Cycles: Add support for denoising in the viewport

The OptiX denoiser can be a great help when rendering in the viewport, since it is really fast
and needs few samples to produce convincing results. This patch therefore adds support for
using any Cycles denoiser in the viewport also (but only the OptiX one is selectable because
the NLM one is too slow to be usable currently). It also adds support for denoising on a
different device than rendering (so one can e.g. render with the CPU but denoise with OptiX).

Reviewed By: #cycles, brecht

Differential Revision: https://developer.blender.org/D6554

1 files changed, 8 insertions, 3 deletions

diff --git a/intern/cycles/render/session.h b/intern/cycles/render/session.h
index ec465601541..3ef2b70879a 100644
--- a/intern/cycles/render/session.h
+++ b/intern/cycles/render/session.h
@@ -154,6 +154,7 @@ class Session {
   void reset(BufferParams &params, int samples);
   void set_samples(int samples);
   void set_pause(bool pause);
+  void set_denoising(bool denoising, bool optix_denoising);
 
   bool update_scene();
   bool load_kernels(bool lock_scene = true);
@@ -178,8 +179,10 @@ class Session {
 
   void update_status_time(bool show_pause = false, bool show_done = false);
 
-  void copy_to_display_buffer(int sample);
   void render();
+  void denoise();
+  void copy_to_display_buffer(int sample);
+
   void reset_(BufferParams &params, int samples);
 
   void run_cpu();
@@ -190,7 +193,7 @@ class Session {
   bool draw_gpu(BufferParams &params, DeviceDrawParams &draw_params);
   void reset_gpu(BufferParams &params, int samples);
 
-  bool acquire_tile(Device *tile_device, RenderTile &tile);
+  bool acquire_tile(Device *tile_device, RenderTile &tile, RenderTile::Task task);
   void update_tile_sample(RenderTile &tile);
   void release_tile(RenderTile &tile);
 
@@ -213,14 +216,16 @@ class Session {
   thread_mutex tile_mutex;
   thread_mutex buffers_mutex;
   thread_mutex display_mutex;
+  thread_condition_variable denoising_cond;
 
   bool kernels_loaded;
   DeviceRequestedFeatures loaded_kernel_features;
 
   double reset_time;
+  double last_update_time;
+  double last_display_time;
 
   /* progressive refine */
-  double last_update_time;
   bool update_progressive_refine(bool cancel);
 
   DeviceRequestedFeatures get_requested_device_features();