| <!-- |
| Copyright (c) 2021 The Khronos Group Inc. |
| Use of this source code is governed by an MIT-style license that can be |
| found in the LICENSE.txt file. |
| --> |
| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>Clear with scissor bug on WebGL canvas</title> |
| <link rel="stylesheet" href="../../resources/js-test-style.css"/> |
| <script src="../../js/js-test-pre.js"></script> |
| <script src="../../js/webgl-test-utils.js"></script> |
| </head> |
| <body> |
| <div id="description"></div> |
| <div id="console"></div> |
| <canvas id="canvas-webgl" width="20" height="20"> </canvas> |
| <canvas id="canvas-2d" width="20" height="20"> </canvas> |
| |
| <script> |
| "use strict"; |
| // This test exposes an issue in older Intel D3D drivers. |
| var wtu = WebGLTestUtils; |
| |
| function test_clear_with_scissor_on_canvas() |
| { |
| var canvasWebGL = document.getElementById("canvas-webgl"); |
| var gl = canvasWebGL.getContext("webgl", { antialias:false }); |
| const scissorRectSize = 16; |
| gl.enable(gl.SCISSOR_TEST); |
| gl.scissor(0, 0, scissorRectSize, scissorRectSize); |
| gl.clearColor(0, 1, 0, 1); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| |
| // The issue is found in the Chromium compositor so we need another canvas element for reproduction. |
| var canvas2D = document.getElementById("canvas-2d"); |
| var context2D = canvas2D.getContext('2d'); |
| context2D.drawImage(canvasWebGL, 0, 0); |
| context2D.fill(); |
| |
| var imageData = |
| context2D.getImageData(0, canvas2D.clientHeight - scissorRectSize, scissorRectSize, scissorRectSize); |
| var data = imageData.data; |
| var expectedColor = [0, 255, 0, 255]; |
| for (var pixelIndex = 0; pixelIndex < scissorRectSize * scissorRectSize; ++pixelIndex) { |
| for (var colorIndex = 0; colorIndex < 4; ++colorIndex) { |
| if (data[pixelIndex * 4 + colorIndex] !== expectedColor[colorIndex]) { |
| var y = Math.floor(pixelIndex / scissorRectSize); |
| var x = pixelIndex % scissorRectSize; |
| testFailed("The canvas color at (" + x + ", " + y + ") is not expected"); |
| return; |
| } |
| } |
| } |
| } |
| |
| test_clear_with_scissor_on_canvas(); |
| |
| description("Exposes clearing WebGL canvas with scissor bug on Intel D3D drivers - see https://crbug.com/1206763"); |
| var successfullyParsed = true; |
| |
| </script> |
| <script src="../../js/js-test-post.js"></script> |
| |
| </body> |
| </html> |
