1 /*
2 * Copyright (C) 2009 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27
28 #if ENABLE(3D_CANVAS)
29
30 #include "WebGLArrayBuffer.h"
31 #include "WebGLShortArray.h"
32
33 namespace WebCore {
34
create(unsigned length)35 PassRefPtr<WebGLShortArray> WebGLShortArray::create(unsigned length)
36 {
37 RefPtr<WebGLArrayBuffer> buffer = WebGLArrayBuffer::create(length * sizeof(short));
38 return create(buffer, 0, length);
39 }
40
create(short * array,unsigned length)41 PassRefPtr<WebGLShortArray> WebGLShortArray::create(short* array, unsigned length)
42 {
43 RefPtr<WebGLShortArray> a = WebGLShortArray::create(length);
44 for (unsigned i = 0; i < length; ++i)
45 a->set(i, array[i]);
46 return a;
47 }
48
create(PassRefPtr<WebGLArrayBuffer> buffer,int byteOffset,unsigned length)49 PassRefPtr<WebGLShortArray> WebGLShortArray::create(PassRefPtr<WebGLArrayBuffer> buffer,
50 int byteOffset,
51 unsigned length)
52 {
53 // Make sure the offset results in valid alignment.
54 if ((byteOffset % sizeof(short)) != 0)
55 return NULL;
56
57 if (buffer) {
58 // Check to make sure we are talking about a valid region of
59 // the given WebGLArrayBuffer's storage.
60 if ((byteOffset + (length * sizeof(short))) > buffer->byteLength())
61 return NULL;
62 }
63
64 return adoptRef(new WebGLShortArray(buffer, byteOffset, length));
65 }
66
WebGLShortArray(PassRefPtr<WebGLArrayBuffer> buffer,int byteOffset,unsigned length)67 WebGLShortArray::WebGLShortArray(PassRefPtr<WebGLArrayBuffer> buffer, int byteOffset, unsigned length)
68 : WebGLArray(buffer, byteOffset)
69 , m_size(length)
70 {
71 }
72
length() const73 unsigned WebGLShortArray::length() const {
74 return m_size;
75 }
76
byteLength() const77 unsigned WebGLShortArray::byteLength() const {
78 return m_size * sizeof(short);
79 }
80
slice(unsigned offset,unsigned length)81 PassRefPtr<WebGLArray> WebGLShortArray::slice(unsigned offset, unsigned length) {
82 // Check to make sure the specified region is within the bounds of
83 // the WebGLArrayBuffer.
84 unsigned startByte = m_byteOffset + offset * sizeof(short);
85 unsigned limitByte = startByte + length * sizeof(short);
86 unsigned bufferLength = buffer()->byteLength();
87 if (startByte >= bufferLength || limitByte > bufferLength)
88 return 0;
89 return create(buffer(), startByte, length);
90 }
91
set(WebGLShortArray * array,unsigned offset,ExceptionCode & ec)92 void WebGLShortArray::set(WebGLShortArray* array, unsigned offset, ExceptionCode& ec) {
93 setImpl(array, offset * sizeof(short), ec);
94 }
95
96 }
97
98 #endif // ENABLE(3D_CANVAS)
99