From 43b4b34376cdea486906f8bb4058dda3be7e1bd8 Mon Sep 17 00:00:00 2001
From: riperiperi <rhy3756547@hotmail.com>
Date: Thu, 12 May 2022 14:47:13 +0100
Subject: Implement Viewport Transform Disable (#3328)

* Initial implementation (no specialization)

* Use specialization

* Fix render scale, increase code gen version

* Revert accidental change

* Address Feedback
---
 .../Instructions/InstEmitAttribute.cs              | 28 +++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

(limited to 'Ryujinx.Graphics.Shader/Instructions')

diff --git a/Ryujinx.Graphics.Shader/Instructions/InstEmitAttribute.cs b/Ryujinx.Graphics.Shader/Instructions/InstEmitAttribute.cs
index 1cdb3842..6ce2e537 100644
--- a/Ryujinx.Graphics.Shader/Instructions/InstEmitAttribute.cs
+++ b/Ryujinx.Graphics.Shader/Instructions/InstEmitAttribute.cs
@@ -206,7 +206,33 @@ namespace Ryujinx.Graphics.Shader.Instructions
 
             if (emit)
             {
-                context.EmitVertex();
+                if (context.Config.LastInVertexPipeline)
+                {
+                    context.PrepareForVertexReturn(out var tempXLocal, out var tempYLocal, out var tempZLocal);
+
+                    context.EmitVertex();
+
+                    // Restore output position value before transformation.
+
+                    if (tempXLocal != null)
+                    {
+                        context.Copy(Attribute(AttributeConsts.PositionX), tempXLocal);
+                    }
+
+                    if (tempYLocal != null)
+                    {
+                        context.Copy(Attribute(AttributeConsts.PositionY), tempYLocal);
+                    }
+
+                    if (tempZLocal != null)
+                    {
+                        context.Copy(Attribute(AttributeConsts.PositionZ), tempZLocal);
+                    }
+                }
+                else
+                {
+                    context.EmitVertex();
+                }
             }
 
             if (cut)
-- 
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