Making it easier to work with shaders https://git.yummers.dev/slang.git/atom?h=master 2017-11-20T21:45:10+00:00 2017-11-20T21:45:10+00:00 Tim Foley tfoleyNV@users.noreply.github.com 2017-11-20T21:45:10+00:00 urn:sha1:37315c96ea48045fae60f0e1cb1a3293f3ddd962 The big change here is that the ability to contain basic blocks with instructions in them has been hoisted from `IRFunc` into a new base type `IRGlobalValueWithCode` shared with `IRGlobalVar`. The basic blocks of a global variable define initialization logic for it; they can be looked at like a function that returns the initial value. Places in the IR that used to assume functions contain all the code need to be updated, but so far I only handled the cloning step. The emit logic currently handles an initializer for a global variable by outputting its logic as a separate function, and then having the variable call that function to initialize itself. This should be cleaned up over time so that we generate an ordinary expression whenever possible. I also made the emit logic correctly label any global variable without a layout (that is, any that don't represent a shader parameter) as `static` so that the downstream HLSL compiler sees them as variables rather than parameters.