GLScene的一个例子之GLBlur

1. 例子的基础知识：
   

界面设计：

界面关系描述：

object Form1: TForm1
  Left = 290
  Top = 175
  Caption = 'Blur'
  ClientHeight = 462
  ClientWidth = 518
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object GLSceneViewer: TGLSceneViewer
    Left = 0
    Top = 45
    Width = 518
    Height = 417
    Camera = GLCamera1//相机
    Buffer.FogEnvironment.FogColor.Color = {1283003F1283003F0000803F0000803F}
    Buffer.FogEnvironment.FogStart = 1.000000000000000000
    Buffer.FogEnvironment.FogEnd = 3.000000000000000000
    Buffer.BackgroundColor = clBackground
    Buffer.AmbientColor.Color = {0000000000000000000000000000803F}
    FieldOfView = 153.029327392578100000
    Align = alClient
    OnMouseMove = GLSceneViewerMouseMove//鼠标事件
    TabOrder = 0
  end
  object Panel1: TPanel
    Left = 0
    Top = 0
    Width = 518
    Height = 45
    Align = alTop
    Caption = ' '
    TabOrder = 1
    object Label1: TLabel
      Left = 8
      Top = 4
      Width = 54
      Height = 13
      Caption = 'Blur Preset:'
      FocusControl = ComboBox1
    end
    object Label2: TLabel
      Left = 216
      Top = 4
      Width = 61
      Height = 13
      Caption = 'Render Size:'
      FocusControl = ComboBox2
    end
    object LabelFPS: TLabel
      Left = 376
      Top = 26
      Width = 20
      Height = 13
      Caption = 'FPS'
    end
    object ComboBox1: TComboBox
      Left = 8
      Top = 20
      Width = 161
      Height = 21
      Style = csDropDownList
      ItemIndex = 0
      TabOrder = 0
      Text = 'pNone (no change)'
      OnClick = ComboBox1Click
      Items.Strings = (
        'pNone (no change)'
        'pGlossy'
        'pBeastView'
        'pOceanDepth'
        'pDream'
        'pOverBlur'
        'pAdvancedBlur')
    end
    object ComboBox2: TComboBox
      Left = 216
      Top = 20
      Width = 145
      Height = 21
      Style = csDropDownList
      ItemIndex = 5
      TabOrder = 1
      Text = '256'
      OnChange = ComboBox2Change
      Items.Strings = (
        '8'
        '16'
        '32'
        '64'
        '128'
        '256'
        '512')
    end
  end
  object GLScene1: TGLScene
    ObjectsSorting = osRenderFarthestFirst
    Left = 44
    Top = 64
    object GLLightSource1: TGLLightSource//光源
      Ambient.Color = {BEC0403FBEC0403FBEC0403F0000803F}
      ConstAttenuation = 1.000000000000000000
      Diffuse.Color = {BEC0403FBEC0403FBEC0403F0000803F}
      Position.Coordinates = {56551B40F9FF2D40F6FF3B400000803F}
      LightStyle = lsOmni
      SpotCutOff = 180.000000000000000000
    end
    object GLCube1: TGLCube//立方体
      Material.MaterialLibrary = GLMaterialLibrary1//材质
      Material.LibMaterialName = 'LibMaterial'
      Direction.Coordinates = {82B16B3E068E77BF3986DFBD00000000}
      PitchAngle = -95.500000000000000000
      Position.Coordinates = {DB9FEC3E806395BE509F213F0000803F}
      TurnAngle = 6.500000000000000000
      Up.Coordinates = {DD7324BEE3EB17BE6BCE793F00000000}
    end
    object GLSphere1: TGLSphere//球
      Material.MaterialLibrary = GLMaterialLibrary2//材质
      Material.LibMaterialName = 'LibMaterial'
      Position.Coordinates = {6E3D38BF0A5515BE733C1CBF0000803F}
      Radius = 0.500000000000000000
    end
    object GLDummyCube1: TGLDummyCube//
      CubeSize = 1.000000000000000000
    end
    object GLCamera1: TGLCamera//相机
      DepthOfView = 100.000000000000000000
      FocalLength = 50.000000000000000000
      NearPlaneBias = 0.100000001490116100
      TargetObject = GLDummyCube1
      Position.Coordinates = {41A38A3F6847033F2894FA3F0000803F}
      Direction.Coordinates = {A5C4F6BE96EA77BE3E9257BF00000000}
      Up.Coordinates = {B74DF6BD4B62783F582A57BE00000000}
    end
  end
  object GLMaterialLibrary1: TGLMaterialLibrary
    Materials = <
      item
        Name = 'LibMaterial'
        Tag = 0
        Material.Texture.ImageClassName = 'TGLPicFileImage'//Texture是一个关注点
        Material.Texture.Image.PictureFileName = 'marbletiles.jpg'//程序运行时要加载相片
        Material.Texture.MagFilter = maNearest
        Material.Texture.MinFilter = miNearest
        Material.Texture.TextureMode = tmModulate
        Material.Texture.Compression = tcNone
        Material.Texture.Disabled = False
      end>
    TexturePaths = '..\..\..\..\media\'//相片的路径
    Left = 140
    Top = 64
  end
  object GLCadencer1: TGLCadencer//动画节拍器
    Scene = GLScene1
    SleepLength = 0
    OnProgress = GLCadencer1Progress//节拍事件
    Left = 44
    Top = 144
  end
  object Timer1: TTimer
    OnTimer = Timer1Timer
    Left = 260
    Top = 64
  end
  object GLMaterialLibrary2: TGLMaterialLibrary//第二个材质库
    Materials = <
      item
        Name = 'LibMaterial'
        Tag = 0
        Material.Texture.ImageClassName = 'TGLPicFileImage'
        Material.Texture.Image.PictureFileName = 'marbletiles.jpg'
        Material.Texture.MagFilter = maNearest
        Material.Texture.MinFilter = miNearest
        Material.Texture.TextureMode = tmModulate
        Material.Texture.Compression = tcNone
        Material.Texture.Disabled = False
      end>
    TexturePaths = '..\..\..\..\media\'
    Left = 400
    Top = 88
  end
end

 代码控制：

unit Unit1;

interface

uses
  Windows,
  Messages,
  SysUtils,
  Classes,
  Graphics,
  Controls,
  Forms,
  Dialogs,
  GLWin32Viewer,
  GLScene,
  GLObjects,
  GLTexture,
  GLHudObjects,
  GLCompositeImage,
  GLFileJPEG,
  GLCadencer,
  StdCtrls,
  ExtCtrls,
  GLBlur,
  GLCrossPlatform,
  GLMaterial,
  GLCoordinates,
  BaseClasses,
  Jpeg,
  GLUtils;

type
  TForm1 = class(TForm)
    GLScene1: TGLScene;
    GLCamera1: TGLCamera;
    GLMaterialLibrary1: TGLMaterialLibrary;
    GLCube1: TGLCube;
    GLLightSource1: TGLLightSource;
    GLSceneViewer: TGLSceneViewer;
    GLCadencer1: TGLCadencer;
    GLSphere1: TGLSphere;
    Panel1: TPanel;
    ComboBox1: TComboBox;
    Label1: TLabel;
    Label2: TLabel;
    ComboBox2: TComboBox;
    Timer1: TTimer;
    GLDummyCube1: TGLDummyCube;
    LabelFPS: TLabel;
    GLMaterialLibrary2: TGLMaterialLibrary;
    procedure FormCreate(Sender: TObject);
    procedure GLCadencer1Progress(Sender: TObject; const deltaTime,
      newTime: Double);
    procedure ComboBox1Click(Sender: TObject);
    procedure ComboBox2Change(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure GLSceneViewerMouseMove(Sender: TObject; Shift: TShiftState;
      X, Y: Integer);
  private
    { Private declarations }
    oldx, oldy: integer;
  public
    { Public declarations }
    B: TGLBlur;

  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  SetGLSceneMediaDir();
  // Add GLBlur to scene
  B := TGLBlur.Create(self);
  GLSphere1.AddChild(B);
  B.TargetObject := GLCube1;
  B.RenderWidth := 256;
  B.RenderHeight := 256;
  // Load texture for objects
  GLMaterialLibrary1.Materials[0].Material.Texture.Image.LoadFromFile('HPIM5446.JPG');//加载相片
  GLMaterialLibrary2.Materials[0].Material.Texture.Image.LoadFromFile('HPIM5446.JPG');
  ComboBox1.ItemIndex := 1;
  ComboBox2.ItemIndex := 2;
  ComboBox1Click(self);

end;

procedure TForm1.GLCadencer1Progress(Sender: TObject; const deltaTime,
  newTime: Double);
begin
  GLCube1.Turn(deltatime * 10);
  GLSphere1.Turn(deltatime * 50);
end;

procedure TForm1.ComboBox1Click(Sender: TObject);
begin
  B.Preset := TGLBlurPreset(ComboBox1.itemIndex);
end;

procedure TForm1.ComboBox2Change(Sender: TObject);
begin
  B.RenderWidth := StrToInt(ComboBox2.Items[ComboBox2.ItemIndex]);
  B.RenderHeight := B.RenderWidth;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  LabelFPS.Caption := FloatToStr(Trunc(GLSceneViewer.FramesPerSecond))+ ' FPS';
//  GLSceneViewer.ResetPerformanceMonitor;
end;

procedure TForm1.GLSceneViewerMouseMove(Sender: TObject;
  Shift: TShiftState; X, Y: Integer);
begin
  if ssLeft in Shift then
  begin
    GLCamera1.MoveAroundTarget(1 * (oldy - y), 1 * (oldx - x));
  end;
  oldx := x;
  oldy := y;
end;

end.