[BUG] - window resize blows away buffers

[halvves]

Describe the bug
When the window gets resized, buffers end up as empty textures.

To Reproduce
Steps to reproduce the behavior:

1. visit http://cdpn.io/e/GRMBaYR
2. resize the window
3. see that game of life state end up empty

Expected behavior
I am somewhat unsure since the textures size is changing, but at the very least we shouldn't completely lose previous data.

Desktop (please complete the following information):

• OS: any/all
• Browser any/all
• Version v1.0.0-alpha.20

Smartphone (please complete the following information):

• Device: any/all
• OS: any/all
• Browser any/all
• Version v1.0.0-alpha.20