From c12a1d6136021d685074ff8143309503bbd68164 Mon Sep 17 00:00:00 2001
From: azimut <azimut.github@protonmail.com>
Date: Sat, 2 Nov 2024 01:28:22 -0300
Subject: [PATCH] fxaa3: init wrapper over nineveh

---
 scenic.asd                 |  1 +
 src/postprocess/fxaa3.lisp | 66 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 src/postprocess/fxaa3.lisp

diff --git a/scenic.asd b/scenic.asd
index 748cf49..cf1f7ae 100644
--- a/scenic.asd
+++ b/scenic.asd
@@ -74,6 +74,7 @@
    (:file "postprocess/hdr")
    (:file "postprocess/hdr-acesfilm")
    (:file "postprocess/dither")
+   (:file "postprocess/fxaa3")
    (:file "postprocess/defer/defer")
    (:file "postprocess/defer/ibl")
    (:file "postprocess/defer/ssao")
diff --git a/src/postprocess/fxaa3.lisp b/src/postprocess/fxaa3.lisp
new file mode 100644
index 0000000..a23c327
--- /dev/null
+++ b/src/postprocess/fxaa3.lisp
@@ -0,0 +1,66 @@
+(in-package #:scenic)
+
+(defclass fxaa3 (postprocess)
+  ((aliasing-removal
+    :accessor fxaa3-aliasing-removal
+    :initarg :aliasing-removal
+    :documentation "Amount of sub pixel aliasing removal. Choose the amount of sub-pixel aliasing removal. This can effect sharpness.")
+   (min-contrast
+    :accessor fxaa3-min-contrast
+    :initarg :min-contrast
+    :documentation "Minimum local contrast required to apply. The minimum amount of local contrast required to apply algorithm.")
+   (min-threshold
+    :accessor fxaa3-min-threshold
+    :initarg :min-threshold
+    :documentation "Edge threshold min. Trims the algorithm from processing darks.")
+   (settings
+    :reader fxaa3-settings
+    :documentation "vec3 sent as an uniform"))
+  (:default-initargs
+   :aliasing-removal 0.75
+   :min-contrast     0.166
+   :min-threshold    0.0833))
+
+(defmethod initialize-instance :before ((obj fxaa3) &key aliasing-removal min-contrast min-threshold)
+  (check-type aliasing-removal (float 0      1))      ; off    - default - softer
+  (check-type min-contrast     (float 0.063  0.333))  ; slower - default - faster
+  (check-type min-threshold    (float 0.0312 0.0833))); slower -           faster (default)
+
+(defmethod (setf fxaa3-aliasing-removal) :before (new-value (obj fxaa3))
+  (check-type new-value (float 0 1)))
+(defmethod (setf fxaa3-min-contrast) :before (new-value (obj fxaa3))
+  (check-type new-value (float 0.063 0.333)))
+(defmethod (setf fxaa3-min-threshold) :before (new-value (obj fxaa3))
+  (check-type new-value (float 0.0312 0.0833)))
+
+(defmethod (setf fxaa3-aliasing-removal) :after (new-value (obj fxaa3))
+  (setf (x (slot-value obj 'settings)) new-value))
+(defmethod (setf fxaa3-min-contrast) :after (new-value (obj fxaa3))
+  (setf (y (slot-value obj 'settings)) new-value))
+(defmethod (setf fxaa3-min-threshold) :after (new-value (obj fxaa3))
+  (setf (z (slot-value obj 'settings)) new-value))
+
+(defmethod initialize-instance :after ((obj fxaa3) &key aliasing-removal min-contrast min-threshold)
+  (setf (slot-value obj 'settings)
+        (v! aliasing-removal min-contrast min-threshold)))
+
+(defun-g fxaa3-frag
+    ((uv           :vec2)
+     &uniform
+     (sam          :sampler-2d)
+     (one-over-res :vec2)
+     (settings     :vec3))
+  (nineveh.anti-aliasing:fxaa3
+   uv sam one-over-res (x settings) (y settings) (z settings)))
+
+(defpipeline-g fxaa3-pipe (:points)
+  :fragment (fxaa3-frag :vec2))
+
+(defmethod blit (scene (postprocess fxaa3) camera time)
+  (let ((sam (first (sam (prev *state*)))))
+    (destructuring-bind (width height)
+        (texture-base-dimensions (sampler-texture sam))
+      (map-g #'fxaa3-pipe (bs postprocess)
+             :settings (fxaa3-settings postprocess)
+             :sam (first (sam (prev *state*)))
+             :one-over-res (v! (/ 1 width) (/ 1 height))))))