findMSB — find the index of the most significant bit set to 1 in an integer
genIType findMSB( | genIType value); |
genIType findMSB( | genUType value); |
value Specifies the value whose bits to scan.
findMSB returns the bit number of the most significant bit that is set to 1 in the binary representation of value. For positive integers, the result will be the bit number of the most significant bit that is set to 1. For negative integers, the result will be the bit number of the most significant bit set to 0. For a value of zero or negative 1, -1 will be returned.
| OpenGL Shading Language Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50 |
| findMSB | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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