/* 
 * GLSL.js
 * version author: Santiago Itzcoatl
 * original author: Dave DeSandro
 * inscriber: Ordvision Labs
 * license: MIT License
 * copyright 2023 Dave DeSandro
 * https://github.com/desandro
 */
const e=` * GLSL.js * Ordvision Labs * `;console.log("%c"+e,"background: #90e; color: #fff");var width,height,canvas=document.querySelector("canvas"),gl=canvas.getContext("webgl"),mouseX=0,mouseY=0,startTime=new Date().getTime();function Uniform(a,b){this.name=a,this.suffix=b,this.location=gl.getUniformLocation(program,a)}Uniform.prototype.set=function(...a){var b="uniform"+this.suffix,c=[this.location].concat(a);gl[b].apply(gl,c)};function Rect(a){var b=a.createBuffer();a.bindBuffer(a.ARRAY_BUFFER,b),a.bufferData(a.ARRAY_BUFFER,Rect.verts,a.STATIC_DRAW)}Rect.verts=new Float32Array([-1,-1,1,-1,-1,1,1,1]),Rect.prototype.render=function(a){a.drawArrays(a.TRIANGLE_STRIP,0,4)};var program=gl.createProgram(),vertexShaderSource=document.querySelector("#vertex-shader").text,fragmentShaderSource=document.querySelector("#fragment-shader").text;addShader(vertexShaderSource,gl.VERTEX_SHADER),addShader(fragmentShaderSource,gl.FRAGMENT_SHADER),gl.linkProgram(program),gl.useProgram(program);var uResolution=new Uniform("u_resolution","2f"),uMouse=new Uniform("u_mouse","2f"),uTime=new Uniform("u_time","1f"),billboard=new Rect(gl),positionLocation=gl.getAttribLocation(program,"a_position");gl.enableVertexAttribArray(positionLocation),gl.vertexAttribPointer(positionLocation,2,gl.FLOAT,!1,0,0),resize(),animate();function addShader(a,b){var c=gl.createShader(b);gl.shaderSource(c,a),gl.compileShader(c);var d=gl.getShaderParameter(c,gl.COMPILE_STATUS);if(!d)throw new Error("Shader compile error: "+gl.getShaderInfoLog(c));gl.attachShader(program,c)}function animate(){var a=new Date().getTime();uTime.set((a-startTime)/1e3),uMouse.set(mouseX,mouseY),billboard.render(gl),requestAnimationFrame(animate)}function resize(){width=canvas.width=window.innerWidth,height=canvas.height=window.innerHeight,uResolution.set(width,height),gl.viewport(0,0,width,height)}window.addEventListener("resize",resize),document.addEventListener("mousemove",function(a){mouseX=a.pageX,mouseY=height-a.pageY});


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