(*

 * Hedgewars, a worms-like game

 * Copyright (c) 2005, 2006 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;

{$include options.inc}

type TLandArray = packed array[0..1023, 0..2047] of LongWord;

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

var  Land: TLandArray;

     LandSurface: PSDL_Surface;

     Preview: TPreview;

procedure GenMap;

procedure GenPreview;

implementation

uses uConsole, uStore, uMisc, uConsts, uRandom, uTeams, uLandObjects, uSHA, uIO;

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);

SHA1Update(ctx, @Land, sizeof(Land));

dig:= SHA1Final(ctx);

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

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

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

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

end;

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

var

  eX, eY, dX, dY: integer;

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

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 $FFFFF800) = 0) and ((y and $FFFFFC00) = 0) then

       Land[y, x]:= Color;

    end

end;

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

var i: integer;

begin

i:= 0;

with pa do

while i < integer(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:= p1.X - p3.X;

Vy:= p1.Y - p3.Y;

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

d1:= Distance(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: integer; Delta: hwFloat);

var i, pi, ni: integer;

    NVx, NVy, PVx, PVy: hwFloat;

    x1, x2, y1, y2, cx1, cx2, cy1, cy2: hwFloat;

    tsq, tcb, t, r1, r2, r3, r4: hwFloat;

    X, Y: integer;

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:= x1 - PVx;

    cy1:= y1 - PVy;

    cx2:= x2 + NVx;

    cy2:= y2 + NVy;

    t:= 0;

    while t.Round = 0 do

          begin

          tsq:= t * t;

          tcb:= tsq * t;

          r1:= (1 - 3*t + 3*tsq -   tcb) * x1;

          r2:= (    3*t - 6*tsq + 3*tcb) * cx1;

          r3:= (          3*tsq - 3*tcb) * cx2;

          r4:= (                    tcb) * x2;

          X:= hwRound(r1 + r2 + r3 + r4);

          r1:= (1 - 3*t + 3*tsq -   tcb) * y1;

          r2:= (    3*t - 6*tsq + 3*tcb) * cy1;

          r3:= (          3*tsq - 3*tcb) * cy2;

          r4:= (                    tcb) * y2;

          Y:= hwRound(r1 + r2 + r3 + r4);

          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 x, y, i, StartLoop: integer;

    opa: TPixAr;

begin

opa:= pa;

pa.Count:= 0;

i:= 0;

StartLoop:= 0;

while i < integer(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: integer);

var Stack: record

           Count: Longword;

           points: array[0..8192] of record

                                     xl, xr, y, dir: integer;

                                     end

           end;

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

    begin

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

    _y:= _y + _dir;

    if (_y < 0) or (_y > 1023) 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: integer);

    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: integer;

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 < 2047) 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: TSDL_Rect;

begin

tmpsurf:= LoadImage(Pathz[ptCurrTheme] + '/LandTex', false, true, true);

r.y:= 0;

while r.y < 1024 do

      begin

      r.x:= 0;

      while r.x < 2048 do

            begin

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

            inc(r.x, tmpsurf^.w)

            end;

      inc(r.y, tmpsurf^.h)

      end;

SDL_FreeSurface(tmpsurf);

tmpsurf:= SDL_CreateRGBSurfaceFrom(@Land, 2048, 1024, 32, 2048*4, $FF0000, $FF00, $FF, 0);

SDLTry(tmpsurf <> nil, true);

SDL_SetColorKey(tmpsurf, SDL_SRCCOLORKEY, SDL_MapRGB(tmpsurf^.format, $FF, $FF, $FF));

SDL_UpperBlit(tmpsurf, nil, Surface, nil);

SDL_FreeSurface(tmpsurf)

end;

procedure AddBorder(Surface: PSDL_Surface);

var tmpsurf: PSDL_Surface;

    r, rr: TSDL_Rect;

    x, yd, yu: integer;

begin

tmpsurf:= LoadImage(Pathz[ptCurrTheme] + '/Border', false, true, true);

for x:= 0 to 2047 do

    begin

    yd:= 1023;

    repeat

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

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

      while (yd < 1024) 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 < 1023) 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: integer;

begin

with Template do

     begin

     pa.Count:= BasePointsCount;

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

         begin

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

         pa.ar[i].y:= BasePoints^[i].y + integer(GetRandom(BasePoints^[i].h))

         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:= 2047 - pa.ar[i].x;

           for i:= 0 to pred(FillPointsCount) do

               FillPoints^[i].x:= 2047 - FillPoints^[i].x;

           end;

     if canFlip then

        if getrandom(2) = 0 then

           begin

           for i:= 0 to pred(BasePointsCount) do

               pa.ar[i].y:= 1023 - pa.ar[i].y;

           for i:= 0 to pred(FillPointsCount) do

               FillPoints^[i].y:= 1023 - FillPoints^[i].y;

           end;

     end

end;

procedure RandomizePoints(var pa: TPixAr; MaxRad: integer);

const cEdge = 55;

      cMinDist = 0;

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

    i, k, dist: integer;

begin

radz[0]:= 0;

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

  with pa.ar[i] do

    if x <> NTPX then

      begin

      radz[i]:= Min(Max(x - cEdge, 0), Max(2048 - cEdge - x, 0));

      radz[i]:= Min(radz[i], Min(Max(y - cEdge, 0), Max(1024 - cEdge - y, 0)));

      if radz[i] > 0 then

        for k:= 0 to Pred(i) do

          begin

          dist:= Min(Max(abs(x - pa.ar[k].x), abs(y - pa.ar[k].y)), MaxRad);

          radz[k]:= Max(0, Min((dist - cMinDist) div 2, radz[k]));

          radz[i]:= Max(0, Min(dist - radz[k] - cMinDist, radz[i]))

        end

      end;

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

  with pa.ar[i] do

    if ((x and $FFFFF800) = 0) and ((y and $FFFFFC00) = 0) then

      begin

      x:= x + integer(GetRandom(7) - 3) * (radz[i] * 5 div 7) div 3;

      y:= y + integer(GetRandom(7) - 3) * (radz[i] * 5 div 7) div 3

      end

end;

procedure GenBlank(var Template: TEdgeTemplate);

var pa: TPixAr;

    i: Longword;

    y, x: Longword;

begin

for y:= 0 to 1023 do

    for x:= 0 to 2047 do

        Land[y, x]:= COLOR_LAND;

SetPoints(Template, pa);

BezierizeEdge(pa, _1div3);

for i:= 0 to Pred(Template.RandPassesCount) do RandomizePoints(pa, 1000);

BezierizeEdge(pa, _1div3);

RandomizePoints(pa, 1000);

BezierizeEdge(pa, _0_1);

DrawEdge(pa, 0);

with Template do

     for i:= 0 to pred(FillPointsCount) do

         with FillPoints^[i] do

              FillLand(x, y);

DrawEdge(pa, COLOR_LAND)

end;

function SelectTemplate: integer;

begin

SelectTemplate:= getrandom(Succ(High(EdgeTemplates)))

end;

procedure GenLandSurface;

var tmpsurf: PSDL_Surface;

begin

WriteLnToConsole('Generating land...');

GenBlank(EdgeTemplates[SelectTemplate]);

AddProgress;

with PixelFormat^ do

     tmpsurf:= SDL_CreateRGBSurface(SDL_HWSURFACE, 2048, 1024, BitsPerPixel, RMask, GMask, BMask, AMask);

TryDo(tmpsurf <> nil, 'Error creating pre-land surface', true);

ColorizeLand(tmpsurf);

AddProgress;

AddBorder(tmpsurf);

with PixelFormat^ do

     LandSurface:= SDL_CreateRGBSurface(SDL_HWSURFACE, 2048, 1024, BitsPerPixel, RMask, GMask, BMask, AMask);

TryDo(LandSurface <> nil, 'Error creating land surface', true);

SDL_FillRect(LandSurface, nil, 0);

AddProgress;

SDL_SetColorKey(tmpsurf, SDL_SRCCOLORKEY, 0);

AddObjects(tmpsurf, LandSurface);

SDL_FreeSurface(tmpsurf);