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Unfortunately this does break compatibility in that the viewport will look a
bit different depending on the settings, but the old behavior was simply not
usable for higher distances.
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an unused coordinate missing.
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and on screen rendering.
Aaaaah, the beauty of driver implementations of OpenGL!
Turns out the problem here is that drivers calculate df/dy differently
in some cases (probably because OpenGL counts y reverse to how the
window system does, so drivers can get confused).
Fixed this for the ATI case based on info we have so far, there's also
the Intel case which will be handled separately (missing info on Intel's
renderer string etc).
Unfortunately we can't really fix this for the general case so we'll
have to haldle cases as they come in our tracker and by adding silly
string comparisons in our GPU initialization module <sigh>.
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Previous behaviour would get occlusion at borders which could create
over occlusion at edges of the screen.
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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.
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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
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