snapshot 2022-11-24 22:29:08.023001
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111
fdtd/kernels/update_e_full.cl
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111
fdtd/kernels/update_e_full.cl
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//CL//
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/*
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* Update E-field, including any PMLs.
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*
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* Template parameters:
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* common_header: Rendered contents of common.cl
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* pmls: [('x', 'n'), ('z', 'p'),...] list of pml axes and polarities
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* pml_thickness: Number of cells (integer)
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*
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* OpenCL args:
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* E, H, dt, eps, [p{01}e{np}, Psi_{xyz}{np}_E]
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*/
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#pragma OPENCL EXTENSION cl_khr_3d_image_writes : enable
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#define read_field(E, x, y, z) read_imagef(E, sampler, (int4)(z, y, x, 0))
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#define write_field(E, x, y, z, E__) write_imagef(E, (int4)(z, y, x, 0), E__)
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const sampler_t sampler = CLK_FILTER_NEAREST | \
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CLK_NORMALIZED_COORDS_FALSE | \
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CLK_ADDRESS_NONE;
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__kernel void update_e(
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__global float* E,
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__read_only image3d_t H,
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const float dt,
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__read_only image3d_t eps,
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const size_t n
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) {
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size_t lid = get_local_id(0);
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size_t gsize = get_global_size(0);
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size_t work_group_start = get_local_size(0) * get_group_id(0);
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size_t i;
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for (i = work_group_start + lid; i < n; i += gsize) {
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{{common_header | indent(8, False)}}
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////////////////////////////////////////////////////////////////////////////
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float4 eps__ = read_field(eps, x, y, z);
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float4 H__ = read_field(H, x, y, z);
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float4 Hmx = read_field(H, x + mx, y, z);
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float4 Hmy = read_field(H, x, y + my, z);
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float4 Hmz = read_field(H, x, y, z + mz);
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{% if pmls -%}
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const int pml_thickness = {{pml_thickness}};
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{%- endif %}
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/*
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* Precalclate derivatives
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*/
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float dHxy = H__.x - Hmy.x;
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float dHxz = H__.x - Hmz.x;
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float dHyx = H__.y - Hmx.y;
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float dHyz = H__.y - Hmz.y;
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float dHzx = H__.z - Hmx.z;
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float dHzy = H__.z - Hmy.z;
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/*
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* PML Update
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*/
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// PML effects on E
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float pExi = 0;
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float pEyi = 0;
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float pEzi = 0;
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{% for r, p in pmls -%}
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{%- set u, v = ['x', 'y', 'z'] | reject('equalto', r) -%}
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{%- set psi = 'Psi_' ~ r ~ p ~ '_E' -%}
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{%- if r != 'y' -%}
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{%- set se, sh = '-', '+' -%}
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{%- else -%}
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{%- set se, sh = '+', '-' -%}
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{%- endif -%}
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{%- if p == 'n' %}
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if ( {{r}} < pml_thickness ) {
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const size_t ir = {{r}}; // index into pml parameters
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{%- elif p == 'p' %}
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if ( s{{r}} > {{r}} && {{r}} >= s{{r}} - pml_thickness ) {
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const size_t ir = (s{{r}} - 1) - {{r}}; // index into pml parameters
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{%- endif %}
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const size_t ip = {{v}} + {{u}} * s{{v}} + ir * s{{v}} * s{{u}}; // linear index into Psi
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{{psi ~ u}}[ip] = p0e{{p}}[ir] * {{psi ~ u}}[ip] + p1e{{p}}[ir] * dH{{v ~ r}};
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{{psi ~ v}}[ip] = p0e{{p}}[ir] * {{psi ~ v}}[ip] + p1e{{p}}[ir] * dH{{u ~ r}};
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pE{{u}}i {{se}}= {{psi ~ u}}[ip];
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pE{{v}}i {{sh}}= {{psi ~ v}}[ip];
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}
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{%- endfor %}
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/*
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* Update E
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*/
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float4 E__ = vload4(i, E);
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E__.x += dt / eps__.x * (dHzy - dHyz + pExi);
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E__.y += dt / eps__.y * (dHxz - dHzx + pEyi);
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E__.z += dt / eps__.z * (dHyx - dHxy + pEzi);
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vstore4(E__, i, E);
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}
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}
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139
fdtd/kernels/update_h_full.cl
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139
fdtd/kernels/update_h_full.cl
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//CL//
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/*
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* Update H-field, including any PMLs.
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* Also precalculate values for poynting vector if necessary.
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*
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* Template parameters:
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* common_header: Rendered contents of common.cl
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* pmls: [('x', 'n'), ('z', 'p'),...] list of pml axes and polarities
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* pml_thickness: Number of cells (integer)
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* do_poynting: Whether to precalculate poynting vector components (boolean)
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*
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* OpenCL args:
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* E, H, dt, [p{01}h{np}, Psi_{xyz}{np}_H], [oS]
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*/
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#pragma OPENCL EXTENSION cl_khr_3d_image_writes : enable
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#define read_field(E, x, y, z) read_imagef(E, sampler, (int4)(z, y, x, 0))
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#define write_field(E, x, y, z, E__) write_imagef(E, (int4)(z, y, x, 0), E__)
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const sampler_t sampler = CLK_FILTER_NEAREST | \
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CLK_NORMALIZED_COORDS_FALSE | \
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CLK_ADDRESS_NONE;
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__kernel void update_h(
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__read_only image3d_t E,
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__global float* H,
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const float dt,
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const size_t n
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{% if pmls -%}
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__global float* S,
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{%- endif %}
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) {
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size_t lid = get_local_id(0);
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size_t gsize = get_global_size(0);
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size_t work_group_start = get_local_size(0) * get_group_id(0);
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size_t i;
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for (i = work_group_start + lid; i < n; i += gsize) {
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{{common_header | indent(8, False)}}
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////////////////////////////////////////////////////////////////////////////
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float4 E__ = read_field(E, x, y, z);
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float4 Epx = read_field(E, x + px, y, z);
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float4 Epy = read_field(E, x, y + py, z);
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float4 Epz = read_field(E, x, y, z + pz);
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{% if pmls -%}
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const int pml_thickness = {{pml_thickness}};
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{%- endif %}
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/*
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* Precalculate derivatives
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*/
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float dExy = Epy.x - E__.x;
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float dExz = Epz.x - E__.x;
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float dEyx = Epx.y - E__.y;
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float dEyz = Epz.y - E__.y;
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float dEzx = Epx.z - E__.z;
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float dEzy = Epy.z - E__.z;
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/*
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* PML Update
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*/
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// PML contributions to H
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float pHxi = 0;
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float pHyi = 0;
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float pHzi = 0;
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{%- for r, p in pmls -%}
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{%- set u, v = ['x', 'y', 'z'] | reject('equalto', r) -%}
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{%- set psi = 'Psi_' ~ r ~ p ~ '_H' -%}
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{%- if r != 'y' -%}
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{%- set se, sh = '-', '+' -%}
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{%- else -%}
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{%- set se, sh = '+', '-' -%}
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{%- endif -%}
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{%- if p == 'n' %}
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if ( {{r}} < pml_thickness ) {
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const size_t ir = {{r}}; // index into pml parameters
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{%- elif p == 'p' %}
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if ( s{{r}} > {{r}} && {{r}} >= s{{r}} - pml_thickness ) {
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const size_t ir = (s{{r}} - 1) - {{r}}; // index into pml parameters
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{%- endif %}
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const size_t ip = {{v}} + {{u}} * s{{v}} + ir * s{{v}} * s{{u}}; // linear index into Psi
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{{psi ~ u}}[ip] = p0h{{p}}[ir] * {{psi ~ u}}[ip] + p1h{{p}}[ir] * dE{{v ~ r}};
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{{psi ~ v}}[ip] = p0h{{p}}[ir] * {{psi ~ v}}[ip] + p1h{{p}}[ir] * dE{{u ~ r}};
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pH{{u}}i {{sh}}= {{psi ~ u}}[ip];
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pH{{v}}i {{se}}= {{psi ~ v}}[ip];
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}
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{%- endfor %}
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/*
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* Update H
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*/
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{% if do_poynting -%}
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// Save old H for averaging
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float Hx_old = Hx[i];
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float Hy_old = Hy[i];
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float Hz_old = Hz[i];
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{%- endif %}
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// H update equations
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float4 H__ = vload4(i, H);
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H__.x -= dt * (dEzy - dEyz + pHxi);
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H__.y -= dt * (dExz - dEzx + pHyi);
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H__.z -= dt * (dEyx - dExy + pHzi);
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vstore4(H__, i, H);
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{% if do_poynting -%}
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// Average H across timesteps
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float aHxt = Hx[i] + Hx_old;
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float aHyt = Hy[i] + Hy_old;
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float aHzt = Hz[i] + Hz_old;
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/*
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* Calculate unscaled S components at H locations
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*/
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float4 S__;
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S__.x = Epx.y * aHzt - Epx.z * aHyt;
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S__.y = Epy.z * aHxt - Epy.x * aHzt;
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S__.z = Epz.x * aHyt - Epz.y * aHxt;
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write_field(S, x, y, z, S__);
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{%- endif -%}
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}
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}
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0
opencl_fdtd/version.py
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0
opencl_fdtd/version.py
Normal file
BIN
saved_simulation
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BIN
saved_simulation
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Binary file not shown.
565
sources.c
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565
sources.c
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/*
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* Update E-field, including any PMLs.
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*
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* Template parameters:
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* common_header: Rendered contents of common.cl
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* pmls: [{'axis': 'x', 'polarity': 'n', 'thickness': 8}, ...] list of pml dicts containing
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axes, polarities, and thicknesses.
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*
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* OpenCL args:
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* E, H, dt, eps, [p{01}e{np}, Psi_{xyz}{np}_E]
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*/
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typedef float ftype;
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/*
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* Field size info
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*/
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const size_t sx = 395;
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const size_t sy = 345;
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const size_t sz = 73;
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const size_t field_size = sx * sy * sz;
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//Since we use i to index into Ex[], Ey[], ... rather than E[], do nothing if
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// i is outside the bounds of Ex[].
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if (i >= field_size) {
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PYOPENCL_ELWISE_CONTINUE;
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}
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/*
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* Array indexing
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*/
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// Given a linear index i and shape (sx, sy, sz), defines x, y, and z
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// as the 3D indices of the current element (i).
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// (ie, converts linear index [i] to field indices (x, y, z)
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const size_t x = i / (sz * sy);
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const size_t y = (i - x * sz * sy) / sz;
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const size_t z = (i - y * sz - x * sz * sy);
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// Calculate linear index offsets corresponding to offsets in 3D
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// (ie, if E[i] <-> E(x, y, z), then E[i + diy] <-> E(x, y + 1, z)
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const size_t dix = sz * sy;
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const size_t diy = sz;
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const size_t diz = 1;
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/*
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* Pointer math
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*/
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//Pointer offsets into the components of a linearized vector-field
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// (eg. Hx = H + XX, where H and Hx are pointers)
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const size_t XX = 0;
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const size_t YY = field_size;
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const size_t ZZ = field_size * 2;
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//Define pointers to vector components of each field (eg. Hx = H + XX)
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__global ftype *Ex = E + XX;
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__global ftype *Ey = E + YY;
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__global ftype *Ez = E + ZZ;
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__global ftype *Hx = H + XX;
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__global ftype *Hy = H + YY;
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__global ftype *Hz = H + ZZ;
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/*
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* Implement periodic boundary conditions
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*
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* mx ([m]inus [x]) gives the index offset of the adjacent cell in the minus-x direction.
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* In the event that we start at x == 0, we actually want to wrap around and grab the cell
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* x_{-1} == (sx - 1) instead, ie. mx = (sx - 1) * dix .
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*
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* px ([p]lus [x]) gives the index offset of the adjacent cell in the plus-x direction.
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* In the event that we start at x == (sx - 1), we actually want to wrap around and grab
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* the cell x_{+1} == 0 instead, ie. px = -(sx - 1) * dix .
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*/
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int mx = -dix;
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int px = +dix;
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int wrap_x = (sx - 1) * dix;
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if ( x == 0 ) {
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mx = wrap_x;
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} else if ( x == sx - 1 ) {
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px = -wrap_x;
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}
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int my = -diy;
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int py = +diy;
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int wrap_y = (sy - 1) * diy;
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if ( y == 0 ) {
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my = wrap_y;
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} else if ( y == sy - 1 ) {
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py = -wrap_y;
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}
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int mz = -diz;
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int pz = +diz;
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int wrap_z = (sz - 1) * diz;
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if ( z == 0 ) {
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mz = wrap_z;
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} else if ( z == sz - 1 ) {
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pz = -wrap_z;
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}
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////////////////////////////////////////////////////////////////////////////
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__global ftype *epsx = eps + XX;
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__global ftype *epsy = eps + YY;
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__global ftype *epsz = eps + ZZ;
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/*
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* Precalclate derivatives
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*/
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ftype dHxy = Hx[i] - Hx[i + my];
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ftype dHxz = Hx[i] - Hx[i + mz];
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ftype dHyx = Hy[i] - Hy[i + mx];
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ftype dHyz = Hy[i] - Hy[i + mz];
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ftype dHzx = Hz[i] - Hz[i + mx];
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ftype dHzy = Hz[i] - Hz[i + my];
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/*
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* PML Update
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*/
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// PML effects on E
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ftype pExi = 0;
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ftype pEyi = 0;
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ftype pEzi = 0;
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int pml_xn_thickness = 8;
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if ( x < pml_xn_thickness ) {
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const size_t ir = x; // index into pml parameters
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const size_t ip = z + y * sz + ir * sz * sy; // linear index into Psi
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Psi_xn_Ey[ip] = px0en[ir] * Psi_xn_Ey[ip] + px1en[ir] * dHzx;
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Psi_xn_Ez[ip] = px0en[ir] * Psi_xn_Ez[ip] + px1en[ir] * dHyx;
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pEyi -= Psi_xn_Ey[ip];
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pEzi += Psi_xn_Ez[ip];
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}int pml_xp_thickness = 8;
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if ( sx > x && x >= sx - pml_xp_thickness ) {
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const size_t ir = (sx - 1) - x; // index into pml parameters
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const size_t ip = z + y * sz + ir * sz * sy; // linear index into Psi
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Psi_xp_Ey[ip] = px0ep[ir] * Psi_xp_Ey[ip] + px1ep[ir] * dHzx;
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Psi_xp_Ez[ip] = px0ep[ir] * Psi_xp_Ez[ip] + px1ep[ir] * dHyx;
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pEyi -= Psi_xp_Ey[ip];
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pEzi += Psi_xp_Ez[ip];
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}int pml_yn_thickness = 8;
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if ( y < pml_yn_thickness ) {
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const size_t ir = y; // index into pml parameters
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const size_t ip = z + x * sz + ir * sz * sx; // linear index into Psi
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Psi_yn_Ex[ip] = py0en[ir] * Psi_yn_Ex[ip] + py1en[ir] * dHzy;
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Psi_yn_Ez[ip] = py0en[ir] * Psi_yn_Ez[ip] + py1en[ir] * dHxy;
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pExi += Psi_yn_Ex[ip];
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pEzi -= Psi_yn_Ez[ip];
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}int pml_yp_thickness = 8;
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if ( sy > y && y >= sy - pml_yp_thickness ) {
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const size_t ir = (sy - 1) - y; // index into pml parameters
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const size_t ip = z + x * sz + ir * sz * sx; // linear index into Psi
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Psi_yp_Ex[ip] = py0ep[ir] * Psi_yp_Ex[ip] + py1ep[ir] * dHzy;
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Psi_yp_Ez[ip] = py0ep[ir] * Psi_yp_Ez[ip] + py1ep[ir] * dHxy;
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pExi += Psi_yp_Ex[ip];
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pEzi -= Psi_yp_Ez[ip];
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}int pml_zn_thickness = 8;
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||||
|
||||
if ( z < pml_zn_thickness ) {
|
||||
const size_t ir = z; // index into pml parameters
|
||||
const size_t ip = y + x * sy + ir * sy * sx; // linear index into Psi
|
||||
Psi_zn_Ex[ip] = pz0en[ir] * Psi_zn_Ex[ip] + pz1en[ir] * dHyz;
|
||||
Psi_zn_Ey[ip] = pz0en[ir] * Psi_zn_Ey[ip] + pz1en[ir] * dHxz;
|
||||
pExi -= Psi_zn_Ex[ip];
|
||||
pEyi += Psi_zn_Ey[ip];
|
||||
}int pml_zp_thickness = 8;
|
||||
|
||||
if ( sz > z && z >= sz - pml_zp_thickness ) {
|
||||
const size_t ir = (sz - 1) - z; // index into pml parameters
|
||||
const size_t ip = y + x * sy + ir * sy * sx; // linear index into Psi
|
||||
Psi_zp_Ex[ip] = pz0ep[ir] * Psi_zp_Ex[ip] + pz1ep[ir] * dHyz;
|
||||
Psi_zp_Ey[ip] = pz0ep[ir] * Psi_zp_Ey[ip] + pz1ep[ir] * dHxz;
|
||||
pExi -= Psi_zp_Ex[ip];
|
||||
pEyi += Psi_zp_Ey[ip];
|
||||
}
|
||||
|
||||
/*
|
||||
* Update E
|
||||
*/
|
||||
Ex[i] += dt / epsx[i] * (dHzy - dHyz + pExi);
|
||||
Ey[i] += dt / epsy[i] * (dHxz - dHzx + pEyi);
|
||||
Ez[i] += dt / epsz[i] * (dHyx - dHxy + pEzi);
|
||||
==========================================
|
||||
/*
|
||||
* Update H-field, including any PMLs.
|
||||
* Also precalculate values for poynting vector if necessary.
|
||||
*
|
||||
* Template parameters:
|
||||
* common_header: Rendered contents of common.cl
|
||||
* pmls: [{'axis': 'x', 'polarity': 'n', 'thickness': 8}, ...] list of pml dicts containing
|
||||
axes, polarities, and thicknesses.
|
||||
* do_poynting: Whether to precalculate poynting vector components (boolean)
|
||||
*
|
||||
* OpenCL args:
|
||||
* E, H, dt, [p{xyz}{01}h{np}, Psi_{xyz}{np}_H], [oS]
|
||||
*/
|
||||
|
||||
|
||||
|
||||
typedef float ftype;
|
||||
|
||||
|
||||
/*
|
||||
* Field size info
|
||||
*/
|
||||
const size_t sx = 395;
|
||||
const size_t sy = 345;
|
||||
const size_t sz = 73;
|
||||
const size_t field_size = sx * sy * sz;
|
||||
|
||||
//Since we use i to index into Ex[], Ey[], ... rather than E[], do nothing if
|
||||
// i is outside the bounds of Ex[].
|
||||
if (i >= field_size) {
|
||||
PYOPENCL_ELWISE_CONTINUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Array indexing
|
||||
*/
|
||||
// Given a linear index i and shape (sx, sy, sz), defines x, y, and z
|
||||
// as the 3D indices of the current element (i).
|
||||
// (ie, converts linear index [i] to field indices (x, y, z)
|
||||
const size_t x = i / (sz * sy);
|
||||
const size_t y = (i - x * sz * sy) / sz;
|
||||
const size_t z = (i - y * sz - x * sz * sy);
|
||||
|
||||
// Calculate linear index offsets corresponding to offsets in 3D
|
||||
// (ie, if E[i] <-> E(x, y, z), then E[i + diy] <-> E(x, y + 1, z)
|
||||
const size_t dix = sz * sy;
|
||||
const size_t diy = sz;
|
||||
const size_t diz = 1;
|
||||
|
||||
|
||||
/*
|
||||
* Pointer math
|
||||
*/
|
||||
//Pointer offsets into the components of a linearized vector-field
|
||||
// (eg. Hx = H + XX, where H and Hx are pointers)
|
||||
const size_t XX = 0;
|
||||
const size_t YY = field_size;
|
||||
const size_t ZZ = field_size * 2;
|
||||
|
||||
//Define pointers to vector components of each field (eg. Hx = H + XX)
|
||||
__global ftype *Ex = E + XX;
|
||||
__global ftype *Ey = E + YY;
|
||||
__global ftype *Ez = E + ZZ;
|
||||
|
||||
__global ftype *Hx = H + XX;
|
||||
__global ftype *Hy = H + YY;
|
||||
__global ftype *Hz = H + ZZ;
|
||||
|
||||
|
||||
/*
|
||||
* Implement periodic boundary conditions
|
||||
*
|
||||
* mx ([m]inus [x]) gives the index offset of the adjacent cell in the minus-x direction.
|
||||
* In the event that we start at x == 0, we actually want to wrap around and grab the cell
|
||||
* x_{-1} == (sx - 1) instead, ie. mx = (sx - 1) * dix .
|
||||
*
|
||||
* px ([p]lus [x]) gives the index offset of the adjacent cell in the plus-x direction.
|
||||
* In the event that we start at x == (sx - 1), we actually want to wrap around and grab
|
||||
* the cell x_{+1} == 0 instead, ie. px = -(sx - 1) * dix .
|
||||
*/
|
||||
|
||||
int mx = -dix;
|
||||
int px = +dix;
|
||||
int wrap_x = (sx - 1) * dix;
|
||||
if ( x == 0 ) {
|
||||
mx = wrap_x;
|
||||
} else if ( x == sx - 1 ) {
|
||||
px = -wrap_x;
|
||||
}
|
||||
|
||||
int my = -diy;
|
||||
int py = +diy;
|
||||
int wrap_y = (sy - 1) * diy;
|
||||
if ( y == 0 ) {
|
||||
my = wrap_y;
|
||||
} else if ( y == sy - 1 ) {
|
||||
py = -wrap_y;
|
||||
}
|
||||
|
||||
int mz = -diz;
|
||||
int pz = +diz;
|
||||
int wrap_z = (sz - 1) * diz;
|
||||
if ( z == 0 ) {
|
||||
mz = wrap_z;
|
||||
} else if ( z == sz - 1 ) {
|
||||
pz = -wrap_z;
|
||||
}
|
||||
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
/*
|
||||
* Precalculate derivatives
|
||||
*/
|
||||
ftype dExy = Ex[i + py] - Ex[i];
|
||||
ftype dExz = Ex[i + pz] - Ex[i];
|
||||
|
||||
ftype dEyx = Ey[i + px] - Ey[i];
|
||||
ftype dEyz = Ey[i + pz] - Ey[i];
|
||||
|
||||
ftype dEzx = Ez[i + px] - Ez[i];
|
||||
ftype dEzy = Ez[i + py] - Ez[i];
|
||||
|
||||
|
||||
/*
|
||||
* Precalculate averaged E
|
||||
*/
|
||||
ftype aExy = Ex[i + py] + Ex[i];
|
||||
ftype aExz = Ex[i + pz] + Ex[i];
|
||||
|
||||
ftype aEyx = Ey[i + px] + Ey[i];
|
||||
ftype aEyz = Ey[i + pz] + Ey[i];
|
||||
|
||||
ftype aEzx = Ez[i + px] + Ez[i];
|
||||
ftype aEzy = Ez[i + py] + Ez[i];
|
||||
|
||||
|
||||
/*
|
||||
* PML Update
|
||||
*/
|
||||
// PML contributions to H
|
||||
ftype pHxi = 0;
|
||||
ftype pHyi = 0;
|
||||
ftype pHzi = 0;
|
||||
|
||||
int pml_xn_thickness = 8;
|
||||
|
||||
if ( x < pml_xn_thickness ) {
|
||||
const size_t ir = x; // index into pml parameters
|
||||
const size_t ip = z + y * sz + ir * sz * sy; // linear index into Psi
|
||||
Psi_xn_Hy[ip] = px0hn[ir] * Psi_xn_Hy[ip] + px1hn[ir] * dEzx;
|
||||
Psi_xn_Hz[ip] = px0hn[ir] * Psi_xn_Hz[ip] + px1hn[ir] * dEyx;
|
||||
pHyi += Psi_xn_Hy[ip];
|
||||
pHzi -= Psi_xn_Hz[ip];
|
||||
}int pml_xp_thickness = 8;
|
||||
|
||||
if ( sx > x && x >= sx - pml_xp_thickness ) {
|
||||
const size_t ir = (sx - 1) - x; // index into pml parameters
|
||||
const size_t ip = z + y * sz + ir * sz * sy; // linear index into Psi
|
||||
Psi_xp_Hy[ip] = px0hp[ir] * Psi_xp_Hy[ip] + px1hp[ir] * dEzx;
|
||||
Psi_xp_Hz[ip] = px0hp[ir] * Psi_xp_Hz[ip] + px1hp[ir] * dEyx;
|
||||
pHyi += Psi_xp_Hy[ip];
|
||||
pHzi -= Psi_xp_Hz[ip];
|
||||
}int pml_yn_thickness = 8;
|
||||
|
||||
if ( y < pml_yn_thickness ) {
|
||||
const size_t ir = y; // index into pml parameters
|
||||
const size_t ip = z + x * sz + ir * sz * sx; // linear index into Psi
|
||||
Psi_yn_Hx[ip] = py0hn[ir] * Psi_yn_Hx[ip] + py1hn[ir] * dEzy;
|
||||
Psi_yn_Hz[ip] = py0hn[ir] * Psi_yn_Hz[ip] + py1hn[ir] * dExy;
|
||||
pHxi -= Psi_yn_Hx[ip];
|
||||
pHzi += Psi_yn_Hz[ip];
|
||||
}int pml_yp_thickness = 8;
|
||||
|
||||
if ( sy > y && y >= sy - pml_yp_thickness ) {
|
||||
const size_t ir = (sy - 1) - y; // index into pml parameters
|
||||
const size_t ip = z + x * sz + ir * sz * sx; // linear index into Psi
|
||||
Psi_yp_Hx[ip] = py0hp[ir] * Psi_yp_Hx[ip] + py1hp[ir] * dEzy;
|
||||
Psi_yp_Hz[ip] = py0hp[ir] * Psi_yp_Hz[ip] + py1hp[ir] * dExy;
|
||||
pHxi -= Psi_yp_Hx[ip];
|
||||
pHzi += Psi_yp_Hz[ip];
|
||||
}int pml_zn_thickness = 8;
|
||||
|
||||
if ( z < pml_zn_thickness ) {
|
||||
const size_t ir = z; // index into pml parameters
|
||||
const size_t ip = y + x * sy + ir * sy * sx; // linear index into Psi
|
||||
Psi_zn_Hx[ip] = pz0hn[ir] * Psi_zn_Hx[ip] + pz1hn[ir] * dEyz;
|
||||
Psi_zn_Hy[ip] = pz0hn[ir] * Psi_zn_Hy[ip] + pz1hn[ir] * dExz;
|
||||
pHxi += Psi_zn_Hx[ip];
|
||||
pHyi -= Psi_zn_Hy[ip];
|
||||
}int pml_zp_thickness = 8;
|
||||
|
||||
if ( sz > z && z >= sz - pml_zp_thickness ) {
|
||||
const size_t ir = (sz - 1) - z; // index into pml parameters
|
||||
const size_t ip = y + x * sy + ir * sy * sx; // linear index into Psi
|
||||
Psi_zp_Hx[ip] = pz0hp[ir] * Psi_zp_Hx[ip] + pz1hp[ir] * dEyz;
|
||||
Psi_zp_Hy[ip] = pz0hp[ir] * Psi_zp_Hy[ip] + pz1hp[ir] * dExz;
|
||||
pHxi += Psi_zp_Hx[ip];
|
||||
pHyi -= Psi_zp_Hy[ip];
|
||||
}
|
||||
|
||||
/*
|
||||
* Update H
|
||||
*/
|
||||
// Save old H for averaging
|
||||
ftype Hx_old = Hx[i];
|
||||
ftype Hy_old = Hy[i];
|
||||
ftype Hz_old = Hz[i];
|
||||
|
||||
// H update equations
|
||||
Hx[i] -= dt * (dEzy - dEyz + pHxi);
|
||||
Hy[i] -= dt * (dExz - dEzx + pHyi);
|
||||
Hz[i] -= dt * (dEyx - dExy + pHzi);
|
||||
|
||||
// Average H across timesteps
|
||||
ftype aHxt = Hx[i] + Hx_old;
|
||||
ftype aHyt = Hy[i] + Hy_old;
|
||||
ftype aHzt = Hz[i] + Hz_old;
|
||||
|
||||
/*
|
||||
* Calculate unscaled S components at H locations
|
||||
*/
|
||||
__global ftype *oSxy = oS + 0 * field_size;
|
||||
__global ftype *oSyz = oS + 1 * field_size;
|
||||
__global ftype *oSzx = oS + 2 * field_size;
|
||||
__global ftype *oSxz = oS + 3 * field_size;
|
||||
__global ftype *oSyx = oS + 4 * field_size;
|
||||
__global ftype *oSzy = oS + 5 * field_size;
|
||||
|
||||
oSxy[i] = aEyx * aHzt;
|
||||
oSxz[i] = -aEzx * aHyt;
|
||||
oSyz[i] = aEzy * aHxt;
|
||||
oSyx[i] = -aExy * aHzt;
|
||||
oSzx[i] = aExz * aHyt;
|
||||
oSzy[i] = -aEyz * aHxt;
|
||||
==========================================
|
||||
/*
|
||||
* Update E-field, including any PMLs.
|
||||
*
|
||||
* Template parameters:
|
||||
* common_header: Rendered contents of common.cl
|
||||
* pmls: [('x', 'n'), ('z', 'p'),...] list of pml axes and polarities
|
||||
* pml_thickness: Number of cells (integer)
|
||||
*
|
||||
* OpenCL args:
|
||||
* E, H, dt, S, oS
|
||||
*/
|
||||
|
||||
|
||||
|
||||
typedef float ftype;
|
||||
|
||||
|
||||
/*
|
||||
* Field size info
|
||||
*/
|
||||
const size_t sx = 395;
|
||||
const size_t sy = 345;
|
||||
const size_t sz = 73;
|
||||
const size_t field_size = sx * sy * sz;
|
||||
|
||||
//Since we use i to index into Ex[], Ey[], ... rather than E[], do nothing if
|
||||
// i is outside the bounds of Ex[].
|
||||
if (i >= field_size) {
|
||||
PYOPENCL_ELWISE_CONTINUE;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Array indexing
|
||||
*/
|
||||
// Given a linear index i and shape (sx, sy, sz), defines x, y, and z
|
||||
// as the 3D indices of the current element (i).
|
||||
// (ie, converts linear index [i] to field indices (x, y, z)
|
||||
const size_t x = i / (sz * sy);
|
||||
const size_t y = (i - x * sz * sy) / sz;
|
||||
const size_t z = (i - y * sz - x * sz * sy);
|
||||
|
||||
// Calculate linear index offsets corresponding to offsets in 3D
|
||||
// (ie, if E[i] <-> E(x, y, z), then E[i + diy] <-> E(x, y + 1, z)
|
||||
const size_t dix = sz * sy;
|
||||
const size_t diy = sz;
|
||||
const size_t diz = 1;
|
||||
|
||||
|
||||
/*
|
||||
* Pointer math
|
||||
*/
|
||||
//Pointer offsets into the components of a linearized vector-field
|
||||
// (eg. Hx = H + XX, where H and Hx are pointers)
|
||||
const size_t XX = 0;
|
||||
const size_t YY = field_size;
|
||||
const size_t ZZ = field_size * 2;
|
||||
|
||||
//Define pointers to vector components of each field (eg. Hx = H + XX)
|
||||
__global ftype *Ex = E + XX;
|
||||
__global ftype *Ey = E + YY;
|
||||
__global ftype *Ez = E + ZZ;
|
||||
|
||||
__global ftype *Hx = H + XX;
|
||||
__global ftype *Hy = H + YY;
|
||||
__global ftype *Hz = H + ZZ;
|
||||
|
||||
|
||||
/*
|
||||
* Implement periodic boundary conditions
|
||||
*
|
||||
* mx ([m]inus [x]) gives the index offset of the adjacent cell in the minus-x direction.
|
||||
* In the event that we start at x == 0, we actually want to wrap around and grab the cell
|
||||
* x_{-1} == (sx - 1) instead, ie. mx = (sx - 1) * dix .
|
||||
*
|
||||
* px ([p]lus [x]) gives the index offset of the adjacent cell in the plus-x direction.
|
||||
* In the event that we start at x == (sx - 1), we actually want to wrap around and grab
|
||||
* the cell x_{+1} == 0 instead, ie. px = -(sx - 1) * dix .
|
||||
*/
|
||||
|
||||
int mx = -dix;
|
||||
int px = +dix;
|
||||
int wrap_x = (sx - 1) * dix;
|
||||
if ( x == 0 ) {
|
||||
mx = wrap_x;
|
||||
} else if ( x == sx - 1 ) {
|
||||
px = -wrap_x;
|
||||
}
|
||||
|
||||
int my = -diy;
|
||||
int py = +diy;
|
||||
int wrap_y = (sy - 1) * diy;
|
||||
if ( y == 0 ) {
|
||||
my = wrap_y;
|
||||
} else if ( y == sy - 1 ) {
|
||||
py = -wrap_y;
|
||||
}
|
||||
|
||||
int mz = -diz;
|
||||
int pz = +diz;
|
||||
int wrap_z = (sz - 1) * diz;
|
||||
if ( z == 0 ) {
|
||||
mz = wrap_z;
|
||||
} else if ( z == sz - 1 ) {
|
||||
pz = -wrap_z;
|
||||
}
|
||||
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
|
||||
/*
|
||||
* Calculate S from oS (pre-calculated components)
|
||||
*/
|
||||
__global ftype *Sx = S + XX;
|
||||
__global ftype *Sy = S + YY;
|
||||
__global ftype *Sz = S + ZZ;
|
||||
|
||||
// Use unscaled S components from H locations
|
||||
__global ftype *oSxy = oS + 0 * field_size;
|
||||
__global ftype *oSyz = oS + 1 * field_size;
|
||||
__global ftype *oSzx = oS + 2 * field_size;
|
||||
__global ftype *oSxz = oS + 3 * field_size;
|
||||
__global ftype *oSyx = oS + 4 * field_size;
|
||||
__global ftype *oSzy = oS + 5 * field_size;
|
||||
|
||||
ftype s_factor = dt * 0.125;
|
||||
Sx[i] = (oSxy[i] + oSxz[i] + oSxy[i + my] + oSxz[i + mz]) * s_factor;
|
||||
Sy[i] = (oSyz[i] + oSyx[i] + oSyz[i + mz] + oSyx[i + mx]) * s_factor;
|
||||
Sz[i] = (oSzx[i] + oSzy[i] + oSzx[i + mx] + oSzy[i + my]) * s_factor;
|
||||
Loading…
x
Reference in New Issue
Block a user