(*

 * Hedgewars, a worms-like game

 * Copyright (c) 2005 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * Distributed under the terms of the BSD-modified licence:

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * with the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO

 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *)

unit uLand;

interface

uses SDLh;

{$include options.inc}

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

var  Land: TLandArray;

     LandSurface: PSDL_Surface;

procedure GenLandSurface;

procedure MakeFortsMap;

procedure AddHHPoint(_x, _y: integer);

procedure GetHHPoint(out _x, _y: integer);

procedure RandomizeHHPoints;

implementation

type TPixAr = record

              Count: Longword;

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

              end;

var HHPoints: record

              First, Last: word;

              ar: array[1..Pred(cMaxSpawnPoints)] of TPoint

              end = (First: 1);

procedure BlitImageAndGenerateCollisionInfo(cpX, cpY: Longword; Image, Surface: PSDL_Surface);

var i, p: LongWord;

    x, y: Longword;

    bpp: integer;

    r: TSDL_Rect;

begin

r.x:= cpX;

r.y:= cpY;

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

WriteToConsole('Generating collision info... ');

if SDL_MustLock(Image) then

   SDLTry(SDL_LockSurface(Image) >= 0, true);

bpp:= Image.format.BytesPerPixel;

WriteToConsole('('+inttostr(bpp)+') ');

p:= LongWord(Image.pixels);

case bpp of

     1: OutError('We don''t work with 8 bit surfaces', true);

     2: for y:= 0 to Pred(Image.h) do

            begin

            i:= Longword(@Land[cpY + y, cpX]);

            for x:= 0 to Pred(Image.w) do

                if PWord(p + x * 2)^ = 0 then PLongWord(i + x * 4)^:= 0

                                         else PLongWord(i + x * 4)^:= 1;

            inc(p, Image.pitch);

            end;

     3: for y:= 0 to Pred(Image.h) do

            begin

            i:= Longword(@Land[cpY + y, cpX]);

            for x:= 0 to Pred(Image.w) do

                if  (PByte(p + x * 3 + 0)^ = 0)

                and (PByte(p + x * 3 + 1)^ = 0)

                and (PByte(p + x * 3 + 2)^ = 0) then PLongWord(i + x * 4)^:= 0

                                                else PLongWord(i + x * 4)^:= 1;

            inc(p, Image.pitch);

            end;

     4: for y:= 0 to Pred(Image.h) do

            begin

            i:= Longword(@Land[cpY + y, cpX]);

            for x:= 0 to Pred(Image.w) do

                if PLongword(p + x * 4)^ = 0 then PLongWord(i + x * 4)^:= 0

                                             else PLongWord(i + x * 4)^:= 1;

            inc(p, Image.pitch);

            end;

     end;

if SDL_MustLock(Image) then

   SDL_UnlockSurface(Image);

WriteLnToConsole(msgOK)

end;

procedure DrawBezierEdge(var pa: TPixAr);

var x, y, i: integer;

    tx, ty, vx, vy, vlen, t: real;

    r1, r2, r3, r4: real;

    x1, y1, x2, y2, cx1, cy1, cx2, cy2, tsq, tcb: real;

begin

vx:= 0;

vy:= 0;

with pa do

for i:= 0 to Count-2 do

    begin

    vlen:= sqrt(sqr(ar[i + 1].x - ar[i    ].X) + sqr(ar[i + 1].y - ar[i    ].y));

    t:=    sqrt(sqr(ar[i + 1].x - ar[i + 2].X) + sqr(ar[i + 1].y - ar[i + 2].y));

    if t<vlen then vlen:= t;

    vlen:= vlen/3;

    tx:= ar[i+2].X - ar[i].X;

    ty:= ar[i+2].y - ar[i].y;

    t:= sqrt(sqr(tx)+sqr(ty));

    if t = 0 then

       begin

       tx:= -tx * 100000;

       ty:= -ty * 100000;

       end else

       begin

       tx:= -tx/t;

       ty:= -ty/t;

       end;

    t:= 1.0*vlen;

    tx:= tx*t;

    ty:= ty*t;

    x1:= ar[i].x;

    y1:= ar[i].y;

    x2:= ar[i + 1].x;

    y2:= ar[i + 1].y;

    cx1:= ar[i].X   + trunc(vx);

    cy1:= ar[i].y   + trunc(vy);

    cx2:= ar[i+1].X + trunc(tx);

    cy2:= ar[i+1].y + trunc(ty);

    vx:= -tx;

    vy:= -ty;

    t:= 0;

    while t <= 1.0 do

          begin

          tsq:= sqr(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:= round(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:= round(r1 + r2 + r3 + r4);

          t:= t + 0.001;

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

                Land[y, x]:= $FFFFFF;

          end;

    end;

end;

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

var x, y, i: integer;

    tx, ty, vx, vy, vlen, t: real;

    r1, r2, r3, r4: real;

    x1, y1, x2, y2, cx1, cy1, cx2, cy2, tsq, tcb: real;

    opa: TPixAr;

begin

opa:= pa;

pa.Count:= 0;

vx:= 0;

vy:= 0;

with opa do

for i:= 0 to Count-2 do

    begin

    vlen:= sqrt(sqr(ar[i + 1].x - ar[i    ].X) + sqr(ar[i + 1].y - ar[i    ].y));

    t:=    sqrt(sqr(ar[i + 1].x - ar[i + 2].X) + sqr(ar[i + 1].y - ar[i + 2].y));

    if t<vlen then vlen:= t;

    vlen:= vlen/3;

    tx:= ar[i+2].X - ar[i].X;

    ty:= ar[i+2].y - ar[i].y;

    t:= sqrt(sqr(tx)+sqr(ty));

    if t = 0 then

       begin

       tx:= -tx * 100000;

       ty:= -ty * 100000;

       end else

       begin

       tx:= -tx/t;

       ty:= -ty/t;

       end;

    t:= 1.0*vlen;

    tx:= tx*t;

    ty:= ty*t;

    x1:= ar[i].x;

    y1:= ar[i].y;

    x2:= ar[i + 1].x;

    y2:= ar[i + 1].y;

    cx1:= ar[i].X   + trunc(vx);

    cy1:= ar[i].y   + trunc(vy);

    cx2:= ar[i+1].X + trunc(tx);

    cy2:= ar[i+1].y + trunc(ty);

    vx:= -tx;

    vy:= -ty;

    t:= 0;

    while t <= 1.0 do

          begin

          tsq:= sqr(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:= round(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:= round(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;

    end;

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

    _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);

    TryDo(Stack.Count < 8192, 'stack overflow', true)

    end;

    procedure Pop(out _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;

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]:= $FFFFFF;

                  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[ptThemeCurrent] + 'LandTex.png');

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[ptThemeCurrent] + 'Border.png');

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 AddGirders(Surface: PSDL_Surface);

var tmpsurf: PSDL_Surface;

    x1, x2, y, k, i: integer;

    r, rr: TSDL_Rect;

    function CountNonZeroz(x, y: integer): Longword;

    var i: integer;

    begin

    Result:= 0;

    for i:= y to y + 15 do

        if Land[i, x] <> 0 then inc(Result)

    end;

begin

y:= 256;

repeat

  inc(y, 24);

  x1:= 1024;

  x2:= 1024;

  while (x1 > 100) and (CountNonZeroz(x1, y) = 0) do dec(x1, 2);

  i:= x1 - 12;

  repeat

    k:= CountNonZeroz(x1, y);

    dec(x1, 2)

  until (x1 < 100) or (k = 0) or (k = 16) or (x1 < i);

  inc(x1, 2);

  if k = 16 then

     begin

     while (x2 < 1900) and (CountNonZeroz(x2, y) = 0) do inc(x2, 2);

     i:= x2 + 12;

     repeat

       k:= CountNonZeroz(x2, y);

       inc(x2, 2)

     until (x2 > 1900) or (k = 0) or (k = 16) or (x2 > i);

     if (x2 < 1900) and (k = 16) and (x2 - x1 > 250) then break;

     end;

x1:= 0;

until y > 900;

if x1 > 0 then

   begin

   tmpsurf:= LoadImage(Pathz[ptGraphics] + 'Girder.png');

   rr.x:= x1;

   rr.y:= y;

   while rr.x + 100 < x2 do

         begin

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

         inc(rr.x, 100);

         end;

   r.x:= 0;

   r.y:= 0;

   r.w:= x2 - rr.x;

   r.h:= 16;

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

   SDL_FreeSurface(tmpsurf);

   for k:= y to y + 15 do

       for i:= x1 to x2 do Land[k, i]:= $FFFFFF

   end

end;

procedure AddHHPoints;

var x, y, t: integer;

    function CountNonZeroz(x, y: integer): integer;

    var i: integer;

    begin

    Result:= 0;

    if (y and $FFFFFC00) <> 0 then exit;

        if Land[y, i] <> 0 then inc(Result)

    end;

begin

x:= 40;

while x < 2010 do

    begin

    y:= -24;

    while y < 1023 do

          begin

          repeat

          inc(y, 2);

          until (y > 1023) or (CountNonZeroz(x, y) = 0);

          t:= 0;

          repeat

          inc(y, 2);

          inc(t, 2)

          until (y > 1023) or (CountNonZeroz(x, y) <> 0);

          if (t > 22) and (y < 1023) then AddHHPoint(x, y - 12);

          inc(y, 100)

          end;

    inc(x, 120)

    end;

if HHPoints.Last < cMaxHHs then

   begin

   AddHHPoint(300, 800);

   AddHHPoint(400, 800);

   AddHHPoint(500, 800);

   AddHHPoint(600, 800);

   AddHHPoint(700, 800);

   AddHHPoint(800, 800);

   AddHHPoint(900, 800);

   AddHHPoint(1000, 800);

   AddHHPoint(1100, 800);

   AddHHPoint(1200, 800);

   AddHHPoint(1300, 800);

   AddHHPoint(1400, 800);

   end;

end;

    i, k: integer;

    rx, ry, oy: real;

begin