Alternative black vertical lines fix from jpd002#897

Author: bagelswitch

Source/gs/GSH_OpenGL/GSH_OpenGL.cpp

@@ -653,6 +653,12 @@ 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/GSH_OpenGL/GSH_OpenGL_Shader.cpp

@@ -118,7 +118,7 @@ Framework::OpenGl::CShader CGSH_OpenGL::GenerateVertexShader(const SHADERCAPS& c
 	{
 		shaderBuilder << "	v_fog = a_fog;" << std::endl;
 	}
-	shaderBuilder << "	gl_Position = g_projMatrix * vec4(a_position.x + 0.5, a_position.y + 0.5, 0, 1);" << std::endl;
+	shaderBuilder << "	gl_Position = g_projMatrix * vec4(a_position.x + 0.0, a_position.y + 0.0, 0, 1);" << std::endl;
 
 	shaderBuilder << "}" << std::endl;
 

Source/gs/GSHandler.cpp

@@ -755,6 +755,9 @@ 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:
 	{