ref: 79050578c7fb0a2efc4c4d9c04ba63738fb5f660
dir: /r_surf_light.h/
static inline pixel_t addlight(pixel_t x, int lr, int lg, int lb) { int r, g, b; if(fullbright && (x & 0xff000000U) == 0) return x; if(additive) return x; r = (x>>16) & 0xff; g = (x>>8) & 0xff; b = (x>>0) & 0xff; r = (r * ((64<<8)-(lr & 0xffff))) >> (8+VID_CBITS); g = (g * ((64<<8)-(lg & 0xffff))) >> (8+VID_CBITS); b = (b * ((64<<8)-(lb & 0xffff))) >> (8+VID_CBITS); x = (x & 0xff000000) | r<<16 | g<<8 | b<<0; return x; }