(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2005-2008 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

 *)

unit uLandGraphics;

interface

uses uFloat, uConsts;

{$INCLUDE options.inc}

type PRangeArray = ^TRangeArray;

     TRangeArray = array[0..31] of record

                                   Left, Right: LongInt;

                                   end;

function SweepDirty: boolean;

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

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

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);

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

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

implementation

uses SDLh, uMisc, uLand, uLandTexture;

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] <> COLOR_INDESTRUCTIBLE 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] <> COLOR_INDESTRUCTIBLE 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] <> COLOR_INDESTRUCTIBLE 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] <> COLOR_INDESTRUCTIBLE then

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

end;

procedure ChangeCircleLines(x, y, dx, dy: LongInt; doSet: boolean);

var i: LongInt;

begin

if not doSet then

   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] > 0) and (Land[y + dy, i] < 256) then dec(Land[y + dy, i]); // check > 0 because explosion can erase collision data

   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] > 0) and (Land[y - dy, i] < 256) then dec(Land[y - dy, i]);

   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] > 0) and (Land[y + dx, i] < 256) then dec(Land[y + dx, i]);

   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] > 0) and (Land[y - dx, i] < 256) then dec(Land[y - dx, i]);

   end else

   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] < 256) then

              inc(Land[y + dy, i]);

   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] < 256) then

              inc(Land[y - dy, i]);

   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] < 256) then

              inc(Land[y + dx, i]);

   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] < 256) then

              inc(Land[y - dx, i]);

   end

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: boolean);

var dx, dy, d: LongInt;

begin

  dx:= 0;

  dy:= Radius;

  d:= 3 - 2 * Radius;

  while (dx < dy) do

     begin

     ChangeCircleLines(x, y, dx, dy, doSet);

     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 ChangeCircleLines(x, y, dx, dy, doSet)

end;

procedure FillLandCircleLines0(x, y, dx, dy: LongInt);

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] = COLOR_LAND then

            LandPixels[y + dy, i]:= 0;

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] = COLOR_LAND then

             LandPixels[y - dy, i]:= 0;

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] = COLOR_LAND then

            LandPixels[y + dx, i]:= 0;

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] = COLOR_LAND then

             LandPixels[y - dx, i]:= 0;

end;

procedure FillLandCircleLinesEBC(x, y, dx, dy: LongInt);

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] = COLOR_LAND then 

          begin

          LandPixels[y + dy, i]:= cExplosionBorderColor;

//          Despeckle(y + dy, i);

          LandDirty[(y + dy) div 32, i div 32]:= 1;

          end;

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] = COLOR_LAND then

          begin

          LandPixels[y - dy, i]:= cExplosionBorderColor;

//          Despeckle(y - dy, i);

          LandDirty[(y - dy) div 32, i div 32]:= 1;

          end;

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] = COLOR_LAND then

           begin

           LandPixels[y + dx, i]:= cExplosionBorderColor;

//           Despeckle(y + dx, i);

           LandDirty[(y + dx) div 32, i div 32]:= 1;

           end;

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] = COLOR_LAND then

          begin

          LandPixels[y - dx, i]:= cExplosionBorderColor;

//          Despeckle(y - dx, i);

          LandDirty[(y - dx) div 32, i div 32]:= 1;

          end;

end;

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

var dx, dy, ty, tx, d: LongInt;

begin

  dx:= 0;

  dy:= Radius;

  d:= 3 - 2 * Radius;

  while (dx < dy) do

     begin

     FillLandCircleLines0(x, y, dx, dy);

     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 FillLandCircleLines0(x, y, dx, dy);

  // FillRoundInLand after erasing land pixels to allow Land 0 check for mask.png to function

  FillRoundInLand(X, Y, Radius, 0);

  inc(Radius, 4);

  dx:= 0;

  dy:= Radius;

  d:= 3 - 2 * Radius;

  while (dx < dy) do

     begin

     FillLandCircleLinesEBC(x, y, dx, dy);

     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 FillLandCircleLinesEBC(x, y, dx, dy);

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)

end;

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

var tx, ty, 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

            if Land[ty, tx] = COLOR_LAND then

                LandPixels[ty, tx]:= 0;

    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] = COLOR_LAND then

                begin

                LandPixels[ty, tx]:= cExplosionBorderColor;

                LandDirty[trunc((y + dy)/32), trunc(i/32)]:= 1;

                end;

    inc(y, dY)

    end;

UpdateLandTexture(0, LAND_WIDTH, 0, LAND_HEIGHT)

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, stX, stY, ddy, ddx: Longint;

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

stY:= hwRound(Y);

stX:= hwRound(X);

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

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

dX8:= dX * 8;

dY8:= dY * 8;

for i:= 0 to 7 do

    begin

    X:= nx - dX8;

    Y:= ny - dY8;

    for t:= -8 to ticks + 8 do

        {$include tunsetborder.inc}

    nx:= nx - dY;

    ny:= ny + dX;

    end;

for i:= -HalfWidth to HalfWidth do

    begin

    X:= nx - dX8;

    Y:= ny - dY8;

    for t:= 0 to 7 do

        {$include tunsetborder.inc}

    X:= nx;

    Y:= ny;

    for t:= 0 to ticks 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) then

         if Land[ty, tx] = COLOR_LAND then

           begin

           Land[ty, tx]:= 0;

           LandPixels[ty, tx]:= 0;

           end

        end;

    for t:= 0 to 7 do

        {$include tunsetborder.inc}

    nx:= nx - dY;

    ny:= ny + dX;

    end;

for i:= 0 to 7 do

    begin

    X:= nx - dX8;

    Y:= ny - dY8;

    for t:= -8 to ticks + 8 do

        {$include tunsetborder.inc}

    nx:= nx - dY;

    ny:= ny + dX;

    end;

tx:= max(stX - HalfWidth * 2 - 4 - abs(hwRound(dX * ticks)), 0);

ty:= max(stY - HalfWidth * 2 - 4 - abs(hwRound(dY * ticks)), 0);

ddx:= min(stX + HalfWidth * 2 + 4 + abs(hwRound(dX * ticks)), LAND_WIDTH) - tx;

ddy:= min(stY + HalfWidth * 2 + 4 + abs(hwRound(dY * ticks)), LAND_HEIGHT) - ty;

UpdateLandTexture(tx, ddx, ty, ddy)

end;

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

var X, Y, bpp, h, w, row, col, numFramesFirstCol: LongInt;

    p: PByteArray;

    Image: PSDL_Surface;

begin

numFramesFirstCol:= SpritesData[Obj].imageHeight div SpritesData[Obj].Height;

TryDo(SpritesData[Obj].Surface <> nil, 'Assert SpritesData[Obj].Surface failed', true);

Image:= SpritesData[Obj].Surface;

w:= SpritesData[Obj].Width;

h:= SpritesData[Obj].Height;

row:= Frame mod numFramesFirstCol;

col:= Frame div numFramesFirstCol;

if SDL_MustLock(Image) then

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

bpp:= Image^.format^.BytesPerPixel;

TryDo(bpp = 4, 'It should be 32 bpp sprite', true);

// Check that sprite fits free space

p:= @(PByteArray(Image^.pixels)^[ Image^.pitch * row * h + col * w * 4 ]);

case bpp of

     4: for y:= 0 to Pred(h) do

            begin

            for x:= 0 to Pred(w) do

                if PLongword(@(p^[x * 4]))^ <> 0 then

                   if ((cpY + y) < Longint(topY)) or

                      ((cpY + y) > LAND_HEIGHT) or

                      ((cpX + x) < Longint(leftX)) or

                      ((cpX + x) > Longint(rightX)) or

                      (Land[cpY + y, cpX + x] <> 0) then

                      begin

                      if SDL_MustLock(Image) then

                         SDL_UnlockSurface(Image);

                      exit(false)

                      end;

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

            end;

     end;

TryPlaceOnLand:= true;

if not doPlace then

   begin

   if SDL_MustLock(Image) then

      SDL_UnlockSurface(Image);

   exit

   end;

// Checked, now place

p:= @(PByteArray(Image^.pixels)^[ Image^.pitch * row * h + col * w * 4 ]);

case bpp of

     4: for y:= 0 to Pred(h) do

            begin

            for x:= 0 to Pred(w) do

                if PLongword(@(p^[x * 4]))^ <> 0 then

                   begin

                   Land[cpY + y, cpX + x]:= COLOR_LAND;

                   LandPixels[cpY + y, cpX + x]:= PLongword(@(p^[x * 4]))^

                   end;

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

            end;

     end;

if SDL_MustLock(Image) then

   SDL_UnlockSurface(Image);

x:= max(cpX, leftX);

w:= min(cpX + Image^.w, LAND_WIDTH) - x;

y:= max(cpY, topY);

h:= min(cpY + Image^.h, LAND_HEIGHT) - y;

UpdateLandTexture(x, w, y, h)

end;

// was experimenting with applying as damage occurred.

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

var nx, ny, i, j, c: LongInt;

begin

if (Land[Y, X] <> 0) and (Land[Y, X] <> COLOR_INDESTRUCTIBLE) and (LandPixels[Y, X] = cExplosionBorderColor)then // check neighbours

	begin

	c:= 0;

	for i:= -1 to 1 do

		for j:= -1 to 1 do

			if (i <> 0) or (j <> 0) then

				begin

				ny:= Y + i;

				nx:= X + j;

				if ((ny and LAND_HEIGHT_MASK) = 0) and ((nx and LAND_WIDTH_MASK) = 0) then

					if Land[ny, nx] > 255 then

						inc(c);

				end;

	if c < 4 then // 0-3 neighbours

		begin

		LandPixels[Y, X]:= 0;

		Land[Y, X]:= 0;

		exit(true);

		end;

	end;

Despeckle:= false

end;

function SweepDirty: boolean;

var x, y, xx, yy: LongInt;

    Result, updateBlock, resweep: boolean;

begin

Result:= false;

for y:= 0 to LAND_HEIGHT div 32 - 1 do

	begin

	for x:= 0 to LAND_WIDTH div 32 - 1 do

		begin

		if LandDirty[y, x] <> 0 then

			begin

			updateBlock:= false;

            resweep:= true;

            while(resweep) do

                begin

                resweep:= false;

                for yy:= y * 32 to y * 32 + 31 do

                    for xx:= x * 32 to x * 32 + 31 do

                        if Despeckle(xx, yy) then

                            begin

                            Result:= true;

                            updateBlock:= true;

                            resweep:= true;

                            end;

                end;

			if updateBlock then UpdateLandTexture(x * 32, 32, y * 32, 32);

			LandDirty[y, x]:= 0;

			end;

		end;

	end;

SweepDirty:= Result

end;