// Copyright 2018 Google Inc.
precision mediump float;
uniform sampler2D u_MainTex;
uniform vec4 u_time;
varying vec4 v_color;
varying vec2 v_texcoord0;
varying vec4 v_unbloomedColor;
vec4 GetRainbowColor(vec2 texcoord)
{
vec4 _Time = u_time;
texcoord = clamp(texcoord, 0.0, 1.0);
vec2 uvs = texcoord;
float row_id = floor(uvs.y * 5.0);
uvs.y *= 5.0;
vec4 tex = vec4(0.0, 0.0, 0.0, 1.0);
float row_y = mod(uvs.y, 1.0);
row_id = ceil(mod(row_id + _Time.z, 5.0)) - 1.0;
tex.rgb = row_id == 0.0 ? vec3(1.0, 0.0, 0.0) : tex.rgb;
tex.rgb = row_id == 1.0 ? vec3(.7, .3, 0.0) : tex.rgb;
tex.rgb = row_id == 2.0 ? vec3(0.0, 1.0, .0) : tex.rgb;
tex.rgb = row_id == 3.0 ? vec3(0.0, .2, 1.0) : tex.rgb;
tex.rgb = row_id == 4.0 ? vec3(.4, 0.0, 1.2) : tex.rgb;
tex.rgb *= pow((sin(row_id * 1.0 + _Time.z) + 1.0) / 2.0, 5.0);
tex.rgb *= clamp(pow(row_y * (1.0 - row_y) * 5.0, 50.0), 0.0, 1.0);
return tex;
}
vec4 GetWaveForm(vec2 texcoord){
vec4 _Time = u_time;
float envelope = sin(texcoord.x * 3.14159);
float waveform = .15 * sin(-30. * v_unbloomedColor.r * _Time.w + texcoord.x * 100. * v_unbloomedColor.r);
waveform += .15 * sin(-40. * v_unbloomedColor.g * _Time.w + texcoord.x * 100. * v_unbloomedColor.g);
waveform += .15 * sin(-50. * v_unbloomedColor.b * _Time.w + texcoord.x * 100. * v_unbloomedColor.b);
float pinch = (1. - envelope) * 40. + 20.;
float procedural_line = clamp(1. - pinch*abs(texcoord.y - .5 - waveform * envelope), 0., 1.);
vec4 color = vec4(1.);
color.rgb *= envelope * procedural_line;
color = v_color * color;
return color;
}
void main() {
gl_FragColor = GetWaveForm(v_texcoord0.xy);
}