Add webp support (#33)

* add webp support

* Use unreleased gltf version

* Fix

* Use patch

* Don't enable gltf dependency on webp feature

---------

Co-authored-by: Asger Nyman Christiansen <asgernyman@gmail.com>

Author: marstaik

Cargo.toml

@@ -30,6 +30,7 @@ tiff = ["image/tiff"]
 tga = ["image/tga"]
 gif = ["image/gif"]
 bmp = ["image/bmp"]
+webp = ["image/webp", "gltf?/EXT_texture_webp"]
 
 svg = ["dep:resvg"]
 
@@ -59,3 +60,6 @@ serde = {version= "1", optional = true, features = ["derive", "rc"] }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 web-sys = { version = "0.3", features = ['Document', 'Window'] }
+
+[patch.crates-io]
+gltf = {  git="https://github.com/gltf-rs/gltf", rev="a29fb756fd91913e3b6452036cdbe65a0932ac20" }

src/io/img.rs

@@ -136,6 +136,12 @@ pub fn serialize_img(tex: &Texture2D, path: &Path) -> Result<RawAssets> {
             #[cfg(feature = "gif")]
             ImageFormat::Gif
         }
+        "webp" => {
+            #[cfg(not(feature = "webp"))]
+            return Err(Error::FeatureMissing("webp".to_string()));
+            #[cfg(feature = "webp")]
+            ImageFormat::WebP
+        }
         _ => return Err(Error::FailedSerialize(path.to_str().unwrap().to_string())),
     };
     let img = match &tex.data {
@@ -308,6 +314,13 @@ mod test {
         assert_eq!(tex.height, 512);
     }
 
+    #[cfg(feature = "webp")]
+    #[test]
+    pub fn webp() {
+        test_serialize("webp");
+        test_deserialize("webp");
+    }
+
     #[cfg(feature = "svg")]
     #[test]
     pub fn svg() {