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...MyDualFramebufferView _myView;

- (void)viewWillLayoutSubviews
{
	CGRect rc = self.view.bounds;

	GLfloat scale=1;
	if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
	{
		scale = [[UIScreen mainScreen] scale] ;

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GLsizei cxFBO;
GLsizei cyFBO;
GLuint _frameBufferID;
GLuint _colorRenderBuffer;
GLuint _depthRenderBuffer;
GLuint _fboTextureID;

void MyDualFramebufferView::Resize(GLfloat width, GLfloat height, GLfloat scale)
{
	_scale = scale;

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- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
{
	_myView->DrawToBackbuffer(); // this will draw in 2nd FBO

	[((GLKView *) self.view) bindDrawable]; // reset to main framebuffer

	_myView->RenderToMainscreen();

}

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void MyDualFramebufferView::DrawToBackbuffer(IDrawable& drawable)
{
	// use off screen FBO

	glBindFramebuffer(GL_FRAMEBUFFER, _frameBufferID);
	glViewport(0,0, cxFBO, cyFBO);

	glClearColor(0, 0, 0, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

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void MyDualFramebufferView::RenderToMainscreen(IDrawable& drawable)
{
// switch back to main
	glClearColor(1, 0, 0, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	// trigger mipmaps generation explicitly
	glBindTexture(GL_TEXTURE_2D, _fboTextureID);
	glGenerateMipmap(GL_TEXTURE_2D);
	glBindTexture(GL_TEXTURE_2D, 0);

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// Copyright 2014 Michael A. R. Duncan
// You are free to do whatever you want with this source
// 
// File: Galaxy1Compute.compute

// Each #kernel tells which function to compile; you can have many kernels
#pragma kernel UpdateStars

#include "Galaxy.cginc"

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#region Copyright

// Copyright 2014 Michael A. R. Duncan
// You are free to do whatever you want with this source
// File: Galaxy1Controller.cs

#endregion

#region