Many thanks to all you developers and testers for
creating an extremely simple, elegant library. It
took me no time to get up to speed with SDL. I also
found #sdl on irc to be very helpful.
I’m currently using SDL for movie playback in a
window, and the frames are quite large. Because the
movies are spooled across the network via NFS, I’ve
got a ring buffer of surfaces, where each surface is
created using SDL_CreateRGBSurface. This buffer
allows my decoder to run ahead of playback so that I
can tolerate variable latencies in the network and/or
Unfortunately, due to the large frame sizes, the extra
blit from each surface into the “video” surface
created with SDL_SetVideoMode is impacting the
framerate by as much as 20% for some flicks. What I
want is to create a ring of multiple MIT-SHM surfaces
like the one returned by SDL_SetVideoMode, and have
the decoder go around the ring writing pixels into
each one; while a display thread/signal/whatever wakes
up approx. every 24th of a second and calls
SDL_UpdateRect(surfaces[current_frame], …). This
way I can avoid the extra blit, since I’m writing into
surfaces which can be read directly by the X server.
I think I know how to do this for X11, at least.
Unfortunately, I don’t have access to machines or time
enough to do it for other platforms. Does anyone
already have plans for this type of thing in 1.2? If
not, I’ll give it a shot. Suggestions and/or advice
on how to go about doing it are welcome.
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