(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2011 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 uVisualGears;

(*

 * This unit defines the behavior and the appearance of visual gears.

 *

 * Visual gears are "things"/"objects" in the game that do not need to be

 * perfectly synchronized over all clients since their effect is only

 * of visual nature.

 *

 * E.g.: background flakes, visual effects: explosion, smoke trails, etc.

 *)

interface

procedure initModule;

procedure freeModule;

function  AddVisualGear(X, Y: LongInt; Kind: TVisualGearType; State: LongWord = 0; Critical: Boolean = false): PVisualGear;

procedure ProcessVisualGears(Steps: Longword);

procedure KickFlakes(Radius, X, Y: LongInt);

procedure DrawVisualGears(Layer: LongWord);

procedure DeleteVisualGear(Gear: PVisualGear);

function  VisualGearByUID(uid : Longword) : PVisualGear;

procedure AddClouds;

procedure ChangeToSDClouds;

procedure AddFlakes;

procedure ChangeToSDFlakes;

procedure AddDamageTag(X, Y, Damage, Color: LongWord);

implementation

uses uSound, uMobile, uVariables, uTextures, uRender, Math, uRenderUtils, uStore;

const cExplFrameTicks = 110;

// For better maintainability the step handlers of visual gears are stored

// in a separate file.

{$INCLUDE "VGSHandlers.inc"}

procedure AddDamageTag(X, Y, Damage, Color: LongWord);

var s: shortstring;

    Gear: PVisualGear;

begin

if cAltDamage then

    begin

    Gear:= AddVisualGear(X, Y, vgtSmallDamageTag);

    if Gear <> nil then

        with Gear^ do

            begin

            str(Damage, s);

            Tex:= RenderStringTex(s, Color, fntSmall);

            end

    end

end;

// ==================================================================

// ==================================================================

const doStepHandlers: array[TVisualGearType] of TVGearStepProcedure =

        (

            @doStepFlake,

            @doStepCloud,

            @doStepExpl,

            @doStepExpl,

            @doStepFire,

            @doStepSmallDamage,

            @doStepTeamHealthSorter,

            @doStepSpeechBubble,

            @doStepBubble,

            @doStepSteam,

            @doStepAmmo,

            @doStepSmoke,

            @doStepSmoke,

            @doStepShell,

            @doStepDust,

            @doStepSplash,

            @doStepDroplet,

            @doStepSmokeRing,

            @doStepBeeTrace,

            @doStepEgg,

            @doStepFeather,

            @doStepHealthTag,

            @doStepSmokeTrace,

            @doStepSmokeTrace,

            @doStepExplosion,

            @doStepBigExplosion,

            @doStepChunk,

            @doStepNote,

            @doStepLineTrail,

            @doStepBulletHit,

            @doStepCircle,

            @doStepSmoothWindBar,

            @doStepStraightShot

        );

function  AddVisualGear(X, Y: LongInt; Kind: TVisualGearType; State: LongWord = 0; Critical: Boolean = false): PVisualGear;

const VGCounter: Longword = 0;

var gear: PVisualGear;

    t: Longword;

    sp: real;

begin

AddVisualGear:= nil;

if ((GameType = gmtSave) or (fastUntilLag and (GameType = gmtNet))) and // we are scrolling now

   ((Kind <> vgtCloud) and not Critical) then exit;

if ((cReducedQuality and rqAntiBoom) <> 0) and

   not Critical and

   not (Kind in

   [vgtTeamHealthSorter,

    vgtSmallDamageTag,

    vgtSpeechBubble,

    vgtHealthTag,

    vgtExplosion,

    vgtSmokeTrace,

    vgtEvilTrace,

    vgtNote,

    vgtSmoothWindBar]) then exit;

inc(VGCounter);

New(gear);

FillChar(gear^, sizeof(TVisualGear), 0);

gear^.X:= real(X);

gear^.Y:= real(Y);

gear^.Kind := Kind;

gear^.doStep:= doStepHandlers[Kind];

gear^.State:= 0;

gear^.Tint:= $FFFFFFFF;

gear^.uid:= VGCounter;

with gear^ do

    case Kind of

    vgtFlake: begin

                Timer:= 0;

                tdX:= 0;

                tdY:= 0;

                if SuddenDeathDmg then

                    begin

                    FrameTicks:= random(vobSDFrameTicks);

                    Frame:= random(vobSDFramesCount);

                    end

                else

                    begin

                    FrameTicks:= random(vobFrameTicks);

                    Frame:= random(vobFramesCount);

                    end;

                Angle:= random * 360;

                dx:= 0.0000038654705 * random(10000);

                dy:= 0.000003506096 * random(7000);

                if random(2) = 0 then dx := -dx;

                if SuddenDeathDmg then dAngle:= (random(2) * 2 - 1) * (1 + random) * vobSDVelocity / 1000

                else dAngle:= (random(2) * 2 - 1) * (1 + random) * vobVelocity / 1000

                end;

    vgtCloud: begin

                Frame:= random(4);

                dx:= 0.5 + 0.1 * random(5); // how much the cloud will be affected by wind

                timer:= random(4096);

                end;

    vgtExplPart,

    vgtExplPart2: begin

                t:= random(1024);

                sp:= 0.001 * (random(95) + 70);

                dx:= hwFloat2Float(AngleSin(t)) * sp;

                dy:= hwFloat2Float(AngleCos(t)) * sp;

                if random(2) = 0 then dx := -dx;

                if random(2) = 0 then dy := -dy;

                Frame:= 7 - random(3);

                FrameTicks:= cExplFrameTicks

                end;

        vgtFire: begin

                t:= random(1024);

                sp:= 0.001 * (random(85) + 95);

                dx:= hwFloat2Float(AngleSin(t)) * sp;

                dy:= hwFloat2Float(AngleCos(t)) * sp;

                if random(2) = 0 then dx := -dx;

                if random(2) = 0 then dy := -dy;

                FrameTicks:= 650 + random(250);

                Frame:= random(8)

                end;

         vgtEgg: begin

                t:= random(1024);

                sp:= 0.001 * (random(85) + 95);

                dx:= hwFloat2Float(AngleSin(t)) * sp;

                dy:= hwFloat2Float(AngleCos(t)) * sp;

                if random(2) = 0 then dx := -dx;

                if random(2) = 0 then dy := -dy;

                FrameTicks:= 650 + random(250);

                Frame:= 1

                end;

        vgtShell: FrameTicks:= 500;

    vgtSmallDamageTag: begin

                gear^.FrameTicks:= 1100

                end;

    vgtBubble: begin

                dx:= 0.0000038654705 * random(10000);

                dy:= 0;

                if random(2) = 0 then dx := -dx;

                FrameTicks:= 250 + random(1751);

                Frame:= random(5)

                end;

    vgtSteam: begin

                dx:= 0.0000038654705 * random(10000);

                dy:= 0.001 * (random(85) + 95);

                if random(2) = 0 then dx := -dx;

                Frame:= 7 - random(3);

                FrameTicks:= cExplFrameTicks * 2;

                end;

    vgtAmmo: begin

                alpha:= 1.0;

                scale:= 1.0

                end;

  vgtSmokeWhite,

  vgtSmoke: begin

                Scale:= 1.0;

                dx:= 0.0002 * (random(45) + 10);

                dy:= 0.0002 * (random(45) + 10);

                if random(2) = 0 then dx := -dx;

                Frame:= 7 - random(2);

                FrameTicks:= cExplFrameTicks * 2;

                end;

  vgtDust: begin

                dx:= 0.005 * (random(15) + 10);

                dy:= 0.001 * (random(40) + 20);

                if random(2) = 0 then dx := -dx;

                Frame:= 7 - random(2);

                FrameTicks:= random(20) + 15;

                end;

  vgtSplash: begin

                dx:= 0;

                dy:= 0;

                FrameTicks:= 740;

                Frame:= 19;

                end;

    vgtDroplet: begin

                dx:= 0.001 * (random(75) + 15);

                dy:= -0.001 * (random(80) + 120);

                if random(2) = 0 then dx := -dx;

                FrameTicks:= 250 + random(1751);

                Frame:= random(3)

                end;

   vgtBeeTrace: begin

                FrameTicks:= 1000;

                Frame:= random(16);

                end;

    vgtSmokeRing: begin

                dx:= 0;

                dy:= 0;

                FrameTicks:= 600;

                Timer:= 0;

                Frame:= 0;

                scale:= 0.6;

                alpha:= 1;

                angle:= random(360);

                end;

     vgtFeather: begin

                t:= random(1024);

                sp:= 0.001 * (random(85) + 95);

                dx:= hwFloat2Float(AngleSin(t)) * sp;

                dy:= hwFloat2Float(AngleCos(t)) * sp;

                if random(2) = 0 then dx := -dx;

                if random(2) = 0 then dy := -dy;

                FrameTicks:= 650 + random(250);

                Frame:= 1

                end;

  vgtHealthTag: begin

                Frame:= 0;

                Timer:= 1500;

                dY:= -0.08;

                dX:= 0;

                //gear^.Z:= 2002;

                end;

  vgtSmokeTrace,

  vgtEvilTrace: begin

                gear^.X:= gear^.X - 16;

                gear^.Y:= gear^.Y - 16;

                gear^.State:= 8;

                //gear^.Z:= cSmokeZ

                end;

vgtBigExplosion: begin

                gear^.Angle:= random(360);

                end;

      vgtChunk: begin

                gear^.Frame:= random(4);

                t:= random(1024);

                sp:= 0.001 * (random(85) + 47);

                dx:= hwFloat2Float(AngleSin(t)) * sp;

                dy:= hwFloat2Float(AngleCos(t)) * sp * -2;

                if random(2) = 0 then dx := -dx;

                end;

      vgtNote: begin

                dx:= 0.005 * (random(15) + 10);

                dy:= -0.001 * (random(40) + 20);

                if random(2) = 0 then dx := -dx;

                Frame:= random(4);

                FrameTicks:= random(2000) + 1500;

                end;

  vgtBulletHit: begin

                dx:= 0;

                dy:= 0;

                FrameTicks:= 350;

                Frame:= 7;

                Angle:= 0;

                end;

vgtSmoothWindBar: Tag:= hwRound(cWindSpeed * 72 / cMaxWindSpeed);

 vgtStraightShot: begin

                Scale:= 1.0;

                dx:= 0.001 * random(45);

                dy:= 0.001 * (random(20) + 25);

                State:= ord(sprHealth);

                if random(2) = 0 then dx := -dx;

                Frame:= 0;

                FrameTicks:= random(750) + 1250;

                State:= ord(sprSnowDust);

                end;

        end;

if State <> 0 then gear^.State:= State;

case Gear^.Kind of

    // 0: this layer is very distant in the background when stereo

    vgtTeamHealthSorter,

    vgtSmoothWindBar,

    vgtFlake, 

    vgtCloud: begin

              if VisualGearsLayer0 <> nil then

                  begin

                  VisualGearsLayer0^.PrevGear:= gear;

                  gear^.NextGear:= VisualGearsLayer0

                  end;

              gear^.Layer:= 0;

              VisualGearsLayer0:= gear

              end; 

    // 1: this layer is on the land level (which is close but behind the screen plane) when stereo

    vgtSmokeTrace,

    vgtEvilTrace,

    vgtLineTrail,

    vgtSmoke,

    vgtSmokeWhite,

    vgtDust,

    vgtFire,

    vgtSplash,

    vgtDroplet,

    vgtBubble: begin

              if VisualGearsLayer1 <> nil then

                  begin

                  VisualGearsLayer1^.PrevGear:= gear;

                  gear^.NextGear:= VisualGearsLayer1

                  end;

              gear^.Layer:= 1;

              VisualGearsLayer1:= gear

              end; 

    // 3: this layer is on the screen plane (depth = 0) when stereo

    vgtSpeechBubble,

    vgtSmallDamageTag,

    vgtHealthTag,

    vgtStraightShot,

    vgtChunk: begin

              if VisualGearsLayer3 <> nil then

                  begin

                  VisualGearsLayer3^.PrevGear:= gear;

                  gear^.NextGear:= VisualGearsLayer3

                  end;

              gear^.Layer:= 3;

              VisualGearsLayer3:= gear

              end; 

    // 2: this layer is outside the screen when stereo

    vgtExplosion,

    vgtBigExplosion,

    vgtExplPart,

    vgtExplPart2,

    vgtSteam,

    vgtAmmo,

    vgtShell,

    vgtFeather,

    vgtEgg,

    vgtBeeTrace,

    vgtSmokeRing,

    vgtNote,

    vgtBulletHit,

    vgtCircle: begin

              if VisualGearsLayer2 <> nil then

                  begin

                  VisualGearsLayer2^.PrevGear:= gear;

                  gear^.NextGear:= VisualGearsLayer2

                  end;

              gear^.Layer:= 2;

              VisualGearsLayer2:= gear

              end; 

end;

AddVisualGear:= gear;

end;

procedure DeleteVisualGear(Gear: PVisualGear);

begin

    if Gear^.Tex <> nil then

        FreeTexture(Gear^.Tex);

    Gear^.Tex:= nil;

    if Gear^.NextGear <> nil then Gear^.NextGear^.PrevGear:= Gear^.PrevGear;

    if Gear^.PrevGear <> nil then Gear^.PrevGear^.NextGear:= Gear^.NextGear

    else

        case Gear^.Layer of

            0: VisualGearsLayer0:= Gear^.NextGear;

            1: VisualGearsLayer1:= Gear^.NextGear;

            2: VisualGearsLayer2:= Gear^.NextGear;

            3: VisualGearsLayer3:= Gear^.NextGear;

        end;

    if lastVisualGearByUID = Gear then lastVisualGearByUID:= nil;

    Dispose(Gear);

end;

procedure ProcessVisualGears(Steps: Longword);

var Gear, t: PVisualGear;

begin

if Steps = 0 then exit;

t:= VisualGearsLayer0;

while t <> nil do

      begin

      Gear:= t;

      t:= Gear^.NextGear;

      Gear^.doStep(Gear, Steps)

      end;

t:= VisualGearsLayer1;

while t <> nil do

      begin

      Gear:= t;

      t:= Gear^.NextGear;

      Gear^.doStep(Gear, Steps)

      end;

t:= VisualGearsLayer2;

while t <> nil do

      begin

      Gear:= t;

      t:= Gear^.NextGear;

      Gear^.doStep(Gear, Steps)

      end;

t:= VisualGearsLayer3;

while t <> nil do

      begin

      Gear:= t;

      t:= Gear^.NextGear;

      Gear^.doStep(Gear, Steps)

      end

end;

procedure KickFlakes(Radius, X, Y: LongInt);

var Gear, t: PVisualGear;

    dmg: LongInt;

begin

if (vobCount = 0) or (vobCount > 200) then exit;

t:= VisualGearsLayer0;

while t <> nil do

      begin

      Gear:= t;

      if Gear^.Kind = vgtFlake then

          begin

          // Damage calc from doMakeExplosion

          dmg:= Min(101, Radius + cHHRadius div 2 - LongInt(abs(round(Gear^.X) - X) + abs(round(Gear^.Y) - Y)) div 5);

          if dmg > 1 then

              begin

              Gear^.tdX:= 0.02 * dmg + 0.01;

              if Gear^.X - X < 0 then Gear^.tdX := -Gear^.tdX;

              Gear^.tdY:= 0.02 * dmg + 0.01;

              if Gear^.Y - Y < 0 then Gear^.tdY := -Gear^.tdY;