Fix warnings with USE_OPENGL=0

source/build/src/engine.cpp

@@ -13204,6 +13204,9 @@ void renderPrepareMirror(int32_t dax, int32_t day, int32_t daz, fix16_t daang, f
 #ifdef USE_OPENGL
     if (videoGetRenderMode() == REND_POLYMOST)
         polymost_prepareMirror(dax, day, daz, daang, dahoriz, dawall);
+#else
+    UNREFERENCED_PARAMETER(daz);
+    UNREFERENCED_PARAMETER(dahoriz);
 #endif
 }
 

source/build/src/sdlayer.cpp

@@ -559,6 +559,7 @@ int main(int argc, char *argv[])
 
 
 #if SDL_MAJOR_VERSION >= 2
+#ifdef USE_OPENGL
 static int sdlayer_getswapinterval(int const syncMode)
 {
     static int intervals[] = { -1, 0, 1, 0};
@@ -577,6 +578,7 @@ static int sdlayer_checkvsync(int checkSync)
     }
     return checkSync;
 }
+#endif
 
 int32_t videoSetVsync(int32_t newSync)
 {

source/duke3d/src/menus.cpp

@@ -652,7 +652,9 @@ static MenuEntry_t ME_SCREENSETUP_CROSSHAIRSIZE = MAKE_MENUENTRY( s_Scale, &MF_R
 
 static int32_t vpsize;
 static MenuRangeInt32_t MEO_SCREENSETUP_SCREENSIZE = MAKE_MENURANGE( &vpsize, &MF_Redfont, 0, 0, 0, 1, EnforceIntervals );
+#ifdef USE_OPENGL
 static MenuOption_t MEO_SCREENSETUP_SCREENSIZE_TWO = MAKE_MENUOPTION( &MF_Redfont, &MEOS_OffOn, &vpsize );
+#endif
 static MenuEntry_t ME_SCREENSETUP_SCREENSIZE = MAKE_MENUENTRY( "Status bar:", &MF_Redfont, &MEF_BigOptionsRt, &MEO_SCREENSETUP_SCREENSIZE, RangeInt32 );
 static MenuRangeInt32_t MEO_SCREENSETUP_TEXTSIZE = MAKE_MENURANGE( &ud.textscale, &MF_Redfont, 100, 400, 0, 16, 2 );
 static MenuEntry_t ME_SCREENSETUP_TEXTSIZE = MAKE_MENUENTRY( s_Scale, &MF_Redfont, &MEF_BigOptions_Apply, &MEO_SCREENSETUP_TEXTSIZE, RangeInt32 );

source/sw/src/draw.cpp

@@ -470,6 +470,8 @@ DoShadows(tspriteptr_t tsp, int viewz, SWBOOL mirror)
             New->y += ofs.y;
         }
     }
+#else
+    UNREFERENCED_PARAMETER(mirror);
 #endif
 
     // Check for voxel items and use a round generic pic if so