[shader-ast] Bitwise shift operation

[sylee957]

I can't find bitwise shift operators >>, << in shader-ast.
Is it not implemented yet?
I'm trying the workaround

export const lshift = <T extends "int" | "uint" | IVec | UVec>(
  a: Term<T>,
  b: IntTerm | UintTerm
) => op2("<<", a, b) as Op2<T>;
export const rshift = <T extends "int" | "uint" | IVec | UVec>(
  a: Term<T>,
  b: IntTerm | UintTerm
) => op2(">>", a, b) as Op2<T>;

[postspectacular]

I'm really surprised these weren't included yet, I will have to add a few more variations (function overrides) for these, but in general, yes, the above is the correct approach...

[postspectacular]

The 2 relevant commits, just for reference:

a986766

a78d313

[sylee957]

Unfortunately, I still see some problems for types if one operand is signed and the other operand is unsigned

I found this from specification:

One operand can be signed while the other is unsigned.

const a = sym("int");
const b = sym("uint");
lshift(a, b);

const a = sym("uint");
const b = sym("int");
lshift(a, b);

And I think that same applies for vectors, such as

const a = sym("uvec2");
const b = sym("int");
lshift(a, b);

const a = sym("uvec2");
const b = sym("ivec2");
lshift(a, b);