Graphics Format Swizzle.
| FormatSwizzleR | The channel specified contains red. | 
| FormatSwizzleG | The channel specified contains green. | 
| FormatSwizzleB | The channel specified contains blue. | 
| FormatSwizzleA | The channel specified contains alpha. | 
| FormatSwizzle0 | The channel specified is not present for the format | 
| FormatSwizzle1 | The channel specified is not present for the format. |