tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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test_tex_pbo.html (2694B)

      1 <!DOCTYPE HTML>
      2 <html>
      3  <head>
      4    <meta charset='UTF-8'>
      5    <script src='/tests/SimpleTest/SimpleTest.js'></script>
      6    <link rel='stylesheet' href='/tests/SimpleTest/test.css'>
      7  </head>
      8  <body>
      9    <script>
     10 
     11 function shouldBe(testStr, refStr) {
     12  ok(testStr == refStr, 'Expected "' + refStr + '", was "' + testStr + '".');
     13 }
     14 
     15 function getErrorStr(gl, err) {
     16  if (!err) return "NO_ERROR";
     17  for (const k in gl) {
     18    const v = gl[k];
     19    if (v == err) {
     20      return k;
     21    }
     22  }
     23  return `<${err}>`;
     24 }
     25 
     26 function glErrorShouldBe(gl, expected, opt_info) {
     27  if (opt_info) {
     28    opt_info = opt_info + ': '
     29  } else {
     30    opt_info = '';
     31  }
     32 
     33  if (!expected.length) {
     34    expected = [expected];
     35  }
     36  expected = expected.map(x => getErrorStr(gl, x));
     37  let was = gl.getError();
     38  was = getErrorStr(gl, was);
     39  console.log(expected);
     40  ok(expected.includes(was),
     41    `${opt_info}Expected gl.getError() in [${expected}], was ${was}.`);
     42 }
     43 
     44 (() => {
     45  const gl = document.createElement('canvas').getContext('webgl2');
     46  if (!gl) {
     47    todo(false, 'No webgl2, skipping...');
     48    return;
     49  }
     50  const pbo = gl.createBuffer();
     51  gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, pbo);
     52 
     53  const PBO_DATA = new Uint8Array([
     54    255, 0, 0, 255,
     55    0, 255, 0, 255,
     56  ]);
     57  gl.bufferData(gl.PIXEL_UNPACK_BUFFER, PBO_DATA, gl.STATIC_DRAW);
     58 
     59  const tex = gl.createTexture();
     60  gl.bindTexture(gl.TEXTURE_2D, tex);
     61 
     62  const fb = gl.createFramebuffer();
     63  gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     64  gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
     65 
     66  const readback = new Uint8Array(4);
     67 
     68  const PBO_LIST = [null, pbo];
     69  for (const cur of PBO_LIST) {
     70    gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, cur);
     71 
     72    function tryUpload(arg, expectedReadback) {
     73      let argType = typeof(arg);
     74      if (arg === null) {
     75        argType = 'null';
     76      }
     77      const argForPbo = (argType == 'number');
     78      const pboBound = !!cur;
     79      const expectedErr = (argForPbo == pboBound) ? 0 : gl.INVALID_OPERATION;
     80      gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE,
     81                    arg);
     82      const with_without = pboBound ? 'with' : 'without';
     83      glErrorShouldBe(gl, expectedErr, `${with_without} pbo, texImage(..., ${argType}("${arg}"))`);
     84 
     85      if (expectedErr) return;
     86      gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, readback);
     87      shouldBe(expectedReadback.toString(), readback.toString());
     88    }
     89 
     90    const CPU_DATA = new Uint8Array([255, 255, 0, 255]);
     91 
     92    tryUpload(null, [0,0,0,0]);
     93    tryUpload(CPU_DATA, CPU_DATA);
     94    tryUpload(0, PBO_DATA.slice(0,4));
     95    tryUpload(4, PBO_DATA.slice(4));
     96  }
     97 })();
     98    </script>
     99  </body>
    100 </html>