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, 58 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/writefile.c b/source/blender/blenloader/intern/writefile.c
index 4ddf83d306b..0ad879b9aa6 100644
--- a/source/blender/blenloader/intern/writefile.c
+++ b/source/blender/blenloader/intern/writefile.c
@@ -1894,6 +1894,8 @@ static void write_objects(WriteData *wd, ListBase *idbase)
 
 			writelist(wd, DATA, LinkData, &ob->pc_ids);
 			writelist(wd, DATA, LodLevel, &ob->lodlevels);
+
+			ob->collection_settings = NULL;
 		}
 
 		write_previews(wd, ob->preview);
@@ -2469,6 +2471,21 @@ static void write_textures(WriteData *wd, ListBase *idbase)
 	mywrite_flush(wd);
 }
 
+static void write_material_engines_settings(WriteData *wd, ListBase *lb)
+{
+	for (MaterialEngineSettings *res = lb->first; res; res = res->next) {
+		writestruct(wd, DATA, MaterialEngineSettings, 1, res);
+
+		if (STREQ(res->name, RE_engine_id_BLENDER_CLAY)) {
+			writestruct(wd, DATA, MaterialEngineSettingsClay, 1, res->data);
+		}
+		else {
+			/* No engine matched */
+			/* error: don't know how to write this file */
+		}
+	}
+}
+
 static void write_materials(WriteData *wd, ListBase *idbase)
 {
 	Material *ma;
@@ -2505,6 +2522,8 @@ static void write_materials(WriteData *wd, ListBase *idbase)
 			}
 
 			write_previews(wd, ma->preview);
+
+			write_material_engines_settings(wd, &ma->engines_settings);
 		}
 		ma = ma->id.next;
 	}
@@ -2639,6 +2658,26 @@ static void write_scene_collection(WriteData *wd, SceneCollection *sc)
 	}
 }
 
+static void write_collection_engine_settings(WriteData *wd, ListBase *lb)
+{
+	for (CollectionEngineSettings *ces = lb->first; ces; ces = ces->next) {
+		writestruct(wd, DATA, CollectionEngineSettings, 1, ces);
+
+		for (CollectionEngineProperty *prop = ces->properties.first; prop; prop = prop->next) {
+			switch (prop->type) {
+			    case COLLECTION_PROP_TYPE_FLOAT:
+				    writestruct(wd, DATA, CollectionEnginePropertyFloat, 1, prop);
+				    break;
+			    case COLLECTION_PROP_TYPE_INT:
+				    writestruct(wd, DATA, CollectionEnginePropertyInt, 1, prop);
+				    break;
+			    default:
+				    ; /* error: don't know how to write this file */
+			}
+		}
+	}
+}
+
 static void write_layer_collections(WriteData *wd, ListBase *lb)
 {
 	for (LayerCollection *lc = lb->first; lc; lc = lc->next) {
@@ -2647,10 +2686,27 @@ static void write_layer_collections(WriteData *wd, ListBase *lb)
 		writelist(wd, DATA, LinkData, &lc->object_bases);
 		writelist(wd, DATA, CollectionOverride, &lc->overrides);
 
+		write_collection_engine_settings(wd, &lc->engine_settings);
+
 		write_layer_collections(wd, &lc->layer_collections);
 	}
 }
 
+static void write_render_engines_settings(WriteData *wd, ListBase *lb)
+{
+	for (RenderEngineSettings *res = lb->first; res; res = res->next) {
+		writestruct(wd, DATA, RenderEngineSettings, 1, res);
+
+		if (STREQ(res->name, RE_engine_id_BLENDER_CLAY)) {
+			writestruct(wd, DATA, RenderEngineSettingsClay, 1, res->data);
+		}
+		else {
+			/* No engine matched */
+			/* error: don't know how to write this file */
+		}
+	}
+}
+
 static void write_scenes(WriteData *wd, ListBase *scebase)
 {
 	Scene *sce;
@@ -2880,6 +2936,8 @@ static void write_scenes(WriteData *wd, ListBase *scebase)
 			write_layer_collections(wd, &sl->layer_collections);
 		}
 
+		write_render_engines_settings(wd, &sce->engines_settings);
+
 		sce = sce->id.next;
 	}