They've both implemented opencl. Nvidia has too. The industry could have built on that common language. Instead, it built on cuda, and complains that the other

They've both implemented opencl. Nvidia has too. The industry could have built on that common language. Instead, it built on cuda, and complains that the other hardware vendors don't have cuda. I attribute this to opencl being the common subset a bunch of companies could agree could be implemented. I wrote some code that compiles as cuda, opencl, C++ and openmp, and the entire exercise was repeatedly "what, opencl can't do that either? damn it".