Hello, regl!regl-canvasInstanced WebGL CirclesDrawing Instanced Lines with reglRegl Color Scale SelectorContour Plots with regl Observable PlotSelecting the Right Opacity for 2D Point CloudsSDF Points with reglAdaptive Contouring in Fragment ShadersStrange Attractors on the GPU, Part 1: ImplementationFake Transparency for 3D SurfacesBicubic Texture Interpolation using Linear Filtering
Observable Plot + regl
viewof layers = elementStack(this, {
width: Math.min(width, 400),
height: Math.min(width, 400),
layers: {
regl: ({ current, width, height }) =>
reglCanvas(current, { width, height }),
plot: ({ width, height }) =>
Plot.plot({
width,
style: { backgroundColor: "transparent", maxWidth: "none" },
aspectRatio: 1,
x: { grid: true, domain: [-1, 1] },
y: { grid: true, domain: [-1, 1] },
marks: [
Plot.frame(),
Plot.ruleY([0]),
Plot.ruleX([0]),
Plot.line(
[
[-0.5, -0.5],
[0.5, -0.5],
[0, 0.5],
[-0.5, -0.5]
],
{ strokeWidth: 4 }
)
]
})
}
})
regl = layers.regl.value
configureAxes = createAxisConfiguration(regl)
{
const xaxis = layers.plot.scale("x");
const yaxis = layers.plot.scale("y");
regl.poll();
configureAxes(xaxis, yaxis, () => {
drawTriangle();
});
}
drawTriangle = regl({
vert: `
precision highp float;
attribute vec2 xy;
attribute vec3 color;
uniform mat4 view;
varying vec3 vColor;
void main () {
vColor = color;
gl_Position = view * vec4(xy, 0, 1);
}`,
frag: `
precision lowp float;
varying vec3 vColor;
void main () {
gl_FragColor = vec4(pow(vColor, vec3(1.0 / 2.2)), 1);
}`,
attributes: {
xy: [-0.5, -0.5, 0.5, -0.5, 0, 0.5],
color: [
[1, 0, 0],
[0, 1, 0],
[0, 0, 1]
]
},
primitive: "triangles",
count: 3,
depth: { enable: false }
})
function elementStack(
currentStack,
{ width = null, height = null, layers = {}, onResize = null } = {}
) {
const container = currentStack || document.createElement("figure");
container.style.position = "relative";
if (!currentStack && onResize) {
const observer = new ResizeObserver(([{ contentRect }]) => {
onResize({ layers: container.value, rect: contentRect });
container.dispatchEvent(new CustomEvent("input"));
});
observer.observe(container);
}
const stack = {};
let defaultZindex = 0;
for (const [label, props] of Object.entries(layers)) {
const layer = typeof props === "function" ? props : props.layer;
const id = `element-stack-layer-${label}`;
const current = container.querySelector(`#${id}`);
const newEl = layer({ current, width, height });
newEl.setAttribute("id", id);
if (!newEl.style.position) newEl.style.position = "absolute";
stack[label] = newEl;
if (current) {
current.replaceWith(newEl);
} else {
container.appendChild(newEl);
}
}
if (width) container.style.width = `${width}px`;
if (height) container.style.height = `${height}px`;
container.value = stack;
return container;
}
import { mat4create, mat4ortho, mat4invert } from "@rreusser/gl-mat4"
function createAxisConfiguration(regl) {
const configureAxes = regl({
uniforms: {
view: regl.prop("view"),
viewInverse: regl.prop("viewInverse")
},
context: {
view: regl.prop("view"),
viewInverse: regl.prop("viewInverse")
},
scissor: {
enable: true,
box: {
x: ({ pixelRatio }, { xRange: [xmin, xmax] }) => xmin * pixelRatio,
y: ({ pixelRatio, framebufferHeight }, { yRange: [ymax, ymin] }) =>
framebufferHeight - ymax * pixelRatio,
width: ({ pixelRatio }, { xRange: [xmin, xmax] }) =>
(xmax - xmin) * pixelRatio,
height: ({ pixelRatio }, { yRange: [ymax, ymin] }) =>
(ymax - ymin) * pixelRatio
}
},
viewport: {
x: ({ pixelRatio }, { xRange: [xmin, xmax] }) => xmin * pixelRatio,
y: ({ pixelRatio, framebufferHeight }, { yRange: [ymax, ymin] }) =>
framebufferHeight - ymax * pixelRatio,
width: ({ pixelRatio }, { xRange: [xmin, xmax] }) =>
(xmax - xmin) * pixelRatio,
height: ({ pixelRatio }, { yRange: [ymax, ymin] }) =>
(ymax - ymin) * pixelRatio
}
});
const view = mat4create();
const viewInverse = mat4create();
return function (xScale, yScale, callback) {
mat4ortho(view, ...xScale.domain, ...yScale.domain, -1, 1);
mat4invert(viewInverse, view);
configureAxes(
{ view, viewInverse, xRange: xScale.range, yRange: yScale.range },
callback
);
};
}
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