(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2005-2008 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 uLand;

interface

uses SDLh, uLandTemplates, uFloat, 

{$IFDEF GLES11}

	gles11,

{$ELSE}

	GL,

{$ENDIF}

	uConsts;

{$include options.inc}

type TLandArray = packed array[0 .. LAND_HEIGHT - 1, 0 .. LAND_WIDTH - 1] of LongWord;

TCollisionArray = packed array[0 .. LAND_HEIGHT - 1, 0 .. LAND_WIDTH - 1] of Word;

	TPreview  = packed array[0..127, 0..31] of byte;

	TDirtyTag = packed array[0 .. LAND_HEIGHT div 32 - 1, 0 .. LAND_WIDTH div 32 - 1] of byte;

var  Land: TCollisionArray;

     LandPixels: TLandArray;

     LandDirty: TDirtyTag;

     hasBorder: boolean; // I'm putting this here for now.  I'd like it to be toggleable by user (so user can set a border on a non-cave map) - will turn off air attacks

     hasGirders: boolean;  // I think should be on template by template basis. some caverns might have open water and large spaces.  Some islands do not need? It might be better to tweak the girder code based upon space above.  dunno.

     playHeight, playWidth, leftX, rightX, topY, MaxHedgehogs: Longword;  // idea is that a template can specify height/width.  Or, a map, a height/width by the dimensions of the image.  If the map has pixels near top of image, it triggers border.  Maybe not a good idea, but, for now?  Could also be used to prevent placing a girder outside play area on maps with hasBorder = true

// in your coding style, it appears to be "isXXXX" for a verb, and "FooBar" for everything else - should be PlayHeight ?

procedure GenMap;

function  GenPreview: TPreview;

procedure CheckLandDigest(s: shortstring);

implementation

uses uConsole, uStore, uMisc, uRandom, uTeams, uLandObjects, uSHA, uIO, uAmmos, uLandTexture;

type TPixAr = record

              Count: Longword;

              ar: array[0..Pred(cMaxEdgePoints)] of TPoint;

              end;

procedure LogLandDigest;

var ctx: TSHA1Context;

    dig: TSHA1Digest;

    s: shortstring;

begin

SHA1Init(ctx);

SHA1UpdateLongwords(ctx, @Land, sizeof(Land) div 4);

dig:= SHA1Final(ctx);

s:='M{'+inttostr(dig[0])+':'

       +inttostr(dig[1])+':'

       +inttostr(dig[2])+':'

       +inttostr(dig[3])+':'

       +inttostr(dig[4])+'}';

CheckLandDigest(s);

SendIPCRaw(@s[0], Length(s) + 1)

end;

procedure CheckLandDigest(s: shortstring);

const digest: shortstring = '';

begin

{$IFDEF DEBUGFILE}

AddFileLog('CheckLandDigest: ' + s);

{$ENDIF}

if digest = '' then

   digest:= s

else

   TryDo(s = digest, 'Different maps generated, sorry', true)

end;

procedure DrawLine(X1, Y1, X2, Y2: LongInt; Color: Longword);

var

  eX, eY, dX, dY: LongInt;

  i, sX, sY, x, y, d: LongInt;

begin

eX:= 0;

eY:= 0;

dX:= X2 - X1;

dY:= Y2 - Y1;

if (dX > 0) then sX:= 1

else

  if (dX < 0) then

     begin

     sX:= -1;

     dX:= -dX

     end else sX:= dX;

if (dY > 0) then sY:= 1

  else

  if (dY < 0) then

     begin

     sY:= -1;

     dY:= -dY

     end else sY:= dY;

if (dX > dY) then d:= dX

             else d:= dY;

x:= X1;

y:= Y1;

for i:= 0 to d do

    begin

    inc(eX, dX);

    inc(eY, dY);

    if (eX > d) then

       begin

       dec(eX, d);

       inc(x, sX);

       end;

    if (eY > d) then

       begin

       dec(eY, d);

       inc(y, sY);

       end;

    if ((x and LAND_WIDTH_MASK) = 0) and ((y and LAND_HEIGHT_MASK) = 0) then

       Land[y, x]:= Color;

    end

end;

procedure DrawEdge(var pa: TPixAr; Color: Longword);

var i: LongInt;

begin

i:= 0;

with pa do

while i < LongInt(Count) - 1 do

    if (ar[i + 1].X = NTPX) then inc(i, 2)

       else begin

       DrawLine(ar[i].x, ar[i].y, ar[i + 1].x, ar[i + 1].y, Color);

       inc(i)

       end

end;

procedure Vector(p1, p2, p3: TPoint; var Vx, Vy: hwFloat);

var d1, d2, d: hwFloat;

begin

Vx:= int2hwFloat(p1.X - p3.X);

Vy:= int2hwFloat(p1.Y - p3.Y);

d:= DistanceI(p2.X - p1.X, p2.Y - p1.Y);

d1:= DistanceI(p2.X - p3.X, p2.Y - p3.Y);

d2:= Distance(Vx, Vy);

if d1 < d then d:= d1;

if d2 < d then d:= d2;

d:= d * _1div3;

if d2.QWordValue = 0 then

   begin

   Vx:= _0;

   Vy:= _0

   end else

   begin

   d2:= _1 / d2;

   Vx:= Vx * d2;

   Vy:= Vy * d2;

   Vx:= Vx * d;

   Vy:= Vy * d

   end

end;

procedure AddLoopPoints(var pa, opa: TPixAr; StartI, EndI: LongInt; Delta: hwFloat);

var i, pi, ni: LongInt;

    NVx, NVy, PVx, PVy: hwFloat;

    x1, x2, y1, y2: LongInt;

    tsq, tcb, t, r1, r2, r3, cx1, cx2, cy1, cy2: hwFloat;

    X, Y: LongInt;

begin

pi:= EndI;

i:= StartI;

ni:= Succ(StartI);

Vector(opa.ar[pi], opa.ar[i], opa.ar[ni], NVx, NVy);

repeat

    inc(pi);

    if pi > EndI then pi:= StartI;

    inc(i);

    if i > EndI then i:= StartI;

    inc(ni);

    if ni > EndI then ni:= StartI;

    PVx:= NVx;

    PVy:= NVy;

    Vector(opa.ar[pi], opa.ar[i], opa.ar[ni], NVx, NVy);

    x1:= opa.ar[pi].x;

    y1:= opa.ar[pi].y;

    x2:= opa.ar[i].x;

    y2:= opa.ar[i].y;

    cx1:= int2hwFloat(x1) - PVx;

    cy1:= int2hwFloat(y1) - PVy;

    cx2:= int2hwFloat(x2) + NVx;

    cy2:= int2hwFloat(y2) + NVy;

    t:= _0;

    while t.Round = 0 do

          begin

          tsq:= t * t;

          tcb:= tsq * t;

          r1:= (_1 - t*3 + tsq*3 - tcb);

          r2:= (     t*3 - tsq*6 + tcb*3);

          r3:= (           tsq*3 - tcb*3);

          X:= hwRound(r1 * x1 + r2 * cx1 + r3 * cx2 + tcb * x2);

          Y:= hwRound(r1 * y1 + r2 * cy1 + r3 * cy2 + tcb * y2);

          t:= t + Delta;

          pa.ar[pa.Count].x:= X;

          pa.ar[pa.Count].y:= Y;

          inc(pa.Count);

          TryDo(pa.Count <= cMaxEdgePoints, 'Edge points overflow', true)

          end;

until i = StartI;

pa.ar[pa.Count].x:= opa.ar[StartI].X;

pa.ar[pa.Count].y:= opa.ar[StartI].Y;

inc(pa.Count)

end;

procedure BezierizeEdge(var pa: TPixAr; Delta: hwFloat);

var i, StartLoop: LongInt;

    opa: TPixAr;

begin

opa:= pa;

pa.Count:= 0;

i:= 0;

StartLoop:= 0;

while i < LongInt(opa.Count) do

    if (opa.ar[i + 1].X = NTPX) then

       begin

       AddLoopPoints(pa, opa, StartLoop, i, Delta);

       inc(i, 2);

       StartLoop:= i;

       pa.ar[pa.Count].X:= NTPX;

       inc(pa.Count);

       end else inc(i)

end;

procedure FillLand(x, y: LongInt);

var Stack: record

           Count: Longword;

           points: array[0..8192] of record

                                     xl, xr, y, dir: LongInt;

                                     end

           end;

    procedure Push(_xl, _xr, _y, _dir: LongInt);

    begin

    TryDo(Stack.Count <= 8192, 'FillLand: stack overflow', true);

    _y:= _y + _dir;

    if (_y < 0) or (_y >= LAND_HEIGHT) then exit;

    with Stack.points[Stack.Count] do

         begin

         xl:= _xl;

         xr:= _xr;

         y:= _y;

         dir:= _dir

         end;

    inc(Stack.Count)

    end;

    procedure Pop(var _xl, _xr, _y, _dir: LongInt);

    begin

    dec(Stack.Count);

    with Stack.points[Stack.Count] do

         begin

         _xl:= xl;

         _xr:= xr;

         _y:= y;

         _dir:= dir

         end

    end;

var xl, xr, dir: LongInt;

begin

Stack.Count:= 0;

xl:= x - 1;

xr:= x;

Push(xl, xr, y, -1);

Push(xl, xr, y,  1);

while Stack.Count > 0 do

      begin

      Pop(xl, xr, y, dir);

      while (xl > 0) and (Land[y, xl] <> 0) do dec(xl);

      while (xr < LAND_WIDTH - 1) and (Land[y, xr] <> 0) do inc(xr);

      while (xl < xr) do

            begin

            while (xl <= xr) and (Land[y, xl] = 0) do inc(xl);

            x:= xl;

            while (xl <= xr) and (Land[y, xl] <> 0) do

                  begin

                  Land[y, xl]:= 0;

                  inc(xl)

                  end;

            if x < xl then

               begin

               Push(x, Pred(xl), y, dir);

               Push(x, Pred(xl), y,-dir);

               end;

            end;

      end;

end;

procedure ColorizeLand(Surface: PSDL_Surface);

var tmpsurf: PSDL_Surface;

    r, rr: TSDL_Rect;

    x, yd, yu: LongInt;

begin

tmpsurf:= LoadImage(Pathz[ptCurrTheme] + '/LandTex', ifCritical or ifIgnoreCaps);

r.y:= 0;

while r.y < LAND_HEIGHT do

	begin

	r.x:= 0;

	while r.x < LAND_WIDTH do

		begin

		SDL_UpperBlit(tmpsurf, nil, Surface, @r);

		inc(r.x, tmpsurf^.w)

		end;

	inc(r.y, tmpsurf^.h)

	end;

SDL_FreeSurface(tmpsurf);

tmpsurf:= LoadImage(Pathz[ptCurrTheme] + '/Border', ifCritical or ifIgnoreCaps or ifTransparent);

for x:= 0 to LAND_WIDTH - 1 do

	begin

	yd:= LAND_HEIGHT - 1;

	repeat

		while (yd > 0) and (Land[yd, x] =  0) do dec(yd);

		if (yd < 0) then yd:= 0;

		while (yd < LAND_HEIGHT) and (Land[yd, x] <> 0) do inc(yd);

		dec(yd);

		yu:= yd;

		while (yu > 0  ) and (Land[yu, x] <> 0) do dec(yu);

		while (yu < yd ) and (Land[yu, x] =  0) do inc(yu);

		if (yd < LAND_HEIGHT - 1) and ((yd - yu) >= 16) then

			begin

			rr.x:= x;

			rr.y:= yd - 15;

			r.x:= x mod tmpsurf^.w;

			r.y:= 16;

			r.w:= 1;

			r.h:= 16;

			SDL_UpperBlit(tmpsurf, @r, Surface, @rr);

			end;

		if (yu > 0) then

			begin

			rr.x:= x;

			rr.y:= yu;

			r.x:= x mod tmpsurf^.w;

			r.y:= 0;

			r.w:= 1;

			r.h:= min(16, yd - yu + 1);

			SDL_UpperBlit(tmpsurf, @r, Surface, @rr);

			end;

		yd:= yu - 1;

	until yd < 0;

	end;

end;

procedure SetPoints(var Template: TEdgeTemplate; var pa: TPixAr);

var i: LongInt;

begin

with Template do

     begin

     pa.Count:= BasePointsCount;

     for i:= 0 to pred(pa.Count) do

         begin

         pa.ar[i].x:= BasePoints^[i].x + LongInt(GetRandom(BasePoints^[i].w));

         if pa.ar[i].x <> NTPX then

            pa.ar[i].x:= pa.ar[i].x + ((LAND_WIDTH - Template.TemplateWidth) div 2);

         pa.ar[i].y:= BasePoints^[i].y + LongInt(GetRandom(BasePoints^[i].h)) + LAND_HEIGHT - Template.TemplateHeight

         end;

     if canMirror then

        if getrandom(2) = 0 then

           begin

           for i:= 0 to pred(BasePointsCount) do

             if pa.ar[i].x <> NTPX then

               pa.ar[i].x:= LAND_WIDTH - 1 - pa.ar[i].x;

           for i:= 0 to pred(FillPointsCount) do

               FillPoints^[i].x:= LAND_WIDTH - 1 - FillPoints^[i].x;

           end;

           begin

           for i:= 0 to pred(BasePointsCount) do

               pa.ar[i].y:= LAND_HEIGHT - 1 - pa.ar[i].y;

           for i:= 0 to pred(FillPointsCount) do

               FillPoints^[i].y:= LAND_HEIGHT - 1 - FillPoints^[i].y;

           end;

     end

end;

function CheckIntersect(V1, V2, V3, V4: TPoint): boolean;

var c1, c2, dm: LongInt;

begin

dm:= (V4.y - V3.y) * (V2.x - V1.x) - (V4.x - V3.x) * (V2.y - V1.y);

c1:= (V4.x - V3.x) * (V1.y - V3.y) - (V4.y - V3.y) * (V1.x - V3.x);

if dm = 0 then exit(false);

c2:= (V2.x - V3.x) * (V1.y - V3.y) - (V2.y - V3.y) * (V1.x - V3.x);

if dm > 0 then

   begin

   if (c1 < 0) or (c1 > dm) then exit(false);

   if (c2 < 0) or (c2 > dm) then exit(false)

   end else

   begin

   if (c1 > 0) or (c1 < dm) then exit(false);

   if (c2 > 0) or (c2 < dm) then exit(false)

   end;

//AddFileLog('1  (' + inttostr(V1.x) + ',' + inttostr(V1.y) + ')x(' + inttostr(V2.x) + ',' + inttostr(V2.y) + ')');

//AddFileLog('2  (' + inttostr(V3.x) + ',' + inttostr(V3.y) + ')x(' + inttostr(V4.x) + ',' + inttostr(V4.y) + ')');

CheckIntersect:= true

end;

function CheckSelfIntersect(var pa: TPixAr; ind: Longword): boolean;

var i: Longword;

begin

if (ind <= 0) or (ind >= Pred(pa.Count)) then exit(false);

for i:= 1 to pa.Count - 3 do

    if (i <= ind - 1) or (i >= ind + 2) then

      begin

      if (i <> ind - 1) and

         CheckIntersect(pa.ar[ind], pa.ar[ind - 1], pa.ar[i], pa.ar[i - 1]) then exit(true);

      if (i <> ind + 2) and

         CheckIntersect(pa.ar[ind], pa.ar[ind + 1], pa.ar[i], pa.ar[i - 1]) then exit(true);

      end;

CheckSelfIntersect:= false

end;

procedure RandomizePoints(var pa: TPixAr);

const cEdge = 55;

      cMinDist = 8;

var radz: array[0..Pred(cMaxEdgePoints)] of LongInt;

    i, k, dist, px, py: LongInt;

begin

radz[0]:= 0;