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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<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('Tests that index validation for drawElements does not examine too many indices');

var wtu = WebGLTestUtils;
var context = wtu.create3DContext();
var program = wtu.loadStandardProgram(context);

context.useProgram(program);
var vertexObject = context.createBuffer();
context.enableVertexAttribArray(0);
context.bindBuffer(context.ARRAY_BUFFER, vertexObject);
// 4 vertices -> 2 triangles
context.bufferData(context.ARRAY_BUFFER, new Float32Array([ 0,0,0, 0,1,0, 1,0,0, 1,1,0 ]), context.STATIC_DRAW);
context.vertexAttribPointer(0, 3, context.FLOAT, false, 0, 0);

var indexObject = context.createBuffer();

debug("Test out of range indices")
context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, indexObject);
context.bufferData(context.ELEMENT_ARRAY_BUFFER, new Uint16Array([ 10000, 0, 1, 2, 3, 10000 ]), context.STATIC_DRAW);
var indexValidationError = wtu.shouldGenerateGLError(context, [context.INVALID_OPERATION, context.NO_ERROR], "context.drawElements(context.TRIANGLE_STRIP, 4, context.UNSIGNED_SHORT, 0)");
wtu.shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLE_STRIP, 4, context.UNSIGNED_SHORT, 2)");
wtu.shouldGenerateGLError(context, indexValidationError, "context.drawElements(context.TRIANGLE_STRIP, 4, context.UNSIGNED_SHORT, 4)");

debug("")
var successfullyParsed = true;
</script>

<script src="../../js/js-test-post.js"></script>
</body>
</html>
