<!--
/*
** Copyright (c) 2012 The Khronos Group Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and/or associated documentation files (the
** "Materials"), to deal in the Materials without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Materials, and to
** permit persons to whom the Materials are furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be included
** in all copies or substantial portions of the Materials.
**
** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
*/
-->
<!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 verifies the correct number of indices");

function sizeInBytes(type) {
  switch (type) {
  case gl.BYTE:
  case gl.UNSIGNED_BYTE:
    return 1;
  case gl.SHORT:
  case gl.UNSIGNED_SHORT:
    return 2;
  case gl.INT:
  case gl.UNSIGNED_INT:
  case gl.FLOAT:
    return 4;
  default:
    throw "unknown type";
  }
}

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

// 3 vertices => 1 triangle, interleaved data
var dataComplete = new Float32Array([0, 0, 0, 1,
                                     0, 0, 1,
                                     1, 0, 0, 1,
                                     0, 0, 1,
                                     1, 1, 1, 1,
                                     0, 0, 1]);
var dataIncomplete = new Float32Array([0, 0, 0, 1,
                                       0, 0, 1,
                                       1, 0, 0, 1,
                                       0, 0, 1,
                                       1, 1, 1, 1]);
var indices = new Uint16Array([0, 1, 2]);

debug("Testing with valid indices");

var bufferComplete = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, bufferComplete);
gl.bufferData(gl.ARRAY_BUFFER, dataComplete, gl.STATIC_DRAW);
var elements = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elements);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
gl.useProgram(program);
var vertexLoc = gl.getAttribLocation(program, "a_vertex");
var normalLoc = gl.getAttribLocation(program, "a_normal");
gl.vertexAttribPointer(vertexLoc, 4, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 0);
gl.enableVertexAttribArray(vertexLoc);
gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
gl.enableVertexAttribArray(normalLoc);
shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
wtu.glErrorShouldBe(gl, gl.NO_ERROR);

debug("Testing with out-of-range indices");

var bufferIncomplete = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, bufferIncomplete);
gl.bufferData(gl.ARRAY_BUFFER, dataIncomplete, gl.STATIC_DRAW);
gl.vertexAttribPointer(vertexLoc, 4, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 0);
gl.enableVertexAttribArray(vertexLoc);
gl.disableVertexAttribArray(normalLoc);
debug("Enable vertices, valid");
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
debug("Enable normals, out-of-range");
gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
gl.enableVertexAttribArray(normalLoc);
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
wtu.glErrorShouldBe(gl, [gl.INVALID_OPERATION, gl.NO_ERROR]);

debug("Test with enabled attribute that does not belong to current program");

gl.disableVertexAttribArray(normalLoc);
var extraLoc = Math.max(vertexLoc, normalLoc) + 1;
gl.enableVertexAttribArray(extraLoc);
debug("Enable an extra attribute with null");
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION);
debug("Enable an extra attribute with insufficient data buffer");
gl.vertexAttribPointer(extraLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
debug("Pass large negative index to vertexAttribPointer");
gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), -2000000000 * sizeInBytes(gl.FLOAT));
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');

var successfullyParsed = true;
</script>

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