gecko/content/canvas/test/webgl/conformance/uninitialized-test.html

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<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>WebGL Uninitialized GL Resources Tests</title>
<link rel="stylesheet" href="../resources/js-test-style.css"/>
<script src="../resources/js-test-pre.js"></script>
<script src="resources/webgl-test.js"></script>
<script src="resources/testrunner.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<canvas id="canvas" width="2" height="2"> </canvas>
<script><!--
description("Tests to check user code cannot access uninitialized data from GL resources.");
var canvas = document.getElementById("canvas");
var gl = create3DContext(canvas);
if (!gl)
testFailed("Context created.");
else
testPassed("Context created.");
/* object containing all tests in this testsuite */
var uninitializedTests = {
"Reading an uninitialized texture should succeed with all bytes set to 0." : function () {
this._width = 512;
this._height = 512;
this._bpp = 4;
this._expectedDataLength = this._width*this._height*this._bpp;
this.setup = function () {
var tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, this._width, this._height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
// this can be quite undeterministic so to improve odds of seeing uninitialized data write bits
// into tex then delete texture then re-create one with same characteristics (driver will likely reuse mem)
// with this trick on r59046 WebKit/OSX I get FAIL 100% of the time instead of ~15% of the time.
var badData = new WebGLUnsignedByteArray(this._expectedDataLength);
for (var i = 0; i < badData.length; ++i) badData[i] = i % 255;
gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, this._width, this._height, gl.RGBA, gl.UNSIGNED_BYTE, badData);
gl.finish(); // make sure it has been uploaded
gl.deleteTexture(tex);
gl.finish(); // make sure it has been deleted
var tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, this._width, this._height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
var fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
this.data = gl.readPixels(0, 0, this._width, this._height, gl.RGBA, gl.UNSIGNED_BYTE);
};
this.expects = function () {
if (this.data.length !== this._expectedDataLength) {
debug("expected data length " + this._expectedDataLength + " but got " + this.data.length + " instead.");
return false;
}
for (var i = 0; i < this.data.length; ++i)
if (0 !== this.data[i]) {
debug("byte at offset " + i + " has value " + this.data[i]);
return false;
}
return true;
};
}
//TODO: uninitialized vertex array buffer
//TODO: uninitialized vertex elements buffer
//TODO: uninitialized framebuffer? (implementations would need to do a GL clear at first binding?)
//TODO: uninitialized renderbuffer? (implementations would need to do a GL clear at first binding?)
//TODO: uninitialized uniform arrays?
}
runTestsuite(uninitializedTests);
debug("");
successfullyParsed = true;
--></script>
<script src="../resources/js-test-post.js"></script>
<script>
</script>
</body>
</html>