Man page - sdl_alpha_transparent_float(3)

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Manual

SDL_ALPHA_TRANSPARENT_FLOAT(3) SDL3 FUNCTIONS SDL_ALPHA_TRANSPARENT_FLOAT(3)

SDL_ALPHA_TRANSPARENT_FLOAT - A fully transparent floating point alpha value.

Defined in SDL3/SDL_pixels.h

#include "SDL3/SDL.h"
#define SDL_ALPHA_TRANSPARENT_FLOAT 0.0f

This macro is available since SDL 3.2.0.

(3), SDL_ALPHA_OPAQUE_FLOAT(3)

SDL 3.2.10 Simple Directmedia Layer