Hi I am trying to use HW_SURFACE to display some
video. I have a GForce 2 GTS gfx card with the latest
nvidia drivers on a Red Hat 7.2 system. This should
have HW overlay capabilites. The hw_available flag in
the SDL_VideoInfo structure returned from
SDL_GetVideoInfo() is always set to 0. Do I need to
install something else to enable this capability?
When I call SetVideoMode with with either HW_SURFACE
or SW_SURFACE I see no difference in performance.
thanks for your help
birju__________________________________________________
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Hi I am trying to use HW_SURFACE to display some
video. I have a GForce 2 GTS gfx card with the latest
nvidia drivers on a Red Hat 7.2 system. This should
have HW overlay capabilites. The hw_available flag in
the SDL_VideoInfo structure returned from
SDL_GetVideoInfo() is always set to 0. Do I need to
install something else to enable this capability?
When I call SetVideoMode with with either HW_SURFACE
or SW_SURFACE I see no difference in performance.
http://www.libsdl.org/pipermail/sdl/2002-May/045915.html
–ryan.
There is actually a massive performance difference.
If you do all writes to video memory it is fine.
Current generation processors use write combining
buffers to write to AGP memory. However reads are
still painfully slow. For most video decoders and
graphics apps you never read from video memory. For
my non optimized decoder I get a frame rate of 29 FPS
when I do not display (very little time in memcpy from
pixel buffer to video memory). If I display I get 17
FPS. When I display almost 40% of the time is spent
in memcpy. If I could write directly to the frame HW
buffer than none of these memcpys would be required.
The code I wrote works on windows and linux. Because
I can write directly to the HW frame buffer in windows
the performance is much better. That said, do you
know of anyway to access the HW frame buffer directly?
thanks
birju
— “Ryan C. Gordon”
wrote:
Hi I am trying to use HW_SURFACE to display some
video. I have a GForce 2 GTS gfx card with the
latest
nvidia drivers on a Red Hat 7.2 system. This
should
have HW overlay capabilites. The hw_available
flag in
the SDL_VideoInfo structure returned from
SDL_GetVideoInfo() is always set to 0. Do I need
to
install something else to enable this capability?
When I call SetVideoMode with with either
HW_SURFACE
or SW_SURFACE I see no difference in performance.
http://www.libsdl.org/pipermail/sdl/2002-May/045915.html>
–ryan.
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http://www.libsdl.org/mailman/listinfo/sdl
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