// Copyright 2018 Google Inc.
precision mediump float;
uniform float u_EmissionGain;
uniform sampler2D u_MainTex;
uniform vec4 u_time;
varying vec4 v_color;
varying vec2 v_texcoord0;
vec4 bloomColor(vec4 color, float gain) {
float cmin = length(color.rgb) * .05;
color.rgb = max(color.rgb, vec3(cmin, cmin, cmin));
color.r = pow(color.r, 2.2);
color.g = pow(color.g, 2.2);
color.b = pow(color.b, 2.2);
color.a = pow(color.a, 2.2);
color.rgb *= 2.0 * exp(gain * 10.0);
return color;
}
void main() {
vec4 unbloomedColor = v_color;
vec4 bloomedColor = bloomColor(v_color, u_EmissionGain);
vec2 texcoord = v_texcoord0.xy;
float envelope = sin(texcoord.x * 3.14159);
texcoord.y += texcoord.x * 3.0;
float waveform_r = .15 * sin( -20.0 * unbloomedColor.r * u_time.w + texcoord.x * 100.0 * unbloomedColor.r);
float waveform_g = .15 * sin( -30.0 * unbloomedColor.g * u_time.w + texcoord.x * 100.0 * unbloomedColor.g);
float waveform_b = .15 * sin( -40.0 * unbloomedColor.b * u_time.w + texcoord.x * 100.0 * unbloomedColor.b);
texcoord.y = mod(texcoord.y + texcoord.x, 1.0);
texcoord.y = mod(texcoord.y + texcoord.x, 1.0);
float procedural_line_r = clamp(1.0 - 40.0*abs(texcoord.y - .5 + waveform_r),0.0,1.0);
float procedural_line_g = clamp(1.0 - 40.0*abs(texcoord.y - .5 + waveform_g),0.0,1.0);
float procedural_line_b = clamp(1.0 - 40.0*abs(texcoord.y - .5 + waveform_b),0.0,1.0);
vec4 color = procedural_line_r * vec4(1.0,0.0,0.0,0.0) + procedural_line_g * vec4(0.0,1.0,0.0,0.0) + procedural_line_b * vec4(0.0,0.0,1.0,0.0);
color.w = 1.0;
color = bloomedColor * color;
gl_FragColor = vec4(color.rgb * color.a, 1.0);
}