hedgewars/uCollisions.pas
author nemo
Tue, 11 May 2010 13:59:57 +0000
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child 3473 f80431269806
permissions -rw-r--r--
hey sheepluva, how about just this? lets you have an anonymous one too.
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2005-2010 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 *)
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{$INCLUDE "options.inc"}
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unit uCollisions;
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interface
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uses uGears, uFloat;
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const cMaxGearArrayInd = 255;
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type PGearArray = ^TGearArray;
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    TGearArray = record
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            ar: array[0..cMaxGearArrayInd] of PGear;
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            Count: Longword
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            end;
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procedure initModule;
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procedure freeModule;
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procedure AddGearCI(Gear: PGear);
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procedure DeleteCI(Gear: PGear);
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function  CheckGearsCollision(Gear: PGear): PGearArray;
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function  TestCollisionXwithGear(Gear: PGear; Dir: LongInt): boolean;
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function  TestCollisionYwithGear(Gear: PGear; Dir: LongInt): boolean;
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function  TestCollisionXKick(Gear: PGear; Dir: LongInt): boolean;
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function  TestCollisionYKick(Gear: PGear; Dir: LongInt): boolean;
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function  TestCollisionY(Gear: PGear; Dir: LongInt): boolean;
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function  TestCollisionXwithXYShift(Gear: PGear; ShiftX: hwFloat; ShiftY: LongInt; Dir: LongInt): boolean;
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function  TestCollisionYwithXYShift(Gear: PGear; ShiftX, ShiftY: LongInt; Dir: LongInt): boolean;
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function  calcSlopeTangent(Gear: PGear; collisionX, collisionY: LongInt; var outDeltaX, outDeltaY: LongInt; TestWord: LongWord): Boolean;
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implementation
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uses uMisc, uConsts, uLand, uLandGraphics;
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type TCollisionEntry = record
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            X, Y, Radius: LongInt;
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            cGear: PGear;
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            end;
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const MAXRECTSINDEX = 511;
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var Count: Longword;
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    cinfos: array[0..MAXRECTSINDEX] of TCollisionEntry;
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    ga: TGearArray;
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procedure AddGearCI(Gear: PGear);
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begin
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if Gear^.CollisionIndex >= 0 then exit;
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TryDo(Count <= MAXRECTSINDEX, 'Collision rects array overflow', true);
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with cinfos[Count] do
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    begin
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    X:= hwRound(Gear^.X);
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    Y:= hwRound(Gear^.Y);
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    Radius:= Gear^.Radius;
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    ChangeRoundInLand(X, Y, Radius - 1, true);
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    cGear:= Gear
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    end;
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Gear^.CollisionIndex:= Count;
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inc(Count)
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end;
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procedure DeleteCI(Gear: PGear);
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begin
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if Gear^.CollisionIndex >= 0 then
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    begin
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    with cinfos[Gear^.CollisionIndex] do
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        ChangeRoundInLand(X, Y, Radius - 1, false);
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    cinfos[Gear^.CollisionIndex]:= cinfos[Pred(Count)];
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    cinfos[Gear^.CollisionIndex].cGear^.CollisionIndex:= Gear^.CollisionIndex;
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    Gear^.CollisionIndex:= -1;
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    dec(Count)
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    end;
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end;
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function CheckGearsCollision(Gear: PGear): PGearArray;
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var mx, my: LongInt;
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    i: Longword;
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begin
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CheckGearsCollision:= @ga;
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ga.Count:= 0;
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if Count = 0 then exit;
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mx:= hwRound(Gear^.X);
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my:= hwRound(Gear^.Y);
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for i:= 0 to Pred(Count) do
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    with cinfos[i] do
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        if (Gear <> cGear) and
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            (sqr(mx - x) + sqr(my - y) <= sqr(Radius + Gear^.Radius)) then
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                begin
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                ga.ar[ga.Count]:= cinfos[i].cGear;
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                inc(ga.Count)
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                end
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end;
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function TestCollisionXwithGear(Gear: PGear; Dir: LongInt): boolean;
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var x, y, i: LongInt;
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    TestWord: LongWord;
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begin
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if Gear^.IntersectGear <> nil then
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   with Gear^ do
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        if (hwRound(IntersectGear^.X) + IntersectGear^.Radius < hwRound(X) - Radius) or
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           (hwRound(IntersectGear^.X) - IntersectGear^.Radius > hwRound(X) + Radius) then
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           begin
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           IntersectGear:= nil;
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           TestWord:= 0
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           end else
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           TestWord:= 255
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   else TestWord:= 0;
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x:= hwRound(Gear^.X);
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if Dir < 0 then x:= x - Gear^.Radius
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           else x:= x + Gear^.Radius;
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if (x and LAND_WIDTH_MASK) = 0 then
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   begin
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   y:= hwRound(Gear^.Y) - Gear^.Radius + 1;
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   i:= y + Gear^.Radius * 2 - 2;
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   repeat
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     if (y and LAND_HEIGHT_MASK) = 0 then
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        if Land[y, x] > TestWord then exit(true);
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     inc(y)
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   until (y > i);
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   end;
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TestCollisionXwithGear:= false
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end;
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function TestCollisionYwithGear(Gear: PGear; Dir: LongInt): boolean;
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var x, y, i: LongInt;
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    TestWord: LongWord;
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begin
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if Gear^.IntersectGear <> nil then
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   with Gear^ do
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        if (hwRound(IntersectGear^.Y) + IntersectGear^.Radius < hwRound(Y) - Radius) or
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           (hwRound(IntersectGear^.Y) - IntersectGear^.Radius > hwRound(Y) + Radius) then
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           begin
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           IntersectGear:= nil;
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           TestWord:= 0
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           end else
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           TestWord:= 255
505
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   else TestWord:= 0;
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y:= hwRound(Gear^.Y);
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if Dir < 0 then y:= y - Gear^.Radius
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           else y:= y + Gear^.Radius;
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if (y and LAND_HEIGHT_MASK) = 0 then
505
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   begin
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   x:= hwRound(Gear^.X) - Gear^.Radius + 1;
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   i:= x + Gear^.Radius * 2 - 2;
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   repeat
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     if (x and LAND_WIDTH_MASK) = 0 then
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        if Land[y, x] > TestWord then exit(true);
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     inc(x)
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   until (x > i);
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   end;
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TestCollisionYwithGear:= false
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end;
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function TestCollisionXKick(Gear: PGear; Dir: LongInt): boolean;
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var x, y, mx, my, i: LongInt;
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    flag: boolean;
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begin
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flag:= false;
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x:= hwRound(Gear^.X);
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if Dir < 0 then x:= x - Gear^.Radius
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           else x:= x + Gear^.Radius;
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if (x and LAND_WIDTH_MASK) = 0 then
513
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   begin
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   y:= hwRound(Gear^.Y) - Gear^.Radius + 1;
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   i:= y + Gear^.Radius * 2 - 2;
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   repeat
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     if (y and LAND_HEIGHT_MASK) = 0 then
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           if Land[y, x] > 255 then exit(true)
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           else if Land[y, x] <> 0 then flag:= true;
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     inc(y)
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   until (y > i);
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   end;
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TestCollisionXKick:= flag;
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if flag then
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   begin
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   if hwAbs(Gear^.dX) < cHHKick then exit;
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   if (Gear^.State and gstHHJumping <> 0)
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   and (hwAbs(Gear^.dX) < _0_4) then exit;
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   mx:= hwRound(Gear^.X);
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   my:= hwRound(Gear^.Y);
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   for i:= 0 to Pred(Count) do
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    with cinfos[i] do
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      if (Gear <> cGear) and
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         (sqr(mx - x) + sqr(my - y) <= sqr(Radius + Gear^.Radius + 2)) and
517
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         ((mx > x) xor (Dir > 0)) then
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         if (cGear^.Kind in [gtHedgehog, gtMine, gtExplosives]) and ((Gear^.State and gstNotKickable) = 0) then
513
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             begin
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             with cGear^ do
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                  begin
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                  dX:= Gear^.dX;
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                  dY:= Gear^.dY * _0_5;
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                  State:= State or gstMoving;
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                  Active:= true
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                  end;
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             DeleteCI(cGear);
538
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             exit(false)
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             end
513
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   end
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end;
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   227
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function TestCollisionYKick(Gear: PGear; Dir: LongInt): boolean;
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var x, y, mx, my, i: LongInt;
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    flag: boolean;
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begin
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flag:= false;
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y:= hwRound(Gear^.Y);
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if Dir < 0 then y:= y - Gear^.Radius
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           else y:= y + Gear^.Radius;
1753
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if (y and LAND_HEIGHT_MASK) = 0 then
513
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   begin
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   x:= hwRound(Gear^.X) - Gear^.Radius + 1;
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   i:= x + Gear^.Radius * 2 - 2;
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   repeat
1753
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     if (x and LAND_WIDTH_MASK) = 0 then
513
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        if Land[y, x] > 0 then
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           if Land[y, x] > 255 then exit(true)
536
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           else if Land[y, x] <> 0 then flag:= true;
513
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     inc(x)
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   until (x > i);
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   247
   end;
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TestCollisionYKick:= flag;
513
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   249
536
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   250
if flag then
513
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   begin
839
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   252
   if hwAbs(Gear^.dY) < cHHKick then exit(true);
967
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   253
   if (Gear^.State and gstHHJumping <> 0)
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   254
   and (not Gear^.dY.isNegative)
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   255
   and (Gear^.dY < _0_4) then exit;
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   256
513
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   mx:= hwRound(Gear^.X);
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   258
   my:= hwRound(Gear^.Y);
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   259
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   260
   for i:= 0 to Pred(Count) do
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   261
    with cinfos[i] do
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   262
      if (Gear <> cGear) and
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         (sqr(mx - x) + sqr(my - y) <= sqr(Radius + Gear^.Radius + 2)) and
513
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   264
         ((my > y) xor (Dir > 0)) then
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   265
         if (cGear^.Kind in [gtHedgehog, gtMine, gtExplosives]) and ((Gear^.State and gstNotKickable) = 0) then
513
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   266
             begin
521
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   267
             with cGear^ do
513
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   268
                  begin
542
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   269
                  dX:= Gear^.dX * _0_5;
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                  dY:= Gear^.dY;
521
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   271
                  State:= State or gstMoving;
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                  Active:= true
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   273
                  end;
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   274
             DeleteCI(cGear);
538
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             exit(false)
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   276
             end
513
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   277
   end
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   278
end;
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   279
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   280
function TestCollisionXwithXYShift(Gear: PGear; ShiftX: hwFloat; ShiftY: LongInt; Dir: LongInt): boolean;
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begin
351
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   282
Gear^.X:= Gear^.X + ShiftX;
498
9c8b385dc9a1 - Get rid of operator := to have GPC support
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   283
Gear^.Y:= Gear^.Y + int2hwFloat(ShiftY);
351
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   284
TestCollisionXwithXYShift:= TestCollisionXwithGear(Gear, Dir);
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   285
Gear^.X:= Gear^.X - ShiftX;
498
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   286
Gear^.Y:= Gear^.Y - int2hwFloat(ShiftY)
4
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   287
end;
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   288
371
731ad6d27bd1 integer -> LongInt
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   289
function TestCollisionY(Gear: PGear; Dir: LongInt): boolean;
731ad6d27bd1 integer -> LongInt
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   290
var x, y, i: LongInt;
68
cbb93eb90304 Collision-related stuff
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   291
begin
351
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   292
y:= hwRound(Gear^.Y);
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   293
if Dir < 0 then y:= y - Gear^.Radius
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   294
           else y:= y + Gear^.Radius;
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   295
if (y and LAND_HEIGHT_MASK) = 0 then
68
cbb93eb90304 Collision-related stuff
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diff changeset
   296
   begin
351
29bc9c36ad5f Fixed-point arithmetics in engine.
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   297
   x:= hwRound(Gear^.X) - Gear^.Radius + 1;
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   298
   i:= x + Gear^.Radius * 2 - 2;
68
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   299
   repeat
1753
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   300
     if (x and LAND_WIDTH_MASK) = 0 then
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        if Land[y, x] > 255 then exit(true);
68
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   302
     inc(x)
351
29bc9c36ad5f Fixed-point arithmetics in engine.
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   303
   until (x > i);
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   304
   end;
29bc9c36ad5f Fixed-point arithmetics in engine.
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   305
TestCollisionY:= false
68
cbb93eb90304 Collision-related stuff
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diff changeset
   306
end;
cbb93eb90304 Collision-related stuff
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   307
371
731ad6d27bd1 integer -> LongInt
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   308
function TestCollisionYwithXYShift(Gear: PGear; ShiftX, ShiftY: LongInt; Dir: LongInt): boolean;
4
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   309
begin
498
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   310
Gear^.X:= Gear^.X + int2hwFloat(ShiftX);
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   311
Gear^.Y:= Gear^.Y + int2hwFloat(ShiftY);
351
29bc9c36ad5f Fixed-point arithmetics in engine.
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   312
TestCollisionYwithXYShift:= TestCollisionYwithGear(Gear, Dir);
498
9c8b385dc9a1 - Get rid of operator := to have GPC support
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   313
Gear^.X:= Gear^.X - int2hwFloat(ShiftX);
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   314
Gear^.Y:= Gear^.Y - int2hwFloat(ShiftY)
4
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   315
end;
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   316
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   317
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   318
function calcSlopeTangent(Gear: PGear; collisionX, collisionY: LongInt; var outDeltaX, outDeltaY: LongInt; TestWord: LongWord): boolean;
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   319
var ldx, ldy, rdx, rdy: LongInt;
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   320
    i, j, mx, my, li, ri, jfr, jto, tmpo : ShortInt;
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   321
    tmpx, tmpy: LongWord;
3408
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   322
    dx, dy: hwFloat;
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   323
    offset: Array[0..7,0..1] of ShortInt;
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   324
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   325
begin
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   326
    dx:= Gear^.dX;
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   327
    dy:= Gear^.dY;
3408
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   328
56e636b83cb4 tweak land angle detection/portal a bit
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   329
    // we start searching from the direction the gear center is at
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   330
    mx:= hwRound(Gear^.X-dx) - hwRound(Gear^.X);
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   331
    my:= hwRound(Gear^.Y-dy) - hwRound(Gear^.Y);
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   332
56e636b83cb4 tweak land angle detection/portal a bit
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   333
    li:= -1;
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   334
    ri:= -1;
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   335
    
3408
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   336
    // go around collision pixel, checking for first/last collisions
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   337
    // this will determinate what angles will be tried to crawl along
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   338
    for i:= 0 to 7 do
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   339
        begin
3408
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   340
        offset[i,0]:= mx;
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   341
        offset[i,1]:= my;
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   342
        
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   343
        tmpx:= collisionX + mx;
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   344
        tmpy:= collisionY + my;
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   345
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   346
        if (((tmpy) and LAND_HEIGHT_MASK) = 0) and (((tmpx) and LAND_WIDTH_MASK)  = 0) then
56e636b83cb4 tweak land angle detection/portal a bit
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   347
            if (Land[tmpy,tmpx] > TestWord) then
56e636b83cb4 tweak land angle detection/portal a bit
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   348
                begin
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   349
                // remember the index belonging to the first and last collision (if in 1st half)
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   350
                if (i <> 0) then
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   351
                    begin
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   352
                    if (ri = -1) then
56e636b83cb4 tweak land angle detection/portal a bit
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   353
                        ri:= i
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   354
                    else
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   355
                        li:= i;
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   356
                    end;
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   357
                end;
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   358
3408
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   359
        if i = 7 then break;
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   360
3408
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   361
        // prepare offset for next check (clockwise)
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   362
        if (mx = -1) and (my <> -1) then my:= my - 1
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   363
        else if (my = -1) and (mx <> 1) then mx:= mx + 1
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   364
        else if (mx = 1) and (my <> 1) then my:= my + 1
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   365
        else mx:= mx - 1;
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   366
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   367
        end;
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   368
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   369
    ldx:= collisionX;
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   370
    ldy:= collisionY;
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   371
    rdx:= collisionX;
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   372
    rdy:= collisionY;
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   373
3408
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   374
    // edge-crawl
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   375
    for i:= 0 to 8 do
3401
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   376
        begin
3408
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   377
        // using mx,my as temporary value buffer here
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diff changeset
   378
        
56e636b83cb4 tweak land angle detection/portal a bit
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   379
        jfr:= 8+li+1;
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   380
        jto:= 8+li-1;
3401
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   381
3408
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diff changeset
   382
        for j:= jfr downto jto do
3401
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   383
            begin
3408
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   384
            tmpo:= j mod 8;
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   385
            tmpx:= ldx + offset[tmpo,0];
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   386
            tmpy:= ldy + offset[tmpo,1];
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   387
            if (((tmpy) and LAND_HEIGHT_MASK) = 0) and (((tmpx) and LAND_WIDTH_MASK)  = 0)
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diff changeset
   388
                and (Land[tmpy,tmpx] > TestWord) then
3401
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   389
                    begin
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diff changeset
   390
                    ldx:= tmpx;
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diff changeset
   391
                    ldy:= tmpy;
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diff changeset
   392
                    break;
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diff changeset
   393
                    end;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
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diff changeset
   394
            end;
3408
56e636b83cb4 tweak land angle detection/portal a bit
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diff changeset
   395
56e636b83cb4 tweak land angle detection/portal a bit
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diff changeset
   396
        jfr:= 8+ri-1;
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diff changeset
   397
        jto:= 8+ri+1;
3401
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sheepluva
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diff changeset
   398
3408
56e636b83cb4 tweak land angle detection/portal a bit
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diff changeset
   399
        for j:= jfr to jto do
3401
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
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diff changeset
   400
            begin
3408
56e636b83cb4 tweak land angle detection/portal a bit
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diff changeset
   401
            tmpo:= j mod 8;
56e636b83cb4 tweak land angle detection/portal a bit
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diff changeset
   402
            tmpx:= rdx + offset[tmpo,0];
56e636b83cb4 tweak land angle detection/portal a bit
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diff changeset
   403
            tmpy:= rdy + offset[tmpo,1];
56e636b83cb4 tweak land angle detection/portal a bit
sheepluva
parents: 3407
diff changeset
   404
            if (((tmpy) and LAND_HEIGHT_MASK) = 0) and (((tmpx) and LAND_WIDTH_MASK)  = 0)
56e636b83cb4 tweak land angle detection/portal a bit
sheepluva
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diff changeset
   405
                and (Land[tmpy,tmpx] > TestWord) then
3401
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sheepluva
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diff changeset
   406
                    begin
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
parents: 3236
diff changeset
   407
                    rdx:= tmpx;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
parents: 3236
diff changeset
   408
                    rdy:= tmpy;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
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diff changeset
   409
                    break;
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sheepluva
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diff changeset
   410
                    end;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
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diff changeset
   411
            end;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
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diff changeset
   412
        end;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
parents: 3236
diff changeset
   413
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
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diff changeset
   414
    ldx:= rdx - ldx;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
parents: 3236
diff changeset
   415
    ldy:= rdy - ldy;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
parents: 3236
diff changeset
   416
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
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diff changeset
   417
    if ((ldx = 0) and (ldy = 0)) then EXIT(false);
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diff changeset
   418
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sheepluva
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diff changeset
   419
outDeltaX:= ldx;
b2f3bb44777e some portal changes, warning: no loop prevention yet, note: entry angle not preserved yet
sheepluva
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diff changeset
   420
outDeltaY:= ldy;
3408
56e636b83cb4 tweak land angle detection/portal a bit
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diff changeset
   421
exit(true);
3401
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
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diff changeset
   422
end;
d5d31d16eccc add a part of my landslide vector collision and use if for the portal gun DirAngle, not flawless yet
sheepluva
parents: 3236
diff changeset
   423
3038
4e48c276a468 In pascal unit is a namespace
unc0rr
parents: 2948
diff changeset
   424
procedure initModule;
2716
b9ca1bfca24f complete the replacement of init/free wrappers for every unit
koda
parents: 2630
diff changeset
   425
begin
2948
3f21a9dc93d0 Replace tabs with spaces using 'expand -t 4' command
unc0rr
parents: 2716
diff changeset
   426
    Count:= 0;
2716
b9ca1bfca24f complete the replacement of init/free wrappers for every unit
koda
parents: 2630
diff changeset
   427
end;
b9ca1bfca24f complete the replacement of init/free wrappers for every unit
koda
parents: 2630
diff changeset
   428
3038
4e48c276a468 In pascal unit is a namespace
unc0rr
parents: 2948
diff changeset
   429
procedure freeModule;
2716
b9ca1bfca24f complete the replacement of init/free wrappers for every unit
koda
parents: 2630
diff changeset
   430
begin
b9ca1bfca24f complete the replacement of init/free wrappers for every unit
koda
parents: 2630
diff changeset
   431
b9ca1bfca24f complete the replacement of init/free wrappers for every unit
koda
parents: 2630
diff changeset
   432
end;
b9ca1bfca24f complete the replacement of init/free wrappers for every unit
koda
parents: 2630
diff changeset
   433
4
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
   434
end.