[Mesa-dev] updating tex combine for frag program

Dave Airlie airlied at gmail.com
Tue Feb 7 23:23:02 PST 2012

On Tue, Feb 7, 2012 at 10:09 PM, Ian Romanick <idr at freedesktop.org> wrote:
> On 02/07/2012 12:08 PM, Dave Airlie wrote:
>> Hi guys,
>> Is there any reason we need to update tex combiner state if we are
>> using shaders?
>> can we drop update_tex_combine updates to only the case where we don't
>> have a fragment shader/program unless its from the FF shader?
> I don't recall when update_tex_combine happens.  Does it happen at draw-time
> or state change-time?  If it happens at state change-time, the state will
> need to get updated when program 0 gets bound.  Otherwise something like the
> following would break:
>        glUseProgram(my_prog);
>                GL_DECAL);
>        glUseProgram(0);
>        glDrawArrays(...);

IT happens in update_texture_state which happens on _NEW_TEXTURE, so
it should be fine, since with the maintain fixed function stuff we
update the program on _NEW_TEXTURE.


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