Fix compilation error on mac when built with ARC enabled

[SoylentGraham]

I'm currently building the source directly to a framework/package in xcode (skipping Cmake), and the default setup enables ARC (Automatic ref counting in objective-c)

This is a simple fix (don't manually release!) but hard/impossible to put into a macro, so spun the bulk of the kernel-loading macro into a lambda.

[pierotofy]

../input_data.cpp:75:28: error: ‘getOptimalNewCameraMatrix’ is not a member of ‘cv’
   75 |         cv::Mat newK = cv::getOptimalNewCameraMatrix(cK, distCoeffs, cv::Size(cImg.cols, cImg.rows), 0, cv::Size(), &roi);

I don't think you should remove #include <opencv2/calib3d.hpp>

I'm also not sure I understand the fix here. If you're skipping cmake, can't you just adjust your compiler settings?

[SoylentGraham]

I don't think you should remove #include <opencv2/calib3d.hpp>

I'm also not sure I understand the fix here. If you're skipping cmake, can't you just adjust your compiler settings?

Yeah this was supposed to be in a different branch, I rebuilt skipping opencv. Building with CMake then broke (although as an aside, I think this include can just be in the cpp)

Will do another PR later with some other changes to the loading here (ie, don't try and load from the source-code-path and/or let the user supply shader)

[SoylentGraham]

I'm also not sure I understand the fix here. If you're skipping cmake, can't you just adjust your compiler settings?

I require ARC to be on because of other things, if I turn it off, other things break :)

It's easy to handle compiling with and without ARC (and really, it should be on)