Patch_2

leenkx/blender/lnx/material/shader.py

@@ -361,9 +361,14 @@ class Shader:
     def write_header(self, s):
         self.header += s + '\n'
 
-    def write_attrib(self, s):
+    def write_attrib(self, s, unique=False):
+        if unique and s in self.main_attribs:
+            return
         self.main_attribs += '\t' + s + '\n'
 
+    def has_attrib(self, s):
+        return s in self.main_attribs
+
     def is_equal(self, sh):
         self.vstruct_to_vsin()
         return self.ins == sh.ins and \
@@ -394,6 +399,25 @@ class Shader:
         for e in vs:
             self.add_in('vec' + self.data_size(e['data']) + ' ' + e['name'])
 
+    def validate(self):
+        import re
+        issues = []
+        
+        # Check for duplicate variable declarations in main_attribs
+        var_pattern = re.compile(r'\b(vec[234]|float|int|mat[234])\s+(\w+)\s*[;=]')
+        declared_vars = {}
+        
+        for line in self.main_attribs.split('\n'):
+            match = var_pattern.search(line)
+            if match:
+                var_type, var_name = match.groups()
+                if var_name in declared_vars:
+                    issues.append(f"Duplicate variable declaration: '{var_name}' (type: {var_type})")
+                else:
+                    declared_vars[var_name] = var_type
+        
+        return issues
+
     def get(self):
         if self.noprocessing:
             return self.main