INVERSESQRT(3G)

💖 INVERSESQRT 💖

okay bestie, welcome to INVERSESQRT(3G) — yes that's the 3G manual, the OpenGL shading language one, and yes we're gonna have fun with it. 🎀 This page is literally just about one little function that flips your square root upside down and it's lowkey iconic.

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🌸 NAME 🌸

inversesqrt — return the inverse of the square root of the parameter ✨

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🦋 DECLARATION 🦋

here's the tea, the exact signatures, no notes:

genType inversesqrt(genType x);

genDType inversesqrt(genDType x);

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💜 PARAMETERS 💜

• x — Specify the value of which to take the inverse of the square root.

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✨ DESCRIPTION ✨

so inversesqrt returns the inverse of the square root of $x$; i.e. the value $1 \over { \sqrt x }$. it's giving "math but make it reciprocal". 🧚

🚨 ok important: the result is undefined if $x \leq 0$. not "kinda weird", not "a little off" — undefined, periodt. don't come crying to me when your zero gives you nonsense. 💀

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👑 VERSION SUPPORT 👑

the vibe check on which OpenGL Shading Language versions said yes to this function (✔ = supported, - = not supported):

inversesqrt (genType)

• OpenGL Shading Language Version 1.10 — -
• OpenGL Shading Language Version 1.20 — -
• OpenGL Shading Language Version 1.30 — ✔
• OpenGL Shading Language Version 1.40 — ✔
• OpenGL Shading Language Version 1.50 — ✔
• OpenGL Shading Language Version 3.30 — ✔
• OpenGL Shading Language Version 4.00 — ✔
• OpenGL Shading Language Version 4.10 — ✔
• OpenGL Shading Language Version 4.20 — ✔
• OpenGL Shading Language Version 4.30 — ✔
• OpenGL Shading Language Version 4.40 — ✔
• OpenGL Shading Language Version 4.50 — ✔

inversesqrt (genDType)

• OpenGL Shading Language Version 1.10 — -
• OpenGL Shading Language Version 1.20 — -
• OpenGL Shading Language Version 1.30 — -
• OpenGL Shading Language Version 1.40 — -
• OpenGL Shading Language Version 1.50 — -
• OpenGL Shading Language Version 3.30 — -
• OpenGL Shading Language Version 4.00 — ✔
• OpenGL Shading Language Version 4.10 — ✔
• OpenGL Shading Language Version 4.20 — ✔
• OpenGL Shading Language Version 4.30 — ✔
• OpenGL Shading Language Version 4.40 — ✔
• OpenGL Shading Language Version 4.50 — ✔

like, the genDType version showed up so late to the party, but it made it. 🫶

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🌈 SEE ALSO 🌈

• pow()
• sqrt()

go read those too, they're the friend group. 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/.

Copyright © 2011-2014 Khronos Group

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ok that's the whole page bestie, no cap. this came from [FIXME: source] and it's dated 01/03/2018 — big INVERSESQRT(3G) energy from start to finish. mwah. 💖✨🌸