From 9aa0a3f5335496481305ac63af4dd09fb6f449b4 Mon Sep 17 00:00:00 2001
From: Jeroen Bakker <jeroen@blender.org>
Date: Wed, 21 Jul 2021 09:35:21 +0200
Subject: Cleanup Preview rendering: Separate world preparation.

Small cleanup that moves world preparation out of scene preparation.
---
 source/blender/editors/render/render_preview.c | 54 +++++++++++++++++++-------
 1 file changed, 40 insertions(+), 14 deletions(-)

(limited to 'source/blender')

diff --git a/source/blender/editors/render/render_preview.c b/source/blender/editors/render/render_preview.c
index 259bbc2353e..36ca7718c7a 100644
--- a/source/blender/editors/render/render_preview.c
+++ b/source/blender/editors/render/render_preview.c
@@ -348,6 +348,38 @@ static ID *duplicate_ids(ID *id, const bool allow_failure)
   }
 }
 
+static World *preview_get_world(Main *pr_main)
+{
+  World *result = NULL;
+  const char *world_name = "World";
+  result = BLI_findstring(&pr_main->worlds, world_name, offsetof(ID, name) + 2);
+
+  /* No world found return first world. */
+  if (result == NULL) {
+    result = pr_main->worlds.first;
+  }
+
+  BLI_assert(result & "Preview file has no world.");
+  return result;
+}
+
+static void preview_sync_exposure(World *dst, const World *src)
+{
+  BLI_assert(dst);
+  BLI_assert(src);
+  dst->exp = src->exp;
+  dst->range = src->range;
+}
+
+static World *preview_prepare_world(Main *pr_main, const World *world)
+{
+  World *result = preview_get_world(pr_main);
+  if (world) {
+    preview_sync_exposure(result, world);
+  }
+  return result;
+}
+
 /* call this with a pointer to initialize preview scene */
 /* call this with NULL to restore assigned ID pointers in preview scene */
 static Scene *preview_prepare_scene(
@@ -368,13 +400,7 @@ static Scene *preview_prepare_scene(
 
     /* this flag tells render to not execute depsgraph or ipos etc */
     sce->r.scemode |= R_BUTS_PREVIEW;
-    /* set world always back, is used now */
-    sce->world = pr_main->worlds.first;
-    /* now: exposure copy */
-    if (scene->world) {
-      sce->world->exp = scene->world->exp;
-      sce->world->range = scene->world->range;
-    }
+    BLI_strncpy(sce->r.engine, scene->r.engine, sizeof(sce->r.engine));
 
     sce->r.color_mgt_flag = scene->r.color_mgt_flag;
     BKE_color_managed_display_settings_copy(&sce->display_settings, &scene->display_settings);
@@ -400,13 +426,13 @@ static Scene *preview_prepare_scene(
 
     sce->r.cfra = scene->r.cfra;
 
+    /* Setup the world. */
+    sce->world = preview_prepare_world(pr_main, scene->world);
+
     if (id_type == ID_TE) {
       /* Texture is not actually rendered with engine, just set dummy value. */
       BLI_strncpy(sce->r.engine, RE_engine_id_BLENDER_EEVEE, sizeof(sce->r.engine));
     }
-    else {
-      BLI_strncpy(sce->r.engine, scene->r.engine, sizeof(sce->r.engine));
-    }
 
     if (id_type == ID_MA) {
       Material *mat = NULL, *origmat = (Material *)id;
@@ -689,8 +715,8 @@ void ED_preview_draw(const bContext *C, void *idp, void *parentp, void *slotp, r
 struct ObjectPreviewData {
   /* The main for the preview, not of the current file. */
   Main *pr_main;
-  /* Copy of the object to create the preview for. The copy is for thread safety (and to insert it
-   * into an own main). */
+  /* Copy of the object to create the preview for. The copy is for thread safety (and to insert
+   * it into an own main). */
   Object *object;
   int sizex;
   int sizey;
@@ -1549,8 +1575,8 @@ static void icon_preview_startjob_all_sizes(void *customdata,
 
     /* check_engine_supports_preview() checks whether the engine supports "preview mode" (think:
      * Material Preview). This check is only relevant when the render function called below is
-     * going to use such a mode. Object and Action render functions use Solid mode, though, so they
-     * can skip this test. */
+     * going to use such a mode. Object and Action render functions use Solid mode, though, so
+     * they can skip this test. */
     /* TODO: Decouple the ID-type-specific render functions from this function, so that it's not
      * necessary to know here what happens inside lower-level functions. */
     const bool use_solid_render_mode = (ip->id != NULL) && ELEM(GS(ip->id->name), ID_OB, ID_AC);
-- 
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