Set an additional alpha value multiplied into render copy operations.
Defined in <SDL3/SDL_render.h>
int SDL_SetTextureAlphaModFloat(SDL_Texture *texture, float alpha);
SDL_Texture * | texture | the texture to update. |
float | alpha | the source alpha value multiplied into copy operations. |
(int) Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
When this texture is rendered, during the copy operation the source alpha value is modulated by this alpha value according to the following formula:
srcA = srcA * alpha
Alpha modulation is not always supported by the renderer; it will return -1 if alpha modulation is not supported.
This function is available since SDL 3.0.0.