GL_AMD_sparse_texture
http://www.opengl.org/registry/specs/gl/AMD/sparse_texture.txt
GL_AMD_sparse_texture
	GL_TEXTURE_STORAGE_SPARSE_BIT_AMD 0x00000001
	GL_VIRTUAL_PAGE_SIZE_X_AMD 0x9195
	GL_VIRTUAL_PAGE_SIZE_Y_AMD 0x9196
	GL_VIRTUAL_PAGE_SIZE_Z_AMD 0x9197
	GL_MAX_SPARSE_TEXTURE_SIZE_AMD 0x9198
	GL_MAX_SPARSE_3D_TEXTURE_SIZE_AMD 0x9199
	GL_MAX_SPARSE_ARRAY_TEXTURE_LAYERS 0x919A
	GL_MIN_SPARSE_LEVEL_AMD 0x919B
	GL_MIN_LOD_WARNING_AMD 0x919C
	void glTexStorageSparseAMD (GLenum target, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLsizei layers, GLbitfield flags)
	void glTextureStorageSparseAMD (GLuint texture, GLenum target, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLsizei layers, GLbitfield flags)