regl+gl-matrix实现三维立方体镜面文字动画代码-html代码-BFW代码库

代码语言：html
所属分类：三维
代码描述：regl+gl-matrix实现三维立方体镜面文字动画代码
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>
    html, body {
  background-color: #000;
  min-height: 100%;
}

canvas {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.dribbble {
  position: fixed;
  display: block;
  right: 20px;
  bottom: 20px;
}
.dribbble img {
  display: block;
  height: 28px;
}

.twitter {
  position: fixed;
  display: block;
  right: 64px;
  bottom: 14px;
}
.twitter svg {
  width: 32px;
  height: 32px;
  fill: #1da1f2;
}
</style>

</head>

<body>

        <canvas class="canvas" width="500" height="500"></canvas>


    <!-- dribbble - twitter -->
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/regl.min.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/gl-matrix-min.js"></script>
    <script >
        
        const cubeCanvas = document.querySelector(".canvas");

const regl = createREGL({
  canvas: cubeCanvas,
  attributes: {
    antialias: true,
    alpha: false,
  },
});

let tick;

const play = (action) => {
  if (!tick) {
    tick = regl.frame(action);
  }
};

const stop = () => {
  if (tick) {
    tick.cancel();
    tick = null;
  }
};

const Texture = (regl, src) => {
  const texture = regl.texture();

  const image = new Image();

  image.src = src;

  image.onload = function () {
    texture({
      data: image,
      flipY: true,
      min: "mipmap",
    });
  };

  return texture;
};

const emptyTexture = regl.texture();

const CONTENT_CONFIG = {
  translateX: 0,
  translateY: 0,
  translateZ: 0,
  rotation: 0,
  rotateX: 1,
  rotateY: 1,
  rotateZ: 1,
  scale: 1,
};

const contentDraw = regl({
  frag: `
    precision mediump float;
    #define GLSLIFY 1
    
    uniform vec2 u_resolution;
    uniform sampler2D u_texture;
    uniform int u_maskId;
    uniform int u_typeId;
    uniform sampler2D u_displacement;
    uniform sampler2D u_mask;
    uniform float u_tick;
    
    varying vec2 v_uv;
    
    const float PI2 = 6.283185307179586;
    
    const float PI = 3.141592653589793;
    const float PI2_0 = 6.28318530718;
    
    mat2 scale(vec2 value) {
      return mat2(value.x, 0.0, 0.0, value.y);
    }
    
    mat2 rotate2d(float value){
      return mat2(cos(value), -sin(value), sin(value), cos(value));
    }
    
    vec3 gradient1(vec2 st, float tick) {
      vec3 c1 = vec3(253.0/255.0, 142.0/255.0,  98.0/255.0);
      vec3 c2 = vec3(251.0/255.0,  83.0/255.0, 184.0/255.0);
      vec3 c3 = c2;
      vec3 c4 = vec3( 57.0/255.0,  15.0/255.0, 248.0/255.0);
    
      st.y = 1.0 - st.y;
    
      vec2 toCenter = vec2(0.55, 0.58) - st;
      float angle = atan(toCenter.y, toCenter.x) / PI;
    
      vec3 colorA = mix(c1, c2, smoothstep(0.0, 0.5, angle));
    
      st -= vec2(0.5);
      st *= scale(vec2(1.4));
      st *= rotate2d(-1.44);
      st += vec2(0.5);
    
      vec3 colorB = mix(c2, c3, smoothstep(0.3, 0.8, st.x));
      colorB = mix(colorB, c4, smoothstep(0.55, 1.0, st.x));
    
      return mix(colorA, colorB, smoothstep(0.28, 0.65, st.x));
    }
    
    vec3 gradient2(vec2 st, float tick) {
      vec3 c1 = vec3(1.0, 0.8, 0.2);
      vec3 c2 = vec3(0.92, 0.20, 0.14);
    
      st -= vec2(0.5);
      st *= scale(vec2(3.8));
      st *= rotate2d(tick * PI);
      st += vec2(0.5);
    
      return mix(c1, c2, st.x);
    }
    
    vec3 gradient3(vec2 st, float tick) {
      vec3 c1 = vec3(229.0/255.0, 255.0/255.0, 196.0/255.0);
      vec3 c2 = vec3(200.0/255.0, 255.0/255.0, 224.0/255.0);
      vec3 c3 = vec3(180.0/255.0, 255.0/255.0, 245.0/255.0);
      vec3 c4 = vec3(203.0/255.0, 223.0/255.0, 255.0/255.0);
      vec3 c5 = vec3(233.0/255.0, 201.0/255.0, 255.0/255.0);
    
      st -= vec2(0.5);
      st *= scale(vec2(1.2));
      st *= rotate2d(tick * (PI / 2.5));
      st += vec2(0.5);
    
      vec3 colorB = mix(c1, c2, smoothstep(0.0, 0.25, st.x));
      colorB = mix(colorB, c3, smoothstep(0.25, 0.5, st.x));
      colorB = mix(colorB, c4, smoothstep(0.5, 0.75, st.x));
      colorB = mix(colorB, c5, smoothstep(0.75, 1.0, st.x));
    
      return colorB;
    }
    
    vec3 gradients(int type, vec2 st, float tick) {
      if (type == 1) {
        return gradient1(st, tick);
      } else if (type == 2) {
        return gradient2(st, tick);
      } else if (type == 3) {
        return gradient3(st, tick);
      }
    }
    
    void main() {
      vec2 st = gl_FragCoord.xy / u_resolution;
    
      vec4 displacement = texture2D(u_displacement, st);
      
      vec2 direction = vec2(cos(displacement.r * PI2), sin(displacement.r * PI2));
      float length = displacement.g;
    
      vec2 newUv = v_uv;
    
      newUv.x += (length * 0.07) * direction.x;
      newUv.y += (length * 0.07) * direction.y;
    
      vec4 texture = texture2D(u_texture, newUv);
      float tick = u_tick * 0.009;
    
      vec3 color = gradients(u_typeId, v_uv, tick);
    
      texture.rgb = color + (texture.rgb * color);
    
      vec4 mask = texture2D(u_mask, st);
    
      int maskId = int(mask.r * 4.0 + mask.g * 2.0 + mask.b * 1.0);
    
      if (maskId == u_maskId) {
        gl_FragColor = vec4(texture.rgb, texture.a * mask.a);
      } else {
        discard;
      }
    }
  `,
  vert: `
    precision mediump float;
    #define GLSLIFY 1

    attribute vec3 a_position;
    attribute vec2 a_uv;

    uniform mat4 u_projection;
    uniform mat4 u_view;
    uniform mat4 u_world;

    varying vec2 v_uv;

    void main() {
      v_uv = a_uv;

      gl_Position = u_projection * u_view * u_world * vec4(a_position, 1);
    }
  `,
  attributes: {
    a_position: [
      [-1, -1, 0],
      [1, -1, 0],
      [1, 1, 0],
      [-1, 1, 0],
    ],
    a_uv: [
      [0, 0],
      [1, 0],
      [1, 1],
      [0, 1],
    ],
  },
  uniforms: {
    u_texture: regl.prop("texture"),
    u_typeId: regl.prop("typeId"),
    u_maskId: regl.prop("maskId"),
  },
  depth: {
    enable: true,
    mask: false,
    func: "less",
  },
  blend: {
    enable: true,
    func: {
      srcRGB: "src alpha",
      srcAlpha: 1,
      dstRGB: "one minus src alpha",
      dstAlpha: 1,
    },
    equation: {
      rgb: "add",
      alpha: "add",
    },
    color: [0, 0, 0, 0],
  },
  elements: [0, 1, 2, 0, 2, 3],
  count: 6,
});

const contentSetup = regl({
  context: {
    world: () => {
      const {
        translateX,
        translateY,
        translateZ,
        rotation,
        rotateX,
        rotateY,
        rotateZ,
        scale,
      } = CONTENT_CONFIG;

      const world = mat4.create();

      mat4.translate(world, world, [translateX, translateY, translateZ]);
      mat4.rotate(world, world, rotation, [rotateX, rotateY, rotateZ]);
      mat4.scale(world, world, [scale, scale, scale]);

      return world;
    },
    mask: (context, { mask }) => {
      return mask || emptyTexture;
    },
    displacement: (context, { displacement }) => {
      return displacement || emptyTexture;
    },
  },
  uniforms: {
    u_world: regl.context("world"),
    u_mask: regl.context("mask"),
    u_displacement: regl.context("displacement"),
    u_tick: regl.context("tick"),
  },
});

const content = (props) => {
  contentSetup(props, (context, { textures }) => {
    regl.clear({
      color: [0, 0, 0, 0],
      depth: 1,
    });

    contentDraw(textures);
  });
};

const ContentTypes = {
  GRADIENT: 1,
  RED: 2,
  BLUE: 3,
};

const emptyCube = regl.cube();

const CUBE_CONFIG = {
  translateX: 0,
  translateY: 0,
  translateZ: 0,
  rotation: 0,
  rotateX: 1,
  rotateY: 1,
  rotateZ: 1,
  scale: 1,
  borderWidth: 0.008,
  displacementLength: 0.028,
  reflectionOpacity: 0.3,
  scene: 3,
};

const cube = regl({
  frag: `
    precision mediump float;
    #define GLSLIFY 1
    
    uniform vec2 u_resolution;
    uniform int u_face;
    uniform int u_typeId;
    uniform sampler2D u_texture;
    uniform samplerCube u_reflection;
    uniform float u_tick;
    uniform float u_borderWidth;
    uniform float u_displacementLength;
    uniform float u_reflectionOpacity;
    uniform int u_scene;
    
    varying vec3 v_normal;
    varying vec3 v_center;
    varying vec3 v_point;
    varying vec2 v_uv;
    varying vec3 v_color;
    varying float v_depth;
    
    const float PI2 = 6.283185307179586;
    
    float borders(vec2 uv, float strokeWidth) {
      vec2 borderBottomLeft = smoothstep(vec2(0.0), vec2(strokeWidth), uv);

      vec2 borderTopRight = smoothstep(vec2(0.0), vec2(strokeWidth), 1.0 - uv);
    
      return 1.0 - borderBottomLeft.x * borderBottomLeft.y * borderTopRight.x * borderTopRight.y;
    }
    
    const float PI2_0 = 6.28318530718;
    
    vec4 radialRainbow(vec2 st, float tick) {
      vec2 toCenter = vec2(0.5) - st;
      float angle = mod((atan(toCenter.y, toCenter.x) / PI2_0) + 0.5 + sin(tick * 0.002), 1.0);
    
      // colors
      vec4 c1 = vec4(229.0/255.0, 255.0/255.0, 196.0/255.0, 1.0);
      vec4 c2 = vec4(200.0/255.0, 255.0/255.0, 224.0/255.0, 1.0);
      vec4 c3 = vec4(180.0/255.0, 255.0/255.0, 245.0/255.0, 1.0);
      vec4 c4 = vec4(203.0/255.0, 223.0/255.0, 255.0/255.0, 1.0);
      vec4 c5 = vec4(233.0/255.0, 201.0/255.0, 255.0/255.0, 1.0);
      // vec4 a = vec4(0.43, 0.48, 0.95, 1.0);
      // vec4 b = vec4(0.94, 0.79, 0.41, 1.0);
      // // vec4 b = vec4(0.49, 0.88, 1.00, 1.0);
      // vec4 c = vec4(0.68, 0.29, 0.68, 1.0);
      // vec4 d = vec4(0.94, 0.79, 0.41, 1.0);
      // vec4 e = vec4(0.43, 0.48, 0.95, 1.0);
    
      float step = 1.0 / 10.0;
    
      vec4 color = c1;
    
      color = mix(color, c2, smoothstep(step * 1.0, step * 2.0, angle));
      color = mix(color, c1, smoothstep(step * 2.0, step * 3.0, angle));
      color = mix(color, c2, smoothstep(step * 3.0, step * 4.0, angle));
      color = mix(color, c3, smoothstep(step * 4.0, step * 5.0, angle));
      color = mix(color, c4, smoothstep(step * 5.0, step * 6.0, angle));
      color = mix(color, c3, smoothstep(step * 6.0, step * 7.0, angle));
      color = mix(color, c4, smoothstep(step * 7.0, step * 8.0, angle));
      color = mix(color, c5, smoothstep(step * 8.0, step * 9.0, angle));
      color = mix(color, c1, smoothstep(step * 9.0, step * 10.0, angle));
    
      return color;
    }
    
    mat2 scale(vec2 value){
      return mat2(value.x, 0.0, 0.0, value.y);
    }
    
    mat2 rotate2d(float value){
      return mat2(cos(value), -sin(value), sin(value), cos(value));
    }
    
    vec2 rotateUV(vec2 uv, float rotation) {
      float mid = 0.5;
      return vec2(
        cos(rotation) * (uv.x - mid) + sin(rotation) * (uv.y - mid) + mid,
        cos(rotation) * (uv.y - mid) - sin(rotation) * (uv.x - mid) + mid
      );
    }
    
    vec4 type1() {
      vec2 toCenter = v_center.xy - v_point.xy;
      float angle = (atan(toCenter.y, toCenter.x) / PI2) + 0.5;
      float displacement = borders(v_uv, u_displacementLength) + borders(v_uv, u_displacementLength * 2.143) * 0.3;
    
      return vec4(angle, displacement, 0.0, 1.0);
    }
    
    vec4 type2() {
      return vec4(v_color, 1.0);
    }
    
    vec4 type3() {
      vec2 st = gl_FragCoord.xy / u_resolution;
    
      vec4 strokeColor = radialRainbow(st, u_tick);
      float depth = clamp(smoothstep(-1.0, 1.0, v_depth), 0.6, 0.9);
      vec4 stroke = strokeColor * vec4(borders(v_uv, u_borderWidth)) * depth;
    
      vec4 texture;
    
      if (u_face == -1) {
        vec3 normal = normalize(v_normal);
        texture = textureCube(u_reflection, normalize(v_normal));
    
        texture.a *= u_reflectionOpacity * depth;
      }  else {
        texture = texture2D(u_texture, st);
      }
    
      if (stroke.a > 0.0) {
        return stroke - texture.a;
      } else {
        return texture;
      }
    }
    
    vec4 switchScene(int id) {
      if (id == 1) {
        return type1();
      } else if (id == 2) {
        return type2();
      } else if (id == 3) {
        return type3();
      }
    }
    
    void main() {
      if (u_scene == 3) {
        gl_FragColor = switchScene(u_typeId);
      } else {
        gl_FragColor = switchScene(u_scene);
      }
    }
  `,
  vert: `
    precision mediump float;
    #define GLSLIFY 1
    
    attribute vec3 a_position;
    attribute vec3 a_center;
    attribute vec2 a_uv;
    attribute vec3 a_color;
    
    uniform mat4 u_projection;
    uniform mat4 u_view;
    uniform mat4 u_world;
    
    varying vec3 v_normal;
    varying vec3 v_center;
    varying vec3 v_point;
    varying vec2 v_uv;
    varying vec3 v_color;
    varying float v_depth;
    
    void main() {
      vec4 center = u_projection * u_view * u_world * vec4(a_center, 1.0);
      vec4 position = u_projection * u_view * u_world * vec4(a_position, 1.0);
    
      v_normal = normalize(a_position);
      v_center = center.xyz;
      v_point = position.xyz;
      v_uv = a_uv;
      v_color = a_color;
      v_depth = (mat3(u_view) * mat3(u_world) * a_position).z;
    
      gl_Position = position;
    }
  `,
  context: {
    world: (context, { matrix }) => {
      const {
        translateX,
        translateY,
        translateZ,
        rotation,
        rotateX,
        rotateY,
        rotateZ,
        scale,
      } = CUBE_CONFIG;

      const world = mat4.create();

      mat4.translate(world, world, [translateX, translateY, translateZ]);
      mat4.rotate(world, world, rotation, [rotateX, rotateY, rotateZ]);
      mat4.scale(world, world, [scale, scale, scale]);

      if (matrix) {
        mat4.multiply(world, world, matrix);
      }

      return world;
    },
    face: (context, { cullFace }) => {
      return cullFace === CubeFaces.FRONT ? -1 : 1;
    },
    texture: (context, { texture }) => {
      return texture || emptyTexture;
    },
    reflection: (context, { reflection }) => {
      return reflection || emptyCube;
    },
    textureMatrix: (context, { textureMatrix }) => {
      return textureMatrix;
    },
    borderWidth: () => {
      const { borderWidth } = CUBE_CONFIG;

      return borderWidth;
    },
    displacementLength: () => {
      const { displacementLength } = CUBE_CONFIG;

      return displacementLength;
    },
    reflectionOpacity: () => {
      const { reflectionOpacity } = CUBE_CONFIG;

      return reflectionOpacity;
    },
    scene: () => {
      const { scene } = CUBE_CONFIG;

      return parseFloat(scene);
    },
  },
  attributes: {
    a_position: [
      [-1, +1, +1],
      [+1, +1, +1],
      [+1, -1, +1],
      [-1, -1, +1], // front face
      [+1, +1, +1],
      [+1, +1, -1],
      [+1, -1, -1],
      [+1, -1, +1], // right face
      [+1, +1, -1],
      [-1, +1, -1],
      [-1, -1, -1],
      [+1, -1, -1], // back face
      [-1, +1, -1],
      [-1, +1, +1],
      [-1, -1, +1],
      [-1, -1, -1], // left face
      [-1, +1, -1],
      [+1, +1, -1],
      [+1, +1, +1],
      [-1, +1, +1], // top face
      [-1, -1, -1],
      [+1, -1, -1],
      [+1, -1, +1],
      [-1, -1, +1], // bottom face
    ],
    a_center: [
      [0, 0, 1], // front face
      [1, 0, 0], // right face
      [0, 0, -1], // back face
      [-1, 0, 0], // left face
      [0, 1, 0], // top face
      [0, -1, 0], // bottom face
    ].map((c) => {
      return [c, c, c, c];
    }),
    a_uv: [
      [0, 0],
      [1, 0],
      [1, 1],
      [0, 1], // front face
      [0, 0],
      [1, 0],
      [1, 1],
      [0, 1], // right face
      [0, 0],
      [1, 0],
      [1, 1],
      [0, 1], // back face
      [0, 0],
      [1, 0],
      [1, 1],
      [0, 1], // left face
      [0, 0],
      [1, 0],
      [1, 1],
      [0, 1], // top face
      [0, 0],
      [1, 0],
      [1, 1],
      [0, 1], // bottom face
    ],
    a_color: [
      [0, 1, 0], // front face => mask 2
      [0, 0, 1], // right face => mask 1
      [1, 0, 0], // back face => mask 4
      [1, 1, 0], // left face => mask 6
      [1, 0, 1], // top face => mask 5
      [0, 1, 1], // bottom face => mask 3
    ].map((c) => {
      return [c, c, c, c];
    }),
  },
  uniforms: {
    u_world: regl.context("world"),
    u_face: regl.context("face"),
    u_typeId: regl.prop("typeId"),
    u_texture: regl.context("texture"),
    u_reflection: regl.context("reflection"),
    u_tick: regl.context("tick"),
    u_borderWidth: regl.context("borderWidth"),
    u_displacementLength: regl.context("displacementLength"),
    u_reflectionOpacity: regl.context("reflectionOpacity"),
    u_scene: regl.context("scene"),
  },
  cull: {
    enable: true,
    face: regl.prop("cullFace"),
  },
  depth: {
    enable: true,
    mask: false,
    func: "less",
  },
  blend: {
    enable: true,
    func: {
      srcRGB: "src alpha",
      srcAlpha: 1,
      dstRGB: "one minus src alpha",
      dstAlpha: 1,
    },
    equation: {
      rgb: "add",
      alpha: "add",
    },
    color: [0, 0, 0, 0],
  },
  elements: [
    [2, 1, 0],
    [2, 0, 3], // front face
    [6, 5, 4],
    [6, 4, 7], // right face
    [10, 9, 8],
    [10, 8, 11], // back face
    [14, 13, 12],
    [14, 12, 15], // left face
    [18, 17, 16],
    [18, 16, 19], // top face
    [20, 21, 22],
    [23, 20, 22], // bottom face
  ],
  count: 36,
  framebuffer: regl.prop("fbo"),
});

const CubeTypes = {
  DISPLACEMENT: 1,
  MASK: 2,
  FINAL: 3,
};

const CubeFaces = {
  BACK: "back",
  FRONT: "front",
};

const CubeMasks = {
  M1: 1,
  M2: 2,
  M3: 3,
  M4: 4,
  M5: 5,
  M6: 6,
};

const CAMERA_CONFIG = {
  fov: 35,
  near: 0.01,
  far: 1000,
};

const cameraConfig = {
  eye: [0, 0, 6],
  target: [0, 0, 0],
  up: [0, 1, 0],
};

const camera = regl({
  context: {
    projection: ({ viewportWidth, viewportHeight }) => {
      const { fov, near, far } = CAMERA_CONFIG;
      const fovy = (fov * Math.PI) / 180;
      const aspect = viewportWidth / viewportHeight;

      return mat4.perspective([], fovy, aspect, near, far);
    },

    view: (context, props) => {
      const config = Object.assign({}, cameraConfig, props);

      const { eye, target, up } = config;

      return mat4.lookAt([], eye, target, up);
    },

    fov: () => {
      const { fov } = CAMERA_CONFIG;

      return fov;
    },
  },

  uniforms: {
    u_projection: regl.context("projection"),
    u_view: regl.context("view"),
    u_cameraPosition: regl.context("eye"),
    u_resolution: ({ viewportWidth, viewportHeight }) => {
      return [viewportWidth, viewportHeight];
    },
  },
});

const plane = regl({
  vert: `
    precision mediump float;
    #define GLSLIFY 1
    
    uniform sampler2D u_texture;
    
    varying vec4 vUv;
    
    void main() {
      gl_FragColor = texture2DProj(u_texture, vUv);
    }
  `,
  frag: `
    precision mediump float;
    #define GLSLIFY 1

    attribute vec3 a_position;
    
    uniform mat4 u_textureMatrix;
    uniform mat4 u_world;

    varying vec4 vUv;

    void main() {
      vUv = u_textureMatrix * vec4(a_position, 1.0);

      gl_Position = u_world * vec4(a_position, 1.0);
    }
  `,
  attributes: {
    a_position: [
      [-1, 1, 0],
      [1, -1, 0],
      [-1, -1, 0],
      [-1, 1, 0],
      [1, 1, 0],
      [1, -1, 0],
    ],
  },
  context: {
    world: (context, { uvRotation }) => {
      const world = mat4.create();

      mat4.rotate(world, world, uvRotation, [0, 0, 1]);

      return world;
    },
  },
  uniforms: {
    u_world: regl.context("world"),
    u_texture: regl.prop("texture"),
    u_textureMatrix: regl.prop("textureMatrix"),
  },
  count: 6,
});

const reflector = regl({
  frag: `
    precision mediump float;
    #define GLSLIFY 1
    
    uniform vec2 u_resolution;
    uniform sampler2D u_texture;
    uniform float u_depthOpacity;
    
    varying vec2 v_uv;
    varying float v_z;
    
    mat2 scale(vec2 scale){
      return mat2(scale.x, 0.0, 0.0, scale.y);
    }
    
    void main() {
      vec2 st = gl_FragCoord.xy / u_resolution;
    
      vec4 texture = texture2D(u_texture, v_uv);

      texture.a -= u_depthOpacity * v_z;
    
      gl_FragColor = texture;
    }
  `,
  vert: `
    precision mediump float;
    #define GLSLIFY 1
    
    attribute vec3 a_position;
    attribute vec2 a_uv;
    
    uniform mat4 u_projection;
    uniform mat4 u_view;
    uniform mat4 u_world;
    uniform vec2 u_viewport;
    
    varying vec2 v_uv;
    varying float v_z;
    
    void main() {
      v_uv = a_uv;
      v_z = 1.0 - (mat3(u_view) * mat3(u_world) * a_position).z;
    
      gl_Position = u_projection * u_view * u_world * vec4(a_position, 1);
    }
  `,
  context: {
    world: (
      { viewportWidth, viewportHeight },
      { cameraConfig: mainCameraConfig, fov }
    ) => {
      const fovy = (fov * Math.PI) / 180;
      const aspect = viewportWidth / viewportHeight;
      const cameraHeight = Math.tan(fovy / 2) * mainCameraConfig.eye[2];
      const cameraWidth = cameraHeight * aspect;

      const world = mat4.create();

      mat4.scale(world, world, [cameraWidth, cameraHeight, 1.0]);

      return world;
    },
    depthOpacity: () => {
      const depthOpacity = 0.75;

      return depthOpacity;
    },
  },
  attributes: {
    a_position: [
      [-1, -1, 0],
      [1, -1, 0],
      [1, 1, 0],
      [-1, 1, 0],
    ],
    a_uv: [
      [0, 0],
      [1, 0],
      [1, 1],
      [0, 1],
    ],
  },
  uniforms: {
    u_world: regl.context("world"),
    u_texture: regl.prop("texture"),
    u_depthOpacity: regl.context("depthOpacity"),
  },
  depth: {
    enable: true,
    mask: false,
    func: "less",
  },
  blend: {
    enable: true,
    func: {
      srcRGB: "src alpha",
      srcAlpha: 1,
      dstRGB: "one minus src alpha",
      dstAlpha: 1,
    },
    equation: {
      rgb: "add",
      alpha: "add",
    },
    color: [0, 0, 0, 0],
  },
  elements: [0, 1, 2, 0, 2, 3],
  count: 6,
});

const planes = [
  {
    position: [1, 0, 0],
    normal: [1, 0, 0],
    rotation: -Math.PI * 0.5,
    axis: [0, 1, 0],
    uvRotation: Math.PI,
  },
  {
    position: [-1, 0, 0],
    normal: [-1, 0, 0],
    rotation: Math.PI * 0.5,
    axis: [0, 1, 0],
    uvRotation: Math.PI,
  },
  {
    position: [0, 1, 0],
    normal: [0, 1, 0],
    rotation: Math.PI * 0.5,
    axis: [1, 0, 0],
    uvRotation: 0,
  },
  {
    position: [0, -1, 0],
    normal: [0, -1, 0],
    rotation: -Math.PI * 0.5,
    axis: [1, 0, 0],
    uvRotation: 0,
  },
  {
    position: [0, 0, 1],
    normal: [0, 0, 1],
    rotation: Math.PI,
    axis: [0, 1, 0],
    uvRotation: Math.PI,
  },
  {
    position: [0, 0, -1],
    normal: [0, 0, -1],
    rotation: 0,
    axis: [0, 1, 0],
    uvRotation: Math.PI,
  },
];

const renderTarget = regl.framebuffer();

const reflect = (a, b) => {
  const dot2 = new A.........完整代码请登录后点击上方下载按钮下载查看