###### (This is the legacy documentation for stable SDL2, the current stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current development version.)
# SDL_GL_SetAttribute

Set an OpenGL window attribute before window creation.

## Header File

Defined in [SDL_video.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_video.h), but apps should _only_ `#include "SDL.h"`!

## Syntax

```c
int SDL_GL_SetAttribute(SDL_GLattr attr, int value);

```

## Function Parameters

|               |                                                                               |
| ------------- | ----------------------------------------------------------------------------- |
| **attr**      | an [SDL_GLattr](SDL_GLattr) enum value specifying the OpenGL attribute to set |
| **value**     | the desired value for the attribute                                           |

## Return Value

Returns 0 on success or a negative error code on failure; call
[SDL_GetError](SDL_GetError)() for more information.

## Remarks

This function sets the OpenGL attribute `attr` to `value`. The requested
attributes should be set before creating an OpenGL window. You should use
[SDL_GL_GetAttribute](SDL_GL_GetAttribute)() to check the values after
creating the OpenGL context, since the values obtained can differ from the
requested ones.

## Version

This function is available since SDL 2.0.0.

## See Also

* [SDL_GL_GetAttribute](SDL_GL_GetAttribute)
* [SDL_GL_ResetAttributes](SDL_GL_ResetAttributes)

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[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction)