### Function

# Cogl xlib_renderer_request_reset_on_video_memory_purge

#### Declaration [src]

    void
    cogl_xlib_renderer_request_reset_on_video_memory_purge (
      CoglRenderer* renderer,
      gboolean enable
    )

#### Description [src]

Sets whether Cogl should make use of the NV_robustness_video_memory_purge extension, if exposed by the driver, by initializing the GLX context appropriately.

The extension is only useful when running on certain versions of the NVIDIA driver. Quoting from the spec:

“The NVIDIA OpenGL driver architecture on Linux has a limitation: resources located in video memory are not persistent across certain events. VT switches, suspend/resume events, and mode switching events may erase the contents of video memory. Any resource that is located exclusively in video memory, such as framebuffer objects (FBOs), will be lost.”

“This extension provides a way for applications to discover when video memory content has been lost, so that the application can re-populate the video memory content as necessary.”

“Any driver that exposes this extension is a driver that considers video memory to be volatile. Once the driver stack has been improved, the extension will no longer be exposed.”

`cogl_get_graphics_reset_status()` needs to be called at least once every frame to find out if video memory was purged.

Note that this doesn’t cause Cogl to enable robust buffer access but other context reset errors may still happen and be reported via `cogl_get_graphics_reset_status()` if external factors cause the driver to trigger them.

This defaults to `FALSE` and is effective only if called before `cogl_display_setup()` .

This function is not directly available to language bindings.

#### Parameters

`renderer`

  Type: `CoglRenderer*`

  A `CoglRenderer`.

  The data is owned by the caller of the function.

`enable`

  Type: `gboolean`

  The new value.