diff options
Diffstat (limited to 'src/mesa')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_sf_emit.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_sf_emit.c b/src/mesa/drivers/dri/i965/brw_sf_emit.c index 080a02b7304..ad1527e5193 100644 --- a/src/mesa/drivers/dri/i965/brw_sf_emit.c +++ b/src/mesa/drivers/dri/i965/brw_sf_emit.c @@ -59,6 +59,35 @@ static GLboolean have_attr(struct brw_sf_compile *c, return (c->key.attrs & (1<<attr)) ? 1 : 0; } +/** + * Sets VERT_RESULT_FOGC.Y for gl_FrontFacing + * + * This is currently executed if the fragment program uses VERT_RESULT_FOGC + * at all, but this could be eliminated with a scan of the FP contents. + */ +static void +do_front_facing( struct brw_sf_compile *c ) +{ + struct brw_compile *p = &c->func; + int i; + + if (!have_attr(c, VERT_RESULT_FOGC)) + return; + + brw_push_insn_state(p); + brw_CMP(p, brw_null_reg(), + c->key.frontface_ccw ? BRW_CONDITIONAL_G : BRW_CONDITIONAL_L, + c->det, brw_imm_f(0)); + brw_set_predicate_control(p, BRW_PREDICATE_NONE); + for (i = 0; i < 3; i++) { + struct brw_reg fogc = get_vert_attr(c, c->vert[i],FRAG_ATTRIB_FOGC); + brw_MOV(p, get_element(fogc, 1), brw_imm_f(0)); + brw_set_predicate_control(p, BRW_PREDICATE_NORMAL); + brw_MOV(p, get_element(fogc, 1), brw_imm_f(1)); + brw_set_predicate_control(p, BRW_PREDICATE_NONE); + } + brw_pop_insn_state(p); +} /*********************************************************************** @@ -355,6 +384,7 @@ void brw_emit_tri_setup( struct brw_sf_compile *c, GLboolean allocate) invert_det(c); copy_z_inv_w(c); + do_front_facing(c); if (c->key.do_twoside_color) do_twoside_color(c); |