(*

 * Hedgewars, a Worms style game

 * Copyright (c) 2007 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *)

unit uFloat;

interface

{$IFDEF FPC}

{$ifdef FPC_LITTLE_ENDIAN}

type hwFloat = record

               isNegative: boolean;

               case byte of

               0: (Frac, Round: Longword);

               1: (QWordValue : QWord);

               end;

{$else FPC_LITTLE_ENDIAN}

type hwFloat = record

               isNegative: boolean;

               case byte of

               0: (Round, Frac: Longword);

               1: (QWordValue : QWord);

               end;

{$endif FPC_LITTLE_ENDIAN}

operator := (i: LongInt) z : hwFloat;

operator + (z1, z2: hwFloat) z : hwFloat;

operator - (z1, z2: hwFloat) z : hwFloat;

operator - (z1: hwFloat) z : hwFloat;

operator * (z1, z2: hwFloat) z : hwFloat;

operator * (z1: hwFloat; z2: LongInt) z : hwFloat;

operator / (z1, z2: hwFloat) z : hwFloat;

operator < (z1, z2: hwFloat) b : boolean;

operator > (z1, z2: hwFloat) b : boolean;

function cstr(z: hwFloat): string;

function hwRound(t: hwFloat): integer;

function hwAbs(t: hwFloat): hwFloat;

function hwSqr(t: hwFloat): hwFloat;

function hwSqrt(t: hwFloat): hwFloat;

function Distance(dx, dy: hwFloat): hwFloat;

function AngleSin(Angle: Longword): hwFloat;

function AngleCos(Angle: Longword): hwFloat;

const  _1div1024: hwFloat = (isNegative: false; QWordValue:     4194304);

      _1div10000: hwFloat = (isNegative: false; QWordValue:      429496);

      _1div50000: hwFloat = (isNegative: false; QWordValue:       85899);

     _1div100000: hwFloat = (isNegative: false; QWordValue:       42950);

          _1div3: hwFloat = (isNegative: false; QWordValue:  1431655766);

            hwPi: hwFloat = (isNegative: false; QWordValue: 13493037704);

       _0_000004: hwFloat = (isNegative: false; QWordValue:       17179);

         _0_0002: hwFloat = (isNegative: false; QWordValue:      858993);

          _0_001: hwFloat = (isNegative: false; QWordValue:     4294967);

          _0_003: hwFloat = (isNegative: false; QWordValue:    12884902);

          _0_004: hwFloat = (isNegative: false; QWordValue:    17179869);

          _0_005: hwFloat = (isNegative: false; QWordValue:    21474836);

           _0_01: hwFloat = (isNegative: false; QWordValue:    42949673);

           _0_02: hwFloat = (isNegative: false; QWordValue:    85899345);

           _0_03: hwFloat = (isNegative: false; QWordValue:   128849018);

           _0_08: hwFloat = (isNegative: false; QWordValue:   343597383);

            _0_1: hwFloat = (isNegative: false; QWordValue:   429496729);

           _0_15: hwFloat = (isNegative: false; QWordValue:   644245094);

            _0_2: hwFloat = (isNegative: false; QWordValue:   858993459);

           _0_25: hwFloat = (isNegative: false; QWordValue:  1073741824);

            _0_3: hwFloat = (isNegative: false; QWordValue:  1288490189);

           _0_35: hwFloat = (isNegative: false; QWordValue:  1503238553);

            _0_4: hwFloat = (isNegative: false; QWordValue:  1717986918);

           _0_45: hwFloat = (isNegative: false; QWordValue:  1932735283);

            _0_5: hwFloat = (isNegative: false; QWordValue:  2147483648);

           _0_55: hwFloat = (isNegative: false; QWordValue:  2362232012);

            _0_6: hwFloat = (isNegative: false; QWordValue:  2576980377);

            _0_8: hwFloat = (isNegative: false; QWordValue:  3435973837);

           _0_84: hwFloat = (isNegative: false; QWordValue:  3607772528);

           _0_87: hwFloat = (isNegative: false; QWordValue:  3736621547);

            _0_9: hwFloat = (isNegative: false; QWordValue:  3865470566);

           _0_93: hwFloat = (isNegative: false; QWordValue:  3994319585);

           _0_96: hwFloat = (isNegative: false; QWordValue:  4123168604);

          _0_995: hwFloat = (isNegative: false; QWordValue:  4273492459);

          _0_999: hwFloat = (isNegative: false; QWordValue:  4290672328);

            _1_9: hwFloat = (isNegative: false; QWordValue:  8160437862);

         cLittle: hwFloat = (isNegative: false; QWordValue:           1);

         cHHKick: hwFloat = (isNegative: false; QWordValue:   128849018);

{$ENDIF}

{$IFNDEF FPC}

type hwFloat = Extended;

{$ENDIF}

implementation

uses uConsts;

{$IFDEF FPC}

operator := (i: LongInt) z : hwFloat;

begin

z.isNegative:= i < 0;

z.Round:= abs(i);

z.Frac:= 0

end;

operator + (z1, z2: hwFloat) z : hwFloat;

begin

if z1.isNegative = z2.isNegative then

   begin

   z.isNegative:= z1.isNegative;

   z.QWordValue:= z1.QWordValue + z2.QWordValue

   end

else

   if z1.QWordValue > z2.QWordValue then

      begin

      z.isNegative:= z1.isNegative;

      z.QWordValue:= z1.QWordValue - z2.QWordValue

      end else

      begin

      z.isNegative:= z2.isNegative;

      z.QWordValue:= z2.QWordValue - z1.QWordValue

      end

end;

operator - (z1, z2: hwFloat) z : hwFloat;

begin

if z1.isNegative = z2.isNegative then

   if z1.QWordValue > z2.QWordValue then

      begin

      z.isNegative:= z1.isNegative;

      z.QWordValue:= z1.QWordValue - z2.QWordValue

      end else

      begin

      z.isNegative:= not z2.isNegative;

      z.QWordValue:= z2.QWordValue - z1.QWordValue

      end

else begin

     z.isNegative:= z1.isNegative;

     z.QWordValue:= z1.QWordValue + z2.QWordValue

     end

end;

operator - (z1: hwFloat) z : hwFloat;

begin

z:= z1;

z.isNegative:= not z.isNegative

end;

operator * (z1, z2: hwFloat) z : hwFloat;

begin

z.isNegative:= z1.isNegative xor z2.isNegative;

z.QWordValue:= QWord(z1.Round) * z2.Frac +

               QWord(z1.Frac) * z2.Round +

               ((QWord(z1.Frac) * z2.Frac) shr 32);

z.Round:= z.Round + QWord(z1.Round) * z2.Round;

end;

operator * (z1: hwFloat; z2: LongInt) z : hwFloat;

begin

z.isNegative:= z1.isNegative xor (z2 < 0);

z2:= abs(z2);

z.QWordValue:= z1.QWordValue * z2

end;

operator / (z1, z2: hwFloat) z : hwFloat;

var t: hwFloat;

begin

z.isNegative:= z1.isNegative xor z2.isNegative;

z.Round:= z1.QWordValue div z2.QWordValue;

t:= z1 - z2 * z.Round;

if t.QWordValue = 0 then

   z.Frac:= 0

else

   begin

   while ((t.QWordValue and $8000000000000000) = 0) and

         ((z2.QWordValue and $8000000000000000) = 0) do

         begin

         t.QWordValue:= t.QWordValue shl 1;

         z2.QWordValue:= z2.QWordValue shl 1

         end;

   z.Frac:= (t.QWordValue) div (z2.Round)

   end

end;

operator < (z1, z2: hwFloat) b : boolean;

begin

if z1.isNegative <> z2.isNegative then

   b:= z1.isNegative

else

   if z1.QWordValue = z2.QWordValue then

      b:= false

   else

      b:= (z1.QWordValue < z2.QWordValue) xor z1.isNegative

end;

operator > (z1, z2: hwFloat) b : boolean;

begin

if z1.isNegative <> z2.isNegative then

   b:= z2.isNegative

else

   if z1.QWordValue = z2.QWordValue then

      b:= false

   else

      b:= (z1.QWordValue > z2.QWordValue) xor z2.isNegative

end;

function cstr(z: hwFloat): string;

var tmpstr: string;

begin

str(z.Round, cstr);

if z.Frac <> 0 then

   begin

   str(z.Frac / $100000000:1:15, tmpstr);

   delete(tmpstr, 1, 2);

   cstr:= cstr + '.' + tmpstr

   end;

if z.isNegative then cstr:= '-' + cstr

end;

function hwRound(t: hwFloat): integer;

begin

if t.isNegative then hwRound:= -t.Round

                else hwRound:= t.Round

end;

function hwAbs(t: hwFloat): hwFloat;

begin

hwAbs:= t;

hwAbs.isNegative:= false

end;

function hwSqr(t: hwFloat): hwFloat;

begin

hwSqr:= t * t

end;

function hwSqrt(t: hwFloat): hwFloat;

begin

hwSqrt.isNegative:= false;

hwSqrt.QWordValue:= Round(sqrt(1.0 / $100000000 * (t.QWordValue)) * $100000000)

end;

function Distance(dx, dy: hwFloat): hwFloat;

var x, y: hwFloat;

    Result: hwFloat;

begin

x:= dx * dx;

y:= dy * dy;

Result:= x + y;

Result.QWordValue:= Round(sqrt(1.0 / $100000000 * (Result.QWordValue)) * $100000000);

Distance:= Result

end;

{$INCLUDE SinTable.inc}

function AngleSin(Angle: Longword): hwFloat;

begin

AngleSin.isNegative:= false;

if Angle < 1024 then AngleSin.QWordValue:= SinTable[Angle]

                else AngleSin.QWordValue:= SinTable[2048 - Angle]

end;

function AngleCos(Angle: Longword): hwFloat;

var CosVal: Extended;

begin

AngleCos.isNegative:= Angle > 1024;

if Angle < 1024 then AngleCos.QWordValue:= SinTable[1024 - Angle]

                else AngleCos.QWordValue:= SinTable[Angle - 1024]

end;

{$ENDIF}

end.