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/*
* Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
*
* (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
* Jerremy Koot (jkoot@snes9x.com)
*
* Super FX C emulator code
* (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
* Gary Henderson.
* Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
*
* DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
* C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
* C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
*
* DOS port code 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>
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);
}
}
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