###### (This is the documentation for SDL3, which is under heavy development and the API is changing! [SDL2](https://wiki.libsdl.org/SDL2/) is the current stable version!)
# SDL_SetTextureAlphaModFloat

Set an additional alpha value multiplied into render copy operations.

## Header File

Defined in [<SDL3/SDL_render.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_render.h)

## Syntax

```c
int SDL_SetTextureAlphaModFloat(SDL_Texture *texture, float 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](SDL_GetError)() for more information.

## 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`

Alpha modulation is not always supported by the renderer; it will return -1
if alpha modulation is not supported.

## Version

This function is available since SDL 3.0.0.

## See Also

- [SDL_GetTextureAlphaModFloat](SDL_GetTextureAlphaModFloat)
- [SDL_SetTextureAlphaMod](SDL_SetTextureAlphaMod)
- [SDL_SetTextureColorModFloat](SDL_SetTextureColorModFloat)

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryRender](CategoryRender)