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, 15 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_extensions.c b/source/blender/gpu/intern/gpu_extensions.c
index e8fd4b8b8b1..d7ed65e853e 100644
--- a/source/blender/gpu/intern/gpu_extensions.c
+++ b/source/blender/gpu/intern/gpu_extensions.c
@@ -69,6 +69,8 @@ static struct GPUGlobal {
 	GLint maxtexsize;
 	GLint maxcubemapsize;
 	GLint maxtextures;
+	GLint maxubosize;
+	GLint maxubobinds;
 	bool extdisabled;
 	int colordepth;
 	int samples_color_texture_max;
@@ -121,6 +123,16 @@ int GPU_max_cube_map_size(void)
 	return GG.maxcubemapsize;
 }
 
+int GPU_max_ubo_binds(void)
+{
+	return GG.maxubobinds;
+}
+
+int GPU_max_ubo_size(void)
+{
+	return GG.maxubosize;
+}
+
 void GPU_get_dfdy_factors(float fac[2])
 {
 	copy_v2_v2(fac, GG.dfdyfactors);
@@ -154,6 +166,9 @@ void gpu_extensions_init(void)
 	else
 		GG.max_anisotropy = 1.0f;
 
+	glGetIntegerv(GL_MAX_UNIFORM_BUFFER_BINDINGS, &GG.maxubobinds);
+	glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &GG.maxubosize);
+
 	GLint r, g, b;
 	glGetIntegerv(GL_RED_BITS, &r);
 	glGetIntegerv(GL_GREEN_BITS, &g);