unit uLandUtils;

interface

uses SDLh;

procedure ResizeLand(width, height: LongWord);

procedure DisposeLand();

procedure InitWorldEdges();

function  LandGet(y, x: LongInt): Word;

procedure LandSet(y, x: LongInt; value: Word);

function  LandRow(row: LongInt): PWordArray;

procedure FillLand(x, y: LongInt; border, value: Word);

function  LandPixelGet(y, x: LongInt): Longword;

procedure LandPixelSet(y, x: LongInt; value: Longword);

function  LandPixelRow(row: LongInt): PLongwordArray;

implementation

uses uUtils, uConsts, uVariables, uTypes;

const LibFutureName = 'hwengine_future';

function  create_empty_game_field(width, height: Longword): pointer; cdecl; external LibFutureName;

procedure dispose_game_field(game_field: pointer); cdecl; external LibFutureName;

function  land_get(game_field: pointer; x, y: LongInt): Word; cdecl; external LibFutureName;

procedure land_set(game_field: pointer; x, y: LongInt; value: Word); cdecl; external LibFutureName;

function  land_row(game_field: pointer; row: LongInt): PWordArray; cdecl; external LibFutureName;

procedure land_fill(game_field: pointer; x, y: LongInt; border, fill: Word); cdecl; external LibFutureName;

function  land_pixel_get(game_field: pointer; x, y: LongInt): Longword; cdecl; external LibFutureName;

procedure land_pixel_set(game_field: pointer; x, y: LongInt; value: Longword); cdecl; external LibFutureName;

function  land_pixel_row(game_field: pointer; row: LongInt): PLongwordArray; cdecl; external LibFutureName;

var gameField: pointer;

function  LandGet(y, x: LongInt): Word;

begin

    LandGet:= land_get(gameField, x, y)

end;

procedure LandSet(y, x: LongInt; value: Word);

begin

    land_set(gameField, x, y, value)

end;

function  LandRow(row: LongInt): PWordArray;

begin

    LandRow:= land_row(gameField, row)

end;

procedure FillLand(x, y: LongInt; border, value: Word);

begin

    land_fill(gameField, x, y, border, value)

end;

function  LandPixelGet(y, x: LongInt): Longword;

begin

    LandPixelGet:= land_pixel_get(gameField, x, y)

end;

procedure LandPixelSet(y, x: LongInt; value: Longword);

begin

    land_pixel_set(gameField, x, y, value)

end;

function  LandPixelRow(row: LongInt): PLongwordArray;

begin

    LandPixelRow:= land_pixel_row(gameField, row)

end;

begin

    seed[byte(seed[0]) + 1]:= #0;

    // let's assume those are powers of two

    LAND_WIDTH_MASK:= not(LAND_WIDTH-1);

    LAND_HEIGHT_MASK:= not(LAND_HEIGHT-1);

    SetLength(LandDirty, (LAND_HEIGHT div 32), (LAND_WIDTH div 32));

    initScreenSpaceVars();

end;

procedure ResizeLand(width, height: LongWord);

var potW, potH: LongInt;

begin

potW:= toPowerOf2(width);

potH:= toPowerOf2(height);

if (potW <> LAND_WIDTH) or (potH <> LAND_HEIGHT) then

    begin

    LAND_WIDTH:= potW;

    LAND_HEIGHT:= potH;

    LAND_WIDTH_MASK:= not(LAND_WIDTH-1);

    LAND_HEIGHT_MASK:= not(LAND_HEIGHT-1);

    cWaterLine:= LAND_HEIGHT;

    gameField:= create_empty_game_field(LAND_WIDTH, LAND_HEIGHT);

    SetLength(LandDirty, (LAND_HEIGHT div 32), (LAND_WIDTH div 32));

    // 0.5 is already approaching on unplayable

    if (width div 4096 >= 2) or (height div 2048 >= 2) then cMaxZoomLevel:= cMaxZoomLevel/2;

    cMinMaxZoomLevelDelta:= cMaxZoomLevel - cMinZoomLevel

    end;

initScreenSpaceVars();

end;

procedure DisposeLand();

begin

    dispose_game_field(gameField)

end;

procedure InitWorldEdges();

var cy, cx, lx, ly: LongInt;

    found: boolean;

begin

playHeight:= LAND_HEIGHT;

topY:= 0;

lx:= LongInt(LAND_WIDTH) - 1;

// don't change world edges for drawn maps

if (cMapGen = mgDrawn) then

    // edges were adjusted already in GenDrawnMap() in uLand

    EXIT;

// use maximum available map width if there is no special world edge

if WorldEdge = weNone then

    begin

    playWidth:= LAND_WIDTH;

    leftX := 0;

    rightX:= lx;

    EXIT;

    end;

// keep fort distance consistent if we're in wrap mode on fort map

if (cMapGen = mgForts) and (WorldEdge = weWrap) then

    begin

    // edges were adjusted already in MakeFortsMap() in uLand

    EXIT;

    end;

ly:= LongInt(LAND_HEIGHT) - 1;

// find most left land pixels and set leftX accordingly

found:= false;

for cx:= 0 to lx do

    begin

    for cy:= ly downto 0 do

        if LandGet(cy, cx) <> 0 then

            begin

            leftX:= max(0, cx - cWorldEdgeDist);

            // break out of both loops

            found:= true;

            break;

            end;

    if found then break;

    end;

// find most right land pixels and set rightX accordingly

found:= false;

for cx:= lx downto 0 do

    begin

    for cy:= ly downto 0 do

        if LandGet(cy, cx) <> 0 then

            begin

            rightX:= min(lx, cx + cWorldEdgeDist);

            // break out of both loops

            found:= true;

            break;

            end;

    if found then break;

    end;

playWidth := rightX + 1 - leftX;

end;

end.