参考自：https://www.shadertoy.com/view/lsX3Rr

iChannel0是一幅由一系列连贯动作的彩虹猫组成的图像，如下图所示

ichannel1是任意一副背景图像

效果图

GLSL代码与算法注释如下：

uniform float iGlobalTime;
uniform sampler2D iChannel0;
uniform sampler2D iChannel1;vec2 iResolution = vec2(512., 512.);void main()
{vec2 p = vec2(gl_FragCoord.x/ iResolution.x,  gl_FragCoord.y/ iResolution.y) ;// 背景滚动的uvvec2 uv = vec2( p.x+mod(iGlobalTime,2.0), p.y );   vec3 bg = vec3(0.0,51.0/255.0,102.0/255.0);float f = texture2D( iChann