)]}'
{
  "commit": "4d3af66bbdafda4284a0eefb0d384ccdb77a7080",
  "tree": "92fe0a3a6c07ca428c4048399122eb7c46dc5bcd",
  "parents": [
    "55183e6c3abea273dda5dc09decd6b8540d420f8"
  ],
  "author": {
    "name": "James Price",
    "email": "jrprice@google.com",
    "time": "Mon Feb 27 20:21:03 2023 +0000"
  },
  "committer": {
    "name": "Dawn LUCI CQ",
    "email": "dawn-scoped@luci-project-accounts.iam.gserviceaccount.com",
    "time": "Mon Feb 27 20:21:03 2023 +0000"
  },
  "message": "tint/msl: Preserve trailing vec3 padding\n\nIn order to preserve padding properly for MSL, we need to use its\npacked_vec type for all vec3 types in storage buffers, not just struct\nmembers. This commit includes a complete rewrite of the PackedVec3\ntransform to achieve this. The key details are:\n\n* An internal `__packed_vec3\u003c\u003e` type was added, which corresponds to a\n  `type::Vector` with an additional flag to indicate that it will be\n  emitted as packed vector.\n\n* The `PackedVec3` transform replaces all vec3 types used in\n  host-shareable address spaces with the internal `__packed_vec3`\n  type. This includes vec3 types that appear as the store type of a\n  pointer.\n\n* When used as an array element, these `__packed_vec3` types are\n  wrapped in a struct that contains a single `__packed_vec3`\n  member. This allows us to add an `@align()` attribute that ensures\n  that `array\u003cvec3\u003cT\u003e\u003e` still has the correct array element stride.\n\n* When the `vec3\u003cT\u003e` appears as a struct member in the input program,\n  we apply the `@align()` to that member to ensure that we do not\n  change its offset.\n\n* Matrix types with three rows that are used in memory are replaced\n  with an array of columns, where each column uses a `__packed_vec3`\n  inside an aligned wrapper structure as above.\n\n* Accesses to host-shareable memory that involve any of these types\n  invoke a \"pack\" or \"unpack\" helper function to convert them to the\n  equivalent type that uses `__packed_vec3` or a regular `vec3` as\n  required.\n\n* The `chromium_internal_relaxed_uniform_layout` extension is used to\n  avoid issues where modifying a type in the uniform address space\n  triggers stricter layout validation rules.\n\nBug: tint:1571\nFixed: tint:1837\nChange-Id: Idaf2da2f5bcb2be00c85ec657edfb614186476bb\nReviewed-on: https://dawn-review.googlesource.com/c/dawn/+/121200\nReviewed-by: Ben Clayton \u003cbclayton@google.com\u003e\nCommit-Queue: James Price \u003cjrprice@google.com\u003e\nKokoro: Kokoro \u003cnoreply+kokoro@google.com\u003e\n",
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