- Update to 1.4.0:
* Allow setting the intermediate format for chains, instead of
hardcoding it at 16-bit RGBA; advanced users can use this to
e.g. ask for 8-bit sRGB intermediates, reducing the amount of
memory bandwidth needed at the cost of reduced precision.
Whether this is a good tradeoff or not depends on the exact
chain and your requirements.
* Fix an issue where a (cached) shader program could be used
from multiple threads at a time, causing the uniforms to
contain unpredictable values.
* Make the error printed on check_error() slightly friendlier:
Include the enum if possible, and print it to stderr instead
of stdout.