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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.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Threading;
using OpenTK;
using System.Diagnostics;
using OpenTK.Input;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
namespace Examples.Tutorial
{
/// <summary>
/// Demonstrates Vertex Arrays (in system memory). Example is incomplete (documentation).
/// Broken since release 0.3.12.
/// </summary>
[Example("Vertex Arrays", ExampleCategory.OpenGL, "1.x", 5, false)]
class T02_Vertex_Arrays : GameWindow
{
float rotation_speed = 3.0f;
float angle = 0.0f;
Shapes.Shape shape = new Examples.Shapes.Plane(16, 16, 2.0f, 2.0f);
//TextureFont sans = new TextureFont(new Font(FontFamily.GenericSansSerif, 32, FontStyle.Regular,
// GraphicsUnit.Pixel));
#region Constructor
public T02_Vertex_Arrays()
: base(800, 600)
{
//this.VSync = VSyncMode.On;
KeyUp += Keyboard_KeyUp;
}
void Keyboard_KeyUp(object sender, KeyboardKeyEventArgs e)
{
// F4 cycles between available VSync modes.
if (e.Key == Key.F4)
{
if (this.VSync == VSyncMode.Off)
this.VSync = VSyncMode.On;
else if (this.VSync == VSyncMode.On)
this.VSync = VSyncMode.Adaptive;
else
this.VSync = VSyncMode.Off;
}
}
#endregion
#region OnLoad
protected override void OnLoad(EventArgs e)
{
GL.Enable(EnableCap.Texture2D);
GL.ClearColor(Color.CadetBlue);
GL.Enable(EnableCap.DepthTest);
GL.EnableClientState(ArrayCap.VertexArray);
//GL.EnableClientState(GL.Enums.EnableCap.COLOR_ARRAY);
GL.VertexPointer(3, VertexPointerType.Float, 0, shape.Vertices);
//GL.ColorPointer(4, GL.Enums.ColorPointerType.UNSIGNED_BYTE, 0, shape.Colors);
}
#endregion
#region OnResize
/// <summary>
/// Called when the user resizes the window.
/// </summary>
/// <param name="e">Contains the new width/height of the window.</param>
/// <remarks>
/// You want the OpenGL viewport to match the window. This is the place to do it!
/// </remarks>
protected override void OnResize(EventArgs e)
{
base.OnResize(e);
GL.Viewport(0, 0, Width, Height);
double aspect_ratio = Width / (double)Height;
OpenTK.Matrix4 perspective = OpenTK.Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver4, (float)aspect_ratio, 1, 64);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadMatrix(ref perspective);
}
#endregion
#region OnUpdateFrame
/// <summary>
/// Prepares the next frame for rendering.
/// </summary>
/// <remarks>
/// Place your control logic here. This is the place to respond to user input,
/// update object positions etc.
/// </remarks>
protected override void OnUpdateFrame(FrameEventArgs e)
{
var keyboard = OpenTK.Input.Keyboard.GetState();
if (keyboard[Key.Escape])
{
this.Exit();
return;
}
if (keyboard[Key.F11])
if (WindowState != WindowState.Fullscreen)
WindowState = WindowState.Fullscreen;
else
WindowState = WindowState.Normal;
// Plus/Minus change the target render frequency.
// PageUp/PageDown change the target update frequency.
if (keyboard[Key.Plus] || keyboard[Key.KeypadAdd]) TargetRenderFrequency++;
if (keyboard[Key.Minus] || keyboard[Key.KeypadSubtract]) TargetRenderFrequency--;
if (keyboard[Key.PageUp]) TargetUpdateFrequency++;
if (keyboard[Key.PageDown]) TargetUpdateFrequency--;
// Right/Left control the rotation speed and direction.
if (keyboard[Key.Right]) rotation_speed += 0.5f;
if (keyboard[Key.Left]) rotation_speed -= 0.5f;
}
#endregion
#region OnRenderFrame
/// <summary>
/// Place your rendering code here.
/// </summary>
protected override void OnRenderFrame(FrameEventArgs e)
{
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
Matrix4 lookat = Matrix4.LookAt(0, 5, 5, 0, 0, 0, 0, 1, 0);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadMatrix(ref lookat);
angle += rotation_speed * (float)e.Time;
if (angle >= 360.0f)
angle -= 360.0f;
GL.Rotate(angle, 0.0f, 1.0f, 0.0f);
GL.DrawElements(PrimitiveType.Triangles, shape.Indices.Length,
DrawElementsType.UnsignedInt, shape.Indices);
//GL.Begin(GL.Enums.BeginMode.TRIANGLES);
//GL.Vertex3(-1.0, -1.0, 5.0);
//GL.Vertex3(1.0, -1.0, 5.0);
//GL.Vertex3(1.0, 1.0, 5.0);
//GL.End();
GL.PushMatrix();
GL.MatrixMode(MatrixMode.Projection);
GL.LoadIdentity();
GL.Ortho(-1.0, 1.0, -1.0, 1.0, 0.0, 1.0);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
//GL.Translate(0.7f, 1.0f, 0.0f);
//sans.Print(String.format("{0:f1}", RenderFrequency));
GL.PopMatrix();
SwapBuffers();
}
#endregion
#region public void Launch()
/// <summary>
/// Launches this example.
/// </summary>
/// <remarks>
/// Provides a simple way for the example launcher to launch the examples.
/// </remarks>
public void Launch()
{
// Lock UpdateFrame rate at 30Hz and RenderFrame rate 85Hz.
//Run(60.0, 85.0);
Run(30.0, 85.0);
}
#endregion
public static readonly int order = 2;
}
}
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