/**
Constructor based on existing host memory. Will keep any region of interest
valid, by determining 'intersection' of regions.
@param data existing device memroy
@param ofs offset to new region
@param _size size of new region
*/
inline HostMemoryReference( HostMemory<Type, Dim> &data, const Size<Dim> &ofs,
const Size<Dim> &_size):
Layout<Type, Dim>(data),
Pointer<Type, Dim>(data),
HostMemory<Type, Dim>(data)
{
this->buffer = data.getBuffer() + data.getOffset(ofs);
this->size = _size;
for(int i = Dim; i--;)
{
// Min and Max did not work here !!!
int new_ofs = (int)this->region_ofs[i]-(int)ofs[i];
if (new_ofs < 0)
new_ofs = 0;
if (new_ofs > (int)this->size[i])
new_ofs = (int)this->size[i];
this->region_ofs[i] = new_ofs;
int new_size = this->region_size[i];
if (this->region_size[i] > this->size[i] - this->region_ofs[i])
new_size = this->size[i] - this->region_ofs[i];
this->region_size[i] = new_size;
}
}
void
copy(Texture<Type, Dim> &dst, const HostMemory<Type, Dim> &src)
{
CUDA_CHECK_SIZE;
dst.glTexSubImage(src.getBuffer());
}