Fix T93727: Tiled render error in Cycles after changing temp directory

Consider temporary directory to be variant part of session configuration
which gets communicated to the tile manager on render reset.

This allows to be able to render with one temp directory, change the
directory, render again and have proper render result even with enabled
persistent data.

For the ease of access to the temp directory expose it via the render
engine API (engine.temp_directory).

Differential Revision: https://developer.blender.org/D13790

1 files changed, 17 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_render.c b/source/blender/makesrna/intern/rna_render.c
index fcb46904e8d..28dcad4444d 100644
--- a/source/blender/makesrna/intern/rna_render.c
+++ b/source/blender/makesrna/intern/rna_render.c
@@ -98,6 +98,7 @@ const EnumPropertyItem rna_enum_bake_pass_type_items[] = {
 
 #  include "RNA_access.h"
 
+#  include "BKE_appdir.h"
 #  include "BKE_context.h"
 #  include "BKE_report.h"
 
@@ -420,6 +421,16 @@ static StructRNA *rna_RenderEngine_refine(PointerRNA *ptr)
                                                         &RNA_RenderEngine;
 }
 
+static void rna_RenderEngine_tempdir_get(PointerRNA * /*ptr*/, char *value)
+{
+  BLI_strncpy(value, BKE_tempdir_session(), FILE_MAX);
+}
+
+static int rna_RenderEngine_tempdir_length(PointerRNA * /*ptr*/)
+{
+  return strlen(BKE_tempdir_session());
+}
+
 static PointerRNA rna_RenderEngine_render_get(PointerRNA *ptr)
 {
   RenderEngine *engine = (RenderEngine *)ptr->data;
@@ -860,6 +871,12 @@ static void rna_def_render_engine(BlenderRNA *brna)
   RNA_def_property_int_sdna(prop, NULL, "resolution_y");
   RNA_def_property_clear_flag(prop, PROP_EDITABLE);
 
+  prop = RNA_def_property(srna, "temporary_directory", PROP_STRING, PROP_NONE);
+  RNA_def_function_ui_description(func, "The temp directory used by Blender");
+  RNA_def_property_string_funcs(
+      prop, "rna_RenderEngine_tempdir_get", "rna_RenderEngine_tempdir_length", NULL);
+  RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+
   /* Render Data */
   prop = RNA_def_property(srna, "render", PROP_POINTER, PROP_NONE);
   RNA_def_property_struct_type(prop, "RenderSettings");