js实现canvas液态鼠标跟随动画效果代码
代码语言：html
所属分类：动画
代码描述：js实现canvas液态鼠标跟随动画效果代码
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<html>
<head>
<style>
body {
background: #555555;
margin: 0;
}
canvas {
position: fixed;
}
</style>
</head>
<body>
<canvas id="webgl" width="574" height="611" style="width: 574px; height: 611px;"></canvas>
<script id="vertexShader" type="x-shader/x-vertex">
attribute vec4 a_position;
uniform mat4 u_modelViewMatrix;
uniform mat4 u_projectionMatrix;
void main() {
gl_Position = a_position;
}
</script>
<script id="fragmentShader" type="x-shader/x-fragment">
#extension GL_OES_standard_derivatives: enable
precision highp float;
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform vec2 u_oldmouse;
uniform float u_time;
uniform sampler2D u_noise;
uniform int u_frame;
uniform sampler2D u_b_buffer;
uniform bool u_buffer_pass;
#define PI 3.141592653589793
vec2 getScreenSpace() {
vec2 uv = (gl_FragCoord.xy - 0.5 * u_resolution.xy) / min(u_resolution.y, u_resolution.x);
return uv;
}
float sdSegment(in vec2 p, in vec2 a, in vec2 b) {
vec2 pa = p-a,
ba = b-a;
float h = clamp(dot(pa, ba)/dot(ba, ba), 0.0, 1.0);
return length(pa - ba*h);
}
vec4 render_effect() {
vec2 uv = getScreenSpace();
vec2 oldmouse = u_oldmouse.xy;
vec2 mouse = u_mouse.xy;
return vec4(vec3(smoothstep(.02, .0, sdSegment(uv, oldmouse, mouse))), 1.);
}
vec4 blurBuffer(vec2 uv) {
vec3 pixs = vec3(1./u_resolution.xy, 0.)*5.;
vec4 sample = texture2D(u_b_buffer, uv + pixs.zy);
sample += texture2D(u_b_buffer, uv - pixs.zy);
sample += texture2D(u_b_buffer, uv + pixs.xz);
sample += texture2D(u_b_buffer, uv - pixs.xz);
sample *= .25;
return sample;
}
void main() {
vec4 tex = texture2D(u_b_buffer, gl_FragCoord.xy/u_resolution.xy);
tex = blurBuffer(gl_FragCoord.xy/u_resolution.xy);
if (u_buffer_pass) {
gl_FragColor = (tex * .9995 + render_effect());
} else {
float f = sin(min(10., tex.r));
f = smoothstep(0., 1., tex.r);
float tex1 = texture2D(u_b_buffer, gl_FragCoord.xy/u_resolution.xy - 20./u_resolution.xy).r;
float f1 = sin(min(10., tex1));
f1 = smoothstep(0., 1., tex1);
float s = f;
s = 1. - pow(s, .3);
s = s*3.;
float r = smoothstep(0.6, .8, f) - s;
float g = smoothstep(0.5, .5+fwidth(f), f) - s;
float b = smoothstep(0.1, .4, f1) - s;
float sh = clamp(r-b, 0., 1.);
// sh = smoothstep(0., .8, sh);
gl_FragColor = vec4(vec3(r-sh*.5), 1.);
}
}
</script>
<script>
function _defineProperty(obj, key, value) {
if (key in obj) {
Object.defineProperty(obj, key, {
value: value, enumerable: true, configurable: true, writable: true
});
} else {
obj[key] = value;
}return obj;
} /**
* A basic Web GL class. This provides a very basic setup for GLSL shader code.
* Currently it doesn't support anything except for clip-space 3d, but this was
* done so that we could start writing fragments right out of the gate. My
* Intention is to update it with particle and polygonal 3d support later on.
*
* @class WTCGL
* @author Liam Egan <liam@wethecollective.com>
* @version 0.0.8
* @created Jan 16, 2019
*/
class WTCGL {
/**
* The WTCGL Class constructor. If construction of the webGL context fails
* for any reason this will return null.
*
* @TODO make the dimension properties properly optional
* @TODO provide the ability to allow for programmable buffers
*
* @constructor
* @param {HTMLElement} el The canvas element to use as the root
* @param {string} vertexShaderSource The vertex shader source
* @param {string} fragmentShaderSource The fragment shader source
* @param {number} [width] The width of the webGL context. This will default to the canvas dimensions
* @param {number} [height] The height of the webGL context. This will default to the canvas dimensions
* @param {number} [pxratio=1] The pixel aspect ratio of the canvas
* @param {boolean} [styleElement] A boolean indicating whether to apply a style property to the canvas (resizing the canvas by the inverse of the pixel ratio)
* @param {boolean} [webgl2] A boolean indicating whether to try to create a webgl2 context instead of a regulart context
*/
constructor(el, vertexShaderSource, fragmentShaderSource, width, height, pxratio, styleElement, webgl2, params = {}) {
this.run = this.run.bind(this);
this._onRun = () => {};
// Destructure if an object is aprovided instead a series of parameters
if (el instanceof Object && el.el) {
({
el, vertexShaderSource, fragmentShaderSource, width, height, pxratio, webgl2, styleElement
} = el);
}
// If the HTML element isn't a canvas, return null
if (!el instanceof HTMLElement || el.nodeName.toLowerCase() !== 'canvas') {
console.log('Provided element should be a canvas element');
return null;
}
this._el = el;
// The context should be either webgl2, webgl or experimental-webgl
if (webgl2 === true) {
this.isWebgl2 = true;
this._ctx = this._el.getContext("webgl2", this.webgl_params) || this._el.getContext("webgl", this.webgl_params) || this._el.getContext("experimental-webgl", this.webgl_params);
} else {
this.isWebgl2 = false;
this._ctx = this._el.getContext("webgl", Object.assign({}, this.webgl_params, params)) || this._el.getContext("experimental-webgl", Object.assign({}, this.webgl_params, params));
}
// Set up the extensions
this._ctx.getExtension('OES_standard_derivatives');
this._ctx.getExtension('EXT_shader_texture_lod');
this._ctx.getExtension('OES_texture_float');
this._ctx.getExtension('WEBGL_color_buffer_float');
this._ctx.getExtension('OES_texture_float_linear');
this._ctx.getExtension('EXT_color_buffer_float');
// We can't make the context so return an error
if (!this._ctx) {
console.log('Browser doesn\'t support WebGL ');
return null;
}
// Create the shaders
this._vertexShader = WTCGL.createShaderOfType(this._ctx, this._ctx.VERTEX_SHADER, vertexShaderSource);
this._fragmentShader = WTCGL.createShaderOfType(this._ctx, this._ctx.FRAGMENT_SHADER, fragmentShaderSource);
// Create the program and link the shaders
this._program = this._ctx.createProgram();
this._ctx.attachShader(this._program, this._vertexShader);
this._ctx.attachShader(this._program, this._fragmentShader);
this._ctx.linkProgram(this._program);
// If we can't set up the params, this means the shaders have failed for some reason
if (!this._ctx.getProgramParameter(this._program, this._ctx.LINK_STATUS)) {
console.log('Unable to initialize the shader program: ' + this._ctx.getProgramInfoLog(this._program));
return null;
}
// Initialise the vertex buffers
this.initBuffers([
-1.0, 1.0, -1.,
1.0, 1.0, -1.,
-1.0, -1.0, -1.,
1.0, -1.0, -1.]);
// Initialise the frame buffers
this.frameBuffers = [];
// The program information object. This is essentially a state machine for the webGL instance
this._programInfo = {
attribs: {
vertexPosition: this._ctx.getAttribLocation(this._program, 'a_position')
},
uniforms: {
projectionMatrix: this._ctx.getUniformLocation(this._program, 'u_projectionMatrix'),
modelViewMatrix: this._ctx.getUniformLocation(this._program, 'u_modelViewMatrix'),
resolution: this._ctx.getUniformLocation(this._program, 'u_resolution'),
time: this._ctx.getUniformLocation(this._program, 'u_time')
}
};
// Tell WebGL to use our program when drawing
this._ctx.useProgram(this._program);
this.pxratio = pxratio;
this.styleElement = styleElement !== true;
this.resize(width, height);
}
/**
* Public methods
*/
addFrameBuffer(w, h, tiling = 0, buffertype = 0) {
// create to render to
const gl = this._ctx;
const targetTextureWidth = w * this.pxratio;
const targetTextureHeight = h * this.pxratio;
const targetTexture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, targetTexture);
{
// define size and format of level 0
const level = 0;
let internalFormat = gl.RGBA;
const border = 0;
let format = gl.RGBA;
let t;
if (buffertype & WTCGL.TEXTYPE_FLOAT) {
const e = gl.getExtension('OES_texture_float');
window.extension = e;
t = e.FLOAT;
// internalFormat = gl.RGBA32F;
} else if (buffertype & WTCGL.TEXTYPE_HALF_FLOAT_OES) {
// t = gl.renderer.isWebgl2 ? e.HALF_FLOAT : e.HALF_FLOAT_OES;
// gl.renderer.extensions['OES_texture_half_float'] ? gl.renderer.extensions['OES_texture_half_float'].HALF_FLOAT_OES :
// gl.UNSIGNED_BYTE;
const e = gl.getExtension('OES_texture_half_float');
t = this.isWebgl2 ? gl.HALF_FLOAT: e.HALF_FLOAT_OES;
// format = gl.RGBA;
if (this.isWebgl2) {
internalFormat = gl.RGBA16F;
}
// internalFormat = gl.RGB32F;
// format = gl.RGB32F;
// window.gl = gl
// t = e.HALF_FLOAT_OES;
} else {
t = gl.UNSIGNED_BYTE;
}
const type = t;
const data = null;
gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
targetTextureWidth, targetTextureHeight, border,
format, type, data);
// gl.generateMipmap(gl.TEXTURE_2D);
// set the filtering so we don't need mips
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
// Set the parameters based on the passed type
if (tiling === WTCGL.IMAGETYPE_TILE) {
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
} else if (tiling === WTCGL.IMAGETYPE_MIRROR) {
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.MIRRORED_REPEAT);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.MIRRORED_REPEAT);
} else if (tiling === WTCGL.IMAGETYPE_REGULAR) {
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
}
}
// Create and bind the framebuffer
const fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
// attach the texture as the first color attachment
const attachmentPoint = gl.COLOR_ATTACHMENT0;
const level = 0;
gl.framebufferTexture2D(gl.FRAMEBUFFER, attachmentPoint, gl.TEXTURE_2D, targetTexture, level);
return {
w: w * this.pxratio,
h: h * this.pxratio,
fb: fb,
frameTexture: targetTexture
};
}
/**
* Resizes the canvas to a specified width and height, respecting the pixel ratio
*
* @param {number} w The width of the canvas
* @param {number} h The height of the canvas
* @return {Void}
*/
resize(w, h) {
this.width = w;
this.height = h;
this._el.width = w * this.pxratio;
this._el.height = h * this.pxratio;
this._size = [w * this.pxratio,
h * this.pxratio];
if (this.styleElement) {
this._el.style.width = w + 'px';
this._el.style.height = h + 'px';
}
this._ctx.viewportWidth = w * this.pxratio;
this._ctx.viewportHeight = h * this.pxratio;
this._ctx.uniform2fv(this._programInfo.uniforms.resolution, this._size);
this.initBuffers(this._positions);
}
/**
* Initialise a provided vertex buffer
*
* @param {array} positions The vertex positions to initialise
* @return {Void}
*/
initBuffers(positions) {
this._positions = positions;
this._positionBuffer = this._ctx.createBuffer();
this._ctx.bindBuffer(this._ctx.ARRAY_BUFFER, this._positionBuffer);
this._ctx.bufferData(this._ctx.ARRAY_BUFFER,
new Float32Array(positions),
this._ctx.STATIC_DRAW);
}
/**
* Add a uniform to the program. At this time the following types are supported:
* - Float - WTCGL.TYPE_FLOAT
* - Vector 2 - WTCGL.TYPE_V2
* - Vector 3 - WTCGL.TYPE_V3
* - Vector 4 - WTCGL.TYPE_V4
*
* @param {string} name The name of the uniform. N.B. your name will be prepended with a `u_` in your shaders. So providing a name of `foo` here will result in a uniform named `u_foo`
* @param {WTCGL.UNIFORM_TYPE} type The unfiform type
* @param {number|array} value The unfiform value. The type depends on the uniform type being created
* @return {WebGLUniformLocation} The uniform location for later reference
*/
addUniform(name, type, value) {
let uniform = this._programInfo.uniforms[name];
uniform = this._ctx.getUniformLocation(this._program, `u_${name}`);
switch (type) {
case WTCGL.TYPE_INT:
if (!isNaN(value)) this._ctx.uniform1i(uniform, value);
break;
case WTCGL.TYPE_FLOAT:
if (!isNaN(value)) this._ctx.uniform1f(uniform, value);
break;
case WTCGL.TYPE_V2:
if (value instanceof Array && value.length === 2.) this._ctx.uniform2fv(uniform, value);
break;
case WTCGL.TYPE_V3:
if (value instanceof Array && value.length === 3.) this._ctx.uniform3fv(uniform, value);
break;
case WTCGL.TYPE_V4:
if (value instanceof Array && value.length === 4.) this._ctx.uniform4fv(uniform, value);
break;
case WTCGL.TYPE_BOOL:
if (!isNaN(value)) this._ctx.uniform1i(uniform, value);
break;
}
this._programInfo.uniforms[name] = uniform;
return uniform;
}
/**
* Adds a texture to the program and links it to a named uniform. Providing the type changes the tiling properties of the texture. Possible values for type:
* - WTCGL.IMAGETYPE_REGULAR - No tiling, clamp to edges and doesn't need to be power of 2.
* - WTCGL.IMAGETYPE_TILE - full x and y tiling, needs to be power of 2.
* - WTCGL.IMAGETYPE_MIRROR - mirror tiling, needs to be power of 2.
*
* @public
* @param {string} name The name of the uniform. N.B. your name will be prepended with a `u_` in your shaders. So providing a name of `foo` here will result in a uniform named `u_foo`
* @param {WTCGL.TYPE_IMAGETYPE} type The type of texture to create. This is basically the tiling behaviour of the texture as described above
* @param {Image} image The image object to add to the texture
* @return {WebGLTexture} The texture object
*/
addTexture(name, type, image, liveUpdate = false) {
var texture = this._ctx.createTexture();
this._ctx.pixelStorei(this._ctx.UNPACK_FLIP_Y_WEBGL, true);
this._ctx.bindTexture(this._ctx.TEXTURE_2D, texture);
// this._ctx.generateMipmap(this._ctx.TEXTURE_2D);
// Set the parameters based on the passed type
if (type === WTCGL.IMAGETYPE_MIRROR) {
this._ctx.texParameteri(this._ctx.TEXTURE_2D, this._ctx.TEXTURE_WRAP_S, this._ctx.MIRRORED_REPEAT);
this._ctx.texParameteri(this._ctx.TEXTURE_2D, this._ctx.TEXTURE_WRAP_T, this._ctx.MIRRORED_REPEAT);
} else if (type === WTCGL.IMAGETYPE_REGULAR) {
this._ctx.texParameteri(this._ctx.TEXTURE_2D, this._ctx.TEXTURE_WRAP_S, this._ctx.CLAMP_TO_EDGE);
this._ctx.texParameteri(this._ctx.TEXTURE_2D, this._ctx.TEXTURE_WRAP_T, this._ctx.CLAMP_TO_EDGE);
}
this._ctx.texParameteri(this._ctx.TEXTURE_2D, this._ctx.TEXTURE_MIN_FILTER, this._ctx.LINEAR);
// this._ctx.texParameteri(this._ctx.TEXTURE_2D, this._ctx.TEXTURE_MAG_FILTER, this._ctx.LINEAR);
// Upload the image into the texture.
this._ctx.texImage2D(this._ctx.TEXTURE_2D, 0, this._ctx.RGBA, this._ctx.RGBA, this._ctx.UNSIGNED_BYTE, image);
// add the texture to the array of textures.
this.pushTexture(name, texture, image, this._ctx.TEXTURE_2D, liveUpdate);
return texture;
}
pushTexture(name, texture, image, target, liveUpdate = false) {
let textures = this.textures;
textures.push({
name: name, tex: .........完整代码请登录后点击上方下载按钮下载查看
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