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GLControlGameLoop.cs
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GLControlGameLoop.cs
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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.
#region --- Using directives ---
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Threading;
using OpenTK.Graphics.OpenGL;
using OpenTK.Platform;
using OpenTK;
#endregion
namespace Examples.WinForms
{
[Example("Simple GLControl Game Loop", ExampleCategory.OpenTK, "GLControl", 2, Documentation="GLControlGameLoop")]
public partial class GameLoopForm : Form
{
static float angle = 0.0f;
#region --- Constructor ---
public GameLoopForm()
{
InitializeComponent();
}
#endregion
#region OnLoad
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
glControl.KeyDown += new KeyEventHandler(glControl_KeyDown);
glControl.KeyUp += new KeyEventHandler(glControl_KeyUp);
glControl.Resize += new EventHandler(glControl_Resize);
glControl.Paint += new PaintEventHandler(glControl_Paint);
Text =
GL.GetString(StringName.Vendor) + " " +
GL.GetString(StringName.Renderer) + " " +
GL.GetString(StringName.Version);
GL.ClearColor(Color.MidnightBlue);
GL.Enable(EnableCap.DepthTest);
Application.Idle += Application_Idle;
// Ensure that the viewport and projection matrix are set correctly.
glControl_Resize(glControl, EventArgs.Empty);
}
void glControl_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.F12)
{
GrabScreenshot().Save("screenshot.png");
}
}
#endregion
#region OnClosing
protected override void OnClosing(CancelEventArgs e)
{
Application.Idle -= Application_Idle;
base.OnClosing(e);
}
#endregion
#region Application_Idle event
void Application_Idle(object sender, EventArgs e)
{
while (glControl.IsIdle)
{
Render();
}
}
#endregion
#region GLControl.Resize event handler
void glControl_Resize(object sender, EventArgs e)
{
OpenTK.GLControl c = sender as OpenTK.GLControl;
if (c.ClientSize.Height == 0)
c.ClientSize = new System.Drawing.Size(c.ClientSize.Width, 1);
GL.Viewport(0, 0, c.ClientSize.Width, c.ClientSize.Height);
float aspect_ratio = Width / (float)Height;
Matrix4 perpective = Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver4, aspect_ratio, 1, 64);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadMatrix(ref perpective);
}
#endregion
#region GLControl.KeyDown event handler
void glControl_KeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyData)
{
case Keys.Escape:
this.Close();
break;
}
}
#endregion
#region GLControl.Paint event handler
void glControl_Paint(object sender, PaintEventArgs e)
{
Render();
}
#endregion
#region private void Render()
private void Render()
{
Matrix4 lookat = Matrix4.LookAt(0, 5, 5, 0, 0, 0, 0, 1, 0);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadMatrix(ref lookat);
GL.Rotate(angle, 0.0f, 1.0f, 0.0f);
angle += 0.5f;
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
DrawCube();
glControl.SwapBuffers();
}
#endregion
#region private void DrawCube()
private void DrawCube()
{
GL.Begin(BeginMode.Quads);
GL.Color3(Color.Silver);
GL.Vertex3(-1.0f, -1.0f, -1.0f);
GL.Vertex3(-1.0f, 1.0f, -1.0f);
GL.Vertex3(1.0f, 1.0f, -1.0f);
GL.Vertex3(1.0f, -1.0f, -1.0f);
GL.Color3(Color.Honeydew);
GL.Vertex3(-1.0f, -1.0f, -1.0f);
GL.Vertex3(1.0f, -1.0f, -1.0f);
GL.Vertex3(1.0f, -1.0f, 1.0f);
GL.Vertex3(-1.0f, -1.0f, 1.0f);
GL.Color3(Color.Moccasin);
GL.Vertex3(-1.0f, -1.0f, -1.0f);
GL.Vertex3(-1.0f, -1.0f, 1.0f);
GL.Vertex3(-1.0f, 1.0f, 1.0f);
GL.Vertex3(-1.0f, 1.0f, -1.0f);
GL.Color3(Color.IndianRed);
GL.Vertex3(-1.0f, -1.0f, 1.0f);
GL.Vertex3(1.0f, -1.0f, 1.0f);
GL.Vertex3(1.0f, 1.0f, 1.0f);
GL.Vertex3(-1.0f, 1.0f, 1.0f);
GL.Color3(Color.PaleVioletRed);
GL.Vertex3(-1.0f, 1.0f, -1.0f);
GL.Vertex3(-1.0f, 1.0f, 1.0f);
GL.Vertex3(1.0f, 1.0f, 1.0f);
GL.Vertex3(1.0f, 1.0f, -1.0f);
GL.Color3(Color.ForestGreen);
GL.Vertex3(1.0f, -1.0f, -1.0f);
GL.Vertex3(1.0f, 1.0f, -1.0f);
GL.Vertex3(1.0f, 1.0f, 1.0f);
GL.Vertex3(1.0f, -1.0f, 1.0f);
GL.End();
}
#endregion
#region private void GrabScreenshot()
Bitmap GrabScreenshot()
{
Bitmap bmp = new Bitmap(this.ClientSize.Width, this.ClientSize.Height);
System.Drawing.Imaging.BitmapData data =
bmp.LockBits(this.ClientRectangle, System.Drawing.Imaging.ImageLockMode.WriteOnly,
System.Drawing.Imaging.PixelFormat.Format24bppRgb);
GL.ReadPixels(0, 0, this.ClientSize.Width, this.ClientSize.Height, PixelFormat.Bgr, PixelType.UnsignedByte,
data.Scan0);
bmp.UnlockBits(data);
bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);
return bmp;
}
#endregion
#region public static void Main()
/// <summary>
/// Entry point of this example.
/// </summary>
[STAThread]
public static void Main()
{
using (GameLoopForm example = new GameLoopForm())
{
// Get the title and category of this example using reflection.
ExampleAttribute info = ((ExampleAttribute)example.GetType().GetCustomAttributes(false)[0]);
example.Text = String.Format("OpenTK | {0} {1}: {2}", info.Category, info.Difficulty, info.Title);
example.ShowDialog();
}
}
#endregion
}
}