ParticleSpawner::step cleanup and rotation fix (#6486)

* Particles: Move spawner code to a separate fucntion

2 files changed, 75 insertions, 114 deletions

diff --git a/src/particles.cpp b/src/particles.cpp
index c588fa7a7..053b68fff 100644
--- a/src/particles.cpp
+++ b/src/particles.cpp
@@ -281,6 +281,58 @@ ParticleSpawner::ParticleSpawner(IGameDef *gamedef, LocalPlayer *player,
 	}
 }
 
+void ParticleSpawner::spawnParticle(ClientEnvironment *env, float radius,
+	bool is_attached, const v3f &attached_pos, float attached_yaw)
+{
+	v3f ppos = m_player->getPosition() / BS;
+	v3f pos = random_v3f(m_minpos, m_maxpos);
+
+	// Need to apply this first or the following check
+	// will be wrong for attached spawners
+	if (is_attached) {
+		pos.rotateXZBy(attached_yaw);
+		pos += attached_pos;
+	}
+
+	if (pos.getDistanceFrom(ppos) > radius)
+		return;
+
+	v3f vel = random_v3f(m_minvel, m_maxvel);
+	v3f acc = random_v3f(m_minacc, m_maxacc);
+
+	if (is_attached) {
+		// Apply attachment yaw
+		vel.rotateXZBy(attached_yaw);
+		acc.rotateXZBy(attached_yaw);
+	}
+
+	float exptime = rand() / (float)RAND_MAX
+			* (m_maxexptime - m_minexptime)
+			+ m_minexptime;
+	float size = rand() / (float)RAND_MAX
+			* (m_maxsize - m_minsize)
+			+ m_minsize;
+
+	m_particlemanager->addParticle(new Particle(
+		m_gamedef,
+		m_player,
+		env,
+		pos,
+		vel,
+		acc,
+		exptime,
+		size,
+		m_collisiondetection,
+		m_collision_removal,
+		m_vertical,
+		m_texture,
+		v2f(0.0, 0.0),
+		v2f(1.0, 1.0),
+		m_animation,
+		m_glow
+	));
+}
+
 void ParticleSpawner::step(float dtime, ClientEnvironment* env)
 {
 	m_time += dtime;
@@ -302,128 +354,33 @@ void ParticleSpawner::step(float dtime, ClientEnvironment* env)
 		}
 	}
 
-	if (m_spawntime != 0) // Spawner exists for a predefined timespan
-	{
-		for(std::vector<float>::iterator i = m_spawntimes.begin();
-				i != m_spawntimes.end();)
-		{
-			if ((*i) <= m_time && m_amount > 0)
-			{
+	if (m_spawntime != 0) {
+		// Spawner exists for a predefined timespan
+		for (std::vector<float>::iterator i = m_spawntimes.begin();
+				i != m_spawntimes.end();) {
+			if ((*i) <= m_time && m_amount > 0) {
 				m_amount--;
 
 				// Pretend to, but don't actually spawn a particle if it is
 				// attached to an unloaded object or distant from player.
-				if (!unloaded) {
-					v3f ppos = m_player->getPosition() / BS;
-					v3f pos = random_v3f(m_minpos, m_maxpos);
-
-					// Need to apply this first or the following check
-					// will be wrong for attached spawners
-					if (is_attached)
-						pos += attached_pos;
-
-					if (pos.getDistanceFrom(ppos) <= radius) {
-						v3f vel = random_v3f(m_minvel, m_maxvel);
-						v3f acc = random_v3f(m_minacc, m_maxacc);
-
-						if (is_attached) {
-							// Apply attachment yaw and position
-							pos.rotateXZBy(attached_yaw);
-							vel.rotateXZBy(attached_yaw);
-							acc.rotateXZBy(attached_yaw);
-						}
-
-						float exptime = rand()/(float)RAND_MAX
-								*(m_maxexptime-m_minexptime)
-								+m_minexptime;
-						float size = rand()/(float)RAND_MAX
-								*(m_maxsize-m_minsize)
-								+m_minsize;
-
-						Particle* toadd = new Particle(
-							m_gamedef,
-							m_player,
-							env,
-							pos,
-							vel,
-							acc,
-							exptime,
-							size,
-							m_collisiondetection,
-							m_collision_removal,
-							m_vertical,
-							m_texture,
-							v2f(0.0, 0.0),
-							v2f(1.0, 1.0),
-							m_animation,
-							m_glow);
-						m_particlemanager->addParticle(toadd);
-					}
-				}
+				if (!unloaded)
+					spawnParticle(env, radius, is_attached, attached_pos, attached_yaw);
+
 				i = m_spawntimes.erase(i);
-			}
-			else
-			{
+			} else {
 				++i;
 			}
 		}
-	}
-	else // Spawner exists for an infinity timespan, spawn on a per-second base
-	{
+	} else {
+		// Spawner exists for an infinity timespan, spawn on a per-second base
+
 		// Skip this step if attached to an unloaded object
 		if (unloaded)
 			return;
-		for (int i = 0; i <= m_amount; i++)
-		{
-			if (rand()/(float)RAND_MAX < dtime)
-			{
-				// Do not spawn particle if distant from player
-				v3f ppos = m_player->getPosition() / BS;
-				v3f pos = random_v3f(m_minpos, m_maxpos);
-
-				// Need to apply this first or the following check
-				// will be wrong for attached spawners
-				if (is_attached)
-					pos += attached_pos;
-
-				if (pos.getDistanceFrom(ppos) <= radius) {
-					v3f vel = random_v3f(m_minvel, m_maxvel);
-					v3f acc = random_v3f(m_minacc, m_maxacc);
-
-					if (is_attached) {
-						// Apply attachment yaw and position
-						pos.rotateXZBy(attached_yaw);
-						vel.rotateXZBy(attached_yaw);
-						acc.rotateXZBy(attached_yaw);
-					}
-
-					float exptime = rand()/(float)RAND_MAX
-							*(m_maxexptime-m_minexptime)
-							+m_minexptime;
-					float size = rand()/(float)RAND_MAX
-							*(m_maxsize-m_minsize)
-							+m_minsize;
-
-					Particle* toadd = new Particle(
-						m_gamedef,
-						m_player,
-						env,
-						pos,
-						vel,
-						acc,
-						exptime,
-						size,
-						m_collisiondetection,
-						m_collision_removal,
-						m_vertical,
-						m_texture,
-						v2f(0.0, 0.0),
-						v2f(1.0, 1.0),
-						m_animation,
-						m_glow);
-					m_particlemanager->addParticle(toadd);
-				}
-			}
+
+		for (int i = 0; i <= m_amount; i++) {
+			if (rand() / (float)RAND_MAX < dtime)
+				spawnParticle(env, radius, is_attached, attached_pos, attached_yaw);
 		}
 	}
 }
diff --git a/src/particles.h b/src/particles.h
index 11ccd6218..72e48911a 100644
--- a/src/particles.h
+++ b/src/particles.h
@@ -114,7 +114,7 @@ private:
 
 class ParticleSpawner
 {
-	public:
+public:
 	ParticleSpawner(IGameDef* gamedef,
 		LocalPlayer *player,
 		u16 amount,
@@ -140,8 +140,12 @@ class ParticleSpawner
 	bool get_expired ()
 	{ return (m_amount <= 0) && m_spawntime != 0; }
 
-	private:
-	ParticleManager* m_particlemanager;
+private:
+	void spawnParticle(ClientEnvironment *env, float radius,
+			bool is_attached, const v3f &attached_pos,
+			float attached_yaw);
+
+	ParticleManager *m_particlemanager;
 	float m_time;
 	IGameDef *m_gamedef;
 	LocalPlayer *m_player;