8000 metal: use 256-byte uniform alignment on iOS simulator by benface · Pull Request #636 · not-fl3/miniquad · GitHub
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metal: use 256-byte uniform alignment on iOS simulator #636

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Merged
not-fl3 merged 1 commit into from
Jun 15, 2026
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metal: use 256-byte uniform alignment on iOS simulator #636

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13 changes: 11 additions & 2 deletions src/graphics/metal.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,9 +10,18 @@ use super::*;
// https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf
const MAX_UNIFORM_BUFFER_SIZE: u64 = 4 * 1024 * 1024;
const NUM_INFLIGHT_FRAMES: usize = 3;
#[cfg(any(target_os = "macos", all(target_os = "ios", target_arch = "x86_64")))]
// iOS simulator on Apple Silicon Macs (`target_abi = "sim"`) runs
// iOS arm64 code but issues Metal commands against the host Mac's
// GPU — which validates with the 256-byte rule, not iOS arm64's
// 16-byte. Without breaking the simulator out of the iOS-arm64
// branch below, the first draw fails Metal validation on
// uniform-buffer offset alignment.
#[cfg(any(
target_os = "macos",
all(target_os = "ios", any(target_arch = "x86_64", target_abi = "sim")),
))]
const UNIFORM_BUFFER_ALIGN: u64 = 256;
#[cfg(all(target_os = "ios", not(target_arch = "x86_64")))]
#[cfg(all(target_os = "ios", target_arch = "aarch64", not(target_abi = "sim")))]
const UNIFORM_BUFFER_ALIGN: u64 = 16;

impl From<VertexFormat> for MTLVertexFormat {
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