def _get_gl_tex_format(self, texture_format, num_channels):
if texture_format and not isinstance(texture_format, str):
texture_format = np.dtype(texture_format).type
if texture_format not in self._texture_dtype_format:
raise ValueError("Can't determine internal texture format for '{}'".format(texture_format))
should_cast_to_f32(texture_format)
texture_format = self._texture_dtype_format[texture_format]
# adjust internalformat for format of data (RGBA vs L)
texture_format = texture_format.replace('r', 'rgba'[:num_channels])
return texture_format
def _scale_data_on_cpu(data, clim, copy=True):
if copy:
should_cast_to_f32(data.dtype)
data = np.array(data, dtype=np.float32, copy=copy)
elif not copy and not np.issubdtype(data.dtype, np.floating):
raise ValueError("Data must be of floating type for no copying to occur.")
if clim[0] != clim[1]:
data -= clim[0]
data *= 1.0 / (clim[1] - clim[0])
if should_cast_to_f32(data.dtype):
data = data.astype(np.float32)
return data
def _cast_arrays_if_needed(data_arrays):
for data in data_arrays:
if data is not None and should_cast_to_f32(data.dtype):
data = data.astype(np.float32)
yield data