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dawn-cmake/docs/origin-trial-changes.md
Ben Clayton 177e7bfa5d IntrinsicTable: remove double underscores 
'__' is reserved in C++, and the 'match__' and 'build__' functions are causing OSS-fuzz builds to fail.

Add the change in tint behavior to the OT notes.

Add end to end tests for underscores. While the GLSL and MSL compilers seem to accept leading and double underscores in identifiers, the tint build failure has highlighted we have more work to do here (crbug.com/tint/1319)

Fixed: oss-fuzz:41214
Bug: tint:1292
Bug: tint:1319
Change-Id: I32b7bf4e0cff26e678b788457f90452c2503da50
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/70480
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>
2021-11-22 15:24:16 +00:00

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Tint changes during Origin Trial

Changes for M98

Breaking Changes

  • Taking the address of a vector component is no longer allowed.

New Features

  • The dot() builtin now supports integer vector types.
  • Identifiers can now start with a single leading underscore. tint:1292

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