[opengl] Unify windows path to posix format in python. (#3470)

Tested on the windows opengl backend manually.

python/taichi/aot/module.py

@@ -1,6 +1,7 @@
 import shutil
 import warnings
 from contextlib import contextmanager
+from pathlib import Path, PurePosixPath
 
 from taichi.core import ti_core as _ti_core
 from taichi.lang import impl, kernel_impl
@@ -193,4 +194,5 @@ def save(self, filepath, filename):
           filepath (str): path to a folder to store aot files.
           filename (str): filename prefix for stored aot files.
         """
+        filepath = str(PurePosixPath(Path(filepath).resolve()))
         self._aot_builder.dump(filepath, filename)

taichi/backends/opengl/aot_module_builder_impl.cpp

@@ -21,15 +21,8 @@ namespace {
 void write_glsl_file(const std::string &output_dir,
                      const std::string &filename,
                      CompiledKernel &k) {
-// Hack to assemble readable windows/unix path.
-// Ideally we could use std::filesystem but it's not available on MacOS 10.14.
-#if defined(TI_PLATFORM_WINDOWS)
-  const std::string path_delim = "\\";
-#else
-  const std::string path_delim = "/";
-#endif
-  const std::string glsl_path = fmt::format(
-      "{}{}{}_{}.glsl", output_dir, path_delim, filename, k.kernel_name);
+  const std::string glsl_path =
+      fmt::format("{}/{}_{}.glsl", output_dir, filename, k.kernel_name);
   std::ofstream fs{glsl_path};
   fs << k.kernel_src;
   k.kernel_src = glsl_path;

tests/python/test_aot.py

@@ -8,11 +8,6 @@
 import taichi as ti
 
 
-def _escape_path_for_win(json_str):
-    return json_str.replace(os.sep,
-                            r'\\') if ti.get_os_name() == 'win' else json_str
-
-
 @ti.test(arch=ti.cc)
 def test_record():
     with tempfile.TemporaryDirectory() as tmpdir:
@@ -62,9 +57,7 @@ def foo(n: ti.template()):
         m.save(tmpdir, filename)
         with open(os.path.join(tmpdir,
                                f'{filename}_metadata.json')) as json_file:
-            json_str = ''.join(json_file.readlines())
-            json_str = _escape_path_for_win(json_str)
-            json.loads(json_str)
+            json.load(json_file)
 
 
 @ti.test(arch=ti.opengl)
@@ -175,6 +168,4 @@ def init():
         m.save(tmpdir, filename)
         with open(os.path.join(tmpdir,
                                f'{filename}_metadata.json')) as json_file:
-            json_str = ''.join(json_file.readlines())
-            json_str = _escape_path_for_win(json_str)
-            json.loads(json_str)
+            json.load(json_file)