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Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/context/context-no-alpha-fbo-with-alpha.html')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/context/context-no-alpha-fbo-with-alpha.html | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/context/context-no-alpha-fbo-with-alpha.html b/dom/canvas/test/webgl-conf/checkout/conformance/context/context-no-alpha-fbo-with-alpha.html new file mode 100644 index 0000000000..81fc80ee5f --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/context/context-no-alpha-fbo-with-alpha.html @@ -0,0 +1,77 @@ +<!-- +Copyright (c) 2019 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"> +<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> + +<script> +"use strict"; + +var wtu = WebGLTestUtils; + +// This declaration needs to be global for "shouldBe" to see it +var gl; + +function init() +{ + description('Verify that a WebGL context with alpha:false still works correctly after handling textures with an alpha channel.'); + + runTest(); +} + +function getWebGL(contextAttribs) +{ + return wtu.create3DContext("c", contextAttribs); +} + +function runTest() +{ + var buf = new Uint8Array(1 * 1 * 4); + shouldBeNonNull("gl = getWebGL({ alpha: false, antialias: false })"); + + // Clear to black. Alpha channel of clearColor() is ignored. + gl.clearColor(0.0, 0.0, 0.0, 0.7); + gl.clear(gl.COLOR_BUFFER_BIT); + wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 0, 0, 255], + "Alpha channel of clearColor should be ignored"); + + wtu.waitForComposite(function() { + // Make a new framebuffer and attach a texture with an alpha channel. + var fbo = gl.createFramebuffer(); + gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); + var texture = gl.createTexture(); + gl.bindTexture(gl.TEXTURE_2D, texture); + gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null); + gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0); + + // Clear texture. Note that alpha channel is not 1.0. + gl.clearColor(1.0, 0.0, 0.0, 0.5); + gl.clear(gl.COLOR_BUFFER_BIT); + wtu.checkCanvasRect(gl, 0, 0, 1, 1, [255, 0, 0, 128], + "Alpha channel of clearColor should be obeyed for FBO with alpha channel", + 1); + + // Bind back buffer and check that its alpha channel is still 1.0. + gl.bindFramebuffer(gl.FRAMEBUFFER, null); + wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 0, 0, 255], + "Alpha channel of back buffer should still be 255"); + finishTest(); + }); +} + +</script> +</head> +<body onload="init()"> +<div id="description"></div> +<div id="console"></div> +<canvas width="20" height="20" style="border: 1px solid blue;" id="c"></canvas> +</body> +</html> |