From e610c71f13231a124d14a2289de4dbc1b3eb722e Mon Sep 17 00:00:00 2001
From: Ishi Tatsuyuki <ishitatsuyuki@gmail.com>
Date: Sat, 12 Jun 2021 15:28:30 +0900
Subject: [PATCH] Adjust metal workgroup limits

---
 piet-gpu-hal/src/metal.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/piet-gpu-hal/src/metal.rs b/piet-gpu-hal/src/metal.rs
index 69141c2..b8a1bf9 100644
--- a/piet-gpu-hal/src/metal.rs
+++ b/piet-gpu-hal/src/metal.rs
@@ -164,9 +164,12 @@ impl MtlInstance {
                 has_descriptor_indexing: false,
                 has_subgroups: false,
                 subgroup_size: None,
+                // The workgroup limits are taken from the minimum of a desktop installation;
+                // we don't support iOS right now, but in case of testing on those devices it might
+                // need to change these (or just queried properly).
                 workgroup_limits: WorkgroupLimits {
-                    max_size: [512, 512, 512],
-                    max_invocations: 512,
+                    max_size: [1024, 1024, 64],
+                    max_invocations: 1024,
                 },
                 has_memory_model: false,
                 use_staging_buffers,