From 0ac62e3805e59d4a3e1f8974c9488adc637c71b8 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Mon, 12 Nov 2018 18:28:09 -0500
Subject: [PATCH] Flips and properly sizes output scans.

---
 Outputs/OpenGL/ScanTargetGLSLFragments.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Outputs/OpenGL/ScanTargetGLSLFragments.cpp b/Outputs/OpenGL/ScanTargetGLSLFragments.cpp
index 5a04e525c..cc30f8c1d 100644
--- a/Outputs/OpenGL/ScanTargetGLSLFragments.cpp
+++ b/Outputs/OpenGL/ScanTargetGLSLFragments.cpp
@@ -38,7 +38,8 @@ std::string ScanTarget::globals(ShaderType type) {
 
 				"vec2 centrePoint = mix(startPoint, endPoint, lateral) / scale;"
 				"vec2 height = normalize(endPoint - startPoint).yx * (longitudinal - 0.5) * rowHeight;"
-				"gl_Position = vec4(centrePoint + height, 0.0, 1.0);"
+				"vec2 eyePosition = vec2(1.0) - 2.0 * (centrePoint + height);"
+				"gl_Position = vec4(eyePosition, 0.0, 1.0);"
 			"}";
 
 		case ShaderType::Line: