21.1 Display Enumeration🔗ℹ

(for ([id (get-displays)])

(printf "Display ~a: ~a~n" id (display-name id)))

21.2 Display Bounds🔗ℹ

Returns (values x y width height) in screen coordinates.

(define-values (x y w h) (display-bounds (primary-display)))

(printf "Primary display: ~ax~a at (~a, ~a)~n" w h x y)

Returns (values x y width height).

21.3 Display Modes🔗ℹ

Display modes describe the resolution and refresh rate of a display.

The returned pointer is owned by SDL and should not be freed.

The returned pointer is owned by SDL and should not be freed.

(define mode (current-display-mode (primary-display)))

(define-values (w h) (display-mode-resolution mode))

(printf "Current resolution: ~ax~a~n" w h)

21.4 Window-Display Relationship🔗ℹ

This is 1.0 for standard displays, 2.0 for Retina/HiDPI displays.

(define scale (display-content-scale (primary-display)))

(when (> scale 1.0)

(printf "HiDPI display detected (scale: ~a)~n" scale))

21.5 Display Mode Struct Accessors🔗ℹ

These functions access fields of the SDL_DisplayMode struct: