Meh, I'll bite and feed the trolls.
So, the feature in question is composing. Composing is here to stay, and it has several backends (in KWin 4): XRender, OpenGL1, OpenGL 2 and OpenGL 3.1 (happily using the last one with the Nouveau drivers )
KWin 5 instead will feature: XRender, OpenGL 2 and OpenGL 3.1.
So it's not right to talk about "removed features", as composing is still here. And anyway, who in this day and age doesn't even support OpenGL 2? If I remember right, KWin also work with OpenGL ES 2, which is a subset of OpenGL 2, and thus supported by even more hardware.
According to Wikipedia, OpenGL 2 got released in 2004. To put it into prospective, It's the year of the Prescot/Northwood Pentium 4, and the first Athlon 64. I seriously doubt even KDE 4 run on those in a decent way.
And anyway, one with hardware this old can disable the various effects (most didn't work with OpenGL 1 anyway) and start using XRender, which is quite efficient.
That said, I'm out of there. Enjoy!
So, the feature in question is composing. Composing is here to stay, and it has several backends (in KWin 4): XRender, OpenGL1, OpenGL 2 and OpenGL 3.1 (happily using the last one with the Nouveau drivers )
KWin 5 instead will feature: XRender, OpenGL 2 and OpenGL 3.1.
So it's not right to talk about "removed features", as composing is still here. And anyway, who in this day and age doesn't even support OpenGL 2? If I remember right, KWin also work with OpenGL ES 2, which is a subset of OpenGL 2, and thus supported by even more hardware.
According to Wikipedia, OpenGL 2 got released in 2004. To put it into prospective, It's the year of the Prescot/Northwood Pentium 4, and the first Athlon 64. I seriously doubt even KDE 4 run on those in a decent way.
And anyway, one with hardware this old can disable the various effects (most didn't work with OpenGL 1 anyway) and start using XRender, which is quite efficient.
That said, I'm out of there. Enjoy!
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