dom/canvas/test/webgl-conf/checkout/conformance/buffers/buffer-data-dynamic-delay.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 <title>bufferData with DYNAMIC_DRAW and delay between updating data</title>
  12 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  13 <script src="../../js/js-test-pre.js"></script>
  14 <script src="../../js/webgl-test-utils.js"> </script>
  15 </head>
  16 <body>
  17 <canvas id="canvas" width="50" height="50"></canvas>
  18 <div id="description"></div>
  19 <div id="console"></div>
  20
  21 <script id="vshader" type="x-shader/x-vertex">
  22     attribute vec2 a_position;
  23     attribute vec2 a_color;
  24     varying vec2 v_color;
  25     void main()
  26     {
  27         gl_Position = vec4(a_position, 0.0, 1.0);
  28         v_color = a_color;
  29     }
  30 </script>
  31 <script id="fshader" type="x-shader/x-fragment">
  32     precision mediump float;
  33     varying vec2 v_color;
  34     void main()
  35     {
  36         gl_FragColor = vec4(v_color, 0.0, 1.0);
  37     }
  38 </script>
  39
  40 <script>
  41 "use strict";
  42 description("Verifies that bufferData with DYNAMIC_DRAW updates the vertex attribute when there is a significant delay between updating the buffer.");
  43 var wtu = WebGLTestUtils;
  44 var gl = wtu.create3DContext("canvas");
  45 var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_position", "a_color"]);
  46
  47 // Initialize position vertex attribute to draw a square covering the entire canvas.
  48 var positionBuffer = gl.createBuffer();
  49 gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
  50 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
  51     -1.0,  1.0,
  52      1.0,  1.0,
  53     -1.0, -1.0,
  54      1.0, -1.0
  55     ]), gl.DYNAMIC_DRAW);
  56 gl.enableVertexAttribArray(0);
  57 gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
  58
  59 // Initialize color vertex attribute to red.
  60 var colorBuffer = gl.createBuffer();
  61 gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
  62 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
  63     1.0, 0.0,
  64     1.0, 0.0,
  65     1.0, 0.0,
  66     1.0, 0.0,
  67     ]), gl.DYNAMIC_DRAW);
  68 gl.enableVertexAttribArray(1);
  69 gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
  70
  71 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No error after setup");
  72
  73 // Fill the canvas with red
  74 gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
  75 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No error after first drawArrays");
  76
  77 wtu.checkCanvasRect(gl, 0, 0, 50, 50, [255, 0, 0, 255], "Canvas should be red after the first drawArrays");
  78
  79 // With the buffer set to DYNAMIC_DRAW, Angle internally changes the storage type of the vertex attribute from DYNAMIC to DIRECT
  80 // if the buffer has not been updated after ~4-5 draw calls. When the buffer is eventually updated, the vertex attribute
  81 // is updated back to DYNAMIC, but there was a bug in Angle where the data is not marked as dirty. The result is that the
  82 // vertex data is not updated with the new buffer data. This test verifies that the vertex data is updated.
  83 var iteration = 0;
  84 function draw() {
  85     // Draw 10 times to ensure that the vertex attribute storage type is changed.
  86     if (iteration < 10) {
  87         gl.drawArrays(gl.TRIANGLE_STRIP, 0, 2);
  88         requestAnimationFrame(draw);
  89     }
  90     else {
  91         // Update the buffer bound to the color vertex attribute to green and draw.
  92         gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
  93         gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
  94             0.0, 1.0,
  95             0.0, 1.0,
  96             0.0, 1.0,
  97             0.0, 1.0,
  98             ]), gl.DYNAMIC_DRAW);
  99         gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
 100         wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No error after last drawArrays");
 101
 102         wtu.checkCanvasRect(gl, 0, 0, 50, 50, [0, 255, 0, 255], "Canvas should be green after 10 frames");
 103
 104         finishTest();
 105     }
 106
 107     iteration++;
 108 }
 109
 110 requestAnimationFrame(draw);
 111
 112 </script>
 113 </body>
 114 </html>