commit 887bc44f9962b9a5d694a86dc6fcc5ff7e48337c
author Nicolas Capens <capn@google.com> Tue Jul 21 01:29:49 2015 -0400
committer Nicolas Capens <capn@google.com> Tue Jul 21 19:44:31 2015 +0000
tree 4283b818903fb8376846d9cb9e4b2bca027c3359
parent 35227c81906abc32a4f16a2694c693cce904dc57

Skip half-pixel shift on pre-transformed coordinates.

Bug 22624951

Change-Id: Ibda5f528212c9a8d503d8d6366cd7a42cd832c89
Reviewed-on: https://swiftshader-review.googlesource.com/3742
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/Shader/VertexRoutine.cpp

diff --git a/src/Shader/VertexRoutine.cpp b/src/Shader/VertexRoutine.cpp
index c88c846..e6806a1 100644
--- a/src/Shader/VertexRoutine.cpp
+++ b/src/Shader/VertexRoutine.cpp
@@ -476,7 +476,7 @@
 			r.o[pos].w = rhw;
 		}
 
-		if(!halfIntegerCoordinates)
+		if(!halfIntegerCoordinates && !state.preTransformed)
 		{
 			r.o[pos].x = r.o[pos].x + *Pointer<Float4>(r.data + OFFSET(DrawData,halfPixelX)) * r.o[pos].w;
 			r.o[pos].y = r.o[pos].y + *Pointer<Float4>(r.data + OFFSET(DrawData,halfPixelY)) * r.o[pos].w;