def __init__(self, size, chunk_size, ctype='float'):
"""Create a new buffer of n chunks.
Parameters:
size: number of chunks
chunk_size: size of each chunk
ctype: string of the C type to use (defaults to float)
"""
self.count = 0 # current number of chunks
self.size = size # max number of chunks
self.chunk_size = chunk_size # size of chunks
self.ctype = ctype
self.data = self._allocate(size)
self.ctype_size = sizeof(self.data[0:1])
def load(self, data, size=None):
"""Data is cffi array"""
self.bind()
if size is None:
# ffi's sizeof understands arrays
size = sizeof(data)
if size == self.buffer_size:
# same size - no need to allocate new buffer, just copy
glBufferSubData(self.array_type, 0, size, to_raw_pointer(data))
else:
# buffer size has changed - need to allocate new buffer in the GPU
glBufferData(self.array_type, size, to_raw_pointer(data),
self.draw_type)
self.buffer_size = size
self.unbind()
def load(self, data, size=None):
"""Data is cffi array"""
self.bind()
if size is None:
# ffi's sizeof understands arrays
size = sizeof(data)
if size == self.buffer_size:
# same size - no need to allocate new buffer, just copy
glBufferSubData(
self.array_type,
0,
size,
to_raw_pointer(data)
)
else:
# buffer size has changed - need to allocate new buffer in the GPU
glBufferData(
self.array_type,
size,
to_raw_pointer(data),
self.draw_type
)
self.buffer_size = size
self.unbind()