Add a button to go back to the beginning

Allows to run benchmark on multiple configurations, without
closing benchmark software.

benchmark/space/__init__.py

@@ -45,6 +45,20 @@ images = {}
 current_progress = 0.0
 progress_lock = Lock()
 
+def reset_global_state():
+    global global_result_platform
+    global global_progress_status
+    global global_result_stats
+    global global_result_dict
+    global global_background_image_path
+    global global_scene_status
+    global_result_platform = None
+    global_progress_status = None
+    global_result_stats = None
+    global_result_dict = None
+    global_background_image_path = ""
+    global_scene_status = {}
+
 ################################################################################
 # Draw Utilities.
 
@@ -468,6 +482,11 @@ class BENCHMARK_PT_main(Panel):
         sub.scale_y = 1.5
         sub.operator("benchmark.save", text="SAVE")
 
+        sub = col.row()
+        sub.emboss = 'NONE'
+        sub.scale_y = 1.5
+        sub.operator("benchmark.restart", text="RESTART")
+
         split.label()
 
     def draw(self, context):
@@ -589,7 +608,7 @@ class BENCHMARK_OT_run(bpy.types.Operator):
         # Construct final stats string
         if global_cancel:
             global_result_dict = None
-            self.init_state()
+            reset_global_state()
         else:
             global_result_stats = ""
             for stat in global_result_dict["stats"]:
@@ -671,20 +690,6 @@ class BENCHMARK_OT_run(bpy.types.Operator):
         context.window_manager.modal_handler_add(self)
         return {'RUNNING_MODAL'}
 
-    def init_state(self):
-        global global_result_platform
-        global global_progress_status
-        global global_result_stats
-        global global_result_dict
-        global global_background_image_path
-        global global_scene_status
-        global_result_platform = None
-        global_progress_status = None
-        global_result_stats = None
-        global_result_dict = None
-        global_background_image_path = ""
-        global_scene_status = {}
-
     def cancel_request(self, context):
         global global_cancel
         progress_lock.acquire()
@@ -743,6 +748,16 @@ class BENCHMARK_OT_share(bpy.types.Operator):
     def invoke(self, context, event):
         return {'FINISHED'}
 
+################################################################################
+# Restart benchmark.
+
+class BENCHMARK_OT_restart(bpy.types.Operator):
+    bl_idname = "benchmark.restart"
+    bl_label = "Start new benchmark round"
+
+    def invoke(self, context, event):
+        reset_global_state()
+        return {'FINISHED'}
 
 ################################################################################
 # Configuration.
@@ -788,6 +803,7 @@ style.widget.points = 12
 
 classes = (
     BENCHMARK_PT_main,
+    BENCHMARK_OT_restart,
     BENCHMARK_OT_run,
     BENCHMARK_OT_save,
     BENCHMARK_OT_share,