Implement compute device selector

benchmark/foundation/context.py

@@ -11,7 +11,8 @@ class Context:
                  'scenes',
                  'scenes_dir',
                  'configure_script',
-                 'image_output_dir')
+                 'image_output_dir',
+                 'single_compute_scene')
 
     def __init__(self):
         # Full path to blender binary.
@@ -31,6 +32,9 @@ class Context:
         # Directory where render result images will be saved.
         # Empty means no results are saved.
         self.image_output_dir = ""
+        # There is only one file for each of compute device types, which will
+        # do some post-load setup for compute device and tile size.
+        self.single_compute_scene = False
 
     def listAllScenes(self, directory):
         import os
@@ -83,7 +87,9 @@ class Context:
         return True
 
     def getDeviceFileSuffix(self):
-        if self.device_type == 'CPU':
+        if self.single_compute_scene:
+            return ""
+        elif self.device_type == 'CPU':
             return '_cpu'
         elif self.device_type in ('CUDA', 'OPENCL', 'GPU'):
             return '_gpu'