Implement clear buffer (fast path) (#1902)

* Implement clear buffer (fast path)

* Remove blank line

1 files changed, 18 insertions, 2 deletions

diff --git a/Ryujinx.Graphics.Gpu/Engine/MethodCopyBuffer.cs b/Ryujinx.Graphics.Gpu/Engine/MethodCopyBuffer.cs
index 6f03dc5d..15ebb236 100644
--- a/Ryujinx.Graphics.Gpu/Engine/MethodCopyBuffer.cs
+++ b/Ryujinx.Graphics.Gpu/Engine/MethodCopyBuffer.cs
@@ -200,8 +200,24 @@ namespace Ryujinx.Graphics.Gpu.Engine
             }
             else
             {
-                // Buffer to buffer copy.
-                BufferManager.CopyBuffer(cbp.SrcAddress, cbp.DstAddress, (uint)size);
+                if (remap &&
+                    swizzle.UnpackDstX() == BufferSwizzleComponent.ConstA &&
+                    swizzle.UnpackDstY() == BufferSwizzleComponent.ConstA &&
+                    swizzle.UnpackDstZ() == BufferSwizzleComponent.ConstA &&
+                    swizzle.UnpackDstW() == BufferSwizzleComponent.ConstA &&
+                    swizzle.UnpackSrcComponentsCount() == 1 &&
+                    swizzle.UnpackDstComponentsCount() == 1 &&
+                    swizzle.UnpackComponentSize() == 4)
+                {
+                    // Fast path for clears when remap is enabled.
+                    BufferManager.ClearBuffer(cbp.DstAddress, (uint)size * 4, state.Get<uint>(MethodOffset.CopyBufferConstA));
+                }
+                else
+                {
+                    // TODO: Implement remap functionality.
+                    // Buffer to buffer copy.
+                    BufferManager.CopyBuffer(cbp.SrcAddress, cbp.DstAddress, (uint)size);
+                }
             }
         }
     }