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.

Empieza por rastrear cómo se crean las texturas PImage de Processing y cómo se pasan a los fragment shaders a través de su ruta de OpenGL. Determina qué formatos de textura de coma flotante y qué limitaciones del hardware compatible deben cubrirse. Se considerará terminado cuando exista una forma documentada y probada de usar texturas de coma flotante sin la limitación actual de 32-bit RGBA.