examples/clamped-array.html

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    <title>twgl.js - clampedarrays</title>
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      canvas {
          display: block;
          width: 100vw;
          height: 100vh;
      }
      #b {
        position: absolute;
        top: 10px;
        width: 100%;
        text-align: center;
        z-index: 2;
      }
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    <canvas id="c"></canvas>
    <div id="b"><a href="http://twgljs.org">twgl.js</a> - clampedarrays</div>
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  <script id="one-point-vs" type="notjs">
uniform mat4 u_worldViewProjection;
uniform vec3 u_lightWorldPos;
uniform mat4 u_world;
uniform mat4 u_viewInverse;
uniform mat4 u_worldInverseTranspose;

attribute vec4 a_position;
attribute vec3 a_normal;
attribute vec2 a_texcoord;

varying vec4 v_position;
varying vec2 v_texCoord;
varying vec3 v_normal;
varying vec3 v_surfaceToLight;
varying vec3 v_surfaceToView;

void main() {
  v_texCoord = a_texcoord;
  v_position = (u_worldViewProjection * a_position);
  v_normal = (u_worldInverseTranspose * vec4(a_normal, 0)).xyz;
  v_surfaceToLight = u_lightWorldPos - (u_world * a_position).xyz;
  v_surfaceToView = (u_viewInverse[3] - (u_world * a_position)).xyz;
  gl_Position = v_position;
}
  </script>
  <script id="one-point-fs" type="notjs">
precision mediump float;

varying vec4 v_position;
varying vec2 v_texCoord;
varying vec3 v_normal;
varying vec3 v_surfaceToLight;
varying vec3 v_surfaceToView;

uniform vec4 u_lightColor;
uniform vec4 u_diffuseMult;
uniform sampler2D u_diffuse;
uniform vec4 u_specular;
uniform float u_shininess;
uniform float u_specularFactor;

vec4 lit(float l ,float h, float m) {
  return vec4(1.0,
              abs(l),//max(l, 0.0),
              (l > 0.0) ? pow(max(0.0, h), m) : 0.0,
              1.0);
}

void main() {
  vec4 diffuseColor = texture2D(u_diffuse, v_texCoord) * u_diffuseMult;
  if (diffuseColor.a < 0.1) {
    discard;
  }
  vec3 a_normal = normalize(v_normal);
  vec3 surfaceToLight = normalize(v_surfaceToLight);
  vec3 surfaceToView = normalize(v_surfaceToView);
  vec3 halfVector = normalize(surfaceToLight + surfaceToView);
  vec4 litR = lit(dot(a_normal, surfaceToLight),
                    dot(a_normal, halfVector), u_shininess);
  vec4 outColor = vec4((
  u_lightColor * (diffuseColor * litR.y +
                u_specular * litR.z * u_specularFactor)).rgb,
      diffuseColor.a);
  gl_FragColor = outColor;
}
  </script>
  <script id="env-map-vs" type="notjs">
uniform mat4 u_viewInverse;
uniform mat4 u_world;
uniform mat4 u_worldViewProjection;
uniform mat4 u_worldInverseTranspose;

attribute vec4 a_position;
attribute vec3 a_normal;

varying vec3 v_normal;
varying vec3 v_surfaceToView;

void main() {
  v_normal = (u_worldInverseTranspose * vec4(a_normal, 0)).xyz;
  v_surfaceToView = (u_viewInverse[3] - (u_world * a_position)).xyz;
  gl_Position = u_worldViewProjection * a_position;
}
  </script>
  <script id="env-map-fs" type="notjs">
precision mediump float;

uniform samplerCube u_texture;

varying vec3 v_surfaceToView;
varying vec3 v_normal;

void main() {
  vec3 normal = normalize(v_normal);
  vec3 surfaceToView = normalize(v_surfaceToView);
  vec4 color = textureCube(u_texture, -reflect(surfaceToView, normal));
  gl_FragColor = color;
}
  </script>
  <script src="../3rdparty/chroma.min.js"></script>
  <script type="module">
    import * as twgl from '../dist/6.x/twgl-full.module.js';
    twgl.setDefaults({attribPrefix: "a_"});
    const m4 = twgl.m4;
    const gl = document.querySelector("#c").getContext("webgl");
    const onePointProgramInfo = twgl.createProgramInfo(gl, ["one-point-vs", "one-point-fs"]);

    // The point of this example is to test using Uint8ClampedArray
    // everywhere possible. So, it's used in both buffer and texture creation
    const arrays = {
      // set normalize false because for int types true is the default (ie, for byte colors and byte normals)
      position: { normalize: false, data: new Int8Array([1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1]) },
      normal:   { normalize: false, data: new Int8Array([1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1]) },
      texcoord: { normalize: false, data: new Uint8ClampedArray([1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1]) },
      indices:  new Uint8ClampedArray([0, 1, 2, 0, 2, 3, 4, 5, 6, 4, 6, 7, 8, 9, 10, 8, 10, 11, 12, 13, 14, 12, 14, 15, 16, 17, 18, 16, 18, 19, 20, 21, 22, 20, 22, 23]),
    };
    const shape = twgl.createBufferInfoFromArrays(gl, arrays);

    function rand(min, max) {
      if (max === undefined) {
        max = min;
        min = 0;
      }
      return min + Math.random() * (max - min);
    }

    // Shared values
    const baseHue = rand(360);
    const lightWorldPosition = [1, 8, -10];
    const lightColor = [1, 1, 1, 1];
    const camera = m4.identity();
    const view = m4.identity();
    const viewProjection = m4.identity();

    const texture = twgl.createTexture(gl, {
      mag: gl.NEAREST,
      min: gl.LINEAR,
      format: gl.LUMINANCE,
      src: new Uint8ClampedArray([
        255,
        128,
        255,
        128,
        255,
        128,
        255,
        128,
      ]),
      width: 1,
    });

    const objects = [];
    const drawObjects = [];
    const numObjects = 100;
    for (let ii = 0; ii < numObjects; ++ii) {
      const programInfo = onePointProgramInfo;
      const uniforms = {
        u_lightWorldPos: lightWorldPosition,
        u_lightColor: lightColor,
        u_diffuseMult: chroma.hsv((baseHue + rand(0, 60)) % 360, 0.4, 0.8).gl(),
        u_specular: [1, 1, 1, 1],
        u_shininess: 50,
        u_specularFactor: 1,
        u_diffuse: texture,
        u_viewInverse: camera,
        u_world: m4.identity(),
        u_worldInverseTranspose: m4.identity(),
        u_worldViewProjection: m4.identity(),
      };
      drawObjects.push({
        programInfo: programInfo,
        bufferInfo: shape,
        uniforms: uniforms,
      });
      objects.push({
        translation: [rand(-10, 10), rand(-10, 10), rand(-10, 10)],
        ySpeed: rand(0.1, 0.3),
        zSpeed: rand(0.1, 0.3),
        uniforms: uniforms,
      });
    }

    function render(time) {
      time *= 0.001;
      twgl.resizeCanvasToDisplaySize(gl.canvas);
      gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);

      gl.enable(gl.DEPTH_TEST);
      gl.enable(gl.BLEND);
      gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
      gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

      const radius = 20;
      const orbitSpeed = time * 0.1;
      const projection = m4.perspective(30 * Math.PI / 180, gl.canvas.clientWidth / gl.canvas.clientHeight, 0.5, 100);
      const eye = [Math.cos(orbitSpeed) * radius, 4, Math.sin(orbitSpeed) * radius];
      const target = [0, 0, 0];
      const up = [0, 1, 0];

      m4.lookAt(eye, target, up, camera);
      m4.inverse(camera, view);
      m4.multiply(projection, view, viewProjection);

      objects.forEach(function(obj) {
        const uni = obj.uniforms;
        const world = uni.u_world;
        m4.identity(world);
        m4.rotateY(world, time * obj.ySpeed, world);
        m4.rotateZ(world, time * obj.zSpeed, world);
        m4.translate(world, obj.translation, world);
        m4.rotateX(world, time, world);
        m4.transpose(m4.inverse(world, uni.u_worldInverseTranspose), uni.u_worldInverseTranspose);
        m4.multiply(viewProjection, uni.u_world, uni.u_worldViewProjection);
      });

      twgl.drawObjectList(gl, drawObjects);

      requestAnimationFrame(render);
    }
    requestAnimationFrame(render);

  </script>
</html>