added --dump option for exporting input data for test_opengl

[gaborpapp]

closes #112

[floe]

Looks good for me, but since it's changing some internals, maybe @christiankerl can weigh in?

[christiankerl]

Well. My suggestion would be to create a separate binary. E.g. dumprawir implement a simple depthpacketprocessor subclass which just dumps the data. Finally create a custom packet pipeline based on basepacketpipeline you only need to implement one method. This can be done in a single CPP file. I would really appreciate if you make the effort and implement it this way instead of adapting the cpudepthpacketprocessor. Thanks!

[gaborpapp]

We discussed how we address this in #112, but your suggestion seems cleaner. I'll try to do it in this way then.

[christiankerl]

Sorry for not commenting earlier, but I'm little busy lately

[gaborpapp]

another try in #169, closing this.