unit uLandObjects;

interface

uses SDLh;

{$include options.inc}

procedure AddObjects(Surface: PSDL_Surface);

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

implementation

uses uLand, uStore, uConsts, uMisc, uConsole, uRandom;

type  PRectArray = ^TRectsArray;

      TRectsArray = array[0..MaxRects] of TSDL_rect;

type TThemeObject = record

                    Surf: PSDL_Surface;

                    inland: TSDL_Rect;

                    outland: array[1..MAXOBJECTRECTS] of TSDL_Rect;

                    rectcnt: Longword;

                    Width, Height: Longword;

                    end;

var Rects: PRectArray;

    RectCount: Longword;

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)^:= $FFFFFF;

            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)

                 or (PByte(p + x * 3 + 1)^ <> 0)

                 or (PByte(p + x * 3 + 2)^ <> 0) then PLongWord(i + x * 4)^:= $FFFFFF;

            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)^:= $FFFFFF;

            inc(p, Image.pitch);

            end;

     end;

if SDL_MustLock(Image) then

   SDL_UnlockSurface(Image);

WriteLnToConsole(msgOK)

end;

procedure AddRect(x1, y1, w1, h1: integer);

begin

with Rects[RectCount] do

     begin

     x:= x1;

     y:= y1;

     w:= w1;

     h:= h1

     end;

inc(RectCount);

TryDo(RectCount < MaxRects, 'AddRect: overflow', true)

end;

procedure InitRects;

begin

RectCount:= 0;

New(Rects)

end;

procedure FreeRects;

begin

Dispose(rects)

end;

function CheckIntersect(x1, y1, w1, h1: integer): boolean;

var i: Longword;

begin

Result:= false;

i:= 0;

if RectCount > 0 then

   repeat

   with Rects[i] do

        Result:= (x < x1 + w1) and (x1 < x + w) and

                 (y < y1 + h1) and (y1 < y + h);

   inc(i)

   until (i = RectCount) or (Result)

end;

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

repeat

  inc(y, 24);

  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)

        and not CheckIntersect(x1, y, x2 - x1, 16) 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;

function CheckLand(rect: TSDL_Rect; dX, dY, Color: Longword): boolean;

var i: Longword;

begin

Result:= true;

inc(rect.x, dX);

inc(rect.y, dY);

i:= 0;

{$WARNINGS OFF}

while (i <= rect.w) and Result do

      begin

      Result:= (Land[rect.y, rect.x + i] = Color) and (Land[rect.y + rect.h, rect.x + i] = Color);

      inc(i)

      end;

i:= 0;

while (i <= rect.h) and Result do

      begin

      inc(i)

      end;

{$WARNINGS ON}

end;

function CheckCanPlace(x, y: Longword; var Obj: TThemeObject): boolean;

var i: Longword;

begin

with Obj do

     if CheckLand(inland, x, y, $FFFFFF) then

        begin

        Result:= true;

        i:= 1;

        while Result and (i <= rectcnt) do

              begin

              Result:= CheckLand(outland[i], x, y, 0);

              inc(i)

              end;

        if Result then

           Result:= not CheckIntersect(x, y, Width, Height)

        end else

        Result:= false

end;

function TryPut(var Obj: TThemeObject; Surface: PSDL_Surface): boolean;

const MaxPointsIndex = 2047;

var x, y: Longword;

    ar: array[0..MaxPointsIndex] of TPoint;

    cnt, i: Longword;

begin

cnt:= 0;

with Obj do

     begin

     x:= 0;

     repeat

         y:= 0;

         repeat

             if CheckCanPlace(x, y, Obj) then

                begin

                ar[cnt].x:= x;

                ar[cnt].y:= y;

                inc(cnt);

                if cnt > MaxPointsIndex then // buffer is full, do not check the rest land

                   begin

                   y:= 5000;

                   x:= 5000;

                   end

                end;

         until y > 1023 - Height;

     until x > 2047 - Width;

     Result:= cnt <> 0;

     if Result then

        begin

        i:= getrandom(cnt);

        BlitImageAndGenerateCollisionInfo(ar[i].x, ar[i].y, Obj.Surf, Surface);

        AddRect(ar[i].x, ar[i].y, Width, Height);

        end

     end

end;

procedure AddThemeObjects(Surface: PSDL_Surface; MaxCount: Longword);

var f: textfile;

    s: string;

    ThemeObjects: array[1..MAXTHEMEOBJECTS] of TThemeObject;

    i, ii, t, n: Longword;

    b: boolean;

begin

s:= Pathz[ptThemeCurrent] + cThemeCFGFilename;

WriteLnToConsole('Adding objects...');

AssignFile(f, s);

{$I-}

Reset(f);

Readln(f, s); // skip color

Readln(f, n);

for i:= 1 to n do

    begin

    Readln(f, s); // filename

    with ThemeObjects[i] do

         begin

         Surf:= LoadImage(Pathz[ptThemeCurrent] + s + '.png');

         Read(f, Width, Height);

         with inland do Read(f, x, y, w, h);

         Read(f, rectcnt);

         for ii:= 1 to rectcnt do

             with outland[ii] do Read(f, x, y, w, h);

         ReadLn(f)

         end;

    end;

Closefile(f);

{$I+}

TryDo(IOResult = 0, 'Bad data or cannot access file', true);

// loaded objects, try to put on land

if n = 0 then exit;

i:= 1;

repeat

    t:= getrandom(n) + 1;

    ii:= t;

    repeat

      inc(ii);

      if ii > n then ii:= 1;

      b:= TryPut(ThemeObjects[ii], Surface)

    until b or (ii = t);

inc(i)

until (i > MaxCount) or not b

end;

procedure AddObjects(Surface: PSDL_Surface);

begin

InitRects;

FreeRects

end;

end.