Fix calculation/validation of layer/mip ranges in create_texture_view (#2955)

Co-authored-by: Connor Fitzgerald <connorwadefitzgerald@gmail.com>

CHANGELOG.md

@@ -113,6 +113,7 @@ the same every time it is rendered, we now warn if it is missing.
 - Validate the number of color attachments in `create_render_pipeline` by @nical in [#2913](https://github.com/gfx-rs/wgpu/pull/2913)
 - Validate against the maximum binding index in `create_bind_group_layout` by @nical in [#2892](https://github.com/gfx-rs/wgpu/pull/2892)
 - Validate that map_async's range is not negative by @nical in [#2938](https://github.com/gfx-rs/wgpu/pull/2938)
+- Fix calculation/validation of layer/mip ranges in create_texture_view by @nical in [#2955](https://github.com/gfx-rs/wgpu/pull/2955)
 - Validate the sample count and mip level in `copy_texture_to_buffer` by @nical in [#2958](https://github.com/gfx-rs/wgpu/pull/2958)
 
 #### DX12

wgpu-core/src/device/mod.rs

@@ -948,18 +948,21 @@ impl<A: HalApi> Device<A> {
             },
         };
 
-        let required_level_count =
-            desc.range.base_mip_level + desc.range.mip_level_count.map_or(1, |count| count.get());
+        let mip_count = desc.range.mip_level_count.map_or(1, |count| count.get());
+        let required_level_count = desc.range.base_mip_level.saturating_add(mip_count);
+
         let required_layer_count = match desc.range.array_layer_count {
-            Some(count) => desc.range.base_array_layer + count.get(),
+            Some(count) => desc.range.base_array_layer.saturating_add(count.get()),
             None => match view_dim {
                 wgt::TextureViewDimension::D1
                 | wgt::TextureViewDimension::D2
                 | wgt::TextureViewDimension::D3 => 1,
                 wgt::TextureViewDimension::Cube => 6,
                 _ => texture.desc.array_layer_count(),
-            },
+            }
+            .max(desc.range.base_array_layer.saturating_add(1)),
         };
+
         let level_end = texture.full_range.mips.end;
         let layer_end = texture.full_range.layers.end;
         if required_level_count > level_end {