GL_NV_tessellation_program5 http://www.opengl.org/registry/specs/NV/tessellation_program5.txt GL_NV_gpu_program5 GL_MAX_PROGRAM_PATCH_ATTRIBS_NV 0x86D8 GL_TESS_CONTROL_PROGRAM_NV 0x891E GL_TESS_EVALUATION_PROGRAM_NV 0x891F GL_TESS_CONTROL_PROGRAM_PARAMETER_BUFFER_NV 0x8C74 GL_TESS_EVALUATION_PROGRAM_PARAMETER_BUFFER_NV 0x8C75