José Fonseca wrote on 2010-01-20 14:32:
> 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)
> ...
>
>
That's perfect. Thanks, Jose.
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