[Bug 101596] Blender renders black UI elements

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=101596

--- Comment #5 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
Mystery solved:

When I click the material button, this function is hit:

1  st_get_fp_variant    st_program.c       1326 0x7fbb34c5c595 
2  get_color_fp_variant st_cb_drawpixels.c 963  0x7fbb34c0ae87 
3  st_DrawPixels        st_cb_drawpixels.c 1115 0x7fbb34c0b3ea 
4  _mesa_DrawPixels     drawpix.c          163  0x7fbb3499d954 
5  ??                                           0x55b9c4a159d5 
6  ??                                           0x55b9c4a15d20 
7  ??                                           0x55b9c4a3e15c 
8  ??                                           0x55b9c4a3f956 
9  ui_draw_but                                  0x55b9c4a428cb 
10 UI_block_draw                                0x55b9c49f700a 
11 UI_panels_draw                               0x55b9c4a23ede 
12 ED_region_panels                             0x55b9c4b11bbd 
13 ??                                           0x55b9c484050e 
14 ED_region_do_draw                            0x55b9c4b10837 
15 wm_draw_update                               0x55b9c4817a96 
16 WM_main                                      0x55b9c4813008 
17 main                                         0x55b9c47d015e 

get_color_fp_variant ends up calling st_get_fp_variant even though
st->has_shareable_shaders is set; and st_get_fp_variant ends up creating a new
variant.

st_get_fp_variant will create a new variant and add it to the front of the
linked list:
fpv->next = stfp->variants;
stfp->variants = fpv;

Therefore later on st_update_fp thinks only one variant should be there, and
tries to use the first one, which is the new one created by _mesa_DrawPixels;
which is wrong, triggering all the glitches.

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