in sketch.p5.js [164:175]
function applyRenderOptions(p, options, index) {
var layerBlendMode = options.blendMode;
if (layerBlendMode) {
//console.log('apply blend mode', index, layerBlendMode, BLEND_TO_P5[layerBlendMode]);
p.blendMode(p[BLEND_TO_P5[layerBlendMode]]);
} else {
//console.log('apply blend mode', index, '', 'NORMAL');
p.blendMode(p.NORMAL);
}
//p.opacity(options.opacity);
ctx.globalAlpha = options.opacity;
}