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, 40 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_material_types.h b/source/blender/makesdna/DNA_material_types.h
index 0c500e366a7..bd8278f897a 100644
--- a/source/blender/makesdna/DNA_material_types.h
+++ b/source/blender/makesdna/DNA_material_types.h
@@ -90,6 +90,43 @@ typedef struct TexPaintSlot {
 	int pad;
 } TexPaintSlot;
 
+/* Material Engine Settings */
+typedef struct MaterialEngineSettings {
+	struct MaterialEngineSettings *next, *prev;
+	char name[32]; /* engine name - MAX_NAME */
+	void *data;
+} MaterialEngineSettings;
+
+/* Clay engine */
+
+/* MaterialRuntimeClay.flag */
+#define CLAY_OUTDATED		1
+
+typedef struct MaterialEngineSettingsClay {
+	short type;
+	short matcap_icon; /* Icon ID */
+
+	float matcap_rot;
+	float matcap_hue;
+	float matcap_sat;
+	float matcap_val;
+
+	float ssao_distance;
+	float ssao_attenuation;
+	float ssao_factor_cavity;
+	float ssao_factor_edge;
+
+	/* Runtime */
+	short flag;
+	short pad;
+	int ubo_index;
+} MaterialEngineSettingsClay;
+
+/* MaterialEngineSettingsClay.type */
+#define CLAY_MATCAP_NONE		0
+#define CLAY_MATCAP_SIMPLE		1
+#define CLAY_MATCAP_COMPLETE	2
+
 typedef struct Material {
 	ID id;
 	struct AnimData *adt;	/* animation data (must be immediately after id for utilities to use it) */ 
@@ -203,6 +240,9 @@ typedef struct Material {
 
 	struct TexPaintSlot *texpaintslot; /* cached slot for painting. Make sure to recalculate before use
 	                                    * with refresh_texpaint_image_cache */
+	/* Engine Settings */
+	ListBase engines_settings; /* MaterialEngineSettings */
+
 	ListBase gpumaterial;		/* runtime */
 } Material;