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效果图

完整代码和注释

#define PI 3.14159#define TAU 6.28318#iUniform float A = 55. in {0., 300.}#iUniform float B = 35. in {0., 300.}#iUniform float C = .25 in {0., 1.}#iUniform float D = 64. in {0., 200.}#iUniform float E = 5. in {0., 20.}#iUniform float F = .4 in {0., 1.}void mainImage( out vec4 fragColor, in vec2 fragCoord ){    vec2 uv = (fragCoord.xy - 0.5 * iResolution.xy) / iResolution.y;    if (iMouse.z > 0.5)        uv.y = 1.0 - uv.y;                  ///< 垂直翻转    uv.x = uv.x * D;                        ///< 划分水平间隔，控制雨滴的个数    float dx = fract(uv.x);                 ///< 每个间隔内的坐标    uv.x = floor(uv.x);                     ///&

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