[libadwaita/wip/exalm/tab-style: 9/11] fade: Add width params

[Alexander Mikhaylenko <alexm src gnome org>]

commit bc100a25ceef299ea4a5b6eef6196de1dede2b27
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Apr 6 17:45:46 2022 +0400

    fade: Add width params
    
    We'll need to change the width for tab box.

 src/adw-fading-label.c | 4 +++-
 src/adw-tab.c          | 4 +++-
 src/glsl/fade.glsl     | 8 ++++----
 3 files changed, 10 insertions(+), 6 deletions(-)
---
diff --git a/src/adw-fading-label.c b/src/adw-fading-label.c
index e9a685e1..91982904 100644
--- a/src/adw-fading-label.c
+++ b/src/adw-fading-label.c
@@ -13,7 +13,7 @@
 #include "adw-bidi-private.h"
 #include "adw-macros-private.h"
 
-#define FADE_WIDTH 18
+#define FADE_WIDTH 18.0f
 
 struct _AdwFadingLabel
 {
@@ -161,6 +161,8 @@ adw_fading_label_snapshot (GtkWidget   *widget,
                                                             "offsetRight", 0.0f,
                                                             "strengthLeft", align > 0 ? 1.0f : 0.0f,
                                                             "strengthRight", align < 1 ? 1.0f : 0.0f,
+                                                            "widthLeft", FADE_WIDTH,
+                                                            "widthRight", FADE_WIDTH,
                                                             NULL));
   } else {
     gtk_snapshot_push_clip (snapshot, &bounds);
diff --git a/src/adw-tab.c b/src/adw-tab.c
index 6d8a8ebd..36978829 100644
--- a/src/adw-tab.c
+++ b/src/adw-tab.c
@@ -14,7 +14,7 @@
 #include "adw-macros-private.h"
 #include "adw-timed-animation.h"
 
-#define FADE_WIDTH 18
+#define FADE_WIDTH 18.0f
 #define CLOSE_BTN_ANIMATION_DURATION 150
 
 #define BASE_WIDTH 118
@@ -553,6 +553,8 @@ adw_tab_snapshot (GtkWidget   *widget,
                                                               "offsetRight", is_rtl ? 0.0f : offset,
                                                               "strengthLeft", is_rtl ? opacity : 0.0f,
                                                               "strengthRight", is_rtl ? 0.0f : opacity,
+                                                              "widthLeft", FADE_WIDTH,
+                                                              "widthRight", FADE_WIDTH,
                                                               NULL));
     } else {
       bounds.size.width -= offset;
diff --git a/src/glsl/fade.glsl b/src/glsl/fade.glsl
index 3d99c221..0953d5b5 100644
--- a/src/glsl/fade.glsl
+++ b/src/glsl/fade.glsl
@@ -2,11 +2,11 @@ uniform float offsetLeft;
 uniform float offsetRight;
 uniform float strengthLeft;
 uniform float strengthRight;
+uniform float widthLeft;
+uniform float widthRight;
 
 uniform sampler2D u_texture1;
 
-#define FADE_WIDTH 18
-
 void
 mainImage (out vec4 fragColor,
            in vec2  fragCoord,
@@ -18,10 +18,10 @@ mainImage (out vec4 fragColor,
   fragColor = GskTexture (u_texture1, uv);
 
   progress = fragCoord.x - offsetLeft;
-  progress = min (max (progress / FADE_WIDTH, 0), 1);
+  progress = min (max (progress / widthLeft, 0), 1);
   fragColor *= (1 + strengthLeft * (progress - 1));
 
   progress = resolution.x - offsetRight - fragCoord.x;
-  progress = min (max (progress / FADE_WIDTH, 0), 1);
+  progress = min (max (progress / widthRight, 0), 1);
   fragColor *= (1 + strengthRight * (progress - 1));
 }