diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_fs.cpp')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index b8dc2b6b278..0d1185b5e07 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -1304,6 +1304,11 @@ fs_visitor::emit_sampleid_setup(ir_variable *ir) * populating a temporary variable with the sequence (0, 1, 2, 3), * and then reading from it using vstride=1, width=4, hstride=0. * These computations hold good for 4x multisampling as well. + * + * For 2x MSAA and SIMD16, we want to use the sequence (0, 1, 0, 1): + * the first four slots are sample 0 of subspan 0; the next four + * are sample 1 of subspan 0; the third group is sample 0 of + * subspan 1, and finally sample 1 of subspan 1. */ fs_inst *inst; inst = emit(BRW_OPCODE_AND, t1, @@ -1313,7 +1318,7 @@ fs_visitor::emit_sampleid_setup(ir_variable *ir) inst = emit(BRW_OPCODE_SHR, t1, t1, fs_reg(5)); inst->force_writemask_all = true; /* This works for both SIMD8 and SIMD16 */ - inst = emit(MOV(t2, brw_imm_v(0x3210))); + inst = emit(MOV(t2, brw_imm_v(key->persample_2x ? 0x1010 : 0x3210))); inst->force_writemask_all = true; /* This special instruction takes care of setting vstride=1, * width=4, hstride=0 of t2 during an ADD instruction. |