Re: [sdljava-users] Problem with sdl_gfx -> aaPolygonRGBA

[Robert S. <the...@gm...>]

Hi.
I have not seen how you create and fill the ShortBuffer but it could be 
a problem with endianness/byte-order (or byte sex :) ).

ByteBuffer.allocateDirect(2*NUM_OF_SHORTS).byteOrder(ByteOrder.nativeOrder()).asShortBuffer() 
should do the trick

cu
Robert

Ivan Z. Ganza wrote:

> I've checked in code which effectively changes all short[] arguments 
> to ShortBuffers(s) instead.
>
> There is a problem however and I'm not sure what it is.  Running 
> test-aaploygonRGBA.bsh results in the following out -- although I am 
> passing sane values when the ShortBuffer is read on the C side the 
> values are all messed up.  This is strange because I'm using the same 
> idea with the OpenGL layer and all seems to work fine.  I'm not access 
> the buffers myself on the OpenGL though, OpenGL is, yet it works fine 
> in that case.  If any has a clue please let me know....The code looks 
> like this:  void* vx and void* vy are pointers obtained via 
> getDirectByteBufferAddress()...
>
> int SWIG_aapolygonRGBA(SDL_Surface *dst, void* vx, void* vy, int n, 
> Uint8 r, Uint8 g, Uint8 b, Uint8 a) {
>
>    int i;
>
>    for (i = 0; i < n; i++) {
>      Sint16* svx = (Sint16*)vx;
>      Sint16* svy = (Sint16*)vy;
>      printf("n=%i, vx=%i, vy=%i\n", i, svx[i], svy[i]);
>    }
>    return aapolygonRGBA(dst, (Sint16*)vx, (Sint16*)vy, n, r, g, b, a);
>  }
>
>
> n=0, vx=28928, vy=29288
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=28928
> n=0, vx=31440, vy=31800
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=31440
> n=0, vx=-31552, vy=-31192
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=-31552
> n=0, vx=-29040, vy=-28680
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=-29040
> n=0, vx=-26528, vy=-26168
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=-26528
> n=0, vx=-24000, vy=-23640
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=-24000
> n=0, vx=-21488, vy=-21128
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=-21488
> n=0, vx=-18976, vy=-18616
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=-18976
> n=0, vx=-16464, vy=-16104
> n=1, vx=17819, vy=17819
> n=2, vx=-28704, vy=-16464
>
>
> gol...@un... wrote:
>
>> Thanks for responding so quick :)
>>
>> If i find some free time today i'll try to compile from cvs (which i 
>> tried before but never succeded)
>>
>> Goliat
>>
>> PS: if this is a html mail ... sry ;) (trying to get kmail working)
>>
>>
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>
>
>
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