Make ForceShaderModelToken’s functions const.

Author: kpreid

wgpu-hal/src/dx12/shader_compilation.rs

@@ -93,14 +93,14 @@ impl CompilerContainer {
     }
 
     pub(super) fn max_shader_model(&self) -> Option<wgt::DxcShaderModel> {
-        match self {
+        match *self {
             CompilerContainer::Fxc(..) => None,
             CompilerContainer::DynamicDxc(CompilerDynamicDxc {
                 max_shader_model, ..
             })
             | CompilerContainer::StaticDxc(CompilerStaticDxc {
                 max_shader_model, ..
-            }) => Some(max_shader_model.clone()),
+            }) => Some(max_shader_model),
         }
     }
 

wgpu-types/src/backend.rs

@@ -389,13 +389,13 @@ impl ForceShaderModelToken {
     /// # Safety
     /// Do not make use in runtime-compiled shaders of any features that may not be supported by the FXC or DXC
     /// version you use.
-    pub unsafe fn with_shader_model(sm: DxcShaderModel) -> Self {
+    pub const unsafe fn with_shader_model(sm: DxcShaderModel) -> Self {
         Self { inner: Some(sm) }
     }
 
     /// Returns the shader model version, if any, in this token.
-    pub fn get(&self) -> Option<DxcShaderModel> {
-        self.inner.clone()
+    pub const fn get(&self) -> Option<DxcShaderModel> {
+        self.inner
     }
 }
 
@@ -740,7 +740,7 @@ impl Dx12SwapchainKind {
 }
 
 /// DXC shader model.
-#[derive(Clone, Debug)]
+#[derive(Clone, Copy, Debug)]
 #[allow(missing_docs)]
 pub enum DxcShaderModel {
     V6_0,