renderdiff: add transmission and ssao tests

 - Add transmission and ssao tests
 - Small mods to README.md
 - Add transmission models to gltf list
 - Change focal length to zoom in for more details

RDIFF_BRANCH=pf/renderdiff-add-transmission

Author: poweifeng

test/renderdiff/README.md

@@ -1,6 +1,6 @@
 # Rendering Difference Test
 
-We created a few scripts to run `gltf_viewer` and produce headless renderings.
+This tool is a collections of scripts to run `gltf_viewer` and produce headless renderings.
 
 This is mainly useful for continuous integration where GPUs are generally not available on cloud
 machines. To perform software rasterization, these scripts are centered around [Mesa]'s
@@ -9,10 +9,10 @@ Additionally, we should be able to use GPUs where available (though this is more
 work).
 
 The script `render.py` contains the core logic for taking input parameters (such as the test
-description file) and then running gltf_viewer to produce the renderings.
+description file) and then running `gltf_viewer` to produce the renderings.
 
 In the `test` directory is a list of test descriptions that are specified in json. Please see
-`sample.json` to parse the structure.
+`sample.json` to glean the structure.
 
 ## Setting up python
 

test/renderdiff/src/compare.py

@@ -229,15 +229,15 @@ def single_test(src_dir, dest_dir, src_fname):
   important_print(f'Successfully compared {success_count} / {len(results)} images')
 
   if tolerance_used_details:
-    pstr = 'Tolerance-based passes:'
+    pstr = 'Passed:'
     for detail in tolerance_used_details:
       pstr += '\n' + detail
     important_print(pstr)
 
   if failed_details:
     pstr = 'Failed:'
     for detail in failed_details:
-      pstr = '\n' + detail
+      pstr += '\n' + detail
     important_print(pstr)
   if len(failed) > 0:
     exit(1)

test/renderdiff/src/update_golden.py

@@ -74,7 +74,7 @@ def _get_deletes_updates(update_dir, golden_dir):
     for fpath in base.intersection(new):
       base_fpath = os.path.join(golden_dir, fpath)
       new_fpath = os.path.join(update_dir, fpath)
-      if (ext == 'tif' and not same_image(new_fpath, base_fpath)) or \
+      if (ext == 'tif' and not same_image(new_fpath, base_fpath)[0]) or \
          (ext == 'json' and _file_as_str(new_fpath) != _file_as_str(base_fpath)):
         update.append(fpath)
 

test/renderdiff/tests/gltf_models.txt

@@ -1,12 +1,13 @@
 AlphaBlendModeTest
 AttenuationTest
-Box
 BoomBoxWithAxes
+Box
 BoxInterleaved
 BoxTextured
 BoxTexturedNonPowerOfTwo
 Duck
 IridescenceSuzanne
+IridescentDishWithOlives
 Lantern
 MetalRoughSpheres
 NegativeScaleTest
@@ -17,4 +18,5 @@ Sponza
 Suzanne
 TextureCoordinateTest
 TextureSettingsTest
+TransmissionRoughnessTest
 TwoSidedPlane

test/renderdiff/tests/presubmit.json

@@ -5,9 +5,9 @@
     "presets": [
         {
             "name": "base",
-            "models": ["Box", "BoxTextured", "Duck", "lucy", "FlightHelmet"],
+            "models": ["Box", "BoxTextured", "FlightHelmet", "lucy"],
             "rendering": {
-                "viewer.cameraFocusDistance": 0,
+                "viewer.cameraFocalLength": 35.0,
                 "view.postProcessingEnabled": true,
                 "view.dithering": "NONE"
             },
@@ -17,27 +17,54 @@
             }
         },
         {
-            "name": "helmet_only",
+            "name": "bloom_models",
             "models": ["DamagedHelmet"],
             "rendering": {}
+        },
+        {
+            "name": "ssao_models",
+            "models": ["Duck", "lucy"],
+            "rendering": {}
+        },
+        {
+            "name": "transmission_models",
+            "models": ["TransmissionRoughnessTest", "IridescentDishWithOlives"],
+            "rendering": {}
         }
     ],
     "tests": [
         {
             "name": "Bloom",
-            "description": "Testing bloom",
-            "apply_presets": ["base", "helmet_only"],
+            "description": "Bloom",
+            "apply_presets": ["base", "bloom_models"],
             "rendering": {
                 "view.bloom.enabled": true
             }
         },
         {
             "name": "MSAA",
-            "description": "Testing multisampling anti-aliasing",
+            "description": "Multisampling anti-aliasing",
             "apply_presets": ["base"],
             "rendering": {
                 "view.msaa.enabled": true
             }
+        },
+        {
+            "name": "Transimssion",
+            "description": "transmission",
+            "apply_presets": ["base", "transmission_models"],
+            "rendering": {
+                "viewer.cameraFocalLength": 52.0,
+                "view.screenSpaceReflections.enabled": true
+            }
+        },
+        {
+            "name": "SSAO",
+            "description": "Screen space ambient occulsion",
+            "apply_presets": ["base", "ssao_models"],
+            "rendering": {
+                "view.ssao.enabled": true
+            }
         }
     ]
 }