Sha256: 4413367257c55ef68d26e23d6c4c5c187796bcb4cede3a464b62fca511948f06
Contents?: true
Size: 1.88 KB
Versions: 11
Compression:
Stored size: 1.88 KB
Contents
uniform float u_glowLengthTS;
uniform float u_radiusTS;
varying vec2 v_textureCoordinates;
vec2 rotate(vec2 p, vec2 direction)
{
return vec2(p.x * direction.x - p.y * direction.y, p.x * direction.y + p.y * direction.x);
}
vec4 addBurst(vec2 position, vec2 direction)
{
vec2 rotatedPosition = rotate(position, direction) * vec2(25.0, 0.75);
float radius = length(rotatedPosition);
float burst = 1.0 - smoothstep(0.0, 0.55, radius);
return vec4(burst);
}
void main()
{
vec2 position = v_textureCoordinates - vec2(0.5);
float radius = length(position);
float surface = step(radius, u_radiusTS);
vec4 color = vec4(1.0, 1.0, surface + 0.2, surface);
float glow = 1.0 - smoothstep(0.0, 0.55, radius);
color.ba += mix(vec2(0.0), vec2(1.0), glow) * 0.75;
vec4 burst = vec4(0.0);
// The following loop has been manually unrolled for speed, to
// avoid sin() and cos().
//
//for (float i = 0.4; i < 3.2; i += 1.047) {
// vec2 direction = vec2(sin(i), cos(i));
// burst += 0.4 * addBurst(position, direction);
//
// direction = vec2(sin(i - 0.08), cos(i - 0.08));
// burst += 0.3 * addBurst(position, direction);
//}
burst += 0.4 * addBurst(position, vec2(0.38942, 0.92106)); // angle == 0.4
burst += 0.4 * addBurst(position, vec2(0.99235, 0.12348)); // angle == 0.4 + 1.047
burst += 0.4 * addBurst(position, vec2(0.60327, -0.79754)); // angle == 0.4 + 1.047 * 2.0
burst += 0.3 * addBurst(position, vec2(0.31457, 0.94924)); // angle == 0.4 - 0.08
burst += 0.3 * addBurst(position, vec2(0.97931, 0.20239)); // angle == 0.4 + 1.047 - 0.08
burst += 0.3 * addBurst(position, vec2(0.66507, -0.74678)); // angle == 0.4 + 1.047 * 2.0 - 0.08
// End of manual loop unrolling.
color += clamp(burst, vec4(0.0), vec4(1.0)) * 0.15;
gl_FragColor = clamp(color, vec4(0.0), vec4(1.0));
}
Version data entries
11 entries across 11 versions & 1 rubygems