text: GL_EXT_texture_cube_map_array
  http://www.opengl.org/registry/specs/EXT/texture_cube_map_array.txt
  GL_EXT_texture_cube_map_array
  
  	GL_TEXTURE_CUBE_MAP_ARRAY_EXT 0x9009
  	GL_TEXTURE_BINDING_CUBE_MAP_ARRAY_EXT 0x900A
  	GL_SAMPLER_CUBE_MAP_ARRAY_EXT 0x900C
  	GL_SAMPLER_CUBE_MAP_ARRAY_SHADOW_EXT 0x900D
  	GL_INT_SAMPLER_CUBE_MAP_ARRAY_EXT 0x900E
  	GL_UNSIGNED_INT_SAMPLER_CUBE_MAP_ARRAY_EXT 0x900F
  	GL_IMAGE_CUBE_MAP_ARRAY_EXT 0x9054
  	GL_INT_IMAGE_CUBE_MAP_ARRAY_EXT 0x905F
  	GL_UNSIGNED_INT_IMAGE_CUBE_MAP_ARRAY_EXT 0x906A
  