GL_ARB_geometry_shader4
http://www.opengl.org/registry/specs/ARB/geometry_shader4.txt
GL_ARB_geometry_shader4
	GL_LINES_ADJACENCY_ARB 0xA
	GL_LINE_STRIP_ADJACENCY_ARB 0xB
	GL_TRIANGLES_ADJACENCY_ARB 0xC
	GL_TRIANGLE_STRIP_ADJACENCY_ARB 0xD
	GL_PROGRAM_POINT_SIZE_ARB 0x8642
	GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_ARB 0x8C29
	GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER 0x8CD4
	GL_FRAMEBUFFER_ATTACHMENT_LAYERED_ARB 0x8DA7
	GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS_ARB 0x8DA8
	GL_FRAMEBUFFER_INCOMPLETE_LAYER_COUNT_ARB 0x8DA9
	GL_GEOMETRY_SHADER_ARB 0x8DD9
	GL_GEOMETRY_VERTICES_OUT_ARB 0x8DDA
	GL_GEOMETRY_INPUT_TYPE_ARB 0x8DDB
	GL_GEOMETRY_OUTPUT_TYPE_ARB 0x8DDC
	GL_MAX_GEOMETRY_VARYING_COMPONENTS_ARB 0x8DDD
	GL_MAX_VERTEX_VARYING_COMPONENTS_ARB 0x8DDE
	GL_MAX_GEOMETRY_UNIFORM_COMPONENTS_ARB 0x8DDF
	GL_MAX_GEOMETRY_OUTPUT_VERTICES_ARB 0x8DE0
	GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_ARB 0x8DE1
	void glFramebufferTextureARB (GLenum target, GLenum attachment, GLuint texture, GLint level)
	void glFramebufferTextureFaceARB (GLenum target, GLenum attachment, GLuint texture, GLint level, GLenum face)
	void glFramebufferTextureLayerARB (GLenum target, GLenum attachment, GLuint texture, GLint level, GLint layer)
	void glProgramParameteriARB (GLuint program, GLenum pname, GLint value)