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<!DOCTYPE html>
<html>
<head>
<meta 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/webgl-test-utils.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 wtu = WebGLTestUtils;
var gl = wtu.create3DContext("canvas");
if (!gl)
testFailed("Context created.");
else
testPassed("Context created.");
function setupTexture(texWidth, texHeight) {
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, texWidth, texHeight, 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 Uint8Array(texWidth * texHeight * 4);
for (var i = 0; i < badData.length; ++i)
badData[i] = i % 255;
gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, texWidth, texHeight, gl.RGBA, gl.UNSIGNED_BYTE, badData);
gl.finish(); // make sure it has been uploaded
gl.deleteTexture(texture);
gl.finish(); // make sure it has been deleted
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
return texture;
}
function checkNonZeroPixels(texture, texWidth, texHeight, skipX, skipY, skipWidth, skipHeight, skipR, skipG, skipB, skipA) {
gl.bindTexture(gl.TEXTURE_2D, null);
var fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
var data = new Uint8Array(texWidth * texHeight * 4);
gl.readPixels(0, 0, texWidth, texHeight, gl.RGBA, gl.UNSIGNED_BYTE, data);
var k = 0;
for (var y = 0; y < texHeight; ++y) {
for (var x = 0; x < texWidth; ++x) {
var index = (y * texWidth + x) * 4;
if (x >= skipX && x < skipX + skipWidth && y >= skipY && y < skipY + skipHeight) {
if (data[index] != skipR || data[index + 1] != skipG || data[index + 2] != skipB || data[index + 3] != skipA) {
testFailed("non-zero pixel values are wrong at (" + x + ", " + y + "), data was (" +
data[index] + "," + data[index + 1] + "," + data[index + 2] + "," + data[index + 3] +
") should have been (" + skipR + "," + skipG + "," + skipB + "," + skipA + ")");
return;
}
} else {
for (var i = 0; i < 4; ++i) {
if (data[index + i] != 0)
k++;
}
}
}
}
if (k) {
testFailed("Found " + k + " non-zero bytes");
} else {
testPassed("All data initialized");
}
}
var width = 512;
var height = 512;
debug("");
debug("Reading an uninitialized texture (texImage2D) should succeed with all bytes set to 0.");
var tex = setupTexture(width, height);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
checkNonZeroPixels(tex, width, height, 0, 0, 0, 0, 0, 0, 0, 0);
gl.deleteTexture(tex);
gl.finish();
glErrorShouldBe(gl, gl.NO_ERROR);
debug("");
debug("Reading an uninitialized portion of a texture (copyTexImage2D) should succeed with all bytes set to 0.");
var tex = setupTexture(width, height);
var fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
var rbo = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
var fboWidth = 16;
var fboHeight = 16;
gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, fboWidth, fboHeight);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
gl.clearColor(1.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
glErrorShouldBe(gl, gl.NO_ERROR);
gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, width, height, 0);
checkNonZeroPixels(tex, width, height, 0, 0, fboWidth, fboHeight, 255, 0, 0, 255);
gl.deleteTexture(tex);
gl.finish();
glErrorShouldBe(gl, gl.NO_ERROR);
debug("");
debug("Reading an uninitialized portion of a texture (copyTexImage2D with negative x and y) should succeed with all bytes set to 0.");
var tex = setupTexture(width, height);
var fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
var rbo = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
var fboWidth = 16;
var fboHeight = 16;
gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, fboWidth, fboHeight);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
gl.clearColor(1.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
glErrorShouldBe(gl, gl.NO_ERROR);
var x = -8;
var y = -8;
gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, x, y, width, height, 0);
checkNonZeroPixels(tex, width, height, -x, -y, fboWidth, fboHeight, 255, 0, 0, 255);
gl.deleteTexture(tex);
gl.finish();
glErrorShouldBe(gl, gl.NO_ERROR);
debug("");
debug("Reading an uninitialized portion of a texture (copyTexImage2D from WebGL internal fbo) should succeed with all bytes set to 0.");
var tex = setupTexture(width, height);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.clearColor(0.0, 1.0, 0.0, 0.0);
gl.clear(gl.COLOR_BUFFER_BIT);
glErrorShouldBe(gl, gl.NO_ERROR);
gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, width, height, 0);
checkNonZeroPixels(tex, width, height, 0, 0, gl.canvas.width, gl.canvas.height, 0, 255, 0, 0);
gl.deleteTexture(tex);
gl.finish();
glErrorShouldBe(gl, gl.NO_ERROR);
//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?
debug("");
successfullyParsed = true;
</script>
<script>finishTest();</script>
</body>
</html>
|
