WebGL Shader Manager v3 - Alle Uniforms

✎ Galaxy Spiral

Bereit

Vertex Shader

attribute vec2 a_position;
void main() {
    gl_Position = vec4(a_position, 0.0, 1.0);
}

Fragment Shader

precision mediump float;
uniform float u_time;
uniform vec2 u_resolution;
uniform vec2 u_mouseNorm;
uniform float u_zoom;

float hash(float n) { return fract(sin(n) * 43758.5453123); }

void main() {
    vec2 uv = (gl_FragCoord.xy - 0.5 * u_resolution.xy) / u_resolution.y;
    uv /= u_zoom;
    float t = u_time * 0.1;
    float angle = atan(uv.y, uv.x);
    float radius = length(uv);
    float spiral = sin(angle * 3.0 + radius * 8.0 - t * 5.0);
    float arms = smoothstep(0.3, 0.7, spiral) * exp(-radius * 1.5);
    vec3 core = vec3(1.0, 0.9, 0.7) * exp(-radius * 4.0);
    vec3 armCol = vec3(0.3, 0.5, 0.9) * arms;
    vec3 starCol = vec3(0.0);
    for (float i = 0.0; i < 50.0; i++) {
        float a = hash(i) * 6.2831 + t * (0.1 + hash(i + 100.0) * 0.3);
        float r = hash(i + 50.0) * 1.5;
        vec2 starPos = vec2(cos(a), sin(a)) * r;
        float star = smoothstep(0.02, 0.0, length(uv - starPos));
        starCol += vec3(0.8 + hash(i)*0.2, 0.8, 1.0) * star;
    }
    vec3 col = core + armCol + starCol * 0.3;
    float mouseDist = length(uv - (u_mouseNorm - 0.5) * vec2(u_resolution.x/u_resolution.y, 1.0) / u_zoom);
    col += vec3(1.0, 0.8, 0.5) * smoothstep(0.15, 0.0, mouseDist) * 0.5;
    gl_FragColor = vec4(col, 1.0);
}

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