ParticleSystem.cpp

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#include "ParticleSystem.h"

ParticleSystem::ParticleSystem() {
        m_age = 0.0f;
        m_timeLastUpdate = 0.0f;
        m_emissionResidue = 0.0f;
        m_direction = Vec3(0, 0, 0);
        die();
}

ParticleSystem::~ParticleSystem() {
}

bool ParticleSystem::update(float dTime, bool absoluteTime) {
        if (absoluteTime) {
                float time = dTime;
                dTime = dTime - m_timeLastUpdate;
                m_timeLastUpdate = time;
        }

        // move the emitter around
        if (m_isMoving) {
                static float thetaHoriz = 0.0f;
                static float thetaVert = 180.0f;

                thetaHoriz += 50.0f * dTime;
                thetaVert += 30.0f * dTime;

                if (thetaHoriz > 350.0f)
                        thetaHoriz = 0.0f;

                if (thetaVert > 359.0f)
                        thetaVert = 0.0f;

                m_location.x = 30.0f*(float)cos(thetaHoriz*0.01745f);
                m_location.y = 50.0f+30.0f*(float)sin(thetaVert*0.1745f);
                m_location.z = 30.0f*(float)sin(thetaHoriz*0.01645f);
        }
        else {
                //m_location.x = 0.0f;
                //m_location.y = 10.0f;
                //m_location.z = 0.0f;
        }

        m_particlesAlive = 0;

        for (int i=0; i<MAX_PARTICLES; i++) {
                if (m_particles[i].m_age >= 0.0f)
                        if (m_particles[i].update(dTime))
                                m_particlesAlive++;
        }

        float particlesNeeded = m_particlesPerSec*dTime + m_emissionResidue;

        unsigned int particlesCreated = (unsigned int)particlesNeeded;

        if (!m_isSuppressed) {
                m_emissionResidue = particlesNeeded - particlesCreated;
        }
        else {
                m_emissionResidue = particlesNeeded;
                particlesCreated = 0;
        }

        // create more?
        if (particlesCreated > 0) {
                for (i=0; i<MAX_PARTICLES; i++) {
                        if (!particlesCreated)
                                break;

                        // not in use (= use this)
                        if (m_particles[i].m_age < 0.0f) {
                                m_particles[i].m_age = 0.0f;
                                m_particles[i].m_lifetime = m_life + RANDOM_NUM * m_lifeVar;
                                Clamp(m_particles[i].m_lifetime, MIN_LIFETIME, MAX_LIFETIME);

                                m_particles[i].m_color.x = m_colorStart.x + RANDOM_NUM * m_colorVar.x;
                                m_particles[i].m_color.y = m_colorStart.y + RANDOM_NUM * m_colorVar.y;
                                m_particles[i].m_color.z = m_colorStart.z + RANDOM_NUM * m_colorVar.z;
                                m_particles[i].m_color.w = 1.0f;

                                Clamp(m_particles[i].m_color.x, 0.0f, 1.0f);
                                Clamp(m_particles[i].m_color.y, 0.0f, 1.0f);
                                Clamp(m_particles[i].m_color.z, 0.0f, 1.0f);

                                m_particles[i].m_dColor.x = (m_colorEnd.x - m_particles[i].m_color.x)/m_particles[i].m_lifetime;
                                m_particles[i].m_dColor.y = (m_colorEnd.y - m_particles[i].m_color.y)/m_particles[i].m_lifetime;
                                m_particles[i].m_dColor.z = (m_colorEnd.z - m_particles[i].m_color.z)/m_particles[i].m_lifetime;

                                m_particles[i].m_alpha = m_alphaStart + RANDOM_NUM*m_alphaVar;
                                Clamp(m_particles[i].m_alpha, MIN_ALPHA, MAX_ALPHA);
                                m_particles[i].m_dAlpha = (m_alphaEnd - m_particles[i].m_alpha) / m_particles[i].m_lifetime;

                                m_particles[i].m_size = m_sizeStart + RANDOM_NUM*m_sizeVar;
                                Clamp(m_particles[i].m_size, MIN_SIZE, MAX_SIZE);
                                m_particles[i].m_dSize = (m_sizeEnd - m_particles[i].m_size) / m_particles[i].m_lifetime;

                                m_particles[i].m_gravity = m_gravityStart*9.82f + RANDOM_NUM*m_gravityVar*9.82f;
                                Clamp(m_particles[i].m_gravity, MIN_GRAVITY*9.82f, MAX_GRAVITY*9.82f);
                                m_particles[i].m_dGravity = (m_gravityEnd*9.82f - m_particles[i].m_gravity) / m_particles[i].m_lifetime;

                                Vec3 tmpVelocity = (m_location - m_prevLocation)/dTime;

                                m_particles[i].m_location = m_prevLocation + tmpVelocity*RANDOM_NUM*dTime;

                                m_particles[i].m_prevLocation = m_location;

                                float randomYaw = RANDOM_NUM*3.14159f*2.0f;
                                float randomPitch = RANDOM_NUM*m_theta*3.14159f/180.0f;

                                m_particles[i].m_velocity.y = cosf(randomPitch);
                                m_particles[i].m_velocity.x = sinf(randomPitch)*cosf(randomYaw);
                                m_particles[i].m_velocity.z = sinf(randomPitch)*sinf(randomYaw);

                                float newSpeed = m_speed + RANDOM_NUM*m_speedVar;
                                Clamp(newSpeed, MIN_SPEED, MAX_SPEED);
                                
                                m_particles[i].m_velocity *= newSpeed;

                                m_particles[i].setParent(this);

                                particlesCreated--;
                        }
                }
        }

        m_prevLocation = m_location;

        return true;
}

void ParticleSystem::move(Vec3 location) {
        m_baseLocation = location;
        m_prevLocation = m_location;
        m_location = location;
}

bool ParticleSystem::isMoving() {
        return m_isMoving;
}

bool ParticleSystem::isColliding() {
        return m_isColliding;
}

bool ParticleSystem::isAttractive() {
        return m_isAttractive;
}

void ParticleSystem::getLocation(Vec3 &location) {
        location = m_location;
}

unsigned int ParticleSystem::numParticles() {
        return m_particlesAlive;
}

void ParticleSystem::setRenderer(void *renderer) {
        m_renderer = renderer;
}

void ParticleSystem::loadPreset(unsigned int preset) {
        switch (preset) {
                case 0:
                        m_colorStart.x  = 1.0f;
                        m_colorStart.y  = 0.8f;
                        m_colorStart.z  = 0.5f;
                        
                        m_colorVar.x    = 0.0f;
                        m_colorVar.y    = 0.0f;
                        m_colorVar.z    = 0.0f;

                        m_colorEnd.x    = 0.0f;
                        m_colorEnd.y    = 0.0f;
                        m_colorEnd.z    = 1.0f;

                        m_alphaStart            = 0.5f;
                        m_alphaVar              = 0.0f;
                        m_alphaEnd              = 0.0f;

                        m_sizeStart             = 4.0f;
                        m_sizeVar               = 0.0f;
                        m_sizeEnd               = 8.0f;

                        m_speed                 = 15.0f;
                        m_speedVar              = 0.0f;

                        m_theta                 = 180.0f;
                        
                        m_life          = 1.0f;
                        m_lifeVar       = 0.5f;

                        m_gravityStart  = 0.0f;
                        m_gravityVar            = 0.0f;
                        m_gravityEnd            = 0.0f;

                        m_particlesPerSec       = 80;

                        m_isMoving              = FALSE;
                        m_isAttractive  = FALSE;
                        m_isColliding   = FALSE;

                        //m_textureID = 0;
                        break;

                case 1:
                        m_colorStart.x  = 1.0f;
                        m_colorStart.y  = 1.0f;
                        m_colorStart.z  = 0.2f;
                        
                        m_colorVar.x    = 0.0f;
                        m_colorVar.y    = 0.0f;
                        m_colorVar.z    = 0.0f;

                        m_colorEnd.x    = 1.0f;
                        m_colorEnd.y    = 0.0f;
                        m_colorEnd.z    = 0.0f;

                        m_alphaStart            = 1.0f;
                        m_alphaVar              = 0.0f;
                        m_alphaEnd              = 0.0f;

                        m_sizeStart             = 0.5f;
                        m_sizeVar               = 0.0f;
                        m_sizeEnd               = 10.0f;

                        m_speed                 = 0.0f;
                        m_speedVar              = 0.0f;

                        m_theta                 = 0.0f;
                        
                        m_life          = 2.0f;
                        m_lifeVar       = 0.0f;

                        m_gravityStart  = 1.0f;
                        m_gravityVar            = 0.0f;
                        m_gravityEnd            = 1.0f;

                        m_particlesPerSec       = 100;

                        m_isMoving              = TRUE;
                        m_isAttractive  = FALSE;
                        m_isColliding   = TRUE;

                        //m_textureID = 0;
                        break;

                case 2:
                        m_colorStart.x  = 1.0f;
                        m_colorStart.y  = 1.0f;
                        m_colorStart.z  = 1.0f;
                        
                        m_colorVar.x    = 0.0f;
                        m_colorVar.y    = 0.0f;
                        m_colorVar.z    = 0.0f;

                        m_colorEnd.x    = 0.0f;
                        m_colorEnd.y    = 0.0f;
                        m_colorEnd.z    = 1.0f;

                        m_alphaStart    = 1.0f;
                        m_alphaVar              = 0.0f;
                        m_alphaEnd              = 0.0f;

                        m_sizeStart             = 4.0f;
                        m_sizeVar               = 0.0f;
                        m_sizeEnd               = 0.5f;

                        m_speed                 = 60.0f;
                        m_speedVar              = 10.0f;

                        m_theta                 = 35.0f;
                        
                        m_life                  = 4.0f;
                        m_lifeVar               = 0.0f;

                        m_gravityStart  = 0.0f;
                        m_gravityVar    = 0.0f;
                        m_gravityEnd    = 4.0f;

                        m_particlesPerSec       = 150;

                        m_isMoving              = FALSE;
                        m_isAttractive  = FALSE;
                        m_isColliding   = TRUE;

                        //m_textureID = 0;
                        break;

                case 3:
                        m_colorStart.x  = 0.0f;
                        m_colorStart.y  = 1.0f;
                        m_colorStart.z  = 0.0f;
                        
                        m_colorVar.x    = 0.5f;
                        m_colorVar.y    = 0.5f;
                        m_colorVar.z    = 0.5f;

                        m_colorEnd.x    = 1.0f;
                        m_colorEnd.y    = 1.0f;
                        m_colorEnd.z    = 1.0f;

                        m_alphaStart            = 1.0f;
                        m_alphaVar              = 0.0f;
                        m_alphaEnd              = 1.0f;

                        m_sizeStart             = 10.0f;
                        m_sizeVar               = 0.0f;
                        m_sizeEnd               = 5.0f;

                        m_speed                 = 50.0f;
                        m_speedVar              = 0.0f;

                        m_theta                 = 180.0f;
                        
                        m_life                  = 4.0f;
                        m_lifeVar               = 0.0f;

                        m_gravityStart  = 0.0f;
                        m_gravityVar            = 0.0f;
                        m_gravityEnd            = 0.0f;

                        m_particlesPerSec       = 80;

                        m_isMoving              = FALSE;
                        m_isAttractive  = TRUE;
                        m_isColliding   = FALSE;

                        //m_textureID = 0;
                        break;
        
                case 4:
                        m_colorStart.x  = 1.0f;
                        m_colorStart.y  = 1.0f;
                        m_colorStart.z  = 1.0f;

                        m_colorVar.x    = 0.1f;
                        m_colorVar.y    = 0.1f;
                        m_colorVar.z    = 0.1f;

                        m_colorEnd.x    = 0.0f;
                        m_colorEnd.y    = 0.0f;
                        m_colorEnd.z    = 1.0f;

                        m_alphaStart    = 0.7f;
                        m_alphaVar              = 0.0f;
                        m_alphaEnd              = 0.0f;

                        m_sizeStart             = 2.0f;
                        m_sizeVar               = 0.1f;
                        m_sizeEnd               = 10.0f;

                        m_speed                 = 8.0f;
                        m_speedVar              = 0.0f;

                        m_theta                 = 180.0f;
                        
                        m_life                  = 2.0f;
                        m_lifeVar               = 0.0f;

                        m_gravityStart  = 0.0f;
                        m_gravityVar    = 0.0f;
                        m_gravityEnd    = 0.0f;

                        m_particlesPerSec       = 45;

                        m_isMoving              = FALSE;
                        m_isAttractive  = FALSE;
                        m_isColliding   = FALSE;

                        //m_textureID = 0;
                        break;

                case 5:
                        m_colorStart.x  = 0.0f;
                        m_colorStart.y  = 0.0f;
                        m_colorStart.z  = 0.0f;
                        
                        m_colorVar.x    = 0.0f;
                        m_colorVar.y    = 0.0f;
                        m_colorVar.z    = 0.0f;

                        m_colorEnd.x    = 0.5f;
                        m_colorEnd.y    = 0.5f;
                        m_colorEnd.z    = 0.5f;

                        m_alphaStart    = 0.0f;
                        m_alphaVar              = 0.5f;
                        m_alphaEnd              = 0.0f;

                        m_sizeStart             = 35.0f;
                        m_sizeVar               = 20.0f;
                        m_sizeEnd               = 5.0f;

                        m_speed                 = 5.0f;
                        m_speedVar              = 1.5f;

                        m_theta                 = 70.0f;
                        
                        m_life                  = 2.0f;
                        m_lifeVar               = 0.0f;

                        m_gravityStart  = -0.15f;
                        m_gravityVar    = -0.35f;
                        m_gravityEnd    = -0.75f;

                        m_particlesPerSec       = 150;

                        m_isMoving              = FALSE;
                        m_isAttractive  = FALSE;
                        m_isColliding   = FALSE;

                        //m_textureID = 0;
                        break;

                case 6:
                        m_colorStart.x = 1.00f; 
                        m_colorStart.y = 1.00f; 
                        m_colorStart.z = 0.30f; 

                        m_colorVar.x = 0.00f; 
                        m_colorVar.y = 0.00f; 
                        m_colorVar.z = 0.00f; 

                        m_colorEnd.x = 0.70f; 
                        m_colorEnd.y = 0.30f; 
                        m_colorEnd.z = 0.00f; 

                        m_alphaStart = 0.96f; 
                        m_alphaVar   = 1.00f; 
                        m_alphaEnd   = 0.16f; 

                        m_sizeStart  = 2.74f; 
                        m_sizeVar    = 2.00f; 
                        m_sizeEnd    = 6.09f; 

                        m_speed      = 14.71f; 
                        m_speedVar   = 50.00f; 

                        m_theta     = 30.12f; 

                        m_life          = 0.77f; 
                        m_lifeVar       = 0.50f; 

                        m_gravityStart  = -0.69f; 
                        m_gravityVar    = 1.00f; 
                        m_gravityEnd    = -0.49f; 

                        m_particlesPerSec = 441; 

                        m_isMoving     = 0; 
                        m_isAttractive = 0; 
                        m_isColliding  = 0; 
                        
                        //m_textureID = 0; 
                        break;

                case 7:
                        m_colorStart.x = 0.00f; 
                        m_colorStart.y = 0.00f; 
                        m_colorStart.z = 0.00f; 

                        m_colorVar.x = 1.00f; 
                        m_colorVar.y = 1.00f; 
                        m_colorVar.z = 1.00f; 

                        m_colorEnd.x = 0.00f; 
                        m_colorEnd.y = 0.00f; 
                        m_colorEnd.z = 0.00f; 

                        m_alphaStart = 0.87f; 
                        m_alphaVar   = 1.00f; 
                        m_alphaEnd   = 0.89f; 

                        m_sizeStart  = 0.59f; 
                        m_sizeVar    = 0.00f; 
                        m_sizeEnd    = 9.35f; 

                        m_speed      = 188.73f; 
                        m_speedVar   = 10.00f; 
                        m_theta      = 54.71f; 

                        m_life       = 0.78f; 
                        m_lifeVar    = 0.00f; 

                        m_gravityStart  = -0.20f; 
                        m_gravityVar    = 0.00f; 
                        m_gravityEnd    = -0.20f; 

                        m_particlesPerSec = 676; 

                        m_isMoving     = 0; 
                        m_isAttractive = 0; 
                        m_isColliding  = 0; 

                        //m_textureID = 3; 
                        break;

                case PARTICLESYSTEM_SPAWN:
                        m_colorStart.x = 0.50f; 
                        m_colorStart.y = 0.80f; 
                        m_colorStart.z = 0.50f; 
                        
                        m_colorVar.x = 0.10f; 
                        m_colorVar.y = 0.10f; 
                        m_colorVar.z = 0.10f; 
                        
                        m_colorEnd.x = 0.00f; 
                        m_colorEnd.y = 0.70f; 
                        m_colorEnd.z = 0.00f; 
                        
                        m_alphaStart = 0.9f; 
                        m_alphaVar   = 0.00f; 
                        m_alphaEnd   = 0.0f; 
                        
                        m_sizeStart  = 4.50f; 
                        m_sizeVar    = 0.50f; 
                        m_sizeEnd    = 4.53f; 
                        
                        m_speed      = 100.00f; 
                        m_speedVar   = 5.00f; 
                        
                        m_theta      = 10.00f; 
                        
                        m_life       = 1.50f; 
                        m_lifeVar    = 0.20f; 
                        
                        m_gravityStart  = -0.29f; 
                        m_gravityVar    = 0.00f; 
                        m_gravityEnd    = 0.10f; 
                        
                        m_particlesPerSec = 59; 
                        
                        m_isMoving     = true; 
                        m_isAttractive = false; 
                        m_isColliding  = false; 
                        
                        //m_textureID = 2; 
                        break;


                case PARTICLESYSTEM_SUN:
                        m_colorStart.x = 1.00f; 
                        m_colorStart.y = 1.00f; 
                        m_colorStart.z = 0.30f; 

                        m_colorVar.x = 0.00f; 
                        m_colorVar.y = 0.00f; 
                        m_colorVar.z = 0.00f; 

                        m_colorEnd.x = 0.70f; 
                        m_colorEnd.y = 0.30f; 
                        m_colorEnd.z = 0.00f; 

                        m_alphaStart = 0.96f; 
                        m_alphaVar   = 1.00f; 
                        m_alphaEnd   = 0.16f; 

                        m_sizeStart             = 7.0f;
                        m_sizeVar               = 0.1f;
                        m_sizeEnd               = 7.0f;

                        m_speed                 = 7.0f;
                        m_speedVar              = 0.0f;

                        m_theta                 = 180.0f;
                        
                        m_life                  = 1.0f;
                        m_lifeVar               = 0.0f;

                        m_gravityStart  = 0.0f;
                        m_gravityVar    = 0.0f;
                        m_gravityEnd    = 0.0f;

                        m_particlesPerSec       = 25;

                        m_isMoving              = false;
                        m_isAttractive  = false;
                        m_isColliding   = false;

                        //m_textureID = 0;
                        break;



                default:
                        m_colorStart.x  = 1.0f;
                        m_colorStart.y  = 0.8f;
                        m_colorStart.z  = 0.5f;
                        
                        m_colorVar.x    = 0.0f;
                        m_colorVar.y    = 0.0f;
                        m_colorVar.z    = 0.0f;

                        m_colorEnd.x    = 0.0f;
                        m_colorEnd.y    = 0.0f;
                        m_colorEnd.z    = 1.0f;

                        m_alphaStart            = 0.5f;
                        m_alphaVar                      = 0.0f;
                        m_alphaEnd                      = 0.0f;

                        m_sizeStart             = 4.0f;
                        m_sizeVar                       = 0.0f;
                        m_sizeEnd                       = 8.0f;

                        m_speed                 = 15.0f;
                        m_speedVar                      = 0.0f;

                        m_theta                 = 180.0f;
                        
                        m_life          = 1.0f;
                        m_lifeVar       = 0.5f;

                        m_gravityStart          = 0.0f;
                        m_gravityVar            = 0.0f;
                        m_gravityEnd            = 0.0f;

                        m_particlesPerSec       = 80;

                        m_isMoving = FALSE;
                        m_isAttractive = FALSE;
                        m_isColliding = FALSE;

                        //m_textureID = 0;
                        break;
        }
}

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