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

ErichDonGubler · ErichDonGubler · commit dd20883d8e72 · 2026-03-23T17:04:58.000-06:00
`max_inter_stage_shader_variables?`
diff --git a/wgpu-hal/src/metal/adapter.rs b/wgpu-hal/src/metal/adapter.rs
@@ -925,7 +925,7 @@ 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
`@@ -925,7 +925,7 @@ impl super::CapabilitiesQuery {`
`925`	`925`	`{`
`926`	`926`	`31 // min(32 or 124, 124 / 4)`
`927`	`927`	`} else {`
`928`		`- 15 // min(60, 60 / 4)`
	`928`	`+ 16 // min(64, 64 / 4)`
`929`	`929`	`},`
`930`	`930`	`// "Maximum threads per threadgroup"`
`931`	`931`	`// https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf#page=6`