Subject:
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Re: video card
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Newsgroups:
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lugnet.cad.dev.mac
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Date:
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Tue, 26 Feb 2002 22:52:32 GMT
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Viewed:
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4139 times
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In lugnet.cad.dev.mac, Mark Abrams writes:
> "Don Heyse" <dheyse@hotmail.spam.go.away.com> writes:
>
> > In lugnet.cad.dev.mac, Mark Abrams writes:
> > > Here is the printout at startup.
> > >
> > > GL_VERSION = 1.1 APPLE-1.1 GL_EXTENSIONS = GL_APPLE_specular_vector
> > > GL_APPLE_transform_hint GL_APPLE_packed_pixel GL_APPLE_client_storage
> > > GL_ARB_transpose_matrix GL_EXT_clip_volume_hint GL_EXT_rescale_normal
> > > GL_NV_texgen_reflection GL_IBM_rasterpos_clip GL_ARB_texture_env_add
> > > GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract
> > > GL_EXT_texture_lod_bias GL_EXT_abgr GL_EXT_bgra GL_SGIS_texture_edge_clamp
> > > GL_ARB_multitexture GL_ARB_texture_env_combine GL_ARB_texture_env_dot3
> > > GL_VENDOR ='Apple' GL_RENDERER ='Generic' GL_RGBA_BITS: (5, 5, 5, 0)
> > > GL_DEPTH_BITS = 16 GL_STENCIL_BITS = 8 Buffer Swap Mode = 0
> > > Editing mode = 1{0}
> > >
> > > If this sounds buggy, then it may be a good place for me to start with the
> > > debugger. I borrowed a copy of 'OpenGL Progamming Guide' and a book on
> > > Graphics Programming algorithims.
> >
> > Before you debug, I'd try all 4 of (-le, -ledit, -LE, and -LEDIT)
>
> I have tried all 4. The differences are subtle, I'm not sure I see them all.
> I like -le the best because I can see the entire model on each refresh.
>
> > to see which methods have problems. Then comment out this line in
> > main.c and recompile:
> >
> > #define USE_OPENGL_STENCIL
>
> I commented this out but it did not make the trailing go away.
>
> I can always get the trails if the first thing I do when I open the app is to
> move a part. After that, the trails go away completely. It is actually worse
> when I can't see any trails, because I don't know where the piece has gone.
You could also try adding this:
if ((!strcmp(verstr, "1.1 APPLE-1.1")) &&
(!strcmp(vendstr, "Apple")) &&
(!strcmp(rendstr, "Generic"))
)
{
printf("Stencil buffer disabled for XOR with Apple driver.\n");
// Generic Apple driver has problem with XOR similar to NVIDIA.
use_stencil_for_XOR = 0;
}
Right before this line in main.c:
printf("Buffer Swap Mode = %d\n", buffer_swap_mode);
> > This might fix the wireframe droppings at the cost of some speed.
> >
> > The problems with editing mode all stem from the fact that opengl is
> > not setup to do this sort of thing without resorting to extensions.
> > It's very slow to make copies of the various buffers if you just want
> > to move one little piece around without redrawing everything. The
> > autocad folks added the KTX_buffer_region extension so you could
> > backup the buffers quickly in unused video memory, and nowadays the
> > pbuffers extension is starting to catch on for this as well. You
> > have neither available, so I resort to a trick using the stencil
> > buffer as something of a cache for the depth buffer. I've had
> > problems with this on the nvidia TNT, and now perhaps on your setup.
> > Compiling out the use of the stencil buffer might fix it.
> >
> > I wish I could find some info on that GL_APPLE_client_storage
> > extension. It has a promising sounding name.
>
>
> That does sound promising.
>
> Mark
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Message is in Reply To:
 | | Re: video card
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| (...) I have tried all 4. The differences are subtle, I'm not sure I see them all. I like -le the best because I can see the entire model on each refresh. (...) I commented this out but it did not make the trailing go away. I can always get the (...) (25 years ago, 25-Feb-02, to lugnet.cad.dev.mac)
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