Use this function to set an additional alpha value multiplied into render copy operations.
int SDL_SetTextureAlphaMod(SDL_Texture* texture, Uint8 alpha)
the texture to update
the source alpha value multiplied into copy operations
Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
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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.