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Some final tweaks to the examples

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I promise
This commit is contained in:
dcodeIO
2018-04-20 18:56:51 +02:00
parent 4eade0f319
commit bde13b12cf
15 changed files with 2068 additions and 1487 deletions
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31
examples/mandelbrot/assembly/index.ts
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@ -13,30 +13,31 @@ export function computeLine(y: u32, width: u32, height: u32, limit: u32): void {
let real = (x - translateX) * scale;
// Iterate until either the escape radius or iteration limit is exceeded
let ix = 0.0, iy = 0.0, ixsq: f64, iysq: f64;
let ix = 0.0, iy = 0.0, ixSq: f64, iySq: f64;
let iteration: u32 = 0;
while ((ixsq = ix * ix) + (iysq = iy * iy) <= 4.0) {
let ix_new = ixsq - iysq + real;
while ((ixSq = ix * ix) + (iySq = iy * iy) <= 4.0) {
let ixNew = ixSq - iySq + real;
iy = 2.0 * ix * iy + imaginary;
ix = ix_new;
ix = ixNew;
if (iteration >= limit) break;
++iteration;
}
// Do a few extra iterations to reduce error margin
for (let i = 0; i < 5 && iteration < limit; ++i, ++iteration) {
let ix_new = ix * ix - iy * iy + real;
// Do a few extra iterations for quick escapes to reduce error margin
for (let minIterations = min(8, limit); iteration < minIterations; ++iteration) {
let ixNew = ix * ix - iy * iy + real;
iy = 2.0 * ix * iy + imaginary;
ix = ix_new;
ix = ixNew;
}
// Renormalize, see: http://linas.org/art-gallery/escape/escape.html
let frac: f64 = JSMath.log(JSMath.log(sqrt(ix * ix + iy * iy))) / JSMath.LN2;
store<u16>((y * width + x) << 1,
isFinite(frac)
? <u32>((NUM_COLORS - 1) * clamp((iteration + 1 - frac) / limit, 0.0, 1.0))
: (NUM_COLORS - 1) * iteration / limit
);
// Iteration count is a discrete value in the range [0, limit] here, but we'd like it to be
// normalized in the range [0, 2047] so it maps to the gradient computed in JS.
// see also: http://linas.org/art-gallery/escape/escape.html
let frac = Math.log(Math.log(Math.sqrt(ix * ix + iy * iy))) / Math.LN2;
let icol = isFinite(frac)
? <u32>((NUM_COLORS - 1) * clamp((iteration + 1 - frac) / limit, 0.0, 1.0))
: NUM_COLORS - 1;
store<u16>((y * width + x) << 1, icol);
}
}