Cycles: Add sample-based runtime profiler that measures time spent in various parts of the CPU kernel

This commit adds a sample-based profiler that runs during CPU rendering and collects statistics on time spent in different parts of the kernel (ray intersection, shader evaluation etc.) as well as time spent per material and object.

The results are currently not exposed in the user interface or per Python yet, to see the stats on the console pass the "--cycles-print-stats" argument to Cycles (e.g. "./blender -- --cycles-print-stats").

Unfortunately, there is no clear way to extend this functionality to CUDA or OpenCL, so it is CPU-only for now.

Reviewers: brecht, sergey, swerner

Reviewed By: brecht, swerner

Differential Revision: https://developer.blender.org/D3892

1 files changed, 12 insertions, 2 deletions

diff --git a/intern/cycles/render/object.h b/intern/cycles/render/object.h
index 87e6e6652ad..134f0bc3577 100644
--- a/intern/cycles/render/object.h
+++ b/intern/cycles/render/object.h
@@ -38,6 +38,7 @@ class Progress;
 class Scene;
 struct Transform;
 struct UpdateObjectTransformState;
+class ObjectManager;
 
 /* Object */
 
@@ -88,6 +89,16 @@ public:
 	 * determined flags which denotes trace-time visibility.
 	 */
 	uint visibility_for_tracing() const;
+
+	/* Returns the index that is used in the kernel for this object. */
+	int get_device_index() const;
+
+protected:
+	/* Specifies the position of the object in scene->objects and
+	 * in the device vectors. Gets set in device_update. */
+	int index;
+
+	friend class ObjectManager;
 };
 
 /* Object Manager */
@@ -123,8 +134,7 @@ public:
 
 protected:
 	void device_update_object_transform(UpdateObjectTransformState *state,
-	                                    Object *ob,
-	                                    const int object_index);
+	                                    Object *ob);
 	void device_update_object_transform_task(UpdateObjectTransformState *state);
 	bool device_update_object_transform_pop_work(
 	        UpdateObjectTransformState *state,