Get the additional alpha value multiplied into render copy operations.
Defined in <SDL3/SDL_render.h>
bool SDL_GetTextureAlphaModFloat(SDL_Texture *texture, float *alpha);| SDL_Texture * | texture | the texture to query. | 
| float * | alpha | a pointer filled in with the current alpha value. | 
(bool) Returns true on success or false on failure; call SDL_GetError() for more information.
This function should only be called on the main thread.
This function is available since SDL 3.2.0.