Shaders can inject parameters into other shaders

[xian]

In the example below, imageA and imageB both become color input ports; for whatever is wired to those ports, any uv-coordinate input port will be satisfied with the value passed to the corresponding function.

// @return color
// @param uv uv-coordinate
vec4 imageA(vec2 uv);

// @return color
// @param uv uv-coordinate
vec4 imageB(vec2 uv);

// @return color
// @param position uv-coordinate
vec4 main(vec2 uv, float progress) {
    if (uv.x < progress) {
        return imageA(vec2(uv.x - 1. + progress, uv.y));
    } else {
        return imageB(vec2(uv.x + progress, uv.y));
    }
}

This could, e.g. be used to create an effect where one image slides off to one side as another slides in from the other.

[xian]

Oops, this was implemented in #352.