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Lukas,
Questions and patches about 3D driver code should be posted to the
mesa3d-dev list. All of the 3D driver developers are there, and
messages are less likely to get lost in the noise.
Lukas Hejtmanek wrote:
> why this extension is not included in i915 driver? I added it to sources,
> recompiled and tested with www.glest.org, it seems to be ok, so I think it
> could
> be included into Mesa/src/mesa/drivers/dri/i915/i915_context.c:
The i915 driver uses (used to use?) code within the driver to convert
texture environments to fragment programs. At the time, this code did
not support GL_ARB_texture_env_crossbar. There is also generic code in
core Mesa for translating texture environments to fragment programs.
This code, which is used by the r300 driver, does support
GL_ARB_texture_env_crossbar. I proposed a similar patch sometime ago,
but the patch was rejected until the i915 driver was modified to use the
generic code in Mesa.
> --- i915_context.c.old 2006-04-21 17:01:24.000000000 +0200
> +++ i915_context.c 2006-04-21 16:56:47.000000000 +0200
> @@ -47,6 +47,7 @@
>
> static const struct dri_extension i915_extensions[] =
> {
> + { "GL_ARB_texture_env_crossbar", NULL },
> { "GL_ARB_depth_texture", NULL },
> { "GL_ARB_fragment_program", NULL },
> { "GL_ARB_shadow", NULL },
This is the only extension support by the i830 code that isn't (yet)
supported by the i915 code. I think it's better to just move this
extension string from i830_extensions to card_extensions. This is the
approach that I took in my earlier patch:
http://marc.theaimsgroup.com/?l=mesa3d-dev&m=111765472500944&w=2
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