Passing array straight to attributes about regl HOT 3 CLOSED

One problem with this proposal is that if you pass in an array to an attribute, then regl assumes that it is a constant attribute, as you would specify using using gl.vertexAttrib4f(..) for example. If we allow for array inputs, then this case is hard to disambiguate.

Also for dynamic attributes, then returning an array and converting it to a buffer each frame would cause serious performance problems. For example, you could write something like:

const drawMesh = regl({
   vert: `
    precision highp float;
    attribute vec2 position;
    void main() {
        gl_Position = vec4(position, 0, 1);
    }
    `,

    frag: `
    precision highp float;
    void main () {
        gl_FragColor = vec4(0,0,0, 1);
    }
    `,

    attributes: {
        position: regl.prop('position')
    },

   count: regl.prop('count')
})

If the position attribute is an array, then we'd have to keep track of a buffer reference internally for the draw call and use that to stream out the returned values.

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Still it is a pretty good idea, and something that would be nice to have if there is an unambiguous and efficient way to implement it.

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Thanks for the explanation, totally makes sense.
As far it is not an issue, I close it then.

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