text: /*******************************************************************************
    Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
   
    (c) Copyright 1996 - 2003 Gary Henderson (gary.henderson@ntlworld.com) and
                              Jerremy Koot (jkoot@snes9x.com)
  
    (c) Copyright 2002 - 2003 Matthew Kendora and
                              Brad Jorsch (anomie@users.sourceforge.net)
   
  
                        
    C4 x86 assembler and some C emulation code
    (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
                              _Demo_ (_demo_@zsnes.com), and
                              Nach (n-a-c-h@users.sourceforge.net)
                                            
    C4 C++ code
    (c) Copyright 2003 Brad Jorsch
  
    DSP-1 emulator code
    (c) Copyright 1998 - 2003 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
                              John Weidman (jweidman@slip.net),
                              neviksti (neviksti@hotmail.com), and
                              Kris Bleakley (stinkfish@bigpond.com)
   
    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 - 2003 zsKnight, pagefault (pagefault@zsnes.com)
    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-RTC C emulator code
    (c) Copyright 2001 John Weidman
    
    Super FX x86 assembler emulator code 
    (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 
  
    Super FX C emulator code 
    (c) Copyright 1997 - 1999 Ivar and Gary Henderson.
  
  
  
   
    Specific ports contains the works of other authors. See headers in
    individual files.
   
    Snes9x homepage: http://www.snes9x.com
   
    Permission to use, copy, modify and distribute Snes9x in both binary and
    source form, for non-commercial purposes, is hereby granted without fee,
    providing that this license information and copyright notice appear with
    all copies and any derived work.
   
    This software is provided 'as-is', without any express or implied
    warranty. In no event shall the authors be held liable for any damages
    arising from the use of this software.
   
    Snes9x is freeware for PERSONAL USE only. Commercial users should
    seek permission of the copyright holders first. Commercial use includes
    charging money for Snes9x or software derived from Snes9x.
   
    The copyright holders request that bug fixes and improvements to the code
    should be forwarded to them so everyone can benefit from the modifications
    in future versions.
   
    Super NES and Super Nintendo Entertainment System are trademarks of
    Nintendo Co., Limited and its subsidiary companies.
  *******************************************************************************/
  
  #ifndef __GP32__
  #include <stdlib.h>
  #endif
  
  #include <math.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
  
  