//called to handle updating of a batch of particles given the appropriate properties
void CParticleSystemGroup::UpdateParticles(float tmFrame, const LTVector& vGravity, float fFrictionCoef, const LTRigidTransform& tObjTrans)
{
LTASSERT(m_pProps, "Error: Called UpdateParticles on an uninitialized particle group");
//track our performance
CTimedSystemBlock TimingBlock(g_tsClientFXParticles);
//get an iterator to our list of particles
CParticleReverseIterator itParticles = m_Particles.GetReverseIterator();
//bail if we have no particles
if(itParticles.IsDone())
return;
//find the coefficient of restitution to use for these particles in case they bounce
float fCOR = m_pProps->m_fBounceStrength;
//do our particles have infinite lifetime?
bool bInfiniteLife = m_pProps->m_bInfiniteLife;
//initialize our particle bounding box to extreme extents
static const float kfInfinity = FLT_MAX;
LTVector vMin = LTVector(kfInfinity, kfInfinity, kfInfinity);
LTVector vMax = LTVector(-kfInfinity, -kfInfinity, -kfInfinity);
LTVector vDefaultGravity = vGravity * tmFrame;
float fDefaultFriction = powf(fFrictionCoef, tmFrame);
//the current gravity and friction for us to use
LTVector vCurrGravity = vDefaultGravity;
float fCurrFriction = fDefaultFriction;
float fCurrUpdateTime = tmFrame;
//we now need to handle updating the particles. For performance reasons, this is broken apart
//into two update loops, one that handles bouncing/splat, another that doesn't
if(m_nNumRayTestParticles == 0)
{
//this is the non-bouncing update loop
while(!itParticles.IsDone())
{
SParticle* pParticle = (SParticle*)itParticles.GetParticle();
//update the lifetime
pParticle->m_fLifetime -= fCurrUpdateTime;
// Check for expiration
if( pParticle->m_fLifetime <= 0.0f )
{
if(pParticle->m_nUserData & PARTICLE_BATCH_MARKER)
{
//restore our defaults
if(pParticle->m_nUserData & PARTICLE_DEFAULT_BATCH)
{
//restore our defaults
vCurrGravity = vDefaultGravity;
fCurrFriction = fDefaultFriction;
fCurrUpdateTime = tmFrame;
}
else
{
//compute new values for us to use
vCurrGravity = vGravity * pParticle->m_fTotalLifetime;
fCurrFriction = powf(fFrictionCoef, pParticle->m_fTotalLifetime);
fCurrUpdateTime = pParticle->m_fTotalLifetime;
}
//do the direct remove (we know batch markers don't have bounce or splat)
itParticles = m_Particles.RemoveParticle(itParticles);
continue;
}
else if(bInfiniteLife)
{
//this particle has died, but resurrect it since it lives forever
pParticle->m_fLifetime = pParticle->m_fTotalLifetime - fmodf(-pParticle->m_fLifetime, pParticle->m_fTotalLifetime);
}
else
{
//remove the dead particle (can do direct version since we know we don't have splat or bounce)
itParticles = m_Particles.RemoveParticle(itParticles);
continue;
}
}
// Give the particle an update
//update the velocity, applying gravity and friction
pParticle->m_Velocity = pParticle->m_Velocity * fCurrFriction + vCurrGravity;
pParticle->m_Pos += pParticle->m_Velocity * fCurrUpdateTime;
// Update the angle if appropriate
pParticle->m_fAngle += pParticle->m_fAngularVelocity * fCurrUpdateTime;
//extend the bounding box
vMin.Min(pParticle->m_Pos);
vMax.Max(pParticle->m_Pos);
if(m_pProps->m_bStreak)
{
LTVector vStreakPt = pParticle->m_Pos - pParticle->m_Velocity * m_pProps->m_fStreakScale;
vMin.Min(vStreakPt);
vMax.Max(vStreakPt);
}
//and move onto the next particle
itParticles.Prev();
}
}
else
{
//this is the bouncing/splat update loop
IntersectQuery iQuery;
IntersectInfo iInfo;
//get the main world that we are going to test against
HOBJECT hMainWorld = g_pLTClient->GetMainWorldModel();
//cache the inverse object transform
LTRigidTransform tInvObjTrans = tObjTrans.GetInverse();
while(!itParticles.IsDone())
{
SParticle* pParticle = (SParticle*)itParticles.GetParticle();
//update the lifetime
pParticle->m_fLifetime -= fCurrUpdateTime;
// Check for expiration
if( pParticle->m_fLifetime <= 0.0f )
{
if(pParticle->m_nUserData & PARTICLE_BATCH_MARKER)
{
//restore our defaults
if(pParticle->m_nUserData & PARTICLE_DEFAULT_BATCH)
{
//restore our defaults
vCurrGravity = vDefaultGravity;
fCurrFriction = fDefaultFriction;
fCurrUpdateTime = tmFrame;
}
else
{
//compute new values for us to use
vCurrGravity = vGravity * pParticle->m_fTotalLifetime;
fCurrFriction = powf(fFrictionCoef, pParticle->m_fTotalLifetime);
fCurrUpdateTime = pParticle->m_fTotalLifetime;
}
//do the direct remove (we know batch markers don't have bounce or splat)
itParticles = m_Particles.RemoveParticle(itParticles);
continue;
}
else if(bInfiniteLife)
{
//this particle has died, but resurrect it since it lives forever
pParticle->m_fLifetime = pParticle->m_fTotalLifetime - fmodf(-pParticle->m_fLifetime, pParticle->m_fTotalLifetime);
}
else
{
//remove the dead particle (can't do direct version since it might have splat or bounce)
itParticles = RemoveParticle(itParticles);
continue;
}
}
// Give the particle an update
//update the velocity, applying gravity and friction
pParticle->m_Velocity = pParticle->m_Velocity * fCurrFriction + vCurrGravity;
// Update the angle if appropriate
pParticle->m_fAngle += pParticle->m_fAngularVelocity * fCurrUpdateTime;
//determine where the particle should be moving to
LTVector vDestPos = pParticle->m_Pos + pParticle->m_Velocity * fCurrUpdateTime;
//we now need to compute the new position of the particle
if(pParticle->m_nUserData & (PARTICLE_BOUNCE | PARTICLE_SPLAT))
{
LTVector vParticlePos = pParticle->m_Pos;
LTVector vParticleDest = vDestPos;
//do all intersections in world space
if(m_pProps->m_bObjectSpace)
{
tObjTrans.Transform(pParticle->m_Pos, vParticlePos);
tObjTrans.Transform(vDestPos, vParticleDest);
}
iQuery.m_From = vParticlePos;
iQuery.m_To = vParticleDest;
if( g_pLTClient->IntersectSegmentAgainst( iQuery, &iInfo, hMainWorld ) )
{
//handle bounce
if(pParticle->m_nUserData & PARTICLE_BOUNCE)
{
//move our particle to the position of the intersection, but offset based upon
//the normal slightly to avoid tunnelling
vDestPos = iInfo.m_Point + iInfo.m_Plane.m_Normal * 0.1f;
//and handle transforming back into object space if appropriate
if(m_pProps->m_bObjectSpace)
{
vDestPos = tInvObjTrans * vDestPos;
}
LTVector& vVel = pParticle->m_Velocity;
LTVector vNormal = iInfo.m_Plane.m_Normal;
if(m_pProps->m_bObjectSpace)
{
vNormal = tInvObjTrans.m_rRot.RotateVector(vNormal);
}
//reflect the velocity over the normal
vVel -= vNormal * (2.0f * vVel.Dot(vNormal));
//apply the coefficient of restitution
vVel *= fCOR;
}
//handle splat
if(pParticle->m_nUserData & PARTICLE_SPLAT)
{
//alright, we now need to create a splat effect
//create a random rotation around the plane that we hit
LTRotation rSplatRot(iInfo.m_Plane.m_Normal, LTVector(0.0f, 1.0f, 0.0f));
rSplatRot.Rotate(iInfo.m_Plane.m_Normal, GetRandom(0.0f, MATH_TWOPI));
LTRigidTransform tSplatTrans(iInfo.m_Point, rSplatRot);
//now handle if we hit an object, we need to convert spaces and set that as our parent
if(iInfo.m_hObject)
{
//convert the transform into a relative object space transform
LTRigidTransform tHitObjTrans;
g_pLTClient->GetObjectTransform(iInfo.m_hObject, &tHitObjTrans);
tSplatTrans = tHitObjTrans.GetInverse() * tSplatTrans;
}
//and create the actual new object
CLIENTFX_CREATESTRUCT CreateStruct("", 0, iInfo.m_hObject, tSplatTrans);
CreateNewFX(m_pFxMgr, m_pProps->m_pszSplatEffect, CreateStruct, true);
//we need to kill the particle
itParticles = RemoveParticle(itParticles);
continue;
}
}
}
//move the particle to the destination position that we calculated
pParticle->m_Pos = vDestPos;
//and update our extents box to match accordingly
vMin.Min(pParticle->m_Pos);
vMax.Max(pParticle->m_Pos);
if(m_pProps->m_bStreak)
{
LTVector vStreakPt = pParticle->m_Pos - pParticle->m_Velocity * m_pProps->m_fStreakScale;
vMin.Min(vStreakPt);
vMax.Max(vStreakPt);
}
//and move onto our next particle
itParticles.Prev();
}
}
//handle the case where we didn't hit any particles and therefore need to clear out our min and
//max (note we only check one component for speed)
if(vMin.x == kfInfinity)
{
vMin = tObjTrans.m_vPos;
vMax = tObjTrans.m_vPos;
}
//expand the bounding box out by the largest particle size times the square root of two
//to handle rotating particles that are at 45 degrees
float fExpandAmount = m_pProps->m_fMaxParticlePadding;
vMin -= LTVector(fExpandAmount, fExpandAmount, fExpandAmount);
vMax += LTVector(fExpandAmount, fExpandAmount, fExpandAmount);
//handle the case of when the particles are in object space, in such a case, we need to convert
//the AABB from object space to an AABB in world space
if(m_pProps->m_bObjectSpace)
{
//transform the object-space AABB to a world space AABB by projecting the dims onto the object basis vectors
LTVector vRight, vUp, vForward;
tObjTrans.m_rRot.GetVectors(vRight, vUp, vForward);
LTVector vObjHalfDims = (vMax - vMin) * 0.5f;
LTVector vWorldHalfDims;
vWorldHalfDims.x = vObjHalfDims.Dot(LTVector(fabsf(vRight.x), fabsf(vUp.x), fabsf(vForward.x)));
vWorldHalfDims.y = vObjHalfDims.Dot(LTVector(fabsf(vRight.y), fabsf(vUp.y), fabsf(vForward.y)));
vWorldHalfDims.z = vObjHalfDims.Dot(LTVector(fabsf(vRight.z), fabsf(vUp.z), fabsf(vForward.z)));
LTVector vObjCenter = (vMin + vMax) * 0.5f;
LTVector vWorldCenter;
tObjTrans.Transform(vObjCenter, vWorldCenter);
//save the transformed results
vMin = vWorldCenter - vWorldHalfDims;
vMax = vWorldCenter + vWorldHalfDims;
}
//update the visibility box of the object
g_pLTClient->GetCustomRender()->SetVisBoundingBox(m_hCustomRender, vMin - tObjTrans.m_vPos, vMax - tObjTrans.m_vPos);
//we also need to update the transform of our object to follow
g_pLTClient->SetObjectTransform(m_hCustomRender, tObjTrans);
}
void nGame::Process()
{
static float absoluteTime = 0.0f;
static float absoluteTime2 = 0.0f;
// Check for pause key
if(nGetInstance()->GetInput()->GetKeyboard()->GetNewKey(DIK_PAUSE) || nGetInstance()->GetInput()->GetKeyboard()->GetNewKey(DIK_P))
SetPause(!GetPause());
// Don't process further if paused
if(m_Pause)
return;
absoluteTime += nGetInstance()->GetElapsedTime();
absoluteTime2 += nGetInstance()->GetElapsedTime();
// Create enemy missle if enough time passed
if(absoluteTime > m_MissleTime)
{
// Reset the timer
absoluteTime = 0.0f;
if(m_MissleTime > 1.0f)
m_MissleTime -= (double)nGetInstance()->GetElapsedTime() / 4.0f;
// Create a missle at a random top position going to a random bottom position
AddMissle(nVector2(randf(0.0f,nGetInstance()->GetGraphics()->GetDisplaySize().cx),0.0f),nVector2(randf(0.0f,nGetInstance()->GetGraphics()->GetDisplaySize().cx),nGetInstance()->GetGraphics()->GetDisplaySize().cy),1.0f,80.0f,GAME_ENEMY_COLOR,false,true);
}
// Create child enemy missle if enough time passed
if(absoluteTime2 > 100.0f)
{
// Reset the timer
absoluteTime2 = 0.0f;
if(m_Missles.size())
{
// Create a missle at a random trail of a nother missle
unsigned long count = 1 + rand() % 3;
Missle* missle = &m_Missles[rand() % m_Missles.size()];
// Find a live enemy missle
while(missle->frendly || missle->dead > 0.0f)
missle = &m_Missles[rand() % m_Missles.size()];
nVector2 dir = missle->position - missle->source;
float length = dir.Length();
dir.Normalize();
nVector2 source = missle->source + dir * randf(0.0f,length);
for(unsigned long i = 0; i < count; i++)
AddMissle(source,nVector2(randf(0.0f,nGetInstance()->GetGraphics()->GetDisplaySize().cx),nGetInstance()->GetGraphics()->GetDisplaySize().cy),1.0f,80.0f,GAME_ENEMY_COLOR,false,true);
}
}
// Check left missle silo launch
if(nGetInstance()->GetInput()->GetMouse()->GetNewButton(nMouse::ButtonLeft))
FireSilo(m_Silos[0],nGetInstance()->GetInput()->GetMouse()->GetPosition(),20.0f,80.0f,true);
// Check right missle silo launch
if(nGetInstance()->GetInput()->GetMouse()->GetButton(nMouse::ButtonRight))
{
// Get a random vector in a sphere domain
nVector2 miss(randf(-1.0f,1.0f),randf(-1.0f,1.0f));
miss.Normalize();
miss *= randf(0.0f,50.0f);
FireSilo(m_Silos[1],nGetInstance()->GetInput()->GetMouse()->GetPosition() + miss,30.0f,20.0f,false);
}
// Remove silo fire time
for(unsigned long i = 0; i < m_Silos.size(); i++)
{
Silo* silo = &m_Silos[i];
// Remove some fire time
silo->time -= nGetInstance()->GetElapsedTime();
// Check if all/too much fire time was removed
if(silo->time < 0.0f)
silo->time = 0.0f;
}
// Move missles and remove dead ones
for(unsigned long i = 0; i < m_Missles.size(); i++)
{
Missle* missle = &m_Missles[i];
if(missle->position == missle->destination || missle->dead > 0.0f)
{
if(missle->position == missle->destination && !missle->frendly && missle->dead == 0.0f)
{
// Players base got hit
SetHealth(GetHealth() - 10);
// Check if player dead
if(!GetHealth())
{
// Game over
AddHiScore(m_Score);
RestartGame();
return;
}
}
if(missle->dead > 10.0f)
{
// Remove missle
RemoveMissle(i--);
continue;
}
if(missle->dead == 0.0f)
{
// Explode
AddExplosion(missle->position,missle->blast,4.0f,nColor(1.0f,0.1f,1.0f));
}
missle->dead += nGetInstance()->GetElapsedTime();
continue;
}
if(missle->target > 0.0f)
missle->target -= nGetInstance()->GetElapsedTime() / 10.0f;
else if(missle->target < 0.0f)
missle->target = 0.0f;
nVector2 velocity = missle->destination - missle->source;
velocity.Normalize();
velocity *= missle->speed * nGetInstance()->GetElapsedTime();
if(velocity.x > 0.0f && missle->position.x + velocity.x > missle->destination.x)
missle->position.x = missle->destination.x;
else if(velocity.x < 0.0f && missle->position.x + velocity.x < missle->destination.x)
missle->position.x = missle->destination.x;
else
missle->position.x += velocity.x;
if(velocity.y > 0.0f && missle->position.y + velocity.y > missle->destination.y)
missle->position.y = missle->destination.y;
else if(velocity.y < 0.0f && missle->position.y + velocity.y < missle->destination.y)
missle->position.y = missle->destination.y;
else
missle->position.y += velocity.y;
}
// Expand explosions and remove dead ones
for(unsigned long i = 0; i < m_Explosions.size(); i++)
{
Explosion* explosion = &m_Explosions[i];
if(explosion->size == explosion->power)
{
// Remove it
RemoveExplosion(i--);
continue;
}
float expansion = explosion->speed * nGetInstance()->GetElapsedTime();
if(explosion->size + expansion > explosion->power)
explosion->size = explosion->power;
else
explosion->size += expansion;
// Check if the explosion destroyed any missles
for(unsigned long j = 0; j < m_Missles.size(); j++)
{
Missle* missle = &m_Missles[j];
// Skip frendly or already dead missles
if(missle->frendly || missle->dead > 0.0f)
continue;
nVector2 dir = missle->position - explosion->position;
unsigned long points = 0;
if(dir.Length() < explosion->size)
{
// Set death time
missle->dead += nGetInstance()->GetElapsedTime();
// Create some particles
for(unsigned long k = 0; k < 50; k++)
{
// Get a random vector in a sphere domain
nVector2 velocity(randf(-1.0f,1.0f),randf(-1.0f,1.0f));
velocity.Normalize();
velocity *= randf(0.0f,5.0f);
AddParticle(missle->position,velocity,nVector2(0.0f,0.1f),10.0f,GAME_COLOR_PARTICLES);
}
// Add player points
points++;
}
// Add score
if(points > 1)
SetScore(GetScore() + points + points / 2);
else
SetScore(GetScore() + points);
}
}
// Move and remove particles
for(unsigned long i = 0; i < m_Particles.size(); i++)
{
Particle* particle = &m_Particles[i];
// Remove the particle if it's dead
if(particle->lived >= particle->life)
{
// Remove it
RemoveParticle(i--);
continue;
}
particle->lived += nGetInstance()->GetElapsedTime();
particle->velocity += particle->force * nGetInstance()->GetElapsedTime();
particle->position += particle->velocity * nGetInstance()->GetElapsedTime();
}
}
// updates all systems
void CParticleSystemManager::UpdateSystems( void )
{
CParticleSystem *pSystem = NULL;
signed int i = 0;
signed int iSystems = (signed)m_pParticleSystems.size();
// iterate through all the particle systems, drawing each
for (; i < iSystems; i++)
{
pSystem = m_pParticleSystems[i];
// remove the system if the system requests it
if( pSystem && pSystem->DrawSystem() == false)
{
delete pSystem;
m_pParticleSystems.erase((m_pParticleSystems.begin() + i));
i--;
iSystems--;
}
}
// we couldn't return earlier as we need to have the sorting before the ps updating
// however no sorting when we can't see the particles
if(CheckDrawSystem() == false)
return;
int iParticles = m_pParticles.size();
if(iParticles > 1) {
// calculate the fraction of a second between sorts
float flTimeSinceLastSort = (gEngfuncs.GetClientTime() - m_flLastSort);
// 1 / time between sorts will give us a number like 5
// if it is less than the particlesorts cvar then it is a small value
// and therefore a long time since last sort
if((((int)(1 / flTimeSinceLastSort)) < g_ParticleSorts->value)) {
m_flLastSort = gEngfuncs.GetClientTime();
std::sort(m_pParticles.begin(), m_pParticles.end(), less_than);
}
}
if(iParticles > 0) {
// prepare opengl
Particle_InitOpenGL();
float flTimeSinceLastDraw = TimeSinceLastDraw();
// loop through all particles drawing them
// they have already been tested and updated in their pss' draw sys func
// we've reversed the greater than order, so that oldest particles are at 0
// further away particles and recently added particles get drawn first
CParticle *pParticle = NULL;
for(i = 0; i < iParticles ; i++)
{
if(m_pParticles[i]) {
pParticle = m_pParticles[i];
if(pParticle && pParticle->Test()) {
pParticle->Update(flTimeSinceLastDraw);
if(g_iUser1 != OBS_MAP_FREE && g_iUser1 != OBS_MAP_CHASE) {
// unfortunately we have to prepare every particle now
// as we can't prepare for a batch of the same type anymore
pParticle->Prepare();
pParticle->Draw();
}
} else {
RemoveParticle(pParticle);
i--;
iParticles--;
}
}
}
Particle_FinishOpenGL();
}
// print out how fast we've been drawing the systems in debug mode
if (g_ParticleDebug->value != 0 && ((m_flLastSort + 0.5) <= gEngfuncs.GetClientTime()))
{
gEngfuncs.Con_Printf("%i Particles Drawn this pass in %i systems ", m_pParticles.size(), m_pParticleSystems.size());
gEngfuncs.Con_Printf("%i Textures in Cache\n\0", m_pTextures.size());
}
m_flLastDraw = gEngfuncs.GetClientTime();
}
