From 454db9d5d30a2688f355716507bf5bc43240b8f2 Mon Sep 17 00:00:00 2001
From: ImJezze <jezze@gmx.net>
Date: Sat, 16 Apr 2016 15:46:04 +0200
Subject: [PATCH] Fixed texture coordinates for vector screen quad (nw)

---
 src/emu/render.cpp | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/src/emu/render.cpp b/src/emu/render.cpp
index b2e4e02558a..6f42d26c3c7 100644
--- a/src/emu/render.cpp
+++ b/src/emu/render.cpp
@@ -1890,8 +1890,39 @@ void render_target::add_container_primitives(render_primitive_list &list, const
 
 					if (PRIMFLAG_GET_VECTORBUF(curitem.flags()))
 					{
+						// flags S swap-xy, Y flip-y, X flip-x
+						//
+						// S  Y  X   e.g.       flips
+						// 0  0  0   asteroid   !X !Y
+						// 0  0  1   -
+						// 0  1  0   speedfrk   !X  Y
+						// 0  1  1   solarq      X  Y
+						// 1  0  0   -
+						// 1  0  1   -
+						// 1  1  0   tempest    !X  Y
+						// 1  1  1   barrier    !X !Y
+
+						bool flip_x = (manager().machine().system().flags & ORIENTATION_FLIP_X) == ORIENTATION_FLIP_X;
+						bool flip_y = (manager().machine().system().flags & ORIENTATION_FLIP_Y) == ORIENTATION_FLIP_Y;
+						bool swap_xy = (manager().machine().system().flags & ORIENTATION_SWAP_XY) == ORIENTATION_SWAP_XY;
+
+						int vectororient = 0;
+						if (flip_x)
+						{
+							vectororient |= ORIENTATION_FLIP_X;
+						}
+						if (flip_y)
+						{
+							vectororient |= ORIENTATION_FLIP_Y;
+						}
+						if (flip_x && flip_y && swap_xy)
+						{
+							vectororient ^= ORIENTATION_FLIP_Y;
+							vectororient ^= ORIENTATION_FLIP_X;
+						}
+
 						// determine the final orientation (textures are up-side down, so flip y-axis for vectors to immitate that behavior)
-						int finalorient = orientation_add(ORIENTATION_FLIP_Y, container_xform.orientation);
+						int finalorient = orientation_add(vectororient, container_xform.orientation);
 
 						// determine UV coordinates
 						prim->texcoords = oriented_texcoords[finalorient];