[Mesa3d-dev] gallium + dri2 front buffer readback

[Dave A. <ai...@gm...>]

The piglit read-front.c test is failing and the rabbits warren that is
front buffer rendering in mesa st + dri st isn't helping me solve it.

One thing I noticed was check_create_front_buffers is called in a
number of places in the st, however it seems to never be used, as we
call st_manager_add_color_renderbuffer moments before and that sets up
the buffer.

so
 if (fb->Attachment[frontIndex].Renderbuffer == NULL) {

this always fails and we never do any of that stuff.

Maybe someone has a clue on how this is meant to work and I can implement that.

Dave.