From 6611c57cbfe499763fbfd8c6fad910bf21570c2d Mon Sep 17 00:00:00 2001
From: Marco Cawthorne <marco@vera-visions.com>
Date: Sat, 15 Jul 2023 19:38:42 -0700
Subject: [PATCH] trigger_push: add support for the target field, for Q3A
 styled jump pads

---
 triggers.qc | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/triggers.qc b/triggers.qc
index 0d31915..02c6bed 100644
--- a/triggers.qc
+++ b/triggers.qc
@@ -601,8 +601,57 @@ void() trigger_hurt =
 
 float PUSH_ONCE = 1;
 
+float(float value) sqrt = #62;
+
+vector
+trigger_push_velfortarget(vector vecFrom, vector vecTo, float flGravMod)
+{
+	float flHeight, flGravity, flTime, flDistance, flDir;
+	vector vecJump = [0,0,0];
+
+	if (flGravMod <= 0.0)
+		flGravMod = 1.0f;
+
+	flGravity = cvar("sv_gravity") * flGravMod;
+	flHeight = vecTo[2] - vecFrom[2];
+
+	/* this may not be a much verticality to this jump, use distance instead */
+	if (flHeight <= 0) {
+		flHeight = vlen(vecTo - vecFrom);
+		flTime = flHeight / flGravity;
+	} else {
+		flTime = sqrt(flHeight / (flGravity * 0.5f));
+		if (flTime <= 0) {
+			return [0,0,0];
+		}
+	}
+
+	vecJump = vecTo - vecFrom;
+	vecJump[2] = 0;
+	flDistance = vlen(normalize(vecJump));
+
+	flDir = flDistance / flTime;
+	vecJump *= flDir;
+	vecJump[2] = flTime * flGravity;
+
+	return vecJump;
+}
+
 void() trigger_push_touch =
 {
+	/* if our trigger_push has a target, bah */
+	if (self.target) {
+		entity targetPos = find(world, ::targetname, self.target);
+		vector pushCenter = ( self.absmin + ( 0.5 * ( self.absmax - self.absmin ) ) );
+
+		if (targetPos) {
+			self.movedir = targetPos.origin;
+		}
+
+		other.velocity = trigger_push_velfortarget(pushCenter, self.movedir, 1.0);
+		return;
+	}
+
 	if (other.classname == "grenade")
 		other.velocity = self.speed * self.movedir * 10;
 	else if (other.health > 0)