GL_ARB_sparse_texture
http://www.opengl.org/registry/specs/gl/ARB/sparse_texture.txt
GL_ARB_sparse_texture
	GL_VIRTUAL_PAGE_SIZE_X_ARB 0x9195
	GL_VIRTUAL_PAGE_SIZE_Y_ARB 0x9196
	GL_VIRTUAL_PAGE_SIZE_Z_ARB 0x9197
	GL_MAX_SPARSE_TEXTURE_SIZE_ARB 0x9198
	GL_MAX_SPARSE_3D_TEXTURE_SIZE_ARB 0x9199
	GL_MAX_SPARSE_ARRAY_TEXTURE_LAYERS_ARB 0x919A
	GL_TEXTURE_SPARSE_ARB 0x91A6
	GL_VIRTUAL_PAGE_SIZE_INDEX_ARB 0x91A7
	GL_NUM_VIRTUAL_PAGE_SIZES_ARB 0x91A8
	GL_SPARSE_TEXTURE_FULL_ARRAY_CUBE_MIPMAPS_ARB 0x91A9
	GL_NUM_SPARSE_LEVELS_ARB 0x91AA
	void glTexPageCommitmentARB (GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLboolean commit)
	void glTexturePageCommitmentEXT (GLuint texture, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLboolean commit)