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31 <meta charset="utf-8">
32 <title>Verifies that GL framebuffer bindings do not change when canvas is resized</title>
33 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
34 <script src="../../resources/js-test-pre.js"></script>
35 <script src="../resources/webgl-test-utils.js"></script>
38 <canvas id="example" width="4" height="4"></canvas>
39 <div id="description"></div>
40 <div id="console"></div>
43 enableJSTestPreVerboseLogging();
44 description("Verifies that GL framebuffer bindings do not change when canvas is resized");
47 var wtu = WebGLTestUtils;
48 var canvas = document.getElementById("example");
49 var gl = wtu.create3DContext(canvas);
50 var green = [0, 255, 0, 255];
51 var blue = [0, 0, 255, 255];
53 shouldBeTrue("fboSize < canvas.width");
54 var fbo = gl.createFramebuffer();
55 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
56 var fboTex = gl.createTexture();
57 gl.activeTexture(gl.TEXTURE1);
58 gl.bindTexture(gl.TEXTURE_2D, fboTex);
59 gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, fboTex, 0);
60 gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, fboSize, fboSize, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
61 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
62 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
63 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
64 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
65 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
67 function checkFBO(color, msg) {
68 wtu.checkCanvasRect(gl, 0, 0, fboSize, fboSize, color, msg);
69 wtu.checkCanvasRect(gl, fboSize, fboSize, fboSize, fboSize, [0, 0, 0, 0], "area outside fbo should be transparent black");
72 // The FBO is 2x2 and it's bound so clearing should clear a 2x2 area
73 // and calling read pixels should read the clear color in that 2x2 area
74 // and 0,0,0,0 outside that area.
76 // If the FBO is no longer bound because of a WebGL implementation error
77 // then likely the clear will clear the backbuffer and reading outside
78 // the 2x2 area will not be 0,0,0,0
81 gl.clearColor(0, 0, 1, 1);
82 gl.clear(gl.COLOR_BUFFER_BIT);
83 checkFBO(blue, "should be blue");
84 gl.clearColor(0, 1, 0, 1);
85 gl.clear(gl.COLOR_BUFFER_BIT);
86 checkFBO(green, "should be green");
89 debug("test before resizing canvas");
91 debug("test after resizing canvas");
94 debug("test after resizing canvas and waiting for compositing");
96 wtu.waitForComposite(gl, function() {
99 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors.");
102 var successfullyParsed = true;