test_without_index_validation.html

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<!DOCTYPE html>

<html>

<head>

<meta charset='utf-8'>

<title>WebGL test: Drawing without index validation</title>

<script src='/tests/SimpleTest/SimpleTest.js'></script>

<link rel='stylesheet' href='/tests/SimpleTest/test.css'>

<script id='vertSource' type='none'>

void main(void) {

  gl_PointSize = 1.0;

  gl_Position = vec4(0, 0, 0, 1);

</script>

<script id='fragSource' type='none'>

precision mediump float;

void main(void) {

  gl_FragColor = vec4(0, 1, 0, 1);

</script>

</head>

<body>

<script>

function test() {

  const c = document.createElement('canvas');

  c.width = c.height = 1;

  const gl = c.getContext('webgl');

  if (!gl) {

    todo(false, 'WebGL is unavailable.');

    return;

  document.body.appendChild(c);

  const vs = gl.createShader(gl.VERTEX_SHADER);

  gl.shaderSource(vs, vertSource.innerHTML.trim());

  gl.compileShader(vs);

  const fs = gl.createShader(gl.FRAGMENT_SHADER);

  gl.shaderSource(fs, fragSource.innerHTML.trim());

  gl.compileShader(fs);

  const prog = gl.createProgram();

  gl.attachShader(prog, vs);

  gl.attachShader(prog, fs);

  gl.linkProgram(prog);

  gl.useProgram(prog);

  gl.clearColor(1,0,0,1);

  const pixel = new Uint32Array(1);

  const pixelData = new Uint8Array(pixel.buffer);

  function expectPixel(expected, info) {

    gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixelData);

    ok(pixel[0] == expected,

       '[' + info + '] Expected 0x' + expected.toString(16) + ', was 0x' + pixel[0].toString(16));

  gl.clear(gl.COLOR_BUFFER_BIT);

  expectPixel(0xFF0000FF, 'Clear');

  gl.drawArrays(gl.POINTS, 0, 1);

  expectPixel(0xFF00FF00, 'DrawArrays');

  const indexBuffer = gl.createBuffer();

  gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);

  gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([0]), gl.STATIC_DRAW);

  gl.clear(gl.COLOR_BUFFER_BIT);

  gl.drawElements(gl.POINTS, 1, gl.UNSIGNED_SHORT, 0);

  expectPixel(0xFF00FF00, 'DrawElements');

  SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

const prefArrArr = [

  ['webgl.force-index-validation', -1]

];

const prefEnv = {'set': prefArrArr};

SpecialPowers.pushPrefEnv(prefEnv, test);

</script>

</body>

</html>