SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)


Set an additional alpha value multiplied into render copy operations.


int SDL_SetTextureAlphaMod(SDL_Texture * texture,
                           Uint8 alpha);

Function Parameters

texture the texture to update
alpha the source alpha value multiplied into copy operations

Return Value

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 / 255)

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 2.0.0.


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