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Tint changes during Origin Trial

Changes for M97

Breaking Changes

Deprecated modf() and frexp() builtin overloads that take a pointer second parameter have been removed.
Deprecated texture builtin functions that accepted a read access controlled storage texture have been removed.
Storage textures must now only use the write access control.

Deprecated Features

The ignore() builtin has been replaced with phony-assignment. gpuweb#2127

New Features

any() and all() now support a bool parameter. These simply return the passed argument. tint:1253
Call statements may now include functions that return a value (ignore() is no longer needed).
The interpolate(flat) attribute can now be specified on integral user-defined IO. It will eventually become an error to define integral user-defined IO without this attribute.
Matrix construction from scalar element values is now supported.

Fixes

Swizzling of vec3 types in storage and uniform buffers has been fixed for Metal 1.x. tint:1249
Calling a function that returns an unused value no longer produces an FXC compilation error. tint:1259

Changes for M95

New Features

The size of an array can now be defined using a non-overridable module-scope constant
The num_workgroups builtin is now supported.

Fixes

Hex floats: now correctly errors when the magnitude is non-zero, and the exponent would cause overflow. tint:1150, tint:1166
Identifiers beginning with an underscore are now correctly rejected. tint:1179
abs() fixed for unsigned integers on SPIR-V backend tint:1179