delete textures, saner resetGL calling rule?

basegraph.cpp

@@ -654,8 +654,12 @@ void resetGL() {
     delete glfont[i];
     glfont[i] = NULL;
     }
+  if(floor_textures) {
+    delete floor_textures;
+    floor_textures = NULL;
+    }
 #endif
-  buildpolys();
+  resetGeometry(); // includes buildPoly
   }
 
 #endif

graph.cpp

@@ -6479,9 +6479,7 @@ void resetGeometry() {
 #if CAP_FIELD
   if(hyperbolic && &currfp != &fieldpattern::fp_invalid) currfp.analyze();
 #endif
-#if CAP_GL
-  resetGL();
-#endif
+  buildpolys();
   }
 
 //=== animation