Sega Saturn Development > Jo Engine Wish List

Reading binary files with pointers instead of returned char stream?

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XL2:
I managed to build my custom binary file format and read it on the Saturn, so I can display a mesh loaded from a binary file on the CD.

My concern now is that I'm using the jo_fs_read_file, which returns a char stream, which takes memory while I'm loading everything to the right place.
It's not a huge problem while loading small images and sound files, but for a map taking 1 MB, it just won't be doable (unless I'm mistaken and got it all wrong).

Is there a way, in Jo Engine, to just use a pointer to read the file and return each time only what you need (like 8, 16, 24 or 32 bits from a start pointer)?
If not, can it be added in the next version?
Thanks!

mindslight:
Sure :)

XL2:
Great! Thanks!

I know the topic is now in "Wish list", but I could need some help.
Bad news ; while the binary mesh loading works in Yabause, in SSF it's a real mess (but works with lower compatibility) while on real hardware it doesn't work at all (it crashes before even loading anything).
It's probably a mistake related to memory allocation or initalization, but I have no idea what's wrong at the moment.
I've attached the files, if anyone with better knowledge of memory allocation could look it up, I would really appreciate!
Thanks!


--- Code: ---
//Start address is 0x00200000

void * LoadBinaryMAP(void * startAddress)
{

 char * stream;
 void * currentAddress;
 int length;
 mesh_tot = 0;
 stream = jo_fs_read_file("MAPT.ZTM", &length);

register unsigned int idx = 0;
register unsigned short i=0;
register unsigned int ii=0;
register unsigned int iii=0;
register unsigned int nbpoint=0;
register unsigned int nbpolygon=0;

currentAddress = startAddress;

mesh_tot = jo_swap_endian_ushort(*((unsigned short *)(stream)));
idx+=2;

for (i=0; i<mesh_tot; i++)
{
    jo3dMesh[i] = currentAddress;
    nbpoint = jo_swap_endian_uint(*((unsigned int *)(stream+idx)));
    idx+=4;
    nbpolygon = jo_swap_endian_uint(*((unsigned int *)(stream + idx)));
    idx+=4;

    jo3dMesh[i]->data.pntbl = (POINT*)(jo3dMesh[i] + sizeof(unsigned int));
    for (JO_ZERO(ii); ii<nbpoint; ii++)
    {
        for (JO_ZERO(iii); iii<3; iii++)
        {
            jo3dMesh[i]->data.pntbl[ii][iii] =  jo_swap_endian_int(*((int *)(stream + idx)));
            idx+=4;
        }
    }
    jo3dMesh[i]->data.pltbl = (POLYGON*) (jo3dMesh[i]->data.pntbl + sizeof(POINT)*nbpoint);
    for (JO_ZERO(ii); ii<nbpolygon; ii++)
    {
        for (JO_ZERO(iii); iii<3; iii++)
        {
            jo3dMesh[i]->data.pltbl[ii].norm[iii] = jo_swap_endian_int(*((int *)(stream + idx)));
            idx+=4;
        }
        for (JO_ZERO(iii); iii<4; iii++)
        {
            jo3dMesh[i]->data.pltbl[ii].Vertices[iii]=jo_swap_endian_ushort(*((unsigned short*)(stream + idx)));
            idx+=2;
        }
    }
    jo3dMesh[i]->data.attbl = (ATTR*) (jo3dMesh[i]->data.pltbl + sizeof(POLYGON)*nbpolygon);

    for (JO_ZERO(ii); ii<nbpolygon; ii++)
    {
        jo3dMesh[i]->data.attbl[ii].texno = jo_swap_endian_ushort(*((unsigned short*)(stream + idx)));
        idx+=2;
        jo3dMesh[i]->data.attbl[ii].sort = SORT_MAX;
        jo3dMesh[i]->data.attbl[ii].flag = Dual_Plane;
        jo3dMesh[i]->data.attbl[ii].colno = No_Palet;
        jo3dMesh[i]->data.attbl[ii].gstb = No_Gouraud;
        jo3dMesh[i]->data.attbl[ii].dir = MESHoff, sprNoflip, UseLight;
    }

    jo3dMesh[i]->data.nbPoint = nbpoint;
    jo3dMesh[i]->data.nbPolygon = nbpolygon;

    currentAddress = (void*) (jo3dMesh[i] + sizeof(jo3dMesh[i]));
}
jo_free(stream);
jo_printf(0, 6, "current adress :            %d     ", currentAddress);
return currentAddress;
}

--- End code ---

XL2:
The good folks at SegaXtreme helped with it, and it was an issue with data alignment.
Seems to be fixed for now!
I will update the tool and FPS demo in the next few days to show map loading from the disc.

mindslight:
Great !

BTW, I'll add more filesystem feature in the next release

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