Cycles: Refactor Progress system to provide better estimates

The Progress system in Cycles had two limitations so far:
 - It just counted tiles, but ignored their size. For example, when rendering a 600x500 image with 512x512 tiles, the right 88x500 tile would count for 50% of the progress, although it only covers 15% of the image.
 - Scene update time was incorrectly counted as rendering time - therefore, the remaining time started very long and gradually decreased.

This patch fixes both problems:
First of all, the Progress now has a function to ignore time spans, and that is used to ignore scene update time.
The larger change is the tile size: Instead of counting samples per tile, so that the final value is num_samples*num_tiles, the code now counts every sample for every pixel, so that the final value is num_samples*num_pixels.

Along with that, some unused variables were removed from the Progress and Session classes.

Reviewers: brecht, sergey, #cycles

Subscribers: brecht, candreacchio, sergey

Differential Revision: https://developer.blender.org/D2214

1 files changed, 5 insertions, 1 deletions

diff --git a/intern/cycles/device/opencl/opencl_mega.cpp b/intern/cycles/device/opencl/opencl_mega.cpp
index 369c086df57..6ea7619e022 100644
--- a/intern/cycles/device/opencl/opencl_mega.cpp
+++ b/intern/cycles/device/opencl/opencl_mega.cpp
@@ -39,6 +39,10 @@ public:
 	{
 	}
 
+	virtual bool show_samples() const {
+		return true;
+	}
+
 	virtual void load_kernels(const DeviceRequestedFeatures& /*requested_features*/,
 	                          vector<OpenCLProgram*> &programs)
 	{
@@ -120,7 +124,7 @@ public:
 
 					tile.sample = sample + 1;
 
-					task->update_progress(&tile);
+					task->update_progress(&tile, tile.w*tile.h);
 				}
 
 				/* Complete kernel execution before release tile */