Merge pull request #825 from charlesfleche/dev_667_support_recent_ale…

…mbic

Fix compatibility for AbcCoreOgawa::ReadArchive with Alembic>=1.7.9

(Internal change: 1973396)

pxr/usd/plugin/usdAbc/alembicReader.cpp

@@ -96,6 +96,12 @@ TF_DEFINE_ENV_SETTING(
     USD_ABC_XFORM_PRIM_COLLAPSE, true,
     "Collapse Xforms containing a single geometry into a single geom Prim in USD");
 
+#if ALEMBIC_LIBRARY_VERSION >= 10709
+TF_DEFINE_ENV_SETTING(
+    USD_ABC_READ_ARCHIVE_USE_MMAP, false,
+    "Use mmap when reading from an Ogawa archive.");
+#endif
+
 namespace {
 
 using namespace ::Alembic::AbcGeom;
@@ -1370,8 +1376,16 @@ _ReaderContext::_OpenOgawa(
     std::recursive_mutex** mutex) const
 {
     *format = "Ogawa";
+    #if ALEMBIC_LIBRARY_VERSION >= 10709
+    *result = IArchive(
+                Alembic::AbcCoreOgawa::ReadArchive(
+                    _GetNumOgawaStreams(), 
+                    TfGetEnvSetting(USD_ABC_READ_ARCHIVE_USE_MMAP)),
+                filePath, ErrorHandler::kQuietNoopPolicy);
+    #else
     *result = IArchive(Alembic::AbcCoreOgawa::ReadArchive(_GetNumOgawaStreams()),
                        filePath, ErrorHandler::kQuietNoopPolicy);
+    #endif
     return *result;
 }