[glsl-in] Add glsl-validate and sampling qualifier

src/front/glsl/ast.rs

@@ -163,6 +163,7 @@ impl<'a> Program<'a> {
         )
     }
 
+    #[allow(dead_code)] // FIXME: Remove after implementing structs
     pub fn type_size(&self, ty: Handle<Type>) -> Result<u8, ErrorKind> {
         Ok(match self.module.types[ty].inner {
             crate::TypeInner::Scalar { width, .. } => width,
@@ -310,11 +311,6 @@ impl<'function> Context<'function> {
         }
     }
 
-    pub fn clear_scopes(&mut self) {
-        self.scopes.clear();
-        self.scopes.push(FastHashMap::default());
-    }
-
     /// Add variable to current scope
     pub fn add_local_var(&mut self, name: String, expr: Handle<Expression>) {
         if let Some(current) = self.scopes.last_mut() {

src/front/glsl/mod.rs

@@ -5,8 +5,6 @@ use crate::{FastHashMap, Module, ShaderStage};
 
 mod lex;
 
-// TODO: Remove later
-#[allow(dead_code)]
 mod ast;
 use ast::Program;
 

src/front/glsl/parser.rs

@@ -163,6 +163,7 @@ impl<'source, 'program, 'options> Parser<'source, 'program, 'options> {
     fn peek_type_qualifier(&mut self) -> bool {
         self.lexer.peek().map_or(false, |t| match t.value {
             TokenValue::Interpolation(_)
+            | TokenValue::Sampling(_)
             | TokenValue::Const
             | TokenValue::In
             | TokenValue::Out
@@ -192,6 +193,7 @@ impl<'source, 'program, 'options> Parser<'source, 'program, 'options> {
                 TokenValue::Uniform => TypeQualifier::StorageQualifier(
                     StorageQualifier::StorageClass(StorageClass::Uniform),
                 ),
+                TokenValue::Sampling(s) => TypeQualifier::Sampling(s),
 
                 _ => unreachable!(),
             })

src/front/glsl/variables.rs

@@ -346,6 +346,11 @@ impl Program<'_> {
         name: String,
         init: Option<Handle<Constant>>,
     ) -> Result<Handle<Expression>, ErrorKind> {
+        #[cfg(feature = "glsl-validate")]
+        if ctx.lookup_local_var_current_scope(&name).is_some() {
+            return Err(ErrorKind::VariableAlreadyDeclared(name));
+        }
+
         // FIXME: this should be removed after
         // fixing the lack of constant qualifier support
         #[allow(clippy::never_loop)]