giles
1a74d811f7
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Merges full history from art-dag/mono.git into the monorepo under the artdag/ directory. Contains: core (DAG engine), l1 (Celery rendering server), l2 (ActivityPub registry), common (shared templates/middleware), client (CLI), test (e2e). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> git-subtree-dir: artdag git-subtree-mainline:1a179de547git-subtree-split:4c2e716558
31 lines
1.1 KiB
Common Lisp
31 lines
1.1 KiB
Common Lisp
;; CRT effect - old monitor simulation
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(require-primitives "image")
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(define-effect crt
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:params (
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(line_spacing :type int :default 2 :range [1 10])
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(line_opacity :type float :default 0.3 :range [0 1])
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(vignette_amount :type float :default 0.2)
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)
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(let* ((w (image:width frame))
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(h (image:height frame))
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(cx (/ w 2))
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(cy (/ h 2))
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(max-dist (sqrt (+ (* cx cx) (* cy cy)))))
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(map-pixels frame
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(lambda (x y c)
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(let* (;; Scanline darkening
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(scanline-factor (if (= 0 (mod y line_spacing))
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(- 1 line_opacity)
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1))
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;; Vignette
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(dx (- x cx))
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(dy (- y cy))
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(dist (sqrt (+ (* dx dx) (* dy dy))))
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(vignette-factor (- 1 (* (/ dist max-dist) vignette_amount)))
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;; Combined
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(factor (* scanline-factor vignette-factor)))
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(rgb (* (red c) factor)
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(* (green c) factor)
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(* (blue c) factor)))))))
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