1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
__constant float tau = ${tau};
bool is_in_circle(float x, float y, float a, float b, float r) {
return sqrt(pow(x-a,2)+pow(y-b,2)) < r;
}
__kernel void equilibrilize(__global __write_only float* f_a,
__global __write_only float* f_b)
{
const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
__global __write_only float* preshifted_f_a = f_a + gid;
__global __write_only float* preshifted_f_b = f_b + gid;
if ( is_in_circle(get_global_id(0), get_global_id(1), ${nX//4}, ${nY//4}, ${nX//10})
|| is_in_circle(get_global_id(0), get_global_id(1), ${nX//4}, ${nY-nY//4}, ${nX//10})
|| is_in_circle(get_global_id(0), get_global_id(1), ${nX-nX//4}, ${nY//4}, ${nX//10})
|| is_in_circle(get_global_id(0), get_global_id(1), ${nX-nX//4}, ${nY-nY//4}, ${nX//10}) ) {
% for i, w_i in enumerate(w):
preshifted_f_a[${i*nCells}] = 1./24.f;
preshifted_f_b[${i*nCells}] = 1./24.f;
% endfor
} else {
% for i, w_i in enumerate(w):
preshifted_f_a[${i*nCells}] = ${w_i}.f;
preshifted_f_b[${i*nCells}] = ${w_i}.f;
% endfor
}
}
<%
def direction_index(c_i):
return (c_i[0]+1) + 3*(1-c_i[1])
def neighbor_offset(c_i):
if c_i[1] == 0:
return c_i[0]
else:
return c_i[1]*nX + c_i[0]
%>
__kernel void collide_and_stream(__global __write_only float* f_a,
__global __read_only float* f_b,
__global __read_only int* material)
{
const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
const int m = material[gid];
if ( m == 0 ) {
return;
}
__global __write_only float* preshifted_f_a = f_a + gid;
__global __read_only float* preshifted_f_b = f_b + gid;
% for i, c_i in enumerate(c):
const float f_curr_${i} = preshifted_f_b[${direction_index(c_i)*nCells + neighbor_offset(-c_i)}];
% endfor
% for i, expr in enumerate(moments_helper):
const float ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(moments_assignment):
float ${ccode(expr)}
% endfor
if ( m == 2 ) {
u_0 = 0.0;
u_1 = 0.0;
}
% for i, expr in enumerate(collide_helper):
const float ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(collide_assignment):
const float ${ccode(expr)}
% endfor
% for i in range(0,len(c)):
preshifted_f_a[${i*nCells}] = f_next_${i};
% endfor
}
__kernel void collect_moments(__global __read_only float* f,
__global __write_only float* moments)
{
const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
__global __read_only float* preshifted_f = f + gid;
% for i in range(0,len(c)):
const float f_curr_${i} = preshifted_f[${i*nCells}];
% endfor
% for i, expr in enumerate(moments_helper):
const float ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(moments_assignment):
moments[${i*nCells} + gid] = ${ccode(expr.rhs)};
% endfor
}
|
