Different surface types
brian.paul at tungstengraphics.com
Sat Apr 30 12:18:50 PDT 2005
Jon Smirl wrote:
> In the standalone OpenGL case where should these surfaces get created?
> eglCreatePixmapSurface and eglCreateWindowSurface don't apply since
> there are no native Pixmap and Window types in the standalone case. So
> that leaves eglCreateScreenSurfaceMESA, it always has to do into VRAM.
> I guess eglCreatePbufferSurface means it can go in VRAM or AGP?
Or plain RAM if need be.
> Can Pbuffer migrate between area?
Nothing in the spec prevents that.
> Can ScreenSurface migrate if it is not attached to an active screen?
I would think so.
> Would the standalone world be simpler if there was just one kind of
> surface that migrated to VRAM if it is going to be used?
I don't know. But I like the idea of separate types/functions for
Pbuffers and screen surfaces because PBuffers have traditionally
always been known as off-screen surfaces and there's some pbuffer
operations (such as binding to textures) which don't seem appropriate
for screen surfaces.
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