OpenGL Rendering

type
  TOpenGLEditorForm = class(TForm)
    Chart1: TChart;
    TeeOpenGL1: TTeeOpenGL;  // Add OpenGL component
    Series1: TBar3DSeries;
    procedure CheckBox1Click(Sender: TObject);
  end;

procedure TOpenGLEditorForm.CheckBox1Click(Sender: TObject);
begin
  Screen.Cursor := crHourGlass;
  try
    TeeOpenGL1.Active := CheckBox1.Checked;  // Enable/disable OpenGL
  finally
    Screen.Cursor := crDefault;
  end;
end;

uses
  TeeOpenGL,    // TTeeOpenGL component
  TeeGLCanvas,  // OpenGL canvas implementation
  OpenGL2;      // OpenGL API bindings (Windows)

uses
  OpenGLLinux;  // Linux OpenGL support

procedure TOpenGLCanvas.Chart1AfterDraw(Sender: TObject);
var 
  x: Integer;
begin
  With Chart1.Canvas do
  begin
    Brush.Style := bsSolid;
    Pen.Style := psClear;
    
    if CheckBox1.Checked then 
      Pen.Style := psSolid;
    
    Pen.Color := clBlack;
    x := ChartXCenter;
    
    // Draw textured cube
    if CheckBox2.Checked then 
      Brush.Bitmap := MyBitmap1;
    Cube(x-500, x+500, 500, 550, -500, 500, True);
    
    // Draw multiple cubes with different textures
    if CheckBox2.Checked then 
      Brush.Bitmap := MyBitmap0;
    Cube(x-500, x-450, 0, 500, -500, 500, True);
    Cube(x-450, x-100, 0, 500, -500, -400, True);
    Cube(x-450, x-100, 0, 500, 400, 500, True);
    
    Brush.Bitmap := nil;
    
    // Draw colored shapes
    Brush.Color := RGB(200, 200, 250);
    if CheckBox2.Checked then 
      Brush.Bitmap := MyBitmap2;
  end;
end;

var
  MyBitmap: TBitmap;
begin
  MyBitmap := TBitmap.Create;
  try
    MyBitmap.LoadFromFile('texture.bmp');
    Chart1.Canvas.Brush.Bitmap := MyBitmap;
    Chart1.Canvas.Cube(0, 100, 0, 100, 0, 100, True);
  finally
    Chart1.Canvas.Brush.Bitmap := nil;
    MyBitmap.Free;
  end;
end;

var
  Series1: TSurfaceSeries;
begin
  Series1 := TSurfaceSeries.Create(Self);
  Series1.ParentChart := Chart1;
  
  // Enable OpenGL for fast rendering
  TeeOpenGL1.Active := True;
  
  // Configure surface
  Series1.UseColorRange := True;
  Series1.UsePalette := True;
  Series1.IrregularGrid := False;
  
  // Fill with data
  Series1.FillSampleValues(50);
end;

TeeOpenGL1.Active := True;
TeeOpenGL1.AntiAliasLines := True;
TeeOpenGL1.AntiAliasPolygons := True;

Chart1.View3D := True;
Chart1.Chart3DPercent := 100;

// Configure lighting
with Chart1.View3DOptions do
begin
  Zoom := 90;
  Elevation := 345;
  Rotation := 340;
  Perspective := 50;
  Orthogonal := False;
end;

var
  Series1: TTriSurfaceSeries;
begin
  Series1 := TTriSurfaceSeries.Create(Self);
  Series1.ParentChart := Chart1;
  
  // OpenGL dramatically improves performance
  TeeOpenGL1.Active := True;
  
  // Add irregular 3D points
  Series1.Add(10, 20, 30);
  Series1.Add(15, 25, 35);
  // ... more points
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  // Update rotation
  Chart1.View3DOptions.Rotation := Chart1.View3DOptions.Rotation + 2;
  
  // Invalidate forces redraw (fast with OpenGL)
  Chart1.Invalidate;
end;

uses
  TeeGLEditor;  // Important for OpenGL editor at runtime!

procedure TForm1.Button1Click(Sender: TObject);
begin
  ChartEditor1.Execute;  // Shows OpenGL tab in editor
end;

with TeeOpenGL1 do
begin
  Active := True;
  
  // Anti-aliasing
  AntiAliasLines := True;
  AntiAliasPolygons := True;
  
  // Lighting
  Light := True;
  Ambient := 30;
  Diffuse := 70;
  Shininess := 50;
  
  // Performance
  FastPoints := True;
  FastLines := True;
  
  // Quality
  HighQuality := True;
end;

uses
  TeeMakerEditor, 
  TeeProcs, 
  TeeDraw3D, 
  TeCanvas, 
  TeeOpenGL,
  TeeMakerControl, 
  OpenGL2;

procedure TMakerEditor1.BCompileShaderClick(Sender: TObject);
begin
  // Compile vertex and fragment shaders
  CompileGLSLShader(
    MemoVertexShader.Text,
    MemoFragmentShader.Text
  );
end;

if not TeeOpenGL1.CanCreate then
begin
  ShowMessage('OpenGL not available on this system');
  TeeOpenGL1.Active := False;
end;

// Free OpenGL resources when done
procedure TForm1.FormDestroy(Sender: TObject);
begin
  TeeOpenGL1.Active := False;  // Release OpenGL context
end;

// Display in TabGLExtensions
MemoExtensions.Lines.Add(glGetString(GL_EXTENSIONS));
MemoGLInfo.Lines.Add('Vendor: ' + glGetString(GL_VENDOR));
MemoGLInfo.Lines.Add('Renderer: ' + glGetString(GL_RENDERER));
MemoGLInfo.Lines.Add('Version: ' + glGetString(GL_VERSION));

{$IFDEF LINUX}
uses OpenGLLinux;
{$ELSE}
uses OpenGL2;
{$ENDIF}

procedure TForm1.FormCreate(Sender: TObject);
begin
  // Activate OpenGL before adding data
  TeeOpenGL1.Active := True;
  Series1.FillSampleValues(10000);
end;

Chart1.AutoRepaint := False;
try
  // Add many points
  for i := 0 to 10000 do
    Series1.Add(Random(100));
finally
  Chart1.AutoRepaint := True;
  Chart1.Invalidate;
end;

// For massive datasets, use FastLine with OpenGL
Series1 := TFastLineSeries.Create(Self);
TeeOpenGL1.Active := True;

procedure TForm1.MeasureRenderTime;
var
  Start: TDateTime;
begin
  Start := Now;
  Chart1.Draw;
  Label1.Caption := Format('Render: %.2f ms', 
    [(Now - Start) * 24 * 60 * 60 * 1000]);
end;