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-/*******************************************************************************
- Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
-
- (c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
- Jerremy Koot (jkoot@snes9x.com)
-
- (c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)
-
- (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
- funkyass (funkyass@spam.shaw.ca),
- Joel Yliluoma (http://iki.fi/bisqwit/)
- Kris Bleakley (codeviolation@hotmail.com),
- Matthew Kendora,
- Nach (n-a-c-h@users.sourceforge.net),
- Peter Bortas (peter@bortas.org) and
- zones (kasumitokoduck@yahoo.com)
-
- C4 x86 assembler and some C emulation code
- (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
- _Demo_ (_demo_@zsnes.com), and Nach
-
- C4 C++ code
- (c) Copyright 2003 Brad Jorsch
-
- DSP-1 emulator code
- (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
- John Weidman, neviksti (neviksti@hotmail.com),
- Kris Bleakley, Andreas Naive
-
- DSP-2 emulator code
- (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
- Lord Nightmare (lord_nightmare@users.sourceforge.net
-
- OBC1 emulator code
- (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
- Kris Bleakley
- Ported from x86 assembler to C by sanmaiwashi
-
- SPC7110 and RTC C++ emulator code
- (c) Copyright 2002 Matthew Kendora with research by
- zsKnight, John Weidman, and Dark Force
-
- S-DD1 C emulator code
- (c) Copyright 2003 Brad Jorsch with research by
- Andreas Naive and John Weidman
-
- S-RTC C emulator code
- (c) Copyright 2001 John Weidman
-
- ST010 C++ emulator code
- (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
-
- Super FX x86 assembler emulator code
- (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault
-
- Super FX C emulator code
- (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
-
-
- SH assembler code partly based on x86 assembler code
- (c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
-
-
- Specific ports contains the works of other authors. See headers in
- individual files.
-
- Snes9x homepage: http://www.snes9x.com
-
- Permission to use, copy, modify and distribute Snes9x in both binary and
- source form, for non-commercial purposes, is hereby granted without fee,
- providing that this license information and copyright notice appear with
- all copies and any derived work.
-
- This software is provided 'as-is', without any express or implied
- warranty. In no event shall the authors be held liable for any damages
- arising from the use of this software.
-
- Snes9x is freeware for PERSONAL USE only. Commercial users should
- seek permission of the copyright holders first. Commercial use includes
- charging money for Snes9x or software derived from Snes9x.
-
- The copyright holders request that bug fixes and improvements to the code
- should be forwarded to them so everyone can benefit from the modifications
- in future versions.
-
- Super NES and Super Nintendo Entertainment System are trademarks of
- Nintendo Co., Limited and its subsidiary companies.
-*******************************************************************************/
-#include <math.h>
-#include <stdlib.h>
-#include "c4.h"
-#include "memmap.h"
-extern "C" {
-
-short C4WFXVal;
-short C4WFYVal;
-short C4WFZVal;
-short C4WFX2Val;
-short C4WFY2Val;
-short C4WFDist;
-short C4WFScale;
-
-static double tanval;
-static double c4x, c4y, c4z;
-static double c4x2, c4y2, c4z2;
-
-void C4TransfWireFrame ()
-{
- c4x = (double) C4WFXVal;
- c4y = (double) C4WFYVal;
- c4z = (double) C4WFZVal - 0x95;
-
- // Rotate X
- tanval = -(double) C4WFX2Val * 3.14159265 * 2 / 128;
- c4y2 = c4y * cos (tanval) - c4z * sin (tanval);
- c4z2 = c4y * sin (tanval) + c4z * cos (tanval);
-
- // Rotate Y
- tanval = -(double)C4WFY2Val*3.14159265*2/128;
- c4x2 = c4x * cos (tanval) + c4z2 * sin (tanval);
- c4z = c4x * - sin (tanval) + c4z2 * cos (tanval);
-
- // Rotate Z
- tanval = -(double) C4WFDist * 3.14159265*2 / 128;
- c4x = c4x2 * cos (tanval) - c4y2 * sin (tanval);
- c4y = c4x2 * sin (tanval) + c4y2 * cos (tanval);
-
- // Scale
- C4WFXVal = (short) (c4x*(double)C4WFScale/(0x90*(c4z+0x95))*0x95);
- C4WFYVal = (short) (c4y*(double)C4WFScale/(0x90*(c4z+0x95))*0x95);
-}
-
-void C4TransfWireFrame2 ()
-{
- c4x = (double)C4WFXVal;
- c4y = (double)C4WFYVal;
- c4z = (double)C4WFZVal;
-
- // Rotate X
- tanval = -(double) C4WFX2Val * 3.14159265 * 2 / 128;
- c4y2 = c4y * cos (tanval) - c4z * sin (tanval);
- c4z2 = c4y * sin (tanval) + c4z * cos (tanval);
-
- // Rotate Y
- tanval = -(double) C4WFY2Val * 3.14159265 * 2 / 128;
- c4x2 = c4x * cos (tanval) + c4z2 * sin (tanval);
- c4z = c4x * -sin (tanval) + c4z2 * cos (tanval);
-
- // Rotate Z
- tanval = -(double)C4WFDist * 3.14159265 * 2 / 128;
- c4x = c4x2 * cos (tanval) - c4y2 * sin (tanval);
- c4y = c4x2 * sin (tanval) + c4y2 * cos (tanval);
-
- // Scale
- C4WFXVal =(short)(c4x * (double)C4WFScale / 0x100);
- C4WFYVal =(short)(c4y * (double)C4WFScale / 0x100);
-}
-
-void C4CalcWireFrame ()
-{
- C4WFXVal = C4WFX2Val - C4WFXVal;
- C4WFYVal = C4WFY2Val - C4WFYVal;
- if (abs (C4WFXVal) > abs (C4WFYVal))
- {
- C4WFDist = abs (C4WFXVal) + 1;
- C4WFYVal = (short) (256 * (double) C4WFYVal / abs (C4WFXVal));
- if (C4WFXVal < 0)
- C4WFXVal = -256;
- else
- C4WFXVal = 256;
- }
- else
- {
- if (C4WFYVal != 0)
- {
- C4WFDist = abs(C4WFYVal)+1;
- C4WFXVal = (short) (256 * (double)C4WFXVal / abs (C4WFYVal));
- if (C4WFYVal < 0)
- C4WFYVal = -256;
- else
- C4WFYVal = 256;
- }
- else
- C4WFDist = 0;
- }
-}
-
-short C41FXVal;
-short C41FYVal;
-short C41FAngleRes;
-short C41FDist;
-short C41FDistVal;
-
-void C4Op1F ()
-{
- if (C41FXVal == 0)
- {
- if (C41FYVal > 0)
- C41FAngleRes = 0x80;
- else
- C41FAngleRes = 0x180;
- }
- else
- {
- tanval = (double) C41FYVal / C41FXVal;
- C41FAngleRes = (short) (atan (tanval) / (3.141592675 * 2) * 512);
- C41FAngleRes = C41FAngleRes;
- if (C41FXVal< 0)
- C41FAngleRes += 0x100;
- C41FAngleRes &= 0x1FF;
- }
-}
-
-void C4Op15()
-{
- tanval = sqrt ((double) C41FYVal * C41FYVal + (double) C41FXVal * C41FXVal);
- C41FDist = (short) tanval;
-}
-
-void C4Op0D()
-{
- tanval = sqrt ((double) C41FYVal * C41FYVal + (double) C41FXVal * C41FXVal);
- tanval = C41FDistVal / tanval;
- C41FYVal = (short) (C41FYVal * tanval * 0.99);
- C41FXVal = (short) (C41FXVal * tanval * 0.98);
-}
-
-#ifdef ZSNES_C4
-void C4LoaDMem(char *C4RAM)
-{
- memmove(C4RAM+(READ_WORD(C4RAM+0x1f45)&0x1fff),
- S9xGetMemPointer(READ_3WORD(C4RAM+0x1f40)),
- READ_WORD(C4RAM+0x1f43));
-}
-#endif
-}//end extern C
-
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