Unsigned integers in GLSL were being parsed using the regular integer parser, so it was limited to INT_MAX. All values from INT_MAX + 1 to UINT_MAX could not be parsed properly. Also, added constant folding for the 4 bit conversion glsl functions. Fixes shader compilation issue in the Epic Zen Garden example: https://s3.amazonaws.com/mozilla-games/ZenGarden/EpicZenGarden.html (unfortunately, the screen is still black, so there are other issues left) Fixes WebGL 2 test: conformance2/glsl3/float-parsing.html Change-Id: Iae52b2c8e083f0e1a22599e5a583297b9850444d Reviewed-on: https://swiftshader-review.googlesource.com/16648Tested-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com>
