# tui/gl? True on a GL host, where pixel draw commands, textures, and embedded surface windows render at native resolution. Use it to gate pixel-only features such as 3D scenes and SDL surfaces. ## Syntax

[tui/gl?]

## Examples

if [tui/gl?] {
    [gl/present $canvas]   # 3D scene — GL only
}

## Returns bool — true on `retro` and `hydra`; false on the ANSI host `retra`. Compiled per host, so it needs no attached workspace. ## See Also `tui/backend`, `gl/reset`, `draw/image`