- cleaned up the video scale mode code a bit, in order to increase future flexibility.

src/r_videoscale.cpp

@@ -0,0 +1,77 @@
+// 
+//---------------------------------------------------------------------------
+//
+// Copyright(C) 2017 Magnus Norddahl
+// Copyright(C) 2017 Rachael Alexanderson
+// All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see http://www.gnu.org/licenses/
+//
+//--------------------------------------------------------------------------
+//
+
+#include "c_dispatch.h"
+#include "c_cvars.h"
+
+CUSTOM_CVAR (Int, vid_scalemode, 0, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
+{
+	if (self < 0 || self > 5)
+	{
+		self = 0;
+	}
+}
+
+bool ViewportLinearScale()
+{
+	return vid_scalemode == 4 || vid_scalemode == 5;
+}
+
+int ViewportScaledWidth(int width)
+{
+	switch (vid_scalemode)
+	{
+	default:
+	case 0: return width;
+	case 1: return 320;
+	case 2: return 640;
+	case 3: return (int)roundf(width * 0.5f);
+	case 4: return (int)roundf(width * 0.75f);
+	case 5: return width * 2;
+	}
+}
+
+int ViewportScaledHeight(int height)
+{
+	switch (vid_scalemode)
+	{
+	default:
+	case 0: return height;
+	case 1: return 200;
+	case 2: return 400;
+	case 3: return (int)roundf(height * 0.5f);
+	case 4: return (int)roundf(height * 0.75f);
+	case 5: return height * 2;
+	}
+}
+
+bool ViewportIsScaled43()
+{
+	switch (vid_scalemode)
+	{
+	default: return false;
+	case 1:
+	case 2: return true;
+	}
+}
+