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2 commits

Author SHA1 Message Date
Martin Gräßlin
e1d4d50cd6 Some more optimizations to snow effect:
* move position updates of flakes to shader
* remove the for-loop which updates the flakes. This is handled in the loop for painting the flakes
* Don't test in each frame if a flake is on the screen. Precalculate the number of frames when then flake is on the screen and count the flakes.
* Set PAINT_SCREEN_TRANSFORMED
* Remove all unneeded code (like a QTime object when we already get the time in the method)

Now it takes ~ 17 % of CPU usage on my system. Seems to be the maximum of what is possible.

svn path=/trunk/KDE/kdebase/workspace/; revision=884305
2008-11-14 16:18:34 +00:00
Martin Gräßlin
8ecaefebcc Adding optional shader to snow effect. Shader is used when hardware support is available.
Using shader reduces CPU load from approximately 50 % to less than 20 % on my system.

svn path=/trunk/KDE/kdebase/workspace/; revision=883348
2008-11-12 18:38:36 +00:00