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Shader get content from screen buffer

edited March 2013 in General Posts: 4

Hi

I am now starting playong with the shaders in codea.
At first i want to try something like the game of life. Therefore i need to get the content from the screen.
I know how to write on the screen in the main function of the fragment:
gl_FragColor = ....
In this function i want to get the content of the screen at first?

Can you please help!

Thank you!

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