forked from jan/opencl_fdtd
jan
d34c478f1d
- Move to jinja2 templates for the opencl code - Combine PML code into the E, H updates for speed - Add Poynting vector calculation code, including precalculation during H update - Use arrays for PML parameters (p0, p1) - Switch to linearized, C-ordered fields (~50% performance boost??) - Added jinja2 and fdfd_tools dependencies
79 lines
2.0 KiB
Common Lisp
79 lines
2.0 KiB
Common Lisp
/*
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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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{{common_header}}
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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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{% 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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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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{% 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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Ex[i] += dt / epsx[i] * (dHzy - dHyz + pExi);
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Ey[i] += dt / epsy[i] * (dHxz - dHzx + pEyi);
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Ez[i] += dt / epsz[i] * (dHyx - dHxy + pEzi);
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