Merge commit '0132cbcf33a3ae568c361751a42ff53c41e08f68' as 'external/pure_doom/PureDOOM'

external/pure_doom/PureDOOM/src/DOOM/r_sky.c

@@ -0,0 +1,51 @@
+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// $Id:$
+//
+// Copyright (C) 1993-1996 by id Software, Inc.
+//
+// This source is available for distribution and/or modification
+// only under the terms of the DOOM Source Code License as
+// published by id Software. All rights reserved.
+//
+// The source is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
+// for more details.
+//
+// $Log:$
+//
+// DESCRIPTION:
+//  Sky rendering. The DOOM sky is a texture map like any
+//  wall, wrapping around. A 1024 columns equal 360 degrees.
+//  The default sky map is 256 columns and repeats 4 times
+//  on a 320 screen?
+//  
+//
+//-----------------------------------------------------------------------------
+
+
+#include "doom_config.h"
+
+#include "m_fixed.h" // Needed for FRACUNIT.
+#include "r_data.h" // Needed for Flat retrieval.
+#include "r_sky.h"
+
+
+//
+// sky mapping
+//
+int skyflatnum;
+int skytexture;
+int skytexturemid;
+
+
+//
+// R_InitSkyMap
+// Called whenever the view size changes.
+//
+void R_InitSkyMap(void)
+{
+    skytexturemid = 100 * FRACUNIT;
+}