Making it easier to work with shaders https://git.yummers.dev/slang.git/atom?h=master 2019-08-06T19:14:52+00:00 2019-08-06T19:14:52+00:00 Tim Foley tfoleyNV@users.noreply.github.com 2019-08-06T19:14:52+00:00 urn:sha1:81ce78d08a7e3fbe74f2fd41c5a258ea4b078245 If the user writes code like this: MyStruct s = (MyStruct) 0; then we will interpret it as if they had written: MyStruct s = {}; That is, the "cast from zero" idiom will be taken as a legacy syntax for default construction (using an empty initializer list). This will be semantically equivalent to zero-initialization for all existing HLSL code (where `struct` fields can't have default initialization expressions defined), and is the easiest option for us to support in Slang (since we already support default-initialization using empty initializer lists). The implementation of this feature is narrowly scoped: * It only targets explicit cast expressions like `(MyStruct) 0` and not "constructor" syntax like `MyStruct(0)` * It only applies when there is a single argument that is exactly an integer literal with a zero value (not a reference to a `static const int` that happens to be zero). This change adds a test case to make sure that the feature works as expected. Because it relies on our existing initializer-list handling, the "cast from zero" idiom should work for any user-defined type where an initializer list would work.