Comment # 5
on bug 101596
from Matias N. Goldberg
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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