regl-aware deep extend
Implements deep extend with an explicitly permitted list of regl attributes so that it can avoid recursing into opaque regl resources. Perhaps makes regl templates more suitable for reuse and public consumption. Pushes around keys and values and has no dependency on regl itself.
If you find missing attributes, please open an issue!
$ npm install regl-extendThe example below illustrates using regl-extend to create a template that maps one framebuffer to another.
var regl = require('regl')
var extendCommand = require('regl-extend').command
var createMap = opts => regl(extendCommand({
vert: `
precision mediump float;
attribute vec2 xy;
varying vec2 uv;
void main () {
uv = 0.5 * (1.0 + xy);
gl_Position = vec4(xy, 0, 1);
}
`,
attributes: {xy: [[-4, -4], [0, 4], [4, -4]]},
depth: {enable: false},
count: 3
}, opts))Then use the template by specifying attributes that differ:
createMap({
frag: `
precision mediump float;
varying vec2 uv;
uniform sampler2D src;
void main () {
gl_FragColor = texture2D(src, uv);
}
`,
uniforms: {src: regl.prop('src')}
})
// => regl({
// vert: `
// precision mediump float;
// attribute vec2 xy;
// varying vec2 uv;
// void main () {
// uv = 0.5 * (1.0 + xy);
// gl_Position = vec4(xy, 0, 1);
// }
// `,
// frag: `
// precision mediump float;
// varying vec2 uv;
// uniform sampler2D src;
// void main () {
// gl_FragColor = texture2D(src, uv);
// }
// `,
// attributes: {xy: [[-4, -4], [0, 4], [4, -4]]},
// uniforms: {src: regl.prop('src')}
// depth: {enable: false},
// count: 3
// })Extend commands are implemented for each type of regl resource. Each method extends the attributes of a sequence of arguments, returning a new object with the merged contents. The values of any valid properties for that command are transferred. The recursion stops at data values like a regl resource or a bare array. Each successive object provided overwrites existing properties of the result. Unknown properties are ignored.
© 2017 Ricky Reusser. MIT License.
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