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-rw-r--r--syntax/glsl.vim1
1 files changed, 1 insertions, 0 deletions
diff --git a/syntax/glsl.vim b/syntax/glsl.vim
index eee593f1..34230a91 100644
--- a/syntax/glsl.vim
+++ b/syntax/glsl.vim
@@ -454,6 +454,7 @@ syn keyword glslBuiltinVariable gl_TextureMatrixInverseTranspose
syn keyword glslBuiltinVariable gl_TextureMatrixTranspose
syn keyword glslBuiltinVariable gl_Vertex
syn keyword glslBuiltinVariable gl_VertexID
+syn keyword glslBuiltinVariable gl_VertexIndex
syn keyword glslBuiltinVariable gl_ViewportIndex
syn keyword glslBuiltinVariable gl_WorkGroupID
syn keyword glslBuiltinVariable gl_WorkGroupSize