More fog/visibility tweaking. This makes Polymost's not depend on the screen width.

git-svn-id: https://svn.eduke32.com/eduke32@1944 1a8010ca-5511-0410-912e-c29ae57300e0

polymer/eduke32/build/include/polymost.h

@@ -121,8 +121,7 @@ extern double gyxscale, gxyaspect, gviewxrange, ghalfx, grhalfxdown10, grhalfxdo
 extern double gcosang, gsinang, gcosang2, gsinang2;
 extern double gchang, gshang, gctang, gstang, gvisibility;
 
-//#define FOGSCALE 0.0000768
-#define FOGSCALE ((0.0000768+0.0000128)/(1 + 0.5f*(getrendermode()==4)))
+#define FOGSCALE 0.0000768
 
 extern float fogresult, fogcol[4], fogtable[4*MAXPALOOKUPS];
 

polymer/eduke32/build/src/engine.c

@@ -7755,7 +7755,27 @@ void drawrooms(int32_t daposx, int32_t daposy, int32_t daposz,
 
     i = mulscale16(xdimenscale,viewingrangerecip);
     globalpisibility = mulscale16(parallaxvisibility,i);
-    globalvisibility = getrendermode()==0 ? mulscale16(visibility,i) : scale(visibility<<2,4,3);
+    switch (getrendermode())
+    {
+        // switch on renderers to make fog look almost the same everywhere
+
+    case 0:
+        globalvisibility = mulscale16(visibility,i);
+        break;
+#ifdef USE_OPENGL
+    case 3:
+        // I have no idea what the significance of this constant is,
+        // it was found out experimentally.             v  v
+        globalvisibility = scale(visibility<<2, xdimen, 1100);
+        break;
+# ifdef POLYMER
+    case 4:
+        globalvisibility = visibility<<2;
+        break;
+# endif
+#endif
+    }
+
     globalhisibility = mulscale16(globalvisibility,xyaspect);
     globalcisibility = mulscale8(globalhisibility,320);