This reverts PR #914 which introduced a hacky way to replace
all std namespace maths function calls with sycl namespace ones.
Presumably the original intention was to use GLM functions in SYCL
device code (e.g. on GPUs) and force it to use the maths implementations
optimised for the target device. However, this has been very limited
in scope since the start because GLM relies heavily on function pointers
which are illegal to use inside SYCL device code.
The hacky solution shadowing std namespace with glm::std is problematic
in many ways. One was that it required re-introducing all std symbols used
across GLM codebase back to glm::std. The list of these symbols is difficult
to maintain over time without extensive CI testing and unsurprisingly it got
broken. Any code just including (some of) GLM headers now no longer compiles
with SYCL compilers even if GLM is only used on the host side (CPU code).
Remove this hack to allow SYCL programs using GLM on the host side to compile.
The original hack was tested against the ComputeCpp compiler which is now
phased out in favour of Intel's DPC++. Remove also the mention of ComputeCpp
from README. The statement about "any C++11 compiler" still covers the host
code compilation with DPC++.
It is used as default configuration for Visual Studio 64 bits compilation (needs Language Extension).
code changes:
- add new qualifiers:
unaligned_simd_highp
unaligned_simd_mediump
unaligned_simd_lowp
- add use_simd and replace is_aligned
(code for ARM NEON is added but not tested)
