Eevee: add regression tests.

This adds Eevee render tests using the Cycles files. Currently it must
be enabled by setting WITH_OPENGL_RENDER_TESTS=ON. Once we have reference
images we can enable it by default.

Some of the Cycles and Eevee tests are also currently broken due to
modifier and particle changes.

Differential Revision: https://developer.blender.org/D3182

tests/python/cycles_render_tests.py

@@ -77,6 +77,7 @@ def render_file(filepath, output_filepath):
             shutil.copy(frame_filepath, output_filepath)
             os.remove(frame_filepath)
         if VERBOSE:
+            print(" ".join(command))
             print(output.decode("utf-8"))
         return None
     except subprocess.CalledProcessError as e:
@@ -84,6 +85,7 @@ def render_file(filepath, output_filepath):
         if os.path.exists(frame_filepath):
             os.remove(frame_filepath)
         if VERBOSE:
+            print(" ".join(command))
             print(e.output.decode("utf-8"))
         if b"Error: engine not found" in e.output:
             return "NO_ENGINE"
@@ -95,6 +97,7 @@ def render_file(filepath, output_filepath):
         if os.path.exists(frame_filepath):
             os.remove(frame_filepath)
         if VERBOSE:
+            print(" ".join(command))
             print(e)
         return "CRASH"