SDL_FlushRenderer(3)

✨ SDL_FlushRenderer(3) ✨

okay bestie, welcome to the SDL3 FUNCTIONS corner of the SDL_FlushRenderer page 💖 this one's short, it's sweet, and it's giving "niche but crucial" energy.

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🎀 NAME 🎀

SDL_FlushRenderer — force the rendering context to flush any pending commands and state. like, make it cough up everything it's been sitting on. periodt. 💅

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🌸 SYNOPSIS 🌸

#include <SDL3/SDL_render.h>

bool SDL_FlushRenderer(SDL_Renderer *renderer);

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🦋 DESCRIPTION 🦋

so here's the tea: you do not need to call this function, and honestly? you shouldn't — unless you're planning to call into OpenGL/Direct3D/Metal/whatever directly, on top of using an SDL_Renderer. no cap.

this is for a very-specific case: you're using SDL's render API, AND you're also planning to make OpenGL/D3D/whatever calls alongside those SDL render API calls. if that's literally your situation, then yes — call this function between calls to SDL's render API and the low-level API you're using in cooperation. teamwork, bestie 🤝

in all other cases? you can ignore this function. fully. pretend it's not here. it won't be offended 🙈

what this call actually does: it makes SDL flush any pending rendering work it was queueing up to do later in a single batch, and it marks any internal cached state as invalid, so it'll prepare all its state again later, from scratch. slay, clean slate, main character energy ✨

which means you do not need to save state in your rendering code to protect the SDL renderer. cute, right? however — and this is the important bit — there are lots of arbitrary pieces of Direct3D and OpenGL state that can confuse things. so you should use your best judgment and be prepared to make changes if specific state needs to be protected. no skipping that part, fr fr 😭

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🍓 FUNCTION PARAMETERS 🍓

• renderer — the rendering context. that's it, that's the whole list 💜

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⭐ RETURN VALUE ⭐

returns true on success or false on failure; call SDL_GetError() for more information. if it flops, go read the error, don't just sit there guessing 🫶

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🔥 THREAD SAFETY 🔥

this function should only be called on the main thread. no side-quest threads on this one, bestie. 👑

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🌈 AVAILABILITY 🌈

this function is available since SDL 3.2.0. so if you're on anything older, it's not you, it's the version 💀

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and that's the whole page, you ate it 💖 stay iconic, protect your state, and only call this when you're genuinely mixing low-level API calls with SDL's renderer — iykyk.

— with love from the Simple Directmedia Layer girlies 🎀✨ this page ships with SDL 3.4.18, signed off from the SDL_FlushRenderer(3) era. mwah 💋