Build OpenCL program as soon as the OpenCL device is initialized #293
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Before this, the OpenCL program was built when the first frame arrives and the following frames were dropped, because building the program takes a while.
With this change, the OpenCL program is built before the device is started. Then, when the first frame arrives, it only needs to be initialized, which is quite fast.
When the
DepthPacketProcessor::Config
changes, the OpenCL program might need to be re-initialized or even be rebuilt (depending on which config values were changed), but only the config actually changed. This is handled here as well.