Add support for floating point textures to OpenGL

Created by: AmnonOwed

I'm packing data in a texture (PImage) to send to a fragment shader. I'm running into the limitations of the 32bit RGBA format that seems to be the default for every texture in Processing. It's causing banding effects in my output. Switching to floating point textures will most likely solve these problems, because of the increased accuracy.

I have searched high and low (all the forums, the source code, the issue list), but I cannot find a way to use floating points textures in Processing. Is this possible? If not, I would like to post this issue as a feature request.

Inizia tracciando come vengono create le texture PImage di Processing e passate agli fragment shader attraverso il suo percorso OpenGL. Determina quali formati di texture in virgola mobile e quali vincoli dell'hardware supportato devono essere coperti. Il lavoro sarà considerato completato quando sarà disponibile un modo documentato e testato per usare texture in virgola mobile senza l'attuale limitazione a 32-bit RGBA.