uniform sampler2D SCREEN_TEXTURE;
uniform highp vec2 renderScale;
uniform lowp int count;
uniform highp vec2[10] position;
uniform highp float[10] sharpness;
uniform highp float[10] width;
uniform highp float[10] falloffPower;

void fragment() {
    highp vec2 coord = FRAGCOORD.xy * SCREEN_PIXEL_SIZE.xy;
    highp float ratio = SCREEN_PIXEL_SIZE.y / SCREEN_PIXEL_SIZE.x * 0.6;

    for (int i = 0; i < count; ++i) {
        highp vec2 WaveCentre = position[i];

        highp float Dist = distance(
            vec2(coord.x, coord.y * ratio),
            vec2(WaveCentre.x, WaveCentre.y * ratio)
        );

        // removes the first few frames of the "animation"
        Dist = max(Dist, 0.13);

        highp float offset = (TIME - floor(TIME)) / TIME;
        highp float CurrentTime = TIME * offset;

        if (Dist <= (CurrentTime + 0.1) && Dist >= (CurrentTime - 0.1)) {
            highp float Diff = Dist - CurrentTime;
            highp float ScaleDiff = 1.0 - pow(abs(Diff * sharpness[i]), width[i]);
            highp float DiffTime = Diff * ScaleDiff;
            highp vec2 DiffTexCoord = normalize(coord - WaveCentre);
            coord += (DiffTexCoord * DiffTime) / (CurrentTime * Dist * falloffPower[i]);
            highp vec4 Color = zTextureSpec(SCREEN_TEXTURE, coord);
            Color += (Color * ScaleDiff) / (CurrentTime * Dist * 40.0);
            COLOR = Color;
        } else {
            COLOR = zTextureSpec(SCREEN_TEXTURE, UV);
        }
    }
}