3 vertex color interpolation

[John Hunter-4]

Is there any way in agg given a triangle with an rgba at each vertex,
to render the triangle with the colors smoothly interpolated, as in
the open gl rendered triangle on the right

http://cboard.cprogramming.com/attachments/game-programming/7795d1202549906-color-interpolation-interpolate-png

JDH

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[Stephan Assmus]

John Hunter schrieb:
> Is there any way in agg given a triangle with an rgba at each vertex,
> to render the triangle with the colors smoothly interpolated, as in
> the open gl rendered triangle on the right
>
> http://cboard.cprogramming.com/attachments/game-programming/7795d1202549906-color-interpolation-interpolate-png

IIRC, it is demonstrated in the gouraud demo.

Best regards,
-Stephan


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[John Hunter-4]

On Fri, Aug 7, 2009 at 7:18 AM, Stephan Aßmus<superstippi@...> wrote:
> IIRC, it is demonstrated in the gouraud demo.
>

Thanks Stephan,

This looks good.  I was able to compile and run the example on linux,
but on my OSX box w/ gcc 4.0.1, I get a internal compiler error

home:~/tmp/agg-2.5/examples/X11> make gouraud
< ../gouraud.cpp >
g++ -c -O3 -I/usr/X11R6/include -L/usr/X11R6/lib -I../../include
-L../../src  ../gouraud.cpp -o ../gouraud.o
../../include/agg_renderer_scanline.h: In function ‘void
agg::render_scanlines_aa_solid(Rasterizer&, Scanline&, BaseRenderer&,
const ColorT&) [with Rasterizer =
agg::rasterizer_scanline_aa<agg::rasterizer_sl_clip<agg::ras_conv_int>
>, Scanline = agg::scanline_u8, BaseRenderer =
agg::renderer_base<pixfmt>, ColorT = agg::rgba]’:
../../include/agg_renderer_scanline.h:108: error: insn does not
satisfy its constraints:
(insn 1069 162 164 4 (set (mem:QI (plus:SI (reg/f:SI 6 bp)
                (const_int -104 [0xffffffffffffff98])) [0 ren_color$a+0 S1 A8])
        (reg:QI 4 si)) 56 {*movqi_1} (nil)
    (nil))
../../include/agg_renderer_scanline.h:108: internal compiler error: in
reload_cse_simplify_operands, at postreload.c:391
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://developer.apple.com/bugreporter> for instructions.
make: *** [../gouraud.o] Error 1
home:~/tmp/agg-2.5/examples/X11> ./gouraud
-bash: ./gouraud: No such file or directory
home:~/tmp/agg-2.5/examples/X11> gcc --version
i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5484)
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

home:~/tmp/agg-2.5/examples/X11>

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[Stephan Assmus]

Hi,

On 2009-08-07 at 14:53:29 [+0200], John Hunter <jdh2358@...> wrote:

> On Fri, Aug 7, 2009 at 7:18 AM, Stephan Aßmus<superstippi@...> wrote:
> > IIRC, it is demonstrated in the gouraud demo.
> >
> This looks good.  I was able to compile and run the example on linux, but
> on my OSX box w/ gcc 4.0.1, I get a internal compiler error
>
> home:~/tmp/agg-2.5/examples/X11> make gouraud
> < ../gouraud.cpp >
> g++ -c -O3 -I/usr/X11R6/include -L/usr/X11R6/lib -I../../include
> -L../../src  ../gouraud.cpp -o ../gouraud.o
> ../../include/agg_renderer_scanline.h: In function ‘void
> agg::render_scanlines_aa_solid(Rasterizer&, Scanline&, BaseRenderer&,
> const ColorT&) [with Rasterizer =
> agg::rasterizer_scanline_aa<agg::rasterizer_sl_clip<agg::ras_conv_int>
> >, Scanline = agg::scanline_u8, BaseRenderer =
> agg::renderer_base<pixfmt>, ColorT = agg::rgba]’:
> ../../include/agg_renderer_scanline.h:108: error: insn does not satisfy
> its constraints:
> (insn 1069 162 164 4 (set (mem:QI (plus:SI (reg/f:SI 6 bp)
>                 (const_int -104 [0xffffffffffffff98])) [0 ren_color$a+0
>                 S1 A8])
>         (reg:QI 4 si)) 56 {*movqi_1} (nil)
>     (nil))
> ../../include/agg_renderer_scanline.h:108: internal compiler error: in
> reload_cse_simplify_operands, at postreload.c:391
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://developer.apple.com/bugreporter> for instructions. make:
> *** [../gouraud.o] Error 1
> home:~/tmp/agg-2.5/examples/X11> ./gouraud
> -bash: ./gouraud: No such file or directory
> home:~/tmp/agg-2.5/examples/X11> gcc --version
> i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5484)
> Copyright (C) 2005 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is
> NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
> PURPOSE.

Well, I don't know what to suggest, other than to try and follow the advice
above (Please submit a full bug report, with preprocessed source if
appropriate. See <URL:http://developer.apple.com/bugreporter> for
instructions.).

4.0.1 would be a very early GCC 4 release, so most likely it's indeed the
fault of the compiler. One could argue that if there were something wrong
with the code, the compiler should respond with something else than an
internal compiler error. Can you try a newer GCC on your MacOS X
installation?

Best regards,
-Stephan

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