import { Effect } from "babylonjs";

let name = 'digitalrainPixelShader';
let shader = `
varying vec2 vUV;
uniform sampler2D textureSampler;
uniform sampler2D digitalRainFont;

uniform vec4 digitalRainFontInfos;
uniform vec4 digitalRainOptions;
uniform mat4 matrixSpeed;
uniform float cosTimeZeroOne;

float getLuminance(vec3 color)
{
return clamp(dot(color,vec3(0.2126,0.7152,0.0722)),0.,1.);
}

void main(void) 
{
float caracterSize=digitalRainFontInfos.x;
float numChar=digitalRainFontInfos.y-1.0;
float fontx=digitalRainFontInfos.z;
float fonty=digitalRainFontInfos.w;
float screenx=digitalRainOptions.x;
float screeny=digitalRainOptions.y;
float ratio=screeny/fonty;
float columnx=float(floor((gl_FragCoord.x)/caracterSize));
float tileX=float(floor((gl_FragCoord.x)/caracterSize))*caracterSize/screenx;
float tileY=float(floor((gl_FragCoord.y)/caracterSize))*caracterSize/screeny;
vec2 tileUV=vec2(tileX,tileY);
vec4 tileColor=texture2D(textureSampler,tileUV);
vec4 baseColor=texture2D(textureSampler,vUV);
float tileLuminance=getLuminance(tileColor.rgb);
int st=int(mod(columnx,4.0));
float speed=cosTimeZeroOne*(sin(tileX*314.5)*0.5+0.6); 
float x=float(mod(gl_FragCoord.x,caracterSize))/fontx;
float y=float(mod(speed+gl_FragCoord.y/screeny,1.0));
y*=ratio;
vec4 finalColor=texture2D(digitalRainFont,vec2(x,1.0-y));
vec3 high=finalColor.rgb*(vec3(1.2,1.2,1.2)*pow(1.0-y,30.0));
finalColor.rgb*=vec3(pow(tileLuminance,5.0),pow(tileLuminance,1.5),pow(tileLuminance,3.0));
finalColor.rgb+=high;
finalColor.rgb=clamp(finalColor.rgb,0.,1.);
finalColor.a=1.0;
finalColor=mix(finalColor,tileColor,digitalRainOptions.w);
finalColor=mix(finalColor,baseColor,digitalRainOptions.z);
gl_FragColor=finalColor;
}`;

Effect.ShadersStore[name] = shader;

export { shader, name };