pmd-red/include/structs/rgb.h

#ifndef GUARD_RGB_H
#define GUARD_RGB_H

// Size: 0x4
typedef struct RGB_Struct
{
    u8 r;
    u8 g;
    u8 b;
    u8 unk4; // Never read, always 0x80. Unused transparency/alpha flag?
} RGB_Struct;

// Size: R=0x8 | B=0x6
typedef struct RGB_Struct16
{
    s16 r;
    s16 g;
    s16 b;
} RGB_Struct16;

#define RGB_R 0
#define RGB_G 1
#define RGB_B 2
#define RGB_UNK 3
#define RGB_FIELDS_COUNT 4

// Size: 0x4
typedef struct RGB_Array
{
    u8 c[RGB_FIELDS_COUNT];
} RGB_Array;

// Size: 0x4
typedef union RGB_Union
{
    RGB_Array asArr;
    RGB_Struct separate;
} RGB_Union;

// Size: 0x40
typedef struct RGB_Palette
{
    /* 0x0 */ RGB_Struct colors[16];
} RGB_Palette;

#define RGB_TO_GBA(r, g, b) RGB2(((u32)(r) & 0xF8) >> 3, ((g) & 0xF8) >> 3, ((b) & 0xF8) >> 3)
// Needed to match, functionally equivalent to the above.
#define RGB_TO_GBA2(r, g, b)(((u32)((b) & 0xF8) >> 2 << 9) | (((u32)(g) & 0xF8) >> 3 << 5) | (((u32)(r) & 0xF8) >> 3))

#endif // GUARD_RGB_H