示例

HTML

<body><canvas id="canvas" width="1400" height="600"></canvas>
</body>

CSS

body {background-color: #000;    margin: 0;overflow: hidden;background-repeat: no-repeat;
}

JS

var canvas = document.getElementById("canvas");canvas.width = window.innerWidth;
canvas.height = window.innerHeight;// Initialize the GL context
var gl = canvas.getContext('webgl');
if(!gl){console.error("Unable to initialize WebGL.");
}//Time
var time = 0.0;//************** Shader sources **************var vertexSource = `
attribute vec2 position;
void main() {gl_Position = vec4(position, 0.0, 1.0);
}
`;var fragmentSource = `
precision highp float;uniform float width;
uniform float height;
vec2 resolution = vec2(width, height);uniform float time;#define POINT_COUNT 8vec2 points[POINT_COUNT];
const float speed = -0.5;
const float len = 0.25;
float intensity = 0.9;
float radius = 0.015;//https://www.shadertoy.com/view/MlKcDD
//Signed distance to a quadratic bezier
float sdBezier(vec2 pos, vec2 A, vec2 B, vec2 C){    vec2 a = B - A;vec2 b = A - 2.0*B + C;vec2 c = a * 2.0;vec2 d = A - pos;float kk = 1.0 / dot(b,b);float kx = kk * dot(a,b);float ky = kk * (2.0*dot(a,a)+dot(d,b)) / 3.0;float kz = kk * dot(d,a);      float res = 0.0;float p = ky - kx*kx;float p3 = p*p*p;float q = kx*(2.0*kx*kx - 3.0*ky) + kz;float h = q*q + 4.0*p3;if(h >= 0.0){ h = sqrt(h);vec2 x = (vec2(h, -h) - q) / 2.0;vec2 uv = sign(x)*pow(abs(x), vec2(1.0/3.0));float t = uv.x + uv.y - kx;t = clamp( t, 0.0, 1.0 );// 1 rootvec2 qos = d + (c + b*t)*t;res = length(qos);}else{float z = sqrt(-p);float v = acos( q/(p*z*2.0) ) / 3.0;float m = cos(v);float n = sin(v)*1.732050808;vec3 t = vec3(m + m, -n - m, n - m) * z - kx;t = clamp( t, 0.0, 1.0 );// 3 rootsvec2 qos = d + (c + b*t.x)*t.x;float dis = dot(qos,qos);res = dis;qos = d + (c + b*t.y)*t.y;dis = dot(qos,qos);res = min(res,dis);qos = d + (c + b*t.z)*t.z;dis = dot(qos,qos);res = min(res,dis);res = sqrt( res );}return res;
}//http://mathworld.wolfram.com/HeartCurve.html
vec2 getHeartPosition(float t){return vec2(16.0 * sin(t) * sin(t) * sin(t),-(13.0 * cos(t) - 5.0 * cos(2.0*t)- 2.0 * cos(3.0*t) - cos(4.0*t)));
}//https://www.shadertoy.com/view/3s3GDn
float getGlow(float dist, float radius, float intensity){return pow(radius/dist, intensity);
}float getSegment(float t, vec2 pos, float offset, float scale){for(int i = 0; i < POINT_COUNT; i++){points[i] = getHeartPosition(offset + float(i)*len + fract(speed * t) * 6.28);}vec2 c = (points[0] + points[1]) / 2.0;vec2 c_prev;float dist = 10000.0;for(int i = 0; i < POINT_COUNT-1; i++){//https://tinyurl.com/y2htbwkmc_prev = c;c = (points[i] + points[i+1]) / 2.0;dist = min(dist, sdBezier(pos, scale * c_prev, scale * points[i], scale * c));}return max(0.0, dist);
}void main(){vec2 uv = gl_FragCoord.xy/resolution.xy;float widthHeightRatio = resolution.x/resolution.y;vec2 centre = vec2(0.5, 0.5);vec2 pos = centre - uv;pos.y /= widthHeightRatio;//Shift upwards to centre heartpos.y += 0.02;float scale = 0.000015 * height;float t = time;//Get first segmentfloat dist = getSegment(t, pos, 0.0, scale);float glow = getGlow(dist, radius, intensity);vec3 col = vec3(0.0);//White corecol += 10.0*vec3(smoothstep(0.003, 0.001, dist));//Pink glowcol += glow * vec3(0.94,0.14,0.4);//Get second segmentdist = getSegment(t, pos, 3.4, scale);glow = getGlow(dist, radius, intensity);//White corecol += 10.0*vec3(smoothstep(0.003, 0.001, dist));//Blue glowcol += glow * vec3(0.2,0.6,1.0);//Tone mappingcol = 1.0 - exp(-col);//Output to screengl_FragColor = vec4(col,1.0);
}
`;//************** Utility functions **************window.addEventListener('resize', onWindowResize, false);function onWindowResize(){canvas.width  = window.innerWidth;canvas.height = window.innerHeight;gl.viewport(0, 0, canvas.width, canvas.height);gl.uniform1f(widthHandle, window.innerWidth);gl.uniform1f(heightHandle, window.innerHeight);
}//Compile shader and combine with source
function compileShader(shaderSource, shaderType){var shader = gl.createShader(shaderType);gl.shaderSource(shader, shaderSource);gl.compileShader(shader);if(!gl.getShaderParameter(shader, gl.COMPILE_STATUS)){throw "Shader compile failed with: " + gl.getShaderInfoLog(shader);}return shader;
}//From https://codepen.io/jlfwong/pen/GqmroZ
//Utility to complain loudly if we fail to find the attribute/uniform
function getAttribLocation(program, name) {var attributeLocation = gl.getAttribLocation(program, name);if (attributeLocation === -1) {throw 'Cannot find attribute ' + name + '.';}return attributeLocation;
}function getUniformLocation(program, name) {var attributeLocation = gl.getUniformLocation(program, name);if (attributeLocation === -1) {throw 'Cannot find uniform ' + name + '.';}return attributeLocation;
}//************** Create shaders **************//Create vertex and fragment shaders
var vertexShader = compileShader(vertexSource, gl.VERTEX_SHADER);
var fragmentShader = compileShader(fragmentSource, gl.FRAGMENT_SHADER);//Create shader programs
var program = gl.createProgram();
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);
gl.linkProgram(program);gl.useProgram(program);//Set up rectangle covering entire canvas
var vertexData = new Float32Array([-1.0,  1.0,     // top left-1.0, -1.0,  // bottom left1.0,  1.0,    // top right1.0, -1.0,  // bottom right
]);//Create vertex buffer
var vertexDataBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexDataBuffer);
gl.bufferData(gl.ARRAY_BUFFER, vertexData, gl.STATIC_DRAW);// Layout of our data in the vertex buffer
var positionHandle = getAttribLocation(program, 'position');gl.enableVertexAttribArray(positionHandle);
gl.vertexAttribPointer(positionHandle,2,                // position is a vec2 (2 values per component)gl.FLOAT, // each component is a floatfalse,      // don't normalize values2 * 4,        // two 4 byte float components per vertex (32 bit float is 4 bytes)0                // how many bytes inside the buffer to start from);//Set uniform handle
var timeHandle = getUniformLocation(program, 'time');
var widthHandle = getUniformLocation(program, 'width');
var heightHandle = getUniformLocation(program, 'height');gl.uniform1f(widthHandle, window.innerWidth);
gl.uniform1f(heightHandle, window.innerHeight);var lastFrame = Date.now();
var thisFrame;function draw(){//Update timethisFrame = Date.now();time += (thisFrame - lastFrame)/1000;  lastFrame = thisFrame;//Send uniforms to programgl.uniform1f(timeHandle, time);//Draw a triangle strip connecting vertices 0-4gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);requestAnimationFrame(draw);
}draw();

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Neon Love（霓虹爱）

Neon Love（霓虹爱）

示例

HTML

CSS

JS

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