Add builder for TextureDescriptor

wgpu-types/src/into_cow.rs

@@ -0,0 +1,45 @@
+use std::borrow::Cow;
+
+/// Implements conversion into a cow.
+pub trait IntoCow<'c, CowType: ?Sized + ToOwned> {
+    fn into_cow(self) -> Cow<'c, CowType>;
+}
+
+impl<'c, T: Clone> IntoCow<'c, [T]> for &'c [T] {
+    fn into_cow(self) -> Cow<'c, [T]> {
+        Cow::Borrowed(self)
+    }
+}
+
+impl<'c> IntoCow<'c, str> for &'c str {
+    fn into_cow(self) -> Cow<'c, str> {
+        Cow::Borrowed(self)
+    }
+}
+
+impl<T: Clone> IntoCow<'static, [T]> for Vec<T> {
+    fn into_cow(self) -> Cow<'static, [T]> {
+        Cow::Owned(self)
+    }
+}
+
+impl IntoCow<'static, str> for String {
+    fn into_cow(self) -> Cow<'static, str> {
+        Cow::Owned(self)
+    }
+}
+
+macro_rules! into_cow_array {
+    ($($number:literal),*) => {$(
+        impl<'c, T: Clone> IntoCow<'c, [T]> for &'c [T; $number] {
+            fn into_cow(self) -> Cow<'c, [T]> {
+                Cow::Borrowed(&self[..])
+            }
+        }
+    )*};
+}
+
+into_cow_array!(
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
+    26, 27, 28, 29, 30, 31, 32
+);

wgpu-types/src/lib.rs

@@ -12,6 +12,9 @@
 use serde::{Deserialize, Serialize};
 use std::{borrow::Cow, num::NonZeroU32, ops::Range};
 
+pub use into_cow::IntoCow;
+mod into_cow;
+
 /// Integral type used for buffer offsets.
 pub type BufferAddress = u64;
 /// Integral type used for buffer slice sizes.
@@ -1305,6 +1308,42 @@ impl<L> TextureDescriptor<L> {
     }
 }
 
+/// Texture descriptor builder methods
+impl<'a> TextureDescriptor<Option<Cow<'a, str>>> {
+    pub fn new(
+        size: Extent3d,
+        dimension: TextureDimension,
+        format: TextureFormat,
+        usage: TextureUsage,
+    ) -> Self {
+        Self {
+            label: None,
+            size,
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension,
+            format,
+            usage,
+        }
+    }
+
+    pub fn label<L>(&mut self, label: impl IntoCow<'a, str>) -> &mut Self {
+        self.label = Some(label.into_cow());
+        self
+    }
+
+    pub fn mip_level_count(&mut self, count: u32) -> &mut Self {
+        // TODO: validate this size is sane
+        self.mip_level_count = count;
+        self
+    }
+
+    pub fn sample_count(&mut self, count: u32) -> &mut Self {
+        self.sample_count = count;
+        self
+    }
+}
+
 /// Kind of data the texture holds.
 #[repr(C)]
 #[derive(Copy, Clone, Debug, Hash, Eq, PartialEq)]