unit fTerrain;

interface

uses
  Winapi.OpenGL,
  Winapi.Windows,
  System.SysUtils,
  System.Classes,
  System.Math,
  Vcl.ExtCtrls,
  Vcl.StdCtrls,
  Vcl.Graphics,
  Vcl.Controls,
  Vcl.Forms,
  Vcl.Dialogs,
  Vcl.Imaging.GIFImg,
  Vcl.Imaging.Jpeg,

  
  GLS.Scene,
  GLS.VectorTypes,
  GLS.Objects,
  GLS.TerrainRenderer,
  GLS.HeightData,
  GLS.Color,
  GLS.Cadencer,
  GLS.Texture,
  GLS.BitmapFont,
  GLS.Keyboard,
  GLS.SkyDome,
  GLS.SceneViewer,
  GLS.Sound,
  Sounds.BASS,
  GLS.VectorGeometry,
  GLS.LensFlare,
  GLS.Material,
  GLS.Coordinates,
  GLS.BaseClasses,
  GLS.State,
  GLS.FileMP3,
  GLS.Utils,
 
  GLS.HUDObjects;

type
  TFormTerrain = class(TForm)
    GLSceneViewer1: TGLSceneViewer;
    GLBitmapHDS1: TGLBitmapHDS;
    GLScene1: TGLScene;
    GLCamera1: TGLCamera;
    DummyCube1: TGLDummyCube;
    TerrainRenderer1: TGLTerrainRenderer;
    Timer1: TTimer;
    GLCadencer1: TGLCadencer;
    GLMaterialLibrary1: TGLMaterialLibrary;
    BitmapFont1: TGLBitmapFont;
    HUDText1: TGLHUDText;
    SkyDome1: TGLSkyDome;
    SPMoon: TGLSprite;
    SPSun: TGLSprite;
    DCSound: TGLDummyCube;
    GLSMBASS1: TGLSMBASS;
    TISound: TTimer;
    GLSoundLibrary: TGLSoundLibrary;
    GLLensFlare: TGLLensFlare;
    GLDummyCube1: TGLDummyCube;
    InitialRenderPoint: TGLRenderPoint;
    procedure GLSceneViewer1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure GLSceneViewer1MouseMove(Sender: TObject; Shift: TShiftState;
      X, Y: Integer);
    procedure Timer1Timer(Sender: TObject);
    procedure GLCadencer1Progress(Sender: TObject;
      const deltaTime, newTime: Double);
    procedure FormCreate(Sender: TObject);
    procedure FormKeyPress(Sender: TObject; var Key: Char);
    procedure TISoundTimer(Sender: TObject);
    procedure FormMouseWheel(Sender: TObject; Shift: TShiftState;
      WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
  public
    mx, my: Integer;
    fullScreen: Boolean;
    FCamHeight: Single;
  end;

var
  FormTerrain: TFormTerrain;

implementation

{$R *.DFM}

procedure TFormTerrain.FormCreate(Sender: TObject);
begin
  SetGLSceneMediaDir();
  // 8 MB height data cache
  // Note this is the data size in terms of elevation samples, it does not
  // take into account all the data required/allocated by the renderer
  GLBitmapHDS1.MaxPoolSize := 8 * 1024 * 1024;
  // specify height map data
  GLBitmapHDS1.Picture.LoadFromFile('terrain.bmp');
  // load the texture maps
  GLMaterialLibrary1.Materials[0].Material.Texture.Image.LoadFromFile('snow512.jpg');
  GLMaterialLibrary1.Materials[1].Material.Texture.Image.LoadFromFile('detailmap.jpg');
  SPMoon.Material.Texture.Image.LoadFromFile('moon.bmp');
  SPSun.Material.Texture.Image.LoadFromFile('flare1.bmp');
  // apply texture map scale (our heightmap size is 256)
  TerrainRenderer1.TilesPerTexture := 256 / TerrainRenderer1.TileSize;
  // load Bitmap Font
  BitmapFont1.Glyphs.LoadFromFile('darkgold_font.bmp');
  // load and setup sound samples
  with GLSoundLibrary.Samples do
  begin
    Add.LoadFromFile('ChillyWind.mp3');
    Add.LoadFromFile('howl.mp3');
  end;
  // Could've been done at design time, but then it hurts the eyes ;)
  GLSceneViewer1.Buffer.BackgroundColor := clWhite;
  // Move camera starting point to an interesting hand-picked location
  DummyCube1.Position.X := 570;
  DummyCube1.Position.Z := -385;
  DummyCube1.Turn(90);
  // Initial camera height offset (controled with pageUp/pageDown)
  FCamHeight := 10;
end;

procedure TFormTerrain.GLCadencer1Progress(Sender: TObject;
  const deltaTime, newTime: Double);
var
  speed: Single;
begin
  // handle keypresses
  if IsKeyDown(VK_SHIFT) then
    speed := 5 * deltaTime
  else
    speed := deltaTime;
  with GLCamera1.Position do
  begin
    if IsKeyDown(VK_UP) then
      DummyCube1.Translate(Z * speed, 0, -X * speed);
    if IsKeyDown(VK_DOWN) then
      DummyCube1.Translate(-Z * speed, 0, X * speed);
    if IsKeyDown(VK_LEFT) then
      DummyCube1.Translate(-X * speed, 0, -Z * speed);
    if IsKeyDown(VK_RIGHT) then
      DummyCube1.Translate(X * speed, 0, Z * speed);
    if IsKeyDown(VK_PRIOR) then
      FCamHeight := FCamHeight + 10 * speed;
    if IsKeyDown(VK_NEXT) then
      FCamHeight := FCamHeight - 10 * speed;
    if IsKeyDown(VK_ESCAPE) then
      Close;
  end;
  // don't drop through terrain!
  with DummyCube1.Position do
    Y := TerrainRenderer1.InterpolatedHeight(AsVector) + FCamHeight;
end;

// Standard mouse rotation & FPS code below

procedure TFormTerrain.GLSceneViewer1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  mx := X;
  my := Y;
end;

procedure TFormTerrain.GLSceneViewer1MouseMove(Sender: TObject; Shift: TShiftState;
  X, Y: Integer);
begin
  if ssLeft in Shift then
  begin
    GLCamera1.MoveAroundTarget((my - Y) * 0.5, (mx - X) * 0.5);
    mx := X;
    my := Y;
  end;
end;

procedure TFormTerrain.Timer1Timer(Sender: TObject);
begin
  HUDText1.Text := Format('%.1f FPS - %d', [GLSceneViewer1.FramesPerSecond,
    TerrainRenderer1.LastTriangleCount]);
  GLSceneViewer1.ResetPerformanceMonitor;
end;

procedure TFormTerrain.FormKeyPress(Sender: TObject; var Key: Char);
var
  Color: TGIFColor;

begin
  case Key of
    'w', 'W':
      with GLMaterialLibrary1.Materials[0].Material do
      begin
        if PolygonMode = pmLines then
          PolygonMode := pmFill
        else
          PolygonMode := pmLines;
      end;
    '+':
      if GLCamera1.DepthOfView < 2000 then
      begin
        GLCamera1.DepthOfView := GLCamera1.DepthOfView * 1.2;
        with GLSceneViewer1.Buffer.FogEnvironment do
        begin
          FogEnd := FogEnd * 1.2;
          FogStart := FogStart * 1.2;
        end;
      end;
    '-':
      if GLCamera1.DepthOfView > 300 then
      begin
        GLCamera1.DepthOfView := GLCamera1.DepthOfView / 1.2;
        with GLSceneViewer1.Buffer.FogEnvironment do
        begin
          FogEnd := FogEnd / 1.2;
          FogStart := FogStart / 1.2;
        end;
      end;
    '*':
      with TerrainRenderer1 do
        if CLODPrecision > 20 then
          CLODPrecision := Round(CLODPrecision * 0.8);
    '/':
      with TerrainRenderer1 do
        if CLODPrecision < 1000 then
          CLODPrecision := Round(CLODPrecision * 1.2);
    '8':
      with TerrainRenderer1 do
        if QualityDistance > 40 then
          QualityDistance := Round(QualityDistance * 0.8);
    '9':
      with TerrainRenderer1 do
        if QualityDistance < 1000 then
          QualityDistance := Round(QualityDistance * 1.2);
    'n', 'N':
      with SkyDome1 do
        if Stars.Count = 0 then
        begin
          // turn on 'night' mode
          Color.Red := 0;
          Color.Green := 0;
          Color.Blue := 8;
          Bands[0].StopColor.AsWinColor := TGIFColorMap.RGB2Color(Color);
          Color.Red := 0;
          Color.Green := 0;
          Color.Blue := 0;
          Bands[0].StartColor.AsWinColor := TGIFColorMap.RGB2Color(Color);
          Color.Red := 0;
          Color.Green := 0;
          Color.Blue := 16;
          Bands[1].StopColor.AsWinColor := TGIFColorMap.RGB2Color(Color);
          Color.Red := 0;
          Color.Green := 0;
          Color.Blue := 8;
          Bands[1].StartColor.AsWinColor := TGIFColorMap.RGB2Color(Color);
          with Stars do
          begin
            AddRandomStars(700, clWhite, True); // many white stars
            Color.Red := 255;
            Color.Green := 100;
            Color.Blue := 100;
            AddRandomStars(100, TGIFColorMap.RGB2Color(Color), True);
            // some redish ones
            Color.Red := 100;
            Color.Green := 100;
            Color.Blue := 255;
            AddRandomStars(100, TGIFColorMap.RGB2Color(Color), True);
            // some blueish ones
            Color.Red := 255;
            Color.Green := 255;
            Color.Blue := 100;
            AddRandomStars(100, TGIFColorMap.RGB2Color(Color), True);
            // some yellowish ones
          end;
          GLSceneViewer1.Buffer.BackgroundColor := clBlack;
          with GLSceneViewer1.Buffer.FogEnvironment do
          begin
            FogColor.AsWinColor := clBlack;
            FogStart := -FogStart; // Fog is used to make things darker
          end;
          SPMoon.Visible := True;
          SPSun.Visible := False;
          GLLensFlare.Visible := False;
        end;
    'd', 'D':
      with SkyDome1 do
        if Stars.Count > 0 then
        begin
          // turn on 'day' mode
          Bands[1].StopColor.Color := clrNavy;
          Bands[1].StartColor.Color := clrBlue;
          Bands[0].StopColor.Color := clrBlue;
          Bands[0].StartColor.Color := clrWhite;
          Stars.Clear;
          GLSceneViewer1.Buffer.BackgroundColor := clWhite;
          with GLSceneViewer1.Buffer.FogEnvironment do
          begin
            FogColor.AsWinColor := clWhite;
            FogStart := -FogStart;
          end;
          GLSceneViewer1.Buffer.FogEnvironment.FogStart := 0;
          SPMoon.Visible := False;
          SPSun.Visible := True;
        end;
    't':
      with SkyDome1 do
      begin
        if sdoTwinkle in Options then
          Options := Options - [sdoTwinkle]
        else
          Options := Options + [sdoTwinkle];
      end;
    'l':
      with GLLensFlare do
        Visible := (not Visible) and SPSun.Visible;
  end;
  Key := #0;
end;

procedure TFormTerrain.FormMouseWheel(Sender: TObject; Shift: TShiftState;
  WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
begin
   GLCamera1.AdjustDistanceToTarget(Power(1.03, WheelDelta/120));
end;

procedure TFormTerrain.TISoundTimer(Sender: TObject);
var
  wolfPos: TGLVector;
  c, s: Single;
begin
  if not GLSMBASS1.Active then
    Exit;
  if SkyDome1.Stars.Count = 0 then
  begin
    // wind blows around camera
    with GetOrCreateSoundEmitter(GLCamera1) do
    begin
      Source.SoundLibrary := GLSoundLibrary;
      Source.SoundName := GLSoundLibrary.Samples[0].Name;
      Source.Volume := Random * 0.5 + 0.5;
      Playing := True;
    end;
  end
  else
  begin
    // wolf howl at some distance, at ground level
    wolfPos := GLCamera1.AbsolutePosition;
    SinCosine(Random * c2PI, 100 + Random(1000), s, c);
    wolfPos.X := wolfPos.X + c;
    wolfPos.Z := wolfPos.Z + s;
    wolfPos.Y := TerrainRenderer1.InterpolatedHeight(wolfPos);
    DCSound.Position.AsVector := wolfPos;
    with GetOrCreateSoundEmitter(DCSound) do
    begin
      Source.SoundLibrary := GLSoundLibrary;
      Source.SoundName := GLSoundLibrary.Samples[1].Name;
      Source.MinDistance := 100;
      Source.MaxDistance := 4000;
      Playing := True;
    end;
  end;
  TISound.Enabled := False;
  TISound.Interval := 10000 + Random(10000);
  TISound.Enabled := True;
end;

// Test Code for InterpolatedHeight, use as a Button1's click event
{
  procedure TForm1.Button1Click(Sender: TObject);
  var
  x, y : Integer;
  sph : TGLSphere;
  begin
  for x:=-5 to 5 do begin
  for y:=-5 to 5 do begin
  sph:=TGLSphere(GLScene1.Objects.AddNewChild(TGLSphere));
  sph.Position.X:=DummyCube1.Position.X+X*2;
  sph.Position.Z:=DummyCube1.Position.Z+Y*2;
  sph.Position.Y:=TerrainRenderer1.InterpolatedHeight(sph.Position.AsVector);
  sph.Radius:=0.5;
  end;
  end;
  end; }

end.