From 767f56d7c8294e0af6163065714f46d9794d9002 Mon Sep 17 00:00:00 2001
From: Preston Smith <preston.s1993@gmail.com>
Date: Sun, 13 Mar 2016 03:38:44 -0400
Subject: [PATCH] Software renderer fix

---
 .../VideoBackends/Software/TransformUnit.cpp  | 25 ++++++++++++++++---
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/Source/Core/VideoBackends/Software/TransformUnit.cpp b/Source/Core/VideoBackends/Software/TransformUnit.cpp
index 57492cc326..0ab93ce106 100644
--- a/Source/Core/VideoBackends/Software/TransformUnit.cpp
+++ b/Source/Core/VideoBackends/Software/TransformUnit.cpp
@@ -147,14 +147,14 @@ static void TransformTexCoordRegular(const TexMtxInfo& texinfo, int coordNum, bo
       MultiplyVec3Mat34(*src, mat, *dst);
   }
 
+  // normalize
+  const PostMtxInfo& postInfo = xfmem.postMtxInfo[coordNum];
+  const float* postMat = &xfmem.postMatrices[postInfo.index * 4];
+
   if (xfmem.dualTexTrans.enabled)
   {
     Vec3 tempCoord;
 
-    // normalize
-    const PostMtxInfo& postInfo = xfmem.postMtxInfo[coordNum];
-    const float* postMat = &xfmem.postMatrices[postInfo.index * 4];
-
     if (specialCase)
     {
       // no normalization
@@ -177,6 +177,23 @@ static void TransformTexCoordRegular(const TexMtxInfo& texinfo, int coordNum, bo
       MultiplyVec3Mat34(tempCoord, postMat, *dst);
     }
   }
+
+  // TODO write comment
+  if(dst->z == 0.0f)
+  {
+    if(mat[8] != 0.0f || (xfmem.dualTexTrans.enabled && postMat[8] != 0.0f) ||
+       mat[9] != 0.0f || (xfmem.dualTexTrans.enabled && postMat[9] != 0.0f))
+    {
+      // TODO test this case more
+      dst->x = 0.0f;
+      dst->y = 0.0f;
+    }
+    else
+    {
+      dst->x = MathUtil::Clamp(dst->x / 2.0f, -1.0f, 1.0f);
+      dst->y = MathUtil::Clamp(dst->y / 2.0f, -1.0f, 1.0f);
+    }
+  }
 }
 
 struct LightPointer