| # Tint changes during Origin Trial |
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| ## Changes for M102 |
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| ### New Features |
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| * Parentheses are no longer required around expressions for if and switch statements [tint:1424](crbug.com/tint/1424) |
| * Compound assignment statements are now supported. [tint:1325](https://crbug.com/tint/1325) |
| * The colon in case statements is now optional. [tint:1485](crbug.com/tint/1485) |
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| ### Breaking changes |
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| * Struct members are now separated by commas. [tint:1475](crbug.com/tint/1475) |
| * The `@block` attribute has been removed. [tint:1324](crbug.com/tint/1324) |
| * The `@stride` attribute has been removed. [tint:1381](crbug.com/tint/1381) |
| * Attributes using `[[attribute]]` syntax are no longer supported. [tint:1382](crbug.com/tint/1382) |
| * The `elseif` keyword is no longer supported. [tint:1289](crbug.com/tint/1289) |
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| ### Deprecated Features |
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| * The `smoothStep()` builtin has been renamed to `smoothstep()`. [tint:1483](crbug.com/tint/1483) |
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| ## Changes for M101 |
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| ### New Features |
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| * Tint now supports unicode identifiers. [tint:1437](crbug.com/tint/1437) |
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| ### Breaking changes |
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| * The `isNan()`, `isInf()`, `isFinite()`, and `isNormal()` builtins have been removed. [tint:1312](https://crbug.com/tint/1312) |
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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) |
| * The `ignore()` intrinsic has been removed. Use phoney-assignment instead: `ignore(expr);` -> `_ = expr;`. |
| * `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) |
| * 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) |
| * Attributes now use the `@decoration` syntax instead of the `[[decoration]]` syntax. [tint:1382](https://crbug.com/tint/1382) |
| * `elseif` has been replaced with `else if`. [tint:1289](https://crbug.com/tint/1289) |
| * 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) |
| * Added builtins `degrees()` and `radians()` for converting between degrees and radians. [tint:1329](https://crbug.com/tint/1329) |
| * `let` arrays and matrices can now be dynamically indexed. [tint:1352](https://crbug.com/tint/1352) |
| * Storage and Uniform buffer types no longer have to be structures. [tint:1372](crbug.com/tint/1372) |
| * 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. |
| * Module-scope declarations can no longer alias a builtin name. [tint:1318](https://crbug.com/tint/1318) |
| * 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) |
| * Shadowing is now fully supported. [tint:819](https://crbug.com/tint/819) |
| * The `dot()` builtin now supports integer vector types. |
| * Identifiers can now start with a single leading underscore. [tint:1292](https://crbug.com/tint/1292) |
| * 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) |
| * 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. |
| * 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. |
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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) |
| * 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. |
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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) |
| * Calling a function that returns an unused value no longer produces an FXC compilation error. [tint:1259](https://crbug.com/tint/1259) |
| * `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 |
| * 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) |
| * Identifiers beginning with an underscore are now correctly rejected. [tint:1179](https://crbug.com/tint/1179) |
