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70 lines
2.2 KiB
70 lines
2.2 KiB
// shaders/dialog_wave_core.frag
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#version 300 es
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precision highp float;
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#include <flutter/runtime_effect.glsl>
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uniform vec2 u_resolution; // setFloat(0, w) & (1, h)
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uniform float u_time; // setFloat(2, t)
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uniform float u_amp; // setFloat(3, amp) —— 建议传音量 RMS
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out vec4 fragColor;
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// ─────────── Noise Helpers ───────────
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float hash(vec2 p){return fract(sin(dot(p,vec2(127.1,311.7)))*43758.545);}
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float noise(vec2 p){
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vec2 i=floor(p), f=fract(p);
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vec2 u=f*f*(3.0-2.0*f);
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return mix(
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mix(hash(i), hash(i+vec2(1,0)),u.x),
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mix(hash(i+vec2(0,1)), hash(i+vec2(1,1)),u.x),u.y);
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}
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float fbm(vec2 p){
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float a=.5, v=0.;
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mat2 m=mat2(1.6,1.2,-1.2,1.6);
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for(int i=0;i<3;i++){
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v+=a*noise(p); p=m*p*1.6; a*=.55;
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}
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return v;
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}
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// ─────────── Palette ───────────
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vec3 palette(float t){
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vec3 deep = vec3(0.05,0.10,0.30); // 靛蓝
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vec3 mid = vec3(0.15,0.00,0.55); // 暗紫
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vec3 glow = vec3(0.00,0.60,1.00); // 电蓝
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return mix(deep, mix(mid, glow, t*t), t); // t² 让亮部偏蓝
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}
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void main(){
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// ① 归一化到 [-1,1]（保持比例）
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vec2 uv = (FlutterFragCoord().xy / u_resolution)*2.0 - 1.0;
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uv.x *= u_resolution.x / u_resolution.y;
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float r = length(uv); // 半径 0~√2
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// ② “呼吸”——音量驱动整体缩放（amp ∈ [0,1]）
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float breath = 1.0 - (.08 + .05*u_amp) * sin(u_time*1.5);
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vec2 p = uv / breath; // 越大越收缩
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p *= 3.0; // 纹理密度
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p += u_time * 0.35; // 缓慢横移
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// ③ 旋转扭曲 + fBm 云雾
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float angle = atan(p.y,p.x) + 0.25*r; // 小角度漩涡
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float radius = length(p);
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vec2 q = vec2(cos(angle),sin(angle))*radius;
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float n = fbm(q) * .7 + fbm(q*2.0) * .3;
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n = smoothstep(.3,.7,n);
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vec3 col = palette(n);
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// ④ 亮度脉冲（随 amp 加强）
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col += (.05 + .08*u_amp) * sin(u_time*2.0 + n*6.0);
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// ⑤ 外环光晕（amp 加深）
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float halo = smoothstep(.55,.05,r) * (0.15 + 0.5*u_amp);
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col += halo;
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// ⑥ 羽化：可见区半径 ≈ 0.96
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float alpha = step(r, 0.75);
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fragColor = vec4(col, alpha);
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}
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