Cycles: Improve handling of tile file error

Expose them to the interface, and stop rendering as soon as possible.

Differential Revision: https://developer.blender.org/D12617

intern/cycles/blender/blender_session.cpp

@@ -589,6 +589,12 @@ void BlenderSession::render_frame_finish()
 
   for (string_view filename : full_buffer_files_) {
     session->process_full_buffer_from_disk(filename);
+    if (check_and_report_session_error()) {
+      break;
+    }
+  }
+
+  for (string_view filename : full_buffer_files_) {
     path_remove(filename);
   }
 
@@ -1036,20 +1042,27 @@ void BlenderSession::update_status_progress()
     last_progress = progress;
   }
 
-  if (session->progress.get_error()) {
-    string error = session->progress.get_error_message();
-    if (error != last_error) {
-      /* TODO(sergey): Currently C++ RNA API doesn't let us to
-       * use mnemonic name for the variable. Would be nice to
-       * have this figured out.
-       *
-       * For until then, 1 << 5 means RPT_ERROR.
-       */
-      b_engine.report(1 << 5, error.c_str());
-      b_engine.error_set(error.c_str());
-      last_error = error;
-    }
+  check_and_report_session_error();
+}
+
+bool BlenderSession::check_and_report_session_error()
+{
+  if (!session->progress.get_error()) {
+    return false;
   }
+
+  const string error = session->progress.get_error_message();
+  if (error != last_error) {
+    /* TODO(sergey): Currently C++ RNA API doesn't let us to use mnemonic name for the variable.
+     * Would be nice to have this figured out.
+     *
+     * For until then, 1 << 5 means RPT_ERROR. */
+    b_engine.report(1 << 5, error.c_str());
+    b_engine.error_set(error.c_str());
+    last_error = error;
+  }
+
+  return true;
 }
 
 void BlenderSession::tag_update()

intern/cycles/blender/blender_session.h

@@ -147,6 +147,11 @@ class BlenderSession {
  protected:
   void stamp_view_layer_metadata(Scene *scene, const string &view_layer_name);
 
+  /* Check whether session error happenned.
+   * If so, it is reported to the render engine and true is returned.
+   * Otherwise false is returned. */
+  bool check_and_report_session_error();
+
   void builtin_images_load();
 
   /* Is used after each render layer synchronization is done with the goal

intern/cycles/integrator/path_trace.cpp

@@ -801,7 +801,7 @@ void PathTrace::tile_buffer_write_to_disk()
   }
 
   if (!tile_manager_.write_tile(*buffers)) {
-    LOG(ERROR) << "Error writing tile to file.";
+    device_->set_error("Error writing tile to file");
   }
 }
 
@@ -894,7 +894,14 @@ void PathTrace::process_full_buffer_from_disk(string_view filename)
 
   DenoiseParams denoise_params;
   if (!tile_manager_.read_full_buffer_from_disk(filename, &full_frame_buffers, &denoise_params)) {
-    LOG(ERROR) << "Error reading tiles from file.";
+    const string error_message = "Error reading tiles from file";
+    if (progress_) {
+      progress_->set_error(error_message);
+      progress_->set_cancel(error_message);
+    }
+    else {
+      LOG(ERROR) << error_message;
+    }
     return;
   }
 

intern/cycles/render/tile.cpp

@@ -436,7 +436,12 @@ bool TileManager::open_tile_output()
     return false;
   }
 
-  write_state_.tile_out->open(write_state_.filename, write_state_.image_spec);
+  if (!write_state_.tile_out->open(write_state_.filename, write_state_.image_spec)) {
+    LOG(ERROR) << "Error opening tile file: " << write_state_.tile_out->geterror();
+    write_state_.tile_out = nullptr;
+    return false;
+  }
+
   write_state_.num_tiles_written = 0;
 
   VLOG(3) << "Opened tile file " << write_state_.filename;
@@ -497,6 +502,7 @@ bool TileManager::write_tile(const RenderBuffers &tile_buffers)
                                           TypeDesc::FLOAT,
                                           pixels)) {
     LOG(ERROR) << "Error writing tile " << write_state_.tile_out->geterror();
+    return false;
   }
 
   ++write_state_.num_tiles_written;