1/*
2 * Copyright (C) 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28
29#if ENABLE(3D_CANVAS)
30
31#include "WebGLArrayBuffer.h"
32#include "WebGLUnsignedShortArray.h"
33
34namespace WebCore {
35
36PassRefPtr<WebGLUnsignedShortArray> WebGLUnsignedShortArray::create(unsigned length)
37{
38    RefPtr<WebGLArrayBuffer> buffer = WebGLArrayBuffer::create(length * sizeof(unsigned short));
39    return create(buffer, 0, length);
40}
41
42PassRefPtr<WebGLUnsignedShortArray> WebGLUnsignedShortArray::create(unsigned short* array, unsigned length)
43{
44    RefPtr<WebGLUnsignedShortArray> a = WebGLUnsignedShortArray::create(length);
45    for (unsigned i = 0; i < length; ++i)
46        a->set(i, array[i]);
47    return a;
48}
49
50PassRefPtr<WebGLUnsignedShortArray> WebGLUnsignedShortArray::create(PassRefPtr<WebGLArrayBuffer> buffer,
51                                                                    int byteOffset,
52                                                                    unsigned length)
53{
54    // Make sure the offset results in valid alignment.
55    if ((byteOffset % sizeof(unsigned short)) != 0) {
56        return NULL;
57    }
58
59    if (buffer) {
60        // Check to make sure we are talking about a valid region of
61        // the given WebGLArrayBuffer's storage.
62        if ((byteOffset + (length * sizeof(unsigned short))) > buffer->byteLength())
63            return NULL;
64    }
65
66    return adoptRef(new WebGLUnsignedShortArray(buffer, byteOffset, length));
67}
68
69WebGLUnsignedShortArray::WebGLUnsignedShortArray(PassRefPtr<WebGLArrayBuffer> buffer,
70                                                 int byteOffset,
71                                                 unsigned length)
72        : WebGLArray(buffer, byteOffset)
73        , m_size(length)
74{
75}
76
77unsigned WebGLUnsignedShortArray::length() const {
78    return m_size;
79}
80
81unsigned WebGLUnsignedShortArray::byteLength() const {
82    return m_size * sizeof(unsigned short);
83}
84
85PassRefPtr<WebGLArray> WebGLUnsignedShortArray::slice(unsigned offset, unsigned length) {
86    // Check to make sure the specified region is within the bounds of
87    // the WebGLArrayBuffer.
88    unsigned startByte = m_byteOffset + offset * sizeof(unsigned short);
89    unsigned limitByte = startByte + length * sizeof(unsigned short);
90    unsigned bufferLength = buffer()->byteLength();
91    if (startByte >= bufferLength || limitByte > bufferLength)
92        return 0;
93    return create(buffer(), startByte, length);
94}
95
96void WebGLUnsignedShortArray::set(WebGLUnsignedShortArray* array, unsigned offset, ExceptionCode& ec) {
97    setImpl(array, offset * sizeof(unsigned short), ec);
98}
99
100}
101
102#endif // ENABLE(3D_CANVAS)
103