[Mystik Spiral]

Using SDKHook_OnTakeDamage, I have already determined that the inflictor is "grenade_launcher_projectile". What I want to do next is determine if the grenade_launcher_projectile is using special ammo, like incendiary or explosive. With regular weapons I can do this using...

GetEntProp(weapon, Prop_Send, "m_upgradeBitVec")

Of course, with the grenade launcher, the weapon is -1, so the above command will not work. If I try the same command above but use inflictor (the projectile) instead of weapon...

GetEntProp(inflictor, Prop_Send, "m_upgradeBitVec")

...it fails with...

Property "m_upgradeBitVec" not found (entity 148/grenade_launcher_projectile)

How do I determine whether the damage from grenade_launcher_projectile includes incendiary/explosive special ammo?

[Marttt]

Maybe you can check the damage type, I'm not certain but the incendiary may have the flags of "DMG_BURN" and the explosive "DMG_BLAST".

But may have another way to find this.

[BRU7US]

Try to use m_nUpgradedPrimaryAmmoLoaded. This must return amount of upgraded ammo, but not type of ammo.

[Mystik Spiral]

Originally Posted by Marttt Maybe you can check the damage type, I'm not certain but the incendiary may have the flags of "DMG_BURN" and the explosive "DMG_BLAST". But may have another way to find this.

Thank you Marttt! This mostly worked. That is, after I know the inflictor is "grenade_launcher_projectile" and I do a check like this for incendiary...

if (damagetype & DMG_BURN)

...it correctly evaluates true with incendiary ammo. However, if I check like this for explosive...

if (damagetype & DMG_BLAST)

...it evaluates true for both explosive explosive ammo and regular explosive ammo.

It does seem rather redundant that a grenade launcher could use regular explosive ammo or explosive explosive ammo, but there must be some reason why explosive explosive ammo can be loaded. My tests seem to indicate explosive explosive ammo does not cause any more damage than regular explosive ammo. Maybe it just expands the kill/stumble zone?

[Marttt]

Hm try to output to the chat the damagetype as int without explosive ammo, and with explosive ammo, check if any flag is added. Maybe not, since grenade launcher already "explodes" as default. I use the damage type do detect if the damage is from spit, but may not work properly for explosive ammo in grenade launcher.

I usually use some other plugins to help me to detect what is changing,
Check this plugin:

https://forums.alliedmods.net/showthread.php?p=1349107

I usually output the entity (activeWeapon) to the chat, and by using this I type !ted_selectid (entity id) then !ted_watch

And you can detect what is being changed