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dawn-cmake/docs/origin-trial-changes.md

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Allow array size to be a module-scope constant Change ast::Array to use an ast::Expression for its `size` field. The WGSL frontend now parses the array size as an `primary_expression`, and the Resolver is responsible for validating the expression is a signed or unsigned integer, and either a literal or a non-overridable module-scope constant. The Resolver evaluates the constant value of the size expression, and so the resolved sem::Array type still has a constant size as before. Fixed: tint:1068 Fixed: tint:1117 Change-Id: Icfa141482ea1e47ea8c21a25e9eb48221f176e9a Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/63061 Auto-Submit: James Price <jrprice@google.com> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: James Price <jrprice@google.com> Reviewed-by: Ben Clayton <bclayton@google.com>
2021-09-02 13:49:59 +00:00
# Tint changes during Origin Trial
## Changes for M95
### New Features
* The size of an array can now be defined using a non-overridable module-scope constant
Implement and test num_workgroups for all backends For HLSL, use the new NumWorkgroupsFromUniform transform, and expose the binding point to use for the generated uniform as a backend option. The MSL mapping is trivial, and it was already implemented for WGSL and SPIR-V. Bug: tint:752 Change-Id: I4bd37b5d26181629d72b152fe064a60caf8ecdc5 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/63962 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Ben Clayton <bclayton@google.com>
2021-09-13 17:11:58 +00:00
* The `num_workgroups` builtin is now supported.
wgsl-reader: hex float: zero mantissa results in zero result When the magnitude is zero, then we don't care about the magnitude of the exponent. The result value is always zero, without emitting an error. Fixed: tint:1166 Change-Id: I303d7c336e7ea42719571854f0a22cbfd19da32c Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/63520 Kokoro: Kokoro <noreply+kokoro@google.com> Auto-Submit: David Neto <dneto@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com> Commit-Queue: Antonio Maiorano <amaiorano@google.com>
2021-09-08 13:46:51 +00:00
### Fixes
* Hex floats: issue an error when the magnitude is non-zero, and the exponent would cause
overflow. https://crbug.com/tint/1150 https://crbug.com/tint/1166
wgsl-reader: reject identifiers starting with underscrore Update one test to avoid this error. Fixed: tint:1179 Change-Id: Id41b0eb0f404648de4e86a835fe43f1729cb4696 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/64464 Auto-Submit: David Neto <dneto@google.com> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: David Neto <dneto@google.com> Reviewed-by: Ben Clayton <bclayton@google.com>
2021-09-20 14:38:45 +00:00
* Reject identifiers beginning with an underscore. https://crbug.com/tint/1179
wgsl-reader: hex float: zero mantissa results in zero result When the magnitude is zero, then we don't care about the magnitude of the exponent. The result value is always zero, without emitting an error. Fixed: tint:1166 Change-Id: I303d7c336e7ea42719571854f0a22cbfd19da32c Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/63520 Kokoro: Kokoro <noreply+kokoro@google.com> Auto-Submit: David Neto <dneto@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com> Commit-Queue: Antonio Maiorano <amaiorano@google.com>
2021-09-08 13:46:51 +00:00