UNPACKHALF2X16(3G)

✨ UNPACKHALF2X16 ✨ (that's the 3G manual, bestie)

okay so. this is unpackHalf2x16, a GLSL function that takes one lil 32-bit integer and goes "hm, what if this was actually two tiny floats" and gives you back a vec2. it's giving magical girl transformation but for bits 💖

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🌸 NAME 🌸

unpackHalf2x16 — convert two 16-bit floating-point values packed into a single 32-bit integer into a vector of two 32-bit floating-point quantities

like. two halves. one integer. one vec2. it's a whole unboxing video 📦✨

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🎀 DECLARATION 🎀

vec2 unpackHalf2x16(uint v);

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💅 PARAMETERS 💅

• v — bestie, you hand over a single 32-bit unsigned integer value that's secretly holding two 16-bit floating point values inside it, waiting to be unpacked. two-for-one, no cap 🫶

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🦋 DESCRIPTION 🦋

unpackHalf2x16 returns a two-component floating-point vector. the components come from unpacking a 32-bit unsigned integer into a pair of 16-bit values, interpreting those values as 16-bit floating-point numbers according to the OpenGL Specification, and then converting them to 32-bit floating-point values. periodt, that's the whole job.

the way it splits is lowkey important:

• the first component of the vector comes from the 16 least-significant bits of v 🌱
• the second component comes from the 16 most-significant bits of v 👑

so the bits aren't shuffled, they're just chillin' in their assigned seats. main character energy for each half ✨

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🔥 VERSION SUPPORT 🔥

so like, was she even available back then? here's the vibe check, function by function 🕰️

Function name: unpackHalf2x16

OpenGL Shading Language Version columns: 1.10, 1.20, 1.30, 1.40, 1.50, 3.30, 4.00, 4.10, 4.20, 4.30, 4.40, 4.50

and the receipts, in order:

• 1.10 — - (nope)
• 1.20 — - (nope)
• 1.30 — - (nope)
• 1.40 — - (nope)
• 1.50 — - (nope)
• 3.30 — - (nope)
• 4.00 — - (nope)
• 4.10 — - (nope)
• 4.20 — ✔ (SHE'S HERE 👑)
• 4.30 — ✔ (still slaying)
• 4.40 — ✔ (still slaying)
• 4.50 — ✔ (still slaying)

tl;dr she showed up in 4.20 and never left. iconic behavior, honestly 💖

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🌈 SEE ALSO 🌈

go bother her siblings, they're all cute:

• packDouble2x32()
• unpackDouble2x32()
• packHalf2x16()

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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/.

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👑 COPYRIGHT (again, yes, it's listed twice, i don't make the rules) 👑

Copyright © 2011-2014 Khronos Group

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okay bye bestie, go unpack some halves 💖✨🎀🦋

this came from the [FIXME: source] drop, dated 01/03/2018, and the manual page is UNPACKHALF2X16(3G) — mwah, xoxo, go touch some floats 🌸💅🫶