Implement clear buffer (fast path) (#1902)

* Implement clear buffer (fast path)

* Remove blank line

2 files changed, 29 insertions, 3 deletions

diff --git a/Ryujinx.Graphics.OpenGL/Buffer.cs b/Ryujinx.Graphics.OpenGL/Buffer.cs
index 89216b83..ecb7dc90 100644
--- a/Ryujinx.Graphics.OpenGL/Buffer.cs
+++ b/Ryujinx.Graphics.OpenGL/Buffer.cs
@@ -6,6 +6,27 @@ namespace Ryujinx.Graphics.OpenGL
 {
     static class Buffer
     {
+        public static void Clear(BufferHandle destination, int offset, int size, uint value)
+        {
+            GL.BindBuffer(BufferTarget.CopyWriteBuffer, destination.ToInt32());
+
+            unsafe
+            {
+                uint* valueArr = stackalloc uint[1];
+
+                valueArr[0] = value;
+
+                GL.ClearBufferSubData(
+                    BufferTarget.CopyWriteBuffer,
+                    PixelInternalFormat.Rgba8ui,
+                    (IntPtr)offset,
+                    (IntPtr)size,
+                    PixelFormat.RgbaInteger,
+                    PixelType.UnsignedByte,
+                    (IntPtr)valueArr);
+            }
+        }
+
         public static BufferHandle Create()
         {
             return Handle.FromInt32<BufferHandle>(GL.GenBuffer());
diff --git a/Ryujinx.Graphics.OpenGL/Pipeline.cs b/Ryujinx.Graphics.OpenGL/Pipeline.cs
index 8b0a86aa..b6a34e9c 100644
--- a/Ryujinx.Graphics.OpenGL/Pipeline.cs
+++ b/Ryujinx.Graphics.OpenGL/Pipeline.cs
@@ -91,6 +91,11 @@ namespace Ryujinx.Graphics.OpenGL
             _tfEnabled = true;
         }
 
+        public void ClearBuffer(BufferHandle destination, int offset, int size, uint value)
+        {
+            Buffer.Clear(destination, offset, size, value);
+        }
+
         public void ClearRenderTargetColor(int index, uint componentMask, ColorF color)
         {
             GL.ColorMask(
@@ -102,7 +107,7 @@ namespace Ryujinx.Graphics.OpenGL
 
             float[] colors = new float[] { color.Red, color.Green, color.Blue, color.Alpha };
 
-            GL.ClearBuffer(ClearBuffer.Color, index, colors);
+            GL.ClearBuffer(OpenTK.Graphics.OpenGL.ClearBuffer.Color, index, colors);
 
             RestoreComponentMask(index);
 
@@ -133,11 +138,11 @@ namespace Ryujinx.Graphics.OpenGL
             }
             else if (depthMask)
             {
-                GL.ClearBuffer(ClearBuffer.Depth, 0, ref depthValue);
+                GL.ClearBuffer(OpenTK.Graphics.OpenGL.ClearBuffer.Depth, 0, ref depthValue);
             }
             else if (stencilMask != 0)
             {
-                GL.ClearBuffer(ClearBuffer.Stencil, 0, ref stencilValue);
+                GL.ClearBuffer(OpenTK.Graphics.OpenGL.ClearBuffer.Stencil, 0, ref stencilValue);
             }
 
             if (stencilMaskChanged)