path: root/src/c4emu.c

/*******************************************************************************
  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.

  (c) Copyright 2014 - 2016 Daniel De Matteis. (UNDER NO CIRCUMSTANCE 
  WILL COMMERCIAL RIGHTS EVER BE APPROPRIATED TO ANY PARTY)


  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__
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#endif

#include <math.h>
#include "snes9x.h"
#include "sar.h"
#include "memmap.h"
#include "ppu.h"
#include "c4.h"

void S9xInitC4()
{
   // Stupid zsnes code, we can't do the logical thing without breaking
   // savestates
   //    Memory.C4RAM = &Memory.FillRAM [0x6000];
   memset(Memory.C4RAM, 0, 0x2000);
}

uint8 S9xGetC4(uint16 Address)
{
   if (Address == 0x7f5e) return 0;
   return (Memory.C4RAM [Address - 0x6000]);
}

static uint8 C4TestPattern [12 * 4] =
{
   0x00, 0x00, 0x00, 0xff,
   0xff, 0xff, 0x00, 0xff,
   0x00, 0x00, 0x00, 0xff,
   0xff, 0xff, 0x00, 0x00,
   0xff, 0xff, 0x00, 0x00,
   0x80, 0xff, 0xff, 0x7f,
   0x00, 0x80, 0x00, 0xff,
   0x7f, 0x00, 0xff, 0x7f,
   0xff, 0x7f, 0xff, 0xff,
   0x00, 0x00, 0x01, 0xff,
   0xff, 0xfe, 0x00, 0x01,
   0x00, 0xff, 0xfe, 0x00
};


static void C4ConvOAM(void)
{
   uint16 globalX, globalY;
   uint8* OAMptr2;
   int16 SprX, SprY;
   uint8 SprName, SprAttr;
   uint8 SprCount;
   uint8* ptr;
   uint8* OAMptr = Memory.C4RAM + (Memory.C4RAM[0x626] << 2);

   /* Clear OAM-to-be */
   for (ptr = Memory.C4RAM + 0x1fd; ptr > OAMptr; ptr -= 4)
      *ptr = 0xe0;

   globalX = READ_WORD(Memory.C4RAM + 0x0621);
   globalY = READ_WORD(Memory.C4RAM + 0x0623);
   OAMptr2 = Memory.C4RAM + 0x200 + (Memory.C4RAM[0x626] >> 2);

   if (Memory.C4RAM[0x0620] != 0)
   {
      int i;
      uint8 *srcptr;
      uint8 offset;

      SprCount = 128 - Memory.C4RAM[0x626];
      offset   = (Memory.C4RAM[0x626] & 3) * 2;
      srcptr   = Memory.C4RAM + 0x220;

      for (i = Memory.C4RAM[0x0620]; i > 0 && SprCount > 0; i--, srcptr += 16)
      {
         uint8 *sprptr;

         SprX    = READ_WORD(srcptr) - globalX;
         SprY    = READ_WORD(srcptr + 2) - globalY;
         SprName = srcptr[5];
         SprAttr = srcptr[4] | srcptr[0x06]; // XXX: mask bits?

         sprptr  = C4GetMemPointer(READ_3WORD(srcptr + 7));

         if (*sprptr != 0)
         {
            int16 X, Y;
            int SprCnt;

            for (SprCnt = *sprptr++; SprCnt > 0 && SprCount > 0; SprCnt--, sprptr += 4)
            {
               X = (int8)sprptr[1];
               if (SprAttr & 0x40) // flip X
                  X = -X - ((sprptr[0] & 0x20) ? 16 : 8);
               X += SprX;
               if (X >= -16 && X <= 272)
               {
                  Y = (int8)sprptr[2];
                  if (SprAttr & 0x80)
                     Y = -Y - ((sprptr[0] & 0x20) ? 16 : 8);
                  Y += SprY;
                  if (Y >= -16 && Y <= 224)
                  {
                     OAMptr[0] = X & 0xff;
                     OAMptr[1] = (uint8)Y;
                     OAMptr[2] = SprName + sprptr[3];
                     OAMptr[3] = SprAttr ^ (sprptr[0] & 0xc0); // XXX: Carry from SprName addition?
                     *OAMptr2 &= ~(3 << offset);
                     if (X & 0x100) *OAMptr2 |= 1 << offset;
                     if (sprptr[0] & 0x20) *OAMptr2 |= 2 << offset;
                     OAMptr += 4;
                     SprCount--;
                     offset = (offset + 2) & 6;
                     if (offset == 0) OAMptr2++;
                  }
               }
            }
         }
         else if (SprCount > 0)
         {
            OAMptr[0] = (uint8)SprX;
            OAMptr[1] = (uint8)SprY;
            OAMptr[2] = SprName;
            OAMptr[3] = SprAttr;
            *OAMptr2 &= ~(3 << offset);
            if (SprX & 0x100) *OAMptr2 |= 3 << offset;
            else *OAMptr2 |= 2 << offset;
            OAMptr += 4;
            SprCount--;
            offset = (offset + 2) & 6;
            if (offset == 0) OAMptr2++;
         }
      }
   }
   // XXX: Copy to OAM? I doubt it.
}

static void C4DoScaleRotate(int row_padding)
{
   uint8 w, h;
   int16 A, B, C, D;
   int32 XScale, YScale;
   int32 Cx, Cy;
   int32 LineX, LineY;
   uint32 X, Y;
   uint8 byte;
   int outidx = 0;
   uint8 bit = 0x80;
   int y;

   // Calculate matrix
   XScale = READ_WORD(Memory.C4RAM + 0x1f8f);
   if (XScale & 0x8000)
      XScale = 0x7fff;
   YScale = READ_WORD(Memory.C4RAM + 0x1f92);
   if (YScale & 0x8000)
      YScale = 0x7fff;

   if (READ_WORD(Memory.C4RAM + 0x1f80) == 0)
   {
      // no rotation
      // XXX: only do this for C and D?
      // XXX: and then only when YScale is 0x1000?
      A = (int16)XScale;
      B = 0;
      C = 0;
      D = (int16)YScale;
   }
   else if (READ_WORD(Memory.C4RAM + 0x1f80) == 128) // 90 degree rotation
   {
      // XXX: Really do this?
      A = 0;
      B = (int16)(-YScale);
      C = (int16)XScale;
      D = 0;
   }
   else if (READ_WORD(Memory.C4RAM + 0x1f80) == 256) // 180 degree rotation
   {
      // XXX: Really do this?
      A = (int16)(-XScale);
      B = 0;
      C = 0;
      D = (int16)(-YScale);
   }
   else if (READ_WORD(Memory.C4RAM + 0x1f80) == 384) // 270 degree rotation
   {
      // XXX: Really do this?
      A = 0;
      B = (int16)YScale;
      C = (int16)(-XScale);
      D = 0;
   }
   else
   {
      A = (int16)SAR16(C4CosTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * XScale, 15);
      B = (int16)(-SAR16(C4SinTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * YScale, 15));
      C = (int16)SAR16(C4SinTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * XScale, 15);
      D = (int16)SAR16(C4CosTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * YScale, 15);
   }

   // Calculate Pixel Resolution
   w = Memory.C4RAM[0x1f89] & ~7;
   h = Memory.C4RAM[0x1f8c] & ~7;

   //    printf("%dx%d XScale=%04x YScale=%04x angle=%03x\n", w, h, XScale, YScale, READ_WORD(Memory.C4RAM+0x1f80)&0x1ff);
   //    printf("Matrix: [%10g %10g]  [%04x %04x]\n", A/4096.0, B/4096.0, A&0xffff, B&0xffff);
   //    printf("        [%10g %10g]  [%04x %04x]\n", C/4096.0, D/4096.0, C&0xffff, D&0xffff);

   // Clear the output RAM
   memset(Memory.C4RAM, 0, (w + row_padding / 4)*h / 2);


   Cx = (int16)READ_WORD(Memory.C4RAM + 0x1f83);
   Cy = (int16)READ_WORD(Memory.C4RAM + 0x1f86);

   // Calculate start position (i.e. (Ox, Oy) = (0, 0))
   // The low 12 bits are fractional, so (Cx<<12) gives us the Cx we want in
   // the function. We do Cx*A etc normally because the matrix parameters
   // already have the fractional parts.
   LineX = (Cx << 12) - Cx * A - Cx * B;
   LineY = (Cy << 12) - Cy * C - Cy * D;

   // Start loop
   for (y = 0; y < h; y++)
   {
      int x;

      X = LineX;
      Y = LineY;

      for (x = 0; x < w; x++)
      {
         if ((X >> 12) >= w || (Y >> 12) >= h)
            byte = 0;
         else
         {
            uint32 addr = (Y >> 12) * w + (X >> 12);
            byte = Memory.C4RAM[0x600 + (addr >> 1)];
            if (addr & 1) byte >>= 4;
         }

         // De-bitplanify
         if (byte & 1) Memory.C4RAM[outidx] |= bit;
         if (byte & 2) Memory.C4RAM[outidx + 1] |= bit;
         if (byte & 4) Memory.C4RAM[outidx + 16] |= bit;
         if (byte & 8) Memory.C4RAM[outidx + 17] |= bit;

         bit >>= 1;
         if (bit == 0)
         {
            bit = 0x80;
            outidx += 32;
         }

         X += A; // Add 1 to output x => add an A and a C
         Y += C;
      }
      outidx += 2 + row_padding;
      if (outidx & 0x10)
         outidx &= ~0x10;
      else
         outidx -= w * 4 + row_padding;
      LineX += B; // Add 1 to output y => add a B and a D
      LineY += D;
   }
}

static void C4DrawLine(int32 X1, int32 Y1, int16 Z1,
                       int32 X2, int32 Y2, int16 Z2, uint8 Color)
{
   int i;

   // Transform coordinates
   C4WFXVal = (short)X1;
   C4WFYVal = (short)Y1;
   C4WFZVal = Z1;
   C4WFScale = Memory.C4RAM[0x1f90];
   C4WFX2Val = Memory.C4RAM[0x1f86];
   C4WFY2Val = Memory.C4RAM[0x1f87];
   C4WFDist = Memory.C4RAM[0x1f88];
   C4TransfWireFrame2();
   X1 = (C4WFXVal + 48) << 8;
   Y1 = (C4WFYVal + 48) << 8;

   C4WFXVal = (short)X2;
   C4WFYVal = (short)Y2;
   C4WFZVal = Z2;
   C4TransfWireFrame2();
   X2 = (C4WFXVal + 48) << 8;
   Y2 = (C4WFYVal + 48) << 8;

   // get line info
   C4WFXVal = (short)(X1 >> 8);
   C4WFYVal = (short)(Y1 >> 8);
   C4WFX2Val = (short)(X2 >> 8);
   C4WFY2Val = (short)(Y2 >> 8);
   C4CalcWireFrame();
   X2 = (int16)C4WFXVal;
   Y2 = (int16)C4WFYVal;

   // render line
   for (i = C4WFDist ? C4WFDist : 1; i > 0; i--)
   {
      //.loop
      if (X1 > 0xff && Y1 > 0xff && X1 < 0x6000 && Y1 < 0x6000)
      {
         uint8 bit;
         uint16 addr = ((X1 & ~0x7ff) + (Y1 & ~0x7ff) * 12 + (Y1 & 0x700)) >> 7;
         addr = (((Y1 >> 8) >> 3) << 8) - (((Y1 >> 8) >> 3) << 6) + (((X1 >> 8) >> 3) << 4) + ((Y1 >> 8) & 7) * 2;
         bit  = 0x80 >> ((X1 >> 8) & 7);
         Memory.C4RAM[addr + 0x300] &= ~bit;
         Memory.C4RAM[addr + 0x301] &= ~bit;
         if (Color & 1) Memory.C4RAM[addr + 0x300] |= bit;
         if (Color & 2) Memory.C4RAM[addr + 0x301] |= bit;
      }
      X1 += X2;
      Y1 += Y2;
   }
}

static void C4DrawWireFrame(void)
{
   uint8* line = C4GetMemPointer(READ_3WORD(Memory.C4RAM + 0x1f80));
   uint8* point1, *point2;
   int16 X1, Y1, Z1;
   int16 X2, Y2, Z2;
   uint8 Color;

   int i;
   for (i = Memory.C4RAM[0x0295]; i > 0; i--, line += 5)
   {
      if (line[0] == 0xff && line[1] == 0xff)
      {
         uint8* tmp = line - 5;
         while (tmp[2] == 0xff && tmp[3] == 0xff) tmp -= 5;
         point1 = C4GetMemPointer((Memory.C4RAM[0x1f82] << 16) | (tmp[2] << 8) | tmp[3]);
      }
      else
         point1 = C4GetMemPointer((Memory.C4RAM[0x1f82] << 16) | (line[0] << 8) | line[1]);
      point2 = C4GetMemPointer((Memory.C4RAM[0x1f82] << 16) | (line[2] << 8) | line[3]);

      X1 = (point1[0] << 8) | point1[1];
      Y1 = (point1[2] << 8) | point1[3];
      Z1 = (point1[4] << 8) | point1[5];
      X2 = (point2[0] << 8) | point2[1];
      Y2 = (point2[2] << 8) | point2[3];
      Z2 = (point2[4] << 8) | point2[5];
      Color = line[4];
      C4DrawLine(X1, Y1, Z1, X2, Y2, Z2, Color);
   }
}

static void C4TransformLines(void)
{
   uint8 *ptr;
   uint8* ptr2;

   C4WFX2Val = Memory.C4RAM[0x1f83];
   C4WFY2Val = Memory.C4RAM[0x1f86];
   C4WFDist = Memory.C4RAM[0x1f89];
   C4WFScale = Memory.C4RAM[0x1f8c];

   // transform vertices
   ptr = Memory.C4RAM;

   {
      int i;
      for (i = READ_WORD(Memory.C4RAM + 0x1f80); i > 0; i--, ptr += 0x10)
      {
         C4WFXVal = READ_WORD(ptr + 1);
         C4WFYVal = READ_WORD(ptr + 5);
         C4WFZVal = READ_WORD(ptr + 9);
         C4TransfWireFrame();

         // displace
         WRITE_WORD(ptr + 1, C4WFXVal + 0x80);
         WRITE_WORD(ptr + 5, C4WFYVal + 0x50);
      }
   }
   WRITE_WORD(Memory.C4RAM + 0x600, 23);
   WRITE_WORD(Memory.C4RAM + 0x602, 0x60);
   WRITE_WORD(Memory.C4RAM + 0x605, 0x40);
   WRITE_WORD(Memory.C4RAM + 0x600 + 8, 23);
   WRITE_WORD(Memory.C4RAM + 0x602 + 8, 0x60);
   WRITE_WORD(Memory.C4RAM + 0x605 + 8, 0x40);

   ptr  = Memory.C4RAM + 0xb02;
   ptr2 = Memory.C4RAM;
   {
      int i;
      for (i = READ_WORD(Memory.C4RAM + 0xb00); i > 0; i--, ptr += 2, ptr2 += 8)
      {
         C4WFXVal = READ_WORD(Memory.C4RAM + (ptr[0] << 4) + 1);
         C4WFYVal = READ_WORD(Memory.C4RAM + (ptr[0] << 4) + 5);
         C4WFX2Val = READ_WORD(Memory.C4RAM + (ptr[1] << 4) + 1);
         C4WFY2Val = READ_WORD(Memory.C4RAM + (ptr[1] << 4) + 5);
         C4CalcWireFrame();
         WRITE_WORD(ptr2 + 0x600, C4WFDist ? C4WFDist : 1);
         WRITE_WORD(ptr2 + 0x602, C4WFXVal);
         WRITE_WORD(ptr2 + 0x605, C4WFYVal);
      }
   }
}
static void C4BitPlaneWave()
{
   static uint16 bmpdata[] =
   {
      0x0000, 0x0002, 0x0004, 0x0006, 0x0008, 0x000A, 0x000C, 0x000E,
      0x0200, 0x0202, 0x0204, 0x0206, 0x0208, 0x020A, 0x020C, 0x020E,
      0x0400, 0x0402, 0x0404, 0x0406, 0x0408, 0x040A, 0x040C, 0x040E,
      0x0600, 0x0602, 0x0604, 0x0606, 0x0608, 0x060A, 0x060C, 0x060E,
      0x0800, 0x0802, 0x0804, 0x0806, 0x0808, 0x080A, 0x080C, 0x080E
   };

   uint8* dst = Memory.C4RAM;
   uint32 waveptr = Memory.C4RAM[0x1f83];
   uint16 mask1 = 0xc0c0;
   uint16 mask2 = 0x3f3f;

   int j;
   for (j = 0; j < 0x10; j++)
   {
      do
      {
         int16 height = -((int8)Memory.C4RAM[waveptr + 0xb00]) - 16;
         int i;
         for (i = 0; i < 40; i++)
         {
            uint16 tmp = READ_WORD(dst + bmpdata[i]) & mask2;
            if (height >= 0)
            {
               if (height < 8)
                  tmp |= mask1 & READ_WORD(Memory.C4RAM + 0xa00 + height * 2);
               else
                  tmp |= mask1 & 0xff00;
            }
            WRITE_WORD(dst + bmpdata[i], tmp);
            height++;
         }
         waveptr = (waveptr + 1) & 0x7f;
         mask1 = (mask1 >> 2) | (mask1 << 6);
         mask2 = (mask2 >> 2) | (mask2 << 6);
      }
      while (mask1 != 0xc0c0);
      dst += 16;

      do
      {
         int16 height = -((int8)Memory.C4RAM[waveptr + 0xb00]) - 16;
         int i;
         for (i = 0; i < 40; i++)
         {
            uint16 tmp = READ_WORD(dst + bmpdata[i]) & mask2;
            if (height >= 0)
            {
               if (height < 8)
                  tmp |= mask1 & READ_WORD(Memory.C4RAM + 0xa10 + height * 2);
               else
                  tmp |= mask1 & 0xff00;
            }
            WRITE_WORD(dst + bmpdata[i], tmp);
            height++;
         }
         waveptr = (waveptr + 1) & 0x7f;
         mask1 = (mask1 >> 2) | (mask1 << 6);
         mask2 = (mask2 >> 2) | (mask2 << 6);
      }
      while (mask1 != 0xc0c0);
      dst += 16;
   }
}

static void C4SprDisintegrate(void)
{
   uint32 y, i;
   uint8 width, height;
   uint32 StartX, StartY;
   uint8* src;
   int32 scaleX, scaleY;
   int32 Cx, Cy;

   width = Memory.C4RAM[0x1f89];
   height = Memory.C4RAM[0x1f8c];
   Cx = (int16)READ_WORD(Memory.C4RAM + 0x1f80);
   Cy = (int16)READ_WORD(Memory.C4RAM + 0x1f83);

   scaleX = (int16)READ_WORD(Memory.C4RAM + 0x1f86);
   scaleY = (int16)READ_WORD(Memory.C4RAM + 0x1f8f);
   StartX = -Cx * scaleX + (Cx << 8);
   StartY = -Cy * scaleY + (Cy << 8);
   src = Memory.C4RAM + 0x600;

   memset(Memory.C4RAM, 0, width * height / 2);

   for (y = StartY, i = 0; i < height; i++, y += scaleY)
   {
      uint32 x, j;
      for (x = StartX, j = 0; j < width; j++, x += scaleX)
      {
         if ((x >> 8) < width && (y >> 8) < height && (y >> 8)*width + (x >> 8) < 0x2000)
         {
            uint8 pixel = (j & 1) ? (*src >> 4) : *src;
            int idx = (y >> 11) * width * 4 + (x >> 11) * 32 + ((y >> 8) & 7) * 2;
            uint8 mask = 0x80 >> ((x >> 8) & 7);
            if (pixel & 1) Memory.C4RAM[idx] |= mask;
            if (pixel & 2) Memory.C4RAM[idx + 1] |= mask;
            if (pixel & 4) Memory.C4RAM[idx + 16] |= mask;
            if (pixel & 8) Memory.C4RAM[idx + 17] |= mask;
         }
         if (j & 1) src++;
      }
   }
}

static void S9xC4ProcessSprites()
{
   switch (Memory.C4RAM[0x1f4d])
   {
   case 0x00: // Build OAM
      C4ConvOAM();
      break;

   case 0x03: // Scale/Rotate
      C4DoScaleRotate(0);
      break;

   case 0x05: // Transform Lines
      C4TransformLines();
      break;

   case 0x07: // Scale/Rotate
      C4DoScaleRotate(64);
      break;

   case 0x08: // Draw wireframe
      C4DrawWireFrame();
      break;

   case 0x0b: // Disintegrate
      C4SprDisintegrate();
      break;

   case 0x0c: // Wave
      C4BitPlaneWave();
      break;

   default:
      break;
   }
}

void S9xSetC4(uint8 byte, uint16 Address)
{
   int i;

   Memory.C4RAM [Address - 0x6000] = byte;
   if (Address == 0x7f4f)
   {
      if (Memory.C4RAM[0x1f4d] == 0x0e && byte < 0x40 && (byte & 3) == 0)
         Memory.C4RAM[0x1f80] = byte >> 2;
      else
      {
         switch (byte)
         {
         case 0x00: // Sprite
            S9xC4ProcessSprites();
            break;

         case 0x01: // Draw wireframe
            memset(Memory.C4RAM + 0x300, 0, 16 * 12 * 3 * 4);
            C4DrawWireFrame();
            break;

         case 0x05: // Propulsion (?)
         {
            int32 tmp = 0x10000;
            if (READ_WORD(Memory.C4RAM + 0x1f83))
               tmp = SAR32((tmp / READ_WORD(Memory.C4RAM + 0x1f83)) * READ_WORD(Memory.C4RAM + 0x1f81), 8);
            WRITE_WORD(Memory.C4RAM + 0x1f80, (uint16)tmp);
         }
         break;

         case 0x0d: // Set vector length
            C41FXVal = READ_WORD(Memory.C4RAM + 0x1f80);
            C41FYVal = READ_WORD(Memory.C4RAM + 0x1f83);
            C41FDistVal = READ_WORD(Memory.C4RAM + 0x1f86);
            C4Op0D();
            WRITE_WORD(Memory.C4RAM + 0x1f89, C41FXVal);
            WRITE_WORD(Memory.C4RAM + 0x1f8c, C41FYVal);
            break;

         case 0x10: // Polar to rectangluar
         {
            int32 tmp = SAR32((int32)READ_WORD(Memory.C4RAM + 0x1f83) * C4CosTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * 2,
                              16);
            WRITE_3WORD(Memory.C4RAM + 0x1f86, tmp);
            tmp = SAR32((int32)READ_WORD(Memory.C4RAM + 0x1f83) * C4SinTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * 2, 16);
            WRITE_3WORD(Memory.C4RAM + 0x1f89, (tmp - SAR32(tmp, 6)));
         }
         break;

         case 0x13: // Polar to rectangluar
         {
            int32 tmp = SAR32((int32)READ_WORD(Memory.C4RAM + 0x1f83) * C4CosTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * 2,
                              8);
            WRITE_3WORD(Memory.C4RAM + 0x1f86, tmp);
            tmp = SAR32((int32)READ_WORD(Memory.C4RAM + 0x1f83) * C4SinTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * 2, 8);
            WRITE_3WORD(Memory.C4RAM + 0x1f89, tmp);
         }
         break;

         case 0x15: // Pythagorean
            C41FXVal = READ_WORD(Memory.C4RAM + 0x1f80);
            C41FYVal = READ_WORD(Memory.C4RAM + 0x1f83);
            C41FDist = (int16)sqrtf((float)C41FXVal * C41FXVal + (float)C41FYVal * C41FYVal);
            WRITE_WORD(Memory.C4RAM + 0x1f80, C41FDist);
            break;

         case 0x1f: // atan
            C41FXVal = READ_WORD(Memory.C4RAM + 0x1f80);
            C41FYVal = READ_WORD(Memory.C4RAM + 0x1f83);
            C4Op1F();
            WRITE_WORD(Memory.C4RAM + 0x1f86, C41FAngleRes);
            break;

         case 0x22: // Trapezoid
         {
            int16 angle1 = READ_WORD(Memory.C4RAM + 0x1f8c) & 0x1ff;
            int16 angle2 = READ_WORD(Memory.C4RAM + 0x1f8f) & 0x1ff;
            int32 tan1 = (C4CosTable[angle1] != 0) ? ((((int32)C4SinTable[angle1]) << 16) / C4CosTable[angle1]) : (int32)0x80000000;
            int32 tan2 = (C4CosTable[angle2] != 0) ? ((((int32)C4SinTable[angle2]) << 16) / C4CosTable[angle2]) : (int32)0x80000000;
            int16 y = READ_WORD(Memory.C4RAM + 0x1f83) - READ_WORD(Memory.C4RAM + 0x1f89);
            int16 left, right;
            int j;
            for (j = 0; j < 225; j++)
            {
               if (y >= 0)
               {
                  left = SAR32((int32)tan1 * y, 16) -
                         READ_WORD(Memory.C4RAM + 0x1f80) +
                         READ_WORD(Memory.C4RAM + 0x1f86);
                  right = SAR32((int32)tan2 * y, 16) -
                          READ_WORD(Memory.C4RAM + 0x1f80) +
                          READ_WORD(Memory.C4RAM + 0x1f86) +
                          READ_WORD(Memory.C4RAM + 0x1f93);

                  if (left < 0 && right < 0)
                  {
                     left = 1;
                     right = 0;
                  }
                  else if (left < 0)
                     left = 0;
                  else if (right < 0)
                     right = 0;
                  if (left > 255 && right > 255)
                  {
                     left = 255;
                     right = 254;
                  }
                  else if (left > 255)
                     left = 255;
                  else if (right > 255)
                     right = 255;
               }
               else
               {
                  left = 1;
                  right = 0;
               }
               Memory.C4RAM[j + 0x800] = (uint8)left;
               Memory.C4RAM[j + 0x900] = (uint8)right;
               y++;
            }
         }
         break;

         case 0x25: // Multiply
         {
            int32 foo = READ_3WORD(Memory.C4RAM + 0x1f80);
            int32 bar = READ_3WORD(Memory.C4RAM + 0x1f83);
            foo *= bar;
            WRITE_3WORD(Memory.C4RAM + 0x1f80, foo);
         }
         break;

         case 0x2d: // Transform Coords
            C4WFXVal = READ_WORD(Memory.C4RAM + 0x1f81);
            C4WFYVal = READ_WORD(Memory.C4RAM + 0x1f84);
            C4WFZVal = READ_WORD(Memory.C4RAM + 0x1f87);
            C4WFX2Val = Memory.C4RAM[0x1f89];
            C4WFY2Val = Memory.C4RAM[0x1f8a];
            C4WFDist = Memory.C4RAM[0x1f8b];
            C4WFScale = READ_WORD(Memory.C4RAM + 0x1f90);
            C4TransfWireFrame2();
            WRITE_WORD(Memory.C4RAM + 0x1f80, C4WFXVal);
            WRITE_WORD(Memory.C4RAM + 0x1f83, C4WFYVal);
            break;

         case 0x40: // Sum
         {
            uint16 sum = 0;
            int i;
            for (i = 0; i < 0x800; sum += Memory.C4RAM[i++]);
            WRITE_WORD(Memory.C4RAM + 0x1f80, sum);
         }
         break;

         case 0x54: // Square
         {
            int64 a = SAR64((int64)READ_3WORD(Memory.C4RAM + 0x1f80) << 40, 40);
            // printf("%08X%08X\n", (uint32)(a>>32), (uint32)(a&0xFFFFFFFF));
            a *= a;
            // printf("%08X%08X\n", (uint32)(a>>32), (uint32)(a&0xFFFFFFFF));
            WRITE_3WORD(Memory.C4RAM + 0x1f83, a);
            WRITE_3WORD(Memory.C4RAM + 0x1f86, (a >> 24));
         }
         break;

         case 0x5c: // Immediate Reg
            for (i = 0; i < 12 * 4; i++)
               Memory.C4RAM [i] = C4TestPattern [i];
            break;

         case 0x89: // Immediate ROM
            Memory.C4RAM [0x1f80] = 0x36;
            Memory.C4RAM [0x1f81] = 0x43;
            Memory.C4RAM [0x1f82] = 0x05;
            break;

         default:
            break;
         }
      }
   }
   else if (Address == 0x7f47)
   {
      memmove(Memory.C4RAM + (READ_WORD(Memory.C4RAM + 0x1f45) & 0x1fff),
              C4GetMemPointer(READ_3WORD(Memory.C4RAM + 0x1f40)),
              READ_WORD(Memory.C4RAM + 0x1f43));
   }
}

int16 C4SinTable[512] =
{
   0,    402,    804,   1206,   1607,   2009,   2410,   2811,
   3211,   3611,   4011,   4409,   4808,   5205,   5602,   5997,
   6392,   6786,   7179,   7571,   7961,   8351,   8739,   9126,
   9512,   9896,  10278,  10659,  11039,  11416,  11793,  12167,
   12539,  12910,  13278,  13645,  14010,  14372,  14732,  15090,
   15446,  15800,  16151,  16499,  16846,  17189,  17530,  17869,
   18204,  18537,  18868,  19195,  19519,  19841,  20159,  20475,
   20787,  21097,  21403,  21706,  22005,  22301,  22594,  22884,
   23170,  23453,  23732,  24007,  24279,  24547,  24812,  25073,
   25330,  25583,  25832,  26077,  26319,  26557,  26790,  27020,
   27245,  27466,  27684,  27897,  28106,  28310,  28511,  28707,
   28898,  29086,  29269,  29447,  29621,  29791,  29956,  30117,
   30273,  30425,  30572,  30714,  30852,  30985,  31114,  31237,
   31357,  31471,  31581,  31685,  31785,  31881,  31971,  32057,
   32138,  32214,  32285,  32351,  32413,  32469,  32521,  32568,
   32610,  32647,  32679,  32706,  32728,  32745,  32758,  32765,
   32767,  32765,  32758,  32745,  32728,  32706,  32679,  32647,
   32610,  32568,  32521,  32469,  32413,  32351,  32285,  32214,
   32138,  32057,  31971,  31881,  31785,  31685,  31581,  31471,
   31357,  31237,  31114,  30985,  30852,  30714,  30572,  30425,
   30273,  30117,  29956,  29791,  29621,  29447,  29269,  29086,
   28898,  28707,  28511,  28310,  28106,  27897,  27684,  27466,
   27245,  27020,  26790,  26557,  26319,  26077,  25832,  25583,
   25330,  25073,  24812,  24547,  24279,  24007,  23732,  23453,
   23170,  22884,  22594,  22301,  22005,  21706,  21403,  21097,
   20787,  20475,  20159,  19841,  19519,  19195,  18868,  18537,
   18204,  17869,  17530,  17189,  16846,  16499,  16151,  15800,
   15446,  15090,  14732,  14372,  14010,  13645,  13278,  12910,
   12539,  12167,  11793,  11416,  11039,  10659,  10278,   9896,
   9512,   9126,   8739,   8351,   7961,   7571,   7179,   6786,
   6392,   5997,   5602,   5205,   4808,   4409,   4011,   3611,
   3211,   2811,   2410,   2009,   1607,   1206,    804,    402,
   0,   -402,   -804,  -1206,  -1607,  -2009,  -2410,  -2811,
   -3211,  -3611,  -4011,  -4409,  -4808,  -5205,  -5602,  -5997,
   -6392,  -6786,  -7179,  -7571,  -7961,  -8351,  -8739,  -9126,
   -9512,  -9896, -10278, -10659, -11039, -11416, -11793, -12167,
   -12539, -12910, -13278, -13645, -14010, -14372, -14732, -15090,
   -15446, -15800, -16151, -16499, -16846, -17189, -17530, -17869,
   -18204, -18537, -18868, -19195, -19519, -19841, -20159, -20475,
   -20787, -21097, -21403, -21706, -22005, -22301, -22594, -22884,
   -23170, -23453, -23732, -24007, -24279, -24547, -24812, -25073,
   -25330, -25583, -25832, -26077, -26319, -26557, -26790, -27020,
   -27245, -27466, -27684, -27897, -28106, -28310, -28511, -28707,
   -28898, -29086, -29269, -29447, -29621, -29791, -29956, -30117,
   -30273, -30425, -30572, -30714, -30852, -30985, -31114, -31237,
   -31357, -31471, -31581, -31685, -31785, -31881, -31971, -32057,
   -32138, -32214, -32285, -32351, -32413, -32469, -32521, -32568,
   -32610, -32647, -32679, -32706, -32728, -32745, -32758, -32765,
   -32767, -32765, -32758, -32745, -32728, -32706, -32679, -32647,
   -32610, -32568, -32521, -32469, -32413, -32351, -32285, -32214,
   -32138, -32057, -31971, -31881, -31785, -31685, -31581, -31471,
   -31357, -31237, -31114, -30985, -30852, -30714, -30572, -30425,
   -30273, -30117, -29956, -29791, -29621, -29447, -29269, -29086,
   -28898, -28707, -28511, -28310, -28106, -27897, -27684, -27466,
   -27245, -27020, -26790, -26557, -26319, -26077, -25832, -25583,
   -25330, -25073, -24812, -24547, -24279, -24007, -23732, -23453,
   -23170, -22884, -22594, -22301, -22005, -21706, -21403, -21097,
   -20787, -20475, -20159, -19841, -19519, -19195, -18868, -18537,
   -18204, -17869, -17530, -17189, -16846, -16499, -16151, -15800,
   -15446, -15090, -14732, -14372, -14010, -13645, -13278, -12910,
   -12539, -12167, -11793, -11416, -11039, -10659, -10278,  -9896,
   -9512,  -9126,  -8739,  -8351,  -7961,  -7571,  -7179,  -6786,
   -6392,  -5997,  -5602,  -5205,  -4808,  -4409,  -4011,  -3611,
   -3211,  -2811,  -2410,  -2009,  -1607,  -1206,   -804,   -402
};

int16 C4CosTable[512] =
{
   32767,  32765,  32758,  32745,  32728,  32706,  32679,  32647,
   32610,  32568,  32521,  32469,  32413,  32351,  32285,  32214,
   32138,  32057,  31971,  31881,  31785,  31685,  31581,  31471,
   31357,  31237,  31114,  30985,  30852,  30714,  30572,  30425,
   30273,  30117,  29956,  29791,  29621,  29447,  29269,  29086,
   28898,  28707,  28511,  28310,  28106,  27897,  27684,  27466,
   27245,  27020,  26790,  26557,  26319,  26077,  25832,  25583,
   25330,  25073,  24812,  24547,  24279,  24007,  23732,  23453,
   23170,  22884,  22594,  22301,  22005,  21706,  21403,  21097,
   20787,  20475,  20159,  19841,  19519,  19195,  18868,  18537,
   18204,  17869,  17530,  17189,  16846,  16499,  16151,  15800,
   15446,  15090,  14732,  14372,  14010,  13645,  13278,  12910,
   12539,  12167,  11793,  11416,  11039,  10659,  10278,   9896,
   9512,   9126,   8739,   8351,   7961,   7571,   7179,   6786,
   6392,   5997,   5602,   5205,   4808,   4409,   4011,   3611,
   3211,   2811,   2410,   2009,   1607,   1206,    804,    402,
   0,   -402,   -804,  -1206,  -1607,  -2009,  -2410,  -2811,
   -3211,  -3611,  -4011,  -4409,  -4808,  -5205,  -5602,  -5997,
   -6392,  -6786,  -7179,  -7571,  -7961,  -8351,  -8739,  -9126,
   -9512,  -9896, -10278, -10659, -11039, -11416, -11793, -12167,
   -12539, -12910, -13278, -13645, -14010, -14372, -14732, -15090,
   -15446, -15800, -16151, -16499, -16846, -17189, -17530, -17869,
   -18204, -18537, -18868, -19195, -19519, -19841, -20159, -20475,
   -20787, -21097, -21403, -21706, -22005, -22301, -22594, -22884,
   -23170, -23453, -23732, -24007, -24279, -24547, -24812, -25073,
   -25330, -25583, -25832, -26077, -26319, -26557, -26790, -27020,
   -27245, -27466, -27684, -27897, -28106, -28310, -28511, -28707,
   -28898, -29086, -29269, -29447, -29621, -29791, -29956, -30117,
   -30273, -30425, -30572, -30714, -30852, -30985, -31114, -31237,
   -31357, -31471, -31581, -31685, -31785, -31881, -31971, -32057,
   -32138, -32214, -32285, -32351, -32413, -32469, -32521, -32568,
   -32610, -32647, -32679, -32706, -32728, -32745, -32758, -32765,
   -32767, -32765, -32758, -32745, -32728, -32706, -32679, -32647,
   -32610, -32568, -32521, -32469, -32413, -32351, -32285, -32214,
   -32138, -32057, -31971, -31881, -31785, -31685, -31581, -31471,
   -31357, -31237, -31114, -30985, -30852, -30714, -30572, -30425,
   -30273, -30117, -29956, -29791, -29621, -29447, -29269, -29086,
   -28898, -28707, -28511, -28310, -28106, -27897, -27684, -27466,
   -27245, -27020, -26790, -26557, -26319, -26077, -25832, -25583,
   -25330, -25073, -24812, -24547, -24279, -24007, -23732, -23453,
   -23170, -22884, -22594, -22301, -22005, -21706, -21403, -21097,
   -20787, -20475, -20159, -19841, -19519, -19195, -18868, -18537,
   -18204, -17869, -17530, -17189, -16846, -16499, -16151, -15800,
   -15446, -15090, -14732, -14372, -14010, -13645, -13278, -12910,
   -12539, -12167, -11793, -11416, -11039, -10659, -10278,  -9896,
   -9512,  -9126,  -8739,  -8351,  -7961,  -7571,  -7179,  -6786,
   -6392,  -5997,  -5602,  -5205,  -4808,  -4409,  -4011,  -3611,
   -3211,  -2811,  -2410,  -2009,  -1607,  -1206,   -804,   -402,
   0,    402,    804,   1206,   1607,   2009,   2410,   2811,
   3211,   3611,   4011,   4409,   4808,   5205,   5602,   5997,
   6392,   6786,   7179,   7571,   7961,   8351,   8739,   9126,
   9512,   9896,  10278,  10659,  11039,  11416,  11793,  12167,
   12539,  12910,  13278,  13645,  14010,  14372,  14732,  15090,
   15446,  15800,  16151,  16499,  16846,  17189,  17530,  17869,
   18204,  18537,  18868,  19195,  19519,  19841,  20159,  20475,
   20787,  21097,  21403,  21706,  22005,  22301,  22594,  22884,
   23170,  23453,  23732,  24007,  24279,  24547,  24812,  25073,
   25330,  25583,  25832,  26077,  26319,  26557,  26790,  27020,
   27245,  27466,  27684,  27897,  28106,  28310,  28511,  28707,
   28898,  29086,  29269,  29447,  29621,  29791,  29956,  30117,
   30273,  30425,  30572,  30714,  30852,  30985,  31114,  31237,
   31357,  31471,  31581,  31685,  31785,  31881,  31971,  32057,
   32138,  32214,  32285,  32351,  32413,  32469,  32521,  32568,
   32610,  32647,  32679,  32706,  32728,  32745,  32758,  32765
};