BITFIELDREVERSE(3G)

💅 BITFIELDREVERSE 💅

okay bestie, so this is a page from the 3G manual — that's the OpenGL-adjacent section, the one where all the GLSL girlies live. and today's main character is bitfieldReverse, a function that literally just... flips your bits. backwards. iconic behaviour, honestly.

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✨ NAME ✨

bitfieldReverse — reverse the order of bits in an integer 🦋

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🎀 DECLARATION 🎀

so here's the vibe, two overloads, both valid, both serving:

genIType bitfieldReverse(genIType value);

genUType bitfieldReverse(genUType value);

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🌸 PARAMETERS 🌸

• value — the value whose bits you want reversed. that's it. that's the whole input. hand it over and let her cook 💖

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👑 DESCRIPTION 👑

bitfieldReverse returns the reversal of the bits of value. like, the whole bit order, flipped end to end.

the bit numbered n will be taken from bit (bits - 1) - n of value, where bits is the total number of bits used to represent value.

so yeah. bit 0 becomes the top bit, the top bit becomes bit 0, and everybody in between swaps sides. it's giving mirror. it's giving glow-up in reverse. ✨

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🫶 VERSION SUPPORT 🫶

not every GLSL era was ready for her, ngl. here's the tea, OpenGL Shading Language Version by version:

• 1.10 — - nope 🙈
• 1.20 — - nope
• 1.30 — - nope
• 1.40 — - nope
• 1.50 — - nope
• 3.30 — - nope
• 4.00 — ✔ YES bestie 💖
• 4.10 — ✔ yes
• 4.20 — ✔ yes
• 4.30 — ✔ yes
• 4.40 — ✔ yes
• 4.50 — ✔ yes, still slaying 👑

so like, if you're kicking it in 1.10 through 3.30, bitfieldReverse simply does not exist for you. 4.00 is when she made her debut. no cap. 🎀

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🔥 SEE ALSO 🔥

• bitfieldExtract()
• bitfieldInsert()
• bitCount()

the whole bit-manipulation friend group, fr fr. go say hi. 🦋

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💜 COPYRIGHT 💜

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.

Copyright © 2011-2014 Khronos Group

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and that's the whole page, bestie!! 🎀✨ source situation is [FIXME: source] (yes girl, we know, the FIXME is still sitting there, she's doing her best 😭) and the date on this masterpiece is 01/03/2018 — so it's a lil vintage but still ate. 💅 BITFIELDREVERSE(3G), signing off. mwah 🫶💖