3f56f1f9
 dmayerich
initial commit
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__global__ void field_intensity(bsComplex* x, bsComplex* y, bsComplex* z, ptype* I, unsigned int N)
{
//compute the index for this thread
int i = blockIdx.x * blockDim.x + threadIdx.x;
if(i >= N) return;
ptype xm = x[i].abs();
if(y != NULL && z != NULL)
{
ptype ym = y[i].abs();
ptype zm = z[i].abs();
I[i] = xm*xm + ym*ym + zm*zm;
}
else
{
I[i] = xm*xm;
}
}
__global__ void resample_intensity(bsComplex* x, bsComplex* y, bsComplex* z, ptype* D, int uR, int vR, int ss)
{
//get the current coordinate in the plane slice
int iu = blockIdx.x * blockDim.x + threadIdx.x;
int iv = blockIdx.y * blockDim.y + threadIdx.y;
//make sure that the thread indices are in-bounds
if(iu >= uR || iv >= vR) return;
//compute the index into the detector
int i = iv*uR + iu;
//compute the index into the field
int fi;
//initialize the intensity for the pixel to zero
ptype I = 0;
ptype xm = 0;
ptype ym = 0;
ptype zm = 0;
int ix, iy;
for(ix = 0; ix<ss; ix++)
for(iy = 0; iy<ss; iy++)
{
//fi = iv*ss*ss*uR + iy*ss*uR + iu*ss + ix;
fi = (iv*ss + iy)*ss*uR + iu*ss + ix;
if(x !=NULL)
xm = x[fi].abs();
if(y != NULL)
ym = y[fi].abs();
if(z != NULL)
zm = z[fi].abs();
I += xm*xm + ym*ym + zm*zm;
}
D[i] += I/(ss*ss);
}
__global__ void field_real(bsComplex* field_component, ptype* V, unsigned int N)
{
//compute the index for this thread
int i = blockIdx.x * blockDim.x + threadIdx.x;
if(i >= N) return;
V[i] = field_component[i].real();
}
__global__ void field_imaginary(bsComplex* field_component, ptype* V, unsigned int N)
{
//compute the index for this thread
int i = blockIdx.x * blockDim.x + threadIdx.x;
if(i >= N) return;
V[i] = field_component[i].imag();
}
__global__ void field_sqrt(ptype* input, ptype* output, unsigned int N)
{
//compute the index for this thread
int i = blockIdx.x * blockDim.x + threadIdx.x;
if(i >= N) return;
output[i] = sqrt(input[i]);
}
__global__ void field_scale(bsComplex* x, bsComplex* y, bsComplex* z, unsigned int N, ptype v)
{
//compute the index for this thread
int i = blockIdx.x * blockDim.x + threadIdx.x;
if(i >= N) return;
if(x != NULL)
x[i] *= v;
if(y != NULL)
y[i] *= v;
if(z != NULL)
z[i] *= v;
}
scalarslice fieldslice::Mag()
{
//compute the magnitude of the field at each rtsPoint in the slice
scalarslice* result = new scalarslice(R[0], R[1]);
//compute the total number of values in the slice
unsigned int N = R[0] * R[1];
int gridDim = (N+BLOCK-1)/BLOCK;
field_intensity<<<gridDim, BLOCK>>>(x_hat, y_hat, z_hat, result->S, N);
field_sqrt<<<gridDim, BLOCK>>>(result->S, result->S, N);
return *result;
}
scalarslice fieldslice::Real()
{
//compute the magnitude of the field at each rtsPoint in the slice
//create a scalar slice at the same resolution as the field
scalarslice* result = new scalarslice(R[0], R[1]);
//compute the total number of values in the slice
unsigned int N = R[0] * R[1];
int gridDim = (N+BLOCK-1)/BLOCK;
field_real<<<gridDim, BLOCK>>>(x_hat, result->S, N);
return *result;
}
scalarslice fieldslice::Imag()
{
//compute the magnitude of the field at each rtsPoint in the slice
//create a scalar slice at the same resolution as the field
scalarslice* result = new scalarslice(R[0], R[1]);
//compute the total number of values in the slice
unsigned int N = R[0] * R[1];
int gridDim = (N+BLOCK-1)/BLOCK;
field_imaginary<<<gridDim, BLOCK>>>(x_hat, result->S, N);
return *result;
}
void fieldslice::IntegrateAndResample(scalarslice* detector, unsigned int supersample)
{
//compute the intensity and resample at the detector resolution
unsigned int D[2];
D[0] = detector->R[0];
D[1] = detector->R[1];
//create one thread for each detector pixel
dim3 dimBlock(SQRT_BLOCK, SQRT_BLOCK);
dim3 dimGrid((D[0] + SQRT_BLOCK -1)/SQRT_BLOCK, (D[1] + SQRT_BLOCK - 1)/SQRT_BLOCK);
resample_intensity<<<dimGrid, dimBlock>>>(x_hat, y_hat, z_hat, detector->S, D[0], D[1], supersample);
}
scalarslice fieldslice::Intensity()
{
//compute the magnitude of the field at each rtsPoint in the slice
//create a scalar slice at the same resolution as the field
scalarslice* result = new scalarslice(R[0], R[1]);
//compute the total number of values in the slice
unsigned int N = R[0] * R[1];
int gridDim = (N+BLOCK-1)/BLOCK;
field_intensity<<<gridDim, BLOCK>>>(x_hat, y_hat, z_hat, result->S, N);
return *result;
}
void fieldslice::ScaleField(ptype v)
{
//This function scales the field by some constant value v
//This is mostly used for the inverse FFT, which has to divide the field by R^2
//compute the total number of values in the slice
unsigned int N = R[0] * R[1];
//cout<<"Size of mag field: "<<N<<endl;
int gridDim = (N+BLOCK-1)/BLOCK;
field_scale<<<gridDim, BLOCK>>>(x_hat, y_hat, z_hat, N, v);
}
void fieldslice::init_gpu()
{
//allocate space on the GPU for the field slice
HANDLE_ERROR(cudaMalloc((void**)&x_hat, R[0] * R[1] * sizeof(bsComplex)));
//HANDLE_ERROR(cudaMemset(x_hat, 0, R[0] * R[1] * sizeof(bsComplex)));
//if the field is scalar, y_hat and z_hat are unused
if(scalarField)
{
y_hat = NULL;
z_hat = NULL;
}
else
{
HANDLE_ERROR(cudaMalloc((void**)&y_hat, R[0] * R[1] * sizeof(bsComplex)));
//HANDLE_ERROR(cudaMemset(y_hat, 0, R[0] * R[1] * sizeof(bsComplex)));
HANDLE_ERROR(cudaMalloc((void**)&z_hat, R[0] * R[1] * sizeof(bsComplex)));
//HANDLE_ERROR(cudaMemset(z_hat, 0, R[0] * R[1] * sizeof(bsComplex)));
}
clear_gpu();
}
void fieldslice::kill_gpu()
{
if(x_hat != NULL)
HANDLE_ERROR(cudaFree(x_hat));
if(y_hat != NULL)
HANDLE_ERROR(cudaFree(y_hat));
if(z_hat != NULL)
HANDLE_ERROR(cudaFree(z_hat));
}
void fieldslice::clear_gpu()
{
int memsize = R[0] * R[1] * sizeof(bsComplex);
if(x_hat != NULL)
HANDLE_ERROR(cudaMemset(x_hat, 0, memsize));
if(y_hat != NULL)
HANDLE_ERROR(cudaMemset(y_hat, 0, memsize));
if(z_hat != NULL)
HANDLE_ERROR(cudaMemset(z_hat, 0, memsize));
}
__global__ void copy_crop(bsComplex* source, bsComplex* dest, int u, int v, int su, int sv, int uR, int vR)
{
//get the current coordinate in the plane slice
int iu = blockIdx.x * blockDim.x + threadIdx.x;
int iv = blockIdx.y * blockDim.y + threadIdx.y;
//make sure that the thread indices are in-bounds
if(iu >= su || iv >= sv) return;
//compute the destination index
int i = iv*su + iu;
//compute the source index
int sourceV = v + iv;
int sourceU = u + iu;
int is = sourceV * uR + sourceU;
dest[i] = source[is];
}
fieldslice fieldslice::crop(int u, int v, int su, int sv)
{
//create a new field slice with the appropriate settings
fieldslice result(su, sv);
result.scalarField = scalarField;
//allocate space for the new field
result.init_gpu();
//create one thread for each pixel of the field slice
dim3 dimBlock(SQRT_BLOCK, SQRT_BLOCK);
dim3 dimGrid((su + SQRT_BLOCK -1)/SQRT_BLOCK, (sv + SQRT_BLOCK - 1)/SQRT_BLOCK);
//call a kernel to copy the cropped to the new field slice
if(x_hat != NULL)
copy_crop<<<dimGrid, dimBlock>>>(x_hat, result.x_hat, u, v, su, sv, R[0], R[1]);
if(y_hat != NULL)
copy_crop<<<dimGrid, dimBlock>>>(y_hat, result.y_hat, u, v, su, sv, R[0], R[1]);
if(z_hat != NULL)
copy_crop<<<dimGrid, dimBlock>>>(z_hat, result.z_hat, u, v, su, sv, R[0], R[1]);
return result;
}
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