Implement clear buffer (fast path) (#1902)

* Implement clear buffer (fast path)

* Remove blank line

Ryujinx.Graphics.Gpu/State/BufferSwizzleComponent.cs

@@ -0,0 +1,16 @@
+namespace Ryujinx.Graphics.Gpu.State
+{
+    /// <summary>
+    /// Buffer swizzle component.
+    /// </summary>
+    enum BufferSwizzleComponent
+    {
+        SrcX,
+        SrcY,
+        SrcZ,
+        SrcW,
+        ConstA,
+        ConstB,
+        NoWrite
+    }
+}

Ryujinx.Graphics.Gpu/State/CopyBufferSwizzle.cs

@@ -9,6 +9,42 @@ namespace Ryujinx.Graphics.Gpu.State
         public uint Swizzle;
 #pragma warning restore CS0649
 
+        /// <summary>
+        /// Unpacks the source for the buffer destination vector X component.
+        /// </summary>
+        /// <returns>Destination component</returns>
+        public BufferSwizzleComponent UnpackDstX()
+        {
+            return (BufferSwizzleComponent)(Swizzle & 7);
+        }
+
+        /// <summary>
+        /// Unpacks the source for the buffer destination vector Y component.
+        /// </summary>
+        /// <returns>Destination component</returns>
+        public BufferSwizzleComponent UnpackDstY()
+        {
+            return (BufferSwizzleComponent)((Swizzle >> 4) & 7);
+        }
+
+        /// <summary>
+        /// Unpacks the source for the buffer destination vector Z component.
+        /// </summary>
+        /// <returns>Destination component</returns>
+        public BufferSwizzleComponent UnpackDstZ()
+        {
+            return (BufferSwizzleComponent)((Swizzle >> 8) & 7);
+        }
+
+        /// <summary>
+        /// Unpacks the source for the buffer destination vector W component.
+        /// </summary>
+        /// <returns>Destination component</returns>
+        public BufferSwizzleComponent UnpackDstW()
+        {
+            return (BufferSwizzleComponent)((Swizzle >> 12) & 7);
+        }
+
         /// <summary>
         /// Unpacks the size of each vector component of the copy.
         /// </summary>

Ryujinx.Graphics.Gpu/State/MethodOffset.cs

@@ -23,6 +23,8 @@ namespace Ryujinx.Graphics.Gpu.State
         TfBufferState                   = 0xe0,
         CopyBufferParams                = 0x100,
         TfState                         = 0x1c0,
+        CopyBufferConstA                = 0x1c0,
+        CopyBufferConstB                = 0x1c1,
         CopyBufferSwizzle               = 0x1c2,
         CopyBufferDstTexture            = 0x1c3,
         CopyBufferSrcTexture            = 0x1ca,