Document WebGPU subgroup-size-control capability - #1145
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Important
Draft — do not merge until Engine 2.22 is released. The
device.supportsSubgroupSizeControlcapability, theCAPS_SUBGROUP_SIZE_CONTROLdefine, and the publicdevice.minSubgroupSize/device.maxSubgroupSizeproperties ship in Engine 2.22 (playcanvas/engine#9158, merged tomain). Mark ready for review once 2.22 is out.Documents the WebGPU
subgroup-size-controlfeature (new in Chrome 151/152) on the WGSL Capabilities page.Changes:
device.supportsSubgroupSizeControlentry to the WGSL language extensions list, following the author-written-directive pattern (likesupportsStorageTextureRead): the engine advertises the capability but does not inject theenableline.#ifdef CAPS_SUBGROUP_SIZE_CONTROLguard, the author-writtenenable subgroup_size_control;, and the@subgroup_size(N)attribute.enable-directive ordering (all directives must precede declarations; place the author-writtenenableat the top of the chunk).device.minSubgroupSize/device.maxSubgroupSizebounds (previously undocumented) as the valid range for the pinned size.