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gPET_kernals.cu
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gPET_kernals.cu
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#ifndef __GPETKERNAL__
#define __GPETKERNAL__
#include "gPET.h"
#include "gPET_kernals.h"
__global__ void setupcuseed(int* iseed1)
//Setup random seeds, used for random sampling in GPU code
{
int id = blockIdx.x*blockDim.x + threadIdx.x;
// obtain current id on thread
if( id < NRAND)
{
curand_init(iseed1[id], id, 0, &cuseed[id]);
if(id<5) printf("first 5 cuseeds are %u \n",cuseed[id]);
}
}
__device__ int4 getAbsVox(float3 xtemp)
//Return the absolute vox index according to the coordinate
{
int4 temp;
temp.z = (xtemp.z-Offsetz_gBrachy)*idz_gBrachy;
temp.y = (xtemp.y-Offsety_gBrachy)*idy_gBrachy;
temp.x = (xtemp.x-Offsetx_gBrachy)*idx_gBrachy;
//The following give the boundry condition
temp.w = (temp.x <= 0.0f || temp.x >= Unxvox || temp.y <= 0.0f || temp.y >= Unyvox || temp.z <= 0.0f || temp.z >= Unzvox)?-1 : 1;
return temp;
}
__device__ float lamwck(float e)
//Minimum Mean free path prepared to play the Woodcock trick for materials in phantom
{
float i = idlewk*(e-wcke0) + 0.5f;
return tex1D(woock_tex, i);
}
__device__ float lamwckde(float e)
//Minimum Mean free path prepared to play the Woodcock trick for materials in detector
{
float i = idlewk*(e-wcke0) + 0.5f;
return tex1D(woockde_tex, i);
}
__device__ float itphip_G(int matid, float e)
//Photon total inverse mean free path
{
float i = idleph*(e-elaph0) + 0.5;
return tex1D(lamph_tex,matid * NLAPH + i);
}
__device__ float irylip(int matid, float e)
//Inverse Rayleigh mean free path
{
float i = idlerl*(e - erayl0) + 0.5;
return tex1D(rayle_tex,matid * NRAYL + i);
}
__device__ float icptip(int matid, float e)
//Inverse Compton mean free path
{
float i = idlecp*(e - ecmpt0) + 0.5;
return tex1D(compt_tex,matid * NCMPT + i);
}
__device__ void comsam(float energytemp, curandState *localState_pt, float *efrac, float *costhe, int matid)
//this is the KN model crosssection from table
/*******************************************************************
c* Samples a Compton event following Klein-Nishina DCS *
c* *
c* Input: *
c* energy -> photon energy in eV *
c* Output: *
c* efrac -> fraction of initial energy kept by 2nd photon *
c* costhe -> cos(theta) of the 2nd photon *
c* Comments: *
c* -> inirng() must be called before 1st call *
c******************************************************************/
{
float indcp = curand_uniform(localState_pt)*idcpcm;
float inde = energytemp*idecm;
float temp = tex3D(s_tex,inde+0.5f, indcp+0.5f, matid+0.5f);
if(temp > 1.0f) temp = 1.0f;
if(temp < -1.0f) temp = -1.0f;
*costhe = temp;
*efrac = 1.0f/(1.0f + energytemp*IMC2*(1.0f-temp));
}
__device__ void comsam(float energytemp, curandState *localState_pt, float *efrac, float *costhe)
//this is the standard KN model which treats electron as free and no dopler effect
/*******************************************************************
c* Samples a Compton event following Klein-Nishina DCS *
c* *
c* Input: *
c* energy -> photon energy in eV *
c* Output: *
c* efrac -> fraction of initial energy kept by 2nd photon *
c* costhe -> cos(theta) of the 2nd photon *
c* Comments: *
c* -> inirng() must be called before 1st call *
c******************************************************************/
{
float e0,twoe,kmin2,loge,mess;
e0 = energytemp*IMC2;
twoe = 2.0*e0;
kmin2 = 1.0/((1.0+twoe)*(1.0+twoe));
loge = __logf(1.0+twoe);
for(;;)
{
if (curand_uniform(localState_pt)*(loge+twoe*(1.0+e0)*kmin2) < loge)
{
*efrac = expf(-curand_uniform(localState_pt)*loge);
}
else
{
*efrac = sqrtf(kmin2+curand_uniform(localState_pt)*(1.0-kmin2));
}
mess = e0*e0*(*efrac)*(1.0+(*efrac)*(*efrac));
if (curand_uniform(localState_pt)*mess <= mess-(1.0-*efrac)*((1.0+twoe)*(*efrac)-1.0))break;
}
*costhe = 1.0-(1.0-*efrac)/((*efrac)*e0);
}
__device__ void rylsam(float energytemp, int matid, curandState *localState_pt, float *costhe)
/*******************************************************************
c* Samples a Rayleigh event following its DCS *
c* *
c* Input: *
c* energy -> photon energy in eV *
c* Output: *
c* costhe -> cos(theta) of the 2nd photon *
c* Comments: *
c* -> inirng() must be called before 1st call *
c******************************************************************/
{
float indcp = curand_uniform(localState_pt)*idcprl;
float inde = energytemp*iderl;
float temp = tex3D(f_tex,inde+0.5f, indcp+0.5f, matid+0.5f);
if(temp > 1.0f) temp = 1.0f;
if(temp < -1.0f) temp = -1.0f;
*costhe = temp;
}
__device__ float getDistance(float3 coords, float4 direcs)
//special case for sphere, need modification dor other cases
/*******************************************************************
c* get the distance to the recording plane *
c* distance-> nearest distance to current body boundaries *
c******************************************************************/
{
coords.x=coords.x-recordsphere_d[0];
coords.y=coords.y-recordsphere_d[1];
coords.z=coords.z-recordsphere_d[2];
float t;
float a= direcs.x * direcs.x + direcs.y * direcs.y + direcs.z * direcs.z;
float b = 2.0f*(direcs.x * coords.x + direcs.y * coords.y + direcs.z * coords.z);
float c = (coords.x * coords.x + coords.y * coords.y + coords.z * coords.z)-(recordsphere_d[3])*(recordsphere_d[3]);
if(b*b-4*a*c<0) return 0;
if(c<0)
t=(-b+sqrtf(b*b-4*a*c))/(2*a);
else if(b<0)
t=(-b-sqrtf(b*b-4*a*c))/(2*a);
else
t=(-b+sqrtf(b*b-4*a*c))/(2*a);
return t;//direction normalized
}
__device__ void rotate(float *u, float *v, float *w, float costh, float phi)
/*******************************************************************
c* Rotates a vector; the rotation is specified by giving *
c* the polar and azimuthal angles in the "self-frame", as *
c* determined by the vector to be rotated. *
c* *
c* Input: *
c* (u,v,w) -> input vector (=d) in the lab. frame *
c* costh -> cos(theta), angle between d before and after turn *
c* phi -> azimuthal angle (rad) turned by d in its self-frame *
c* Output: *
c* (u,v,w) -> rotated vector components in the lab. frame *
c* Comments: *
c* -> (u,v,w) should have norm=1 on input; if not, it is *
c* renormalized on output, provided norm>0. *
c* -> The algorithm is based on considering the turned vector *
c* d' expressed in the self-frame S', *
c* d' = (sin(th)cos(ph), sin(th)sin(ph), cos(th)) *
c* and then apply a change of frame from S' to the lab *
c* frame. S' is defined as having its z' axis coincident *
c* with d, its y' axis perpendicular to z and z' and its *
c* x' axis equal to y'*z'. The matrix of the change is then*
c* / uv/rho -v/rho u \ *
c* S ->lab: | vw/rho u/rho v | , rho=(u^2+v^2)^0.5*
c* \ -rho 0 w / *
c* -> When rho=0 (w=1 or -1) z and z' are parallel and the y' *
c* axis cannot be defined in this way. Instead y' is set to*
c* y and therefore either x'=x (if w=1) or x'=-x (w=-1) *
c******************************************************************/
{
float rho2,sinphi,cosphi,sthrho,urho,vrho,sinth,norm;
rho2 = (*u)*(*u)+(*v)*(*v);
norm = rho2 + (*w)*(*w);
// Check normalization:
if (fabs(norm-1.0) > SZERO)
{
// Renormalize:
norm = 1.0/__fsqrt_rn(norm);
*u = (*u)*norm;
*v = (*v)*norm;
*w = (*w)*norm;
}
sinphi = __sinf(phi);
cosphi = __cosf(phi);
// Case z' not= z:
float temp = costh*costh;
if (rho2 > ZERO)
{
if(temp < 1.0f)
sthrho = __fsqrt_rn((1.00-temp)/rho2);
else
sthrho = 0.0f;
urho = (*u)*sthrho;
vrho = (*v)*sthrho;
*u = (*u)*costh - vrho*sinphi + (*w)*urho*cosphi;
*v = (*v)*costh + urho*sinphi + (*w)*vrho*cosphi;
*w = (*w)*costh - rho2*sthrho*cosphi;
}
else
// 2 especial cases when z'=z or z'=-z:
{
if(temp < 1.0f)
sinth = __fsqrt_rn(1.00-temp);
else
sinth = 0.0f;
*v = sinth*sinphi;
if (*w > 0.0)
{
*u = sinth*cosphi;
*w = costh;
}
else
{
*u = -sinth*cosphi;
*w = -costh;
}
}
}
__global__ void photon(const int nactive)
/*******************************************************************
c* Transports a photon until it either escapes from the *
c* phantom or its energy drops below EabsPhoton *
c******************************************************************/
{
int id = blockIdx.x*blockDim.x + threadIdx.x;
// obtain current id on thread
const double spe=29979.2458; //cm/us
curandState localState = cuseed[id%NRAND];
while( id < nactive)
{
float3 xtemp = x_gBrachy[id];
float4 vxtemp = vx_gBrachy[id];
double tof = d_time[id];
//if(id <5 ) printf("x=%f,y=%f,z=%f,t = %f, vx=%f,vy=%f,vz=%f,e=%f\n",xtemp.x,xtemp.y,xtemp.z,tof,vxtemp.x,vxtemp.y,vxtemp.z,vxtemp.w);
if(vxtemp.w<0||tof<=0) {id+=blockDim.x*gridDim.x;continue;}
// Loop until it either escapes or is absorbed:
while(1)
{
// Get lambda from the minimum lambda at the current energy:
float lammin = lamwck(vxtemp.w);
float s = -lammin*__logf(curand_uniform(&localState));
xtemp.x += s*vxtemp.x;
xtemp.y += s*vxtemp.y;
xtemp.z += s*vxtemp.z;
//xtemp.w += s/spe;
tof += s/spe;
int4 absvoxtemp = getAbsVox(xtemp);
//if(id <5 ) printf("id %d absvoxtem.w=%d, x=%f,y=%f,z=%f,vx=%f,vy=%f,vz=%f,s=%f\n",id, absvoxtemp.w, xtemp.x,xtemp.y,xtemp.z,vxtemp.x,vxtemp.y,vxtemp.z,s);
if (absvoxtemp.w == -1)//means the particle is outside the phantom
{
#if RECORDPSF==-1
float r=getDistance(xtemp,vxtemp);
xtemp.x +=r*vxtemp.x;
xtemp.y +=r*vxtemp.y;
xtemp.z +=r*vxtemp.z;
tof += r/spe;
#endif
break;
}
// get density
float voxden = tex3D(dens_tex, absvoxtemp.x, absvoxtemp.y, absvoxtemp.z);
// get mat id
int voxmatid = tex3D(mat_tex, absvoxtemp.x, absvoxtemp.y, absvoxtemp.z);
// Apply Woodcock trick:
float lamden = lammin*voxden;
float prob = 1.0-lamden*itphip_G(voxmatid, vxtemp.w);
float randno = curand_uniform(&localState);
// No real event; continue jumping:
if (randno < prob) continue;
// Compton:
prob += lamden*icptip(voxmatid, vxtemp.w);
if (randno < prob)
{
float efrac, costhe;
comsam(vxtemp.w, &localState, &efrac, &costhe, voxmatid);
// comsam(vxtemp.w, &localState, &efrac, &costhe);
float phi = TWOPI*curand_uniform(&localState);
vxtemp.w *= efrac;
if (vxtemp.w < eabsph)
break;
rotate(&vxtemp.x,&vxtemp.y,&vxtemp.z,costhe,phi);
continue;
}
// Rayleigh:
prob += lamden*irylip(voxmatid, vxtemp.w);
if (randno < prob)
{
float costhe;
rylsam(vxtemp.w, voxmatid, &localState, &costhe);
float phi = TWOPI*curand_uniform(&localState);
rotate(&vxtemp.x,&vxtemp.y,&vxtemp.z,costhe,phi);
continue;
}
// Photoelectric:
tof = -0.5f;// t<0 means dead in phantom, won't be simulated any more
break;
}
x_gBrachy[id] = xtemp;
d_time[id] = tof;
vx_gBrachy[id] = vxtemp;
id+=blockDim.x*gridDim.x;
}
cuseed[id%NRAND] = localState;
}
__device__ float3 setPositronRange(float3 xtemp, float4 vxtemp, curandState* plocalState, int usedirection)
/*******************************************************************
c* Finds positron range according to its energy *
c* *
c* Input: *
c* xtemp -> current position, vxtemp -> vx vy vz energy, *
c* usedirection -> 0 sample positron direction or 1 predefined *
c* Output: *
c* position + range *
c******************************************************************/
{
int id = blockDim.x*blockIdx.x+threadIdx.x;
float3 distance;
float ekin = vxtemp.w/1e6; //transfer to MeV
//float Zeff = 7.2222; //1/9*1+8/9*8;
//float Aeff = 13; //Zeff/(1/9*1/1+8/9*8/16)
float b1 = 5.44040782;//4.569*Aeff/powf(Zeff,1.209);
float b2 = 0.369516529; // 1/(2.873-0.02309*Zeff);
float Rex = 0.1*b1*ekin*ekin/(b2+ekin);
float sigma = Rex/(2*1.0f); //put material density here
distance.x = sigma*curand_normal(plocalState);
distance.y = sigma*curand_normal(plocalState);
distance.z = sigma*curand_normal(plocalState);
float r=sqrtf(distance.x*distance.x+distance.y*distance.y+distance.z*distance.z);
if(usedirection)
{
float tmp = sqrtf(vxtemp.x*vxtemp.x+vxtemp.y*vxtemp.y+vxtemp.z*vxtemp.z);
distance.x = r*vxtemp.x/tmp;//reassign direction
distance.y = r*vxtemp.y/tmp;
distance.z = r*vxtemp.z/tmp;
}
float s = 0, step =100;
int4 absvoxtemp = getAbsVox(xtemp);
while(s<r)
{
step = 1000;
if(absvoxtemp.w>0)
{
b1 = (Offsetx_gBrachy+(absvoxtemp.x+(distance.x>0))*dx_gBrachy-xtemp.x)/distance.x;//remaining voxel length along x direction
if(step > b1) {step = b1;absvoxtemp.w=1;}
b1 = (Offsety_gBrachy+(absvoxtemp.y+(distance.y>0))*dy_gBrachy-xtemp.y)/distance.y;
if(step > b1) {step = b1;absvoxtemp.w=2;}
b1 = (Offsetz_gBrachy+(absvoxtemp.z+(distance.z>0))*dz_gBrachy-xtemp.z)/distance.z;
if(step > b1) {step = b1;absvoxtemp.w=3;}
if(absvoxtemp.w == 1) absvoxtemp.x += (distance.x>0)?1:-1;
else if(absvoxtemp.w == 2) absvoxtemp.y += (distance.y>0)?1:-1;
else absvoxtemp.z += (distance.z>0)?1:-1;
b2 = tex3D(dens_tex, absvoxtemp.x, absvoxtemp.y, absvoxtemp.z);
step = step*r;
s += step*b2;
if(s > r) step += (r-s)/b2;
}
else
{
step += (r-s)/0.0012905;
s = r + 100;//make s > r
}
xtemp.x += step*distance.x/r;
xtemp.y += step*distance.y/r;
xtemp.z += step*distance.z/r;
if(xtemp.x < Offsetx_gBrachy || xtemp.x > (Offsetx_gBrachy+Unxvox*dx_gBrachy)) absvoxtemp.w = -1;
if(xtemp.y < Offsety_gBrachy || xtemp.y > (Offsety_gBrachy+Unyvox*dy_gBrachy)) absvoxtemp.w = -1;
if(xtemp.z < Offsetz_gBrachy || xtemp.z > (Offsetz_gBrachy+Unzvox*dz_gBrachy)) absvoxtemp.w = -1;
}
return xtemp;
}
__device__ float sampleEkPositron(int type, float* d_coef,curandState* plocalState)
/*******************************************************************
c* Finds positron energy according to fitted parameters *
c* *
c* Input: *
c* type -> source type, d_coef -> fitted coefficients *
c* Output: *
c* kinetic energy in eV *
c* Comments: *
c* coefficients can be fitted from calculated spectrum *
c* refer to Levin et al PMB 44, 781-799 *
c******************************************************************/
{
float u=100, E=0, sumE=0;
while(u> sumE)
{
E=curand_uniform(plocalState)*(d_coef[8*type]-0.511)+0.511;
u=d_coef[8*type+1]*curand_uniform(plocalState);
sumE=0;
for(int i=0;i<6;i++)
sumE+=d_coef[8*type+2+i]*powf(E,5-i);
}
return (E-0.511)*1e6;//consistent in unit eV
}
__device__ float3 getPositionFromShape(int index, int shapeindex, float* shapecoeff, curandState* plocalState)
/*******************************************************************
c* Sample position uniformly inside a volume *
c* *
c* Input: *
c* type -> source type, shapeindex -> shape type *
c* Output: *
c* position *
c******************************************************************/
{
float3 position;
//int id = blockDim.x*blockIdx.x+threadIdx.x;
if(shapeindex<0 || shapeindex>2) shapeindex=0;
if(shapeindex==0)//box
{
position.x=shapecoeff[6*index]+shapecoeff[6*index+3]*(-1+2*curand_uniform(plocalState))*0.5;
position.y=shapecoeff[6*index+1]+shapecoeff[6*index+4]*(-1+2*curand_uniform(plocalState))*0.5;
position.z=shapecoeff[6*index+2]+shapecoeff[6*index+5]*(-1+2*curand_uniform(plocalState))*0.5;
}
else if(shapeindex==1)//cylinder
{
float phi=TWOPI*curand_uniform(plocalState);
float r= shapecoeff[6*index+3]*sqrtf(curand_uniform(plocalState));
position.x=shapecoeff[6*index]+r*cosf(phi);
position.y=shapecoeff[6*index+1]+r*sinf(phi);
position.z=shapecoeff[6*index+2]+shapecoeff[6*index+4]*(-1+2*curand_uniform(plocalState))*0.5;
}
else if(shapeindex==2)//sphere
{
float phi=TWOPI*curand_uniform(plocalState);
float costheta=-1+2*curand_uniform(plocalState);
float r= shapecoeff[6*index+3]*cbrtf(curand_uniform(plocalState));
position.x=shapecoeff[6*index]+r*sqrtf(1-costheta*costheta)*cosf(phi);
position.y=shapecoeff[6*index+1]+r*sqrtf(1-costheta*costheta)*sinf(phi);
position.z=shapecoeff[6*index+2]+r*costheta;
}
return position;
}
__global__ void setPosition(int nsource, unsigned int totalatom, float tref, float t, unsigned int* d_natom, unsigned int* d_sumpartial, int* d_type, int* d_shape,
float* d_shapecoeff, float* d_halftime, float* d_decayRatio, float* d_coef, int useprange)
/*******************************************************************
c* Sample photon information from a positron source *
c* for a given time period *
c******************************************************************/
{
int id=blockIdx.x*blockDim.x + threadIdx.x;
curandState localState = cuseed[id%NRAND];
int sourceindex=0, istart, iend, imid;
float randno, phi;
double ptime=0, tmp=0;
float3 xtemp;
float4 vxtemp;
while(id<totalatom)
{
#if BISEARCH == 0
for(sourceindex=0;sourceindex<nsource;sourceindex++)
{
if(id<d_sumpartial[sourceindex]) break;
}
#else
if(id < d_sumpartial[0]) sourceindex = 0;
else
{
istart = 0;
iend = nsource-1;
while(iend - istart >1)
{
imid = (iend+istart)/2;
if(id<d_sumpartial[imid]) iend = imid;
else istart = imid;
}
sourceindex = iend;
}
#endif
tmp = double(-d_halftime[d_type[sourceindex]]*1.442695);
ptime = tmp*log(curand_uniform_double(&localState));
if(ptime<t)
{
atomicSub(&(d_natom[sourceindex]),1);
randno=curand_uniform(&localState);
if(randno < d_decayRatio[d_type[sourceindex]])
{
int ind = atomicAdd(&d_curemitted,1);
xtemp = getPositionFromShape(sourceindex,d_shape[sourceindex],d_shapecoeff, &localState);
if(useprange == 1)
{
vxtemp.w = sampleEkPositron(d_type[sourceindex], d_coef, &localState);
xtemp = setPositronRange(xtemp, vxtemp,&localState,0);
}
randno=-1+2*curand_uniform(&localState);
phi = TWOPI*curand_uniform(&localState);
vxtemp.x = sqrtf(1-randno*randno)*cosf(phi);
vxtemp.y = sqrtf(1-randno*randno)*sinf(phi);
vxtemp.z = randno;
//printf("%d vx vy vz are %f %f %f\n", id, vxtemp.x,vxtemp.y,vxtemp.z);
x_gBrachy[(2*ind)%NPART]=xtemp; //avoid boundary excess
x_gBrachy[(2*ind+1)%NPART]=xtemp;
d_time[(2*ind)%NPART]=double(tref+ptime)*1e6;
d_time[(2*ind+1)%NPART]=double(tref+ptime)*1e6;
d_eventid[(2*ind)%NPART]=ind;
d_eventid[(2*ind+1)%NPART]=ind;
phi = TWOPI*curand_uniform(&localState);
randno=curand_normal(&localState)*NonAngle_d;
vxtemp.w=MC2+randno*MC2/2.0;//Noncollinearity
vx_gBrachy[(2*ind)%NPART]=vxtemp;
rotate(&(vxtemp.x), &(vxtemp.y), &(vxtemp.z),-cosf(randno), phi);
vxtemp.w=MC2-randno*MC2/2.0;
vx_gBrachy[(2*ind+1)%NPART]=vxtemp;
}
}
id+=blockDim.x*gridDim.x;
}
cuseed[id%NRAND]=localState;
}
__global__ void setPositionForPhoton(int total,int curpar, int useprange)
/*******************************************************************
c* Sample photon information from positron PSF *
c******************************************************************/
{
int id=blockIdx.x*blockDim.x + threadIdx.x;
curandState localState = cuseed[id%NRAND];
float randno, phi;
float3 xtemp, tmptmp;
float4 vxtemp;
while(id<total)
{
xtemp = x_gBrachy[id];
vxtemp = vx_gBrachy[id];
if(useprange == 1)
{
xtemp = setPositronRange(xtemp, vxtemp, &localState, 1);
}
randno = -1+2*curand_uniform(&localState);
phi = TWOPI*curand_uniform(&localState);
vxtemp.x = sqrtf(1-randno*randno)*cosf(phi);
vxtemp.y = sqrtf(1-randno*randno)*sinf(phi);
vxtemp.z = randno;
x_gBrachy[id]=xtemp; //avoid boundary excess
x_gBrachy[(id+total)%NPART]=xtemp;
d_eventid[id]=curpar+id;
d_eventid[(id+total)%NPART]=curpar+id;
phi = TWOPI*curand_uniform(&localState);
randno=curand_normal(&localState)*NonAngle_d;
vxtemp.w=MC2+randno*MC2/2.0;
vx_gBrachy[id]=vxtemp;
rotate(&(vxtemp.x), &(vxtemp.y), &(vxtemp.z),-cosf(randno), phi);
vxtemp.w=MC2-randno*MC2/2.0;
vx_gBrachy[(id+total)%NPART]=vxtemp;
id+=blockDim.x*gridDim.x;
}
cuseed[id%NRAND]=localState;
}
//digitizer
void __global__ setSitenum(int total, Event* events_d,int depth)
/*******************************************************************
c* set site index according to depth *
c******************************************************************/
{
int id=blockIdx.x*blockDim.x + threadIdx.x;
while(id<total)
{
switch(depth)
{
case 0:
{
events_d[id].siten=0;
break;
}
case 1:
{
events_d[id].siten=events_d[id].pann;
break;
}
case 2:
{
events_d[id].siten=events_d[id].pann*moduleN+events_d[id].modn;
break;
}
case 3:
{
events_d[id].siten=events_d[id].pann*moduleN*crystalN+events_d[id].modn*crystalN+events_d[id].cryn;
break;
}
}
id+=blockDim.x*gridDim.x;
}
}
void __global__ energywindow(int* counts, Event* events,int total, float thresholder, float upholder)
//this is for the energy window part in digitizer
{
int id=blockIdx.x*blockDim.x + threadIdx.x;
int num=0;
while(id<total)
{
if(events[id].E<thresholder || events[id].E>upholder)
{
events[id].t=MAXT;
num++;
}
id+=blockDim.x*gridDim.x;
}
if(num) atomicSub(counts,num);
}
void __global__ deadtime(int* counts,Event* events,int total, float interval, int deadtype)
{
//this is the deadtime part in digitizer
//deadtype 0 for paralysable, 1 for non
int id=blockIdx.x*blockDim.x + threadIdx.x;
int start,current,i,k;
float tdead;
while(id<total)
{
start=id;
if(start==0||events[start].siten!=events[start-1].siten||events[start].t>(events[start-1].t+interval))//find the start index
{
current=start;
i=current+1;
k=0;
tdead=events[start].t;
while(i<total)
{
while(events[i].siten==events[current].siten && events[i].t<(tdead+interval))
{
//events[current].E+=events[i].E;
if(!deadtype) {
tdead=events[i].t; //paralyzable accounts for pile-up effect
//events[current].t=events[i].t;
}
events[i].t=MAXT;
i++;
k++;
if(i==total) break;
}
if(i==total) break;
if(events[i].siten!=events[i-1].siten||events[i].t>(events[i-1].t+interval))
break;
current=i;
tdead=events[current].t;
i++;
}
atomicSub(counts,k);
}
id+=blockDim.x*gridDim.x;
}
}
void __global__ addnoise(int* counts, Event* events_d, float lambda, float Emean, float sigma, float interval)
{
//this is the noise part for digitizer
int id = blockIdx.x*blockDim.x + threadIdx.x;
Event events[6];
float t=id*interval;//0;
curandState localstate = cuseed[id%NRAND];
int i=0, ind=0;
while(t<(id+1)*interval)
{
t+=-__logf(curand_uniform(&localstate))*lambda;
if(t<(id+1)*interval)
{
events[i].t=t;//+id*interval;
events[i].E=Emean+sigma*curand_normal(&localstate);//2.355;
events[i].x=curand_uniform(&localstate);//need to be implemented to be matched to global coordinates
events[i].y=curand_uniform(&localstate);
events[i].z=curand_uniform(&localstate);
events[i].parn=-1;
events[i].pann=int(dev_totalPanels*curand_uniform(&localstate));
events[i].modn=int(moduleN*curand_uniform(&localstate));
events[i].cryn=int(crystalN*curand_uniform(&localstate));
events[i].siten=events[i].pann*moduleN*crystalN+events[i].modn*crystalN+events[i].cryn;
i=(i+1)%6;
if(!i)
{
ind=atomicAdd(counts,6);
for(int j=0; j<6; j++)
events_d[ind+j]=events[j];
}
}
}
cuseed[id]=localstate;
ind=atomicAdd(counts,i);
for(int j=0; j<i; j++)
events_d[ind+j]=events[j];
}
int __device__ adder(int* counts_d, Event* events_d, Event event)
{
//this is the adder part in digitizer
for(int i=0; i < counts_d[0]; i++)
{
if(event.siten == events_d[i].siten)
{
events_d[i].x = (events_d[i].x*events_d[i].E + event.x*event.E)/(events_d[i].E + event.E);
events_d[i].y = (events_d[i].y*events_d[i].E + event.y*event.E)/(events_d[i].E + event.E);
events_d[i].z = (events_d[i].z*events_d[i].E + event.z*event.E)/(events_d[i].E + event.E);
events_d[i].E = (events_d[i].E + event.E);
return 1;
}
}
//no recorded event inside the the same crystal
events_d[counts_d[0]]=event;
counts_d[0]++;
return 1;
}
int __device__ readout(int* counts_d, Event* events_d,int depth, int policy)
{
//this is for the readout part in digitizer
//depth means the readout level. 0,1,2,3 represents world,panel,module,cry
//policy 0,1 for winnertakeall and energy centroid
if(depth==3) return 1;
if(policy==1) depth = 2;
//the readout part
switch(depth)
{
case 0:
{
for(int i=0; i<counts_d[0]; i++)
events_d[i].siten=0;
break;
}
case 1:
{
for(int i=0; i<counts_d[0]; i++)
events_d[i].siten=events_d[i].pann;
break;
}
case 2:
{
for(int i=0; i<counts_d[0]; i++)
events_d[i].siten=events_d[i].pann*moduleN+events_d[i].modn;
break;
}
}
int ind=0;
for(int i=0; i<counts_d[0]; i++)
{
Event event0 = events_d[i];
if(event0.t>MAXT*0.1) continue;
for(int j=i+1; j<counts_d[0]; j++)
{
Event event = events_d[j];
if((event.parn==event0.parn)&&(event.siten == event0.siten))
{
if(policy==1)
{
event0.x = (event0.x*event0.E + event.x*event.E)/(event0.E + event.E);
event0.y = (event0.y*event0.E + event.y*event.E)/(event0.E + event.E);
event0.z = (event0.z*event0.E + event.z*event.E)/(event0.E + event.E);
event0.E = (event0.E + event.E);
events_d[j].t=MAXT;
continue;
}
event0=(event0.E>event.E)?event0:event;
events_d[j].t=MAXT;
}
}
events_d[ind]=event0;
ind++;
}
counts_d[1]=ind;
return 1;
}
void __global__ blur(int total, Event* events, int Eblurpolicy, float Eref, float Rref, float slope, float Spaceblur)
{
//this is the energy blurring part in digitizer
int i = blockIdx.x*blockDim.x + threadIdx.x;
float R=0;
curandState localstate=cuseed[i%NRAND];
while(i<total)
{
if(Eblurpolicy==0) R = sqrt(Eref/events[i].E)*Rref;
if(Eblurpolicy==1) R = Rref+slope*(events[i].E-Eref)/1e6; //slope in 1/MeV
if(R<0) R=0;
events[i].E += curand_normal(&localstate)*R*events[i].E/2.35482;
//other distribution of energy blurring need to be implemented
if(Spaceblur>0)
{
events[i].x+=Spaceblur*curand_normal(&localstate);
events[i].y+=Spaceblur*curand_normal(&localstate);
events[i].z+=Spaceblur*curand_normal(&localstate);
}
i+=blockDim.x*gridDim.x;
}
cuseed[i%NRAND]=localstate;
}
__global__ void photonde(Event* events_d, int* counts_d, int nactive, int bufferID, float* dens, int *mat, int *panelID, float *lenx, float *leny, float *lenz,
float *MODx, float *MODy, float *MODz, float *Msx, float *Msy, float *Msz, float *LSOx, float *LSOy, float *LSOz, float *sx, float *sy, float *sz,
float *ox, float *oy, float *oz, float *dx, float *dy, float *dz, float *UXx, float *UXy, float *UXz,
float *UYx, float *UYy, float *UYz,float *UZx, float *UZy, float *UZz)
/*******************************************************************
c* Transports a photon until it either escapes from the *
c* detector or its energy drops below EabsPhoton *
c* *
c******************************************************************/
{
int id = blockIdx.x*blockDim.x + threadIdx.x;
int tid=threadIdx.x;
Event events[4];
int counts[2]= {0,4};
Event event;
float tempDen=0.0f;
int tempMat=0;
__shared__ int nsstktemp;
if(tid==0)
{
nsstktemp = 0;
}
__syncthreads();
__shared__ float sftemp[NSSTACKSHARED];
__shared__ int sidtemp[NSSTACKSHARED];
extern __shared__ float s[];
float *dens_S = s;
int *mat_S = (int*)&dens_S[2];
int *panelID_S = (int*)&mat_S[2];
float *lenx_S = (float*)&panelID_S[dev_totalPanels];
float *leny_S = (float*)&lenx_S[dev_totalPanels];
float *lenz_S = (float*)&leny_S[dev_totalPanels];
float *MODx_S = (float*)&lenz_S[dev_totalPanels];
float *MODy_S = (float*)&MODx_S[dev_totalPanels];
float *MODz_S = (float*)&MODy_S[dev_totalPanels];
float *Msx_S = (float*)&MODz_S[dev_totalPanels];
float *Msy_S = (float*)&Msx_S[dev_totalPanels];
float *Msz_S = (float*)&Msy_S[dev_totalPanels];
float *LSOx_S = (float*)&Msz_S[dev_totalPanels];
float *LSOy_S = (float*)&LSOx_S[dev_totalPanels];
float *LSOz_S = (float*)&LSOy_S[dev_totalPanels];
float *sx_S = (float*)&LSOz_S[dev_totalPanels];
float *sy_S = (float*)&sx_S[dev_totalPanels];
float *sz_S = (float*)&sy_S[dev_totalPanels];
float *ox_S = (float*)&sz_S[dev_totalPanels];
float *oy_S = (float*)&ox_S[dev_totalPanels];
float *oz_S = (float*)&oy_S[dev_totalPanels];
float *dx_S = (float*)&oz_S[dev_totalPanels];
float *dy_S = (float*)&dx_S[dev_totalPanels];
float *dz_S = (float*)&dy_S[dev_totalPanels];
float *UXx_S = (float*)&dz_S[dev_totalPanels];
float *UXy_S = (float*)&UXx_S[dev_totalPanels];
float *UXz_S = (float*)&UXy_S[dev_totalPanels];
float *UYx_S = (float*)&UXz_S[dev_totalPanels];
float *UYy_S = (float*)&UYx_S[dev_totalPanels];
float *UYz_S = (float*)&UYy_S[dev_totalPanels];
float *UZx_S = (float*)&UYz_S[dev_totalPanels];
float *UZy_S = (float*)&UZx_S[dev_totalPanels];
float *UZz_S = (float*)&UZy_S[dev_totalPanels];
if(tid==0)
{
for (int i=0; i<2; i++)
{
mat_S[i]=mat[i];
dens_S[i]=dens[i];
}
for(int i=0; i<dev_totalPanels; i++)
{
panelID_S[i]=panelID[i];
lenx_S[i]=lenx[i];
leny_S[i]=leny[i];
lenz_S[i]=lenz[i];
MODx_S[i]=MODx[i];
MODy_S[i]=MODy[i];
MODz_S[i]=MODz[i];
Msx_S[i]=Msx[i];
Msy_S[i]=Msy[i];
Msz_S[i]=Msz[i];
LSOx_S[i]=LSOx[i];
LSOy_S[i]=LSOy[i];
LSOz_S[i]=LSOz[i];
sx_S[i]=sx[i];
sy_S[i]=sy[i];
sz_S[i]=sz[i];
ox_S[i]=ox[i];
oy_S[i]=oy[i];
oz_S[i]=oz[i];
dx_S[i]=dx[i];
dy_S[i]=dy[i];
dz_S[i]=dz[i];
UXx_S[i]=UXx[i];
UXy_S[i]=UXy[i];
UXz_S[i]=UXz[i];
UYx_S[i]=UYx[i];
UYy_S[i]=UYy[i];
UYz_S[i]=UYz[i];
UZx_S[i]=UZx[i];
UZy_S[i]=UZy[i];
UZz_S[i]=UZz[i];
}//*/
}
__syncthreads();
// obtain current id on thread
curandState localState = cuseed[id%NRAND];
if( id < nactive )
{
if(d_time[id]>0)
{
float3 xtemp = x_gBrachy[id];
float4 vxtemp = vx_gBrachy[id];
double tof = d_time[id];
int eid = d_eventid[id];
// change global coordinates to local coordinates
int paID=-1;
float3 xtemp2;
float4 vxtemp2;
//get the panelid crystal id that the particle enters???
for (int i=0; i<dev_totalPanels; i++)
{
//new coordinates
float tempx=(xtemp.x-ox_S[i])*UXx_S[i]+(xtemp.y-oy_S[i])*UXy_S[i]+(xtemp.z-oz_S[i])*UXz_S[i];
float tempy=(xtemp.x-ox_S[i])*UYx_S[i]+(xtemp.y-oy_S[i])*UYy_S[i]+(xtemp.z-oz_S[i])*UYz_S[i];
float tempz=(xtemp.x-ox_S[i])*UZx_S[i]+(xtemp.y-oy_S[i])*UZy_S[i]+(xtemp.z-oz_S[i])*UZz_S[i];
float tempvx=vxtemp.x*UXx[i]+vxtemp.y*UXy[i]+vxtemp.z*UXz[i];//component along different directions
float tempvy=vxtemp.x*UYx[i]+vxtemp.y*UYy[i]+vxtemp.z*UYz[i];
float tempvz=vxtemp.x*UZx[i]+vxtemp.y*UZy[i]+vxtemp.z*UZz[i];
float tempx2=0.0f;
if(tempvx*dx_S[i]>=0)
{
float tempy2=tempy-tempx/tempvx*tempvy;
float tempz2=tempz-tempx/tempvx*tempvz;
if(abs(tempy2)<leny_S[i]/2 & abs(tempz2)<lenz_S[i]/2)
{
xtemp2.x=tempx2;
xtemp2.y=tempy2;
xtemp2.z=tempz2;
//xtemp2.w=xtemp.w;
tof += -tempx/(29979.2458*tempvx);
vxtemp2.x=tempvx;
vxtemp2.y=tempvy;
vxtemp2.z=tempvz;
vxtemp2.w=vxtemp.w;
paID=panelID_S[i];
break;
}
}
float tempy2=tempy-tempx/tempvx*tempvy;
float tempz2=tempz-tempx/tempvx*tempvz;
xtemp2.x=tempx2;
xtemp2.y=tempy2;