On Wed, Jun 22, 2016 at 7:43 PM Vasco Alexandre da Silva Costa <
vasco.co...@gmail.com> wrote:
> On Wed, Jun 22, 2016 at 2:36 PM, Param Hanji <param.catchch...@gmail.com>
> wrote:
>
>> - in copy_to_cpu if gpu_seg->seg_sti is zero the cpu_seg->seg_stp->st_id
>>> will be uninitialized. worse. you are writing to an uninitialized pointer.
>>> what I think you want to do is lookup the seg_stp pointer based on the
>>> seg_sti id and use that to initialize the cpu->seg_stp pointer field.
>>>
>>
>> I can't find the relevant code that initializes the seg_stp. The rt_shot
>> methods in primitive files simply copy the passed soltab pointer. In
>> shootray(), this is obtained from a cutter, which is a union for space
>> partitioning.
>>
>> My understanding is that the structure soltab keeps track of all the
>> relevant information pertaining to a solid (primitive). On the GPU side,
>> only ID (seg_sti) is used. How do I initialize the cpu->seg_stp field?
>>
>
> One way to do it would be to store the soltab pointers in an array indexed
> by the integer solid 'id'. You should be able to do this in
> src/librt/primitives/primitive_util.c:clt_db_store. It's iterating through
> a cutter's solids and the current solid pointer is stored in the variable
> 'stp'.
>
> I realized I can loop through all the all the solids using the macros
defined in soltab.h like this
RT_VISIT_ALL_SOLTABS_START(stp, a->a_rt_i) {
if (stp->st_id == (int)gpu_seg->seg_sti)
cpu_seg->seg_stp = stp;
} RT_VISIT_ALL_SOLTABS_END
When I ran this I noticed that some of the GPU segments don't have seg_sti
initialized (value 0). How can I process these?
> --
> Vasco Alexandre da Silva Costa
> PhD in Computer Engineering (Computer Graphics)
> Instituto Superior Técnico/University of Lisbon, Portugal
>
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