The bits of this structure can be directly reinterpreted as a float-packed color which uses the SDL_PIXELFORMAT_RGBA128_FLOAT format
Defined in <SDL3/SDL_pixels.h>
typedef struct SDL_FColor { float r; float g; float b; float a; } SDL_FColor;
This struct is available since SDL 3.0.0.
CategoryAPI, CategoryAPIStruct, CategoryPixels