A four-component, 64-bit packed unsigned normalized format that has a 10-bit A component in bits 30..39, a 10-bit R component in bits 20..29, a 10-bit G component in bits 10..19, and a 10-bit B component in bits 0..9. The components are linearly encoded and their values range from -0.752941 to 1.25098 (pre-expansion). The alpha component is clamped to either 0.0 or 1.0 on sampling, rendering, and writing operations.
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