gl::Error Buffer11::setSubData(const void *data, size_t size, size_t offset)
{
size_t requiredSize = size + offset;
if (data && size > 0)
{
// Use system memory storage for dynamic buffers.
BufferStorage *writeBuffer = nullptr;
if (supportsDirectBinding())
{
writeBuffer = getStagingStorage();
if (!writeBuffer)
{
return gl::Error(GL_OUT_OF_MEMORY, "Failed to allocate internal buffer.");
}
}
else
{
SystemMemoryStorage *systemMemoryStorage = nullptr;
gl::Error error = getSystemMemoryStorage(&systemMemoryStorage);
if (error.isError())
{
return error;
}
writeBuffer = systemMemoryStorage;
}
ASSERT(writeBuffer);
// Explicitly resize the staging buffer, preserving data if the new data will not
// completely fill the buffer
if (writeBuffer->getSize() < requiredSize)
{
bool preserveData = (offset > 0);
gl::Error error = writeBuffer->resize(requiredSize, preserveData);
if (error.isError())
{
return error;
}
}
writeBuffer->setData(static_cast<const uint8_t *>(data), offset, size);
writeBuffer->setDataRevision(writeBuffer->getDataRevision() + 1);
}
mSize = std::max(mSize, requiredSize);
invalidateStaticData();
return gl::Error(GL_NO_ERROR);
}
