diff --git a/pygments/lexers/graphics.py b/pygments/lexers/graphics.py
index 95e56d0c66..53ee9c8188 100644
--- a/pygments/lexers/graphics.py
+++ b/pygments/lexers/graphics.py
@@ -30,7 +30,7 @@ class GLShaderLexer(RegexLexer):
 
     tokens = {
         'root': [
-            (r'^#.*$', Comment.Preproc),
+            (r'^#(?:.*\\\r?\n)*.*$', Comment.Preproc),
             (r'//.*$', Comment.Single),
             (r'/(\\\n)?[*](.|\n)*?[*](\\\n)?/', Comment.Multiline),
             (r'\+|-|~|!=?|\*|/|%|<<|>>|<=?|>=?|==?|&&?|\^|\|\|?',
@@ -161,7 +161,7 @@ class HLSLShaderLexer(RegexLexer):
 
     tokens = {
         'root': [
-            (r'^#.*$', Comment.Preproc),
+            (r'^#(?:.*\\\r?\n)*.*$', Comment.Preproc),
             (r'//.*$', Comment.Single),
             (r'/(\\\n)?[*](.|\n)*?[*](\\\n)?/', Comment.Multiline),
             (r'\+|-|~|!=?|\*|/|%|<<|>>|<=?|>=?|==?|&&?|\^|\|\|?',