Sprite atlas, instancing and uniform buffer size

[Dark_Photon]

@FurredDragon

Works like a charm
Bindless textures, all 5 instances in a single draw call

Sweet!

However, I need to implement some support for [non-NVIDIA] “GPUs”. … I’m not targeting only NVIDIA users

For example, I still can use bindless textures but draw only 1 instance per DC (it worked for me, but it doesn’t seem to be a good idea)

Right. glMultiDrawArraysIndirect() or glMultiDrawElementsIndirect() should fix that right up. Just put one instance per sub-draw record, and lookup your bindless texture handle using gl_DrawID.

A related note that you probably won’t care about for a long while…:

While instanced draw calls or MDI (MultiDrawIndirect) draw calls can be very efficient and save a lot of needless CPU time dispatching draw work, using them with trivial instances (few vertices per instance or sub-draw) probably won’t max out your GPU’s vertex throughput. There are several options to achieve higher vertex throughput, but they’re more complex -to- considerably more complex to implement than simple instancing or MDI. You almost certainly don’t need this right now. In case you (or someone reading this thread later) cares, here’s a thread on that…

GPU vertex dispatch for MultiDrawIndirect and/or Instanced draw calls

Doing some reading, I see indications (but not outright statements) in GPU vendor documentation that GPUs do not pack: vertices across different instances in an instanced draw, nor vertices across different draws in a MultiDrawIndirect draw call into shared thread groups (warps or wavefronts). I also find devs on the net saying that GPUs do not do this, but without a pointer to vendor docs as the source. My question is, does anyone know whether this is (or is not) the case? (If so, I gue…