(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2005-2010 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

 *)

{$INCLUDE "options.inc"}

unit uLandObjects;

interface

uses SDLh;

procedure AddObjects();

procedure FreeLandObjects();

procedure LoadThemeConfig;

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

procedure AddOnLandObjects(Surface: PSDL_Surface);

implementation

uses uStore, uConsts, uConsole, uRandom, uVisualGears, uSound, GLunit,

const MaxRects = 512;

      MAXOBJECTRECTS = 16;

      MAXTHEMEOBJECTS = 32;

type PRectArray = ^TRectsArray;

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

     TThemeObject = record

                    Surf: PSDL_Surface;

                    inland: TSDL_Rect;

                    outland: array[0..Pred(MAXOBJECTRECTS)] of TSDL_Rect;

                    rectcnt: Longword;

                    Width, Height: Longword;

                    Maxcnt: Longword;

                    end;

     TThemeObjects = record

                     Count: LongInt;

                     objs: array[0..Pred(MAXTHEMEOBJECTS)] of TThemeObject;

                     end;

     TSprayObject = record

                    Surf: PSDL_Surface;

                    Width, Height: Longword;

                    Maxcnt: Longword;

                    end;

     TSprayObjects = record

                     Count: LongInt;

                     objs: array[0..Pred(MAXTHEMEOBJECTS)] of TSprayObject

                     end;

var Rects: PRectArray;

    RectCount: Longword;

    ThemeObjects: TThemeObjects;

    SprayObjects: TSprayObjects;

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

var p: PLongwordArray;

    x, y: Longword;

    bpp: LongInt;

begin

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

if SDL_MustLock(Image) then

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

bpp:= Image^.format^.BytesPerPixel;

TryDo(bpp = 4, 'Land object should be 32bit', true);

if Width = 0 then Width:= Image^.w;

p:= Image^.pixels;

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

    begin

    for x:= 0 to Pred(Width) do

        begin

            if (cReducedQuality and rqBlurryLand) = 0 then

            begin

                if LandPixels[cpY + y, cpX + x] = 0 then

                    LandPixels[cpY + y, cpX + x]:= p^[x];

            end

            else

                if LandPixels[(cpY + y) div 2, (cpX + x) div 2] = 0 then

                    LandPixels[(cpY + y) div 2, (cpX + x) div 2]:= p^[x];

        if ((Land[cpY + y, cpX + x] and $FF00) = 0) and ((p^[x] and AMask) <> 0) then

            Land[cpY + y, cpX + x]:= lfObject

        end;

    p:= @(p^[Image^.pitch shr 2])

    end;

if SDL_MustLock(Image) then

   SDL_UnlockSurface(Image);

WriteLnToConsole(msgOK)

end;

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

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: LongInt): boolean;

var i: Longword;

    res: boolean = false;

begin

i:= 0;

if RectCount > 0 then

   repeat

   with Rects^[i] do

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

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

   inc(i)

   until (i = RectCount) or (res);

CheckIntersect:= res;

end;

function AddGirder(gX: LongInt): boolean;

var tmpsurf: PSDL_Surface;

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

    rr: TSDL_Rect;

    bRes: boolean;

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

    var i: LongInt;

        lRes: Longword;

    begin

    lRes:= 0;

    for i:= y to y + 15 do

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

    CountNonZeroz:= lRes;

    end;

begin

y:= topY+150;

repeat

    inc(y, 24);

    x1:= gX;

    x2:= gX;

    while (x1 > Longint(leftX)+150) and (CountNonZeroz(x1, y) = 0) do dec(x1, 2);

    i:= x1 - 12;

    repeat

        dec(x1, 2);

        k:= CountNonZeroz(x1, y)

    until (x1 < Longint(leftX)+150) or (k = 0) or (k = 16) or (x1 < i);

    inc(x1, 2);

    if k = 16 then

        begin

        while (x2 < (rightX-150)) and (CountNonZeroz(x2, y) = 0) do inc(x2, 2);

        i:= x2 + 12;

        repeat

        inc(x2, 2);

        k:= CountNonZeroz(x2, y)

        until (x2 >= (rightX-150)) or (k = 0) or (k = 16) or (x2 > i) or (x2 - x1 >= 768);

        if (x2 < (rightX - 150)) and (k = 16) and (x2 - x1 > 250) and (x2 - x1 < 768)

            and not CheckIntersect(x1 - 32, y - 64, x2 - x1 + 64, 144) then break;

        end;

x1:= 0;

until y > (LAND_HEIGHT-125);

if x1 > 0 then

begin

    bRes:= true;

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

    if tmpsurf = nil then tmpsurf:= LoadImage(Pathz[ptGraphics] + '/Girder', ifCritical or ifTransparent or ifIgnoreCaps);

    rr.x:= x1;

    while rr.x < x2 do

        begin

        BlitImageAndGenerateCollisionInfo(rr.x, y, min(x2 - rr.x, tmpsurf^.w), tmpsurf);

        inc(rr.x, tmpsurf^.w);

        end;

    SDL_FreeSurface(tmpsurf);

    AddRect(x1 - 8, y - 32, x2 - x1 + 16, 80);

end

else bRes:= false;

AddGirder:= bRes;

end;

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

var tmpx, tmpx2, tmpy, tmpy2, bx, by: LongInt;

    bRes: boolean = true;

begin

inc(rect.x, dX);

inc(rect.y, dY);

bx:= rect.x + rect.w;

by:= rect.y + rect.h;

{$WARNINGS OFF}

tmpx:= rect.x;

tmpx2:= bx;

while (tmpx <= bx - rect.w div 2 - 1) and bRes do

      begin

      bRes:= ((rect.y and LAND_HEIGHT_MASK) = 0) and ((by and LAND_HEIGHT_MASK) = 0) and

             ((tmpx and LAND_WIDTH_MASK) = 0) and ((tmpx2 and LAND_WIDTH_MASK) = 0) and

             (Land[rect.y, tmpx] = Color) and (Land[by, tmpx] = Color) and

             (Land[rect.y, tmpx2] = Color) and (Land[by, tmpx2] = Color);

      inc(tmpx);

      dec(tmpx2)

      end;

tmpy:= rect.y+1;

tmpy2:= by-1;

while (tmpy <= by - rect.h div 2 - 1) and bRes do

      begin

      bRes:= ((tmpy and LAND_HEIGHT_MASK) = 0) and ((tmpy2 and LAND_HEIGHT_MASK) = 0) and

             ((rect.x and LAND_WIDTH_MASK) = 0) and ((bx and LAND_WIDTH_MASK) = 0) and

             (Land[tmpy, rect.x] = Color) and (Land[tmpy, bx] = Color) and

             (Land[tmpy2, rect.x] = Color) and (Land[tmpy2, bx] = Color);

      inc(tmpy);

      dec(tmpy2)

      end;

{$WARNINGS ON}

CheckLand:= bRes;

end;

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

var i: Longword;

    bRes: boolean;

begin

with Obj do

     if CheckLand(inland, x, y, lfBasic) then

        begin

        bRes:= true;

        i:= 1;

        while bRes and (i <= rectcnt) do

              begin

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

              inc(i)

              end;

        if bRes then

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

        end else

        bRes:= false;

CheckCanPlace:= bRes;

end;

function TryPut(var Obj: TThemeObject): boolean; overload;

const MaxPointsIndex = 2047;

var x, y: Longword;

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

    cnt, i: Longword;

    bRes: boolean;

begin

cnt:= 0;

with Obj do

     begin

     if Maxcnt = 0 then

        exit(false);

     x:= 0;

     repeat

         y:= topY+32; // leave room for a hedgie to teleport in

         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;

             inc(y, 3);

         until y >= LAND_HEIGHT - Height;

         inc(x, getrandom(6) + 3)

     until x >= LAND_WIDTH - Width;

     bRes:= cnt <> 0;

     if bRes then

        begin

        i:= getrandom(cnt);

        BlitImageAndGenerateCollisionInfo(ar[i].x, ar[i].y, 0, Obj.Surf);

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

        dec(Maxcnt)

        end else Maxcnt:= 0

     end;

TryPut:= bRes;

end;

function TryPut(var Obj: TSprayObject; Surface: PSDL_Surface): boolean; overload;

const MaxPointsIndex = 8095;

var x, y: Longword;

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

    cnt, i: Longword;

    r: TSDL_Rect;

    bRes: boolean;

begin

cnt:= 0;

with Obj do

    begin

    if Maxcnt = 0 then

        exit(false);

    x:= 0;

    r.x:= 0;

    r.y:= 0;

    r.w:= Width;

    r.h:= Height + 16;

    repeat

        y:= 8;

        repeat

            if CheckLand(r, x, y - 8, lfBasic)

            and not CheckIntersect(x, y, Width, Height) 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;

            inc(y, 12);

        until y >= LAND_HEIGHT - Height - 8;

        inc(x, getrandom(12) + 12)

    until x >= LAND_WIDTH - Width;

    bRes:= cnt <> 0;

    if bRes then

        begin

        i:= getrandom(cnt);

        r.x:= ar[i].X;

        r.y:= ar[i].Y;

        r.w:= Width;

        r.h:= Height;

        SDL_UpperBlit(Obj.Surf, nil, Surface, @r);

        AddRect(ar[i].x - 32, ar[i].y - 32, Width + 64, Height + 64);

        dec(Maxcnt)

        end else Maxcnt:= 0

    end;

TryPut:= bRes;

end;

procedure ReadThemeInfo(var ThemeObjects: TThemeObjects; var SprayObjects: TSprayObjects);

    f: textfile;

    i, ii, numFlakes: LongInt;

    c1, c2: TSDL_Color;

    procedure CheckRect(Width, Height, x, y, w, h: LongWord);

    begin

    if (x + w > Width) then OutError('Object''s rectangle exceeds image: x + w (' + inttostr(x) + ' + ' + inttostr(w) + ') > Width (' + inttostr(Width) + ')', true);

    if (y + h > Height) then OutError('Object''s rectangle exceeds image: y + h (' + inttostr(y) + ' + ' + inttostr(h) + ') > Height (' + inttostr(Height) + ')', true);

    end;

begin

AddProgress;

s:= Pathz[ptCurrTheme] + '/' + cThemeCFGFilename;

WriteLnToConsole('Reading objects info...');

Assign(f, s);

{$I-}

filemode:= 0; // readonly

Reset(f);

            begin

            Width:= Surf^.w;

            Height:= Surf^.h;

            if (Maxcnt < 1) or (Maxcnt > MAXTHEMEOBJECTS) then OutError('Object''s max count should be between 1 and '+ inttostr(MAXTHEMEOBJECTS) +' (it was '+ inttostr(Maxcnt) +').', true);

            with inland do

                begin

                CheckRect(Width, Height, x, y, w, h)

                end;