Implement adding velocity to player from Lua

The intended usecase is knockback, but there's potential for more.

3 files changed, 17 insertions, 0 deletions

diff --git a/src/client/client.h b/src/client/client.h
index 15a4689c1..3bfb1631e 100644
--- a/src/client/client.h
+++ b/src/client/client.h
@@ -227,6 +227,7 @@ public:
 	void handleCommand_SrpBytesSandB(NetworkPacket *pkt);
 	void handleCommand_FormspecPrepend(NetworkPacket *pkt);
 	void handleCommand_CSMRestrictionFlags(NetworkPacket *pkt);
+	void handleCommand_PlayerSpeed(NetworkPacket *pkt);
 
 	void ProcessData(NetworkPacket *pkt);
 
diff --git a/src/client/localplayer.cpp b/src/client/localplayer.cpp
index 0e273a16a..c356f7c24 100644
--- a/src/client/localplayer.cpp
+++ b/src/client/localplayer.cpp
@@ -188,6 +188,7 @@ void LocalPlayer::move(f32 dtime, Environment *env, f32 pos_max_d,
 	// Copy parent position if local player is attached
 	if (isAttached) {
 		setPosition(overridePosition);
+		added_velocity = v3f(); // ignored
 		return;
 	}
 
@@ -201,9 +202,13 @@ void LocalPlayer::move(f32 dtime, Environment *env, f32 pos_max_d,
 	if (noclip && free_move) {
 		position += m_speed * dtime;
 		setPosition(position);
+		added_velocity = v3f(); // ignored
 		return;
 	}
 
+	m_speed += added_velocity;
+	added_velocity = v3f();
+
 	/*
 		Collision detection
 	*/
@@ -782,6 +787,7 @@ void LocalPlayer::old_move(f32 dtime, Environment *env, f32 pos_max_d,
 	if (isAttached) {
 		setPosition(overridePosition);
 		m_sneak_node_exists = false;
+		added_velocity = v3f();
 		return;
 	}
 
@@ -795,9 +801,13 @@ void LocalPlayer::old_move(f32 dtime, Environment *env, f32 pos_max_d,
 		position += m_speed * dtime;
 		setPosition(position);
 		m_sneak_node_exists = false;
+		added_velocity = v3f();
 		return;
 	}
 
+	m_speed += added_velocity;
+	added_velocity = v3f();
+
 	/*
 		Collision detection
 	*/
diff --git a/src/client/localplayer.h b/src/client/localplayer.h
index 84cfa583a..16e7996ae 100644
--- a/src/client/localplayer.h
+++ b/src/client/localplayer.h
@@ -149,6 +149,11 @@ public:
 
 	bool getAutojump() const { return m_autojump; }
 
+	inline void addVelocity(const v3f &vel)
+	{
+		added_velocity += vel;
+	}
+
 private:
 	void accelerate(const v3f &target_speed, const f32 max_increase_H,
 			const f32 max_increase_V, const bool use_pitch);
@@ -194,6 +199,7 @@ private:
 	float m_zoom_fov = 0.0f;
 	bool m_autojump = false;
 	float m_autojump_time = 0.0f;
+	v3f added_velocity = v3f(0.0f, 0.0f, 0.0f); // cleared on each move()
 
 	GenericCAO *m_cao = nullptr;
 	Client *m_client;