Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/hydra/addon/__init__.py

@@ -0,0 +1,87 @@
+# SPDX-FileCopyrightText: 2026 Blender Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Basic add-on for the Cycles Hydra render delegate. This is very incomplete
+# and intended for developer testing only. The most obvious limitation is that
+# materials and render settings are not supported.
+
+import bpy
+
+bl_info = {
+    "name": "Hydra Cycles render engine",
+    "author": "Blender Foundation",
+    "version": (0, 1, 0),
+    "blender": (5, 0, 0),
+    "description": "Cycles path tracing renderer using the Hydra render delegate",
+    "support": 'OFFICIAL',
+    "category": "Render",
+}
+
+
+class CyclesHydraRenderEngine(bpy.types.HydraRenderEngine):
+    bl_idname = 'HYDRA_CYCLES'
+    bl_label = "Hydra Cycles"
+    bl_info = "Cycles path tracing renderer using the Hydra render delegate"
+
+    bl_use_preview = False
+    bl_use_gpu_context = False
+    bl_use_materialx = False
+
+    bl_delegate_id = 'HdCyclesPlugin'
+
+    @classmethod
+    def register(cls):
+        bpy.utils.expose_bundled_modules()
+
+        import os
+        plugin_dir = os.path.normpath(
+            os.path.join(os.path.dirname(__file__), "..", "cycles", "hydra")
+        )
+        if not os.path.isfile(os.path.join(plugin_dir, "plugInfo.json")):
+            print("Hydra Cycles: plugInfo.json not found at", plugin_dir)
+            return
+
+        import pxr.Plug
+        pxr.Plug.Registry().RegisterPlugins([plugin_dir])
+
+    def get_render_settings(self, engine_type):
+        cscene = bpy.context.scene.cycles
+        samples = cscene.preview_samples if engine_type == 'VIEWPORT' else cscene.samples
+        result = {'cycles:samples': samples}
+        if engine_type != 'VIEWPORT':
+            result |= {
+                'aovToken:Combined': "color",
+                'aovToken:Depth': "depth",
+            }
+        return result
+
+    def update_render_passes(self, scene, render_layer):
+        if render_layer.use_pass_combined:
+            self.register_pass(scene, render_layer, 'Combined', 4, 'RGBA', 'COLOR')
+        if render_layer.use_pass_z:
+            self.register_pass(scene, render_layer, 'Depth', 1, 'Z', 'VALUE')
+
+
+def _shared_panels():
+    # Use all the same panels as regular Cycles, even if most options are
+    # currently not supported. But for the ones that are supported it's not
+    # worth making custom panels just for developer testing.
+    for panel in bpy.types.Panel.__subclasses__():
+        engines = getattr(panel, 'COMPAT_ENGINES', None)
+        if engines and 'CYCLES' in engines:
+            yield panel
+
+
+def register():
+    bpy.utils.register_class(CyclesHydraRenderEngine)
+
+    for panel in _shared_panels():
+        panel.COMPAT_ENGINES.add(CyclesHydraRenderEngine.bl_idname)
+
+
+def unregister():
+    for panel in _shared_panels():
+        panel.COMPAT_ENGINES.discard(CyclesHydraRenderEngine.bl_idname)
+
+    bpy.utils.unregister_class(CyclesHydraRenderEngine)