diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_fs_visitor.cpp')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp index f1c6860fe47..98cd064aceb 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp @@ -1435,7 +1435,17 @@ fs_visitor::visit(ir_discard *ir) { assert(ir->condition == NULL); /* FINISHME */ - emit(FS_OPCODE_DISCARD); + /* We track our discarded pixels in f0.1. By predicating on it, we can + * update just the flag bits that aren't yet discarded. By emitting a + * CMP of g0 != g0, all our currently executing channels will get turned + * off. + */ + fs_reg some_reg = fs_reg(retype(brw_vec8_grf(0, 0), + BRW_REGISTER_TYPE_UW)); + fs_inst *cmp = emit(CMP(reg_null_f, some_reg, some_reg, + BRW_CONDITIONAL_NZ)); + cmp->predicate = BRW_PREDICATE_NORMAL; + cmp->flag_subreg = 1; } void |