glsl-in: inject samplerCubeArray builtins on use

src/front/glsl/ast.rs

@@ -62,14 +62,26 @@ pub struct Overload {
  pub void: bool,
 }
 
+bitflags::bitflags! {
+ /// Tracks the variations of the builtin already generated, this is needed because some
+ /// builtins overloads can't be generated unless explicitly used, since they might cause
+ /// uneeded capabilities to be requested
+ #[derive(Default)]
+ pub struct BuiltinVariations: u32 {
+ /// Request the standard overloads
+ const STANDARD = 1 << 0;
+ /// Request overloads that use the double type
+ const DOUBLE = 1 << 1;
+ /// Request overloads that use samplerCubeArray(Shadow)
+ const CUBE_TEXTURES_ARRAY = 1 << 2;
+ }
+}
+
 #[derive(Debug, Default)]
 pub struct FunctionDeclaration {
  pub overloads: Vec<Overload>,
- /// Whether or not this function has the name of a builtin.
- pub builtin: bool,
- /// If [`builtin`](Self::builtin) is true, this field indicates whether
- /// this function already has double overloads added or not. Otherwise, it is unused.
- pub double: bool,
+ /// Tracks the builtin overload variations that were already generated
+ pub variations: BuiltinVariations,
 }
 
 #[derive(Debug)]