void C_ParticleSmokeGrenade::UpdateSmokeTrail( float fTimeDelta )
{
C_BaseEntity *pAimEnt = GetFollowedEntity();
if ( pAimEnt )
{
Vector forward, right, up;
// Update the smoke particle color.
if(m_CurrentStage == 0)
{
m_SmokeTrail.m_StartColor = EngineGetLightForPoint(GetAbsOrigin()) * 0.5f;
m_SmokeTrail.m_EndColor = m_SmokeTrail.m_StartColor;
}
// Spin the smoke trail.
AngleVectors(pAimEnt->GetAbsAngles(), &forward, &right, &up);
m_SmokeTrail.m_VelocityOffset = forward * 30 + GetAbsVelocity();
m_SmokeTrail.SetLocalOrigin( GetAbsOrigin() );
m_SmokeTrail.Update(fTimeDelta);
}
}
void C_FuncSmokeVolume::FillVolume()
{
Vector vPos;
for(int x=0; x < m_xCount; x++)
{
for(int y=0; y < m_yCount; y++)
{
for(int z=0; z < m_zCount; z++)
{
vPos = GetSmokeParticlePos( x, y, z );
if(SmokeParticleInfo *pInfo = GetSmokeParticleInfo(x,y,z))
{
int contents = GetWorldPointContents(vPos);
if(contents & CONTENTS_SOLID)
{
pInfo->m_pParticle = NULL;
}
else
{
SmokeGrenadeParticle *pParticle =
(SmokeGrenadeParticle*)m_ParticleEffect.AddParticle(sizeof(SmokeGrenadeParticle), m_MaterialHandle);
if(pParticle)
{
pParticle->m_Pos = vPos;
pParticle->m_ColorInterp = (unsigned char)((rand() * 255) / RAND_MAX);
pParticle->m_RotationFactor = FRand( -1.0f, 1.0f ); // Rotation factor.
pParticle->m_CurRotation = FRand( -m_RotationSpeed, m_RotationSpeed );
}
#ifdef _DEBUG
int testX, testY, testZ;
int index = GetSmokeParticleIndex(x,y,z);
GetParticleInfoXYZ(index, testX, testY, testZ);
assert(testX == x && testY == y && testZ == z);
#endif
Vector vColor = EngineGetLightForPoint(vPos);
pInfo->m_Color[0] = LinearToTexture( vColor.x );
pInfo->m_Color[1] = LinearToTexture( vColor.y );
pInfo->m_Color[2] = LinearToTexture( vColor.z );
// Cast some rays and if it's too close to anything, fade its alpha down.
pInfo->m_FadeAlpha = 1;
for(int i=0; i < NUM_FADE_PLANES; i++)
{
trace_t trace;
WorldTraceLine(vPos, vPos + s_FadePlaneDirections[i] * 100, MASK_SOLID_BRUSHONLY, &trace);
if(trace.fraction < 1.0f)
{
float dist = DotProduct(trace.plane.normal, vPos) - trace.plane.dist;
if(dist < 0)
{
pInfo->m_FadeAlpha = 0;
}
else if(dist < m_ParticleRadius)
{
float alphaScale = dist / m_ParticleRadius;
alphaScale *= alphaScale * alphaScale;
pInfo->m_FadeAlpha *= alphaScale;
}
}
}
pInfo->m_pParticle = pParticle;
pInfo->m_TradeIndex = -1;
}
}
}
}
}
}
void C_ParticleSmokeGrenade::FillVolume()
{
m_CurrentStage = 1;
m_SmokeBasePos = GetPos();
m_SmokeTrail.SetEmit(false);
m_ExpandTimeCounter = m_ExpandRadius = 0;
m_bVolumeFilled = true;
// Spawn all of our particles.
float overlap = SMOKEPARTICLE_OVERLAP;
m_SpacingRadius = (SMOKEGRENADE_PARTICLERADIUS - overlap) * NUM_PARTICLES_PER_DIMENSION * 0.5f;
m_xCount = m_yCount = m_zCount = NUM_PARTICLES_PER_DIMENSION;
float invNumPerDimX = 1.0f / (m_xCount-1);
float invNumPerDimY = 1.0f / (m_yCount-1);
float invNumPerDimZ = 1.0f / (m_zCount-1);
Vector vPos;
for(int x=0; x < m_xCount; x++)
{
vPos.x = m_SmokeBasePos.x + ((float)x * invNumPerDimX) * m_SpacingRadius * 2 - m_SpacingRadius;
for(int y=0; y < m_yCount; y++)
{
vPos.y = m_SmokeBasePos.y + ((float)y * invNumPerDimY) * m_SpacingRadius * 2 - m_SpacingRadius;
for(int z=0; z < m_zCount; z++)
{
vPos.z = m_SmokeBasePos.z + ((float)z * invNumPerDimZ) * m_SpacingRadius * 2 - m_SpacingRadius;
// Don't spawn and simulate particles that are inside a wall
int contents = enginetrace->GetPointContents( vPos );
if( contents & CONTENTS_SOLID )
{
continue;
}
if(SmokeParticleInfo *pInfo = GetSmokeParticleInfo(x,y,z))
{
// MD 11/10/03: disabled this because we weren't getting coverage near the ground.
// If we want it back in certain cases, we can make it a flag.
/*int contents = GetWorldPointContents(vPos);
if(false && (contents & CONTENTS_SOLID))
{
pInfo->m_pParticle = NULL;
}
else
*/
{
SmokeGrenadeParticle *pParticle =
(SmokeGrenadeParticle*)m_ParticleEffect.AddParticle(sizeof(SmokeGrenadeParticle), m_MaterialHandles[rand() % NUM_MATERIAL_HANDLES]);
if(pParticle)
{
pParticle->m_Pos = vPos - m_SmokeBasePos; // store its position in local space
pParticle->m_ColorInterp = (unsigned char)((rand() * 255) / RAND_MAX);
pParticle->m_RotationSpeed = FRand(-ROTATION_SPEED, ROTATION_SPEED); // Rotation speed.
pParticle->m_CurRotation = FRand(-6, 6);
}
#ifdef _DEBUG
int testX, testY, testZ;
int index = GetSmokeParticleIndex(x,y,z);
GetParticleInfoXYZ(index, testX, testY, testZ);
assert(testX == x && testY == y && testZ == z);
#endif
Vector vColor = EngineGetLightForPoint(vPos);
pInfo->m_Color[0] = (unsigned char)(vColor.x * 255.9f);
pInfo->m_Color[1] = (unsigned char)(vColor.y * 255.9f);
pInfo->m_Color[2] = (unsigned char)(vColor.z * 255.9f);
// Cast some rays and if it's too close to anything, fade its alpha down.
pInfo->m_FadeAlpha = 1;
/*for(int i=0; i < NUM_FADE_PLANES; i++)
{
trace_t trace;
WorldTraceLine(vPos, vPos + s_FadePlaneDirections[i] * 100, MASK_SOLID_BRUSHONLY, &trace);
if(trace.fraction < 1.0f)
{
float dist = DotProduct(trace.plane.normal, vPos) - trace.plane.dist;
if(dist < 0)
{
pInfo->m_FadeAlpha = 0;
}
else if(dist < SMOKEPARTICLE_SIZE)
{
float alphaScale = dist / SMOKEPARTICLE_SIZE;
alphaScale *= alphaScale * alphaScale;
pInfo->m_FadeAlpha *= alphaScale;
}
}
}*/
pInfo->m_pParticle = pParticle;
pInfo->m_TradeIndex = -1;
}
}
}
}
}
}
void C_ParticleSmokeGrenade::Update(float fTimeDelta)
{
m_LifetimeCounter += fTimeDelta;
// Update the smoke trail.
C_BaseEntity *pAimEnt = GetFollowedEntity();
if ( pAimEnt )
{
Vector forward, right, up;
// Update the smoke particle color.
if(m_CurrentStage == 0)
{
m_SmokeTrail.m_StartColor = EngineGetLightForPoint(GetAbsOrigin()) * 0.5f;
m_SmokeTrail.m_EndColor = m_SmokeTrail.m_StartColor;
}
// Spin the smoke trail.
AngleVectors(pAimEnt->GetAbsAngles(), &forward, &right, &up);
m_SmokeTrail.m_VelocityOffset = forward * 30 + GetAbsVelocity();
m_SmokeTrail.SetLocalOrigin( GetAbsOrigin() );
m_SmokeTrail.Update(fTimeDelta);
}
// Update our fade alpha.
if(m_LifetimeCounter < m_FadeStartTime)
{
m_FadeAlpha = 1;
}
else if(m_LifetimeCounter < m_FadeEndTime)
{
float fadePercent = (m_LifetimeCounter - m_FadeStartTime) / (m_FadeEndTime - m_FadeStartTime);
m_FadeAlpha = cos(fadePercent * 3.14159) * 0.5 + 0.5;
}
else
{
m_FadeAlpha = 0;
}
// Scale by the amount the sphere has grown.
m_FadeAlpha *= m_ExpandRadius / SMOKESPHERE_MAX_RADIUS;
if(m_CurrentStage == 1)
{
// Update the expanding sphere.
m_ExpandTimeCounter += fTimeDelta;
if(m_ExpandTimeCounter > SMOKESPHERE_EXPAND_TIME)
m_ExpandTimeCounter = SMOKESPHERE_EXPAND_TIME;
m_ExpandRadius = SMOKESPHERE_MAX_RADIUS * (float)sin(m_ExpandTimeCounter * 3.14159265358 * 0.5 / SMOKESPHERE_EXPAND_TIME);
// Add our influence to the global smoke fog alpha.
float testDist = (EngineGetVecRenderOrigin() - m_SmokeBasePos).Length();
float fadeEnd = m_ExpandRadius * 0.75;
if(testDist < fadeEnd)
{
EngineGetSmokeFogOverlayAlpha() += 1 - testDist / fadeEnd;
}
// This is used to randomize the direction it chooses to move a particle in.
int offsetLookup[3] = {-1,0,1};
// Update all the moving traders and establish new ones.
int nTotal = m_xCount * m_yCount * m_zCount;
for(int i=0; i < nTotal; i++)
{
SmokeParticleInfo *pInfo = &m_SmokeParticleInfos[i];
if(!pInfo->m_pParticle)
continue;
if(pInfo->m_TradeIndex == -1)
{
pInfo->m_pParticle->m_FadeAlpha = pInfo->m_FadeAlpha;
pInfo->m_pParticle->m_Color[0] = pInfo->m_Color[0];
pInfo->m_pParticle->m_Color[1] = pInfo->m_Color[1];
pInfo->m_pParticle->m_Color[2] = pInfo->m_Color[2];
// Is there an adjacent one that's not trading?
int x, y, z;
GetParticleInfoXYZ(i, x, y, z);
int xCountOffset = rand();
int yCountOffset = rand();
int zCountOffset = rand();
bool bFound = false;
for(int xCount=0; xCount < 3 && !bFound; xCount++)
{
for(int yCount=0; yCount < 3 && !bFound; yCount++)
{
for(int zCount=0; zCount < 3; zCount++)
{
int testX = x + offsetLookup[(xCount+xCountOffset) % 3];
int testY = y + offsetLookup[(yCount+yCountOffset) % 3];
int testZ = z + offsetLookup[(zCount+zCountOffset) % 3];
if(testX == x && testY == y && testZ == z)
continue;
if(IsValidXYZCoords(testX, testY, testZ))
{
SmokeParticleInfo *pOther = GetSmokeParticleInfo(testX, testY, testZ);
if(pOther->m_pParticle && pOther->m_TradeIndex == -1)
{
// Ok, this one is looking to trade also.
pInfo->m_TradeIndex = GetSmokeParticleIndex(testX, testY, testZ);
pOther->m_TradeIndex = i;
pInfo->m_TradeClock = pOther->m_TradeClock = 0;
pInfo->m_TradeDuration = FRand(TRADE_DURATION_MIN, TRADE_DURATION_MAX);
bFound = true;
break;
}
}
}
}
}
}
else
{
SmokeParticleInfo *pOther = &m_SmokeParticleInfos[pInfo->m_TradeIndex];
assert(pOther->m_TradeIndex == i);
// This makes sure the trade only gets updated once per frame.
if(pInfo < pOther)
{
// Increment the trade clock..
pInfo->m_TradeClock = (pOther->m_TradeClock += fTimeDelta);
int x, y, z;
GetParticleInfoXYZ(i, x, y, z);
Vector myPos = GetSmokeParticlePos(x, y, z);
int otherX, otherY, otherZ;
GetParticleInfoXYZ(pInfo->m_TradeIndex, otherX, otherY, otherZ);
Vector otherPos = GetSmokeParticlePos(otherX, otherY, otherZ);
// Is the trade finished?
if(pInfo->m_TradeClock >= pInfo->m_TradeDuration)
{
pInfo->m_TradeIndex = pOther->m_TradeIndex = -1;
pInfo->m_pParticle->m_Pos = otherPos;
pOther->m_pParticle->m_Pos = myPos;
SmokeGrenadeParticle *temp = pInfo->m_pParticle;
pInfo->m_pParticle = pOther->m_pParticle;
pOther->m_pParticle = temp;
}
else
{
// Ok, move them closer.
float percent = (float)cos(pInfo->m_TradeClock * 2 * 1.57079632f / pInfo->m_TradeDuration);
percent = percent * 0.5 + 0.5;
pInfo->m_pParticle->m_FadeAlpha = pInfo->m_FadeAlpha + (pOther->m_FadeAlpha - pInfo->m_FadeAlpha) * (1 - percent);
pOther->m_pParticle->m_FadeAlpha = pInfo->m_FadeAlpha + (pOther->m_FadeAlpha - pInfo->m_FadeAlpha) * percent;
InterpColor(pInfo->m_pParticle->m_Color, pInfo->m_Color, pOther->m_Color, 1-percent);
InterpColor(pOther->m_pParticle->m_Color, pInfo->m_Color, pOther->m_Color, percent);
pInfo->m_pParticle->m_Pos = myPos + (otherPos - myPos) * (1 - percent);
pOther->m_pParticle->m_Pos = myPos + (otherPos - myPos) * percent;
}
}
}
}
}
}
