public static void Main(string[] args)
{
using (var win = new GameWindow(1280, 720, GraphicsMode.Default, "OpenTK Intro",
GameWindowFlags.Default, DisplayDevice.Default,
// ask for an OpenGL 3.0 forward compatible context
3, 0, GraphicsContextFlags.ForwardCompatible))
{
VertexBuffer <ColouredVertex> vertexBuffer = null;
ShaderProgram shaderProgram = null;
VertexArray <ColouredVertex> vertexArray = null;
Matrix4Uniform projectionMatrix = null;
win.Load += (s, e) =>
{
var vertexShader = new Shader(ShaderType.VertexShader,
File.ReadAllText(@"../../VertexShaders/vertex-shader.vs"));
var fragmentShader = new Shader(ShaderType.FragmentShader,
File.ReadAllText(@"../../FragmentShaders/fragment-shader.fs"));
// link shaders into shader program
shaderProgram = new ShaderProgram(vertexShader, fragmentShader);
// create projection matrix uniform
projectionMatrix = new Matrix4Uniform("projectionMatrix")
{
Matrix = Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver2, 16f / 9, 0.1f, 100f)
};
};
win.Unload += (s, e) => { /* dispose global GL resources here */ };
win.RenderFrame += (s, e) =>
{
GL.ClearColor(128, 0, 1, 256);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
//http://genericgamedev.com/tutorials/opengl-in-csharp-an-object-oriented-introduction-to-opentk/4/
// activate shader program and set uniforms
shaderProgram.Use();
projectionMatrix.Set(shaderProgram);
// bind vertex buffer and array objects
vertexBuffer.Bind();
vertexArray.Bind();
// upload vertices to GPU and draw them
vertexBuffer.BufferData();
vertexBuffer.Draw();
// reset state for potential further draw calls (optional, but good practice)
GL.BindVertexArray(0);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.UseProgram(0);
// swap backbuffer
win.SwapBuffers();
};
win.Resize += (s, e) =>
{
GL.Viewport(0, 0, win.Width, win.Height);
};
long updateCount = 0;
var random = new Random();
var tetrahedron = new RegularTetrahedron();
win.UpdateFrame += (s, e) =>
{
var keyboardState = win.Keyboard.GetState();
// create and fill a vertex buffer
vertexBuffer = new VertexBuffer <ColouredVertex>(ColouredVertex.Size);
//foreach (var i in Enumerable.Range(0, random.Next(100, 1000)))
//{
// vertexBuffer.AddVertex(new ColouredVertex(new Vector3(-1f * (0.01f * updateCount), -1, -i), Color4.Lime));
// vertexBuffer.AddVertex(new ColouredVertex(new Vector3(1, 1, -i), Color4.Red));
// vertexBuffer.AddVertex(new ColouredVertex(new Vector3(1f * (0.01f * updateCount), -1, -i), Color4.Blue));
//}
tetrahedron.Draw(vertexBuffer);
// create vertex array to specify vertex layout
vertexArray = new VertexArray <ColouredVertex>(
vertexBuffer, shaderProgram,
new VertexAttribute("vPosition", 3, VertexAttribPointerType.Float, ColouredVertex.Size, 0),
new VertexAttribute("vColor", 4, VertexAttribPointerType.Float, ColouredVertex.Size, 12)
);
++updateCount;
};
win.Run();
}
}