improved particle system from 90ms to ~ 0.7ms

1 files changed, 30 insertions, 12 deletions

diff --git a/src/crepe/ParticleSystem.cpp b/src/crepe/ParticleSystem.cpp
index f3cb939..aff7a30 100644
--- a/src/crepe/ParticleSystem.cpp
+++ b/src/crepe/ParticleSystem.cpp
@@ -9,30 +9,32 @@
 ParticleSystem::ParticleSystem() : m_elapsedTime(0.0f) {}  // Initialize m_elapsedTime to 0
 
 void ParticleSystem::update(float deltaTime, std::vector<ParticleEmitter>& emitters) {
+    // std::cout << "ParticleSystem update" << std::endl;
     for (ParticleEmitter& emitter : emitters) {
         float updateAmount = 1/static_cast<float>(emitter.m_emissionRate);
         for (float i = 0; i < deltaTime; i += updateAmount)
         {
             emitParticle(emitter);
         }
+        //  std::cout << "after emit" << std::endl;
         
         //update/move particles afterwards delete if not alive.
-        std::vector<Particle>::iterator it = emitter.particles.begin();
-        while (it != emitter.particles.end()) {
-            it->update(deltaTime);
-            if (!it->isAlive()) {
-                it = emitter.particles.erase(it);
-            } else {
-                ++it;
+        for (size_t j = 0; j <  emitter.particles.size(); j++)
+        {
+            // std::cout << "update" << std::endl;
+            if(emitter.particles[j].active)
+            {
+                emitter.particles[j].update(deltaTime);
             }
-        }
+        }     
+
 
     }
 }
 
 void ParticleSystem::emitParticle(ParticleEmitter& emitter) {
     // std::cout << "new emitter:" << std::endl;
-    Particle::Position initialPosition = { emitter.m_position.x, emitter.m_position.y };
+    Position initialPosition = { emitter.m_position.x, emitter.m_position.y };
     float randomAngle = 0.0f;
     //check if value is overthe 360 degrees
     if(emitter.m_maxAngle < emitter.m_minAngle)
@@ -49,11 +51,27 @@ void ParticleSystem::emitParticle(ParticleEmitter& emitter) {
     float randomSpeedOffset = (static_cast<float>(std::rand()) / RAND_MAX) * (2 * emitter.m_speedOffset) - emitter.m_speedOffset;
     float velocityX = (emitter.m_speed + randomSpeedOffset) * std::cos(angleInRadians);
     float velocityY = (emitter.m_speed + randomSpeedOffset) * std::sin(angleInRadians);
-    Particle::Position initialVelocity = {
+    Position initialVelocity = {
         velocityX,
         velocityY
     };
     // std::cout << "emitter.m_endLifespan:" << emitter.m_endLifespan << std::endl;
-
-    emitter.particles.emplace_back(emitter.m_endLifespan, initialPosition, initialVelocity);
+    for (size_t i = 0; i < emitter.particles.size(); i++)
+    {
+        if(!emitter.particles[i].active)
+        {
+            // std::cout << "active " << emitter.particles[i].active << std::endl;
+            // std::cout << "lifespan " << emitter.particles[i].lifespan << std::endl;
+            // std::cout << "timeInLife " << emitter.particles[i].timeInLife << std::endl;
+            // std::cout << "emitter.m_endLifespan" << emitter.m_endLifespan << std::endl;
+            // std::cout << "initialPositionx" << initialPosition.x << std::endl;
+            // std::cout << "initialPositiony" << initialPosition.y << std::endl;
+            // std::cout << "initialVelocityx" << initialVelocity.x << std::endl;
+            // std::cout << "initialVelocityy" << initialVelocity.y << std::endl;
+            emitter.particles[i].reset(emitter.m_endLifespan, initialPosition, initialVelocity);
+            break;
+        }
+    }
+    
+    //emitter.particles.emplace_back(emitter.m_endLifespan, initialPosition, initialVelocity);
 }