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Vertex Shader
(mandatory)
Executed for every vertex
Input: Attribute values as defined by vertex data
Output: Attribute values

Tessellation Control Shader
Executed for every primitive (triangle, line, patch)
Input: Attribute values
Output: Attribute values, requested degree of tessellation

Tessellation Evaluation Shader
Executed for every vertex of the tessellated primitive
Input: Attribute values
Output: Attribute values, requested degree of tessellation

Geometry Shader
Executed for every primitive (triangle, line, point), possibly generated by the tessellation, possibly with information about adjacent primitives
Input: Array of attribute values
Output: Arbitrary number of primitives, each with possibly different attribute values

Fragment Shader
(mandatory)
Executed for every fragment
Input: Possibly interpolated attribute values
Output: Fragment data which is written to frame buffers