private static void NativeWindow_Render(object sender, NativeWindowEventArgs e)
{
NativeWindow nativeWindow = (NativeWindow)sender;
Gl.Viewport(0, 0, (int)nativeWindow.Width, (int)nativeWindow.Height);
Gl.Clear(ClearBufferMask.ColorBufferBit);
Gl.UseProgram(_CubeEdgeProgram);
// Compute MVP
PerspectiveProjectionMatrix proj = new PerspectiveProjectionMatrix(60.0f, (float)nativeWindow.Width / nativeWindow.Height, 0.5f, 1e6f);
ModelMatrix view = new ModelMatrix();
ModelMatrix model = new ModelMatrix();
model.RotateY(_Angle);
model.RotateZ(_Angle);
view.LookAtTarget(Vertex3f.One * 7.0f, Vertex3f.Zero, Vertex3f.UnitY);
Gl.BindVertexArray(_CubeVao);
Gl.UniformMatrix4(_CubeEdgeProgram_Location_uMVP, false, (proj * view * model).ToArray());
foreach (float scale4d in new float[] { 64.0f, 32.0f, 16.0f, 8.0f, 4.0f, 2.0f, 1.0f, 0.5f, 0.25f, 0.125f })
{
Gl.Uniform1(_CubeEdgeProgram_Location_uScale4D, scale4d * _Zooom);
Gl.Uniform4(_CubeEdgeProgram_Location_uColor, 0.0f, 0.3f, 1.0f, Math.Min(1.0f, scale4d * _Zooom / 2.0f));
Gl.DrawElements(PrimitiveType.Lines, _CubeEdges.Length, DrawElementsType.UnsignedShort, IntPtr.Zero);
}
_Angle += 360.0f / (25.0f * 5);
_Zooom -= 0.025f;
if (_Zooom < 0.5f)
{
_Zooom = 1.0f;
}
// Save PNG frame
if (_FrameNo < 125)
{
using (Bitmap bitmap = new Bitmap((int)nativeWindow.Width, (int)nativeWindow.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb)) {
BitmapData bitmapData = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size), ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Gl.ReadPixels(0, 0, (int)nativeWindow.Width, (int)nativeWindow.Height, OpenGL.PixelFormat.Bgr, PixelType.UnsignedByte, bitmapData.Scan0);
bitmap.Save(String.Format("Frame_{0:D3}.png", _FrameNo++));
}
}
}