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<!--
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">
<title>WebGL BlitFramebuffer Tests</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="example" width="8" height="8"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
var wtu = WebGLTestUtils;
description("This test verifies blitFramebuffer won't cause a crash when the computed sizes might overflow.");
var width = 8;
var height = 8;
var gl = wtu.create3DContext("example", undefined, 2);
if (!gl) {
testFailed("WebGL context does not exist");
} else {
testPassed("WebGL context exists");
blit_region_test();
}
function blit_region_test() {
debug("");
debug("Begin to run blitFramebuffer. The computed width/height of src and/or dst region might overflow during blitting.");
var tex0 = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex0);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
var fb0 = gl.createFramebuffer();
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, fb0);
gl.framebufferTexture2D(gl.READ_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex0, 0);
var tex1 = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex1);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
var fb1 = gl.createFramebuffer();
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fb1);
gl.framebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex1, 0);
if ((gl.checkFramebufferStatus(gl.READ_FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) ||
(gl.checkFramebufferStatus(gl.DRAW_FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE)) {
testFailed("Framebuffer incomplete.");
return;
}
var max = 0x7fffffff;
gl.blitFramebuffer(0, 0, max, max, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
gl.blitFramebuffer(0, 0, width, height, 0, 0, max, max, gl.COLOR_BUFFER_BIT, gl.NEAREST);
gl.blitFramebuffer(0, 0, max, max, 0, 0, max, max, gl.COLOR_BUFFER_BIT, gl.NEAREST);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Using max 32-bit integer as blitFramebuffer parameter should succeed.");
gl.blitFramebuffer(-1, -1, max - 1, max - 1, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
gl.blitFramebuffer(0, 0, width, height, -1, -1, max - 1, max - 1, gl.COLOR_BUFFER_BIT, gl.NEAREST);
gl.blitFramebuffer(-1, -1, max - 1, max - 1, -1, -1, max - 1, max - 1, gl.COLOR_BUFFER_BIT, gl.NEAREST);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Using blitFramebuffer parameters where calculated width/height matches max 32-bit integer should succeed.");
gl.blitFramebuffer(-1, -1, max, max, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Using source width/height greater than max 32-bit integer should fail.");
gl.blitFramebuffer(max, max, -1, -1, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Using source width/height greater than max 32-bit integer should fail.");
gl.blitFramebuffer(0, 0, width, height, -1, -1, max, max, gl.COLOR_BUFFER_BIT, gl.NEAREST);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Using destination width/height greater than max 32-bit integer should fail.");
gl.blitFramebuffer(0, 0, width, height, max, max, -1, -1, gl.COLOR_BUFFER_BIT, gl.NEAREST);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Using destination width/height greater than max 32-bit integer should fail.");
gl.blitFramebuffer(-1, -1, max, max, -1, -1, max, max, gl.COLOR_BUFFER_BIT, gl.NEAREST);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Using both source and destination width/height greater than max 32-bit integer should fail.");
gl.blitFramebuffer(-max - 1, -max - 1, max, max, -max - 1, -max - 1, max, max, gl.COLOR_BUFFER_BIT, gl.NEAREST);
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Using minimum and maximum integers for all boundaries should fail.");
gl.bindTexture(gl.TEXTURE_2D, null)
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, null);
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
gl.deleteTexture(tex0);
gl.deleteTexture(tex1);
gl.deleteFramebuffer(fb0);
gl.deleteFramebuffer(fb1);
}
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>