Alternative black vertical lines fix from jpd002#897

Author: bagelswitch

Source/gs/GSH_OpenGL/GSH_OpenGL.cpp

@@ -674,6 +674,12 @@ void CGSH_OpenGL::SetRenderingContext(uint64 primReg)
 	m_nPrimOfsX = offset.GetX();
 	m_nPrimOfsY = offset.GetY();
 
+	// Account for the fact that PS2 assumes the pixel center at the bottom left,
+	// but OpenGL at the center of the screen. On even resolutions this causes a slight
+	// discrepancy.
+	m_nPrimOfsX -= 0.5f;
+	m_nPrimOfsY -= 0.5f;
+
 	CHECKGLERROR();
 
 	m_renderState.isValid = true;

Source/gs/GSHandler.cpp

@@ -756,6 +756,9 @@ void CGSHandler::WriteRegisterImpl(uint8 nRegister, uint64 nData)
 
 	switch(nRegister)
 	{
+	case GS_REG_ST:
+		m_nReg[nRegister] &= 0xFFFFFF00FFFFFF00;
+		break;
 	case GS_REG_TEX0_1:
 	case GS_REG_TEX0_2:
 	{