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Adding TTL to CWeapon #1893

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Adding TTL to CWeapon #1893

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seedship
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@seedship seedship commented Jan 12, 2025 •
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Added option to set ttl in SetUnitWeaponState, and added a ttl field into CWeapon. This overrides the original weaponDef->flighttime so games can set weapon ttl per weapon.

Addresses #1683

Tested with the following gadget in Zero-K:

if gadgetHandler:IsSyncedCode() then
    function gadget:AllowCommand(unitID, unitDefID, teamID)
        local ttl = 1
        print("Calling Spring Set Unit Weapon State")
        Spring.SetUnitWeaponState(unitID, 1, "ttl", ttl)
        return true
    end
end

Verified:

  • Nimbus Emg shells explode immediately
  • Emissary cannon shell explodes immediately
  • Likho bomb explodes immediately
  • Ronin rocket looks like it explodes immediately
  • Rogue rocket has no fuel and does an arc and cannot hit the rogue's max range
  • Starburst weapons (racketeer and impaler) seem to be unaffected.
  • Urchin torpedos just fall straight down and explode and cannot hit their target.

saurtron
saurtron reviewed Jan 12, 2025
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rts/Sim/Weapons/Cannon.cpp Outdated Show resolved Hide resolved
rts/Sim/Weapons/Weapon.h Outdated
@@ -151,6 +151,7 @@ class CWeapon : public CObject
int nextSalvo; // when the next shot in the current salvo will fire
int salvoLeft; // number of shots left in current salvo
int salvoWindup; // delay before first shot (in frames)
int ttl; // flight time for missile type weapons
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@saurtron saurtron Jan 12, 2025 •
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maybe comment should be "projectile flighttime" since it's not just for missile type weapons, also maybe should mention it refers to frames.

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Renamed the comment to say projectile type weapons. It does set the ttl field in the projectile params.

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It seems Starburst weapons/projectiles are complicated and do their own thing. I will leave them alone in this PR.

saurtron
saurtron reviewed Jan 12, 2025
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rts/Sim/Weapons/StarburstLauncher.cpp
@@ -39,9 +39,10 @@ void CStarburstLauncher::FireImpl(const bool scriptCall)
params.end = currentTargetPos;
params.speed = speed;
params.error = aimError;
params.ttl = 200; //???
// Projectile TTL (params.ttl) is ignored by the Starburst Projectile and it only uses the weapondef.
// I tried overriding the projectile TTL to 1 and it caused the starburst rocket to fly off into space
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@saurtron saurtron Jan 12, 2025 •
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Looks like it goes up until uptime runs out, and only then is ttl evaluated, so you need to set a ttl a bit higher than uptime in that case to see an effect. Could make the logic of how ttl and uptime interact a bit more intuitive maybe, but not in scope of this pr.

rts/Sim/Weapons/StarburstLauncher.cpp
@@ -39,9 +39,10 @@ void CStarburstLauncher::FireImpl(const bool scriptCall)
params.end = currentTargetPos;
params.speed = speed;
params.error = aimError;
params.ttl = 200; //???
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I think you can make this pass ttl on and then make StarburstProjectile.cpp not overwrite it from weaponDef. That way ttl should also be controllable for starburst.

rts/Sim/Weapons/Cannon.cpp
@@ -110,27 +110,27 @@ void CCannon::FireImpl(const bool scriptCall)
launchDir += (gsRNG.NextVector() * SprayAngleExperience() + SalvoErrorExperience());
launchDir.SafeNormalize();

int ttl = 0;
int thisTtl = 0;
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@saurtron saurtron Jan 12, 2025 •
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Don't like Ttl form personally, but not the only place that writes it (Ttl) like that (vs TTL). Also maybe consider myTTL or myTtl instead of thisTtl/thisTTL, I think it's more in line with style around these files.

Anyways not really an issue since it's more of a personal preference thing, you can choose any you want from thisTtl/thisTTL/myTtl/myTTL

sprunk
sprunk reviewed Jan 12, 2025
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rts/Lua/LuaSyncedCtrl.cpp
@@ -2206,6 +2206,10 @@ static bool SetSingleUnitWeaponState(lua_State* L, CWeapon* weapon, int index)
weapon->collisionFlags = lua_toint(L, index + 1);
} break;

case hashString("ttl"): {
weapon->ttl = lua_toint(L, index + 1);
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@sprunk sprunk Jan 12, 2025 •
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Use seconds (see e.g. line 2176)

Suggested change
weapon->ttl = lua_toint(L, index + 1);
weapon->ttl = (int) (lua_tofloat(L, index + 1) * GAME_SPEED);

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@saurtron saurtron Jan 12, 2025 •
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This can make it a bit awkward if a specific number of frames is desired.

If changing it to seconds, then SetSingleUnitWeaponState key should maybe be called flightTime since ttl is in frames for projectiles Get/SetProjectileTimeToLive.

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You can control frames perfectly by multiplying by frames per second. Calling it flightTime sounds fine.

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@saurtron saurtron Jan 12, 2025 •
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Actually... weapondef flightTime is also in frames, probably better to have all in frames for consistency.

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@sprunk sprunk Jan 12, 2025 •
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No it's not.

spring/rts/Sim/Weapons/WeaponDef.cpp

Line 123 in d9dcff2

WEAPONDUMMYTAG(float, flighttime).defaultValue(0).scaleValue(GAME_SPEED).description("Lifetime of the projectile, in seconds. Missile/Torpedo/Starburst projectiles 'lose fuel' and fall down; Cannons explode; others fade away"); // needs to be written as int and read as float

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@saurtron saurtron Jan 12, 2025 •
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Right, perfect then, lets call it flightTime and make it in seconds too.

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Going on vacation for a week, will address the comments when I get back.

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@seedship @sprunk @saurtron