Blender Git Loki

Implement control strands generation for basic hair types along surface normals.

The default hair group type uses vertex normals to generate guide strands automatically.

Cycles tests: add light type tests.

Cycles tests: make page less wide, use relative URLs for serving through http.

Eevee: Convert metallic nodes into princinpled nodes

And wipe metallic out of the map.

Swap Eevee material output with (Cycles) Material Output

Since we started supporting the (Cycles) Material Output old files
stopped working. There is no reason to keep the original Eevee material
otuput anymore.

It includes doversion for old files.

Expose Transparency BSDF for Eevee UI

Uniform Buffer Objects: More complete padding solution

Move floats around when needed to accomodate vec3 arrays efficiently.

With this we use slightly less memory when possible. Basically vec3s are not
treated as vec4 unless we have no float to use for padding).

Reviewers: fclem, sergey

Differential Revision: https://developer.blender.org/D2800

Improved triangulation, working on ring assignments.

First try to apply Lattice GP modifier in all frames

Still not working but define the initial steps to do it.

Eevee: Rework GTAO

This includes big improvement:
- The horizon search is decoupled from the BSDF evaluation. This means using multiple BSDF nodes have a much lower impact when enbaling AO.
- The horizon search is optimized by splitting the search into 4 corners searching similar directions to help which GPU cache coherence.
- The AO options are now uniforms and do not trigger shader recompilation (aka. freeze UI).
- Include a quality slider similar to the SSR one.
- Add a switch for disabling bounce light approximation.
- Fix problem with Bent Normals when occlusion get very dark.
- Add a denoise option to that takes the neighbors pixel values via glsl derivatives. This reduces noise but exhibit 2x2 blocky artifacts.

The downside : Separating the horizon search uses more memory (~3MB for each samples on HD viewport). We could lower the bit depth to 4bit per horizon but it produce noticeable banding (might be fixed with some dithering).

Eevee: Add some utils functions

Eevee: MinmaxZ: Avoid unecessary conversions.

GPU_texture : Add RG8 format.

Eevee: Fix some problem with Glass & Diffuse BSDF with SSR

Diffuse was not outputing the right normal. (this is not a problem with SSR actually)

Glass did not have proper ssr_id and was receiving environment lighting twice.
Also it did not have proper fresnel on lamps.

Fix T52401: "Export Keying Set" operator generated incorrect ID's for shapekeys

To be backported.

Blender 2.79: Point subodules to updated hash

PyAPI: Fix memory leak w/ empty, allocated enums

New VFX Swirl modifier

Fix ubo vec3 alignment issue

This fixes the Principled shader in Eevee, among other nodes.

Basically before we were treating all the vec3 as vec4 as far as memory
goes. We now only do it when required (aka, when the vec3 is not
followed by a float).

We can be even smarter about that and move the floats around to provide
padding for the vec3s. However this is for a separate patch.

That said, there seems to be some strong consensus in corners of the
internet against using vec3 at all [1]. Basically even if we get all the
padding correct, we may still suffer from poor driver implementations in
some consumer graphic cards.

It's not hard to move to vec4, but I think we can avoid doing it as much
as possible. By the time 2.8 is out hopefully most drivers will be
implementing things correctly.

[1] - https://stackoverflow.com/questions/38172696

PyAPI: Gawain checks for range

Raise error on vert-buffer data overflow.
Also exception on attempting to fill data thats already on the GPU.