dom/canvas/test/webgl-conf/checkout/conformance2/renderbuffers/multisampled-renderbuffer-initialization.html

   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 multisampled renderbuffers are initialized to 0 before being read in WebGL');
  23
  24 var gl = wtu.create3DContext("testbed", null, 2);
  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
  32     let c = gl.canvas;
  33     var maxSamples = gl.getInternalformatParameter(
  34         gl.RENDERBUFFER, gl.RGBA8, gl.SAMPLES)[0];
  35     for (let i = 0; i < 2; ++i) {
  36         runTest(gl, {alloc1: {w: c.width, h: c.height, s: maxSamples}, alloc2: null});
  37         runTest(gl, {alloc1: null, alloc2: {w: c.width, h: c.height, s: maxSamples}});
  38
  39         // Tests for initially allocating at the wrong size.
  40         // This is caused by a Qualcomm driver bug: http://crbug.com/696126
  41         runTest(gl, {alloc1: {w: 5, h: 5, s: maxSamples}, alloc2: {w: c.width, h: c.height, s: maxSamples}});
  42         runTest(gl, {alloc1: {w: 5, h: 5, s: maxSamples}, alloc2: {w: c.width, h: c.height, s: 0}});
  43         runTest(gl, {alloc1: {w: 5, h: 5, s: 0}, alloc2: {w: c.width, h: c.height, s: maxSamples}});
  44     }
  45
  46     // Testing buffer clearing won't change the clear values.
  47     var clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE);
  48     shouldBe("clearColor", "[0, 1, 0, 1]");
  49     wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
  50 }
  51
  52 function runTest(gl, params) {
  53     debug("Test for color buffer: " + JSON.stringify(params));
  54     let resolve = params.alloc2 ? params.alloc2 : params.alloc1;
  55     wtu.checkCanvasRect(gl, 0, 0, resolve.w, resolve.h,
  56                         [0, 0, 0, 0],
  57                         "internal buffers have been initialized to 0");
  58
  59     // fill the back buffer so we know that reading below happens from
  60     // the renderbuffer.
  61     gl.clear(gl.COLOR_BUFFER_BIT);
  62
  63     // Set up non-multisampled buffer to blit to and read back from.
  64     var fbo = gl.createFramebuffer();
  65     gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
  66     var buffer = gl.createRenderbuffer();
  67     gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
  68     gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA8, resolve.w, resolve.h);
  69     attachBuffer(buffer);
  70     shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)",
  71              "gl.FRAMEBUFFER_COMPLETE");
  72     wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
  73     gl.clear(gl.COLOR_BUFFER_BIT);
  74     wtu.checkCanvasRect(gl, 0, 0, resolve.w, resolve.h,
  75                         [0, 255, 0, 255],
  76                         "user buffer has been cleared to green");
  77
  78     // Set up multisampled buffer to test.
  79     var fbo_m = gl.createFramebuffer();
  80     gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_m);
  81     var buffer_m = gl.createRenderbuffer();
  82     gl.bindRenderbuffer(gl.RENDERBUFFER, buffer_m);
  83
  84     if (params.alloc1) {
  85         allocStorage(params.alloc1.w, params.alloc1.h, params.alloc1.s);
  86     }
  87     attachBuffer(buffer_m);
  88     if (params.alloc2) {
  89         if (params.alloc1) {
  90             // Clear the FBO in order to make sure framebufferRenderbuffer is
  91             // committed. (In Firefox, framebufferRenderbuffer is deferred, so
  92             // this is needed to trigger the bug.)
  93             gl.clear(gl.COLOR_BUFFER_BIT);
  94         }
  95         allocStorage(params.alloc2.w, params.alloc2.h, params.alloc2.s);
  96     }
  97
  98     function allocStorage(width, height, samples) {
  99         gl.renderbufferStorageMultisample(
 100             gl.RENDERBUFFER, samples, gl.RGBA8, width, height);
 101         wtu.glErrorShouldBe(gl, gl.NO_ERROR,
 102             "should be no error after renderbufferStorageMultisample(RGBA8).");
 103     }
 104
 105     function attachBuffer(buffer) {
 106         gl.framebufferRenderbuffer(
 107             gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, buffer);
 108         wtu.glErrorShouldBe(gl, gl.NO_ERROR,
 109             "should be no error after framebufferRenderbuffer.");
 110     }
 111
 112     shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)",
 113              "gl.FRAMEBUFFER_COMPLETE");
 114     wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
 115
 116     // Blit from multisampled buffer to non-multisampled buffer.
 117     gl.bindFramebuffer(gl.READ_FRAMEBUFFER, fbo_m);
 118     gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fbo);
 119     // Blit color from fbo_m (should be black) to fbo (should be green)
 120     gl.blitFramebuffer(0, 0, resolve.w, resolve.h,
 121                        0, 0, resolve.w, resolve.h,
 122                        gl.COLOR_BUFFER_BIT, gl.NEAREST);
 123     wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
 124
 125     gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
 126     wtu.checkCanvasRect(gl, 0, 0, resolve.w, resolve.h,
 127                         [0, 0, 0, 0],
 128                         "user buffer has been initialized to 0");
 129
 130     gl.deleteFramebuffer(fbo_m);
 131     gl.deleteRenderbuffer(buffer_m);
 132     gl.deleteFramebuffer(fbo);
 133     gl.deleteRenderbuffer(buffer);
 134
 135     // this clear should not matter we are about to resize
 136     gl.clear(gl.COLOR_BUFFER_BIT);
 137
 138     gl.canvas.width += 1;
 139     gl.canvas.height += 1;
 140
 141     wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
 142     debug('');
 143 }
 144
 145 var successfullyParsed = true;
 146 </script>
 147 <script src="../../js/js-test-post.js"></script>
 148 </body>
 149 </html>