var<private>

var<private> declares a mutable variable in the private address-space.

var<private> is almost identical to var<function>, except that var<private> can only be declared at module-scope (global) and is visible to all functions in the module.

Like var<function>, a var<private> declaration must have an explicit type, an initializer, or both type and initializer:

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var<private> var_with_explicit_type : i32;
var<private> var_with_type_inferred_from_initializer = 42;
var<private> var_with_explicit_type_and_initializer : i32 = 42;

A var<private> with no initializer will be automatically initialized with the zero value for the variable’s type.

The initializer for var<private> must be a constant expression.

Each shader invocation will have a unique instance of a var in private address-space.

Uses of a var<private> will always result in a runtime expression.