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Update simd-mandelbrot.js to align with new simd spec #46

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Update simd-mandelbrot.js to align with new simd spec #46

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31 changes: 9 additions & 22 deletions simd-mandelbrot/mandelbrot-worker.js
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Original file line number Diff line number Diff line change
Expand Up @@ -49,40 +49,27 @@ function mandelx4(c_re4, c_im4) {
var four4 = SIMD.Float32x4.splat (4.0);
var two4 = SIMD.Float32x4.splat (2.0);
var count4 = SIMD.Int32x4.splat (0);
var zero4 = SIMD.Int32x4.splat (0);
var one4 = SIMD.Int32x4.splat (1);

for (var i = 0; i < max_iterations; ++i) {
var z_re24 = SIMD.Float32x4.mul (z_re4, z_re4);
var z_im24 = SIMD.Float32x4.mul (z_im4, z_im4);

var mi4Tmp = SIMD.Float32x4.lessThanOrEqual (SIMD.Float32x4.add (z_re24, z_im24), four4);
var mb4 = SIMD.Float32x4.lessThanOrEqual (SIMD.Float32x4.add (z_re24, z_im24), four4);
// if all 4 values are greater than 4.0, there's no reason to continue
if(!SIMD.Bool32x4.anyTrue(mi4Tmp)) {
if (!SIMD.Bool32x4.allTrue(mb4)) {
break;
}

var mi4 = SIMD.Int32x4.splat(4);
for(var j=0; j < 4; j++) {
switch (SIMD.Bool32x4.extractLane(mi4Tmp, j)) {
case true:
mi4 = SIMD.Int32x4.replaceLane(mi4, j, -1);
break;
case false:
mi4 = SIMD.Int32x4.replaceLane(mi4, j, 0);
break;
default:
return false;
break;
}
}

var new_re4 = SIMD.Float32x4.sub (z_re24, z_im24);
var new_im4 = SIMD.Float32x4.mul (SIMD.Float32x4.mul (two4, z_re4), z_im4);
z_re4 = SIMD.Float32x4.add (c_re4, new_re4);
z_im4 = SIMD.Float32x4.add (c_im4, new_im4);
count4 = SIMD.Int32x4.add (count4, SIMD.Int32x4.and (mi4, one4));
var new_re4 = SIMD.Float32x4.sub(z_re24, z_im24);
var new_im4 = SIMD.Float32x4.mul(SIMD.Float32x4.mul (two4, z_re4), z_im4);
z_re4 = SIMD.Float32x4.add(c_re4, new_re4);
z_im4 = SIMD.Float32x4.add(c_im4, new_im4);
count4 = SIMD.Int32x4.add(count4, SIMD.Int32x4.select(mb4, one4, zero4));
}
return count4;

}

function mapColorAndSetPixel (x, y, value) {
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