Armin Widmer wrote:
>
> Hello, and Happy New Year:
>
> A few days ago I downloaded MesaLib-3.1.tar.gz and MesaDemos-3.1.tar.gz.
> After the installation of the new libraries, I noticed the following
> problems in one of my applications:
>
> - Text rendered with glBitmap is not depthcued
> - Lines rendered intermixed with text appear with wrong colour
> - Lines rendered intermixed with text are not properly antialiased
>
> This happens only for simple (just lines and text) scenes. The program
> runs fine under OpenGL on various SGI's, under OpenGL on Pentium II
> under Windows 98 and NT, and on Pentium II under Mesa 3.0 and Mesa
> 3.1beta, Linux (RedHat 6.0, Kernel 2.2.15).
>
> After a bit of debugging, I found out that the problem seems to be in
> render_bitmap (bitmap.c): this function is called to render the text
> bitmaps, with ctx->NewState==0, ctx->PB->primitive!=GL_BITMAP, hence nof
> Fog (depthcue) in gl_flush_pb. This looked suspect to me, and I added
> the following lines to bitmap.c,
> line 77:
>
> AW on pluto 96> diff bitmap.c.original bitmap.c
> 77a78,81
> > if (ctx->PB->primitive!=GL_BITMAP) { /* A.W. 1.1.2000 */
> > gl_reduced_prim_change( ctx, GL_BITMAP );
> > }
> >
>
> As far as I can see, this fixes the depthcue/antialias problems for
> lines and text. Could you please let me know, if my analysis is correct.
> If it isn't, I will try to provide you with a small demo-program which
> illustrates the problem.
I wrote my own test. Your patch appears to solve the problem. I've
checked it in.
Keith, perhaps you could double-check it though to make sure this isn't
a symptom of a bigger problem.
> Mesa is great! I started using it ~1 year ago, and was able to port a
> medium-complex application (molecular graphics, ~10,000 lines of code)
> from OpenGL/SGI without changing a single line of code. And less bugs
> than in the 'original' too. Keep up the good work.
Thanks. Glad you like it.
-Brian
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