import { reglCanvas } from "@rreusser/regl-canvas"
viewof regl = reglCanvas(this, {
width: 512,
height: 512,
attributes: { antialias: true }
})
drawTriangle = regl({
vert: `
precision highp float;
attribute vec2 xy;
attribute vec3 color;
varying vec3 vColor;
void main () {
// Interpolate the color and send it to all rasterized fragments (pixels)
vColor = color;
// This is the main output of the vertex shader: where are the vertices?
gl_Position = vec4(xy, 0, 1);
}`,
frag: `
precision lowp float;
varying vec3 vColor;
void main () {
gl_FragColor = vec4(
// We can return values in the range [0, 1], it's good to get used to the
// fact that we generally do math on colors in a *linear* color space but
// then need (approximate) gamma correction to output colors in the *sRGB*
// color space.
pow(vColor, vec3(1.0 / 2.2)),
1
);
}`,
attributes: {
// These are the 2D coordinates of our triangle. The x- and y-coordinates of the
// canvas live in the range [-1, 1] x [-1, 1].
xy: [
[-0.5, -0.5],
[0.5, -0.5],
[0, 0.5]
],
// Similarly, we pass a color for each vertex.
color: [
[1, 0, 0],
[0, 1, 0],
[0, 0, 1]
]
},
primitive: "triangles",
count: 3,
// We're drawing in 2D so we won't use depth testing.
depth: { enable: false }
})
{
regl.poll();
regl.clear({ color: [0, 0, 0, 1] });
drawTriangle();
}
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