SDL_SetWindowOpacity(3)

✨ SDL_SetWindowOpacity ✨

okay bestie, welcome to the SDL3 FUNCTIONS section of the manual, page SDL_SetWindowOpacity(3) — yes that's the whole title, we're being formal today 💅

---

🎀 NAME 🎀

SDL_SetWindowOpacity — set the opacity for a window. that's it. that's the whole job. she does one thing and she does it slayfully 🫶

---

🌸 SYNOPSIS 🌸

#include <SDL3/SDL_video.h>

bool SDL_SetWindowOpacity(SDL_Window *window, float opacity);

literally just one function call, no cap. include the header, pass a window, pass a float, done 💖

---

🦋 DESCRIPTION 🦋

okay so here's the tea: that opacity parameter is gonna get clamped internally between 0.0f (fully transparent, i.e. ghost mode 👻) and 1.0f (fully opaque, i.e. solid, present, main character energy 👑). so like, if you pass something unhinged like 5.0f, she's not gonna crash out — she just clamps it. periodt.

also — and this is the important part — this function will return false if setting the opacity isn't supported. so like, not every platform/window situation is gonna let you do this. vibe check first, bestie 😭

---

🍓 FUNCTION PARAMETERS 🍓

• window — the window which will be made transparent or opaque. the canvas. the moment. the whole point 🌈
• opacity — the opacity value (0.0f - transparent, 1.0f - opaque). slide it anywhere in that range, or don't, she clamps anyway 💅

---

⭐ RETURN VALUE ⭐

returns true on success or false on failure 🫠 and if it's a false?? call SDL_GetError() for more information — she will tell you what went wrong, she's not gonna leave you guessing, she's a communicator 💜

---

🧚 THREAD SAFETY 🧚

⚠️ this function should only be called on the main thread. do not be texting this function from some random background thread at 3am, that's not the vibe, that's undefined behavior's cousin 🙈

---

🌟 AVAILABILITY 🌟

this function is available since SDL 3.2.0. so if you're on something older... girl. update. 😌

---

👑 SEE ALSO 👑

• SDL_GetWindowOpacity(3) — the little sibling that reads the value back. iykyk 🔥

---

and that's the whole page fr fr!! 💖✨

Simple Directmedia Layer brought you this one, straight out of SDL 3.4.18, and this page right here is SDL_SetWindowOpacity(3). mwah, stan, bye 🎀🦋🌸