- ndc = get_tmp(c);
- emit_math1(c, BRW_MATH_FUNCTION_INV, ndc, brw_swizzle1(pos, 3), BRW_MATH_PRECISION_FULL);
- brw_MUL(p, brw_writemask(ndc, WRITEMASK_XYZ), pos, ndc);
+ if (!c->key.know_w_is_one) {
+ ndc = get_tmp(c);
+ emit_math1(c, BRW_MATH_FUNCTION_INV, ndc, brw_swizzle1(pos, 3), BRW_MATH_PRECISION_FULL);
+ brw_MUL(p, brw_writemask(ndc, WRITEMASK_XYZ), pos, ndc);
+ }
+ else {
+ ndc = pos;
+ }