webgl照片粒子化动画效果代码-html代码-BFW代码库

代码语言：html
所属分类：动画
代码描述：webgl照片粒子化动画效果代码
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

<!DOCTYPE html>
<html lang="en" >

<head>

  <meta charset="UTF-8">
  

  
  
  
<style>
body {
  margin: 0;
  background-color: black;
}

.loading {
  color: white;
}

.canvas-container {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;

  font-family: sans-serif;

  background-color: black;
}

canvas {
  max-height: 100vh;
  max-width: 100vw;
}

.toggle-help-link {
  position: absolute;
  bottom: 10px;
  right: 10px;

  font-size: 12px;
  text-decoration: none;

  color: lightgrey;
}

.status {
  position: absolute;
  bottom: 10px;
  left: 10px;

  font-size: 12px;

  color: lightgrey;
}

.help-container {
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;

  display: flex;
  align-items: center;
  justify-content: center;

  background-color: rgba(0, 0, 0, 0.4);
  color: white;
  backdrop-filter: blur(3px);
}

.help-container .help {
  width: 90%;
  max-width: 500px;
}

.help li {
  margin-bottom: 1em;
}

.help a {
  color: inherit;
}
</style>


</head>

<body  >
  <!-- this pen was built and maintained in https://github.com/callumacrae/sketchbook/blob/master/src/views/ParticlePhotoWebgl.vue -->

<p class="loading">loading…</p>

<div class="canvas-container" style="display: none">
  <canvas
          ref="canvas"
          @click="status = status === 'playing' ? 'paused' : 'playing'"
          @dragenter.prevent
          @dragleave.prevent
          @dragover.prevent
          @drop.prevent="handleDrop"
          ></canvas>
  <GlobalEvents target="window" @resize="setSize" />

  <div class="help-container" v-show="showHelp || showIosWarning">
    <div class="help" v-show="showIosWarning">
      <h2 style="color: red">WARNING</h2>
      <p>
        Due to a bug in how iOS handles webgl instancing, this animation
        performs incredibly poorly on iOS—to the point where it doesn't really
        work at all. On my phone, it runs at 0.0075 fps and makes my phone
        heat up to the temperature of the sun.
      </p>

      <p>
        I'd recommend trying this on desktop (it also just looks better), but
        if you really want to see what happens on iOS, you can
        <a
           href
           @click.prevent="
                           showIosWarning = false;
                           status = 'playing';
                           "
           >
          proceed anyway</a
          >.
      </p>
    </div>
    <div class="help" v-show="showHelp">
      <h2>Instructions</h2>

      <p>
        This experiment visualises images as collections of animated coloured
        particles.
      </p>

      <p>
        In addition to providing a few images (selectable on the configuration
        in the top right of the screen), it also allows you to upload your own
        by dragging and dropping them onto the canvas.
      </p>

      <p>
        Through a bit of experimentation, I've found the following makes the
        best images:
      </p>

      <ul>
        <li>
          Lower resolution images or blurred images work better as it prevents
          the particles from changing size and colour too quickly as they move
          about. Most of the demo images are lower than 500px wide.
        </li>

        <li>
          Images with lots of contrast between lighter and darker areas make
          more effective graphics. Similarly, images where the details are on
          the lighter parts of the images and the backgrounds are dark also
          look better.
        </li>

        <li>
          Some images, especially images with finer details, look better with
          a high number of smaller points (adjust pointSizeMultiplier), while
          others look better with a low number of larger points.
        </li>
      </ul>

      <p>
        To export high quality videos from this you'll need to
        <a href="https://github.com/callumacrae/sketchbook">clone the repo</a>
        and look for the <code>this.record</code> call in
        ParticlePhotoWebgl.vue (or ask me for help on Twitter!)
      </p>
    </div>
  </div>

  <p class="status" v-show="status === 'paused' && !showIosWarning" @click="status = 'playing'">
    paused, click to resume
  </p>

  <a
     v-if="!showIosWarning"
     class="toggle-help-link"
     href
     @click.prevent="showHelp = !showHelp"
     >
    toggle help
  </a>
</div>

<script type="nojs" id="vs">
precision mediump float;

//
// Description : Array and textureless GLSL 2D simplex noise function.
//      Author : Ian McEwan, Ashima Arts.
//  Maintainer : stegu
//     Lastmod : 20110822 (ijm)
//     License : Copyright (C) 2011 Ashima Arts. All rights reserved.
//               Distributed under the MIT License. See LICENSE file.
//               https://github.com/ashima/webgl-noise
//               https://github.com/stegu/webgl-noise
// 

vec3 mod289(vec3 x) {
  return x - floor(x * (1.0 / 289.0)) * 289.0;
}

vec2 mod289(vec2 x) {
  return x - floor(x * (1.0 / 289.0)) * 289.0;
}

vec3 permute(vec3 x) {
  return mod289(((x*34.0)+10.0)*x);
}

float noise2d(vec2 v)
  {
  const vec4 C = vec4(0.211324865405187,  // (3.0-sqrt(3.0))/6.0
                      0.366025403784439,  // 0.5*(sqrt(3.0)-1.0)
                     -0.577350269189626,  // -1.0 + 2.0 * C.x
                      0.024390243902439); // 1.0 / 41.0
// First corner
  vec2 i  = floor(v + dot(v, C.yy) );
  vec2 x0 = v -   i + dot(i, C.xx);

// Other corners
  vec2 i1;
  //i1.x = step( x0.y, x0.x ); // x0.x > x0.y ? 1.0 : 0.0
  //i1.y = 1.0 - i1.x;
  i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
  // x0 = x0 - 0.0 + 0.0 * C.xx ;
  // x1 = x0 - i1 + 1.0 * C.xx ;
  // x2 = x0 - 1.0 + 2.0 * C.xx ;
  vec4 x12 = x0.xyxy + C.xxzz;
  x12.xy -= i1;

// Permutations
  i = mod289(i); // Avoid truncation effects in permutation
  vec3 p = permute( permute( i.y + vec3(0.0, i1.y, 1.0 ))
		+ i.x + vec3(0.0, i1.x, 1.0 ));

  vec3 m = max(0.5 - vec3(dot(x0,x0), dot(x12.xy,x12.xy), dot(x12.zw,x12.zw)), 0.0);
  m = m*m ;
  m = m*m ;

// Gradients: 41 points uniformly over a line, mapped onto a diamond.
// The ring size 17*17 = 289 is close to a multiple of 41 (41*7 = 287)

  vec3 x = 2.0 * fract(p * C.www) - 1.0;
  vec3 h = abs(x) - 0.5;
  vec3 ox = floor(x + 0.5);
  vec3 a0 = x - ox;

// Normalise gradients implicitly by scaling m
// Approximation of: m *= inversesqrt( a0*a0 + h*h );
  m *= 1.79284291400159 - 0.85373472095314 * ( a0*a0 + h*h );

// Compute final noise value at P
  vec3 g;
  g.x  = a0.x  * x0.x  + h.x  * x0.y;
  g.yz = a0.yz * x12.xz + h.yz * x12.yw;
  return 130.0 * dot(m, g);
}

attribute float a_x;
attribute float a_initial_offset;
attribute float a_speed;

uniform float u_time;
uniform sampler2D u_image_texture;
uniform float u_width;
uniform float u_x_in_noise_multiplier;
uniform float u_x_out_noise_multiplier;
uniform float u_y_in_noise_multiplier;
uniform float u_y_out_noise_multiplier;
uniform float u_point_size_multiplier;

varying vec2 v_position;
varying float v_initial_offset;

void main() {
  vec2 position = vec2(2.0 * a_x - 1.0, 0.0);

  float offset_y = mod(a_initial_offset + 1.0 + a_speed * u_time / 500000.0, 2.0) - 1.0;

  position.x += noise2d(
      vec2(a_x * u_x_in_noise_multiplier + 123.4, offset_y * 0.5 + u_time / 100000.0)
    ) * u_x_out_noise_multiplier;
  position.y += offset_y + noise2d(
      vec2(a_x * u_y_in_noise_multiplier, u_time / 10000.0 + 100.0)
    ) * u_y_out_noise_multiplier;

  position.y *= 1.1;

  v_position = position;
  v_initial_offset = a_initial_offset;

  gl_Position = vec4(position, 0.0, 1.0);
  gl_PointSize = u_width / 660.0 * u_point_size_multiplier;
}
</script>

<script type="nojs" id="fs">
precision mediump float;

uniform sampler2D u_image_texture;
uniform float u_radius_val_exponent;
uniform float u_alpha_val_exponent;
uniform float u_alpha_val_multiplier;
uniform bool u_color;
uniform float u_twinkle_frequency;
uniform float u_twinkle_intensity;
uniform float u_twinkle_factor;

varying vec2 v_position;
varying float v_initial_offset;

void main() {
  vec2 position = v_position;
  position.y *= -1.0;

  vec4 texture_color = texture2D(u_image_texture, (position + 1.0) / 2.0);

  // http://www.johndcook.com/blog/2009/08/24/algorithms-convert-color-grayscale/
  // The alpha multiplication stops random transparent white pixels from ruining everything
  float intensity = (0.21 * texture_color.r + 0.71 * texture_color.g + 0.07 * texture_color.b) * texture_color.a;

  float radius_val = pow(intensity, u_radius_val_exponent);
  float alpha_val = pow(intensity, u_alpha_val_exponent) * u_alpha_val_multiplier;

  float twinkle_y_normalised = abs(mod((position.y - v_initial_offset * 123.0) * 100.0, u_twinkle_frequency * 2.0) - u_twinkle_frequency);
  float twinkle_value = 1.0 - u_twinkle_factor + u_twinkle_factor * smoothstep(
      u_twinkle_frequency * (1.0 - 1.0 / u_twinkle_intensity / u_twinkle_frequency * 5.0),
      u_twinkle_frequency,
      twinkle_y_normalised
    );

  vec2 pc = (gl_PointCoord - 0.5) * 2.0;
  float dist = sqrt(pc.x * pc.x + pc.y * pc.y);
  float alpha = alpha_val * sm.........完整代码请登录后点击上方下载按钮下载查看