Add ImpactOrientation to WarheadArgs

Allows to pass the horizontal facing/yaw
and vertical angle/pitch of the carrier
projectile to warheads for further use.

Add ImpactPosition to WarheadArgs

InflictDamage doesn't pass the impact pos
directly, and the very point of WarheadArgs
is to avoid adding more and more arguments
to the warhead methods.

OpenRA.Mods.Common/Projectiles/GravityBomb.cs

@@ -12,6 +12,7 @@
 using System.Collections.Generic;
 using OpenRA.GameRules;
 using OpenRA.Graphics;
+using OpenRA.Primitives;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common.Projectiles
@@ -58,7 +59,7 @@ namespace OpenRA.Mods.Common.Projectiles
 		WVec velocity;
 
 		[Sync]
-		WPos pos;
+		WPos pos, lastPos;
 
 		public GravityBomb(GravityBombInfo info, ProjectileArgs args)
 		{
@@ -82,6 +83,7 @@ namespace OpenRA.Mods.Common.Projectiles
 
 		public void Tick(World world)
 		{
+			lastPos = pos;
 			pos += velocity;
 			velocity += acceleration;
 
@@ -90,7 +92,13 @@ namespace OpenRA.Mods.Common.Projectiles
 				pos += new WVec(0, 0, args.PassiveTarget.Z - pos.Z);
 				world.AddFrameEndTask(w => w.Remove(this));
 
-				args.Weapon.Impact(Target.FromPos(pos), new WarheadArgs(args));
+				var warheadArgs = new WarheadArgs(args)
+				{
+					ImpactOrientation = new WRot(WAngle.Zero, Util.GetVerticalAngle(lastPos, pos), args.Facing),
+					ImpactPosition = pos,
+				};
+
+				args.Weapon.Impact(Target.FromPos(pos), warheadArgs);
 			}
 
 			if (anim != null)