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CSS

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HTML 

              
                
<!DOCTYPE html>
<html>

<script id="vertex-shader" type="x-shader/x-vertex">

/* bump map vertex shader */

varying vec3 L; /* light vector in texture-space coordinates */
varying vec3 V; /* view vector in texture-space coordinates */

attribute vec2 vTexCoord;
attribute vec4 vPosition;

uniform vec4 normal;
uniform vec4 lightPosition;
uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
uniform mat3 normalMatrix;
uniform vec3 objTangent; /* tangent vector in object coordinates */

varying vec2 fTexCoord;

void main()
{
    gl_Position = projectionMatrix*modelViewMatrix*vPosition;

    fTexCoord = vTexCoord;

    vec3 eyePosition = (modelViewMatrix*vPosition).xyz;
    vec3 eyeLightPos = (modelViewMatrix*lightPosition).xyz;

   /* normal, tangent and binormal in eye coordinates */

    vec3 N = normalize(normalMatrix*normal.xyz);
    vec3 T  = normalize(normalMatrix*objTangent);
    vec3 B = cross(N, T);

    /* light vector in texture space */

    L.x = dot(T, eyeLightPos-eyePosition);
    L.y = dot(B, eyeLightPos-eyePosition);
    L.z = dot(N, eyeLightPos-eyePosition);

    L = normalize(L);

    /* view vector in texture space */

    V.x = dot(T, -eyePosition);
    V.y = dot(B, -eyePosition);
    V.z = dot(N, -eyePosition);

    V = normalize(V);
    
}
</script>

<script id="fragment-shader" type="x-shader/x-fragment">

precision mediump float;

varying vec3 L;
varying vec3 V;
varying vec2 fTexCoord;

uniform sampler2D texMap;
uniform vec4 diffuseProduct;

void main()
{
   vec4 N = texture2D(texMap, fTexCoord);
   vec3 NN =  normalize(2.0*N.xyz-1.0);
   vec3 LL = normalize(L);
   float Kd = max(dot(NN, LL), 0.0);
   gl_FragColor = vec4(Kd*diffuseProduct.xyz, 1.0);
}
</script>

<script type="text/javascript" src="https://www.cs.unm.edu/~angel/WebGL/7E/Common/webgl-utils.js"></script>
<script type="text/javascript" src="https://www.cs.unm.edu/~angel/WebGL/7E/Common/InitShaders.js"></script>
<script type="text/javascript" src="https://www.cs.unm.edu/~angel/WebGL/7E/Common/MV.js"></script>

<body>
<canvas id="gl-canvas" width="512" height="512">
Oops ... your browser doesn't support the HTML5 canvas element
</canvas>
  
  </body>
</html>
!

CSS
!

JS 

              
                var canvas;
var gl;

var texSize = 256;

// Bump Data
var data = new Array();
for (var i = 0; i <= texSize; i++) data[i] = new Array();
for (var i = 0; i <= texSize; i++)
  for (var j = 0; j <= texSize; j++) data[i][j] = 0.0;
for (var i = texSize / 4; i < 3 * texSize / 4; i++)
  for (var j = texSize / 4; j < 3 * texSize / 4; j++) data[i][j] = 1.0;

// Bump Map Normals
function computeBumpMapNormals(data) {
  var normalst = new Array();
  for (var i = 0; i < data.length-1; i++) normalst[i] = new Array();
  for (var i = 0; i < data.length-1; i++)
    for (var j = 0; j < data[0].length-1; j++) normalst[i][j] = new Array();
  for (var i = 0; i < data.length-1; i++)
    for (var j = 0; j < data[0].length-1; j++) {
      normalst[i][j][0] = data[i][j] - data[i + 1][j];
      normalst[i][j][1] = data[i][j] - data[i][j + 1];
      normalst[i][j][2] = 1;
    }

  // Scale to [1, 0] Texture Coordinates
  for (var i = 0; i < normalst.length; i++)
    for (var j = 0; j < normalst[0].length; j++) {
      var d = 0;
      for (k = 0; k < 3; k++) d += normalst[i][j][k] * normalst[i][j][k];
      d = Math.sqrt(d);
      for (k = 0; k < 3; k++)
        normalst[i][j][k] = 0.5 * normalst[i][j][k] / d + 0.5;
    }

  // Normal Texture flat array
  var normals = new Uint8Array(3 * data.length * data[0].length);

  for (var i = 0; i < normalst.length; i++)
    for (var j = 0; j < normalst[0].length; j++)
      for (var k = 0; k < 3; k++)
        normals[3 * normalst[0].length * i + 3 * j + k] = 255 * normalst[i][j][k];

  return normals;
}

var numVertices = 6;

var pointsArray = [];
var texCoordsArray = [];

var texCoord = [vec2(0, 0), vec2(0, 1), vec2(1, 1), vec2(1, 0)];

var vertices = [
  vec4(0.0, 0.0, 0.0, 1.0),
  vec4(1.0, 0.0, 0.0, 1.0),
  vec4(1.0, 0.0, 1.0, 1.0),
  vec4(0.0, 0.0, 1.0, 1.0)
];

var modelViewMatrix, projectionMatrix, normalMatrix;

var eye = vec3(2.0, 2.0, 2.0);
var at = vec3(0.5, 0.0, 0.5);
var up = vec3(0.0, 1.0, 0.0);

var normal = vec4(0.0, 1.0, 0.0, 0.0);
var tangent = vec3(1.0, 0.0, 0.0);

var lightPosition = vec4(0.0, 2.0, 0.0, 1.0);
var lightDiffuse = vec4(1.0, 1.0, 1.0, 1.0);

var materialDiffuse = vec4(0.7, 0.7, 0.7, 1.0);

var program;

var time = 0;

// from glMatrix.js
// Put in MV.js
function mat4ToInverseMat3(mat) {
  dest = mat3();

  var a00 = mat[0][0],
    a01 = mat[0][1],
    a02 = mat[0][2];
  var a10 = mat[1][0],
    a11 = mat[1][1],
    a12 = mat[1][2];
  var a20 = mat[2][0],
    a21 = mat[2][1],
    a22 = mat[2][2];

  var b01 = a22 * a11 - a12 * a21;
  var b11 = -a22 * a10 + a12 * a20;
  var b21 = a21 * a10 - a11 * a20;

  var d = a00 * b01 + a01 * b11 + a02 * b21;
  if (!d) {
    return null;
  }
  var id = 1 / d;

  dest[0][0] = b01 * id;
  dest[0][1] = (-a22 * a01 + a02 * a21) * id;
  dest[0][2] = (a12 * a01 - a02 * a11) * id;
  dest[1][0] = b11 * id;
  dest[1][1] = (a22 * a00 - a02 * a20) * id;
  dest[1][2] = (-a12 * a00 + a02 * a10) * id;
  dest[2][0] = b21 * id;
  dest[(2)[1]] = (-a21 * a00 + a01 * a20) * id;
  dest[2][2] = (a11 * a00 - a01 * a10) * id;

  return dest;
}

function configureTexture(image) {
  texture = gl.createTexture();
  gl.activeTexture(gl.TEXTURE0);
  gl.bindTexture(gl.TEXTURE_2D, texture);
  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
  gl.texImage2D(
    gl.TEXTURE_2D,
    0,
    gl.RGB,
    texSize,
    texSize,
    0,
    gl.RGB,
    gl.UNSIGNED_BYTE,
    image
  );
  gl.generateMipmap(gl.TEXTURE_2D);
  gl.texParameteri(
    gl.TEXTURE_2D,
    gl.TEXTURE_MIN_FILTER,
    gl.NEAREST_MIPMAP_LINEAR
  );
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
}

function mesh() {
  pointsArray.push(vertices[0]);
  texCoordsArray.push(texCoord[0]);

  pointsArray.push(vertices[1]);
  texCoordsArray.push(texCoord[1]);

  pointsArray.push(vertices[2]);
  texCoordsArray.push(texCoord[2]);

  pointsArray.push(vertices[2]);
  texCoordsArray.push(texCoord[2]);

  pointsArray.push(vertices[3]);
  texCoordsArray.push(texCoord[3]);

  pointsArray.push(vertices[0]);
  texCoordsArray.push(texCoord[0]);
}

window.onload = function init() {
  canvas = document.getElementById("gl-canvas");

  gl = WebGLUtils.setupWebGL(canvas);
  if (!gl) {
    alert("WebGL isn't available");
  }

  gl.viewport(0, 0, canvas.width, canvas.height);
  gl.clearColor(1.0, 1.0, 1.0, 1.0);

  gl.enable(gl.DEPTH_TEST);

  //
  //  Load shaders and initialize attribute buffers
  //
  program = initShaders(gl, "vertex-shader", "fragment-shader");
  gl.useProgram(program);

  modelViewMatrix = lookAt(eye, at, up);
  projectionMatrix = ortho(-0.75, 0.75, -0.75, 0.75, -5.5, 5.5);

  var normalMatrix = mat4ToInverseMat3(modelViewMatrix);

  mesh();

  var vBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, vBuffer);
  gl.bufferData(gl.ARRAY_BUFFER, flatten(pointsArray), gl.STATIC_DRAW);

  var vPosition = gl.getAttribLocation(program, "vPosition");
  gl.vertexAttribPointer(vPosition, 4, gl.FLOAT, false, 0, 0);
  gl.enableVertexAttribArray(vPosition);

  var tBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, tBuffer);
  gl.bufferData(gl.ARRAY_BUFFER, flatten(texCoordsArray), gl.STATIC_DRAW);

  var vTexCoord = gl.getAttribLocation(program, "vTexCoord");
  gl.vertexAttribPointer(vTexCoord, 2, gl.FLOAT, false, 0, 0);
  gl.enableVertexAttribArray(vTexCoord);

  var normals = computeBumpMapNormals(data);
  configureTexture(normals);
  
  var diffuseProduct = mult(lightDiffuse, materialDiffuse);

  gl.uniform4fv(
    gl.getUniformLocation(program, "diffuseProduct"),
    flatten(diffuseProduct)
  );
  gl.uniform4fv(
    gl.getUniformLocation(program, "lightPosition"),
    flatten(lightPosition)
  );
  gl.uniform4fv(gl.getUniformLocation(program, "normal"), flatten(normal));
  gl.uniform3fv(gl.getUniformLocation(program, "objTangent"), flatten(tangent));

  gl.uniformMatrix4fv(
    gl.getUniformLocation(program, "modelViewMatrix"),
    false,
    flatten(modelViewMatrix)
  );
  gl.uniformMatrix4fv(
    gl.getUniformLocation(program, "projectionMatrix"),
    false,
    flatten(projectionMatrix)
  );
  gl.uniformMatrix3fv(
    gl.getUniformLocation(program, "normalMatrix"),
    false,
    flatten(normalMatrix)
  );

  render();
};

render = function() {
  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

  lightPosition[0] = 5.5 * Math.sin(0.01 * time);
  lightPosition[2] = 5.5 * Math.cos(0.01 * time);

  time += 1;

  gl.uniform4fv(
    gl.getUniformLocation(program, "lightPosition"),
    flatten(lightPosition)
  );

  gl.drawArrays(gl.TRIANGLES, 0, numVertices);

  requestAnimFrame(render);
};
!
999px

Console