Force all adapters to report min buffer alignment of 32 (#3262)

CHANGELOG.md

@@ -118,6 +118,7 @@ Additionally `Surface::get_default_config` now returns an Option and returns Non
 - Combine `Surface::get_supported_formats`, `Surface::get_supported_present_modes`, and `Surface::get_supported_alpha_modes` into `Surface::get_capabilities` and `SurfaceCapabilities`. By @cwfitzgerald in [#3157](https://github.com/gfx-rs/wgpu/pull/3157)
 - Make `Surface::get_default_config` return an Option to prevent panics. By @cwfitzgerald in [#3157](https://github.com/gfx-rs/wgpu/pull/3157)
 - Lower the `max_buffer_size` limit value for compatibility with Apple2 and WebGPU compliance. By @jinleili in [#3255](https://github.com/gfx-rs/wgpu/pull/3255)
+- Limits `min_uniform_buffer_offset_alignment` and `min_storage_buffer_offset_alignment` is now always at least 32. By @wumpf [#3262](https://github.com/gfx-rs/wgpu/pull/3262)
 - Dereferencing a buffer view is now marked inline. By @Wumpf in [#3307](https://github.com/gfx-rs/wgpu/pull/3307)
 - The `strict_assert` family of macros was moved to `wgpu-types`. By @i509VCB in [#3051](https://github.com/gfx-rs/wgpu/pull/3051)
 - Add missing `DEPTH_BIAS_CLAMP` and `FULL_DRAW_INDEX_UINT32` downlevel flags. By @teoxoy in [#3316](https://github.com/gfx-rs/wgpu/pull/3316)

wgpu-core/src/instance.rs

@@ -176,7 +176,19 @@ pub struct Adapter<A: hal::Api> {
 }
 
 impl<A: HalApi> Adapter<A> {
-    fn new(raw: hal::ExposedAdapter<A>) -> Self {
+    fn new(mut raw: hal::ExposedAdapter<A>) -> Self {
+        // WebGPU requires this offset alignment as lower bound on all adapters.
+        const MIN_BUFFER_OFFSET_ALIGNMENT_LOWER_BOUND: u32 = 32;
+
+        let limits = &mut raw.capabilities.limits;
+
+        limits.min_uniform_buffer_offset_alignment = limits
+            .min_uniform_buffer_offset_alignment
+            .max(MIN_BUFFER_OFFSET_ALIGNMENT_LOWER_BOUND);
+        limits.min_storage_buffer_offset_alignment = limits
+            .min_storage_buffer_offset_alignment
+            .max(MIN_BUFFER_OFFSET_ALIGNMENT_LOWER_BOUND);
+
         Self {
             raw,
             life_guard: LifeGuard::new("<Adapter>"),