diff options
Diffstat (limited to 'aberth')
| -rw-r--r-- | aberth/aberth_kernel.fut | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/aberth/aberth_kernel.fut b/aberth/aberth_kernel.fut index 815c254..73a82ee 100644 --- a/aberth/aberth_kernel.fut +++ b/aberth/aberth_kernel.fut @@ -123,16 +123,19 @@ let derbyshire_at_index (index: i32): *poly = in tabulate PolyN (\i -> f64.i32 (i32.get_bit i bitfield * 2 - 1)) +let calc_index (value: f64) (left: f64) (right: f64) (steps: i32): i32 = + t64 ((value - left) / (right - left) * (r64 steps - 1) + 0.5) + let point_index (width: i32) (height: i32) (top_left: complex) (bottom_right: complex) (pt: complex) : i32 = - let x = (c64.re pt - c64.re top_left) / (c64.re bottom_right - c64.re top_left) - let y = (c64.im pt - c64.im top_left) / (c64.im bottom_right - c64.im top_left) - let xi = t64 (x * r64 (width - 1)) - let yi = t64 (y * r64 (height - 1)) - in width * yi + xi + let xi = calc_index (c64.re pt) (c64.re top_left) (c64.re bottom_right) width + let yi = calc_index (c64.im pt) (c64.im bottom_right) (c64.im top_left) height + in if 0 <= xi && xi < width && 0 <= yi && yi < height + then width * yi + xi + else -1 entry main_job (start_index: i32) (num_polys: i32) @@ -144,13 +147,13 @@ entry main_job let rng = rand_engine.rng_from_seed [seed] let top_left = c64.mk left top let bottom_right = c64.mk right bottom - let indices = flatten + let indices = filter (\i -> i != -1) (flatten (map (\idx -> let p = derbyshire_at_index idx let (_, pts) = aberth.aberth p rng let indices = map (point_index width height top_left bottom_right) pts in indices) - (start_index ..< start_index + num_polys)) + (start_index ..< start_index + num_polys))) in reduce_by_index (replicate (width * height) 0) (+) 0 indices (replicate (length indices) 1) entry main_all |