GL_AMD_vertex_shader_tessellator
http://www.opengl.org/registry/specs/gl/AMD/vertex_shader_tessellator.txt
GL_AMD_vertex_shader_tessellator
	GL_SAMPLER_BUFFER_AMD 0x9001
	GL_INT_SAMPLER_BUFFER_AMD 0x9002
	GL_UNSIGNED_INT_SAMPLER_BUFFER_AMD 0x9003
	GL_TESSELLATION_MODE_AMD 0x9004
	GL_TESSELLATION_FACTOR_AMD 0x9005
	GL_DISCRETE_AMD 0x9006
	GL_CONTINUOUS_AMD 0x9007
	void glTessellationFactorAMD (GLfloat factor)
	void glTessellationModeAMD (GLenum mode)