Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/hydra/file_reader.cpp

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+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#include "hydra/file_reader.h"
+#include "hydra/camera.h"
+#include "hydra/render_delegate.h"
+
+#include "util/log.h"
+#include "util/path.h"
+#include "util/unique_ptr.h"
+
+#include "scene/scene.h"
+
+#include <pxr/base/plug/registry.h>
+#include <pxr/imaging/hd/flatteningSceneIndex.h>
+#include <pxr/imaging/hd/legacyTaskFactory.h>
+#include <pxr/imaging/hd/legacyTaskSchema.h>
+#include <pxr/imaging/hd/mergingSceneIndex.h>
+#include <pxr/imaging/hd/renderDelegate.h>
+#include <pxr/imaging/hd/renderIndex.h>
+#include <pxr/imaging/hd/retainedDataSource.h>
+#include <pxr/imaging/hd/retainedSceneIndex.h>
+#include <pxr/imaging/hd/rprimCollection.h>
+#include <pxr/imaging/hd/task.h>
+#include <pxr/imaging/hd/tokens.h>
+#include <pxr/imaging/hdsi/extComputationPrimvarPruningSceneIndex.h>
+#include <pxr/imaging/hdsi/legacyDisplayStyleOverrideSceneIndex.h>
+#include <pxr/usd/usd/primRange.h>
+#include <pxr/usd/usd/stage.h>
+#include <pxr/usd/usdGeom/camera.h>
+#include <pxr/usd/usdGeom/metrics.h>
+#include <pxr/usdImaging/usdImaging/flattenedDataSourceProviders.h>
+#include <pxr/usdImaging/usdImaging/materialBindingsResolvingSceneIndex.h>
+#include <pxr/usdImaging/usdImaging/stageSceneIndex.h>
+
+HDCYCLES_NAMESPACE_OPEN_SCOPE
+
+/* Dummy task whose only purpose is to provide render tag tokens to the render index. */
+class DummyHdTask : public HdTask {
+ public:
+  DummyHdTask(HdSceneDelegate * /*delegate*/, const SdfPath &id)
+      : HdTask(id), tags({HdRenderTagTokens->geometry, HdRenderTagTokens->render})
+  {
+  }
+
+ protected:
+  void Sync(HdSceneDelegate * /*delegate*/,
+            HdTaskContext * /*ctx*/,
+            HdDirtyBits * /*dirtyBits*/) override
+  {
+  }
+
+  void Prepare(HdTaskContext * /*ctx*/, HdRenderIndex * /*render_index*/) override {}
+
+  void Execute(HdTaskContext * /*ctx*/) override {}
+
+  const TfTokenVector &GetRenderTags() const override
+  {
+    return tags;
+  }
+
+  TfTokenVector tags;
+};
+
+void HdCyclesFileReader::read(Session *session, const char *filepath, const bool use_camera)
+{
+  /* Initialize USD. */
+  PlugRegistry::GetInstance().RegisterPlugins(path_get("usd"));
+
+  /* Open Stage. */
+  const UsdStageRefPtr stage = UsdStage::Open(filepath);
+  if (!stage) {
+    LOG_ERROR << "USD failed to read " << filepath;
+    return;
+  }
+
+  /* Init paths. */
+  const SdfPath root_path = SdfPath::AbsoluteRootPath();
+  const SdfPath task_path("/_hdCycles/DummyHdTask");
+
+  /* Create render delegate. */
+  HdRenderSettingsMap settings_map;
+  settings_map.insert(std::make_pair(HdCyclesRenderSettingsTokens->stageMetersPerUnit,
+                                     VtValue(UsdGeomGetStageMetersPerUnit(stage))));
+
+  HdCyclesDelegate render_delegate(settings_map, session, true);
+
+  /* Create render index. */
+  unique_ptr<HdRenderIndex> render_index(HdRenderIndex::New(&render_delegate, {}));
+
+  /* Set up scene index from USD stage for easy consumption.
+   * Do ext computation (e.g. skinning), flattening and resolve material bindings. */
+  UsdImagingStageSceneIndexRefPtr stage_si = UsdImagingStageSceneIndex::New(nullptr);
+  stage_si->SetStage(stage);
+  stage_si->SetTime(UsdTimeCode::Default());
+
+  HdSceneIndexBaseRefPtr filtered = stage_si;
+  filtered = HdSiExtComputationPrimvarPruningSceneIndex::New(filtered);
+  filtered = HdFlatteningSceneIndex::New(filtered, UsdImagingFlattenedDataSourceProviders());
+  filtered = UsdImagingMaterialBindingsResolvingSceneIndex::New(filtered, nullptr);
+
+  /* Provide DummyHdTask as a task prim to the scene index. */
+  HdRprimCollection collection(HdTokens->geometry, HdReprSelector(HdReprTokens->smoothHull));
+  collection.SetRootPath(root_path);
+
+  const TfTokenVector render_tags = {HdRenderTagTokens->geometry, HdRenderTagTokens->render};
+
+  HdContainerDataSourceHandle task_ds =
+      HdLegacyTaskSchema::Builder()
+          .SetFactory(HdRetainedTypedSampledDataSource<HdLegacyTaskFactorySharedPtr>::New(
+              HdMakeLegacyTaskFactory<DummyHdTask>()))
+          .SetCollection(HdRetainedTypedSampledDataSource<HdRprimCollection>::New(collection))
+          .SetRenderTags(HdRetainedTypedSampledDataSource<TfTokenVector>::New(render_tags))
+          .Build();
+
+  HdRetainedSceneIndexRefPtr task_si = HdRetainedSceneIndex::New();
+  task_si->AddPrims(
+      {{task_path,
+        HdPrimTypeTokens->task,
+        HdRetainedContainerDataSource::New(HdLegacyTaskSchema::GetSchemaToken(), task_ds)}});
+
+  HdMergingSceneIndexRefPtr merging_si = HdMergingSceneIndex::New();
+  merging_si->AddInputScene(filtered, root_path);
+  merging_si->AddInputScene(task_si, root_path);
+
+  const bool needs_prefixing = false;
+  render_index->InsertSceneIndex(merging_si, root_path, needs_prefixing);
+
+  stage_si->ApplyPendingUpdates();
+
+  render_index->EnqueueCollectionToSync(collection);
+
+  /* Sync prims. */
+  HdTaskContext task_context;
+  HdTaskSharedPtrVector tasks;
+  if (HdTaskSharedPtr const &task = render_index->GetTask(task_path)) {
+    tasks.push_back(task);
+  }
+
+  render_index->SyncAll(&tasks, &task_context);
+  render_delegate.CommitResources(&render_index->GetChangeTracker());
+
+  /* Use first camera in stage.
+   * TODO: get camera from UsdRender if available. */
+  if (use_camera) {
+    for (const UsdPrim &prim : stage->Traverse()) {
+      if (prim.IsA<UsdGeomCamera>()) {
+        HdSprim *sprim = render_index->GetSprim(HdPrimTypeTokens->camera, prim.GetPath());
+        if (sprim) {
+          HdCyclesCamera *camera = dynamic_cast<HdCyclesCamera *>(sprim);
+          camera->ApplyCameraSettings(render_delegate.GetRenderParam(), session->scene->camera);
+          break;
+        }
+      }
+    }
+  }
+}
+
+HDCYCLES_NAMESPACE_CLOSE_SCOPE