Boolean visualization

[eafurst]

Expressions like select and assert operate on booleans. We can come up with a special visualization mode where false is shown as red, and true is shown as green (or black and white), like RenderDoc does.

[eafurst]

The tool currently will evaluate true to 255 and false to 0 - generally the true pixels will be white and false will be black unless the select clause evaluates based on a specific color channel (i.e. if the original expression was select(c==0, [true], [false]), the true pixels will be red and the false will be black).