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<!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);

    gl.blitFramebuffer(-1, -1, max, max, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
    gl.blitFramebuffer(0, 0, width, height, -1, -1, max, max, gl.COLOR_BUFFER_BIT, gl.NEAREST);
    gl.blitFramebuffer(-1, -1, max, max, -1, -1, max, max, gl.COLOR_BUFFER_BIT, gl.NEAREST);
    gl.blitFramebuffer(-max - 1, -max - 1, max, max, -max - 1, -max - 1, max, max, gl.COLOR_BUFFER_BIT, gl.NEAREST);

    testPassed("Congratulations! blitFramebuffer doesn't cause the browser crash when the computed width/height of src and/or dst region might overflow.");

    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>
