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-rw-r--r--pygments/lexers/graphics.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/pygments/lexers/graphics.py b/pygments/lexers/graphics.py
index 468f740c..c7aa7df4 100644
--- a/pygments/lexers/graphics.py
+++ b/pygments/lexers/graphics.py
@@ -140,6 +140,8 @@ class GLShaderLexer(RegexLexer):
'namespace', 'using'),
prefix=r'\b', suffix=r'\b'),
Keyword.Reserved),
+ # All names beginning with "gl_" are reserved.
+ (r'gl_\w*', Name.Builtin),
(r'[a-zA-Z_]\w*', Name),
(r'\.', Punctuation),
(r'\s+', Text),