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      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 
     38 PassRefPtr<WebGLBuffer> WebGLBuffer::create(WebGLRenderingContext* ctx)
     39 {
     40     return adoptRef(new WebGLBuffer(ctx));
     41 }
     42 
     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 
     53 void WebGLBuffer::deleteObjectImpl(Platform3DObject object)
     54 {
     55     context()->graphicsContext3D()->deleteBuffer(object);
     56 }
     57 
     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 
    100 bool WebGLBuffer::associateBufferData(GC3Dsizeiptr size)
    101 {
    102     if (size < 0)
    103         return false;
    104     return associateBufferDataImpl(0, 0, size);
    105 }
    106 
    107 bool WebGLBuffer::associateBufferData(ArrayBuffer* array)
    108 {
    109     if (!array)
    110         return false;
    111     return associateBufferDataImpl(array, 0, array->byteLength());
    112 }
    113 
    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 
    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 
    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 
    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 
    168 GC3Dsizeiptr WebGLBuffer::byteLength() const
    169 {
    170     return m_byteLength;
    171 }
    172 
    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 
    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 
    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 
    203 void WebGLBuffer::clearCachedMaxIndices()
    204 {
    205     memset(m_maxIndexCache, 0, sizeof(m_maxIndexCache));
    206 }
    207 
    208 }
    209 
    210 #endif // ENABLE(WEBGL)
    211