[CinCV TNG] Updated GreyCStoration plugin

Einar R√ľnkaru einarry at smail.ee
Fri Apr 10 09:33:45 CEST 2015


Hi.

On Fri, Apr 10, 2015 at 12:08 AM, edouard chalaron
<e.chalaron at xtra.co.nz> wrote:
> Hello All
> Am I wrong by understanding that Intel CPUs have a GPU unit embedded (like
> AMD and Radeon) ?

CPU (the chip) may have GPU embedded - depends on the exact type of
CPU. Usually GPU is a separate chip on motherboard or an add-on card.

> If yes is OpenGL then supported ?

Yes.

But OpenGL is a set of features. The idea of OpenGL is to draw
something in video memory under the control of CPU. Example: draw a
rectangle and fill it with some color. The useful features of OpenGL
are more complex of course.

Cinelerra uses a certain feature of OpenGL (PBuffer) to display a
frame. When hardware+driver support this feature Cinelerra may use it.
When PBuffer feature does not exist or does not work as Cinelerra
expects, OpenGL is useless for Cinelerra.

Some plugins use OpenGL to render effects directly to displayed frame,
when OpenGL is in use. This increases display speed, but there may be
differences in displyed effect and the final rendered result.

On my hardware PBuffer does not work though the info functions tell,
that the feature exists and is useable. Most of other OpenGL
freatures, I was able to test, worked.

I recently upgraded my system and have not tested the current state.
So I can't fix or test the OpenGL features of Cinelerra today.

Einar


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