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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL buffer overflow test for bindBufferRange</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>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("WebGL buffer overflow test: buffer overflow will not lead to failure in bindBufferRange");

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext(undefined, undefined, 2);

debug("");
var buffer1 = gl.createBuffer();
gl.bindBufferRange(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buffer1, 0, 4);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
    "Calling bindBufferRange on a buffer where no storage is allocated should succeed.");
shouldBe("buffer1", "gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)");
shouldBe("4", "gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_SIZE, 0)");
shouldBe("0", "gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_START, 0)");

var buffer2 = gl.createBuffer();
gl.bindBuffer(gl.UNIFORM_BUFFER, buffer2);
gl.bufferData(gl.UNIFORM_BUFFER, 4, gl.STATIC_DRAW);
gl.bindBufferRange(gl.UNIFORM_BUFFER, 1, buffer2, 0, 8);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
    "Calling bindBufferRange on a buffer where the storage is not big enough should succeed.");
shouldBe("buffer2", "gl.getIndexedParameter(gl.UNIFORM_BUFFER_BINDING, 1)");
shouldBe("8", "gl.getIndexedParameter(gl.UNIFORM_BUFFER_SIZE, 1)");
shouldBe("0", "gl.getIndexedParameter(gl.UNIFORM_BUFFER_START, 1)");

debug("");
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
