diff options
| author | Thomas White <taw@physics.org> | 2010-02-27 23:21:36 +0100 |
|---|---|---|
| committer | Thomas White <taw@physics.org> | 2010-02-27 23:21:36 +0100 |
| commit | b02fbca84783eebae33a488905e0dcc13839745c (patch) | |
| tree | 09b3f2913e925cc66b0daa1f921edc32d39c98fc /data | |
| parent | 732af8778a49cacbfffe3c451125be84d7f86ee2 (diff) | |
Doesn't look like native_sin() works out here, sadly...
Diffstat (limited to 'data')
| -rw-r--r-- | data/diffraction.cl | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/data/diffraction.cl b/data/diffraction.cl index a401cdfa..ebacb416 100644 --- a/data/diffraction.cl +++ b/data/diffraction.cl @@ -71,9 +71,18 @@ float4 get_q(int x, int y, float cx, float cy, float res, float clen, float k, } +float range(float a) +{ + a = a >= 0.0 ? a : 2.0*M_PI + a; + a = a < 2.0*M_PI ? a : a - 2.0*M_PI; + + return a; +} + + float lattice_factor(float16 cell, float4 q, int4 ncells) { - float f1, f2, f3; + float f1, f2, f3, v; float4 Udotq; const int na = ncells.s0; const int nb = ncells.s1; @@ -84,13 +93,19 @@ float lattice_factor(float16 cell, float4 q, int4 ncells) Udotq.z = cell.s6*q.x + cell.s7*q.y + cell.s8*q.z; /* At exact Bragg condition, f1 = na */ - f1 = native_sin(M_PI*(float)na*Udotq.x) / native_sin(M_PI*Udotq.x); + v = M_PI*Udotq.x; + f1 = sin(v*(float)na) / sin(v); + f1 = isnan(f1) ? na : f1; /* At exact Bragg condition, f2 = nb */ - f2 = native_sin(M_PI*(float)nb*Udotq.y) / native_sin(M_PI*Udotq.y); + v = M_PI*Udotq.y; + f2 = sin(v*(float)nb) / sin(v); + f2 = isnan(f2) ? nb : f2; /* At exact Bragg condition, f3 = nc */ - f3 = native_sin(M_PI*(float)nc*Udotq.z) / native_sin(M_PI*Udotq.z); + v = M_PI*Udotq.z; + f3 = sin(v*(float)nc) / sin(v); + f3 = isnan(f3) ? nc : f3; /* At exact Bragg condition, this will multiply the molecular * part of the structure factor by the number of unit cells, |