Tests: Fix and workaround Metal difference for Storm

* Disable Metal multisampling to match OpenGL.
* Block list all image half/float tests, these can all fail randomly.
* Blocklist tests failing due to issues in OpenUSD Metal implementation.

tests/python/storm_render_tests.py

@@ -10,23 +10,51 @@ from pathlib import Path
 
 # Unsupported or broken scenarios for the Storm render engine
 BLOCKLIST_HYDRA = [
-    # Corrupted output
-    "image_half.*.blend",
-    "image_packed_float.*.blend",
-    "image_packed_half.*.blend",
+    # Corrupted output around borders
+    "image.*_half.*.blend",
+    "image.*_float.*.blend",
     # Differences between devices/drivers causing this to fail
     "image.blend",
 ]
 
 BLOCKLIST_USD = [
-    # Corrupted output
-    "image_half.*.blend",
-    "image_packed_float.*.blend",
-    "image_packed_half.*.blend",
+    # Corrupted output around borders
+    "image.*_half.*.blend",
+    "image.*_float.*.blend",
     # Nondeterministic exporting of lights in the scene
     "light_tree_node_subtended_angle.blend",
 ]
 
+# Metal support in Storm is no as good as OpenGL, though this needs to be
+# retested with newer OpenUSD versions as there are improvements.
+BLOCKLIST_METAL = [
+    # Thinfilm
+    "metallic.*physical.blend",
+    "metallic.*f82.blend",
+    "principled.*thinfilm.*.blend",
+    # Transparency
+    "ray_portal.blend",
+    "transparent.blend",
+    "transparent_shadow.blend",
+    "shadow_all_max_bounces.blend",
+    "underwater_caustics.blend",
+    "shadow_link_transparency.blend",
+    "principled_bsdf_transmission.blend",
+    # Volume
+    "light_link_surface_in_volume.blend",
+    "openvdb.*.blend",
+    "principled_bsdf_interior",
+    # Other
+    "bump.*.blend",
+    "bevel.*.blend",
+    "principled_bsdf_coat.blend",
+    "principled_bsdf_emission.blend",
+    "white_noise.*.blend",
+    "musgrave_multifractal.*.blend",
+    "autosmooth_custom_normals.blend",
+    "diffuse_normal_map.blend",
+]
+
 
 def setup():
     import bpy
@@ -89,12 +117,14 @@ def main():
 
     from modules import render_report
 
+    blocklist = BLOCKLIST_METAL if sys.platform == "darwin" else []
+
     if args.export_method == 'HYDRA':
-        report = render_report.Report("Storm Hydra", args.outdir, args.oiiotool, blocklist=BLOCKLIST_HYDRA)
+        report = render_report.Report("Storm Hydra", args.outdir, args.oiiotool, blocklist=blocklist + BLOCKLIST_HYDRA)
         report.set_reference_dir("storm_hydra_renders")
         report.set_compare_engine('cycles', 'CPU')
     else:
-        report = render_report.Report("Storm USD", args.outdir, args.oiiotool, blocklist=BLOCKLIST_USD)
+        report = render_report.Report("Storm USD", args.outdir, args.oiiotool, blocklist=blocklist + BLOCKLIST_USD)
         report.set_reference_dir("storm_usd_renders")
         report.set_compare_engine('storm_hydra')