void PixelBufferObject::compileBuffer(State& state) const
{
unsigned int contextID = state.getContextID();
_compiledList[contextID] = 1;
osg::Image* image = _bufferEntryImagePair.second;
_bufferEntryImagePair.first.modifiedCount[contextID] = image->getModifiedCount();
if (!image->valid()) return;
Extensions* extensions = getExtensions(contextID,true);
GLuint& pbo = buffer(contextID);
if (pbo==0)
{
// building for the first time.
_totalSize = image->getTotalSizeInBytes();
// don't generate buffer if size is zero.
if (_totalSize==0) return;
extensions->glGenBuffers(1, &pbo);
extensions->glBindBuffer(_target, pbo);
extensions->glBufferData(_target, _totalSize, NULL, _usage);
}
else
{
extensions->glBindBuffer(_target, pbo);
if (_totalSize != image->getTotalSizeInBytes())
{
// resize PBO.
_totalSize = image->getTotalSizeInBytes();
extensions->glBufferData(_target, _totalSize, NULL, _usage);
}
}
// osg::Timer_t start_tick = osg::Timer::instance()->tick();
void* pboMemory = extensions->glMapBuffer(_target,
GL_WRITE_ONLY_ARB);
// copy data across
memcpy(pboMemory, image->data(), _totalSize);
// Unmap the texture image buffer
extensions->glUnmapBuffer(_target);
_bufferEntryImagePair.first.modifiedCount[contextID] = image->getModifiedCount();
// osg::notify(osg::NOTICE)<<"pbo _totalSize="<<_totalSize<<std::endl;
// osg::notify(osg::NOTICE)<<"pbo "<<osg::Timer::instance()->delta_m(start_tick,osg::Timer::instance()->tick())<<"ms"<<std::endl;
}
void ElementBufferObject::compileBuffer(State& state) const
{
unsigned int contextID = state.getContextID();
_compiledList[contextID] = 1;
// osg::notify(osg::NOTICE)<<"ElementBufferObject::compile"<<std::endl;
Extensions* extensions = getExtensions(contextID,true);
unsigned int totalSizeRequired = 0;
// unsigned int numModified = 0;
// unsigned int numNotModified = 0;
for(BufferEntryDrawElementsPairs::const_iterator itr = _bufferEntryDrawElementsPairs.begin();
itr != _bufferEntryDrawElementsPairs.end();
++itr)
{
const BufferEntryDrawElementsPair& bep = *itr;
if (bep.second)
{
totalSizeRequired += bep.second->getTotalDataSize();
}
}
bool copyAll = false;
GLuint& ebo = buffer(contextID);
if (ebo==0)
{
// building for the first time.
_totalSize = totalSizeRequired;
// don't generate buffer if size is zero.
if (_totalSize==0) return;
extensions->glGenBuffers(1, &ebo);
extensions->glBindBuffer(_target, ebo);
extensions->glBufferData(_target, _totalSize, NULL, _usage);
copyAll = true;
}
else
{
extensions->glBindBuffer(_target, ebo);
if (_totalSize != totalSizeRequired)
{
// resize EBO.
_totalSize = totalSizeRequired;
extensions->glBufferData(_target, _totalSize, NULL, _usage);
copyAll = true;
}
}
// osg::Timer_t start_tick = osg::Timer::instance()->tick();
void* eboMemory = 0;
#if 0
eboMemory = extensions->glMapBuffer(_target, GL_WRITE_ONLY_ARB);
#endif
size_t offset = 0;
for(BufferEntryDrawElementsPairs::const_iterator itr = _bufferEntryDrawElementsPairs.begin();
itr != _bufferEntryDrawElementsPairs.end();
++itr)
{
const BufferEntryDrawElementsPair& bep = *itr;
const DrawElements* de = bep.second;
if (de)
{
if (copyAll ||
bep.first.modifiedCount[contextID] != bep.second->getModifiedCount() ||
bep.first.dataSize != bep.second->getTotalDataSize())
{
// copy data across
bep.first.dataSize = bep.second->getTotalDataSize();
bep.first.modifiedCount[contextID] = de->getModifiedCount();
if (copyAll)
{
bep.first.offset = offset;
de->setElementBufferObjectOffset((GLvoid*)offset);
offset += bep.first.dataSize;
}
if (eboMemory)
memcpy((char*)eboMemory + bep.first.offset, de->getDataPointer(), bep.first.dataSize);
else
extensions->glBufferSubData(_target, bep.first.offset, bep.first.dataSize, de->getDataPointer());
}
}
}
// Unmap the texture image buffer
if (eboMemory) extensions->glUnmapBuffer(_target);
// osg::notify(osg::NOTICE)<<"pbo _totalSize="<<_totalSize<<std::endl;
// osg::notify(osg::NOTICE)<<"pbo "<<osg::Timer::instance()->delta_m(start_tick,osg::Timer::instance()->tick())<<"ms"<<std::endl;
}