104 lines
5.3 KiB
Markdown
104 lines
5.3 KiB
Markdown
# Tint changes during Origin Trial
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## Changes for M100
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### Breaking changes
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* The `@interpolate(flat)` attribute must now be specified on integral user-defined IO. [tint:1224](crbug.com/tint/1224)
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* The `ignore()` intrinsic has been removed. Use phoney-assignment instead: `ignore(expr);` -> `_ = expr;`.
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* `break` statements in `continuing` blocks are now correctly validated.
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### New Features
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* Module-scope declarations can now be declared in any order. [tint:1266](crbug.com/tint/1266)
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* The `override` keyword and `@id()` attribute for pipeline-overridable constants are now supported, replacing the `@override` attribute. [tint:1403](crbug.com/tint/1403)
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## Changes for M99
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### Breaking changes
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Obviously infinite loops (no condition, no break) are now a validation error.
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### Deprecated Features
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The following features have been deprecated and will be removed in M102:
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* The `[[block]]` attribute has been deprecated. [tint:1324](https://crbug.com/tint/1324)
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* Attributes now use the `@decoration` syntax instead of the `[[decoration]]` syntax. [tint:1382](https://crbug.com/tint/1382)
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* `elseif` has been replaced with `else if`. [tint:1289](https://crbug.com/tint/1289)
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* The `[[stride]]` attribute has been deprecated. [tint:1381](https://crbug.com/tint/1381)
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### New Features
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* Vector and matrix element type can now be inferred from constructor argument types. [tint:1334](https://crbug.com/tint/1334)
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* Added builtins `degrees()` and `radians()` for converting between degrees and radians. [tint:1329](https://crbug.com/tint/1329)
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* `let` arrays and matrices can now be dynamically indexed. [tint:1352](https://crbug.com/tint/1352)
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* Storage and Uniform buffer types no longer have to be structures. [tint:1372](crbug.com/tint/1372)
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* A struct declaration does not have to be followed by a semicolon. [tint:1380](crbug.com/tint/1380)
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### Fixes
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* Fixed an issue where for-loops that contain array or structure constructors in the loop initializer statements, condition expressions or continuing statements could fail to compile. [tint:1364](https://crbug.com/tint/1364)
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## Changes for M98
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### Breaking Changes
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* Taking the address of a vector component is no longer allowed.
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* Module-scope declarations can no longer alias a builtin name. [tint:1318](https://crbug.com/tint/1318)
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* It is now an error to call a function either directly or transitively, from a loop continuing block, that uses `discard`. [tint:1302](https://crbug.com/tint/1302)
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### Deprecated Features
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* The `isNan()`, `isInf()`, `isFinite()` and `isNormal()` builtins has been deprecated and will be removed in M101. [tint:1312](https://crbug.com/tint/1312)
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### New Features
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* New texture gather builtins: `textureGather()` and `textureGatherCompare()`. [tint:1330](https://crbug.com/tint/1330)
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* Shadowing is now fully supported. [tint:819](https://crbug.com/tint/819)
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* The `dot()` builtin now supports integer vector types.
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* Identifiers can now start with a single leading underscore. [tint:1292](https://crbug.com/tint/1292)
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* Control flow analysis has been improved, and functions no longer need to `return` if the statement is unreachable. [tint:1302](https://crbug.com/tint/1302)
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* Unreachable statements now produce a warning instead of an error, to allow WGSL code to be updated to the new analysis behavior. These warnings may become errors in the future [gpuweb#2378](https://github.com/gpuweb/gpuweb/issues/2378)
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### Fixes
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* Fixed an issue where using a module-scoped `let` in a `workgroup_size` may result in a compilation error. [tint:1320](https://crbug.com/tint/1320)
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## Changes for M97
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### Breaking Changes
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* Deprecated `modf()` and `frexp()` builtin overloads that take a pointer second parameter have been removed.
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* Deprecated texture builtin functions that accepted a `read` access controlled storage texture have been removed.
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* Storage textures must now only use the `write` access control.
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### Deprecated Features
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* The `ignore()` builtin has been replaced with phony-assignment. [gpuweb#2127](https://github.com/gpuweb/gpuweb/pull/2127)
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### New Features
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* `any()` and `all()` now support a `bool` parameter. These simply return the passed argument. [tint:1253](https://crbug.com/tint/1253)
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* Call statements may now include functions that return a value (`ignore()` is no longer needed).
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* 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.
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* Matrix construction from scalar element values is now supported.
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### Fixes
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* Swizzling of `vec3` types in `storage` and `uniform` buffers has been fixed for Metal 1.x. [tint:1249](https://crbug.com/tint/1249)
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* Calling a function that returns an unused value no longer produces an FXC compilation error. [tint:1259](https://crbug.com/tint/1259)
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* `abs()` fixed for unsigned integers on SPIR-V backend
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## Changes for M95
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### New Features
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* The size of an array can now be defined using a non-overridable module-scope constant
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* The `num_workgroups` builtin is now supported.
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### Fixes
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* Hex floats: now correctly errors when the magnitude is non-zero, and the exponent would cause overflow. [tint:1150](https://crbug.com/tint/1150), [tint:1166](https://crbug.com/tint/1166)
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* Identifiers beginning with an underscore are now correctly rejected. [tint:1179](https://crbug.com/tint/1179)
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