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, 44 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_uniformbuffer.h b/source/blender/gpu/GPU_uniformbuffer.h
new file mode 100644
index 00000000000..bcb6e1077b7
--- /dev/null
+++ b/source/blender/gpu/GPU_uniformbuffer.h
@@ -0,0 +1,44 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2005 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Clement Foucault.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file GPU_uniformbuffer.h
+ *  \ingroup gpu
+ */
+
+typedef struct GPUUniformBuffer GPUUniformBuffer;
+
+GPUUniformBuffer *GPU_uniformbuffer_create(int size, const void *data, char err_out[256]);
+void GPU_uniformbuffer_free(GPUUniformBuffer *ubo);
+
+void GPU_uniformbuffer_update(GPUUniformBuffer *ubo, const void *data);
+
+void GPU_uniformbuffer_bind(GPUUniformBuffer *ubo, int number);
+#if 0 
+void GPU_uniformbuffer_unbind(GPUUniformBuffer *ubo);
+#endif
+
+int GPU_uniformbuffer_bindpoint(GPUUniformBuffer *ubo);