Yannick

could you use structured buffers to pass params across shaders, like with compute?

No, MG does not expose it like that. Things like that have been discussed a long time ago, but we can't support it with the current shader pipeline.

Ok so using a cloned shader with parameters set one time is the same than the same shader used by multiple materials where parameters are updated very often?

Ah, I misunderstood. They're not the same. I think using 1 shader is faster. I would be interested to know!

But with only one shader you've to push data at each frames. So textures, etc... Not sure if it's good or not. I would say it's not good but I don't know that's why I ask

Textures in MG are stored in VRAM only, so it's not like the whole thing is uploaded every time you switch. Like I said, I'm not sure which way is faster.

If it's cached by MonoGame internally, using a single instance is probably the faster way !

Not sure if this is relevant at all.. https://developer.download.nvidia.com/books/HTML/gpugems/gpugems_ch28.html …