tor-browser

The Tor Browser
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stencil-renderbuffer-initialization.html (4795B)

      1 <!--
      2 Copyright (c) 2019 The Khronos Group Inc.
      3 Use of this source code is governed by an MIT-style license that can be
      4 found in the LICENSE.txt file.
      5 -->
      6 
      7 <!DOCTYPE html>
      8 <html>
      9 <head>
     10 <meta charset="utf-8">
     11 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
     12 <script src="../../js/js-test-pre.js"></script>
     13 <script src="../../js/webgl-test-utils.js"></script>
     14 </head>
     15 <body>
     16 <canvas id="testbed" width="40" height="40" style="width: 40px; height: 40px;"></canvas>
     17 <div id="description"></div>
     18 <div id="console"></div>
     19 <script>
     20 "use strict";
     21 var wtu = WebGLTestUtils;
     22 description('Verify stencil renderbuffers are initialized to 0 before being read in WebGL');
     23 
     24 var gl = wtu.create3DContext("testbed");
     25 
     26 if (!gl) {
     27    testFailed('canvas.getContext() failed');
     28 } else {
     29    // Set the clear color to green. It should never show up.
     30    gl.clearColor(0, 1, 0, 1);
     31    gl.disable(gl.DEPTH_TEST);
     32    gl.disable(gl.STENCIL_TEST);
     33 
     34    let c = gl.canvas;
     35    for (let i = 0; i < 2; ++i) {
     36        runTest(gl, {alloc1: {w: c.width, h: c.height}, alloc2: null});
     37        runTest(gl, {alloc1: null, alloc2: {w: c.width, h: c.height}});
     38        // Tests for initially allocating at the wrong size.
     39        runTest(gl, {alloc1: {w: 5, h: 5}, alloc2: {w: c.width, h: c.height}});
     40    }
     41 
     42    // Testing buffer clearing won't change the clear values.
     43    var clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE);
     44    shouldBe("clearColor", "[0, 1, 0, 1]");
     45    wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
     46 }
     47 
     48 function runTest(gl, params) {
     49    debug("Test for stencil buffer: " + JSON.stringify(params));
     50    let final = params.alloc2 ? params.alloc2 : params.alloc1;
     51    gl.viewport(0, 0, final.w, final.h);
     52    wtu.checkCanvasRect(gl, 0, 0, final.w, final.h,
     53                        [0, 0, 0, 0],
     54                        "internal buffers have been initialized to 0");
     55 
     56    gl.disable(gl.STENCIL_TEST);
     57 
     58    // fill the back buffer so we know that reading below happens from
     59    // the renderbuffer.
     60    gl.clearStencil(2);
     61    gl.clear(gl.COLOR_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
     62 
     63    // Set up (color+stencil) test buffer.
     64    var fbo = gl.createFramebuffer();
     65    gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
     66    var buffer = gl.createRenderbuffer();
     67    var stencilBuffer = gl.createRenderbuffer();
     68 
     69    if (params.alloc1) {
     70        gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
     71        allocStorage(gl.RGBA4, params.alloc1.w, params.alloc1.h);
     72        gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
     73        allocStorage(gl.STENCIL_INDEX8, params.alloc1.w, params.alloc1.h);
     74    }
     75    gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
     76    gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, buffer);
     77    gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
     78    gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, stencilBuffer);
     79    if (params.alloc2) {
     80        if (params.alloc1) {
     81            if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
     82                debug("Skip: framebuffer is allowed to be incomplete.");
     83                return;
     84            }
     85            // Clear the FBO in order to make sure framebufferRenderbuffer is
     86            // committed.
     87            gl.clear(gl.COLOR_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
     88        }
     89        gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
     90        allocStorage(gl.RGBA4, params.alloc2.w, params.alloc2.h);
     91        gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
     92        allocStorage(gl.STENCIL_INDEX8, params.alloc2.w, params.alloc2.h);
     93    }
     94 
     95    function allocStorage(format, width, height) {
     96        gl.renderbufferStorage(gl.RENDERBUFFER, format, width, height);
     97        wtu.glErrorShouldBe(gl, gl.NO_ERROR,
     98            "should be no error after renderbufferStorage.");
     99    }
    100 
    101    if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
    102        debug("Skip: framebuffer is allowed to be incomplete.");
    103        return;
    104    }
    105    wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
    106 
    107    // fbo depth should now be the default value of 0.
    108 
    109    // Draw a blue quad (stencil = 1) (should pass the stencil test: 1 > 0)
    110    gl.stencilFunc(gl.GREATER, 1, 0xffffffff);
    111    gl.enable(gl.STENCIL_TEST);
    112    wtu.setupColorQuad(gl);
    113    wtu.setFloatDrawColor(gl, [0, 0, 1, 1]);
    114    wtu.drawUnitQuad(gl);
    115    wtu.checkCanvasRect(gl, 0, 0, final.w, final.h,
    116                        [0, 0, 255, 255]);
    117 
    118    gl.deleteFramebuffer(fbo);
    119    gl.deleteRenderbuffer(buffer);
    120 
    121    gl.canvas.width += 1;
    122    gl.canvas.height += 1;
    123 
    124    wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
    125    debug('');
    126 }
    127 
    128 var successfullyParsed = true;
    129 </script>
    130 <script src="../../js/js-test-post.js"></script>
    131 </body>
    132 </html>