unit fCloudSkyD;

interface

uses
  Winapi.Windows,
  Winapi.Messages,
  System.SysUtils,
  System.Variants,
  System.Classes,
  System.Math,
  Vcl.Graphics,
  Vcl.Controls,
  Vcl.Forms,
  Vcl.Dialogs,
  Vcl.StdCtrls,
  Vcl.ExtCtrls,

  GLS.Scene,
  GLS.Objects,
  GLS.SceneViewer,
  GLS.AsyncTimer,
  GLS.Cadencer,
  GLScene.VectorGeometry,
  GLS.SkyDome,
  GLS.Texture,
  GLS.FileTGA,
  GLS.Keyboard,
  GLS.Material,
  GLS.Coordinates,
  GLS.BaseClasses,
  GLScene.Utils,
  GLS.SimpleNavigation,

  GLS.CgShader;

type

  TMainForm = class(TForm)
    GLScene: TGLScene;
    GLSV: TGLSceneViewer;
    dc_cam: TGLDummyCube;
    cam: TGLCamera;
    Cadencer: TGLCadencer;
    Timer: TGLAsyncTimer;
    SbBackground: TGLSkyBox;
    MatLib: TGLMaterialLibrary;
    CgBackground: TCgShader;
    CgClouds: TCgShader;
    SbClouds: TGLSkyBox;
    Moons: TGLDummyCube;
    sprSecunda: TGLSprite;
    sprMasser: TGLSprite;
    CgMasser: TCgShader;
    CgSecunda: TCgShader;
    CgSun: TCgShader;
    sprSun: TGLSprite;
    Panel1: TPanel;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    GLSimpleNavigation1: TGLSimpleNavigation;
    PanelFPS: TPanel;
    procedure CgCloudsApplyVP(CgProgram: TCgProgram; Sender: TObject);
    procedure CgSunUnApplyFP(CgProgram: TCgProgram);
    procedure CgSunApplyFP(CgProgram: TCgProgram; Sender: TObject);
    procedure CgSecundaUnApplyFP(CgProgram: TCgProgram);
    procedure CgSecundaApplyFP(CgProgram: TCgProgram; Sender: TObject);
    procedure CgMasserUnApplyFP(CgProgram: TCgProgram);
    procedure CgMasserApplyFP(CgProgram: TCgProgram; Sender: TObject);
    procedure CgCloudsUnApplyFP(CgProgram: TCgProgram);
    procedure CgCloudsApplyFP(CgProgram: TCgProgram; Sender: TObject);
    procedure CgBackgroundUnApplyFP(CgProgram: TCgProgram);
    procedure CgBackgroundApplyFP(CgProgram: TCgProgram; Sender: TObject);
    procedure CadencerProgress(Sender: TObject;
      const deltaTime, newTime: Double);
    procedure FormCreate(Sender: TObject);
    procedure GLSVMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure GLSVMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
    procedure FormMouseWheel(Sender: TObject; Shift: TShiftState;
      WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
    procedure TimerTimer(Sender: TObject);
  private
    mx, my: Integer;
    bg_w1, bg_w2, c_w1, c_w2, m_w, a_w: single;
    DayMode, WeatherMode: byte;
    procedure HandleKeys;
    procedure AssignMaterials;
    procedure CreateMaterials;
  public
  end;

var
  MainForm: TMainForm;
  dirSelf, dirTextures, dirShaders: TFileName;

const
  Coeff = 0.1;

// ---------------------------------------------------------
implementation

{$R *.dfm}

// ---------------------------FormCreate--------------------
procedure TMainForm.FormCreate(Sender: TObject);
begin
  // GetDir(0, dirSelf);
  dirSelf := GetCurrentAssetPath();  // current assets
  dirTextures := dirSelf + '\texture\';
  dirShaders := dirSelf + '\shader\';

  CreateMaterials;
  AssignMaterials;
  bg_w1 := 1;
  bg_w2 := 0;
  c_w1 := 1;
  c_w2 := 0;
  m_w := 0; // moons
  a_w := 0; // ambient

  WeatherMode := 0;
  ClientWidth := 1024;
  ClientHeight := 712;
  Position := poScreenCenter;
  GLSV.Align := alClient;
  Timer.Enabled := True;
end;

// ---------------------------CreateMaterials---------------
procedure TMainForm.CreateMaterials;
begin
  CgBackground.FragmentProgram.LoadFromFile
    (dirShaders + 'fragment_bkground.cg');
  CgClouds.FragmentProgram.LoadFromFile(dirShaders + 'fragment_clouds.cg');
  CgMasser.FragmentProgram.LoadFromFile(dirShaders + 'fragment_moon.cg');
  CgSecunda.FragmentProgram.LoadFromFile(dirShaders + 'fragment_moon.cg');
  CgSun.FragmentProgram.LoadFromFile(dirShaders + 'fragment_moon.cg');

  // day background
  MatLib.AddTextureMaterial('day', dirTextures + 'tx_day.tga');

  // night background
  MatLib.AddTextureMaterial('night', dirTextures + 'tx_night.tga');

  // main skybox material
  with MatLib.Materials.Add do
  begin
    Name := 'background';
    Shader := CgBackground;
  end;

  // clouds
  MatLib.AddTextureMaterial('clouds_clear', dirTextures + 'tx_sky_clear.tga');
  MatLib.AddTextureMaterial('clouds_cloudy', dirTextures + 'tx_sky_cloudy.tga');

  // main clouds material
  with MatLib.Materials.Add do
  begin
    Name := 'clouds';
    Material.BlendingMode := bmTransparency;
    Shader := CgClouds;
  end;

  // moons
  MatLib.AddTextureMaterial('masser', dirTextures + 'tx_masser_three_wan.tga');
  MatLib.AddTextureMaterial('secunda',
    dirTextures + 'tx_secunda_three_wan.tga');
  MatLib.AddTextureMaterial('sun', dirTextures + 'tx_sun.tga');

  with MatLib.Materials.Add do
  begin
    Name := 'moon_masser';
    Material.BlendingMode := bmTransparency;
    Shader := CgMasser;
  end;

  with MatLib.Materials.Add do
  begin
    Name := 'moon_secunda';
    Material.BlendingMode := bmTransparency;
    Shader := CgSecunda;
  end;

  with MatLib.Materials.Add do
  begin
    Name := 'moon_sun';
    Material.BlendingMode := bmTransparency;
    Shader := CgSun;
  end;
end;

// ---------------------------AssignMaterials---------------
procedure TMainForm.AssignMaterials;
begin
  with SbBackground do
  begin
    MaterialLibrary := MatLib;
    MatNameTop := 'background';
    MatNameRight := 'background';
    MatNameFront := 'background';
    MatNameLeft := 'background';
    MatNameBack := 'background';
    MatNameBottom := 'background';
  end;

  with SbClouds do
  begin
    MaterialLibrary := MatLib;
    MatNameClouds := 'clouds';
  end;

  with sprMasser.Material do
  begin
    MaterialLibrary := MatLib;
    LibMaterialName := 'moon_masser';
  end;

  with sprSecunda.Material do
  begin
    MaterialLibrary := MatLib;
    LibMaterialName := 'moon_secunda';
  end;

  with sprSun.Material do
  begin
    MaterialLibrary := MatLib;
    LibMaterialName := 'moon_sun';
  end;
end;

// ---------------------------GLSVMouseDown-----------------
procedure TMainForm.GLSVMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  mx := X;
  my := Y;
end;

// ---------------------------GLSVMouseMove-----------------
procedure TMainForm.GLSVMouseMove(Sender: TObject; Shift: TShiftState;
  X, Y: Integer);
begin
  if Shift = [ssRight] then
    cam.MoveAroundTarget(my - Y, mx - X);
  mx := X;
  my := Y;
end;

// ---------------------------FormMouseWheel----------------
procedure TMainForm.FormMouseWheel(Sender: TObject; Shift: TShiftState;
  WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
begin
  cam.AdjustDistanceToTarget(Power(1.1, WheelDelta / 100));
end;

// ---------------------------TimerTimer--------------------
procedure TMainForm.TimerTimer(Sender: TObject);
begin
  PanelFPS.Caption := GLSV.FramesPerSecondText(2);
  GLSV.ResetPerformanceMonitor;
end;

// ---------------------------CadencerProgress--------------
procedure TMainForm.CadencerProgress(Sender: TObject;
  const deltaTime, newTime: Double);
begin
  HandleKeys;
  case DayMode of
    1: // day
      begin
        bg_w1 := bg_w1 + deltaTime * Coeff;
        if bg_w1 > 1 then
          bg_w1 := 1;
        bg_w2 := bg_w2 - deltaTime * Coeff;
        if bg_w2 < 0 then
          bg_w2 := 0;
        m_w := m_w - deltaTime * Coeff;
        if m_w < 0 then
          m_w := 0;
      end;
    2: // night
      begin
        bg_w1 := bg_w1 - deltaTime * Coeff;
        if bg_w1 < 0 then
          bg_w1 := 0;
        bg_w2 := bg_w2 + deltaTime * Coeff;
        if bg_w2 > 1 then
          bg_w2 := 1;
        m_w := m_w + deltaTime * Coeff;
        if m_w > 1 then
          m_w := 1;

        if bg_w2 > 0.3 then
          a_w := a_w - deltaTime * Coeff
        else
          a_w := a_w + deltaTime * Coeff;

        if a_w < 0 then
          a_w := 0.01;
      end;
  end;

  case WeatherMode of
    1:
      begin
        c_w1 := c_w1 - deltaTime * Coeff;
        if c_w1 < 0 then
          c_w1 := 0;
        c_w2 := c_w2 + deltaTime * Coeff;
        if c_w2 > 1 then
          c_w2 := 1;
      end;
    0:
      begin
        c_w1 := c_w1 + deltaTime * Coeff;
        if c_w1 > 1 then
          c_w1 := 1;
        c_w2 := c_w2 - deltaTime * Coeff;
        if c_w2 < 0 then
          c_w2 := 0;
      end;

  end;
  GLSV.Invalidate;
end;

// ---------------------------HandleKeys--------------------
procedure TMainForm.HandleKeys;
begin
  if IsKeyDown('c') then           // weather1
    WeatherMode := 0
  else if IsKeyDown('s') then      // weather2
    WeatherMode := 1
  else if IsKeyDown('n') then      // night
    DayMode := 2
  else if IsKeyDown('d') then      // day
    DayMode := 1
  else

end;

// ---------------------------CgShaderApplyFP---------------
procedure TMainForm.CgBackgroundApplyFP(CgProgram: TCgProgram; Sender: TObject);
var
  w1, w2: single;
begin
  with CgProgram.ParamByName('channel1') do
  begin
    SetAsTexture2d(MatLib.LibMaterialByName('day').Material.Texture.Handle);
    EnableTexture;
  end;
  with CgProgram.ParamByName('channel2') do
  begin
    SetAsTexture2d(MatLib.LibMaterialByName('night')
      .Material.Texture.Handle);
    EnableTexture;
  end;
  CgProgram.ParamByName('w1').SetAsScalar(bg_w1);
  CgProgram.ParamByName('w2').SetAsScalar(bg_w2);
end;

// ---------------------------CgShaderUnApplyFP-------------
procedure TMainForm.CgBackgroundUnApplyFP(CgProgram: TCgProgram);
begin
  CgProgram.ParamByName('channel1').DisableTexture;
  CgProgram.ParamByName('channel2').DisableTexture;
end;

// ---------------------------CgShaderCloudsApplyFP---------
procedure TMainForm.CgCloudsApplyFP(CgProgram: TCgProgram; Sender: TObject);
begin
  with CgProgram.ParamByName('channel1') do
  begin
    SetAsTexture2d(MatLib.LibMaterialByName('clouds_clear')
      .Material.Texture.Handle);
    EnableTexture;
  end;
  with CgProgram.ParamByName('channel2') do
  begin
    SetAsTexture2d(MatLib.LibMaterialByName('clouds_cloudy')
      .Material.Texture.Handle);
    EnableTexture;
  end;
  // if a_w < 0.1 then
  // a:= 0.5;
  CgProgram.ParamByName('w1').SetAsScalar(c_w1);
  CgProgram.ParamByName('w2').SetAsScalar(c_w2 - bg_w2 / 2);
  if a_w > 0 then
  begin
    CgProgram.ParamByName('redoffset1').SetAsScalar(a_w);
    CgProgram.ParamByName('redoffset2').SetAsScalar(a_w);
  end;
end;

// ---------------------------CgCloudsApplyVP---------------
procedure TMainForm.CgCloudsApplyVP(CgProgram: TCgProgram; Sender: TObject);
begin
  //
end;

// ---------------------------CgShaderCloudsUnApplyFP-------
procedure TMainForm.CgCloudsUnApplyFP(CgProgram: TCgProgram);
begin
  CgProgram.ParamByName('channel1').DisableTexture;
  CgProgram.ParamByName('channel2').DisableTexture;
end;

// ---------------------------CgMoonApplyFP-----------------
procedure TMainForm.CgMasserApplyFP(CgProgram: TCgProgram; Sender: TObject);
begin
  with CgProgram.ParamByName('channel1') do
  begin
    SetAsTexture2d(MatLib.LibMaterialByName('masser').Material.Texture.Handle);
    EnableTexture;
  end;
  CgProgram.ParamByName('w').SetAsScalar(m_w);
end;

// ---------------------------CgMoonUnApplyFP---------------
procedure TMainForm.CgMasserUnApplyFP(CgProgram: TCgProgram);
begin
  CgProgram.ParamByName('channel1').DisableTexture;
end;

// ---------------------------CgSecundaApplyFP--------------
procedure TMainForm.CgSecundaApplyFP(CgProgram: TCgProgram; Sender: TObject);
begin
  with CgProgram.ParamByName('channel1') do
  begin
    SetAsTexture2d(MatLib.LibMaterialByName('secunda').Material.Texture.Handle);
    EnableTexture;
  end;
  CgProgram.ParamByName('w').SetAsScalar(m_w);
end;

// ---------------------------CgSecundaUnApplyFP------------
procedure TMainForm.CgSecundaUnApplyFP(CgProgram: TCgProgram);
begin
  CgProgram.ParamByName('channel1').DisableTexture;
end;

// ---------------------------CgSunApplyFP------------------
procedure TMainForm.CgSunApplyFP(CgProgram: TCgProgram; Sender: TObject);
begin
  with CgProgram.ParamByName('channel1') do
  begin
    SetAsTexture2d(MatLib.LibMaterialByName('sun').Material.Texture.Handle);
    EnableTexture;
  end;
  CgProgram.ParamByName('w').SetAsScalar(1.2 * (1 - m_w));
end;

// ---------------------------CgSunUnApplyFP----------------
procedure TMainForm.CgSunUnApplyFP(CgProgram: TCgProgram);
begin
  CgProgram.ParamByName('channel1').DisableTexture;
end;

end.