diff --git a/rpcs3/Emu/RSX/GCM.cpp b/rpcs3/Emu/RSX/GCM.cpp
index 4bef41219c..e463a3208f 100644
--- a/rpcs3/Emu/RSX/GCM.cpp
+++ b/rpcs3/Emu/RSX/GCM.cpp
@@ -762,6 +762,34 @@ rsx::primitive_type rsx::to_primitive_type(u8 in)
 	throw new EXCEPTION("Unknow primitive type %d", in);
 }
 
+enum
+{
+	CELL_GCM_WINDOW_ORIGIN_TOP = 0,
+	CELL_GCM_WINDOW_ORIGIN_BOTTOM = 1,
+	CELL_GCM_WINDOW_PIXEL_CENTER_HALF = 0,
+	CELL_GCM_WINDOW_PIXEL_CENTER_INTEGER = 1,
+};
+
+rsx::window_origin rsx::to_window_origin(u8 in)
+{
+	switch (in)
+	{
+	case CELL_GCM_WINDOW_ORIGIN_TOP: return rsx::window_origin::top;
+	case CELL_GCM_WINDOW_ORIGIN_BOTTOM: return rsx::window_origin::bottom;
+	}
+	throw EXCEPTION("Unknow window origin modifier %x", in);
+}
+
+rsx::window_pixel_center rsx::to_window_pixel_center(u8 in)
+{
+	switch (in)
+	{
+	case CELL_GCM_WINDOW_PIXEL_CENTER_HALF: return rsx::window_pixel_center::half;
+	case CELL_GCM_WINDOW_PIXEL_CENTER_INTEGER: return rsx::window_pixel_center::integer;
+	}
+	throw EXCEPTION("Unknow window pixel center %x", in);
+}
+
 
 enum
 {
@@ -1378,6 +1406,31 @@ namespace
 		return result;
 	}
 
+	std::string origin_mode(u32 origin)
+	{
+		switch (rsx::to_window_origin(origin))
+		{
+		case rsx::window_origin::bottom: return "bottom";
+		case rsx::window_origin::top: return "top";
+		}
+		throw EXCEPTION("Wrong origin mode");
+	}
+
+	std::string pixel_center_mode(u32 in)
+	{
+		switch (rsx::to_window_pixel_center(in))
+		{
+		case rsx::window_pixel_center::half: return "half";
+		case rsx::window_pixel_center::integer: return "integer";
+		}
+		throw EXCEPTION("Wrong origin mode");
+	}
+
+	std::string shader_window(u32 arg)
+	{
+		return "Viewport: height = " + std::to_string(arg & 0xFFF) + " origin = " + origin_mode((arg >> 12) & 0xF) + " pixel center = " + pixel_center_mode((arg >> 16) & 0xF);
+	}
+
 #define OPCODE_RANGE_1(opcode, increment, index, printing_function) \
 	{ (opcode) + (index) * (increment), [](u32 arg) -> std::string { return (printing_function)((index), arg); } },
 
@@ -1476,6 +1529,7 @@ namespace
 		{ NV4097_SET_VERTEX_ATTRIB_OUTPUT_MASK, vertex_output_mask },
 		{ NV4097_SET_SHADER_CONTROL, shader_control },
 		{ NV4097_SET_ANTI_ALIASING_CONTROL, anti_aliasing_control },
+		{ NV4097_SET_SHADER_WINDOW, shader_window },
 		{ NV4097_SET_VERTEX_DATA_ARRAY_FORMAT, [](u32 arg) -> std::string { return "Vertex array 0: " + unpack_vertex_format(arg); } },
 		{ NV4097_SET_VERTEX_DATA_ARRAY_FORMAT + 1, [](u32 arg) -> std::string { return "Vertex array 1: " + unpack_vertex_format(arg); } },
 		{ NV4097_SET_VERTEX_DATA_ARRAY_FORMAT + 2, [](u32 arg) -> std::string { return "Vertex array 2: " + unpack_vertex_format(arg); } },
diff --git a/rpcs3/Emu/RSX/GCM.h b/rpcs3/Emu/RSX/GCM.h
index a11dc54ae1..f9a2b0f80e 100644
--- a/rpcs3/Emu/RSX/GCM.h
+++ b/rpcs3/Emu/RSX/GCM.h
@@ -111,6 +111,22 @@ namespace rsx
 	};
 
 	surface_color_format to_surface_color_format(u8 in);
+
+	enum class window_origin : u8
+	{
+		top,
+		bottom
+	};
+
+	window_origin to_window_origin(u8 in);
+
+	enum class window_pixel_center : u8
+	{
+		half,
+		integer
+	};
+
+	window_pixel_center to_window_pixel_center(u8 in);
 }
 
 enum
@@ -481,12 +497,6 @@ enum
 	CELL_GCM_TRUE = 1,
 	CELL_GCM_FALSE = 0,
 
-	CELL_GCM_WINDOW_ORIGIN_TOP = 0,
-	CELL_GCM_WINDOW_ORIGIN_BOTTOM = 1,
-
-	CELL_GCM_WINDOW_PIXEL_CENTER_HALF = 0,
-	CELL_GCM_WINDOW_PIXEL_CENTER_INTEGER = 1,
-
 	CELL_GCM_USER_CLIP_PLANE_DISABLE = 0,
 	CELL_GCM_USER_CLIP_PLANE_ENABLE_LT = 1,
 	CELL_GCM_USER_CLIP_PLANE_ENABLE_GE = 2,
diff --git a/rpcs3/Emu/RSX/GL/GLGSRender.cpp b/rpcs3/Emu/RSX/GL/GLGSRender.cpp
index 77066df146..6dddb5e455 100644
--- a/rpcs3/Emu/RSX/GL/GLGSRender.cpp
+++ b/rpcs3/Emu/RSX/GL/GLGSRender.cpp
@@ -567,10 +567,10 @@ void GLGSRender::set_viewport()
 
 	u32 shader_window = rsx::method_registers[NV4097_SET_SHADER_WINDOW];
 
-	u8 shader_window_origin = (shader_window >> 12) & 0xf;
+	rsx::window_origin shader_window_origin = rsx::to_window_origin((shader_window >> 12) & 0xf);
 
 	//TODO
-	if (true || shader_window_origin == CELL_GCM_WINDOW_ORIGIN_BOTTOM)
+	if (true || shader_window_origin == rsx::window_origin::bottom)
 	{
 		__glcheck glViewport(viewport_x, viewport_y, viewport_w, viewport_h);
 		__glcheck glScissor(scissor_x, scissor_y, scissor_w, scissor_h);