Only one structured light projector works simultaneously

[perezsolerj]

Due to the shaders implementation of this sensor only one structured light projector can work in each scene. In order to make more than one working at the same time array uniforms are required in the shaders so it can project multiple textures on the scene.

Depending on the GLSL version this could be done in different ways as array support for textures was introduced in GLSL 1.3 and modified in GLSL 4.00: http://stackoverflow.com/questions/12030711/glsl-array-of-textures-of-differing-size . Implementation should work in different versions, or at least don't break the current features in them.