GLScene/Demos/rendering/tobitmap/fTobitmap.pas

unit fTobitmap;

interface

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

  GLS.Scene,
  GLS.VectorTypes,
  GLS.Cadencer,
  GLS.Objects,
  GLS.SceneViewer,
  GLS.HUDObjects,
  GLS.SpaceText,
 
  GLS.Coordinates,
  GLS.Graphics,
  GLS.Utils,
  GLS.BaseClasses;

type
  TForm1 = class(TForm)
    GLSceneViewer1: TGLSceneViewer;
    GLScene1: TGLScene;
    Panel1: TPanel;
    GLCamera1: TGLCamera;
    GLLightSource1: TGLLightSource;
    Plane1: TGLPlane;
    Sphere1: TGLSphere;
    GLCadencer1: TGLCadencer;
    DummyCube1: TGLDummyCube;
    HUDSprite1: TGLHUDSprite;
    BUSnapShot: TButton;
    BURenderToBitmap: TButton;
    BUBitmapx2: TButton;
    BUBitmap600: TButton;
    BUBitmap300: TButton;
    SpaceText1: TGLSpaceText;
    BUViewerSnapShot: TButton;
    procedure Sphere1Progress(Sender: TObject; const deltaTime,
      newTime: Double);
    procedure FormCreate(Sender: TObject);
    procedure FormResize(Sender: TObject);
    procedure BUSnapShotClick(Sender: TObject);
    procedure BURenderToBitmapClick(Sender: TObject);
    procedure BUBitmapx2Click(Sender: TObject);
    procedure BUBitmap600Click(Sender: TObject);
    procedure BUBitmap300Click(Sender: TObject);
    procedure BUViewerSnapShotClick(Sender: TObject);
  private
     
    procedure RenderToBitmap(scale : Single);
  public
     
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses
  TobitmapImgFm;
(*
   A utility function, this takes the bitmap and uses Form2 to display it with
   a regular TImage component.
*)
procedure ViewBitmap(aBitmap : TBitmap; caption : String);
var
   f : TForm2;
begin
   Application.CreateForm(TForm2, f);
   if (aBitmap.Width<Screen.Width) and (aBitmap.Height<Screen.Height) then begin
      f.ClientWidth:=aBitmap.Width;
      f.ClientHeight:=aBitmap.Height;
   end else begin
      f.ClientWidth:=Round(Screen.Width*0.75);
      f.ClientHeight:=Round(Screen.Height*0.75);
   end;
   f.Image1.Picture.Bitmap:=aBitmap;
   f.Caption:=caption;
   f.Image1.Width:=aBitmap.Width;
   f.Image1.Height:=aBitmap.Height;
   f.Show;
end;

//
// Utility stuff: load textures, animate the sphere and support resizing.
//

procedure TForm1.FormCreate(Sender: TObject);
begin
   SetGLSceneMediaDir();
   HUDSprite1.Material.Texture.Image.LoadFromFile('ashwood.jpg');
   Plane1.Material.Texture.Image.LoadFromFile('marbletiles.jpg');
   Sphere1.Material.Texture.Image.LoadFromFile('marbletiles.jpg');
end;


procedure TForm1.BUViewerSnapShotClick(Sender: TObject);
var
   pt : Int64;
   bmp : TBitmap;
   delta : Double;
begin
   pt:=StartPrecisionTimer;
   // Create a snapshot directly from the viewer content
   bmp:=GLSceneViewer1.CreateSnapShotBitmap;
   delta:=StopPrecisionTimer(pt);
   // Display the bitmap for the user to see and gaze in everlasting awe...
   ViewBitmap(bmp, Format('SnapShot %dx%d - %.3f ms',
                          [bmp.Width, bmp.Height, delta*1000]));
   // Release the bitmap
   bmp.Free;
end;

procedure TForm1.BUSnapShotClick(Sender: TObject);
var
   bmp32 : TGLBitmap32;
   bmp : TBitmap;
   pt : Int64;
   delta : Double;
begin
   pt:=StartPrecisionTimer;
   // CreateSnapShot returns a TGLBitmap32, which is a low-level data buffer.
   // However TGLBitmap32 can spawn a regular TBitmap, which we use here
   bmp32:=GLSceneViewer1.Buffer.CreateSnapShot;
   bmp:=bmp32.Create32BitsBitmap;
   delta:=StopPrecisionTimer(pt);
   // Display the bitmap for the user to see and gaze in everlasting awe...
   ViewBitmap(bmp, Format('SnapShot %dx%d - %.3f ms',
                          [bmp.Width, bmp.Height, delta*1000]));
   // Don't forget to free your TGLBitmap32 and TBitmap!
   bmp.Free;
   bmp32.Free;
end;

procedure TForm1.RenderToBitmap(scale : Single);
var
   bmp : TBitmap;
   pt : Int64;
   delta : Double;
begin
   pt:=StartPrecisionTimer;
   // Rendering to a bitmap requires an existing bitmap,
   // so we create and size a new one
   bmp:=TBitmap.Create;
   // Don't forget to specify a PixelFormat, or current screen pixel format
   // will be used, which may not suit your purposes!
   bmp.PixelFormat:=pf24bit;
   bmp.Width:=Round(GLSceneViewer1.Width*scale);
   bmp.Height:=Round(GLSceneViewer1.Height*scale);
   // Here we just request a render
   // The second parameter specifies DPI (Dots Per Inch), which is
   // linked to the bitmap's scaling
   // "96" is the "magic" DPI scale of the screen under windows
   GLSceneViewer1.Buffer.RenderToBitmap(bmp, Round(96*scale));
   delta:=StopPrecisionTimer(pt);
   ViewBitmap(bmp, Format('RenderToBitmap %dx%d - %.1f ms',
                          [bmp.Width, bmp.Height, delta*1000]));
   bmp.Free;
end;

procedure TForm1.BURenderToBitmapClick(Sender: TObject);
begin
   // Render at viewer resolution (scale = 1, DPI = 96)
   RenderToBitmap(1);
end;

procedure TForm1.BUBitmapx2Click(Sender: TObject);
begin
   // Render at twice viewer resolution (scale = 2, DPI = 192 = 96x2)
   RenderToBitmap(2);
end;

procedure TForm1.BUBitmap300Click(Sender: TObject);
begin
   // Screen is "magic" 96 dpi, this gives us our scale
   RenderToBitmap(300/96);
end;

procedure TForm1.BUBitmap600Click(Sender: TObject);
begin
   // Screen is "magic" 96 dpi, this gives us our scale
   RenderToBitmap(600/96);
end;

procedure TForm1.Sphere1Progress(Sender: TObject; const deltaTime,
  newTime: Double);
var
   h : Single;
begin
   h:=2.5+2*Sin(newTime*4);
   Sphere1.Position.Y:=h;
   if h<1 then
      Sphere1.Scale.Y:=h
   else Sphere1.Scale.Y:=1;
end;

procedure TForm1.FormResize(Sender: TObject);
begin
   with HUDSprite1 do begin
      Width:=GLSceneViewer1.Width;
      Position.X:=Width*0.5;
      Height:=GLSceneViewer1.Height;
      Position.Y:=Height*0.5;
   end;
end;

end.