Add dotted line shader.

osu.Game.Resources/Shaders/sh_DottedLine.fs

@@ -0,0 +1,40 @@
+#ifdef GL_ES
+    precision mediump float;
+#endif
+
+#include "sh_Utils.h"
+
+varying vec4 v_Colour;
+
+uniform vec2 g_Position;
+uniform vec2 g_Size;
+
+uniform float g_Period;
+uniform float g_PeriodOffset;
+
+uniform float g_StrokeWidth;
+uniform float g_StrokeHeight;
+uniform float g_Separation;
+
+void main(void)
+{
+	float xVisible = mod(gl_FragCoord.x, g_StrokeWidth + g_Separation);
+
+	if (xVisible > g_StrokeWidth)
+	{
+		gl_FragColor = vec4(0.0);
+		return;
+	}
+
+	// Normalized 
+	float normalizedY = gl_FragCoord.y - g_Position.y;
+	float yVisible = abs(normalizedY - ((g_Size.y / 2.0 - g_StrokeHeight / 2.0) * sin(g_Period / g_Size.x * gl_FragCoord.x + g_PeriodOffset) + g_Size.y / 2.0));
+
+	if (yVisible > g_StrokeHeight / 2.0)
+	{
+		gl_FragColor = vec4(0.0);
+		return;
+	}
+
+	gl_FragColor = toSRGB(v_Colour);
+}

osu.Game.Resources/osu.Game.Resources.csproj

@@ -588,6 +588,9 @@
     <EmbeddedResource Include="Textures\Flags\ZW.png" />
     <EmbeddedResource Include="Textures\Flags\__.png" />
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Shaders\sh_DottedLine.fs" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
        Other similar extension points exist, see Microsoft.Common.targets.