OpenTK

Imports OpenTK
Imports OpenTK.Graphics
Imports OpenTK.Graphics.OpenGL

Public Class Form1

    Private Sub GlControl1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GlControl1.Load
        'Control is loaded, set back color
        GL.ClearColor(Color.Black)
    End Sub

    Private Sub GlControl1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles GlControl1.Paint
        'First Clear Buffers
        GL.Clear(ClearBufferMask.ColorBufferBit)
        GL.Clear(ClearBufferMask.DepthBufferBit)

        'Basic Setup for viewing
        Dim perspective As Matrix4 = Matrix4.CreatePerspectiveFieldOfView(1.04, 4 / 3, 1, 10000) 'Setup Perspective
        Dim lookat As Matrix4 = Matrix4.LookAt(100, 20, 0, 0, 0, 0, 0, 1, 0) 'Setup camera
        GL.MatrixMode(MatrixMode.Projection) 'Load Perspective
        GL.LoadIdentity()
        GL.LoadMatrix(perspective)
        GL.MatrixMode(MatrixMode.Modelview) 'Load Camera
        GL.LoadIdentity()
        GL.LoadMatrix(lookat)
        GL.Viewport(0, 0, GlControl1.Width, GlControl1.Height) 'Size of window
        GL.Enable(EnableCap.DepthTest) 'Enable correct Z Drawings
        GL.DepthFunc(DepthFunction.Less) 'Enable correct Z Drawings

        'Rotating
        GL.Rotate(NumericUpDown1.Value, 0, 0, 1)
        GL.Rotate(NumericUpDown2.Value, 0, 1, 0)

        'Draw pyramid, Y is up, Z is twards you, X is left and right
        'Vertex goes (X,Y,Z)
        GL.Begin(BeginMode.Triangles)
        'Face 1
        GL.Color3(Color.Red)
        GL.Vertex3(50, 0, 0)
        GL.Color3(Color.White)
        GL.Vertex3(0, 25, 0)
        GL.Color3(Color.Blue)
        GL.Vertex3(0, 0, 50)
        'Face 2
        GL.Color3(Color.Green)
        GL.Vertex3(-50, 0, 0)
        GL.Color3(Color.White)
        GL.Vertex3(0, 25, 0)
        GL.Color3(Color.Blue)
        GL.Vertex3(0, 0, 50)
        'Face 3
        GL.Color3(Color.Red)
        GL.Vertex3(50, 0, 0)
        GL.Color3(Color.White)
        GL.Vertex3(0, 25, 0)
        GL.Color3(Color.Blue)
        GL.Vertex3(0, 0, -50)
        'Face 4
        GL.Color3(Color.Green)
        GL.Vertex3(-50, 0, 0)
        GL.Color3(Color.White)
        GL.Vertex3(0, 25, 0)
        GL.Color3(Color.Blue)
        GL.Vertex3(0, 0, -50)

        'Finish the begin mode with "end"
        GL.End()

        'Finally...
        GraphicsContext.CurrentContext.VSync = True 'Caps frame rate as to not over run GPU
        GlControl1.SwapBuffers() 'Takes from the 'GL' and puts into control
    End Sub

    Private Sub NumericUpDown1_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NumericUpDown1.ValueChanged
        'Must be called to update the control window!
        GlControl1.Invalidate()
    End Sub

    Private Sub NumericUpDown2_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NumericUpDown2.ValueChanged
        'Must be called to update the control window!
        GlControl1.Invalidate()
    End Sub
End Class