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((function textureGrad
   (signature vec4
     (parameters
       (declare (in) sampler1D sampler)
       (declare (in) float P) 
       (declare (in) float dPdx) 
       (declare (in) float dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature ivec4
     (parameters
       (declare (in) isampler1D sampler)
       (declare (in) float P) 
       (declare (in) float dPdx) 
       (declare (in) float dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature uvec4
     (parameters
       (declare (in) usampler1D sampler)
       (declare (in) float P) 
       (declare (in) float dPdx) 
       (declare (in) float dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature vec4
     (parameters
       (declare (in) sampler2D sampler)
       (declare (in) vec2 P) 
       (declare (in) vec2 dPdx) 
       (declare (in) vec2 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature ivec4
     (parameters
       (declare (in) isampler2D sampler)
       (declare (in) vec2 P) 
       (declare (in) vec2 dPdx) 
       (declare (in) vec2 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature uvec4
     (parameters
       (declare (in) usampler2D sampler)
       (declare (in) vec2 P) 
       (declare (in) vec2 dPdx) 
       (declare (in) vec2 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature vec4
     (parameters
       (declare (in) sampler3D sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature ivec4
     (parameters
       (declare (in) isampler3D sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature uvec4
     (parameters
       (declare (in) usampler3D sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature vec4
     (parameters
       (declare (in) samplerCube sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature ivec4
     (parameters
       (declare (in) isamplerCube sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature uvec4
     (parameters
       (declare (in) usamplerCube sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature vec4
     (parameters
       (declare (in) sampler1DArray sampler)
       (declare (in) vec2 P) 
       (declare (in) vec2 dPdx) 
       (declare (in) vec2 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature ivec4
     (parameters
       (declare (in) isampler1DArray sampler)
       (declare (in) vec2 P) 
       (declare (in) vec2 dPdx) 
       (declare (in) vec2 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature uvec4
     (parameters
       (declare (in) usampler1DArray sampler)
       (declare (in) vec2 P) 
       (declare (in) vec2 dPdx) 
       (declare (in) vec2 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature vec4
     (parameters
       (declare (in) sampler2DArray sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature ivec4
     (parameters
       (declare (in) isampler2DArray sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

   (signature uvec4
     (parameters
       (declare (in) usampler2DArray sampler)
       (declare (in) vec3 P) 
       (declare (in) vec3 dPdx) 
       (declare (in) vec3 dPdy) )
     ((return (txd (var_ref sampler) (var_ref P) (0 0 0) 1 () ((var_ref dPdx) (var_ref dPdy)) ))))

)
)