[temp] got the idea why cannot make blur effect.

This shit shader should run twice.
karaoke-dev · Apr 16, 2022 · 5ef92e8 · 5ef92e8
1 parent 030bb8f
commit 5ef92e8
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Showing 2 changed files with 19 additions and 7 deletions.
diff --git a/osu.Framework.Font.Tests/Visual/Shaders/TestSceneDefaultKaraokeLyricShader.cs b/osu.Framework.Font.Tests/Visual/Shaders/TestSceneDefaultKaraokeLyricShader.cs
@@ -5,13 +5,15 @@
 using osu.Framework.Extensions;
 using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics.Shaders;
+using osuTK;
 
 namespace osu.Framework.Font.Tests.Visual.Shaders
 {
     public class TestSceneDefaultKaraokeLyricShader : TestSceneInternalShader
     {
-        [TestCase("#FFFF00", 10, "#FFFF00")]
-        [TestCase("#FF0000", 20, "#FFFFFF")]
+        [TestCase("#FFFFFF", 10, "#0000FF")] // White text with blue outline
+        [TestCase("#FF0000", 5, "#FFFFFF")] // Red text with white outline
+        [TestCase("#FF0000", 0, "#FFFFFF")] // Red text with no outline
         public void TestOutline(string colour, int radius, string outlineColour)
         {
             AddStep("Apply shader", () =>
@@ -23,6 +25,9 @@ public void TestOutline(string colour, int radius, string outlineColour)
                         s.Colour = Color4Extensions.FromHex(colour);
                         s.Radius = radius;
                         s.OutlineColour = Color4Extensions.FromHex(outlineColour);
+
+                        s.ShadowSigma = 200;
+                        s.ShadowOffset = new Vector2(0, 1);
                     })
                 };
             });

diff --git a/osu.Framework.Font/Resources/Shaders/sh_DefaultKaraokeLyric.fs b/osu.Framework.Font/Resources/Shaders/sh_DefaultKaraokeLyric.fs
@@ -15,7 +15,6 @@ uniform vec4 g_OutlineColour;
 
 // shadow effect
 uniform mediump float g_Sigma;
-uniform highp vec2 g_BlurDirection;
 
 mediump float computeGauss(in mediump float x, in mediump float sigma)
 {
@@ -43,10 +42,18 @@ lowp vec4 blur(sampler2D tex, int radius, highp vec2 direction, mediump vec2 tex
     return toSRGB(sum / totalFactor);
 }
 
+lowp vec4 outline()
+{
+	return blur(m_Sampler, g_Radius, highp vec2(1, 0), v_TexCoord, g_TexSize, g_Sigma) 
+			+ blur(m_Sampler, g_Radius, highp vec2(0, -1), v_TexCoord, g_TexSize, g_Sigma);
+}
+
 void main(void)
 {
-	mediump vec4 originTexture = texture2D(m_Sampler, v_TexCoord) * g_Colour;
-	lowp vec4 outline = blur(m_Sampler, g_Radius, g_BlurDirection, v_TexCoord, g_TexSize, g_Sigma) * g_OutlineColour;
-	lowp vec4 shadow = blur(m_Sampler, g_Radius, g_BlurDirection, v_TexCoord, g_TexSize, g_Sigma);
-	gl_FragColor = originTexture;
+	mediump vec4 originTexture = texture2D(m_Sampler, v_TexCoord).a * g_Colour;
+	lowp vec4 outline = outline().a * g_OutlineColour;
+	lowp vec4 shadow = blur(m_Sampler, g_Radius, highp vec2(0, 1), v_TexCoord, g_TexSize, g_Sigma);
+
+
+	gl_FragColor = blur(m_Sampler, g_Radius, highp vec2(0, -1), v_TexCoord, g_TexSize, g_Sigma);
 }