diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_fs.h')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h index de7b15312a..00a000855c 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.h +++ b/src/mesa/drivers/dri/i965/brw_fs.h @@ -348,6 +348,23 @@ public: hash_table_pointer_hash, hash_table_pointer_compare); + /* There's a question that appears to be left open in the spec: + * How do implicit dst conversions interact with the CMP + * instruction or conditional mods? On gen6, the instruction: + * + * CMP null<d> src0<f> src1<f> + * + * will do src1 - src0 and compare that result as if it was an + * integer. On gen4, it will do src1 - src0 as float, convert + * the result to int, and compare as int. In between, it + * appears that it does src1 - src0 and does the compare in the + * execution type so dst type doesn't matter. + */ + if (this->intel->gen > 4) + this->reg_null_cmp = reg_null_d; + else + this->reg_null_cmp = reg_null_f; + this->frag_color = NULL; this->frag_data = NULL; this->frag_depth = NULL; @@ -485,6 +502,7 @@ public: fs_reg pixel_w; fs_reg delta_x; fs_reg delta_y; + fs_reg reg_null_cmp; int grf_used; }; |