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(WEBGL)
29
30 #include "WebGLBuffer.h"
31
32 #include "ArrayBufferView.h"
33 #include "CheckedInt.h"
34 #include "WebGLRenderingContext.h"
35
36 namespace WebCore {
37
create(WebGLRenderingContext * ctx)38 PassRefPtr<WebGLBuffer> WebGLBuffer::create(WebGLRenderingContext* ctx)
39 {
40 return adoptRef(new WebGLBuffer(ctx));
41 }
42
WebGLBuffer(WebGLRenderingContext * ctx)43 WebGLBuffer::WebGLBuffer(WebGLRenderingContext* ctx)
44 : WebGLObject(ctx)
45 , m_target(0)
46 , m_byteLength(0)
47 , m_nextAvailableCacheEntry(0)
48 {
49 setObject(context()->graphicsContext3D()->createBuffer());
50 clearCachedMaxIndices();
51 }
52
deleteObjectImpl(Platform3DObject object)53 void WebGLBuffer::deleteObjectImpl(Platform3DObject object)
54 {
55 context()->graphicsContext3D()->deleteBuffer(object);
56 }
57
associateBufferDataImpl(ArrayBuffer * array,GC3Dintptr byteOffset,GC3Dsizeiptr byteLength)58 bool WebGLBuffer::associateBufferDataImpl(ArrayBuffer* array, GC3Dintptr byteOffset, GC3Dsizeiptr byteLength)
59 {
60 if (byteLength < 0 || byteOffset < 0)
61 return false;
62
63 if (array && byteLength) {
64 CheckedInt<GC3Dintptr> checkedOffset(byteOffset);
65 CheckedInt<GC3Dsizeiptr> checkedLength(byteLength);
66 CheckedInt<GC3Dintptr> checkedMax = checkedOffset + checkedLength;
67 if (!checkedMax.valid() || checkedMax.value() > static_cast<int32_t>(array->byteLength()))
68 return false;
69 }
70
71 switch (m_target) {
72 case GraphicsContext3D::ELEMENT_ARRAY_BUFFER:
73 m_byteLength = byteLength;
74 clearCachedMaxIndices();
75 if (byteLength) {
76 m_elementArrayBuffer = ArrayBuffer::create(byteLength, 1);
77 if (!m_elementArrayBuffer) {
78 m_byteLength = 0;
79 return false;
80 }
81 if (array) {
82 // We must always clone the incoming data because client-side
83 // modifications without calling bufferData or bufferSubData
84 // must never be able to change the validation results.
85 memcpy(static_cast<unsigned char*>(m_elementArrayBuffer->data()),
86 static_cast<unsigned char*>(array->data()) + byteOffset,
87 byteLength);
88 }
89 } else
90 m_elementArrayBuffer = 0;
91 return true;
92 case GraphicsContext3D::ARRAY_BUFFER:
93 m_byteLength = byteLength;
94 return true;
95 default:
96 return false;
97 }
98 }
99
associateBufferData(GC3Dsizeiptr size)100 bool WebGLBuffer::associateBufferData(GC3Dsizeiptr size)
101 {
102 if (size < 0)
103 return false;
104 return associateBufferDataImpl(0, 0, size);
105 }
106
associateBufferData(ArrayBuffer * array)107 bool WebGLBuffer::associateBufferData(ArrayBuffer* array)
108 {
109 if (!array)
110 return false;
111 return associateBufferDataImpl(array, 0, array->byteLength());
112 }
113
associateBufferData(ArrayBufferView * array)114 bool WebGLBuffer::associateBufferData(ArrayBufferView* array)
115 {
116 if (!array)
117 return false;
118 return associateBufferDataImpl(array->buffer().get(), array->byteOffset(), array->byteLength());
119 }
120
associateBufferSubDataImpl(GC3Dintptr offset,ArrayBuffer * array,GC3Dintptr arrayByteOffset,GC3Dsizeiptr byteLength)121 bool WebGLBuffer::associateBufferSubDataImpl(GC3Dintptr offset, ArrayBuffer* array, GC3Dintptr arrayByteOffset, GC3Dsizeiptr byteLength)
122 {
123 if (!array || offset < 0 || arrayByteOffset < 0 || byteLength < 0)
124 return false;
125
126 if (byteLength) {
127 CheckedInt<GC3Dintptr> checkedBufferOffset(offset);
128 CheckedInt<GC3Dintptr> checkedArrayOffset(arrayByteOffset);
129 CheckedInt<GC3Dsizeiptr> checkedLength(byteLength);
130 CheckedInt<GC3Dintptr> checkedArrayMax = checkedArrayOffset + checkedLength;
131 CheckedInt<GC3Dintptr> checkedBufferMax = checkedBufferOffset + checkedLength;
132 if (!checkedArrayMax.valid() || checkedArrayMax.value() > static_cast<int32_t>(array->byteLength()) || !checkedBufferMax.valid() || checkedBufferMax.value() > m_byteLength)
133 return false;
134 }
135
136 switch (m_target) {
137 case GraphicsContext3D::ELEMENT_ARRAY_BUFFER:
138 clearCachedMaxIndices();
139 if (byteLength) {
140 if (!m_elementArrayBuffer)
141 return false;
142 memcpy(static_cast<unsigned char*>(m_elementArrayBuffer->data()) + offset,
143 static_cast<unsigned char*>(array->data()) + arrayByteOffset,
144 byteLength);
145 }
146 return true;
147 case GraphicsContext3D::ARRAY_BUFFER:
148 return true;
149 default:
150 return false;
151 }
152 }
153
associateBufferSubData(GC3Dintptr offset,ArrayBuffer * array)154 bool WebGLBuffer::associateBufferSubData(GC3Dintptr offset, ArrayBuffer* array)
155 {
156 if (!array)
157 return false;
158 return associateBufferSubDataImpl(offset, array, 0, array->byteLength());
159 }
160
associateBufferSubData(GC3Dintptr offset,ArrayBufferView * array)161 bool WebGLBuffer::associateBufferSubData(GC3Dintptr offset, ArrayBufferView* array)
162 {
163 if (!array)
164 return false;
165 return associateBufferSubDataImpl(offset, array->buffer().get(), array->byteOffset(), array->byteLength());
166 }
167
byteLength() const168 GC3Dsizeiptr WebGLBuffer::byteLength() const
169 {
170 return m_byteLength;
171 }
172
getCachedMaxIndex(GC3Denum type)173 int WebGLBuffer::getCachedMaxIndex(GC3Denum type)
174 {
175 for (size_t i = 0; i < WTF_ARRAY_LENGTH(m_maxIndexCache); ++i)
176 if (m_maxIndexCache[i].type == type)
177 return m_maxIndexCache[i].maxIndex;
178 return -1;
179 }
180
setCachedMaxIndex(GC3Denum type,int value)181 void WebGLBuffer::setCachedMaxIndex(GC3Denum type, int value)
182 {
183 size_t numEntries = WTF_ARRAY_LENGTH(m_maxIndexCache);
184 for (size_t i = 0; i < numEntries; ++i)
185 if (m_maxIndexCache[i].type == type) {
186 m_maxIndexCache[i].maxIndex = value;
187 return;
188 }
189 m_maxIndexCache[m_nextAvailableCacheEntry].type = type;
190 m_maxIndexCache[m_nextAvailableCacheEntry].maxIndex = value;
191 m_nextAvailableCacheEntry = (m_nextAvailableCacheEntry + 1) % numEntries;
192 }
193
setTarget(GC3Denum target)194 void WebGLBuffer::setTarget(GC3Denum target)
195 {
196 // In WebGL, a buffer is bound to one target in its lifetime
197 if (m_target)
198 return;
199 if (target == GraphicsContext3D::ARRAY_BUFFER || target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER)
200 m_target = target;
201 }
202
clearCachedMaxIndices()203 void WebGLBuffer::clearCachedMaxIndices()
204 {
205 memset(m_maxIndexCache, 0, sizeof(m_maxIndexCache));
206 }
207
208 }
209
210 #endif // ENABLE(WEBGL)
211