# Tint changes during Origin Trial ## Changes for M102 ### New Features * 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) ### Breaking changes * 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) ### Deprecated Features * The `smoothStep()` builtin has been renamed to `smoothstep()`. [tint:1483](crbug.com/tint/1483) ## Changes for M101 ### New Features * Tint now supports unicode identifiers. [tint:1437](crbug.com/tint/1437) ### Breaking changes * The `isNan()`, `isInf()`, `isFinite()`, and `isNormal()` builtins have been removed. [tint:1312](https://crbug.com/tint/1312) ## Changes for M100 ### Breaking changes * 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. ### New Features * 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) ## Changes for M99 ### Breaking changes Obviously infinite loops (no condition, no break) are now a validation error. ### Deprecated Features The following features have been deprecated and will be removed in M102: * 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) ### New Features * 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) ### Fixes * 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) ## Changes for M98 ### Breaking Changes * 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) ### Deprecated Features * The `isNan()`, `isInf()`, `isFinite()` and `isNormal()` builtins has been deprecated and will be removed in M101. [tint:1312](https://crbug.com/tint/1312) ### New Features * 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) ### Fixes * 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) ## 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](https://github.com/gpuweb/gpuweb/pull/2127) ### New Features * `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. ### Fixes * 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 ## 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](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)