Code in GPU_buffers_free was already trying to be safe
for threading, by skipping OGL calls there, but in fact
it was still buggy.
Namely, freeing was doing buffers shift in a cycle, and
if two threads will call this function shifting will go
crazy.
Now made it so GPU_buffers_alloc and GPU_buffers_free
are using mutex lock, so they're completely safe for
threading. Same goes to gpu_buffer_setup function.
It required minor functions reshuffle, so there're no
locks happening from locked thread, but it's all very
straightforward change.
textures larger than 2048x2048.
Check if texture is over user preference or GPU limit in texture paint
mode and if it is, scale the partial redraw rectangle before uploading
to GPU. This should be faster than rescaling the whole texture.
the normal towards the viewer, seems to give consistent results with blender
internal, cycles, normal maps, etc.
Started from patch #32761 by Vitor Balbio, but changed it to do normal flipping
earlier so it solves all cases.
draw mode open. OpenGL texture free needs to happen in the main thread, but it was
freeing a copy of the image datablock. I can't understand how this code ever worked,
probably it never did.
window, the game would stop drawing in the first and mess up the OpenGL state of
the second.
Also fixes glPushAttrib/glPopAttrib getting out of sync in some cases.
well as I would like, but it works, just add a subsurface scattering node and
you can use it like any other BSDF.
It is using fully raytraced sampling compatible with progressive rendering
and other more advanced rendering algorithms we might used in the future, and
it uses no extra memory so it's suitable for complex scenes.
Disadvantage is that it can be quite noisy and slow. Two limitations that will
be solved are that it does not work with bump mapping yet, and that the falloff
function used is a simple cubic function, it's not using the real BSSRDF
falloff function yet.
The node has a color input, along with a scattering radius for each RGB color
channel along with an overall scale factor for the radii.
There is also no GPU support yet, will test if I can get that working later.
Node Documentation:
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Shaders#BSSRDF
Implementation notes:
http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/Subsurface_Scattering
brushes, due to issues with color coded drawing or slow/buggy reading from such
a buffer on some systems.
In case multisample is enabled now, it uses an offscreen buffer for such drawing,
which is not multisampled and so should not cause issues. This does mean there is
some extra GPU memory usage when multisample is enabled, and we could optimize
triple buffer to work together here somehow to share buffers, but it's better than
having selection not working.
