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// This code was written for the OpenTK library and has been released
// to the Public Domain.
// It is provided "as is" without express or implied warranty of any kind.
using System;
using System.Drawing;
using System.Collections.Generic;
using System.Diagnostics;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK.Input;
namespace Examples.Tutorial
{
[Example( "Anaglyph Stereo", ExampleCategory.OpenGL, "1.x", Documentation = "Anaglyph" )]
class Anaglyph : GameWindow
{
Examples.Shapes.DrawableShape Object;
/// <summary>Creates a 800x600 window with the specified title.</summary>
public Anaglyph()
: base(800, 600, GraphicsMode.Default, "OpenTK Quick Start Sample", GameWindowFlags.Default, DisplayDevice.Default, 3, 1, GraphicsContextFlags.Default)
{
VSync = VSyncMode.On;
}
/// <summary>Load resources here.</summary>
/// <param name="e">Not used.</param>
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
GL.ClearColor(System.Drawing.Color.Black);
GL.Enable(EnableCap.DepthTest);
GL.Enable( EnableCap.Lighting );
GL.Enable( EnableCap.Light0 );
Object = new Examples.Shapes.MengerSponge(1.0, Shapes.MengerSponge.eSubdivisions.Two, true );
// Object = new Examples.Shapes.TorusKnot( 256, 32, 0.1, 3, 4, 1, true );
}
protected override void OnUnload( EventArgs e )
{
base.OnUnload( e );
Object.Dispose();
}
/// <summary>
/// Called when your window is resized. Set your viewport here. It is also
/// a good place to set up your projection matrix (which probably changes
/// along when the aspect ratio of your window).
/// </summary>
/// <param name="e">Not used.</param>
protected override void OnResize(EventArgs e)
{
base.OnResize(e);
GL.Viewport(ClientRectangle);
}
/// <summary>
/// Called when it is time to setup the next frame. Add you game logic here.
/// </summary>
/// <param name="e">Contains timing information for framerate independent logic.</param>
protected override void OnUpdateFrame(FrameEventArgs e)
{
base.OnUpdateFrame(e);
var keyboard = OpenTK.Input.Keyboard.GetState();
if (keyboard[Key.Escape])
Exit();
}
struct Camera
{
public Vector3 Position, Direction, Up;
public double NearPlane, FarPlane;
public double EyeSeparation;
public double Aperture; // FOV in degrees
public double FocalLength;
}
enum Eye
{
left,
right,
}
void SetupCamera( Eye eye )
{
Camera camera;
camera.Position = Vector3.UnitZ;
camera.Up = Vector3.UnitY;
camera.Direction = -Vector3.UnitZ;
camera.NearPlane = 1.0;
camera.FarPlane = 5.0;
camera.FocalLength = 2.0;
camera.EyeSeparation = camera.FocalLength / 30.0;
camera.Aperture = 75.0;
double left, right,
bottom, top;
double widthdiv2 = camera.NearPlane * Math.Tan( MathHelper.DegreesToRadians( (float)( camera.Aperture / 2.0 ) ) ); // aperture in radians
double precalc1 = ClientRectangle.Width / (double)ClientRectangle.Height * widthdiv2;
double precalc2 = 0.5 * camera.EyeSeparation * camera.NearPlane / camera.FocalLength;
Vector3 Right = Vector3.Cross( camera.Direction, camera.Up ); // Each unit vectors
Right.Normalize();
Right.X *= (float)( camera.EyeSeparation / 2.0 );
Right.Y *= (float)( camera.EyeSeparation / 2.0 );
Right.Z *= (float)( camera.EyeSeparation / 2.0 );
// Projection Matrix
top = widthdiv2;
bottom = -widthdiv2;
if ( eye == Eye.right )
{
left = -precalc1 - precalc2;
right = precalc1 - precalc2;
}
else
{
left = -precalc1 + precalc2;
right = precalc1 + precalc2;
}
GL.MatrixMode( MatrixMode.Projection );
GL.LoadIdentity();
GL.Frustum( left, right, bottom, top, camera.NearPlane, camera.FarPlane );
// Modelview Matrix
Matrix4 modelview;
if ( eye == Eye.right )
{
modelview = Matrix4.LookAt(
new Vector3( camera.Position.X + Right.X, camera.Position.Y + Right.Y, camera.Position.Z + Right.Z ),
new Vector3( camera.Position.X + Right.X + camera.Direction.X, camera.Position.Y + Right.Y + camera.Direction.Y, camera.Position.Z + Right.Z + camera.Direction.Z ),
camera.Up );
}
else
{
modelview = Matrix4.LookAt(
new Vector3( camera.Position.X - Right.X, camera.Position.Y - Right.Y, camera.Position.Z - Right.Z ),
new Vector3( camera.Position.X - Right.X + camera.Direction.X, camera.Position.Y - Right.Y + camera.Direction.Y, camera.Position.Z - Right.Z + camera.Direction.Z ),
camera.Up );
}
GL.MatrixMode( MatrixMode.Modelview );
GL.LoadIdentity();
GL.MultMatrix( ref modelview );
}
float Angle;
void Draw()
{
GL.Translate( 0f, 0f, -2f );
GL.Rotate( Angle, Vector3.UnitY );
Object.Draw();
}
/// <summary>
/// Called when it is time to render the next frame. Add your rendering code here.
/// </summary>
/// <param name="e">Contains timing information.</param>
protected override void OnRenderFrame( FrameEventArgs e )
{
Angle += (float)(e.Time *20.0);
GL.Clear( ClearBufferMask.DepthBufferBit | ClearBufferMask.ColorBufferBit );
SetupCamera( Eye.right );
GL.ColorMask( true, false, false, true );
Draw();
GL.Clear( ClearBufferMask.DepthBufferBit ); //
SetupCamera( Eye.left );
GL.ColorMask( false, true, true, true );
Draw();
GL.ColorMask( true, true, true, true );
SwapBuffers();
}
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
// The 'using' idiom guarantees proper resource cleanup.
// We request 30 UpdateFrame events per second, and unlimited
// RenderFrame events (as fast as the computer can handle).
using (Anaglyph game = new Anaglyph())
{
game.Run(10.0);
}
}
}
}
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