canvas-no-clear-on-unsuccessful-draw.html (1684B)
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>Check that the canvas is NOT recomposited after unsucessful draw call</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 <style> 16 canvas { 17 border: 1px solid black; 18 } 19 .correct { 20 border: 1px solid black; 21 background-color: #00ff00; 22 } 23 </style> 24 </head> 25 <body> 26 <pre> 27 This test must be run manually. 28 29 This test tests that a canvas is NOT cleared 30 when a draw call fails. 31 32 You should see two <span class="correct">green rectangles</span> 33 with black outlines on success. 34 </pre> 35 <canvas id='c1'></canvas> 36 <canvas id='c2'></canvas> 37 <div id="console"></div> 38 <script> 39 "use strict"; 40 var wtu = WebGLTestUtils; 41 var c1 = document.getElementById("c1"); 42 var c2 = document.getElementById("c2"); 43 var gl1 = wtu.create3DContext(c1); 44 var gl2 = wtu.create3DContext(c2); 45 gl1.clearColor(0,1,0,1); 46 gl1.clear(gl1.COLOR_BUFFER_BIT); 47 gl2.clearColor(0,1,0,1); 48 gl2.clear(gl2.COLOR_BUFFER_BIT); 49 wtu.waitForComposite(function() { 50 gl1.drawArrays(gl1.BLEND, 0, 0); 51 wtu.glErrorShouldBe(gl1, gl1.INVALID_ENUM, "no errors"); 52 }); 53 54 wtu.waitForComposite(function() { 55 var buf = gl2.createBuffer(); 56 gl2.bindBuffer(gl2.ELEMENT_ARRAY_BUFFER, buf); 57 gl2.bufferData(gl2.ELEMENT_ARRAY_BUFFER, new Uint8Array(1), gl2.STATIC_DRAW); 58 gl2.drawElements(gl2.BLEND, 0, gl2.UNSIGNED_SHORT, 0); 59 wtu.glErrorShouldBe(gl2, gl2.INVALID_ENUM, "no errors"); 60 }); 61 </script> 62 </body> 63 </html>