Print requested and supported usages on UnsupportedUsage error (#6007)

* Print requested and supported usages on UnsupportedUsage error

* fmt

* changelog

Author: VladasZ

CHANGELOG.md

@@ -46,6 +46,7 @@ Bottom level categories:
 - Fix profiling with `tracy`. By @waywardmonkeys in [#5988](https://github.com/gfx-rs/wgpu/pull/5988)
 - As a workaround for [issue #4905](https://github.com/gfx-rs/wgpu/issues/4905), `wgpu-core` is undocumented unless `--cfg wgpu_core_doc` feature is enabled. By @kpreid in [#5987](https://github.com/gfx-rs/wgpu/pull/5987)
 - Bump MSRV for `d3d12`/`naga`/`wgpu-core`/`wgpu-hal`/`wgpu-types`' to 1.76. By @wumpf in [#6003](https://github.com/gfx-rs/wgpu/pull/6003)
+- Print requested and supported usages on `UnsupportedUsage` error. By @VladasZ in [#6007](https://github.com/gfx-rs/wgpu/pull/6007)
 
 ## 22.0.0 (2024-07-17)
 

wgpu-core/src/device/global.rs

@@ -2009,7 +2009,10 @@ impl Global {
                 config.composite_alpha_mode = new_alpha_mode;
             }
             if !caps.usage.contains(config.usage) {
-                return Err(E::UnsupportedUsage);
+                return Err(E::UnsupportedUsage {
+                    requested: config.usage,
+                    available: caps.usage,
+                });
             }
             if width == 0 || height == 0 {
                 return Err(E::ZeroArea);

wgpu-core/src/present.rs

@@ -89,8 +89,11 @@ pub enum ConfigureSurfaceError {
         requested: wgt::CompositeAlphaMode,
         available: Vec<wgt::CompositeAlphaMode>,
     },
-    #[error("Requested usage is not supported")]
-    UnsupportedUsage,
+    #[error("Requested usage {requested:?} is not in the list of supported usages: {available:?}")]
+    UnsupportedUsage {
+        requested: hal::TextureUses,
+        available: hal::TextureUses,
+    },
     #[error("Gpu got stuck :(")]
     StuckGpu,
 }