(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2012 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 uLandGraphics;

interface

uses uFloat, uConsts, uTypes;

type

    fillType = (nullPixel, backgroundPixel, ebcPixel, icePixel, setNotCurrentMask, changePixelSetNotCurrent, setCurrentHog, changePixelNotSetNotCurrent);

type TRangeArray = array[0..31] of record

                                   Left, Right: LongInt;

                                   end;

     PRangeArray = ^TRangeArray;

TLandCircleProcedure = procedure (landX, landY, pixelX, pixelY: Longint);

function  addBgColor(OldColor, NewColor: LongWord): LongWord;

function  SweepDirty: boolean;

function  Despeckle(X, Y: LongInt): Boolean;

procedure Smooth(X, Y: LongInt);

function  CheckLandValue(X, Y: LongInt; LandFlag: Word): boolean;

function  DrawExplosion(X, Y, Radius: LongInt): Longword;

procedure DrawHLinesExplosions(ar: PRangeArray; Radius: LongInt; y, dY: LongInt; Count: Byte);

procedure DrawTunnel(X, Y, dX, dY: hwFloat; ticks, HalfWidth: LongInt);

procedure FillRoundInLand(X, Y, Radius: LongInt; Value: Longword);

function FillRoundInLand(X, Y, Radius: LongInt; fill: fillType): LongWord;

procedure ChangeRoundInLand(X, Y, Radius: LongInt; doSet, isCurrent: boolean);

function  LandBackPixel(x, y: LongInt): LongWord;

procedure DrawLine(X1, Y1, X2, Y2: LongInt; Color: Longword);

procedure DrawThickLine(X1, Y1, X2, Y2, radius: LongInt; color: Longword);

procedure DumpLandToLog(x, y, r: LongInt);

procedure DrawIceBreak(x, y, iceRadius, iceHeight: Longint);

function TryPlaceOnLand(cpX, cpY: LongInt; Obj: TSprite; Frame: LongInt; doPlace: boolean; indestructible: boolean): boolean;

implementation

uses SDLh, uLandTexture, uVariables, uUtils, uDebug;

procedure calculatePixelsCoordinates(landX, landY: Longint; var pixelX, pixelY: Longint); inline;

begin

if (cReducedQuality and rqBlurryLand) = 0 then

    begin

    pixelX := landX;

    pixelY := landY;

    end

else

    begin

    pixelX := LandX div 2;

    pixelY := LandY div 2;

    end;

end;

function drawPixelBG(landX, landY, pixelX, pixelY: Longint): Longword; inline;

begin

drawPixelBG := 0;

if (Land[LandY, landX] and lfIndestructible) = 0 then

    begin

        if ((Land[landY, landX] and lfBasic) <> 0) and (((LandPixels[pixelY, pixelX] and AMask) shr AShift) = 255) and (not disableLandBack) then

        begin

            LandPixels[pixelY, pixelX]:= LandBackPixel(landX, landY);

            inc(drawPixelBG);

        end

        else if ((Land[landY, landX] and lfObject) <> 0) or (((LandPixels[pixelY, pixelX] and AMask) shr AShift) < 255) then

            LandPixels[pixelY, pixelX]:= 0

    end;

end;

procedure drawPixelEBC(landX, landY, pixelX, pixelY: Longint); inline;

begin

if ((Land[landY, landX] and lfBasic) <> 0) or ((Land[landY, landX] and lfObject) <> 0) then

    begin

    LandPixels[pixelY, pixelX]:= ExplosionBorderColor;

    Land[landY, landX]:= (Land[landY, landX] or lfDamaged) and not lfIce;

    LandDirty[landY div 32, landX div 32]:= 1;                        

    end;

end;

function isLandscapeEdge(weight:Longint):boolean; inline;

begin

result := (weight < 8) and (weight >= 2);

end;

function getPixelWeight(x, y:Longint): Longint;

var

    i, j:Longint;

begin

result := 0;

for i := x - 1 to x + 1 do

    for j := y - 1 to y + 1 do

    begin

    if (i < 0) or

       (i > LAND_WIDTH - 1) or

       (j < 0) or

       (j > LAND_HEIGHT -1) then

       begin               

       result := 9;

       exit;

       end;

    if Land[j, i] and lfLandMask and not lfIce = 0 then

       result := result + 1;

    end;

end;

procedure fillPixelFromIceSprite(pixelX, pixelY:Longint); inline;

var

    iceSurface: PSDL_Surface;

    icePixels: PLongwordArray;

    w: LongWord;

begin

    // So. 3 parameters here. Ice colour, Ice opacity, and a bias on the greyscaled pixel towards lightness

    iceSurface:= SpritesData[sprIceTexture].Surface;

    icePixels := iceSurface^.pixels;

    w:= LandPixels[pixelY, pixelX];

    if w > 0 then

        begin

        w:= round(((w shr RShift and $FF) * RGB_LUMINANCE_RED +

              (w shr BShift and $FF) * RGB_LUMINANCE_GREEN +

              (w shr GShift and $FF) * RGB_LUMINANCE_BLUE));

        if w < 128 then w:= w+128;

        if w > 255 then w:= 255;

        w:= (w shl RShift) or (w shl BShift) or (w shl GShift) or (LandPixels[pixelY, pixelX] and AMask);

        LandPixels[pixelY, pixelX]:= addBgColor(w, IceColor);

        LandPixels[pixelY, pixelX]:= addBgColor(LandPixels[pixelY, pixelX], icePixels^[iceSurface^.w * (pixelY mod iceSurface^.h) + (pixelX mod iceSurface^.w)])

        end

    else 

        begin

        LandPixels[pixelY, pixelX]:= IceColor and not AMask or $E8 shl AShift;

        LandPixels[pixelY, pixelX]:= addBgColor(LandPixels[pixelY, pixelX], icePixels^[iceSurface^.w * (pixelY mod iceSurface^.h) + (pixelX mod iceSurface^.w)]);

        // silly workaround to avoid having to make background erasure a tadb it smarter about sea ice

        if LandPixels[pixelY, pixelX] and AMask shr AShift = 255 then 

            LandPixels[pixelY, pixelX]:= LandPixels[pixelY, pixelX] and not AMask or 254 shl AShift;

        end;

end;

procedure DrawPixelIce(landX, landY, pixelX, pixelY: Longint); inline;

begin

if ((Land[landY, landX] and lfIce) <> 0) then exit;

if isLandscapeEdge(getPixelWeight(landX, landY)) then

    begin

    if (LandPixels[pixelY, pixelX] and AMask < 255) and (LandPixels[pixelY, pixelX] and AMask > 0) then

        LandPixels[pixelY, pixelX] := (IceEdgeColor and not AMask) or (LandPixels[pixelY, pixelX] and AMask)

    else if (LandPixels[pixelY, pixelX] and AMask < 255) or (Land[landY, landX] > 255) then

        LandPixels[pixelY, pixelX] := IceEdgeColor

    end

else if Land[landY, landX] > 255 then

    begin

        fillPixelFromIceSprite(pixelX, pixelY);

    end;

if Land[landY, landX] > 255 then Land[landY, landX] := Land[landY, landX] or lfIce and not lfDamaged;

end;

function FillLandCircleLine(y, fromPix, toPix: LongInt; fill : fillType): Longword;

var px, py, i: LongInt;

begin

//get rid of compiler warning

    px := 0;

    py := 0;

    FillLandCircleLine := 0;

    case fill of

    backgroundPixel: 

    for i:= fromPix to toPix do

        begin

        calculatePixelsCoordinates(i, y, px, py);

        inc(FillLandCircleLine, drawPixelBG(i, y, px, py));

        end;

    ebcPixel: 

    for i:= fromPix to toPix do

        begin

        calculatePixelsCoordinates(i, y, px, py);

        drawPixelEBC(i, y, px, py);

        end;

    nullPixel: 

    for i:= fromPix to toPix do

        begin

        calculatePixelsCoordinates(i, y, px, py);

        if ((Land[y, i] and lfIndestructible) = 0) and (not disableLandBack or (Land[y, i] > 255))  then

            LandPixels[py, px]:= 0        

        end;

    icePixel: 

    for i:= fromPix to toPix do

        begin

        calculatePixelsCoordinates(i, y, px, py);

        DrawPixelIce(i, y, px, py);

        end;

    setNotCurrentMask: 

    for i:= fromPix to toPix do

        begin

        Land[y, i]:= Land[y, i] and lfNotCurrentMask;

        end;

    changePixelSetNotCurrent: 

    for i:= fromPix to toPix do

        begin

        if Land[y, i] and lfObjMask > 0 then

            Land[y, i]:= (Land[y, i] and lfNotObjMask) or ((Land[y, i] and lfObjMask) - 1);

        end;

    setCurrentHog: 

    for i:= fromPix to toPix do

        begin

        Land[y, i]:= Land[y, i] or lfCurrentHog

        end;

    changePixelNotSetNotCurrent:

    for i:= fromPix to toPix do

        begin

        if Land[y, i] and lfObjMask < lfObjMask then

            Land[y, i]:= (Land[y, i] and lfNotObjMask) or ((Land[y, i] and lfObjMask) + 1)     

        end;

    end;    

end;

function FillLandCircleSegment(x, y, dx, dy: LongInt; fill : fillType): Longword; inline;

begin

    FillLandCircleSegment := 0;

if ((y + dy) and LAND_HEIGHT_MASK) = 0 then

    inc(FillLandCircleSegment, FillLandCircleLine(y + dy, Max(x - dx, 0), Min(x + dx, LAND_WIDTH - 1), fill));

if ((y - dy) and LAND_HEIGHT_MASK) = 0 then

    inc(FillLandCircleSegment, FillLandCircleLine(y - dy, Max(x - dx, 0), Min(x + dx, LAND_WIDTH - 1), fill));

if ((y + dx) and LAND_HEIGHT_MASK) = 0 then

    inc(FillLandCircleSegment, FillLandCircleLine(y + dx, Max(x - dy, 0), Min(x + dy, LAND_WIDTH - 1), fill));

if ((y - dx) and LAND_HEIGHT_MASK) = 0 then

    inc(FillLandCircleSegment, FillLandCircleLine(y - dx, Max(x - dy, 0), Min(x + dy, LAND_WIDTH - 1), fill));

end;

function FillRoundInLand(X, Y, Radius: LongInt; fill: fillType): Longword; inline;

var dx, dy, d: LongInt;

begin

dx:= 0;

dy:= Radius;

d:= 3 - 2 * Radius;

FillRoundInLand := 0;

while (dx < dy) do

    begin

    inc(FillRoundInLand, FillLandCircleSegment(x, y, dx, dy, fill));

    if (d < 0) then

        d:= d + 4 * dx + 6

    else

        begin

        d:= d + 4 * (dx - dy) + 10;

        dec(dy)

        end;

    inc(dx)

    end;

if (dx = dy) then

    inc (FillRoundInLand, FillLandCircleSegment(x, y, dx, dy, fill));

end;

function addBgColor(OldColor, NewColor: LongWord): LongWord;

// Factor ranges from 0 to 100% NewColor

var

    oRed, oBlue, oGreen, oAlpha, nRed, nBlue, nGreen, nAlpha: byte;

begin

    oAlpha := (OldColor shr AShift);

    nAlpha := (NewColor shr AShift);

    // shortcircuit

    if (oAlpha = 0) or (nAlpha = $FF) then

        begin

        addBgColor:= NewColor;

        exit

        end;

    // Get colors

    oRed   := (OldColor shr RShift);

    oGreen := (OldColor shr GShift);

    oBlue  := (OldColor shr BShift);

    nRed   := (NewColor shr RShift);

    nGreen := (NewColor shr GShift);

    nBlue  := (NewColor shr BShift);

    // Mix colors

    nRed   := min(255,((nRed*nAlpha) div 255) + ((oRed*oAlpha*byte(255-nAlpha)) div 65025));

    nGreen := min(255,((nGreen*nAlpha) div 255) + ((oGreen*oAlpha*byte(255-nAlpha)) div 65025));

    nBlue  := min(255,((nBlue*nAlpha) div 255) + ((oBlue*oAlpha*byte(255-nAlpha)) div 65025));

    nAlpha := min(255, oAlpha + nAlpha);

    addBgColor := (nAlpha shl AShift) or (nRed shl RShift) or (nGreen shl GShift) or (nBlue shl BShift);

end;

procedure FillCircleLines(x, y, dx, dy: LongInt; Value: Longword);

var i: LongInt;

begin

if ((y + dy) and LAND_HEIGHT_MASK) = 0 then

    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do

        if (Land[y + dy, i] and lfIndestructible) = 0 then

            Land[y + dy, i]:= Value;

if ((y - dy) and LAND_HEIGHT_MASK) = 0 then

    for i:= Max(x - dx, 0) to Min(x + dx, LAND_WIDTH - 1) do

        if (Land[y - dy, i] and lfIndestructible) = 0 then

            Land[y - dy, i]:= Value;

if ((y + dx) and LAND_HEIGHT_MASK) = 0 then

    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do

        if (Land[y + dx, i] and lfIndestructible) = 0 then

            Land[y + dx, i]:= Value;

if ((y - dx) and LAND_HEIGHT_MASK) = 0 then

    for i:= Max(x - dy, 0) to Min(x + dy, LAND_WIDTH - 1) do

        if (Land[y - dx, i] and lfIndestructible) = 0 then

            Land[y - dx, i]:= Value;

end;

procedure FillRoundInLand(X, Y, Radius: LongInt; Value: Longword);

var dx, dy, d: LongInt;

begin

dx:= 0;

dy:= Radius;

d:= 3 - 2 * Radius;

while (dx < dy) do

    begin

    FillCircleLines(x, y, dx, dy, Value);

    if (d < 0) then

        d:= d + 4 * dx + 6

    else

        begin

        d:= d + 4 * (dx - dy) + 10;

        dec(dy)

        end;

    inc(dx)

    end;

if (dx = dy) then

    FillCircleLines(x, y, dx, dy, Value);

end;

procedure ChangeRoundInLand(X, Y, Radius: LongInt; doSet, isCurrent: boolean);

begin

if not doSet and isCurrent then

    FillRoundInLand(X, Y, Radius, setNotCurrentMask)

else if not doSet and not IsCurrent then

    FillRoundInLand(X, Y, Radius, changePixelSetNotCurrent)

else if doSet and IsCurrent then

    FillRoundInLand(X, Y, Radius, setCurrentHog)

else if doSet and not IsCurrent then

    FillRoundInLand(X, Y, Radius, changePixelNotSetNotCurrent);

end;

procedure DrawIceBreak(x, y, iceRadius, iceHeight: Longint);

var

    i, j: integer;

    landRect: TSDL_Rect;

begin

for i := min(max(x - iceRadius, 0), LAND_WIDTH - 1) to min(max(x + iceRadius, 0), LAND_WIDTH - 1) do

    begin

    for j := min(max(y, 0), LAND_HEIGHT - 1) to min(max(y + iceHeight, 0), LAND_HEIGHT - 1) do

        begin

        if Land[j, i] = 0 then

            begin

            Land[j, i] := lfIce;                

            fillPixelFromIceSprite(i, j);

            end;

        end;        

    end;

landRect.x := min(max(x - iceRadius, 0), LAND_WIDTH - 1);

landRect.y := min(max(y, 0), LAND_HEIGHT - 1);

landRect.w := min(2*iceRadius, LAND_WIDTH - landRect.x - 1);

landRect.h := min(iceHeight, LAND_HEIGHT - landRect.y - 1);

UpdateLandTexture(landRect.x, landRect.w, landRect.y, landRect.h, true);        

end;

function DrawExplosion(X, Y, Radius: LongInt): Longword;

var

    tx, ty, dx, dy: Longint;

begin    

    DrawExplosion := FillRoundInLand(x, y, Radius, backgroundPixel);

    if Radius > 20 then

        FillRoundInLand(x, y, Radius - 15, nullPixel);

    FillRoundInLand(X, Y, Radius, 0);

    FillRoundInLand(x, y, Radius + 4, ebcPixel);

    tx:= Max(X - Radius - 1, 0);

    dx:= Min(X + Radius + 1, LAND_WIDTH) - tx;

    ty:= Max(Y - Radius - 1, 0);

    dy:= Min(Y + Radius + 1, LAND_HEIGHT) - ty;

    UpdateLandTexture(tx, dx, ty, dy, false);

end;

procedure DrawHLinesExplosions(ar: PRangeArray; Radius: LongInt; y, dY: LongInt; Count: Byte);

var tx, ty, by, bx,  i: LongInt;

begin

for i:= 0 to Pred(Count) do

    begin

    for ty:= Max(y - Radius, 0) to Min(y + Radius, LAND_HEIGHT) do

        for tx:= Max(0, ar^[i].Left - Radius) to Min(LAND_WIDTH, ar^[i].Right + Radius) do

            begin

            if (Land[ty, tx] and lfIndestructible) = 0 then

                begin

                if (cReducedQuality and rqBlurryLand) = 0 then

                    begin

                    by:= ty; bx:= tx;

                    end

                else

                    begin

                    by:= ty div 2; bx:= tx div 2;

                    end;

                if ((Land[ty, tx] and lfBasic) <> 0) and (((LandPixels[by,bx] and AMask) shr AShift) = 255) and (not disableLandBack) then

                    LandPixels[by, bx]:= LandBackPixel(tx, ty)

                else if ((Land[ty, tx] and lfObject) <> 0) or (((LandPixels[by,bx] and AMask) shr AShift) < 255) then

                    LandPixels[by, bx]:= 0

                end

            end;

    inc(y, dY)

    end;

inc(Radius, 4);

dec(y, Count * dY);

for i:= 0 to Pred(Count) do

    begin

    for ty:= Max(y - Radius, 0) to Min(y + Radius, LAND_HEIGHT) do

        for tx:= Max(0, ar^[i].Left - Radius) to Min(LAND_WIDTH, ar^[i].Right + Radius) do

            if ((Land[ty, tx] and lfBasic) <> 0) or ((Land[ty, tx] and lfObject) <> 0) then

                begin

                 if (cReducedQuality and rqBlurryLand) = 0 then

                    LandPixels[ty, tx]:= ExplosionBorderColor

                else

                    LandPixels[ty div 2, tx div 2]:= ExplosionBorderColor;

                Land[ty, tx]:= (Land[ty, tx] or lfDamaged) and not lfIce;

                LandDirty[ty div 32, tx div 32]:= 1;

                end;

    inc(y, dY)

    end;

UpdateLandTexture(0, LAND_WIDTH, 0, LAND_HEIGHT, false)

end;

procedure DrawExplosionBorder(X, Y, dx, dy:hwFloat;  despeckle : Boolean);

var

    t, tx, ty :Longint;

begin

for t:= 0 to 7 do

    begin

    X:= X + dX;

    Y:= Y + dY;

    tx:= hwRound(X);

    ty:= hwRound(Y);

    if ((ty and LAND_HEIGHT_MASK) = 0) and ((tx and LAND_WIDTH_MASK) = 0) and (((Land[ty, tx] and lfBasic) <> 0)

    or ((Land[ty, tx] and lfObject) <> 0)) then

        begin

        Land[ty, tx]:= (Land[ty, tx] or lfDamaged) and not lfIce;

        if despeckle then

            LandDirty[ty div 32, tx div 32]:= 1;

        if (cReducedQuality and rqBlurryLand) = 0 then

            LandPixels[ty, tx]:= ExplosionBorderColor

        else

            LandPixels[ty div 2, tx div 2]:= ExplosionBorderColor

        end

    end;        

end;

//

//  - (dX, dY) - direction, vector of length = 0.5

//

procedure DrawTunnel(X, Y, dX, dY: hwFloat; ticks, HalfWidth: LongInt);

var nx, ny, dX8, dY8: hwFloat;

    i, t, tx, ty, by, bx, stX, stY, ddy, ddx: Longint;

    despeckle : Boolean;

begin  // (-dY, dX) is (dX, dY) rotated by PI/2

stY:= hwRound(Y);

stX:= hwRound(X);

despeckle:= HalfWidth > 1;

nx:= X + dY * (HalfWidth + 8);

ny:= Y - dX * (HalfWidth + 8);

dX8:= dX * 8;

dY8:= dY * 8;