Clay-Engine (merge clay-engine)

Initial work by Clément Foucault with contributions from Dalai Felinto
(mainly per-collection engine settings logic, and depsgraph iterator placeholder).

This makes Blender require OpenGL 3.3. Which means Intel graphic card
and OSX will break. Disable CLAY_ENGINE in CMake in those cases.

This is a prototype render engine intended to help the design of real
render engines. This is mainly an engine with enphasis in matcap and
ambient occlusion.

Implemented Features
--------------------

* Clay Render Engine, following the new API, to be used as reference for
future engines

* A more complete Matcap customization with more options

* Per-Collection render engine settings

* New Ground Truth AO - not enabled

Missing Features
----------------

* Finish object edit mode
  - Fix shaders to use new matrix
  - Fix artifacts when edge does off screen
  - Fix depth issue
  - Selection sillhouette
  - Mesh wires
  - Use mesh normals (for higher quality matcap)
  - Non-Mesh objects drawing
  - Widget drawing
  - Performance issues

* Finish mesh edit mode
  - Derived-Mesh-less edit mode API (mesh_rende.c)

* General edit mode
  - Per-collection edit mode settings

* General engines
  - Per-collection engine settings
    (they are their, but they still need to be flushed by depsgraph, and
    used by the drawing code)

1 files changed, 49 insertions, 0 deletions

diff --git a/release/scripts/startup/bl_ui/properties_collection.py b/release/scripts/startup/bl_ui/properties_collection.py
index d67d694aec9..88d78f98ef2 100644
--- a/release/scripts/startup/bl_ui/properties_collection.py
+++ b/release/scripts/startup/bl_ui/properties_collection.py
@@ -75,5 +75,54 @@ class COLLECTION_PT_objects(CollectionButtonsPanel, Panel):
         row.operator("collections.objects_deselect", text="Deselect")
 
 
+def template_engine_settings(col, settings, name, use_icon_view=False):
+    icons = {
+            False: 'ZOOMIN',
+            True: 'X',
+            }
+
+    use_name = "{0}_use".format(name)
+    use = getattr(settings, use_name)
+
+    row = col.row()
+    col = row.column()
+    col.active = use
+
+    if use_icon_view:
+        col.template_icon_view(settings, name)
+    else:
+        col.prop(settings, name)
+
+    row.prop(settings, "{}_use".format(name), text="", icon=icons[use], emboss=False)
+
+
+class COLLECTION_PT_clay_settings(CollectionButtonsPanel, Panel):
+    bl_label = "Render Settings"
+    COMPAT_ENGINES = {'BLENDER_CLAY'}
+
+    @classmethod
+    def poll(cls, context):
+        scene = context.scene
+        return scene and (scene.render.engine in cls.COMPAT_ENGINES)
+
+    def draw(self, context):
+        layout = self.layout
+
+        collection = context.layer_collection
+        settings = collection.get_engine_settings()
+
+        col = layout.column()
+        template_engine_settings(col, settings, "type")
+        template_engine_settings(col, settings, "matcap_icon", use_icon_view=True)
+        template_engine_settings(col, settings, "matcap_rotation")
+        template_engine_settings(col, settings, "matcap_hue")
+        template_engine_settings(col, settings, "matcap_saturation")
+        template_engine_settings(col, settings, "matcap_value")
+        template_engine_settings(col, settings, "ssao_factor_cavity")
+        template_engine_settings(col, settings, "ssao_factor_edge")
+        template_engine_settings(col, settings, "ssao_distance")
+        template_engine_settings(col, settings, "ssao_attenuation")
+
+
 if __name__ == "__main__":  # only for live edit.
     bpy.utils.register_module(__name__)