metal: implement multisample resolve textures#638
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`new_render_pass_mrt` accepts an optional `resolve_img` slice (per-color-attachment resolve target) but unconditionally panics with `unimplemented!` when any caller passes one. macroquad's MSAA render targets do pass them, so any app with `sample_count > 1` aborts on the first render-target construction. Wire each `resolve_img[i]` to the matching color attachment's `resolveTexture` and flip the store action to `MultisampleResolve`. The non-resolve path is unchanged (`StoreAction = Store`).
This was referenced Jun 13, 2026
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Problem
new_render_pass_mrtaccepts an optionalresolve_imgslice (per-color-attachment resolve target) but unconditionally panics withunimplemented!when any caller passes one. macroquad's MSAA render targets do pass them, so any app withsample_count > 1aborts on the first render-target construction:Fix
Wire each
resolve_img[i]to the matching color attachment'sresolveTextureand flip the store action toMultisampleResolve. The non-resolve path is unchanged (StoreAction = Store).Asserts the resolve slice length matches the color slice — the per-index pairing is implicit in the API and a length mismatch would silently drop or out-of-bounds otherwise.
Tested on
iPhone 17 simulator on iOS 27 beta — a macroquad app with
sample_count: 4(creating MSAA render targets) no longer aborts on first construction.