sdlSetTextureAlphaMod function

int sdlSetTextureAlphaMod(
  1. Pointer<SdlTexture> texture,
  2. int alpha
)

Set an additional alpha value multiplied into render copy operations.

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.

\param texture the texture to update \param alpha 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.

\since This function is available since SDL 2.0.0.

\sa SDL_GetTextureAlphaMod \sa SDL_SetTextureColorMod

extern DECLSPEC int SDLCALL SDL_SetTextureAlphaMod(SDL_Texture * texture, Uint8 alpha)

Implementation

int sdlSetTextureAlphaMod(Pointer<SdlTexture> texture, int alpha) {
  final sdlSetTextureAlphaModLookupFunction = libSdl2.lookupFunction<
      Int32 Function(Pointer<SdlTexture> texture, Uint8 alpha),
      int Function(
          Pointer<SdlTexture> texture, int alpha)>('SDL_SetTextureAlphaMod');
  return sdlSetTextureAlphaModLookupFunction(texture, alpha);
}