SDL_GetWindowOpacity(3)

✨ SDL_GetWindowOpacity ✨

okay bestie, welcome to the SDL3 FUNCTIONS section of the manual, and today's main character is SDL_GetWindowOpacity(3) — she's giving "how see-through is this window rn" energy 💅

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🌸 NAME 🌸

SDL_GetWindowOpacity — get the opacity of a window. that's it. that's the whole job. she tells you how transparent your window is and she does NOT elaborate 🫶

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🦋 SYNOPSIS 🦋

#include <SDL3/SDL_video.h>

float SDL_GetWindowOpacity(SDL_Window *window);

look at her. one parameter. one float. no drama. iconic ✨

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💖 DESCRIPTION 💖

So here's the vibe: you call this, you get the opacity. Simple.

But important caveat, bestie: if transparency isn't supported on this platform, then opacity will just be returned as 1.0f — and it will not throw an error at you. Like, no fuss, no drama, no SDL_GetError() moment. She just quietly hands you a fully opaque 1.0f and moves on. That's the whole note. don't @ me 😭

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🎀 FUNCTION PARAMETERS 🎀

• window — the window you want to pull the current opacity value from. give her the window, she gives you the number 🪟

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💅 RETURN VALUE 💅

Returns the opacity, and the scale goes like this:

• 0.0f — fully transparent, ghost mode, you can see right through her 👻
• 1.0f — fully opaque, solid, no peeking through, periodt

orrrr -1.0f on failure 💀 — and if that happens you gotta call SDL_GetError() for more info, because she's not gonna tell you what went wrong unprompted. go ask.

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🧚 THREAD SAFETY 🧚

⚠️ main thread only, bestie. this function should only be called on the main thread. no side-quests, no background threads, no "but I thought it'd be fine." it will not be fine. stay on main. 😤

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🌈 AVAILABILITY 🌈

this function has been available since SDL 3.2.0 — so if you're on something older, she simply does not exist yet for you, sorry 🍓

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👑 SEE ALSO 👑

• SDL_SetWindowOpacity(3) — the other half of the duo, the setter to this getter, the yin to her yang, go read it next 🫶

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and that's the page, babe!! source is Simple Directmedia Layer, this is SDL 3.4.18 — the SDL_GetWindowOpacity(3) of it all, no date on the footer because she's timeless like that 💜 thanks for reading, mwah, go check your window opacity responsibly ✨🎀🦋