Blender Git Loki

Use an enum for enabled GPU Fx

Forward compatibility: Use triangle strips instead of quads

Cleanup leftover code from WIP renderer

More cleanup

Framebuffer effects:

This includes offscreen processing for the 3D viewport and OpenGL rendering.

Included effects are a depth of field shader and a Screen Space Ambient
Occlusion shader.

The system is simplistic and duplicates some code. I am in the process of making abstractions
so the effects can be used in a node system, but we can probably give users
access to the early system right now.

Reviewers: sergey, campbellbarton, jwilkins, merwin

Differential Revision: https://developer.blender.org/D1092

Cleanup - bring branch to merge ready condition

Merge branch 'master' into viewport_experiments

Merge branch 'master' into viewport_experiments

Conflicts:
CMakeLists.txt

Cleanup for compositing, move to c++ WIP node abstractions for compositing system.

Select appropriate folder for MinGW-w64 gcc 4.9

Fix T43208 material flickering in edit mode.

Happens because material setting now occurs in the derived mesh drawing
routine as it should. However that means that it also happens during
selection and that influenced the drawing state somehow.

In 2.72 this did not occur because material setting happened during draw
setting (skip or draw) instead of after the draw setting passed (so
selection would skip it by use another draw setting function). Of course
this violated design but worked.

Made it now so backbuffer selection does not enable materials (it's
redundant in those cases anyway).

This could be ported to a possible 'a' release but as is classic with
display code there may be some other places that it could backfire.

Tested fix with texture/vertex painting and selection which use
backbuffer for both subsurf and regular meshes and it seems to work OK.

Add initial compositing node API, compositing code already becomes too
redundant and hard for prototyping. This will make things easier.

Merge branch 'master' into viewport_experiments

fragment shader to downsample near circle of confusion - rename texture
coordinates so it's clearer they are reusable.

signed coc matches the low quality one.

As usually hard to find errors are usually quite silly. We can now see
the coc value

Intermediate commit.

Basically, we try to output coc values to a second render target, but
apparently OpenGL somehow hates us. Committing so that Mac may give a
better diagnostic on what is happening.

First stage of better dof, downsample buffer by half.

Add new shader files to Scons

WIP for new dof