typedef union {
    
    struct {
    
    SceUChar8 R;
    SceUChar8 G;
    SceUChar8 B;
    SceUChar8 A;
    }  components;
    
    SceUInt32 Value;
    } mgpColor8888;
    
    
typedef union {
    
    struct {
    
    SceUShort16 R: 5;
    SceUShort16 G: 5;
    SceUShort16 B: 5;
    SceUShort16 A: 1;
    }  components;
    
    SceUShort16 Value;
    } mgpColor5555;

the mgp5555 is obviously bugged as a i need the union to create a 16-bit type.

typedef union {

    struct {
    
    >>5 bits<< R: 5;
    >>5 bits<< G: 5;
    >>5 bits <<B: 5;
    >>1 bits << A: 1;
    }  components;
    
    SceUShort16 Value;
    } mgpColor5555; 

I’ve hit a brick wall and i know this code looks nasty but it does work. However i still hate the fact i can’t individually place these values

SceUShort16 gen5551( SceUChar8  R, SceUChar8  G, SceUChar8  B, SceUChar8  A) {
    
     mgpColor5555 val;
     R >>=3;
     G >>=3;
     B >>=3;
     A= (A >= 0x80) ? 0b01 : 0b00;
     SceUShort16 temp = ((A & 1) << 15) |((B & 0x1F) <<10 )  | ((G & 0x1F) << 5)| (R & 0x1F);
     val.Value = temp;
     return val.Value;
}