#version 100
// HMS MediaEngine - Generator (GLES, Raspberry Pi)
// ES 2.0: texture2D, varying, gl_FragColor, Schleifen mit konstanter Höchstgrenze.
precision mediump float;

uniform sampler2D u_input_texture;
uniform vec2  u_resolution;
uniform float u_time_seconds;
uniform float u_delta_seconds;
uniform float u_frame_index;
uniform float u_layer_opacity;
uniform float u_audio_rms;
uniform float u_audio_peak;
uniform float u_audio_bass;
uniform float u_audio_mid;
uniform float u_audio_treble;
uniform float u_audio_beat;
uniform vec4  param_color_a;
uniform vec4  param_color_b;
uniform float param_type;
uniform float param_angle;
uniform float param_center_x;
uniform float param_center_y;
uniform float param_width;
uniform float param_phase;
uniform float param_speed;


varying vec2 v_uv;

void main()
{
    vec2 p = v_uv - vec2(param_center_x, param_center_y);
    float ang = radians(param_angle);
    vec2 dir = vec2(cos(ang), sin(ang));
    float t;
    if (param_type < 0.5)
    {
        t = dot(p, dir) / max(param_width, 0.0001) + 0.5;
    }
    else
    {
        t = length(p) / max(param_width, 0.0001);
    }
    t += param_phase + u_time_seconds * param_speed;
    t = fract(t);
    vec4 col = mix(param_color_a, param_color_b, clamp(t, 0.0, 1.0));
    col.a *= u_layer_opacity;
    gl_FragColor = col;
}