On Wed, 2009-10-07 at 22:03 +1100, Scott Hamilton wrote:
On a final note, I did a 'make distclean' and ./configure for both
SimGear and FlightGear and now
the change in frame rate is acceptable, it goes from 30 fps to around
22 - 24 fps once 3D clouds are turned on.
S.
> On Wed, 2009-10-07 at 09:18 +0000, Stuart Buchanan wrote:
>
> > Scott Hamilton wrote:
> > >On Tue, 2009-10-06 at 22:06 -0400, William Harrison wrote:
> > >
> > >>> Maybe it's just me, but has anyone noticed a dramatic performance
> > >>> decrease with 3d clouds after this patch?
> > >>
> > >> yep, from 30fps to 2fps...
>
>
>
> OK, I hope this reproducer scenario helps;
>
> 1. don't turn on 3D clouds from command line, don't specify any
> weather (manual metar), default; scattered at 4000ft and cirrus at
> 19500
> 25-31fps
>
> 2. go into rendering options, turn on 3D clouds
> 2-3fps
>
> 3. change 19500 from cirrus to clear
> 2-6fps
>
> 4. change 4000 from scattered to few
> remains 2-6 fps
>
> 5. change 4000 from few to clear
> 20-24fps
>
> 6. turn OFF 3D clouds (so there is no 3D or 2D clouds)
> 23-26fps
>
> I last built fgfs 2009-10-03 19:23 (Sydney time)
> I've now done a cvs update and 'make clean' on SimGear and FlightGear
> and updated data/Shaders/
>
> 1. same as a above. The cmd line is; bin/fgfs --enable-sound
> --enable-hud --aircraft=A380 --airport=YSSY --runway=34L
> --timeofday=afternoon
> 28-32fps
>
> 2. go into rendering options, turn ON 3D clouds
> 7 fps
>
> 3. change 19500 from cirrus to clear
> remains 7fps
>
> 4. change 4000 from scattered to few
> 10-11fps
>
> 5. change 4000 from few to clear
> 23-27fps
>
> 6. turn OFF 3D clouds
> remains 23-27fps
>
>
> Operating System: openSuSE 11.1 (kernel2.6.27.29-0.1-default )
> Model: "nVidia Quadro FX 580"
>
> I'm assuming shaders need some OpenGL help;
>
> # glxinfo
> name of display: :0.0
> display: :0 screen: 0
> direct rendering: Yes
> server glx vendor string: NVIDIA Corporation
> server glx version string: 1.4
> server glx extensions:
> GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
> GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control,
> GLX_EXT_texture_from_pixmap, GLX_ARB_create_context,
> GLX_ARB_multisample,
> GLX_NV_float_buffer, GLX_ARB_fbconfig_float,
> GLX_NV_swap_group,
> GLX_EXT_framebuffer_sRGB,
> GLX_NV_multisample_coverage
> client glx vendor string: NVIDIA
> Corporation
> client glx version string:
> 1.4
> client glx
> extensions:
> GLX_ARB_get_proc_address, GLX_ARB_multisample,
> GLX_EXT_visual_info,
> GLX_EXT_visual_rating, GLX_EXT_import_context,
> GLX_SGI_video_sync,
> GLX_NV_swap_group, GLX_NV_video_out, GLX_SGIX_fbconfig,
> GLX_SGIX_pbuffer,
> GLX_SGI_swap_control, GLX_ARB_create_context,
> GLX_NV_float_buffer,
> GLX_ARB_fbconfig_float,
> GLX_EXT_fbconfig_packed_float,
> GLX_EXT_texture_from_pixmap,
> GLX_EXT_framebuffer_sRGB,
> GLX_NV_present_video,
> GLX_NV_multisample_coverage
> GLX
> extensions:
> GLX_EXT_visual_info, GLX_EXT_visual_rating,
> GLX_SGIX_fbconfig,
> GLX_SGIX_pbuffer, GLX_SGI_video_sync,
> GLX_SGI_swap_control,
> GLX_EXT_texture_from_pixmap, GLX_ARB_create_context,
> GLX_ARB_multisample,
> GLX_NV_float_buffer, GLX_ARB_fbconfig_float,
> GLX_NV_swap_group,
> GLX_EXT_framebuffer_sRGB,
> GLX_NV_multisample_coverage,
>
> GLX_ARB_get_proc_address
> OpenGL vendor string: NVIDIA
> Corporation
> OpenGL renderer string: Quadro FX
> 580/PCI/SSE2
> OpenGL version string: 3.0.0 NVIDIA 180.44
>
>
>
> I hope something here helps, as they do look good, but I can't get off
> the ground to see them :)
>
>
> cheers
> S.
>
>
>
>
>
> >
> > I'm very surprised that performance has decreased so significantly.
> > However, there is a possible explanation.
> >
> > The code falls back to a 2D cloud layer if a 3D cloud isn't defined for a
> > specific cloud type (st, ac etc.). IIRC
> > previously we didn't define a 3D stratus layer, so we'd get a 2D layer
> > instead.
> >
> > The updated 3D clouds include stratus layers (which look rather nice IMO),
> > but require quite a larger number
> > of sprites - something like 40 per cloud. I've seen a small perf hit from
> > the new stratus layers, but nothing like
> > what you have reported.
> >
> > I suspect what you are seeing if the difference between a 2D and 3D cloud.
> >
> > What performance change are you seeing with, say, cumulus clouds, which
> > haven't changed much?
> >
> > BTW - I've updated Docs/Readme.3Dclouds with information on the new format,
> > if anyone is interested in enhancing
> > the clouds.
> >
> > -Stuart
> >
> >
> >
> >
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