Stumble damagetype

- DMG_STUMBLE in SOC, hardcode
- Has sector type
    - UDMF: damagetype = "Stumble"
    - Binary: Sector type 9, section 1
- Can be chained even when invincible, unlike Tumble
- Will never instinctively cause hitlag

src/deh_tables.c

@@ -6407,6 +6407,7 @@ struct int_const_s const INT_CONST[] = {
 	{"DMG_STING",DMG_STING},
 	{"DMG_KARMA",DMG_KARMA},
 	{"DMG_VOLTAGE",DMG_VOLTAGE},
+	{"DMG_STUMBLE",DMG_STUMBLE},
 	//// Death types
 	{"DMG_INSTAKILL",DMG_INSTAKILL},
 	{"DMG_DEATHPIT",DMG_DEATHPIT},

src/p_inter.c

@@ -2145,7 +2145,7 @@ boolean P_DamageMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, INT32 da
 
 				if (player->invincibilitytimer > 0)
 				{
-					sfx= sfx_invind;
+					sfx = sfx_invind;
 				}
 				else if (K_IsBigger(target, inflictor) == true)
 				{
@@ -2158,7 +2158,7 @@ boolean P_DamageMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, INT32 da
 					invincible = false;
 				}
 
-				if (invincible)
+				if (invincible && type != DMG_STUMBLE)
 				{
 					const INT32	oldhitlag = target->hitlag;
 
@@ -2179,18 +2179,24 @@ boolean P_DamageMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, INT32 da
 
 				{
 					// Check if we should allow wombo combos (hard hits by default, inverted by the presence of DMG_WOMBO).
-					boolean allowcombo = (hardhit == !(damagetype & DMG_WOMBO));
+					boolean allowcombo = ((hardhit || (type == DMG_STUMBLE)) == !(damagetype & DMG_WOMBO));
 
-					// Tumble is a special case.
+					// Tumble/stumble is a special case.
 					if (type == DMG_TUMBLE)
 					{
 						// don't allow constant combo
 						if (player->tumbleBounces == 1 && (P_MobjFlip(target)*target->momz > 0))
 							allowcombo = false;
 					}
+					else if (type == DMG_STUMBLE)
+					{
+						// don't allow constant combo
+						if (player->tumbleBounces == TUMBLEBOUNCES-1 && (P_MobjFlip(target)*target->momz > 0))
+							allowcombo = false;
+					}
 
 					// DMG_EXPLODE excluded from flashtic checks to prevent dodging eggbox/SPB with weak spinout
-					if ((target->hitlag == 0 || allowcombo == false) && player->flashing > 0 && type != DMG_EXPLODE)
+					if ((target->hitlag == 0 || allowcombo == false) && player->flashing > 0 && type != DMG_EXPLODE && type != DMG_STUMBLE)
 					{
 						// Post-hit invincibility
 						K_DoInstashield(player);
@@ -2200,7 +2206,7 @@ boolean P_DamageMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, INT32 da
 			}
 
 			// We successfully damaged them! Give 'em some bumpers!
-			if (type != DMG_STING)
+			if (type != DMG_STING && type != DMG_STUMBLE)
 			{
 				UINT8 takeBumpers = 1;
 
@@ -2306,6 +2312,10 @@ boolean P_DamageMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, INT32 da
 					K_KartPainEnergyFling(player);
 					ringburst = 0;
 					break;
+				case DMG_STUMBLE:
+					K_StumblePlayer(player);
+					ringburst = 0;
+					break;
 				case DMG_TUMBLE:
 					K_TumblePlayer(player, inflictor, source);
 					ringburst = 10;
@@ -2327,7 +2337,7 @@ boolean P_DamageMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, INT32 da
 					break;
 			}
 
-			if (type != DMG_STING)
+			if (type != DMG_STING && type != DMG_STUMBLE)
 			{
 				player->flashing = K_GetKartFlashing(player);
 			}
@@ -2350,8 +2360,11 @@ boolean P_DamageMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, INT32 da
 				K_DropHnextList(player, false);
 			}
 
-			player->instashield = 15;
-			K_SetHitLagForObjects(target, inflictor, laglength, true);
+			if (type != DMG_STUMBLE)
+			{
+				player->instashield = 15;
+				K_SetHitLagForObjects(target, inflictor, laglength, true);
+			}
 
 			if (inflictor && !P_MobjWasRemoved(inflictor) && inflictor->type == MT_BANANA)
 			{

src/p_local.h

@@ -528,6 +528,7 @@ struct BasicFF_t
 #define DMG_STING   0x04
 #define DMG_KARMA   0x05 // Karma Bomb explosion -- works like DMG_EXPLODE, but steals half of their bumpers & deletes the rest
 #define DMG_VOLTAGE 0x06
+#define DMG_STUMBLE 0x07
 //// Death types - cannot be combined with damage types
 #define DMG_INSTAKILL  0x80
 #define DMG_DEATHPIT   0x81

src/p_setup.c

@@ -1528,6 +1528,8 @@ static void ParseTextmapSectorParameter(UINT32 i, const char *param, const char
 			sectors[i].damagetype = SD_DEATHPIT;
 		if (fastcmp(val, "Instakill"))
 			sectors[i].damagetype = SD_INSTAKILL;
+		if (fastcmp(val, "Stumble"))
+			sectors[i].damagetype = SD_STUMBLE;
 	}
 	else if (fastcmp(param, "action"))
 		sectors[i].action = atol(val);
@@ -2441,6 +2443,9 @@ static void P_WriteTextmap(void)
 				case SD_INSTAKILL:
 					fprintf(f, "damagetype = \"Instakill\";\n");
 					break;
+				case SD_STUMBLE:
+					fprintf(f, "damagetype = \"Stumble\";\n");
+					break;
 				default:
 					break;
 			}
@@ -6011,6 +6016,9 @@ static void P_ConvertBinarySectorTypes(void)
 			case 8: //Instakill
 				sectors[i].damagetype = SD_INSTAKILL;
 				break;
+			case 9: // Stumble
+				sectors[i].damagetype = SD_STUMBLE;
+				break;
 			case 12: //Wall sector
 				sectors[i].specialflags |= SSF_NOSTEPUP;
 				break;

src/p_spec.c

@@ -5145,6 +5145,10 @@ static void P_EvaluateDamageType(player_t *player, sector_t *sector, boolean isT
 		case SD_INSTAKILL:
 			P_DamageMobj(player->mo, NULL, NULL, 1, DMG_INSTAKILL);
 			break;
+		case SD_STUMBLE:
+			if (isTouching)
+				P_DamageMobj(player->mo, NULL, NULL, 1, DMG_STUMBLE);
+			break;
 		default:
 			break;
 	}

src/r_defs.h

@@ -411,6 +411,7 @@ typedef enum
 	SD_LAVA = 2,
 	SD_DEATHPIT = 3,
 	SD_INSTAKILL = 4,
+	SD_STUMBLE = 5,
 } sectordamage_t;
 
 typedef enum