SDL_scalbnf(3)

💖 SDL_scalbnf(3) 💖

okay bestie, we're in the SDL3 FUNCTIONS section of the manual and today's main character is SDL_scalbnf — she scales stuff. by powers of two. it's giving math girlie and honestly? she ate.

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✨ NAME ✨

SDL_scalbnf — scale x by an integer power of two 🎀

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🌸 SYNOPSIS 🌸

#include <SDL3/SDL_stdinc.h>

float SDL_scalbnf(float x, int n);

like... that's it. two args. one float out. so clean, so iconic ✨

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🦋 DESCRIPTION 🦋

so what she does is: she multiplies x by the *n*th power of the floating point radix — and the radix is always 2, no cap, every single time. 🫶

here's the domain vibe check:

• Domain: -INF <= x <= INF
• n integer
• Range: -INF <= y <= INF

and psssst — this one is for single-precision floating point values, bestie. if you're on your double-precision era, you want SDL_scalbn instead. iykyk 💅

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🍓 FUNCTION PARAMETERS 🍓

• x — the floating point value that's about to get scaled. she's the canvas, she's the moment.
• n — the integer exponent. this is the glow-up multiplier, the "how many times are we doubling" number.

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👑 RETURN VALUE 👑

she returns x * 2^n. literally that. no surprises, no plot twists, just math that shows up on time 🌈

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🔥 THREAD SAFETY 🔥

you can call this from any thread. any of them. all of them. she does not care, she does not get jealous, she is safe everywhere. multitasking queen 👑

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💜 AVAILABILITY 💜

this function has been available since SDL 3.2.0 — so if you're on something older, sorry babe, she wasn't born yet 😭

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🌈 SEE ALSO 🌈

• SDL_scalbn(3) — the double-precision sibling, same energy, more bits
• SDL_powf(3) — when you need powers that aren't just "2, but again"

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reminder bestie: the radix is always 2. don't come at her expecting base-10. she said what she said. 💅

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and that's the whole page!! sourced straight from Simple Directmedia Layer, SDL 3.4.18 era, page SDL_scalbnf(3) 🎀 tysm for reading, go forth and scale responsibly, mwah 💖✨🦋