sdk: Add decompiled SJSON texture file

In addition to the actual image file, also write a `.texture` engine
file.

lib/sdk/src/filetype/texture.rs

@@ -6,7 +6,7 @@ use color_eyre::eyre::Context;
 use color_eyre::{eyre, SectionExt};
 use color_eyre::{Help, Result};
 use oodle::{OodleLZ_CheckCRC, OodleLZ_FuzzSafe};
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 use tokio::fs;
 
 use crate::binary::sync::{ReadExt, WriteExt};
@@ -14,6 +14,30 @@ use crate::bundle::file::UserFile;
 use crate::murmur::{HashGroup, IdString32, IdString64};
 use crate::{BundleFile, BundleFileType, BundleFileVariant};
 
+#[derive(Clone, Debug, Deserialize, Serialize)]
+struct TextureDefinition {
+    common: TextureDefinitionPlatform,
+    // Stingray supports per-platform sections here, where you can create overrides with the same
+    // values as in `common`. But since we only support PC, we don't need to implement
+    // that.
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
+struct TextureDefinitionPlatform {
+    input: TextureDefinitionInput,
+    output: TextureDefinitionOutput,
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
+struct TextureDefinitionInput {
+    filename: String,
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
+struct TextureDefinitionOutput {
+    category: String,
+}
+
 bitflags! {
     #[derive(Clone, Copy, Debug)]
     struct TextureFlags: u32 {
@@ -227,8 +251,21 @@ impl Texture {
     }
 
     #[tracing::instrument]
-    fn to_user_files(&self, name: String) -> Vec<UserFile> {
-        let mut files = Vec::with_capacity(2);
+    fn to_sjson(&self, filename: String) -> Result<String> {
+        let texture = TextureDefinition {
+            common: TextureDefinitionPlatform {
+                input: TextureDefinitionInput { filename },
+                output: TextureDefinitionOutput {
+                    category: self.category.display().to_string(),
+                },
+            },
+        };
+        serde_sjson::to_string(&texture).wrap_err("Failed to serialize texture definition")
+    }
+
+    #[tracing::instrument]
+    fn to_user_files(&self, name: String) -> Result<Vec<UserFile>> {
+        let mut files = Vec::with_capacity(3);
 
         // TODO: Don't clone.
 
@@ -240,33 +277,18 @@ impl Texture {
             ));
         }
 
-        files.push(UserFile::with_name(self.data.clone(), name));
-        files
+        {
+            let data = self.to_sjson(name.clone())?.as_bytes().to_vec();
+            let name = PathBuf::from(&name)
+                .with_extension("texture")
+                .display()
+                .to_string();
+            files.push(UserFile::with_name(data, name));
         }
-}
 
-#[derive(Clone, Debug, Deserialize)]
-struct TextureDefinition {
-    common: TextureDefinitionPlatform,
-    // Stingray supports per-platform sections here, where you can create overrides with the same
-    // values as in `common`. But since we only support PC, we don't need to implement
-    // that.
-}
-
-#[derive(Clone, Debug, Deserialize)]
-struct TextureDefinitionPlatform {
-    input: TextureDefinitionInput,
-    output: TextureDefinitionOutput,
-}
-
-#[derive(Clone, Debug, Deserialize)]
-struct TextureDefinitionInput {
-    filename: String,
-}
-
-#[derive(Clone, Debug, Deserialize)]
-struct TextureDefinitionOutput {
-    category: String,
+        files.push(UserFile::with_name(self.data.clone(), name));
+        Ok(files)
+    }
 }
 
 #[tracing::instrument(skip(ctx, data), fields(buf_len = data.as_ref().len()))]
@@ -287,8 +309,9 @@ pub(crate) async fn decompile_data(
     };
 
     let texture = Texture::from_binary(ctx, &mut r, stream_r.as_mut())?;
-    let files = texture.to_user_files(name);
-    Ok(files)
+    texture
+        .to_user_files(name)
+        .wrap_err("Failed to build user files")
 }
 
 #[tracing::instrument(skip(ctx))]