gsdx: anti-vertical-line hack UserHacks_align_sprite_X

This ack realign sprite to full pixel coordinate

It solves vertical line in ace combat/tekken/colin mac rally

plugins/GSdx/GSRendererHW.cpp

@@ -32,6 +32,7 @@ GSRendererHW::GSRendererHW(GSTextureCache* tc)
 {
 	m_upscale_multiplier = theApp.GetConfig("upscale_multiplier", 1);
 	m_userhacks_skipdraw = !!theApp.GetConfig("UserHacks", 0) ? theApp.GetConfig("UserHacks_SkipDraw", 0) : 0;
+	m_userhacks_align_sprite_X = !!theApp.GetConfig("UserHacks_align_sprite_X", 0);
 	m_userhacks_stretch_sprite = !!theApp.GetConfig("UserHacks_stretch_sprite", 0);
 
 	if(!m_nativeres)
@@ -321,7 +322,26 @@ void GSRendererHW::Draw()
 	context->FRAME.FBMSK = fm;
 	context->ZBUF.ZMSK = zm != 0;
 
-	// Hack to avoid black line in various games.
+	// Hack to avoid vertical black line in various games (ace combat/tekken)
+	if (m_userhacks_align_sprite_X && (m_vt.m_primclass == GS_SPRITE_CLASS)) {
+		size_t count = m_vertex.next;
+		GSVertex* v = &m_vertex.buff[0];
+
+		// Note for performance reason I do the check only once on the first
+		// primitive
+		int win_position = v[1].XYZ.X - context->XYOFFSET.OFX;
+		if (((win_position & 0xF) == 8) && ((v[1].U & 0xF) == 0)) {
+			// Normaly vertex are aligned on full pixels and texture in half
+			// pixels. Let's extend the coverage of an half-pixel to avoid
+			// hole after upscaling
+			for(size_t i = 0; i < count; i += 2) {
+				v[i+1].XYZ.X += 8;
+				v[i+1].U += 8;
+			}
+		}
+	}
+
+	// Hack to avoid black line in various 2D games.
 	if (m_userhacks_stretch_sprite && (m_vt.m_primclass == GS_SPRITE_CLASS)) {
 		size_t count = m_vertex.next;
 		GSVertex* v = &m_vertex.buff[0];

plugins/GSdx/GSRendererHW.h

@@ -37,6 +37,8 @@ private:
 	int m_userhacks_skipdraw;
 	int m_sub_texel_offset;
 
+	bool m_userhacks_align_sprite_X;
+
 	#pragma region hacks
 
 	typedef bool (GSRendererHW::*OI_Ptr)(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t);