CEM_LDR_LUMINANCE_DIRECT              = 0
CEM_LDR_LUMINANCE_BASE_OFFSET         = 1
CEM_HDR_LUMINANCE_LARGE_RANGE         = 2
CEM_HDR_LUMINANCE_SMALL_RANGE         = 3
CEM_LDR_LUMINANCE_ALPHA_DIRECT        = 4
CEM_LDR_LUMINANCE_ALPHA_BASE_OFFSET   = 5
CEM_LDR_RGB_BASE_SCALE                = 6
CEM_HDR_RGB_BASE_SCALE                = 7
CEM_LDR_RGB_DIRECT                    = 8
CEM_LDR_RGB_BASE_OFFSET               = 9
CEM_LDR_RGB_BASE_SCALE_PLUS_TWO_ALPHA = 10
CEM_HDR_RGB                           = 11
CEM_LDR_RGBA_DIRECT                   = 12
CEM_LDR_RGBA_BASE_OFFSET              = 13
CEM_HDR_RGB_LDR_ALPHA                 = 14
CEM_HDR_RGB_HDR_ALPHA                 = 15
CEM_MAX                               = 16