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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
#if HAVE_OPENTK
using OpenTK.Graphics;
using OpenTK.Graphics.ES20;
#endif
namespace Xamarin.Forms.Controls
{
#if HAVE_OPENTK
public class OpenGLGallery : ContentPage
{
float red, green, blue;
public OpenGLGallery ()
{
var view = new OpenGLView {HasRenderLoop = true};
var toggle = new Switch {IsToggled = true};
var button = new Button {Text = "Display"};
view.HeightRequest = 300;
view.WidthRequest = 300;
view.OnDisplay = r =>{
/*
if (!inited) {
var shader = GL.CreateShader (All.VertexShader);
int length = 0;
GL.ShaderSource (shader, 1, new string [] { "void main() { gl_FragColor = vec4(0.6, 1.0, 0.0, 1.0); }"}, ref length);
GL.CompileShader (shader);
int status = 0;
GL.GetShader (shader, All.CompileStatus, ref status);
if (status == 0) {
GL.DeleteShader (shader);
throw new Exception();
}
inited = true;
}
*/
GL.ClearColor (red, green, blue, 1.0f);
GL.Clear ((ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit));
red += 0.01f;
if (red >= 1.0f)
red -= 1.0f;
green += 0.02f;
if (green >= 1.0f)
green -= 1.0f;
blue += 0.03f;
if (blue >= 1.0f)
blue -= 1.0f;
};
toggle.Toggled += (s, a) => { view.HasRenderLoop = toggle.IsToggled; };
button.Activated += (s, a) => view.Display ();
var stack = new StackLayout {Padding = new Size (20, 20)};
stack.Add (view);
stack.Add (toggle);
stack.Add (button);
Content = stack;
}
}
#endif
}
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