406cc7c0c7
Add S-expression based video effects pipeline with modular effect definitions, constructs, and recipe files. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
29 lines
1.0 KiB
Common Lisp
29 lines
1.0 KiB
Common Lisp
;; CRT effect - old monitor simulation
|
|
;; @param line_spacing int [1, 10] default 2
|
|
;; @param line_opacity float [0, 1] default 0.3
|
|
;; @param vignette float [0, 1] default 0.2
|
|
|
|
(define-effect crt
|
|
((line_spacing 2) (line_opacity 0.3) (vignette_amount 0.2))
|
|
(let* ((w (width frame))
|
|
(h (height frame))
|
|
(cx (/ w 2))
|
|
(cy (/ h 2))
|
|
(max-dist (sqrt (+ (* cx cx) (* cy cy)))))
|
|
(map-pixels frame
|
|
(lambda (x y c)
|
|
(let* (;; Scanline darkening
|
|
(scanline-factor (if (= 0 (mod y line_spacing))
|
|
(- 1 line_opacity)
|
|
1))
|
|
;; Vignette
|
|
(dx (- x cx))
|
|
(dy (- y cy))
|
|
(dist (sqrt (+ (* dx dx) (* dy dy))))
|
|
(vignette-factor (- 1 (* (/ dist max-dist) vignette_amount)))
|
|
;; Combined
|
|
(factor (* scanline-factor vignette-factor)))
|
|
(rgb (* (red c) factor)
|
|
(* (green c) factor)
|
|
(* (blue c) factor)))))))
|