Merge pull request #69 from andy840119/pixel-shader

Implement pixel shader
karaoke-dev · Oct 23, 2021 · 17f5950 · 17f5950
2 parents d78ce91 + b0cc931
commit 17f5950
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Showing 6 changed files with 101 additions and 16 deletions.
diff --git a/osu.Framework.Font.Tests/Visual/BackgroundGridTestSample.cs b/osu.Framework.Font.Tests/Visual/BackgroundGridTestSample.cs
@@ -83,28 +83,12 @@ protected IShader GetShader(string shaderName)
         protected T GetShaderByType<T>() where T : class, ICustomizedShader
             => shaderManager.LocalCustomizedShader<T>();
 
-        protected class DraggableBox : Box
-        {
-            protected override bool OnDragStart(DragStartEvent e) => true;
-
-            protected override void OnDrag(DragEvent e)
-                => Position += e.Delta;
-        }
-
         protected class DraggableCircle : Circle
         {
             protected override bool OnDragStart(DragStartEvent e) => true;
 
             protected override void OnDrag(DragEvent e)
                 => Position += e.Delta;
         }
-
-        protected class DraggableTriangle : Triangle
-        {
-            protected override bool OnDragStart(DragStartEvent e) => true;
-
-            protected override void OnDrag(DragEvent e)
-                => Position += e.Delta;
-        }
     }
 }
diff --git a/osu.Framework.Font.Tests/Visual/Shaders/CustomizedShaderTestScene.cs b/osu.Framework.Font.Tests/Visual/Shaders/CustomizedShaderTestScene.cs
@@ -6,6 +6,7 @@
 using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Font.Tests.Helper;
 using osu.Framework.Graphics.Shaders;
+using osuTK;
 
 namespace osu.Framework.Font.Tests.Visual.Shaders
 {
@@ -72,5 +73,22 @@ public void TestRainbowShader(string uv, float speed, float saturation, float br
                 };
             });
         }
+
+        [TestCase(5, 5)]
+        [TestCase(5, 20)]
+        [TestCase(20, 20)]
+        public void TestPixelShader(float x, float y)
+        {
+            AddStep("Apply shader", () =>
+            {
+                ShaderContainer.Shaders = new[]
+                {
+                    GetShaderByType<PixelShader>().With(s =>
+                    {
+                        s.Size = new Vector2(x, y);
+                    })
+                };
+            });
+        }
     }
 }
diff --git a/osu.Framework.Font.Tests/Visual/Shaders/ShaderTestScene.cs b/osu.Framework.Font.Tests/Visual/Shaders/ShaderTestScene.cs
@@ -7,6 +7,8 @@
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shaders;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Input.Events;
 using osuTK;
 using osuTK.Graphics;
 
@@ -48,6 +50,15 @@ protected ShaderTestScene()
                         Origin = Anchor.Centre,
                         Colour = Color4.Green,
                     },
+                    new DraggableText
+                    {
+                        X = -100,
+                        Y = 50,
+                        Text = "CA",
+                        Font = FontUsage.Default.With(size: 72),
+                        Anchor = Anchor.Centre,
+                        Origin = Anchor.Centre,
+                    },
                     createBorderBox("Left up cube", Anchor.TopLeft),
                     createBorderBox("Right up cube", Anchor.TopRight),
                     createBorderBox("Left down cube", Anchor.BottomLeft),
@@ -66,6 +77,30 @@ static Box createBorderBox(string name, Anchor position)
                 };
         }
 
+        protected class DraggableBox : Box
+        {
+            protected override bool OnDragStart(DragStartEvent e) => true;
+
+            protected override void OnDrag(DragEvent e)
+                => Position += e.Delta;
+        }
+
+        protected class DraggableTriangle : Triangle
+        {
+            protected override bool OnDragStart(DragStartEvent e) => true;
+
+            protected override void OnDrag(DragEvent e)
+                => Position += e.Delta;
+        }
+
+        protected class DraggableText : SpriteText
+        {
+            protected override bool OnDragStart(DragStartEvent e) => true;
+
+            protected override void OnDrag(DragEvent e)
+                => Position += e.Delta;
+        }
+
         protected class TestShaderContainer : Container, IMultiShaderBufferedDrawable
         {
             public IShader TextureShader { get; private set; }

diff --git a/osu.Framework.Font/Extensions/ShaderManagerExtensions.cs b/osu.Framework.Font/Extensions/ShaderManagerExtensions.cs
@@ -17,6 +17,7 @@ public static T LocalCustomizedShader<T>(this ShaderManager shaderManager) where
                 Type _ when type == typeof(OutlineShader) => new OutlineShader(shaderManager.Load(VertexShaderDescriptor.TEXTURE_2, OutlineShader.SHADER_NAME)) as T,
                 Type _ when type == typeof(RainbowShader) => new RainbowShader(shaderManager.Load(VertexShaderDescriptor.TEXTURE_2, RainbowShader.SHADER_NAME)) as T,
                 Type _ when type == typeof(ShadowShader) => new ShadowShader(shaderManager.Load(VertexShaderDescriptor.TEXTURE_2, ShadowShader.SHADER_NAME)) as T,
+                Type _ when type == typeof(PixelShader) => new PixelShader(shaderManager.Load(VertexShaderDescriptor.TEXTURE_2, PixelShader.SHADER_NAME)) as T,
                 _ => throw new NotImplementedException()
             };
         }

diff --git a/osu.Framework.Font/Graphics/Shaders/PixelShader.cs b/osu.Framework.Font/Graphics/Shaders/PixelShader.cs
@@ -0,0 +1,29 @@
+// Copyright (c) andy840119 <[email protected]>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Graphics.OpenGL.Buffers;
+using osuTK;
+
+namespace osu.Framework.Graphics.Shaders
+{
+    public class PixelShader : CustomizedShader
+    {
+        public const string SHADER_NAME = "Pixel";
+
+        public Vector2 Size { get; set; } = new Vector2(5);
+
+        public PixelShader(IShader originShader)
+            : base(originShader)
+        {
+        }
+
+        public override void ApplyValue(FrameBuffer current)
+        {
+            var size = Size;
+            GetUniform<Vector2>(@"g_Size").UpdateValue(ref size);
+
+            var textureSize = current.Size;
+            GetUniform<Vector2>(@"g_TexSize").UpdateValue(ref textureSize);
+        }
+    }
+}
diff --git a/osu.Framework.Font/Resources/Shaders/sh_Pixel.fs b/osu.Framework.Font/Resources/Shaders/sh_Pixel.fs
@@ -0,0 +1,18 @@
+// see the demo: https://www.geeks3d.com/20101029/shader-library-pixelation-post-processing-effect-glsl/
+
+varying mediump vec2 v_TexCoord;
+
+uniform lowp sampler2D m_Sampler;
+
+uniform mediump vec2 g_TexSize;
+uniform mediump vec2 g_Size;
+
+void main(void) 
+{ 
+	vec2 separaorParts = g_TexSize / g_Size;
+	vec2 uv = v_TexCoord;
+	uv = uv * separaorParts;
+    uv = floor(uv);
+    uv = uv / separaorParts;
+    gl_FragColor = texture2D(m_Sampler, uv);
+}