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Moved check of existing MaterialX addon from bpy_hydra.py to material.cc and log warning only once. #83

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Bogdan Nagirniak merged 3 commits from hydra-matx-check into hydra-render 2023-08-02 07:45:13 +02:00
Conversation 0 Commits 3 Files Changed 2 +28 -7
2 changed files with 28 additions and 7 deletions
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4
scripts/modules/bpy_hydra.py
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@ -6,11 +6,7 @@ __all__ = (
def export_mtlx(material):
""" Exports material to .mtlx file. It is called from Blender source code. """
try:
import materialx.utils as mx_utils
except ImportError:
print("ERROR: no MaterialX addon available")
return ""
doc = mx_utils.export(material, None)
if not doc:

29
source/blender/io/usd/hydra/material.cc
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@ -113,9 +113,34 @@ pxr::HdCullStyle MaterialData::cull_style() const
void MaterialData::export_mtlx()
{
/* Call of python function hydra.export_mtlx() */
PyGILState_STATE gstate;
/* Checking materialx addon */
static bool matx_addon_checked = false;
static bool has_matx_addon = false;
if (!matx_addon_checked) {
gstate = PyGILState_Ensure();
/* Adding second check into the lock, good practice to make this fully correct */
if (!matx_addon_checked) {
Brecht Van Lommel commented 2023-08-01 16:23:31 +02:00
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Can you add another if (!matx_addon_checked) after PyGILState_Ensure() to make this into a double checked lock? Not that it's likely to be a problem, but it's good practice anyway to make this fully correct.

Can you add another `if (!matx_addon_checked)` after `PyGILState_Ensure()` to make this into a double checked lock? Not that it's likely to be a problem, but it's good practice anyway to make this fully correct.
PyObject *mx_module = PyImport_ImportModule("materialx");
has_matx_addon = mx_module != nullptr;
Py_XDECREF(mx_module);
if (!has_matx_addon) {
PyErr_Print();
CLOG_WARN(LOG_HYDRA_SCENE, "No MaterialX addon, materials won't be exported.");
}
matx_addon_checked = true;
}
PyGILState_Release(gstate);
}
if (!has_matx_addon) {
return;
}
/* Call of python function bpy_hydra.export_mtlx() */
gstate = PyGILState_Ensure();
PyObject *module, *dict, *func, *result;