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__kernel void equilibrilize(__global __write_only float* f_next,
__global __write_only float* f_prev)
{
const unsigned int gid = get_global_id(1)*${geometry.size_x} + get_global_id(0);
__global __write_only float* preshifted_f_next = f_next + gid;
__global __write_only float* preshifted_f_prev = f_prev + gid;
% if pop_eq_src == '':
% for i, w_i in enumerate(descriptor.w):
preshifted_f_next[${i*geometry.volume}] = ${w_i}.f;
preshifted_f_prev[${i*geometry.volume}] = ${w_i}.f;
% endfor
% else:
${pop_eq_src}
% endif
}
<%
def direction_index(c_i):
return (c_i[0]+1) + 3*(1-c_i[1])
def neighbor_offset(c_i):
if c_i[1] == 0:
return c_i[0]
else:
return c_i[1]*geometry.size_x + c_i[0]
%>
__kernel void collide_and_stream(__global __write_only float* f_next,
__global __read_only float* f_prev,
__global __read_only int* material)
{
const unsigned int gid = get_global_id(1)*${geometry.size_x} + get_global_id(0);
const int m = material[gid];
if ( m == 0 ) {
return;
}
__global __write_only float* preshifted_f_next = f_next + gid;
__global __read_only float* preshifted_f_prev = f_prev + gid;
% for i, c_i in enumerate(descriptor.c):
const float f_curr_${i} = preshifted_f_prev[${direction_index(c_i)*geometry.volume + neighbor_offset(-c_i)}];
% endfor
% for i, expr in enumerate(moments_subexpr):
const float ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(moments_assignment):
float ${ccode(expr)}
% endfor
${boundary_src}
% for i, expr in enumerate(collide_subexpr):
const float ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(collide_assignment):
const float ${ccode(expr)}
% endfor
% for i in range(0,descriptor.q):
preshifted_f_next[${i*geometry.volume}] = f_next_${i};
% endfor
}
__kernel void collect_moments(__global __read_only float* f,
__global __write_only float* moments)
{
const unsigned int gid = get_global_id(1)*${geometry.size_x} + get_global_id(0);
__global __read_only float* preshifted_f = f + gid;
% for i in range(0,descriptor.q):
const float f_curr_${i} = preshifted_f[${i*geometry.volume}];
% endfor
% for i, expr in enumerate(moments_subexpr):
const float ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(moments_assignment):
moments[${i*geometry.volume} + gid] = ${ccode(expr.rhs)};
% endfor
}
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