From 4f05a74aa84bca74b650cffdc7ad889413f621cf Mon Sep 17 00:00:00 2001
From: Ivan Molodetskikh <yalterz@gmail.com>
Date: Sat, 8 Feb 2025 13:33:28 +0300
Subject: Add alpha parameter to shaders

Lets us add extra opacity.
---
 src/render_helpers/border.rs         | 8 ++++++++
 src/render_helpers/shader_element.rs | 2 ++
 src/render_helpers/shadow.rs         | 8 ++++++++
 3 files changed, 18 insertions(+)

(limited to 'src/render_helpers')

diff --git a/src/render_helpers/border.rs b/src/render_helpers/border.rs
index c0ab6663..588e53b1 100644
--- a/src/render_helpers/border.rs
+++ b/src/render_helpers/border.rs
@@ -39,6 +39,7 @@ struct Parameters {
     corner_radius: CornerRadius,
     // Should only be used for visual improvements, i.e. corner radius anti-aliasing.
     scale: f32,
+    alpha: f32,
 }
 
 impl BorderRenderElement {
@@ -54,6 +55,7 @@ impl BorderRenderElement {
         border_width: f32,
         corner_radius: CornerRadius,
         scale: f32,
+        alpha: f32,
     ) -> Self {
         let inner = ShaderRenderElement::empty(ProgramType::Border, Kind::Unspecified);
         let mut rv = Self {
@@ -69,6 +71,7 @@ impl BorderRenderElement {
                 border_width,
                 corner_radius,
                 scale,
+                alpha,
             },
         };
         rv.update_inner();
@@ -90,6 +93,7 @@ impl BorderRenderElement {
                 border_width: 0.,
                 corner_radius: Default::default(),
                 scale: 1.,
+                alpha: 1.,
             },
         }
     }
@@ -111,6 +115,7 @@ impl BorderRenderElement {
         border_width: f32,
         corner_radius: CornerRadius,
         scale: f32,
+        alpha: f32,
     ) {
         let params = Parameters {
             size,
@@ -123,6 +128,7 @@ impl BorderRenderElement {
             border_width,
             corner_radius,
             scale,
+            alpha,
         };
         if self.params == params {
             return;
@@ -144,6 +150,7 @@ impl BorderRenderElement {
             border_width,
             corner_radius,
             scale,
+            alpha,
         } = self.params;
 
         let grad_offset = geometry.loc - gradient_area.loc;
@@ -189,6 +196,7 @@ impl BorderRenderElement {
             size,
             None,
             scale,
+            alpha,
             vec![
                 Uniform::new("colorspace", colorspace),
                 Uniform::new("hue_interpolation", hue_interpolation),
diff --git a/src/render_helpers/shader_element.rs b/src/render_helpers/shader_element.rs
index 2ec100ba..be3ccec6 100644
--- a/src/render_helpers/shader_element.rs
+++ b/src/render_helpers/shader_element.rs
@@ -227,12 +227,14 @@ impl ShaderRenderElement {
         size: Size<f64, Logical>,
         opaque_regions: Option<Vec<Rectangle<f64, Logical>>>,
         scale: f32,
+        alpha: f32,
         uniforms: Vec<Uniform<'static>>,
         textures: HashMap<String, GlesTexture>,
     ) {
         self.area.size = size;
         self.opaque_regions = opaque_regions.unwrap_or_default();
         self.scale = scale;
+        self.alpha = alpha;
         self.additional_uniforms = uniforms;
         self.textures = textures;
 
diff --git a/src/render_helpers/shadow.rs b/src/render_helpers/shadow.rs
index b98202e4..332703a0 100644
--- a/src/render_helpers/shadow.rs
+++ b/src/render_helpers/shadow.rs
@@ -28,6 +28,7 @@ struct Parameters {
     corner_radius: CornerRadius,
     // Should only be used for visual improvements, i.e. corner radius anti-aliasing.
     scale: f32,
+    alpha: f32,
 
     window_geometry: Rectangle<f64, Logical>,
     window_corner_radius: CornerRadius,
@@ -44,6 +45,7 @@ impl ShadowRenderElement {
         scale: f32,
         window_geometry: Rectangle<f64, Logical>,
         window_corner_radius: CornerRadius,
+        alpha: f32,
     ) -> Self {
         let inner = ShaderRenderElement::empty(ProgramType::Shadow, Kind::Unspecified);
         let mut rv = Self {
@@ -55,6 +57,7 @@ impl ShadowRenderElement {
                 sigma,
                 corner_radius,
                 scale,
+                alpha,
                 window_geometry,
                 window_corner_radius,
             },
@@ -74,6 +77,7 @@ impl ShadowRenderElement {
                 sigma: 0.,
                 corner_radius: Default::default(),
                 scale: 1.,
+                alpha: 1.,
                 window_geometry: Default::default(),
                 window_corner_radius: Default::default(),
             },
@@ -95,12 +99,14 @@ impl ShadowRenderElement {
         scale: f32,
         window_geometry: Rectangle<f64, Logical>,
         window_corner_radius: CornerRadius,
+        alpha: f32,
     ) {
         let params = Parameters {
             size,
             geometry,
             color,
             sigma,
+            alpha,
             corner_radius,
             scale,
             window_geometry,
@@ -120,6 +126,7 @@ impl ShadowRenderElement {
             geometry,
             color,
             sigma,
+            alpha,
             corner_radius,
             scale,
             window_geometry,
@@ -145,6 +152,7 @@ impl ShadowRenderElement {
             size,
             None,
             scale,
+            alpha,
             vec![
                 Uniform::new("shadow_color", color.to_array_premul()),
                 Uniform::new("sigma", sigma),
-- 
cgit