Landing lag

References

1. ^ abIn the NTSC 1.02 version of Super Smash Bros. Melee, an aerial attack (statuses ftCo_MS_AttackAirN to ftCo_MS_AttackAirLw) that touches down calls ftCo_LandingAir_EnterWithLag from its collision routine ftCo_AttackAir_Coll, through ft_80082C74, which calls it when the unnamed ft_80081D0C returns true. If the move's command script has set cmd_vars[0], which entering the aerial clears, the fighter enters that aerial's LandingAir status with the fighter's landing-lag attribute for it (landingairn_lag and the four like it), and the animation plays at a rate of (ftAnim_8006F484 + 0.1) / lag, where ftAnim_8006F484 returns the animation's end frame. If the unnamed count x67F is below c_E4 at that moment, the lag is first divided by c_E8, truncated to a whole number, and raised to 1 if that's 0; c_E4 and c_E8 are p_ftCommonData fields from PlCo.dat, so the window and divisor aren't in the code. Fighter_procInput sets x67F to 0 on an update where the HSD_PAD_LR bit is newly pressed and otherwise adds 1, up to 255. That bit is on while L or R is held, while the analog trigger is past its deadzone, or while Z is held unless gm_GetDbPauseFlag(0) is true, and it's off while the unnamed gm_8016B0FC is true. Without cmd_vars[0], the fighter takes the basic landing (ftCo_Landing_Enter_Basic). Super Smash Bros. reads the same moment differently (ftCommonAttackAirProcMap): when the aerial's flag1 is clear or Z was pressed no more than 10 counts before (tics_since_last_z ≤ 10), it skips the aerial's landing lag outright, landing in Wait if the air speed is above −20 and in Landing otherwise, where Melee divides the lag.Codedoldecomp/melee · VetriTheRetri/ssb-decomp-re
   How we know

   14void ftCo_LandingAir_EnterWithLag(Fighter_GObj* gobj)
   ⋮
   20    if (fp->cmd_vars[0]) {
   21        switch (fp->motion_id) {
   22        case ftCo_MS_AttackAirN:
   23            lag = fp->co_attrs.landingairn_lag;
   24            msid = ftCo_MS_LandingAirN;
   25            break;
   ⋮
   29            break;
   ⋮
   33            break;
   ⋮
   37            break;
   ⋮
   41            break;
   ⋮
   43        if (msid != ftCo_MS_None && fp->x67F < p_ftCommonData->xE4) {
   ⋮
   

   59void ftCo_LandingAir_EnterWithMsidLag(Fighter_GObj* gobj, FtMotionId msid,
   60                                      float lag)
   ⋮
   64    Fighter_ChangeMotionState(gobj, msid, Ft_MF_None, 0, 1, 0, NULL);
   65    ftAnim_SetAnimRate(gobj, (ftAnim_8006F484(gobj) + 0.1f) / lag);
   

   575float ftAnim_8006F484(Fighter_GObj* fighter_gobj)
   ⋮
   580        return lbGetJObjEndFrame(jobj);
   ⋮
   582    return lbGetJObjEndFrame(fp->x8AC_animSkeleton);
   

   125void ftCo_AttackAir_EnterFromMsid(Fighter_GObj* gobj, FtMotionId msid)
   ⋮
   129    fp->cmd_vars[0] = 0;
   

   189void ftCo_AttackAir_Coll(Fighter_GObj* gobj)
   ⋮
   191    ft_80082C74(gobj, ftCo_LandingAir_EnterWithLag);
   

   850        // ftCo_MS_AttackAirN = 65
   ⋮
   857        ftCo_AttackAir_Coll,
   

   548void ft_80082C74(Fighter_GObj* gobj, HSD_GObjEvent cb)
   ⋮
   550    bool var_r0 = ft_80081D0C(gobj);
   551    PAD_STACK(8);
   552    if (var_r0) {
   553        cb(gobj);
   

   456void ftAction_80071820(Fighter_GObj* gobj, CommandInfo* cmd)
   ⋮
   460    switch (cmd->x8.u->set_cmd_var.idx) {
   461    case 0:
   462        fp->cmd_vars[0] = cmd->x8.u->set_cmd_var.value;
   

   947    /* +0E8 fp+1F8 */ float landingairn_lag;
   948    /* +0EC fp+1FC */ float landingairf_lag;
   949    /* +0F0 fp+200 */ float landingairb_lag;
   950    /* +0F4 fp+204 */ float landingairhi_lag;
   951    /* +0F8 fp+208 */ float landingairlw_lag;
   

   1879            if (gm_8016B0FC()) {
   1880                fp->input.triggers[0] = 0.0f;
   1881                if (ftCo_IsCpuControlled(fp)) {
   1882                    fp->input.held_buttons[0] &= HSD_PAD_A | HSD_PAD_XY;
   1883                } else {
   1884                    fp->input.held_buttons[0] &= HSD_PAD_A;
   ⋮
   1886            } else {
   1887                if (fp->input.held_buttons[0] & (HSD_PAD_L | HSD_PAD_R)) {
   1888                    fp->input.held_buttons[0] |= HSD_PAD_LR;
   1889                    fp->input.triggers[0] = 1.0f;
   1890                } else if (fp->input.triggers[0]) {
   1891                    fp->input.held_buttons[0] |= HSD_PAD_LR;
   ⋮
   

   1866            if (fp->input.triggers[0] <=
   1867                p_ftCommonData->analog_shoulder_deadzone)
   ⋮
   1869                fp->input.triggers[0] = 0.0f;
   

   1759static void Fighter_procInput_Inner1(Fighter* fp)
   ⋮
   1764    temp0_loc_0 = (fp->input.held_buttons[0] &
   1765                   (fp->input.held_buttons[1] ^ fp->input.held_buttons[0]));
   

   1902            Fighter_procInput_Inner1(fp);
   

   2105            if (fp->input.pressed_buttons & HSD_PAD_LR) {
   2106                fp->x67F = 0;
   2107            } else if (fp->x67F < 255) {
   2108                fp->x67F++;
   

   53void ftCommonAttackAirProcMap(GObj *fighter_gobj)
   ⋮
   57    if (mpCommonCheckFighterLanding(fighter_gobj) != FALSE)
   ⋮
   59        if ((fp->motion_vars.flags.flag1 != 0) && (fp->tics_since_last_z > FTCOMMON_ATTACKAIR_SMOOTHLANDING_TICS_MAX))
   ⋮
   65                ftCommonLandingAirSetStatus(fighter_gobj);
   ⋮
   67            else ftCommonLandingAirNullSetStatus(fighter_gobj, F_PCT_TO_DEC(fp->motion_vars.flags.flag1));
   ⋮
   69        else if (fp->physics.vel_air.y > FTCOMMON_ATTACKAIR_SKIPLANDING_VEL_Y_MAX)
   ⋮
   71            ftCommonWaitSetStatus(fighter_gobj);
   ⋮
   73        else ftCommonLandingSetStatus(fighter_gobj);
   

   361#define FTCOMMON_ATTACKAIR_SMOOTHLANDING_TICS_MAX 10
   362#define FTCOMMON_ATTACKAIR_SKIPLANDING_VEL_Y_MAX (-20.0F)
   

   1373    if (this_fp->tics_since_last_z < FTINPUT_ZTRIGLAST_TICS_MAX)
   ⋮
   1375        this_fp->tics_since_last_z++;
   ⋮
   1377    if (this_fp->input.pl.button_tap & this_fp->input.button_mask_z)
   ⋮
   1379        this_fp->tics_since_last_z = 0;
   

   190                fp->motion_vars.flags.flag1 = 0;
   

   Checked against the evidence by its author, an AI model, 2026-10-22.

   Checked by a second AI model, 2026-10-22.

   In the claim ledger

2. ^ abIn the US version of Super Smash Bros., when a fighter in an air attack lands, ftCommonAttackAirProcMap enters the move's air-landing status only when the motion's flag1 is nonzero and more than 10 counts have passed since Z was last pressed (tics_since_last_z: set to 0 on a Z press, counted up each update, and set to its maximum when the air attack starts, so a press before the attack doesn't count); otherwise it skips that status and enters Wait if the fighter's vertical speed is above −20, or the plain Landing status if not. Reading flag1 as the move's switch for landing lag is the atlas's.CodeVetriTheRetri/ssb-decomp-rerevised
   How we know

   53void ftCommonAttackAirProcMap(GObj *fighter_gobj)
   ⋮
   59        if ((fp->motion_vars.flags.flag1 != 0) && (fp->tics_since_last_z > FTCOMMON_ATTACKAIR_SMOOTHLANDING_TICS_MAX))
   ⋮
   65                ftCommonLandingAirSetStatus(fighter_gobj);
   ⋮
   69        else if (fp->physics.vel_air.y > FTCOMMON_ATTACKAIR_SKIPLANDING_VEL_Y_MAX)
   ⋮
   71            ftCommonWaitSetStatus(fighter_gobj);
   ⋮
   73        else ftCommonLandingSetStatus(fighter_gobj);
   

   361#define FTCOMMON_ATTACKAIR_SMOOTHLANDING_TICS_MAX 10
   362#define FTCOMMON_ATTACKAIR_SKIPLANDING_VEL_Y_MAX (-20.0F)
   

   1373    if (this_fp->tics_since_last_z < FTINPUT_ZTRIGLAST_TICS_MAX)
   ⋮
   1375        this_fp->tics_since_last_z++;
   ⋮
   1377    if (this_fp->input.pl.button_tap & this_fp->input.button_mask_z)
   ⋮
   1379        this_fp->tics_since_last_z = 0;
   

   202                fp->tics_since_last_z = FTINPUT_ZTRIGLAST_TICS_MAX;
   

   Checked against the evidence by its author, an AI model, 2026-10-27.

   Revised after a check by a second AI model, 2026-10-27: Starting an air attack sets the Z counter to its maximum, so a press before the attack doesn't count.

   In the claim ledger