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<!--
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>
|
