uniform vec2 iResolution;
uniform float iTime;
// returns: [0.0, 1.0];
float random(float x) {
float r = fract(sin(x * 12.34) * 1234.5678);
return r;
}
void main() {
vec2 ratio = vec2(iResolution.x / iResolution.y, 1.0);
vec2 uv = gl_FragCoord.xy / iResolution.xy;
uv *= ratio;
float time = iTime * 0.75;
int particlesCount = 10;
float spawnDelta = 1.0 / float(particlesCount);
float size0 = 0.4;
float size1 = 0.0;
vec2 dir0 = vec2(0.3, 1.0);
vec2 dir1 = vec2(-0.3, 1.0);
vec3 color0 = vec3(1.0, 0.5, 0.0);
vec3 color1 = vec3(1.0, 0.0, 0.0);
vec3 result = vec3(0.0);
for (int i = 0; i < particlesCount; i++) {
float progress = fract(time + float(i) * spawnDelta);
