// 0x20
typedef union
{
    struct
    {
        unsigned    rid : 8;
        unsigned    sux : 12;
        unsigned    suy : 12;
    };
    u32     scis0;
} SU_SCIS0;

// 0x21
typedef union
{
    struct
    {
        unsigned    rid : 8;
        unsigned    suw : 12;
        unsigned    suh : 12;
    };
    u32     scis1;
} SU_SCIS1;

void GXGetScissor(
    u32* xOrig, 
    u32* yOrig, 
    u32* wd, 
    u32* ht )
{
    SU_SCIS0 s0 = gx.suScis0;
    SU_SCIS1 s1 = gx.suScis1;
    
    *xOrig = s0.sux - 342;
    *yOrig = s0.suy - 342;
    *wd = s1.suw - s0.sux + 1;
    *ht = s1.suh - s0.suy + 1;
}