Moved easing functions into their own file

include/sway/desktop/fx_renderer/animation_utils.h

@@ -0,0 +1,10 @@
+#ifndef ANIMATION_UTILS_H
+#define ANIMATION_UTILS_H
+
+double lerp (double a, double b, double t);
+
+double ease_out_cubic (double t);
+
+// TODO: Add more easing functions in the future like ease_in and ease_in_out, etc...
+
+#endif

sway/desktop/fx_renderer/animation_utils.c

@@ -0,0 +1,12 @@
+#include <math.h>
+
+#include "sway/desktop/fx_renderer/animation_utils.h"
+
+double lerp (double a, double b, double t) {
+	return a * (1.0 - t) + b * t;
+}
+
+double ease_out_cubic (double t) {
+	double p = t - 1;
+	return pow(p, 3) + 1;
+}

sway/desktop/output.c

@@ -19,6 +19,7 @@
 #include "config.h"
 #include "log.h"
 #include "sway/config.h"
+#include "sway/desktop/fx_renderer/animation_utils.h"
 #include "sway/desktop/transaction.h"
 #include "sway/input/input-manager.h"
 #include "sway/input/seat.h"
@@ -1108,15 +1109,6 @@ void handle_output_power_manager_set_mode(struct wl_listener *listener,
 	apply_output_config(oc, output);
 }
 
-static double lerp (double a, double b, double t) {
-	return a * (1.0 - t) + b * t;
-}
-
-static double ease_out_cubic (double t) {
-	double p = t - 1;
-	return pow(p, 3) + 1;
-}
-
 struct workspace_scroll workspace_scroll_get_default() {
 	return (struct workspace_scroll) {
 		.percent = 0,

sway/meson.build

@@ -20,6 +20,7 @@ sway_sources = files(
 	'desktop/fx_renderer/fx_stencilbuffer.c',
 	'desktop/fx_renderer/fx_texture.c',
 	'desktop/fx_renderer/matrix.c',
+	'desktop/fx_renderer/animation_utils.c',
 	'desktop/idle_inhibit_v1.c',
 	'desktop/layer_shell.c',
 	'desktop/output.c',