This is still not so correct, to make it work we really have to do a
blurring pass based on the real coc (currently we are just blending 3
levels of blur)
- spiral scheme is much more intuitive here. Also use float number for
spirals to avoid having samples on the same radial direction when sample
number is divisible by spiral number.
Basically, before drawing X-Rays, we now bind a second depth buffer.
After drawing XRays, we do an extra resolve pass where we overwrite the
non-XRay depth buffer in pixels where the depth is not maximum (which
means background pixel, since depth is cleared before drawing X-Ray
objects).
This ensures both scene and X-Rays keep their depth values and are ready
for compositing. Well, the odd effect due to depth discontinuities can be
expected, and X-Rays are a bit more expensive (extra buffer + resolve pass)
but at least X-Rays won't invalidate depth values anymore. Whee!
background.
For SSAO supporting this is no problem, for DOF we would ideally do
blurred alpha, but alpha channel in blurred buffers is occupied by coc
field, so use original color alpha instead. It's not entirely correct
but it's better than nothing.
This commit introduces a few ready made effects for the 3D viewport
and OpenGL rendering.
Included effects are Depth of Field, accessible from camera view
and screen space ambient occlusion. Those effects can be turned on and
tweaked from the shading panel in the 3D viewport.
Off screen rendering will use the settings of the current camera.
WIP documentation can be found here:
http://wiki.blender.org/index.php/User:Psy-Fi/Framebuffer_Post-processing
