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i965/fs: Predicate PLN instructions used in unlit centroid WA. 

Maybe lets us skip some PLN instructions if whole subspans are disabled?

Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
This commit is contained in:
Matt Turner 2014-06-28 18:38:03 -07:00
parent 6d2536395d
commit 4fe53ee5d7
1 changed files with 14 additions and 6 deletions
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20
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -1168,9 +1168,6 @@ fs_visitor::emit_general_interpolation(ir_variable *ir)
/* Smooth/noperspective interpolation case. */
for (unsigned int k = 0; k < type->vector_elements; k++) {
struct brw_reg interp = interp_reg(location, k);
emit_linterp(attr, fs_reg(interp), interpolation_mode,
ir->data.centroid && !key->persample_shading,
ir->data.sample || key->persample_shading);
if (brw->needs_unlit_centroid_workaround && ir->data.centroid) {
/* Get the pixel/sample mask into f0 so that we know
* which pixels are lit. Then, for each channel that is
@ -1178,11 +1175,22 @@ fs_visitor::emit_general_interpolation(ir_variable *ir)
* data.
*/
emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS);
fs_inst *inst = emit_linterp(attr, fs_reg(interp),
interpolation_mode,
false, false);
fs_inst *inst;
inst = emit_linterp(attr, fs_reg(interp), interpolation_mode,
ir->data.centroid && !key->persample_shading,
ir->data.sample || key->persample_shading);
inst->predicate = BRW_PREDICATE_NORMAL;
inst->predicate_inverse = false;
inst = emit_linterp(attr, fs_reg(interp), interpolation_mode,
false, false);
inst->predicate = BRW_PREDICATE_NORMAL;
inst->predicate_inverse = true;
} else {
emit_linterp(attr, fs_reg(interp), interpolation_mode,
ir->data.centroid && !key->persample_shading,
ir->data.sample || key->persample_shading);
}
if (brw->gen < 6 && interpolation_mode == INTERP_QUALIFIER_SMOOTH) {
emit(BRW_OPCODE_MUL, attr, attr, this->pixel_w);