xiaoxiaofangkuaizhen_emojo/assets/res/Shaders/Lib/shape.chunk

#ifndef SHAPE_INCLUDE
#define SHAPE_INCLUDE

#include <builtin/uniforms/cc-global>
#include <./Lib/common>

float UniversalMask2D(vec2 uv, vec2 center, float intensity, float roundness, float smoothness) {
    vec2 d = abs(uv - center) * intensity;
    d = pow(saturate(d), vec2(roundness));
    float dist = length(d);
    float vfactor = pow(saturate(1.0 - dist * dist), smoothness);
    return vfactor;
}

// 创建圆
float createCircle(vec2 uv, vec2 pos, float radius, float smoothness) {
    float dis = distance(pos, uv);
    dis = smoothstep(radius + smoothness, radius, dis);
    return dis;
}
// 齿轮
float createGear(vec2 uv, vec2 pos, float scale) {
    vec2 dir = pos - uv;
    float radius = length(dir) * scale;
    float angle = atan(dir.y, dir.x);
    //造型函数
    float f = smoothstep(-0.484, 1., cos(angle * 10.0)) * 0.080 + 0.372;
    float dis = 1. - smoothstep(f, f + 0.02, radius);
    return dis;
}
// 花瓣
float createPetal(vec2 uv, vec2 pos, float scale) {
    vec2 dir = pos - uv;
    float radius = length(dir) * scale;
    float angle = atan2(dir.y, dir.x);
    //造型函数
    float f = abs(cos(angle * 2.5)) * .5 + .3;
    float dis = 1. - smoothstep(f, f + 0.02, radius);
    return dis;
}

// 水滴
float createWaterDrop(vec2 uv, vec2 pos, float scale) {
    vec2 dir = pos - uv;
    float radius = length(dir) * scale;
    float angle = atan2(dir.y, dir.x);
    //造型函数
    float f = 1.0 - pow(abs(angle + -1.548), 2.416);
    float dis = 1. - smoothstep(f, f + 0.02, radius);
    return dis;
}

// 风车
float createWindmill(vec2 uv, vec2 pos, float scale) {
    vec2 dir = pos - uv;
    float radius = length(dir) * scale;
    float angle = atan2(dir.y, dir.x);

    float f = frac(angle * 1.273) * 0.956;
    float dis = 1. - smoothstep(f, f + 0.02, radius);
    return dis;
}

#endif