Make triangles opaque.

osu.Game/Beatmaps/Drawables/BeatmapPanel.cs

@@ -27,6 +27,7 @@ class BeatmapPanel : Panel
 
         public Action<BeatmapPanel> GainedSelection;
         public Action<BeatmapPanel> StartRequested;
+        private Triangles triangles;
 
         protected override void Selected()
         {
@@ -36,6 +37,8 @@ protected override void Selected()
             background.ColourInfo = ColourInfo.GradientVertical(
                 new Color4(20, 43, 51, 255),
                 new Color4(40, 86, 102, 255));
+
+            triangles.Colour = Color4.White;
         }
 
         protected override void Deselected()
@@ -43,6 +46,7 @@ protected override void Deselected()
             base.Deselected();
 
             background.Colour = new Color4(20, 43, 51, 255);
+            triangles.Colour = OsuColour.Gray(0.5f);
         }
 
         protected override bool OnClick(InputState state)
@@ -64,15 +68,11 @@ public BeatmapPanel(BeatmapInfo beatmap)
                 {
                     RelativeSizeAxes = Axes.Both,
                 },
-                new Triangles
+                triangles = new Triangles
                 {
-                    // The border is drawn in the shader of the children. Being additive, triangles would over-emphasize
-                    // the border wherever they cross it, and thus they get their own masking container without a border.
-                    Masking = true,
-                    CornerRadius = Content.CornerRadius,
                     RelativeSizeAxes = Axes.Both,
-                    BlendingMode = BlendingMode.Additive,
-                    Colour = new Color4(20, 43, 51, 255),
+                    ColourLight = OsuColour.FromHex(@"3a7285"),
+                    ColourDark = OsuColour.FromHex(@"123744")
                 },
                 new FlowContainer
                 {

osu.Game/Graphics/Backgrounds/Triangles.cs

@@ -10,6 +10,7 @@
 using osu.Framework.Graphics.Textures;
 using osu.Framework.MathUtils;
 using OpenTK;
+using OpenTK.Graphics;
 
 namespace osu.Game.Graphics.Backgrounds
 {
@@ -17,10 +18,8 @@ public class Triangles : Container<Triangle>
     {
         public override bool HandleInput => false;
 
-        public Triangles()
-        {
-            Alpha = 0.3f;
-        }
+        public Color4 ColourLight = Color4.White;
+        public Color4 ColourDark = Color4.Black;
 
         private float triangleScale = 1;
 
@@ -65,12 +64,14 @@ protected virtual Triangle CreateTriangle()
                 RelativePositionAxes = Axes.Both,
                 Scale = new Vector2(scale),
                 // Scaling height by 0.866 results in equiangular triangles (== 60° and equal side length)
+                Colour = GetTriangleShade(),
                 Size = new Vector2(size, 0.866f * size),
-                Alpha = RNG.NextSingle(),
                 Depth = scale,
             };
         }
 
+        protected virtual Color4 GetTriangleShade() => Interpolation.ValueAt(RNG.NextSingle(), ColourDark, ColourLight, 0, 1);
+
         private void addTriangle(bool randomX)
         {
             var sprite = CreateTriangle();

osu.Game/Screens/Menu/OsuLogo.cs

@@ -110,8 +110,11 @@ public OsuLogo()
                                                             RelativeSizeAxes = Axes.Both,
                                                             Colour = OsuPink,
                                                         },
-                                                        new OsuLogoTriangles
+                                                        new Triangles
                                                         {
+                                                            TriangleScale = 4,
+                                                            ColourLight = OsuColour.FromHex(@"ff7db7"),
+                                                            ColourDark = OsuColour.FromHex(@"de5b95"),
                                                             RelativeSizeAxes = Axes.Both,
                                                         },
                                                     }
@@ -218,35 +221,5 @@ protected override void OnHoverLost(InputState state)
         {
             logoHoverContainer.ScaleTo(1, 500, EasingTypes.OutElastic);
         }
-
-        class OsuLogoTriangles : Triangles
-        {
-            public Color4 OsuPinkLight = OsuColour.FromHex(@"ff7db7");
-            public Color4 OsuPinkDark = OsuColour.FromHex(@"de5b95");
-
-            public OsuLogoTriangles()
-            {
-                TriangleScale = 4;
-                Alpha = 1;
-
-            }
-            
-            protected override Triangle CreateTriangle()
-            {
-                var triangle = base.CreateTriangle();
-                triangle.Alpha = 1;
-                triangle.Colour = getTriangleShade();
-                return triangle;
-            }
-
-            private Color4 getTriangleShade()
-            {
-                float val = RNG.NextSingle();
-                return Interpolation.ValueAt(val,
-                    OsuPinkDark,
-                    OsuPinkLight,
-                    0, 1);
-            }
-        }
     }
 }