On Wed, 2010-01-20 at 03:55 -0800, michal wrote:
> Jose,
>
> How one can upload data to buffers in python state tracker?
>
> I am trying to do the following:
>
> + cb0_data = [
> + 0.0, 0.0, 0.0, 0.0,
> + 0.0, 0.0, 0.0, 1.0,
> + 1.0, 1.0, 1.0, 1.0,
> + 2.0, 4.0, 8.0, 1.0,
> + ]
> +
> + constbuf0 = dev.buffer_create(
> + 16,
> + PIPE_BUFFER_USAGE_CONSTANT |
> + PIPE_BUFFER_USAGE_GPU_READ |
> + PIPE_BUFFER_USAGE_GPU_WRITE |
> + PIPE_BUFFER_USAGE_CPU_READ |
> + PIPE_BUFFER_USAGE_CPU_WRITE,
> + 4 * 4 * 4)
> +
> + constbuf0.write_(cb0_data, 4 * 4 * 4)
>
> But I can't find a way to convert a list of floats to (char *). Do have
> an idea how to do it?
Hi Michal,
The Gallium -> Python bindings are autogenerated by SWIG and there are
several things which are not very "pythonic". Writing data into/out of
the buffers is one of them.
ATM the only way to do this is using the python struct module, and pack
the floats into a string... That is:
import struct
data = ''
data += struct.pack('4f', 1.0, 2.0, 3.0, 4.0)
...
Jose
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