GLUTOVERLAYDISPLAYFUNC(3)

💖 GLUTOVERLAYDISPLAYFUNC 💖

okay bestie, so this one lives in the GLUTOVERLAYDISPLAYFUNC(3) family of man pages — it's part of OpenGLUT, in the windowcallback library, and it's literally the page that tells you how to hand OpenGLUT a hook for redrawing your overlay. yes, that kind of overlay. let's get into it 🎀

---

✨ SYNOPSIS ✨

#include <openglut.h>

void
glutOverlayDisplayFunc(void( *callback )( void ));

like, that's the whole thing. one function, one callback, so much potential 💅

---

🌸 PARAMETERS 🌸

• callback — your client hook for overlay redisplay. it's the lil' function OpenGLUT will call when it wants the overlay freshened up. you bring the function, it brings the moment ✨

---

🦋 DESCRIPTION 🦋

so here's the tea, bestie: callback gets invoked by OpenGLUT when it wants to refresh an overlay, if OpenGLUT thinks that's necessary. it's generally very similar to glutDisplayFunc(), except — and this is the part you actually need to know — it's different in these ways:

• the redisplay is triggered differently.
• OpenGLUT sets the layer for you. you don't gotta do it, it's handled, periodt 👑
• you don't need to have this callback, and you can deregister it. it's not a forever commitment, it's giving casual 💅

and the key lil' detail: this callback is bound to both the current window AND the layer. both. not one, not the other. both. iykyk 🫶

---

💀 BUGS 💀

ngl, this is the part where we hold hands and look away: OpenGLUT does not implement layers at this time. 😭 so like. yeah. the whole overlay layer thing? not a thing yet in OpenGLUT. manifesting it for later, but right now it's just not there, fr fr.

---

👑 SEE ALSO 👑

go read these too, they're all part of the same lil' ecosystem:

• glutDisplayFunc(3)
• glutPostOverlayRedisplay(3)
• glutEstablishOverlay(3)
• glutUseLayer(3)

---

and that's the page, bestie!! 🎀 this absolute icon of a man page is dated UNDATED and hails from UNTITLED() — yeah, no title, no date, just vibes and a callback signature. slay. 💖✨