kodelife-image-animation.glsl

#version 150

uniform float time;
uniform vec2 resolution;
uniform sampler2D bitmoji;

in VertexData
{
    vec4 v_position;
    vec3 v_normal;
    vec2 v_texcoord;
} inData;

out vec4 fragColor;

vec2 dance(float time, vec2 uv, vec2 point, vec2 offset) {
    int animSteps = 60;
    float animDist = 0.003;
    vec2 diff = abs(uv - point);
    vec2 value = vec2(0.);
    for(int i = 0; i < animSteps; i++) {
        if (diff.y < i*animDist) {
            value.x += offset.x*time;
        }
        if (diff.x < i*animDist) {
            value.y += offset.y*time;
        }
    }
    return value;
}

void main(void)
{
    vec2 uv = inData.v_texcoord;
    vec2 img = vec2(uv.x, 1-uv.y);

    img += dance(sin(time*4)/4, uv, vec2(0.5, 0.7), vec2(0., 0.0002));
    img += dance(sin(time*8),   uv, vec2(0.5, 0.3), vec2(0.0003, 0.));
    img += dance(cos(time*16),  uv, vec2(0.5, 0.),  vec2(0., 0.0001));

    fragColor = texture(bitmoji, img);
}