interpolation not working on clesperanto version

[StRigaud]

Trying to fix clEsperanto/pyclesperanto#204

Affine transform without interpolation works, so I assume there is a issue on the interpolation version. Main difference between the two is the position from which the kernel read and write.

My guess is on the read and write position computation. I used the POS_src_INSTANCE and POS_dst_INSTANCE while the original kernel uses float4 and int4 (float2 and int2 for 2d). But READ_IMAGE do not accept a float4 or float2, making the kernel build fail.

why is https://github.com/clEsperanto/clij-opencl-kernels/blob/master/kernels/affine_transform_3d_interpolate_x.cl works while https://github.com/clEsperanto/clij-opencl-kernels/blob/clesperanto_kernels/kernels/affine_transform_interpolate.cl fail to build

I might need an extra help to understand here @haesleinhuepf

[StRigaud]

@haesleinhuepf any feedback?

[StRigaud]

read_imagef can take float2 and float4 as coordinate, which works in combination with the sampler.
The issue can be fixed by updating the defines generation in CLIc.
See: clEsperanto/CLIc@f1f23fe