(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *)

{$INCLUDE "options.inc"}

unit uLandTexture;

interface

uses SDLh;

procedure initModule;

procedure freeModule;

procedure UpdateLandTexture(X, Width, Y, Height: LongInt; landAdded: boolean);

procedure DrawLand(dX, dY: LongInt);

procedure ResetLand;

procedure SetLandTexture;

implementation

const TEXSIZE = 128;

      // in avoid tile borders stretch the blurry texture by 1 pixel more

      BLURRYLANDOVERLAP: real = 1 / TEXSIZE / 2.0; // 1 pixel divided by texsize and blurry land scale factor

type TLandRecord = record

            shouldUpdate, landAdded: boolean;

            tex: PTexture;

            end;

var LandTextures: array of array of TLandRecord;

    tmpPixels: array [0..TEXSIZE - 1, 0..TEXSIZE - 1] of LongWord;

    LANDTEXARW: LongWord;

    LANDTEXARH: LongWord;

function Pixels(x, y: Longword): Pointer;

var ty: Longword;

begin

for ty:= 0 to TEXSIZE - 1 do

    Move(LandPixels[y * TEXSIZE + ty, x * TEXSIZE], tmpPixels[ty, 0], sizeof(Longword) * TEXSIZE);

Pixels:= @tmpPixels

end;

function Pixels2(x, y: Longword): Pointer;

var tx, ty: Longword;

begin

for ty:= 0 to TEXSIZE - 1 do

    for tx:= 0 to TEXSIZE - 1 do

Pixels2:= @tmpPixels

end;

procedure UpdateLandTexture(X, Width, Y, Height: LongInt; landAdded: boolean);

var tx, ty: Longword;

    tSize : LongInt;

begin

    if cOnlyStats then exit;

    if (Width <= 0) or (Height <= 0) then

        exit;

    checkFails((X >= 0) and (X < LAND_WIDTH), 'UpdateLandTexture: wrong X parameter', true);

    checkFails(X + Width <= LAND_WIDTH, 'UpdateLandTexture: wrong Width parameter', true);

    checkFails((Y >= 0) and (Y < LAND_HEIGHT), 'UpdateLandTexture: wrong Y parameter', true);

    checkFails(Y + Height <= LAND_HEIGHT, 'UpdateLandTexture: wrong Height parameter', true);

    if not allOK then exit;

    tSize:= TEXSIZE;

    // land textures have half the size/resolution in blurry mode

    if (cReducedQuality and rqBlurryLand) <> 0 then

        tSize:= tSize * 2;

    for ty:= Y div tSize to (Y + Height - 1) div tSize do

        for tx:= X div tSize to (X + Width - 1) div tSize do

            begin

            if not LandTextures[tx, ty].shouldUpdate then

                begin

                LandTextures[tx, ty].shouldUpdate:= true;

                inc(dirtyLandTexCount);

                end;

            LandTextures[tx, ty].landAdded:= landAdded

            end;

end;

procedure RealLandTexUpdate(x1, x2, y1, y2: LongInt);

var x, y, ty, tx, lx, ly : LongWord;

    isEmpty: boolean;

begin

    if cOnlyStats then exit;

(*

if LandTextures[0, 0].tex = nil then

    for x:= 0 to LANDTEXARW -1 do

        for y:= 0 to LANDTEXARH - 1 do

            with LandTextures[x, y] do

                begin

                tex:= NewTexture(TEXSIZE, TEXSIZE, Pixels(x, y));

                glBindTexture(GL_TEXTURE_2D, tex^.id);

                glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, tpHigh);

                end

else

*)

    for x:= x1 to x2 do

        for y:= y1 to y2 do

            with LandTextures[x, y] do

                if shouldUpdate then

                    begin

                    shouldUpdate:= false;

                    dec(dirtyLandTexCount);

                    isEmpty:= not landAdded;

                    landAdded:= false;

                    ty:= 0;

                    tx:= 1;

                    ly:= y * TEXSIZE;

                    lx:= x * TEXSIZE;

                    // first check edges

                    while isEmpty and (ty < TEXSIZE) do

                        begin

                        isEmpty:= LandPixels[ly + ty, lx] and AMask = 0;

                        if isEmpty then isEmpty:= LandPixels[ly + ty, Pred(lx + TEXSIZE)] and AMask = 0;

                        inc(ty)

                        end;

                    while isEmpty and (tx < TEXSIZE-1) do

                        begin

                        isEmpty:= LandPixels[ly, lx + tx] and AMask = 0;

                        if isEmpty then isEmpty:= LandPixels[Pred(ly + TEXSIZE), lx + tx] and AMask = 0;

                        inc(tx)

                        end;

                    // then search every other remaining. does this sort of stuff defeat compiler opts?

                    ty:= 2;

                    while isEmpty and (ty < TEXSIZE-1) do

                        begin

                        tx:= 2;

                        while isEmpty and (tx < TEXSIZE-1) do

                            begin

                            isEmpty:= LandPixels[ly + ty, lx + tx] and AMask = 0;

                            inc(tx,2)

                            end;

                        inc(ty,2);

                        end;

                    // and repeat

                    ty:= 1;

                    while isEmpty and (ty < TEXSIZE-1) do

                        begin

                        tx:= 1;

                        while isEmpty and (tx < TEXSIZE-1) do

                            begin

                            isEmpty:= LandPixels[ly + ty, lx + tx] and AMask = 0;

                            inc(tx,2)

                            end;

                        inc(ty,2);

                        end;

                    if not isEmpty then

                        begin

                        if tex = nil then tex:= NewTexture(TEXSIZE, TEXSIZE, Pixels(x, y));

                        glBindTexture(GL_TEXTURE_2D, tex^.id);

                        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TEXSIZE, TEXSIZE, 0, GL_RGBA, GL_UNSIGNED_BYTE, Pixels(x,y));

                        end

                    else if tex <> nil then

                        FreeAndNilTexture(tex);

                    // nothing else to do

                    if dirtyLandTexCount < 1 then

                        exit;

                    end

end;

procedure DrawLand(dX, dY: LongInt);

var x, y, tX, ty, tSize, fx, lx, fy, ly: LongInt;

    tScale: GLfloat;

    overlap: boolean;

begin

// init values based on quality settings

if (cReducedQuality and rqBlurryLand) <> 0 then

    begin

    tSize:= TEXSIZE * 2;

    tScale:= 2.0;

    overlap:= (cReducedQuality and rqClampLess) <> 0;

    end

else

    begin

    tSize:= TEXSIZE;

    tScale:= 1.0;

    overlap:= false;

    end;

// figure out visible area

// first column

tx:= ViewLeftX - dx;

fx:= tx div tSize;

if tx < 0 then dec(fx);

fx:= max(0, fx);

// last column

tx:= ViewRightX - dx;

lx:= tx div tSize;

if tx < 0 then dec(lx);

lx:= min(LANDTEXARW -1, lx);

// all offscreen

if (fx > lx) then

    exit;

// first row

ty:= ViewTopY - dy;

fy:= ty div tSize;

if ty < 0 then dec(fy);

fy:= max(0, fy);

// last row

ty:= ViewBottomY - dy;

ly:= ty div tSize;

if ty < 0 then dec(ly);

ly:= min(LANDTEXARH -1, ly);

// all offscreen

if (fy > ly) then

    exit;

// update visible areas of landtex before drawing

if dirtyLandTexCount > 0 then

    RealLandTexUpdate(fx, lx, fy, ly);

tX:= dX + tsize * fx;

// loop through columns

for x:= fx to lx do

    begin

    // loop through textures in this column

    for y:= fy to ly do

        with LandTextures[x, y] do

            if tex <> nil then

                begin

                ty:= dY + y * tSize;

                if overlap then

                    DrawTexture2(tX, ty, tex, tScale, BLURRYLANDOVERLAP)

                else

                    DrawTexture(tX, ty, tex, tScale);

                end;

    // increment tX

    inc(tX, tSize);

    end;

end;

procedure SetLandTexture;

begin

    if (cReducedQuality and rqBlurryLand) = 0 then

        begin

        LANDTEXARW:= LAND_WIDTH div TEXSIZE;

        LANDTEXARH:= LAND_HEIGHT div TEXSIZE;

        end

    else

        begin

        LANDTEXARW:= (LAND_WIDTH div TEXSIZE) div 2;

        LANDTEXARH:= (LAND_HEIGHT div TEXSIZE) div 2;

        end;

    SetLength(LandTextures, LANDTEXARW, LANDTEXARH);

end;

procedure initModule;

begin

end;

procedure ResetLand;

var x, y: LongInt;

begin

    for x:= 0 to LANDTEXARW - 1 do

        for y:= 0 to LANDTEXARH - 1 do

            with LandTextures[x, y] do

                FreeAndNilTexture(tex);

end;

procedure freeModule;

begin

    ResetLand;

    if LandBackSurface <> nil then

        SDL_FreeSurface(LandBackSurface);

    LandBackSurface:= nil;

    SetLength(LandTextures, 0, 0);

end;

end.