+/*
+ * TEXTURING
+ * If enabled, the first element of a scene will be textured with the
+ * raster from texture.ppm or texture.bmp.
+ */
+#if TEXTURING
+#define IF_TEXTURING(X) X
+#else
+#define IF_TEXTURING(X)
+#endif
+
+/*
+ * QUIRKS
+ * If enabled, compatibility quirks particular to the project assignment
+ * will be turned on, causing the output to match more closely with the
+ * provided examples.
+ */
+#if QUIRKS
+#define IF_QUIRKS(X) X
+#else
+#define IF_QUIRKS(X)
+#endif
+