@thi.ng/shader-ast-js/runtime.js

Customizable JS codegen, compiler & runtime for @thi.ng/shader-ast

import { clamp, clamp01 } from "@thi.ng/math/interval";
import { intBufferFromCanvas } from "@thi.ng/pixel/int";
const rgbaBgra8888 = (rgba) => clamp01(rgba[0]) * 255.5 << 0 | clamp01(rgba[1]) * 255.5 << 8 | clamp01(rgba[2]) * 255.5 << 16 | clamp01(rgba[3]) * 255.5 << 24;
const rgbaRgb565 = (rgba) => (clamp01(rgba[0]) * 255.5 & 248) << 8 | (clamp01(rgba[1]) * 255.5 & 252) << 3 | (clamp01(rgba[2]) * 255.5 & 248) >> 3;
const __clampCoord = (x, maxW, w) => w !== void 0 ? Math.min(x + w, maxW) : maxW;
const renderPixels = (fn, pixels, { x, y, w, h, bufW, bufH, offsetX, offsetY, imgH, fmt }) => {
  offsetX = offsetX || 0;
  offsetY = offsetY || 0;
  imgH = (imgH || bufH) - 1 - offsetY;
  x = clamp(x || 0, 0, bufW);
  y = clamp(y || 0, 0, bufH);
  const x2 = __clampCoord(x, bufW, w);
  const y2 = __clampCoord(y, bufH, h);
  const fragCoord = [];
  for (let yy = y; yy < y2; yy++) {
    fragCoord[1] = imgH - yy;
    let i = yy * bufW + x;
    for (let xx = x; xx < x2; xx++) {
      fragCoord[0] = xx + offsetX;
      pixels[i++] = fmt(fn(fragCoord));
    }
  }
  return pixels;
};
const renderBuffer = (fn, buf, opts) => {
  renderPixels(fn, buf.data, {
    fmt: rgbaBgra8888,
    bufW: buf.width,
    bufH: buf.height,
    x: 0,
    y: 0,
    ...opts
  });
  return buf;
};
const canvasRenderer = (canvas) => {
  const buf = intBufferFromCanvas(canvas);
  const data = new ImageData(canvas.width, canvas.height);
  return (fn, x = 0, y = 0, w = canvas.width, h = canvas.height) => {
    renderBuffer(fn, buf, { x, y, w, h });
    buf.blitCanvas(canvas, { data });
  };
};
export {
  canvasRenderer,
  renderBuffer,
  renderPixels,
  rgbaBgra8888,
  rgbaRgb565
};