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      1 /*
      2  * Copyright (C) 2011 Google 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 #include "core/html/canvas/WebGLVertexArrayObjectOES.h"
     29 
     30 #include "core/html/canvas/WebGLRenderingContextBase.h"
     31 
     32 namespace blink {
     33 
     34 PassRefPtrWillBeRawPtr<WebGLVertexArrayObjectOES> WebGLVertexArrayObjectOES::create(WebGLRenderingContextBase* ctx, VaoType type)
     35 {
     36     return adoptRefWillBeNoop(new WebGLVertexArrayObjectOES(ctx, type));
     37 }
     38 
     39 WebGLVertexArrayObjectOES::WebGLVertexArrayObjectOES(WebGLRenderingContextBase* ctx, VaoType type)
     40     : WebGLContextObject(ctx)
     41     , m_type(type)
     42     , m_hasEverBeenBound(false)
     43 #if ENABLE(OILPAN)
     44     , m_destructionInProgress(false)
     45 #endif
     46     , m_boundElementArrayBuffer(nullptr)
     47 {
     48     m_vertexAttribState.resize(ctx->maxVertexAttribs());
     49 
     50     switch (m_type) {
     51     case VaoTypeDefault:
     52         break;
     53     default:
     54         setObject(context()->webContext()->createVertexArrayOES());
     55         break;
     56     }
     57 }
     58 
     59 WebGLVertexArrayObjectOES::~WebGLVertexArrayObjectOES()
     60 {
     61 #if ENABLE(OILPAN)
     62     m_destructionInProgress = true;
     63 #endif
     64 
     65     // Delete the platform framebuffer resource. Explicit detachment
     66     // is for the benefit of Oilpan, where this vertex array object
     67     // isn't detached when it and the WebGLRenderingContextBase object
     68     // it is registered with are both finalized. Without Oilpan, the
     69     // object will have been detached.
     70     //
     71     // To keep the code regular, the trivial detach()ment is always
     72     // performed.
     73     detachAndDeleteObject();
     74 }
     75 
     76 void WebGLVertexArrayObjectOES::dispatchDetached(blink::WebGraphicsContext3D* context3d)
     77 {
     78     if (m_boundElementArrayBuffer)
     79         m_boundElementArrayBuffer->onDetached(context3d);
     80 
     81     for (size_t i = 0; i < m_vertexAttribState.size(); ++i) {
     82         VertexAttribState& state = m_vertexAttribState[i];
     83         if (state.bufferBinding)
     84             state.bufferBinding->onDetached(context3d);
     85     }
     86 }
     87 
     88 void WebGLVertexArrayObjectOES::deleteObjectImpl(blink::WebGraphicsContext3D* context3d, Platform3DObject object)
     89 {
     90     switch (m_type) {
     91     case VaoTypeDefault:
     92         break;
     93     default:
     94         context3d->deleteVertexArrayOES(object);
     95         break;
     96     }
     97 
     98 #if ENABLE(OILPAN)
     99     // These m_boundElementArrayBuffer and m_vertexAttribState heap
    100     // objects must not be accessed during destruction in the oilpan
    101     // build. They could have been already finalized. The finalizers
    102     // of these objects (and their elements) will themselves handle
    103     // detachment.
    104     if (!m_destructionInProgress)
    105         dispatchDetached(context3d);
    106 #else
    107     dispatchDetached(context3d);
    108 #endif
    109 }
    110 
    111 void WebGLVertexArrayObjectOES::setElementArrayBuffer(PassRefPtrWillBeRawPtr<WebGLBuffer> buffer)
    112 {
    113     if (buffer)
    114         buffer->onAttached();
    115     if (m_boundElementArrayBuffer)
    116         m_boundElementArrayBuffer->onDetached(context()->webContext());
    117     m_boundElementArrayBuffer = buffer;
    118 }
    119 
    120 void WebGLVertexArrayObjectOES::setVertexAttribState(
    121     GLuint index, GLsizei bytesPerElement, GLint size, GLenum type, GLboolean normalized, GLsizei stride, GLintptr offset, PassRefPtrWillBeRawPtr<WebGLBuffer> buffer)
    122 {
    123     GLsizei validatedStride = stride ? stride : bytesPerElement;
    124 
    125     VertexAttribState& state = m_vertexAttribState[index];
    126 
    127     if (buffer)
    128         buffer->onAttached();
    129     if (state.bufferBinding)
    130         state.bufferBinding->onDetached(context()->webContext());
    131 
    132     state.bufferBinding = buffer;
    133     state.bytesPerElement = bytesPerElement;
    134     state.size = size;
    135     state.type = type;
    136     state.normalized = normalized;
    137     state.stride = validatedStride;
    138     state.originalStride = stride;
    139     state.offset = offset;
    140 }
    141 
    142 void WebGLVertexArrayObjectOES::unbindBuffer(PassRefPtrWillBeRawPtr<WebGLBuffer> buffer)
    143 {
    144     if (m_boundElementArrayBuffer == buffer) {
    145         m_boundElementArrayBuffer->onDetached(context()->webContext());
    146         m_boundElementArrayBuffer = nullptr;
    147     }
    148 
    149     for (size_t i = 0; i < m_vertexAttribState.size(); ++i) {
    150         VertexAttribState& state = m_vertexAttribState[i];
    151         if (state.bufferBinding == buffer) {
    152             buffer->onDetached(context()->webContext());
    153             state.bufferBinding = nullptr;
    154         }
    155     }
    156 }
    157 
    158 void WebGLVertexArrayObjectOES::setVertexAttribDivisor(GLuint index, GLuint divisor)
    159 {
    160     VertexAttribState& state = m_vertexAttribState[index];
    161     state.divisor = divisor;
    162 }
    163 
    164 void WebGLVertexArrayObjectOES::VertexAttribState::trace(Visitor* visitor)
    165 {
    166     visitor->trace(bufferBinding);
    167 }
    168 
    169 void WebGLVertexArrayObjectOES::trace(Visitor* visitor)
    170 {
    171     visitor->trace(m_boundElementArrayBuffer);
    172     visitor->trace(m_vertexAttribState);
    173     WebGLContextObject::trace(visitor);
    174 }
    175 
    176 }
    177