fix: assign initial metadata

Author: chyyran

librashader/src/lib.rs

@@ -73,6 +73,10 @@ pub mod presets {
     pub use librashader_pack::*;
 
     /// Get full parameter metadata from a shader preset.
+    ///
+    /// The returned initial value for a parameter is the value the preset
+    /// overrides it to, if present, and the `#pragma parameter` default
+    /// otherwise.
     pub fn get_parameter_meta(
         preset: &ShaderPreset,
     ) -> Result<impl Iterator<Item = ShaderParameter>, PreprocessError> {
@@ -83,6 +87,11 @@ pub mod presets {
                 map.insert(key, value);
             }
         }
+        for parameter in &preset.parameters {
+            if let Some(meta) = map.get_mut(&parameter.name) {
+                meta.initial = parameter.value;
+            }
+        }
         Ok(map.into_iter().map(|(_, v)| v))
     }