Fixes:
* Values exceeding the encoded range.
Future may account for a certain range
above and below current values.
* Minor calculation problem that prevented
the above fix from working properly.
* Streamlined the shader code.
* Add a vertex shader to handle the scaling.
* Use the viewport resolution as the scaled
version to save performance.
Remove the sum, add some commments, and
make it scale to the full window.
TODO:
* Hook up CM.
* Add UI for intensity
* Add lines at 20% increments, plus under /
overshoot?
* Add UI for increments.