Defacto: OpenGLParticleSystem.cpp Source File

00001 
00007 #include "OpenGLParticleSystem.h"
00008 
00009 void OpenGLParticleSystem::draw() {
00010 
00011                 Vec3 v;
00012 
00013 
00014                 glBegin(GL_QUADS);
00015                 for (int i=0; i<MAX_PARTICLES; i++) {
00016                         if (m_particles[i].m_age >= 0.0f) {
00017 
00018                                 glColor4f(      m_particles[i].m_color.x,
00019                                                         m_particles[i].m_color.y,
00020                                                         m_particles[i].m_color.z,
00021                                                         m_particles[i].m_alpha          );
00022 
00023 
00024 
00025                                 glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0, 0);
00026                                 glVertex3f(
00027                                                         m_particles[i].m_location.x-m_particles[i].m_size,
00028                                                         m_particles[i].m_location.y-m_particles[i].m_size,
00029                                                         m_particles[i].m_location.z     );
00030 
00031                                 glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0, 1);
00032                                 glVertex3f(
00033                                                         m_particles[i].m_location.x-m_particles[i].m_size,
00034                                                         m_particles[i].m_location.y+m_particles[i].m_size,
00035                                                         m_particles[i].m_location.z     );
00036 
00037                                 glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1, 1);
00038                                 glVertex3f(
00039                                                         m_particles[i].m_location.x+m_particles[i].m_size,
00040                                                         m_particles[i].m_location.y+m_particles[i].m_size,
00041                                                         m_particles[i].m_location.z     );
00042 
00043                                 glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1, 0);
00044                                 glVertex3f(
00045                                                         m_particles[i].m_location.x+m_particles[i].m_size,
00046                                                         m_particles[i].m_location.y-m_particles[i].m_size,
00047                                                         m_particles[i].m_location.z     );
00048 
00049                         }
00050                 }
00051                 glEnd();
00052 
00053 }
00054 
00055 bool OpenGLParticleSystem::drawAndUpdate(Camera *camera, float dTime, bool absoluteTime, bool billboard) {
00056         if (absoluteTime) {
00057                 float time = dTime;
00058                 dTime = dTime - m_timeLastUpdate;
00059                 m_timeLastUpdate = time;
00060         }
00061 
00062         if (!m_alive && m_particlesAlive == 0)
00063                 return true;
00064 
00065         // move the emitter around
00066         if (m_isMoving) {
00067                 static float thetaHoriz = 0.0f;
00068                 static float thetaVert = 180.0f;
00069 
00070                 thetaHoriz += 250.0f * dTime;
00071                 thetaVert += 30.0f * dTime;
00072 
00073                 if (thetaHoriz > 350.0f)
00074                         thetaHoriz = 0.0f;
00075 
00076                 if (thetaVert > 359.0f)
00077                         thetaVert = 0.0f;
00078 
00079                 m_location.x = m_baseLocation.x + 0.5f*(float)cos(thetaHoriz*0.01745f);
00080                 //m_location.y = 50.0f+30.0f*(float)sin(thetaVert*0.1745f);
00081                 m_location.z = m_baseLocation.z + 0.5f*(float)sin(thetaHoriz*0.01645f);
00082         }
00083         else {
00084                 //m_location.x = 0.0f;
00085                 //m_location.y = 10.0f;
00086                 //m_location.z = 0.0f;
00087         }
00088 
00089         m_particlesAlive = 0;
00090 
00091         float mat[16];
00092         glGetFloatv(GL_MODELVIEW_MATRIX, mat);
00093 
00094         Vec3 vRight(mat[0], mat[4], mat[8]);
00095         Vec3 vUp(mat[1], mat[5], mat[9]);
00096         Vec3 vPoint0, vPoint1, vPoint2, vPoint3;
00097         Vec3 vCenter;
00098 
00099         glBegin(GL_QUADS);
00100         for (int i=0; i<MAX_PARTICLES; i++) {
00101                 if (m_particles[i].m_age >= 0.0f) {
00102                         if (m_particles[i].update(dTime)) {
00103                                 m_particlesAlive++;
00104 
00105                                 if (billboard) {
00106                                         vCenter = m_particles[i].m_location;
00107 
00108                                         vPoint0 = vCenter + ((-vRight - vUp) * m_particles[i].m_size);
00109                                         vPoint1 = vCenter + (( vRight - vUp) * m_particles[i].m_size );
00110                                         vPoint2 = vCenter + (( vRight + vUp) * m_particles[i].m_size );
00111                                         vPoint3 = vCenter + ((-vRight + vUp) * m_particles[i].m_size );
00112 
00113                                         glColor4f(      m_particles[i].m_color.x,
00114                                                                 m_particles[i].m_color.y,
00115                                                                 m_particles[i].m_color.z,
00116                                                                 m_particles[i].m_alpha          );
00117 
00118 
00119                                         glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0, 0);
00120                                         glVertex3fv(vPoint0);
00121 
00122                                         glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0, 1);
00123                                         glVertex3fv(vPoint1);
00124 
00125                                         glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1, 1);
00126                                         glVertex3fv(vPoint2);
00127 
00128                                         glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1, 0);
00129                                         glVertex3fv(vPoint3);
00130 
00131                                 }
00132                                 else {
00133 
00134                                         glColor4f(      m_particles[i].m_color.x,
00135                                                                 m_particles[i].m_color.y,
00136                                                                 m_particles[i].m_color.z,
00137                                                                 m_particles[i].m_alpha          );
00138 
00139                                         glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0, 0);
00140                                         glVertex3f(
00141                                                                 m_particles[i].m_location.x-m_particles[i].m_size,
00142                                                                 m_particles[i].m_location.y-m_particles[i].m_size,
00143                                                                 m_particles[i].m_location.z     );
00144 
00145                                         glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0, 1);
00146                                         glVertex3f(
00147                                                                 m_particles[i].m_location.x-m_particles[i].m_size,
00148                                                                 m_particles[i].m_location.y+m_particles[i].m_size,
00149                                                                 m_particles[i].m_location.z     );
00150 
00151                                         glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1, 1);
00152                                         glVertex3f(
00153                                                                 m_particles[i].m_location.x+m_particles[i].m_size,
00154                                                                 m_particles[i].m_location.y+m_particles[i].m_size,
00155                                                                 m_particles[i].m_location.z     );
00156 
00157                                         glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1, 0);
00158                                         glVertex3f(
00159                                                                 m_particles[i].m_location.x+m_particles[i].m_size,
00160                                                                 m_particles[i].m_location.y-m_particles[i].m_size,
00161                                                                 m_particles[i].m_location.z     );
00162                                 }
00163                         }
00164                 }
00165         }
00166         glEnd();
00167 
00168 
00169         if (!m_alive)
00170                 return true;
00171 
00172 
00173         float particlesNeeded = m_particlesPerSec*dTime + m_emissionResidue;
00174 
00175         unsigned int particlesCreated = (unsigned int)particlesNeeded;
00176 
00177         if (!m_isSuppressed) {
00178                 m_emissionResidue = particlesNeeded - particlesCreated;
00179         }
00180         else {
00181                 m_emissionResidue = particlesNeeded;
00182                 particlesCreated = 0;
00183         }
00184 
00185 
00186         // create more?
00187         if (particlesCreated > 0) {
00188                 for (i=0; i<MAX_PARTICLES; i++) {
00189                         if (!particlesCreated)
00190                                 break;
00191 
00192                         // not in use (= use this)
00193                         if (m_particles[i].m_age < 0.0f) {
00194                                 m_particles[i].m_age = 0.0f;
00195                                 m_particles[i].m_lifetime = m_life + RANDOM_NUM * m_lifeVar;
00196                                 Clamp(m_particles[i].m_lifetime, MIN_LIFETIME, MAX_LIFETIME);
00197 
00198                                 m_particles[i].m_color.x = m_colorStart.x + RANDOM_NUM * m_colorVar.x;
00199                                 m_particles[i].m_color.y = m_colorStart.y + RANDOM_NUM * m_colorVar.y;
00200                                 m_particles[i].m_color.z = m_colorStart.z + RANDOM_NUM * m_colorVar.z;
00201                                 m_particles[i].m_color.w = 1.0f;
00202 
00203                                 Clamp(m_particles[i].m_color.x, 0.0f, 1.0f);
00204                                 Clamp(m_particles[i].m_color.y, 0.0f, 1.0f);
00205                                 Clamp(m_particles[i].m_color.z, 0.0f, 1.0f);
00206 
00207                                 m_particles[i].m_dColor.x = (m_colorEnd.x - m_particles[i].m_color.x)/m_particles[i].m_lifetime;
00208                                 m_particles[i].m_dColor.y = (m_colorEnd.y - m_particles[i].m_color.y)/m_particles[i].m_lifetime;
00209                                 m_particles[i].m_dColor.z = (m_colorEnd.z - m_particles[i].m_color.z)/m_particles[i].m_lifetime;
00210 
00211                                 m_particles[i].m_alpha = m_alphaStart + RANDOM_NUM*m_alphaVar;
00212                                 Clamp(m_particles[i].m_alpha, MIN_ALPHA, MAX_ALPHA);
00213                                 m_particles[i].m_dAlpha = (m_alphaEnd - m_particles[i].m_alpha) / m_particles[i].m_lifetime;
00214 
00215                                 m_particles[i].m_size = m_sizeStart + RANDOM_NUM*m_sizeVar;
00216                                 Clamp(m_particles[i].m_size, MIN_SIZE, MAX_SIZE);
00217                                 m_particles[i].m_dSize = (m_sizeEnd - m_particles[i].m_size) / m_particles[i].m_lifetime;
00218 
00219                                 m_particles[i].m_size *= 0.01f;
00220                                 m_particles[i].m_dSize *= 0.01f;
00221 
00222 
00223                                 m_particles[i].m_gravity = m_gravityStart*9.82f + RANDOM_NUM*m_gravityVar*9.82f;
00224                                 Clamp(m_particles[i].m_gravity, MIN_GRAVITY*9.82f, MAX_GRAVITY*9.82f);
00225                                 m_particles[i].m_dGravity = (m_gravityEnd*9.82f - m_particles[i].m_gravity) / m_particles[i].m_lifetime;
00226 
00227                                 m_particles[i].m_gravity *= 0.01f;
00228                                 m_particles[i].m_dGravity *= 0.01f;
00229 
00230 
00231                                 Vec3 tmpVelocity = (m_location - m_prevLocation)/dTime;
00232 
00233                                 m_particles[i].m_location = m_prevLocation + tmpVelocity*RANDOM_NUM*dTime;
00234 
00235                                 m_particles[i].m_prevLocation = m_location;
00236 
00237                                 float randomYaw = RANDOM_NUM*3.14159f*2.0f;
00238                                 float randomPitch = RANDOM_NUM*m_theta*3.14159f/180.0f;
00239 
00240                                 m_particles[i].m_velocity.y = cosf(randomPitch);
00241                                 m_particles[i].m_velocity.x = sinf(randomPitch)*cosf(randomYaw);
00242                                 m_particles[i].m_velocity.z = sinf(randomPitch)*sinf(randomYaw);
00243 
00244                                 //m_particles[i].m_velocity.y *= 0.01f;
00245                                 //m_particles[i].m_velocity.x *= 0.01f;
00246                                 //m_particles[i].m_velocity.z *= 0.01f;
00247 
00248                                 float newSpeed = m_speed + RANDOM_NUM*m_speedVar;
00249                                 Clamp(newSpeed, MIN_SPEED, MAX_SPEED);
00250 
00251                                 m_particles[i].m_velocity *= newSpeed;
00252 
00253                                 m_particles[i].m_velocity *= 0.01f;
00254 
00255                                 m_particles[i].setParent(this);
00256 
00257                                 particlesCreated--;
00258                         }
00259                 }
00260         }
00261 
00262         m_prevLocation = m_location;
00263 
00264         return true;
00265 }