PACKHALF2X16(3G)

💖 packHalf2x16 — the manual page, but make it make sense 💖

okay bestie, so this is the 3G manual, and the star of the show is a lil function called packHalf2x16. no cap, it's lowkey iconic.

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✨ NAME ✨

packHalf2x16 — convert two 32-bit floating-point quantities to 16-bit quantities and pack them into a single 32-bit integer 🎀

like, two floats go in, one chonky integer comes out. the way that it just works. 🦋

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🌸 DECLARATION 🌸

uint packHalf2x16(vec2 v);

that's it, that's the whole signature. she's simple, she's elegant, she ate. 💅

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🎀 PARAMETERS 🎀

• v — bestie, this is a vector of two 32-bit floating point values. they're the ones getting converted to 16-bit representation and packed into the result. two float girlies, one destination ✨

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💜 DESCRIPTION 💜

so packHalf2x16 returns an unsigned integer, right? and it gets there by converting the components of a two-component floating-point vector into the 16-bit floating-point representation found in the OpenGL Specification, and then packing those two 16-bit integers into a single 32-bit unsigned integer. 🔥

here's the part you gotta remember, fr fr:

• the first vector component specifies the 16 least-significant bits of the result 🫶
• the second component specifies the 16 most-significant bits 👑

so like, order matters. don't come for me if you flip them. 🙈

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🌈 VERSION SUPPORT 🌈

vibe check on which OpenGL Shading Language Versions are serving this function:

• GLSL 1.10 — - (nope, not yet 💀)
• GLSL 1.20 — - (still no 💀)
• GLSL 1.30 — - (crickets 💀)
• GLSL 1.40 — - (bestie no 💀)
• GLSL 1.50 — - (nada 💀)
• GLSL 3.30 — - (not invited 💀)
• GLSL 4.00 — - (so close yet so far 💀)
• GLSL 4.10 — - (the drought continues 💀)
• GLSL 4.20 — ✔ (SHE'S HERE, she arrived 👑✨)
• GLSL 4.30 — ✔ (still slaying 💖)
• GLSL 4.40 — ✔ (consistent queen 🎀)
• GLSL 4.50 — ✔ (periodt 💅)

so the function name is packHalf2x16, and she really said "4.20 and up only." main character energy fr. 🌸

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🦋 SEE ALSO 🦋

go read these next, bestie, they're in the same friend group:

• packDouble2x32()
• unpackDouble2x32()
• unpackHalf2x16()

iykyk 💜

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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 (yes, again, she said it twice) 💖

Copyright © 2011-2014 Khronos Group

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okay that's the whole page bestie, no notes, go pack some halves 💅✨

and for the lil sign-off: this one came from [FIXME: source], dated 01/03/2018, and it lives in the 3G manual as PACKHALF2X16(3G). mwah, love u, bye 🫶🎀