WTF: Why isn't Metal honoring the default limit for

ErichDonGubler · ErichDonGubler · commit 91c56eed1a4c · 2026-03-20T10:40:00.000-06:00
`max_inter_stage_shader_variables?`
diff --git a/wgpu-hal/src/metal/adapter.rs b/wgpu-hal/src/metal/adapter.rs
@@ -913,7 +913,7 @@ impl super::CapabilitiesQuery {
             {
                 31 // min(32 or 124, 124 / 4)
             } else {
-                15 // min(60, 60 / 4)
+                16 // min(64, 64 / 4)
             },
             // "Maximum threads per threadgroup"
             // https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf#page=6

Original file line number	Diff line number	Diff line change
`@@ -913,7 +913,7 @@ impl super::CapabilitiesQuery {`
`913`	`913`	`{`
`914`	`914`	`31 // min(32 or 124, 124 / 4)`
`915`	`915`	`} else {`
`916`		`- 15 // min(60, 60 / 4)`
	`916`	`+ 16 // min(64, 64 / 4)`
`917`	`917`	`},`
`918`	`918`	`// "Maximum threads per threadgroup"`
`919`	`919`	`// https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf#page=6`