Blender Git Loki

Custom color for SSAO

Do not calculate SSAO on the background. Saves cycles on pixel shaders
as well as solves issue with SSAO artifacts around grids.

fix issue with scons

WIP, beginning of renderer system that should take care of sorting
materials properly for rendering.

-Need to check aspect system first before going too much into this-

Hook up flags to request a specific sorting scheme from GPU buffer setup
routines. (still inactive
)

Fix issue with sculpting and SSAO.

We need to enable stenciling on the compositing FBO or we can clear
areas we don't want to clear and cause invalid depth values.

Restore texture coordinates properly

Merge branch 'master' into viewport_experiments

Fix for flickering, recreate the framebuffer textures in that case
(looks like it's the only way to have matching per pixel results too)

Move GPU compositing to its own file.

Also avoid recreating the framebuffers and gpu/color textures each
frame.

Happiness :)

There are still some glithes when scaling the areas, I'll look at those
next.

SSAO

* Expose attenuation value - allows to change influence of far objects
* Change influence of far objects to quadratic, eliminates some extreme
fringing from far occluding surfaces.

SSAO shader.

This works by using the calculated view space normal and accumulating
coverage of a certain area by nearby pixels. There are two sliders to
control the effect:

* Scale controls the area around each pixel that the shader "collides"
against
* Darkening scales the occlusion effect.

The effect works, but due to the way the normals are calculated, the
normals are never smooth shaded (that would require a separate render
target to store them) and the edges or polygons can be too apparent.
This is not really fixable at the moment unless we move to deferred
pipeline.

The FX system is stll not well optimized and rendering does not always
work correctly, but it's good to have this out for people to play with.

Greatly improved normal calculation using view space position
derivatives.

Framebuffer FX.

This commit introduces offscreen rendering for the 3D viewport.
There is test code that calculates depth and normal data
in screen space.

Currently just DOF is supported with a few parameters to control the
effect

This code recreates the framebuffer and texture objects every frame
which will make it -slow-. Use at your own risk.