source/blender/render/hydra/CMakeLists.txt

@@ -20,6 +20,7 @@ set(INC
   ../../../../intern/guardedalloc
   ../../makesdna
   ../../makesrna
+  ../../nodes
   ../../blenlib
   ../../depsgraph
   ../../blenkernel
@@ -66,6 +67,8 @@ set(SRC
   sceneDelegate/scene.cc
   sceneDelegate/material.h
   sceneDelegate/material.cc
+  sceneDelegate/world.h
+  sceneDelegate/world.cc
 )
 
 set(LIB

source/blender/render/hydra/sceneDelegate/blenderSceneDelegate.cc

@@ -50,10 +50,32 @@ void BlenderSceneDelegate::update_material(Material *material)
   }
 }
 
+void BlenderSceneDelegate::add_world(View3DShading &view3DShading, World &world)
+{
+  SdfPath world_light_id = world_id(&view3DShading);
+
+  LOG(INFO) << "Add world: " << world_light_id;
+
+  if (world_data.shading != &view3DShading || world_data.world != &world) {
+    world_data = WorldData(&view3DShading, &world);
+    GetRenderIndex().InsertSprim(HdPrimTypeTokens->domeLight, this, world_light_id);
+  }
+  else {
+    world_data.update_world();
+    GetRenderIndex().GetChangeTracker().MarkSprimDirty(world_light_id, HdLight::AllDirty);
+  }
+}
+
 bool BlenderSceneDelegate::GetVisible(SdfPath const &id)
 {
   ObjectData *obj_data = object_data(id);
-  LOG(INFO) << "GetVisible: " << id.GetAsString() << " " << obj_data->is_visible();
+  LOG(INFO) << "GetVisible: " << id.GetAsString();
+
+  HdRenderIndex &index = GetRenderIndex();
+
+  if (index.GetSprim(HdPrimTypeTokens->domeLight, id)) {
+    return true;
+  }
 
   return obj_data->is_visible();
 }
@@ -207,6 +229,15 @@ SdfPath BlenderSceneDelegate::material_id(Material *material)
   return GetDelegateID().AppendElementString(str);
 }
 
+SdfPath BlenderSceneDelegate::world_id(View3DShading *view3DShading)
+{
+  /* Making id of material in form like M_<pointer in 16 hex digits format>. Example:
+   * W_000002074e812088 */
+  char str[32];
+  snprintf(str, 32, "W_%016llx", (uint64_t)view3DShading);
+  return GetDelegateID().AppendElementString(str);
+}
+
 bool BlenderSceneDelegate::supported_object(Object *object)
 {
   return object->type == OB_MESH ||
@@ -229,6 +260,10 @@ void BlenderSceneDelegate::Populate(BL::Depsgraph &b_deps, View3D *v3d)
     /* Export initial objects */
     update_collection();
 
+    World *world = (World *)b_depsgraph->scene().world().ptr.data;
+
+    add_world(view3d->shading, *world);
+
     is_populated = true;
     return;
   }
@@ -277,6 +312,12 @@ void BlenderSceneDelegate::Populate(BL::Depsgraph &b_deps, View3D *v3d)
       }
       continue;
     }
+
+    if (id.is_a(&RNA_World)) {
+      World *world = (World *)b_depsgraph->scene().world().ptr.data;
+      add_world(view3d->shading, *world);
+      continue;
+    }
   }
 
   if (do_update_collection) {
@@ -397,6 +438,12 @@ GfMatrix4d BlenderSceneDelegate::GetTransform(SdfPath const& id)
 {
   LOG(INFO) << "GetTransform: " << id.GetAsString();
 
+  HdRenderIndex &index = GetRenderIndex();
+
+  if (index.GetSprim(HdPrimTypeTokens->domeLight, id)) {
+    return GfMatrix4d().SetIdentity();
+  }
+
   return objects[id].transform();
 }
 
@@ -404,14 +451,25 @@ VtValue BlenderSceneDelegate::GetLightParamValue(SdfPath const& id, TfToken cons
 {
   LOG(INFO) << "GetLightParamValue: " << id.GetAsString() << " [" << key.GetString() << "]";
   VtValue ret;
-  ObjectData *obj_data = object_data(id);
-  if (obj_data) {
-    if (obj_data->has_data(key)) {
-      ret = obj_data->get_data(key);
+
+  HdRenderIndex &index = GetRenderIndex();
+
+  if (index.GetSprim(HdPrimTypeTokens->domeLight, id)) {
+    if (world_data.has_data(key)) {
+      ret = world_data.get_data(key);
     }
-    else if (key == HdLightTokens->exposure) {
-      // TODO: temporary value, it should be delivered through Python UI
-      ret = 1.0f;
+  }
+  else {
+
+    ObjectData *obj_data = object_data(id);
+    if (obj_data) {
+      if (obj_data->has_data(key)) {
+        ret = obj_data->get_data(key);
+      }
+      else if (key == HdLightTokens->exposure) {
+        // TODO: temporary value, it should be delivered through Python UI
+        ret = 1.0f;
+      }
     }
   }
   return ret;

source/blender/render/hydra/sceneDelegate/blenderSceneDelegate.h

@@ -15,6 +15,7 @@
 #include "RNA_blender_cpp.h"
 
 #include "object.h"
+#include "world.h"
 
 using namespace pxr;
 
@@ -49,6 +50,8 @@ private:
   void update_material(Material *material);
   void update_collection();
   void update_visibility();
+  void add_world(View3DShading &view3DShading, World &world);
+  SdfPath world_id(View3DShading *view3DShading);
 
 private:  
   BL::Depsgraph *b_depsgraph;
@@ -56,6 +59,7 @@ private:
   bool is_populated;
   ObjectDataMap objects;
   MaterialDataMap materials;
+  WorldData world_data;
 };
 
 } // namespace blender::render::hydra

source/blender/render/hydra/sceneDelegate/world.cc

@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
+
+#include <pxr/base/vt/array.h>
+#include <pxr/base/gf/vec2f.h>
+#include <pxr/imaging/hd/light.h>
+#include <pxr/imaging/hd/tokens.h>
+#include <pxr/usd/usdLux/tokens.h>
+
+#include "DNA_node_types.h"
+
+#include "BKE_node.h"
+#include "BKE_node_runtime.hh"
+#include "NOD_shader.h"
+
+#include "world.h"
+
+/* TODO : add tftoken "transparency" and RPR specific? */
+
+using namespace pxr;
+
+namespace blender::render::hydra {
+
+WorldData::WorldData()
+  : shading(nullptr),
+    world(nullptr)
+{
+}
+
+WorldData::WorldData(View3DShading *shading, World *world)
+  : shading(shading),
+    world(world)
+{
+  set_as_world();
+}
+
+std::string WorldData::name()
+{
+  return "";
+}
+
+int WorldData::type()
+{
+  //return object->type;
+  return 0;
+}
+
+TfToken WorldData::prim_type()
+{
+  return HdPrimTypeTokens->domeLight;
+}
+
+GfMatrix4d WorldData::transform()
+{
+  return GfMatrix4d();
+}
+
+VtValue &WorldData::get_data(TfToken const &key)
+{
+  return data[key];
+}
+
+bool WorldData::has_data(TfToken const &key)
+{
+  return data.find(key) != data.end();
+}
+
+void WorldData::update_world()
+{
+  set_as_world();
+}
+
+void WorldData::set_as_world()
+{
+  if (world->use_nodes) {
+
+    bNode *output_node = ntreeShaderOutputNode(world->nodetree, SHD_OUTPUT_ALL);
+    bNodeSocket input_socket = output_node->input_by_identifier("Surface");
+    bNodeLink const *link = input_socket.directly_linked_links()[0];
+    bNode *input_node = link->fromnode;
+
+    bNodeSocket color_input = input_node->input_by_identifier("Color");
+    bNodeSocket strength_input = input_node->input_by_identifier("Strength");
+
+    float const *color = color_input.default_value_typed<float>();
+    float const *strength = strength_input.default_value_typed<float>();
+
+    data[HdLightTokens->intensity] = strength[1];
+    data[HdLightTokens->exposure] = 1.0f;
+    data[HdLightTokens->color] = GfVec3f(color[0], color[1], color[2]);
+
+    //blender::Span<bNode *> world_nodes = world->nodetree->nodes_by_type("ShaderNodeOutputWorld");
+  }
+  else {
+    data[HdLightTokens->intensity] = 1.0f;
+    data[HdLightTokens->exposure] = world->exposure;
+    data[HdLightTokens->color] = GfVec3f(
+        world->horr,
+        world->horg,
+        world->horb
+    );
+  }
+}
+
+void WorldData::set_as_shading()
+{
+  data[HdLightTokens->intensity] = 1.0f;
+  data[HdLightTokens->exposure] = 1.0f;
+  data[HdLightTokens->color] = GfVec3f(
+      shading->single_color[0],
+      shading->single_color[1],
+      shading->single_color[2]
+  );
+}
+
+}  // namespace blender::render::hydra

source/blender/render/hydra/sceneDelegate/world.h

@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
+
+#pragma once
+
+#include <map>
+
+#include <pxr/base/gf/matrix4d.h>
+#include <pxr/usd/sdf/path.h>
+#include <pxr/base/vt/value.h>
+#include "pxr/base/tf/staticTokens.h"
+
+#include "DNA_view3d_types.h"
+#include "DNA_world_types.h"
+
+namespace blender::render::hydra {
+
+class WorldData {
+public:
+  WorldData();
+  WorldData(View3DShading *shading, World *world);
+
+  std::string name();
+  int type();
+  pxr::TfToken prim_type();
+  pxr::GfMatrix4d transform();
+
+  pxr::VtValue &get_data(pxr::TfToken const &key);
+  template<class T>
+  const T &get_data(pxr::TfToken const &key);
+  bool has_data(pxr::TfToken const &key);
+  void update_world();
+
+  View3DShading *shading;
+  World *world;
+
+ private:
+  
+  std::map<pxr::TfToken, pxr::VtValue> data;
+
+  void set_as_world();
+  void set_as_shading();
+};
+
+template<class T>
+const T &WorldData::get_data(pxr::TfToken const &key)
+{
+  return get_data(key).Get<T>();
+}
+
+} // namespace blender::render::hydra