 0xc0:
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CW_color=0xff;
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break;
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}
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switch(Memory.FillRAM[0x2130]&0x30){
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case 0x00:
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CW_math=0;
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break;
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case 0x10:
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CW_math=~CW;
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break;
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case 0x20:
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CW_math=CW;
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break;
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case 0x30:
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CW_math=0xff;
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break;
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}
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for(i=0; i<n_regions; i++){
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if(!(CW_color&(1<<i))) drawing_modes[i]|=1;
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if(!(CW_math&(1<<i))) drawing_modes[i]|=2;
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}
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// Store backdrop clip window (draw everywhere color window allows)
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StoreWindowRegions(0, &IPPU.Clip[0][5], n_regions, windows, drawing_modes, FALSE, TRUE);
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StoreWindowRegions(0, &IPPU.Clip[1][5], n_regions, windows, drawing_modes, TRUE, TRUE);
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// Store per-BG and OBJ clip windows
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for(j=0; j<5; j++){
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uint8 W=Settings.DisableGraphicWindows?0:CalcWindowMask(j,W1,W2);
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for(int sub=0; sub<2; sub++){
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if(Memory.FillRAM[sub+0x212e]&(1<<j)){
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StoreWindowRegions(W, &IPPU.Clip[sub][j], n_regions, windows, drawing_modes, sub);
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} else {
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StoreWindowRegions(0, &IPPU.Clip[sub][j], n_regions, windows, drawing_modes, sub);
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}
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}
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}
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}
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