# File lib/rouge/lexers/glsl.rb, line 90
      def self.builtins
        @builtins ||= Set.new %w(
          gl_VertexID gl_InstanceID gl_PerVertex gl_Position gl_PointSize gl_ClipDistance
          gl_PrimitiveIDIn gl_InvocationID gl_PrimitiveID gl_Layer gl_ViewportIndex
          gl_MaxPatchVertices gl_PatchVerticesIn gl_TessLevelOuter gl_TessLevelInner
          gl_TessCoord gl_FragCoord gl_FrontFacing gl_PointCoord gl_SampleID gl_SamplePosition
          gl_FragColor gl_FragData gl_MaxDrawBuffers gl_FragDepth gl_SampleMask
          gl_ClipVertex gl_FrontColor gl_BackColor gl_FrontSecondaryColor gl_BackSecondaryColor
          gl_TexCoord gl_FogFragCoord gl_Color gl_SecondaryColor gl_Normal gl_VertexID
          gl_MultiTexCord0 gl_MultiTexCord1 gl_MultiTexCord2 gl_MultiTexCord3
          gl_MultiTexCord4 gl_MultiTexCord5 gl_MultiTexCord6 gl_MultiTexCord7
          gl_FogCoord gl_MaxVertexAttribs gl_MaxVertexUniformComponents 
          gl_MaxVaryingFloats gl_MaxVaryingComponents gl_MaxVertexOutputComponents
          gl_MaxGeometryInputComponents gl_MaxGeometryOutputComponents
          gl_MaxFragmentInputComponents gl_MaxVertexTextureImageUnits
          gl_MaxCombinedTextureImageUnits gl_MaxTextureImageUnits
          gl_MaxFragmentUniformComponents gl_MaxClipDistances
          gl_MaxGeometryTextureImageUnits gl_MaxGeometryUniformComponents
          gl_MaxGeometryVaryingComponents gl_MaxTessControlInputComponents
          gl_MaxTessControlOutputComponents gl_MaxTessControlTextureImageUnits
          gl_MaxTessControlUniformComponents gl_MaxTessControlTotalOutputComponents
          gl_MaxTessEvaluationInputComponents gl_MaxTessEvaluationOutputComponents
          gl_MaxTessEvaluationTextureImageUnits gl_MaxTessEvaluationUniformComponents
          gl_MaxTessPatchComponents gl_MaxTessGenLevel gl_MaxViewports
          gl_MaxVertexUniformVectors gl_MaxFragmentUniformVectors gl_MaxVaryingVectors
          gl_MaxTextureUnits gl_MaxTextureCoords gl_MaxClipPlanes gl_DepthRange
          gl_DepthRangeParameters gl_ModelViewMatrix gl_ProjectionMatrix
          gl_ModelViewProjectionMatrix gl_TextureMatrix gl_NormalMatrix
          gl_ModelViewMatrixInverse gl_ProjectionMatrixInverse gl_ModelViewProjectionMatrixInverse
          gl_TextureMatrixInverse gl_ModelViewMatrixTranspose
          gl_ModelViewProjectionMatrixTranspose gl_TextureMatrixTranspose
          gl_ModelViewMatrixInverseTranspose gl_ProjectionMatrixInverseTranspose
          gl_ModelViewProjectionMatrixInverseTranspose
          gl_TextureMatrixInverseTranspose gl_NormalScale gl_ClipPlane gl_PointParameters
          gl_Point gl_MaterialParameters gl_FrontMaterial gl_BackMaterial
          gl_LightSourceParameters gl_LightSource gl_MaxLights gl_LightModelParameters
          gl_LightModel gl_LightModelProducts gl_FrontLightModelProduct
          gl_BackLightModelProduct gl_LightProducts gl_FrontLightProduct
          gl_BackLightProduct gl_TextureEnvColor gl_EyePlaneS gl_EyePlaneT gl_EyePlaneR
          gl_EyePlaneQ gl_ObjectPlaneS gl_ObjectPlaneT gl_ObjectPlaneR gl_ObjectPlaneQ
          gl_FogParameters gl_Fog
        )
      end