| <!-- |
| 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>WebGL ColorMask Should Not Affect Antialiased Framebuffer Resolution</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> |
| <canvas id="canvas" width="8" height="8"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| |
| <script> |
| "use strict"; |
| |
| const wtu = WebGLTestUtils; |
| description("This test verifies that the colorMask state does not affect resolution of the antialiased framebuffer."); |
| |
| debug('Regression test for <a href="https://crbug.com/1257769">https://crbug.com/1257769</a> and <a href="https://bugs.webkit.org/show_bug.cgi?id=220129">https://bugs.webkit.org/show_bug.cgi?id=220129</a>'); |
| |
| function run() { |
| const gl = wtu.create3DContext("canvas", { antialias: true, alpha: true }); |
| |
| if (!gl) { |
| testFailed("WebGL context does not exist"); |
| finishTest(); |
| return; |
| } |
| |
| testPassed("WebGL context exists"); |
| |
| const program = wtu.setupColorQuad(gl); |
| |
| // Clear the default (multisampled) framebuffer to red. |
| gl.clearColor(1, 0, 0, 1); |
| gl.colorMask(true, true, true, true); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| |
| // Draw a transparent green quad. |
| gl.useProgram(program); |
| wtu.drawFloatColorQuad(gl, [ 0, 255, 0, 0 ]); |
| |
| // Clear the alpha channel. |
| gl.colorMask(false, false, false, true); |
| gl.clearColor(0, 0, 0, 1); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| |
| // At this point, even setting the colorMask to all-true won't |
| // work around the bug, since that state is latched inside ANGLE |
| // only during draws / clears. |
| |
| wtu.checkCanvas(gl, [ 0, 255, 0, 255 ], "should be green", 1); |
| finishTest(); |
| } |
| |
| var successfullyParsed = true; |
| |
| requestAnimationFrame(run); |
| |
| </script> |
| |
| </body> |
| </html> |
