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| When a 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` |
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)` |
SDL_SetTextureAlphaMod
Use this function to set an additional alpha value multiplied into render copy operations.
Contents
Syntax
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.
Code Examples
You can add your code example here
Remarks
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.
You can call SDL_GetRendererInfo() to fill in an SDL_RendererInfo structure with the information about the current renderer. This structure will have SDL_TEXTUREMODULATE_ALPHA set in the mod_modes mask if alpha modulation is supported.
