6.09HEADmaster

1 files changed, 0 insertions, 1954 deletions

diff --git a/hacks/glx/maze3d.c b/hacks/glx/maze3d.c
deleted file mode 100755
index d3d34fb..0000000
--- a/hacks/glx/maze3d.c
+++ /dev/null
@@ -1,1954 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*- */
-/* maze3d --- A recreation of the old 3D maze screensaver from Windows 95.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted,
- * provided that the above copyright notice appear in all copies and that
- * both that copyright notice and this permission notice appear in
- * supporting documentation.
- *
- * This file is provided AS IS with no warranties of any kind.  The author
- * shall have no liability with respect to the infringement of copyrights,
- * trade secrets or any patents by this file or any part thereof.  In no
- * event will the author be liable for any lost revenue or profits or
- * other special, indirect and consequential damages.
- *
- * Revision History:
- *
- * 03-Apr-2018: Released initial version of "3D Maze"
- * (sudoer@riseup.net)
- */
-
-#undef USE_FLOATING_IMAGES
-#undef USE_FRACTAL_IMAGES
-
-#ifdef STANDALONE
-#define DEFAULTS	"*delay:			20000   \n"	\
-					"*showFPS:			False	\n" \
-
-#define release_maze 0
-# include "xlockmore.h"				/* from the xscreensaver distribution */
-#else  /* !STANDALONE */
-# include "xlock.h"					/* from the xlockmore distribution */
-#endif /* !STANDALONE */
-#include <math.h>
-
-#ifdef USE_GL /* whole file */
-
-#define DEF_ANGULAR_CONVERSION_FACTOR 90
-#define DEF_SPEED "1.0"
-#define DEF_NUM_ROWS "12"
-#define DEF_NUM_COLUMNS "12"
-#define DEF_NUM_RATS "1"
-#define DEF_NUM_INVERTERS "10"
-#define DEF_SHOW_OVERLAY "False"
-#define DEF_DROP_ACID "False"
-
-#include "../images/gen/brick1_png.h"
-#include "../images/gen/brick2_png.h"
-#include "../images/gen/wood2_png.h"
-#include "../images/gen/start_png.h"
-#include "../images/gen/bob_png.h"
-#include "../images/gen/logo-32_png.h"
-
-#ifdef USE_FLOATING_IMAGES
-# include "../images/gen/opengltxt_png.h"
-# include "../images/gen/openglbook_png.h"
-#endif
-#ifdef USE_FRACTAL_IMAGES
-# include "../images/gen/fractal1_png.h"
-# include "../images/gen/fractal2_png.h"
-# include "../images/gen/fractal3_png.h"
-# include "../images/gen/fractal4_png.h"
-#endif
-
-#include "ximage-loader.h"
-
-static int dropAcid, dropAcidWalls, dropAcidCeiling, dropAcidFloor, numInverters, numRats;
-#ifdef USE_FLOATING_IMAGES
-static int numGl3dTexts, numGlRedbooks;
-#endif
-static int shouldDrawOverlay, numRows, numColumns;
-static char *wallTexture, *floorTexture, *ceilingTexture;
-static GLfloat speed;
-
-static XrmOptionDescRec opts[] = {
-	{"-drop-acid", ".maze3d.dropAcid", XrmoptionNoArg, "true"},
-	{"-drop-acid-walls", ".maze3d.dropAcidWalls", XrmoptionNoArg, "true"},
-	{"-drop-acid-floor", ".maze3d.dropAcidFloor", XrmoptionNoArg, "true"},
-	{"-drop-acid-ceiling", ".maze3d.dropAcidCeiling", XrmoptionNoArg, "true"},
-	{"-wall-texture", ".maze3d.wallTexture", XrmoptionSepArg, 0},
-	{"-floor-texture", ".maze3d.floorTexture", XrmoptionSepArg, 0},
-	{"-ceiling-texture", ".maze3d.ceilingTexture", XrmoptionSepArg, 0},
-	{"-rows", ".maze3d.numRows", XrmoptionSepArg, 0},
-	{"-columns", ".maze3d.numColumns", XrmoptionSepArg, 0},
-	{"-inverters", ".maze3d.numInverters", XrmoptionSepArg, 0},
-	{"-rats", ".maze3d.numRats", XrmoptionSepArg, 0},
-# ifdef USE_FLOATING_IMAGES
-	{"-gl-3d-texts", ".maze3d.numGl3dTexts", XrmoptionSepArg, 0},
-	{"-gl-redbooks", ".maze3d.numGlRedbooks", XrmoptionSepArg, 0},
-# endif
-	{"-overlay", ".maze3d.showOverlay", XrmoptionNoArg, "true"},
-	{"-speed", ".maze3d.speed", XrmoptionSepArg, 0},
-};
-
-static argtype vars[] = {
-	{&dropAcid, "dropAcid", "Drop Acid", DEF_DROP_ACID, t_Bool},
-	{&dropAcidWalls, "dropAcidWalls", "Drop Acid Walls", "False", t_Bool},
-	{&dropAcidFloor, "dropAcidFloor", "Drop Acid Floor", "False", t_Bool},
-	{&dropAcidCeiling, "dropAcidCeiling", "Drop Acid Ceiling", "False", t_Bool},
-	{&wallTexture, "wallTexture", "Wall Texture", "brick-wall", t_String},
-	{&floorTexture, "floorTexture", "Floor Texture", "wood-floor", t_String},
-	{&ceilingTexture, "ceilingTexture", "Ceiling Texture", "ceiling-tiles",
-		t_String},
-	{&numRows, "numRows", "Number of Rows", DEF_NUM_ROWS, t_Int},
-	{&numColumns, "numColumns", "Number of Columns", DEF_NUM_COLUMNS, t_Int},
-	{&numInverters, "numInverters", "Number of Inverters", DEF_NUM_INVERTERS, t_Int},
-	{&numRats, "numRats", "Number of Rats", DEF_NUM_RATS, t_Int},
-# ifdef USE_FLOATING_IMAGES
-	{&numGl3dTexts, "numGl3dTexts", "Number of GL 3D Texts", "3", t_Int},
-	{&numGlRedbooks, "numGlRedbooks", "Number of GL Redbooks", "3", t_Int},
-# endif
-	{&shouldDrawOverlay, "showOverlay", "Show Overlay", DEF_SHOW_OVERLAY, t_Bool},
-	{&speed, "speed", "speed", DEF_SPEED, t_Float},
-};
-
-ENTRYPOINT ModeSpecOpt maze_opts = {countof(opts), opts, countof(vars), vars, NULL};
-
-enum cellTypes
-{
-	WALL, CELL_UNVISITED, CELL, START, FINISH, GL_3D_TEXT, INVERTER_TETRAHEDRON,
-	INVERTER_OCTAHEDRON, INVERTER_DODECAHEDRON, INVERTER_ICOSAHEDRON,
-	WALL_GL_REDBOOK
-};
-
-enum programStates
-{
-	STARTING, WALKING, TURNING_LEFT, TURNING_RIGHT, TURNING_AROUND, INVERTING,
-	FINISHING
-};
-
-enum overlayLists
-{
-	ARROW = 15, SQUARE, STAR, TRIANGLE
-};
-
-enum directions
-{
-	NORTH = 0, EAST = 90, SOUTH = 180, WEST = 270
-};
-
-typedef struct
-{
-	unsigned row, column;
-} Tuple;
-
-typedef struct
-{
-	GLfloat x, z;
-} Tuplef;
-
-typedef struct
-{
-	GLfloat red, green, blue;
-} Color;
-
-typedef struct
-{
-	Tuplef position;
-	GLfloat rotation, desiredRotation, inversion, remainingDistanceToTravel;
-	unsigned char state, isCamera;
-} Rat;
-
-
-/* structure for holding the maze data */
-typedef struct
-{
-	GLXContext *glx_context;
-
-	unsigned char **mazeGrid;
-	Tuple *wallList;
-	unsigned wallListSize;
-	Tuple startPosition, finishPosition, *inverterPosition,
-	*gl3dTextPosition;
-    GLuint  wallTexture, floorTexture, ceilingTexture, startTexture,
-      finishTexture, ratTexture;
-	Rat camera;
-	Rat *rats;
-# ifdef USE_FLOATING_IMAGES
-	GLuint gl3dTextTexture, glTextbookTexture;
-# endif
-# ifdef USE_FRACTAL_IMAGES
-	GLuint fractal1Texture, fractal2Texture, fractal3Texture, fractal4Texture;
-# endif
-	Color acidColor;
-	float acidHue;
-	GLfloat wallHeight, inverterRotation;
-    Bool button_down_p;
-    int numRows, numColumns, numGlRedbooks;
-    GLuint dlists[30];  /* ARROW etc index into this */
-
-} maze_configuration;
-
-static maze_configuration *mazes = NULL;
-
-static void newMaze(maze_configuration* maze);
-static void constructLists(ModeInfo *);
-static void initializeGrid(maze_configuration* maze);
-static float roundToNearestHalf(float num);
-static unsigned isOdd(unsigned num);
-static unsigned isEven(unsigned num);
-static void buildMaze(maze_configuration* maze);
-static void addWallsToList(Tuple cell, maze_configuration* maze);
-static unsigned char isRemovableWall(Tuple coordinates,
-		maze_configuration* maze);
-static void addCells(Tuple cellToAdd, Tuple currentWall,
-		maze_configuration* maze);
-static void removeWallFromList(unsigned index, maze_configuration* maze);
-static void placeMiscObjects(maze_configuration* maze);
-static Tuple placeObject(maze_configuration* maze, unsigned char type);
-static void shiftAcidColor(maze_configuration* maze);
-static void refreshRemainingDistanceToTravel(ModeInfo * mi);
-static void step(Rat* rat, maze_configuration* maze);
-static void walk(Rat* rat, char axis, int sign, maze_configuration* maze);
-static void turn(Rat* rat, maze_configuration* maze);
-static void turnAround(Rat* rat, maze_configuration* maze);
-static void invert(maze_configuration* maze);
-static void changeState(Rat* rat, maze_configuration* maze);
-static void updateInverterRotation(maze_configuration* maze);
-static void drawInverter(maze_configuration* maze, Tuple coordinates);
-static void drawWalls(ModeInfo * mi);
-static void drawWall(Tuple startCoordinates, Tuple endCoordinates,
-		maze_configuration* maze);
-static void drawCeiling(ModeInfo * mi);
-static void drawFloor(ModeInfo * mi);
-static void drawPane(ModeInfo *, GLuint texture, Tuple position);
-static void drawRat(Tuplef position, maze_configuration* maze);
-static void drawOverlay(ModeInfo *);
-
-/* Set up and enable texturing on our object */
-static void
-setup_png_texture (ModeInfo *mi, const unsigned char *png_data,
-                   unsigned long data_size)
-{
-    XImage *image = image_data_to_ximage (MI_DISPLAY (mi), MI_VISUAL (mi),
-                                          png_data, data_size);
-	char buf[1024];
-	clear_gl_error();
-	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-	/* iOS invalid enum:
-	glPixelStorei(GL_UNPACK_ROW_LENGTH, image->width);
-	*/
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
-				 image->width, image->height, 0,
-				 GL_RGBA,
-				 /* GL_UNSIGNED_BYTE, */
-				 GL_UNSIGNED_INT_8_8_8_8_REV,
-				 image->data);
-	sprintf (buf, "builtin texture (%dx%d)", image->width, image->height);
-			 check_gl_error(buf);
-}
-
-
-static Bool
-setup_file_texture (ModeInfo *mi, char *filename)
-{
-	Display *dpy = mi->dpy;
-	Visual *visual = mi->xgwa.visual;
-	char buf[1024];
-
-	XImage *image = file_to_ximage (dpy, visual, filename);
-	if (!image) return False;
-
-	clear_gl_error();
-	glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
-	glPixelStorei(GL_UNPACK_ROW_LENGTH, image->width);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
-				 image->width, image->height, 0,
-				 GL_RGBA,
-				 GL_UNSIGNED_BYTE, image->data);
-	sprintf (buf, "texture: %.100s (%dx%d)",
-			 filename, image->width, image->height);
-	check_gl_error(buf);
-	return True;
-}
-
-static void
-setup_textures(ModeInfo * mi)
-{
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-    GLint mag = GL_NEAREST;  /* GL_LINEAR */
-
-	glGenTextures(1, &maze->finishTexture);
-	glBindTexture(GL_TEXTURE_2D, maze->finishTexture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, logo_32_png, sizeof(logo_32_png));
-
-	glGenTextures(1, &maze->ratTexture);
-	glBindTexture(GL_TEXTURE_2D, maze->ratTexture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, bob_png, sizeof(bob_png));
-
-# ifdef USE_FLOATING_IMAGES
-	glGenTextures(1, &maze->glTextbookTexture);
-	glBindTexture(GL_TEXTURE_2D, maze->glTextbookTexture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, openglbook_png, sizeof(openglbook_png));
-
-	glGenTextures(1, &maze->gl3dTextTexture);
-	glBindTexture(GL_TEXTURE_2D, maze->gl3dTextTexture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, opengltxt_png, sizeof(opengltxt_png));
-# endif
-
-# ifdef USE_FRACTAL_IMAGES
-	glGenTextures(1, &maze->fractal1Texture);
-	glBindTexture(GL_TEXTURE_2D, maze->fractal1Texture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, fractal1_png, sizeof(fractal1_png));
-
-	glGenTextures(1, &maze->fractal2Texture);
-	glBindTexture(GL_TEXTURE_2D, maze->fractal2Texture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, fractal2_png, sizeof(fractal2_png));
-
-	glGenTextures(1, &maze->fractal3Texture);
-	glBindTexture(GL_TEXTURE_2D, maze->fractal3Texture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, fractal3_png, sizeof(fractal3_png));
-
-	glGenTextures(1, &maze->fractal4Texture);
-	glBindTexture(GL_TEXTURE_2D, maze->fractal4Texture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, fractal4_png, sizeof(fractal4_png));
-# endif
-
-	glGenTextures(1, &maze->startTexture);
-	glBindTexture(GL_TEXTURE_2D, maze->startTexture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	setup_png_texture(mi, start_png, sizeof(start_png));
-
-	glGenTextures(1, &maze->ceilingTexture);
-	glBindTexture(GL_TEXTURE_2D, maze->ceilingTexture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	if (!ceilingTexture || !*ceilingTexture
-			|| !strcmp(ceilingTexture, "ceiling-tiles")) {
-		DEFAULT_CEILING_TEXTURE:
-		setup_png_texture(mi, brick2_png, sizeof(brick2_png));
-	} else if (!strcmp(ceilingTexture, "brick-wall")) {
-		setup_png_texture(mi, brick1_png, sizeof(brick1_png));
-	} else if (!strcmp(ceilingTexture, "wood-floor")) {
-		setup_png_texture(mi, wood2_png, sizeof(wood2_png));
-# ifdef USE_FRACTAL_IMAGES
-	} else if (!strcmp(ceilingTexture, "fractal-1")) {
-		setup_png_texture(mi, fractal1_png, sizeof(fractal1_png));
-		dropAcidCeiling = 1;
-	} else if (!strcmp(ceilingTexture, "fractal-2")) {
-		setup_png_texture(mi, fractal2_png, sizeof(fractal2_png));
-		dropAcidCeiling = 1;
-	} else if (!strcmp(ceilingTexture, "fractal-3")) {
-		setup_png_texture(mi, fractal3_png, sizeof(fractal3_png));
-		dropAcidCeiling = 1;
-	} else if (!strcmp(ceilingTexture, "fractal-4")) {
-		setup_png_texture(mi, fractal4_png, sizeof(fractal4_png));
-		dropAcidCeiling = 1;
-# endif
-	} else {
-		if (!setup_file_texture(mi, ceilingTexture))
-			goto DEFAULT_CEILING_TEXTURE;
-	}
-
-	glGenTextures(1, &maze->floorTexture);
-	glBindTexture(GL_TEXTURE_2D, maze->floorTexture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	if (!floorTexture || !*floorTexture
-			|| !strcmp(floorTexture, "wood-floor")) {
-		DEFAULT_FLOOR_TEXTURE:
-		setup_png_texture(mi, wood2_png, sizeof(wood2_png));
-	} else if (!strcmp(floorTexture, "ceiling-tiles")) {
-		setup_png_texture(mi, brick2_png, sizeof(brick2_png));
-	} else if (!strcmp(floorTexture, "brick-wall")) {
-		setup_png_texture(mi, brick1_png, sizeof(brick1_png));
-# ifdef USE_FRACTAL_IMAGES
-	} else if (!strcmp(floorTexture, "fractal-1")) {
-		setup_png_texture(mi, fractal1_png, sizeof(fractal1_png));
-		dropAcidFloor = 1;
-	} else if (!strcmp(floorTexture, "fractal-2")) {
-		setup_png_texture(mi, fractal2_png, sizeof(fractal2_png));
-		dropAcidFloor = 1;
-	} else if (!strcmp(floorTexture, "fractal-3")) {
-		setup_png_texture(mi, fractal3_png, sizeof(fractal3_png));
-		dropAcidFloor = 1;
-	} else if (!strcmp(floorTexture, "fractal-4")) {
-		setup_png_texture(mi, fractal4_png, sizeof(fractal4_png));
-		dropAcidFloor = 1;
-# endif
-	} else {
-		if (!setup_file_texture(mi, floorTexture))
-			goto DEFAULT_FLOOR_TEXTURE;
-	}
-
-	glGenTextures(1, &maze->wallTexture);
-	glBindTexture(GL_TEXTURE_2D, maze->wallTexture);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mag);
-	if (!wallTexture || !*wallTexture || !strcmp(wallTexture, "brick-wall")) {
-		DEFAULT_WALL_TEXTURE:
-		setup_png_texture(mi, brick1_png, sizeof(brick1_png));
-	} else if (!strcmp(wallTexture, "ceiling-tiles")) {
-		setup_png_texture(mi, brick2_png, sizeof(brick2_png));
-	} else if (!strcmp(wallTexture, "wood-floor")) {
-		setup_png_texture(mi, wood2_png, sizeof(wood2_png));
-# ifdef USE_FRACTAL_IMAGES
-	} else if (!strcmp(wallTexture, "fractal-1")) {
-		setup_png_texture(mi, fractal1_png, sizeof(fractal1_png));
-		dropAcidWalls = 1;
-	} else if (!strcmp(wallTexture, "fractal-2")) {
-		setup_png_texture(mi, fractal2_png, sizeof(fractal2_png));
-		dropAcidWalls = 1;
-	} else if (!strcmp(wallTexture, "fractal-3")) {
-		setup_png_texture(mi, fractal3_png, sizeof(fractal3_png));
-		dropAcidWalls = 1;
-	} else if (!strcmp(wallTexture, "fractal-4")) {
-		setup_png_texture(mi, fractal4_png, sizeof(fractal4_png));
-		dropAcidWalls = 1;
-# endif
-	} else {
-		if (!setup_file_texture(mi, wallTexture))
-			goto DEFAULT_WALL_TEXTURE;
-	}
-}
-
-static void
-initializeGrid(maze_configuration* maze)
-{
-	unsigned i, j;
-
-	for (i = 0; i < maze->numRows; i++) {
-		for (j = 0; j < maze->numColumns; j++) {
-			if (isOdd(i) && isOdd(j))
-				maze->mazeGrid[i][j] = CELL_UNVISITED;
-			else
-				maze->mazeGrid[i][j] = WALL;
-		}
-	}
-}
-
-static float
-roundToNearestHalf(float num)
-{
-	return roundf(2.0 * num) / 2.0;
-}
-
-static unsigned
-isOdd(unsigned num)
-{
-	return num % 2;
-}
-
-static unsigned
-isEven(unsigned num)
-{
-	return !isOdd(num);
-}
-
-/*This is the randomized Prim's algorithm.*/
-static void
-buildMaze(maze_configuration* maze)
-{
-	Tuple cellToAdd, firstCell = {1, 1};
-	maze->mazeGrid[1][1] = CELL;
-
-	addWallsToList(firstCell, maze);
-
-	while (maze->wallListSize > 0) {
-		unsigned randomNum = random() % maze->wallListSize;
-		Tuple currentWall = maze->wallList[randomNum];
-
-		if (isEven(currentWall.row)) {
-			if (maze->mazeGrid[currentWall.row - 1][currentWall.column]
-				== CELL
-				&& maze->mazeGrid[currentWall.row + 1][currentWall.column]
-				== CELL_UNVISITED
-			) {
-				cellToAdd.row = currentWall.row + 1;
-				cellToAdd.column = currentWall.column;
-				addCells(cellToAdd, currentWall, maze);
-			}
-			else if (maze->mazeGrid[currentWall.row + 1][currentWall.column]
-				== CELL
-				&& maze->mazeGrid[currentWall.row - 1][currentWall.column]
-				== CELL_UNVISITED
-			) {
-				cellToAdd.row = currentWall.row - 1;
-				cellToAdd.column = currentWall.column;
-				addCells(cellToAdd, currentWall, maze);
-			}
-		} else {
-			if (maze->mazeGrid[currentWall.row][currentWall.column - 1]
-				== CELL
-				&& maze->mazeGrid[currentWall.row][currentWall.column + 1]
-				== CELL_UNVISITED
-			) {
-				cellToAdd.row = currentWall.row;
-				cellToAdd.column = currentWall.column + 1;
-				addCells(cellToAdd, currentWall, maze);
-			}
-			else if (maze->mazeGrid[currentWall.row][currentWall.column + 1]
-				== CELL
-				&& maze->mazeGrid[currentWall.row][currentWall.column - 1]
-				== CELL_UNVISITED
-			) {
-				cellToAdd.row = currentWall.row;
-				cellToAdd.column = currentWall.column - 1;
-				addCells(cellToAdd, currentWall, maze);
-			}
-		}
-
-		removeWallFromList(randomNum, maze);
-	}
-}
-
-static void
-addWallsToList(Tuple cell, maze_configuration* maze)
-{
-	unsigned i;
-	Tuple walls[4];
-	walls[0].row = cell.row - 1;
-	walls[0].column = cell.column;
-	walls[1].row = cell.row + 1;
-	walls[1].column = cell.column;
-	walls[2].row = cell.row;
-	walls[2].column = cell.column - 1;
-	walls[3].row = cell.row;
-	walls[3].column = cell.column + 1;
-
-	for (i = 0; i < 4; i++) {
-		if (isRemovableWall(walls[i], maze)) {
-			maze->wallList[maze->wallListSize] = walls[i];
-			maze->wallListSize++;
-		}
-	}
-}
-
-static unsigned char
-isRemovableWall(Tuple coordinates, maze_configuration* maze)
-{
-	if (maze->mazeGrid[coordinates.row][coordinates.column] == WALL
-		&& coordinates.row > 0
-		&& coordinates.row < maze->numRows - 1
-		&& coordinates.column > 0
-		&& coordinates.column < maze->numColumns - 1
-	)
-		return 1;
-	else
-		return 0;
-}
-
-static void
-addCells(Tuple cellToAdd, Tuple currentWall, maze_configuration* maze)
-{
-	maze->mazeGrid[currentWall.row][currentWall.column] = CELL;
-	maze->mazeGrid[cellToAdd.row][cellToAdd.column] = CELL;
-	addWallsToList(cellToAdd, maze);
-}
-
-static void
-removeWallFromList(unsigned index, maze_configuration* maze)
-{
-	unsigned i;
-	for (i = index + 1; i < maze->wallListSize; i++)
-		maze->wallList[i - 1] = maze->wallList[i];
-
-	maze->wallListSize--;
-}
-
-static void
-placeMiscObjects(maze_configuration* maze)
-{
-	Rat* rat;
-	Tuple temp;
-	unsigned char object;
-    unsigned numSurroundingWalls = 3;
-	unsigned i;
-
-	while (numSurroundingWalls >= 3) {
-		numSurroundingWalls = 0;
-		maze->startPosition = placeObject(maze, CELL);
-
-		object = maze->mazeGrid[maze->startPosition.row]
-			[maze->startPosition.column + 1];
-		if (object == WALL || object == WALL_GL_REDBOOK)
-			numSurroundingWalls++;
-		object = maze->mazeGrid[maze->startPosition.row - 1]
-			[maze->startPosition.column];
-		if (object == WALL || object == WALL_GL_REDBOOK)
-			numSurroundingWalls++;
-		object = maze->mazeGrid[maze->startPosition.row]
-			[maze->startPosition.column - 1];
-		if (object == WALL || object == WALL_GL_REDBOOK)
-			numSurroundingWalls++;
-		object = maze->mazeGrid[maze->startPosition.row + 1]
-			[maze->startPosition.column];
-		if (object == WALL || object == WALL_GL_REDBOOK)
-			numSurroundingWalls++;
-	}
-	maze->mazeGrid[maze->startPosition.row][maze->startPosition.column] = START;
-
-	if (maze->mazeGrid[maze->startPosition.row][maze->startPosition.column + 1]
-			!= WALL && maze->mazeGrid[maze->startPosition.row]
-			[maze->startPosition.column + 1] != WALL_GL_REDBOOK) {
-		maze->camera.position.x = (maze->startPosition.column + 1) / 2.0;
-		maze->camera.position.z = maze->startPosition.row / 2.0;
-		maze->camera.rotation = WEST;
-	}
-	else if (maze->mazeGrid[maze->startPosition.row - 1]
-			[maze->startPosition.column] != WALL
-			&& maze->mazeGrid[maze->startPosition.row - 1]
-			[maze->startPosition.column] != WALL_GL_REDBOOK) {
-		maze->camera.position.x = maze->startPosition.column / 2.0;
-		maze->camera.position.z = (maze->startPosition.row - 1) / 2.0;
-		maze->camera.rotation = SOUTH;
-	}
-	else if (maze->mazeGrid[maze->startPosition.row]
-			[maze->startPosition.column - 1] != WALL
-			&& maze->mazeGrid[maze->startPosition.row]
-			[maze->startPosition.column - 1] != WALL_GL_REDBOOK) {
-		maze->camera.position.x = (maze->startPosition.column - 1) / 2.0;
-		maze->camera.position.z = maze->startPosition.row / 2.0;
-		maze->camera.rotation = EAST;
-	}
-	else {
-		maze->camera.position.x = maze->startPosition.column / 2.0;
-		maze->camera.position.z = (maze->startPosition.row + 1) / 2.0;
-		maze->camera.rotation = NORTH;
-	}
-
-	maze->finishPosition = placeObject(maze, FINISH);
-
-	for (i = 0; i < numInverters; i++)
-		maze->inverterPosition[i] =
-			placeObject(maze, random() % 4 + INVERTER_TETRAHEDRON);
-
-	temp.row = 0;
-	temp.column = 0;
-
-# ifdef USE_FLOATING_IMAGES
-	for (i = 0; i < numGl3dTexts; i++)
-		maze->gl3dTextPosition[i] =
-			placeObject(maze, GL_3D_TEXT);
-# endif
-
-	for (i = 0; i < numRats; i++) {
-		rat = &(maze->rats[i]);
-		temp = placeObject(maze, CELL);
-		rat->position.x = temp.column / 2.0;
-		rat->position.z = temp.row / 2.0;
-		rat->state = WALKING;
-
-		if (temp.row == 0 && temp.column == 0) {
-			continue;
-		}
-
-		if (maze->mazeGrid[(int)(rat->position.z * 2)]
-				[(int)(rat->position.x * 2) + 1]
-				!= WALL && maze->mazeGrid[(int)(rat->position.z * 2)]
-				[(int)(rat->position.x * 2) + 1] != WALL_GL_REDBOOK)
-			rat->rotation = EAST;
-		else if (maze->mazeGrid[(int)(rat->position.z * 2) - 1]
-				[(int)(rat->position.x * 2)]
-				!= WALL && maze->mazeGrid[(int)(rat->position.z * 2) - 1]
-				[(int)(rat->position.x * 2)] != WALL_GL_REDBOOK)
-			rat->rotation = NORTH;
-		else if (maze->mazeGrid[(int)(rat->position.z * 2)]
-				[(int)(rat->position.x * 2) - 1]
-				!= WALL && maze->mazeGrid[(int)(rat->position.z * 2)]
-				[(int)(rat->position.x * 2) - 1] != WALL_GL_REDBOOK)
-			rat->rotation = WEST;
-		else
-			rat->rotation = SOUTH;
-	}
-
-# ifdef USE_FLOATING_IMAGES
-	for (i = 0; i < numGlRedbooks; i++) {
-		while (!(((isOdd(temp.row) && isEven(temp.column))
-					|| (isEven(temp.row) && isOdd(temp.column)))
-					&& maze->mazeGrid[temp.row][temp.column] == WALL)) {
-			temp.row = random() % maze->numRows;
-			temp.column = random() % maze->numColumns;
-		}
-
-		maze->mazeGrid[temp.row][temp.column] = WALL_GL_REDBOOK;
-	}
-# endif
-}
-
-static Tuple
-placeObject(maze_configuration* maze, unsigned char type)
-{
-	Tuple position = {0, 0};
-
-	while (!(maze->mazeGrid[position.row][position.column] == CELL
-			&& isOdd(position.row) && isOdd(position.column))) {
-		position.row = random() % maze->numRows;
-		position.column = random() % maze->numColumns;
-	}
-
-	maze->mazeGrid[position.row][position.column] = type;
-	return position;
-}
-
-ENTRYPOINT void
-reshape_maze (ModeInfo *mi, int width, int height)
-{
-	glViewport(0, 0, (GLint) width, (GLint) height);
-	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-}
-
-
-ENTRYPOINT Bool
-maze_handle_event (ModeInfo *mi, XEvent *event)
-{
-  maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-  if (event->xany.type == ButtonPress)
-    {
-      maze->button_down_p = True;
-      return True;
-    }
-  else if (event->xany.type == ButtonRelease)
-    {
-      maze->button_down_p = False;
-      return True;
-    }
-  return False;
-}
-
-ENTRYPOINT void
-init_maze (ModeInfo * mi)
-{
-	unsigned i;
-	maze_configuration *maze;
-	GLfloat ambient[] = {0, 0, 0, 1},
-			diffuse[] = {1, 1, 1, 1},
-			position[] = {0, 2, 0, 0},
-			mcolor[] = {1, 1, 1, 1};
-
-	MI_INIT(mi, mazes);
-	maze = &mazes[MI_SCREEN(mi)];
-
-	maze->glx_context = init_GL(mi);
-
-	reshape_maze(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
-
-    for (i = 0; i < countof(maze->dlists); i++)
-      maze->dlists[i] = glGenLists (1);
-
-	maze->numRows = (numRows < 2 ? 5 : numRows * 2 + 1);
-	maze->numColumns = (numColumns < 2 ? 5 : numColumns * 2 + 1);
-
-	i = (maze->numRows / 2) * (maze->numColumns / 2) - 2;
-	if (i < numInverters) {
-		numInverters = i;
-		i = 0;
-	} else i -= numInverters;
-
-	if (i < numRats) {
-		numRats = i;
-		i = 0;
-	} else i -= numRats;
-# ifdef USE_FLOATING_IMAGES
-	if (i < numGl3dTexts) {
-		numGl3dTexts = i;
-		i = 0;
-	} else i -= numGl3dTexts;
-
-	if (((maze->numRows - 1) + (maze->numColumns - 1)
-				+ ((maze->numRows / 2 - 1) * (maze->numColumns / 2 - 1))) < maze->numGlRedbooks)
-		maze->numGlRedbooks = (maze->numRows - 1) + (maze->numColumns - 1)
-				+ ((maze->numRows / 2 - 1) * (maze->numColumns / 2 - 1));
-# endif
-
-	glEnable(GL_DEPTH_TEST);
-	glEnable(GL_TEXTURE_2D);
-	glEnable(GL_LIGHT0);
-
-	glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
-	glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
-	glLightfv(GL_LIGHT0, GL_POSITION, position);
-	glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mcolor);
-
-	glShadeModel(GL_FLAT);
-
-	maze->mazeGrid = calloc(maze->numRows, sizeof(unsigned char*));
-	for (i = 0; i < maze->numRows; i++)
-		maze->mazeGrid[i] = calloc(maze->numColumns, sizeof(unsigned char));
-	maze->wallList = calloc(((maze->numColumns - 2) / 2) * ((maze->numRows - 2) / 2 + 1)
-			+ ((maze->numColumns - 2) / 2 + 1) * ((maze->numRows - 2) / 2), sizeof(Tuple));
-	maze->inverterPosition = calloc(numInverters, sizeof(Tuple));
-	maze->rats = calloc(numRats, sizeof(Rat));
-# ifdef USE_FLOATING_IMAGES
-	maze->gl3dTextPosition = calloc(numGl3dTexts, sizeof(Tuple));
-#endif
-
-	setup_textures(mi);
-
-	newMaze(maze);
-
-	constructLists(mi);
-	refreshRemainingDistanceToTravel(mi);
-
-	maze->camera.isCamera = 1;
-	for (i = 0; i < numRats; i++)
-		maze->rats[i].isCamera = 0;
-}
-
-static void
-newMaze(maze_configuration* maze)
-{
-	maze->camera.state = STARTING;
-	maze->camera.inversion = 0;
-	maze->wallHeight = 0;
-	maze->inverterRotation = 0;
-	maze->acidHue = 0;
-
-	initializeGrid(maze);
-	buildMaze(maze);
-	placeMiscObjects(maze);
-}
-
-static void
-constructLists(ModeInfo *mi)
-{
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-
-	glNewList(maze->dlists[ARROW], GL_COMPILE);
-		glBegin(GL_POLYGON);
-		glVertex2f(0, -0.25);
-		glVertex2f(0.146946313, 0.202254249);
-		glVertex2f(0, 0.125);
-		glVertex2f(-0.146946313, 0.202254249);
-		glEnd();
-	glEndList();
-
-	glNewList(maze->dlists[SQUARE], GL_COMPILE);
-		glBegin(GL_QUADS);
-		glVertex2f(-0.176776695, -0.176776695);
-		glVertex2f(0.176776695, -0.176776695);
-		glVertex2f(0.176776695, 0.176776695);
-		glVertex2f(-0.176776695, 0.176776695);
-		glEnd();
-	glEndList();
-
-	glNewList(maze->dlists[STAR], GL_COMPILE);
-		glBegin(GL_TRIANGLE_FAN);
-		glVertex2f(0, 0);
-		glVertex2f(0, -0.25);
-		glVertex2f(0.073473157, -0.101127124);
-		glVertex2f(0.237764129, -0.077254249);
-		glVertex2f(0.118882065, 0.038627124);
-		glVertex2f(0.146946313, 0.202254249);
-		glVertex2f(0, 0.125);
-		glVertex2f(-0.146946313, 0.202254249);
-		glVertex2f(-0.118882065, 0.038627124);
-		glVertex2f(-0.237764129, -0.077254249);
-		glVertex2f(-0.073473157, -0.101127124);
-		glVertex2f(0, -0.25);
-		glEnd();
-	glEndList();
-
-	glNewList(maze->dlists[TRIANGLE], GL_COMPILE);
-		glBegin(GL_POLYGON);
-		glVertex2f(0, -0.25);
-		glVertex2f(0.216506351, 0.125);
-		glVertex2f(-0.216506351, 0.125);
-		glEnd();
-	glEndList();
-
-	glNewList(maze->dlists[INVERTER_TETRAHEDRON], GL_COMPILE);
-		glBegin(GL_TRIANGLES);
-		glNormal3f(0.471404521, 0.816496581, 0.333333333);
-		glVertex3f(0, 0, 0.25);
-		glVertex3f(0.23570226, 0, -0.083333333);
-		glVertex3f(-0.11785113, 0.204124145, -0.083333333);
-
-		glNormal3f(-0.942809042, 0, 0.333333333);
-		glVertex3f(0, 0, 0.25);
-		glVertex3f(-0.11785113, 0.204124145, -0.083333333);
-		glVertex3f(-0.11785113, -0.204124145, -0.083333333);
-
-		glNormal3f(0.471404521, -0.816496581, 0.333333333);
-		glVertex3f(0, 0, 0.25);
-		glVertex3f(-0.11785113, -0.204124145, -0.083333333);
-		glVertex3f(0.23570226, 0, -0.083333333);
-
-		glNormal3f(0, 0, -1);
-		glVertex3f(0.23570226, 0, -0.083333333);
-		glVertex3f(-0.11785113, -0.204124145, -0.083333333);
-		glVertex3f(-0.11785113, 0.204124145, -0.083333333);
-		glEnd();
-	glEndList();
-
-	glNewList(maze->dlists[INVERTER_OCTAHEDRON], GL_COMPILE);
-		glBegin(GL_TRIANGLES);
-		glNormal3f(0.577350269, 0.577350269, 0.577350269);
-		glVertex3f(0, 0, 0.25);
-		glVertex3f(0.25, 0, 0);
-		glVertex3f(0, 0.25, 0);
-
-		glNormal3f(-0.577350269, 0.577350269, 0.577350269);
-		glVertex3f(0, 0, 0.25);
-		glVertex3f(0, 0.25, 0);
-		glVertex3f(-0.25, 0, 0);
-
-		glNormal3f(-0.577350269, -0.577350269, 0.577350269);
-		glVertex3f(0, 0, 0.25);
-		glVertex3f(-0.25, 0, 0);
-		glVertex3f(0, -0.25, 0);
-
-		glNormal3f(0.577350269, -0.577350269, 0.577350269);
-		glVertex3f(0, 0, 0.25);
-		glVertex3f(0, -0.25, 0);
-		glVertex3f(0.25, 0, 0);
-
-		glNormal3f(0.577350269, -0.577350269, -0.577350269);
-		glVertex3f(0.25, 0, 0);
-		glVertex3f(0, -0.25, 0);
-		glVertex3f(0, 0, -0.25);
-
-		glNormal3f(0.577350269, 0.577350269, -0.577350269);
-		glVertex3f(0.25, 0, 0);
-		glVertex3f(0, 0, -0.25);
-		glVertex3f(0, 0.25, 0);
-
-		glNormal3f(-0.577350269, 0.577350269, -0.577350269);
-		glVertex3f(0, 0.25, 0);
-		glVertex3f(0, 0, -0.25);
-		glVertex3f(-0.25, 0, 0);
-
-		glNormal3f(-0.577350269, -0.577350269, -0.577350269);
-		glVertex3f(-0.25, 0, 0);
-		glVertex3f(0, 0, -0.25);
-		glVertex3f(0, -0.25, 0);
-		glEnd();
-	glEndList();
-
-	glNewList(maze->dlists[INVERTER_DODECAHEDRON], GL_COMPILE);
-		glBegin(GL_POLYGON);
-		glNormal3f(0.000000000, 0.000000000, 1.000000000);
-		glVertex3f(0.122780868, 0.089205522, 0.198663618);
-		glVertex3f(-0.046898119, 0.144337567, 0.198663618);
-		glVertex3f(-0.151765500, 0.000000000, 0.198663618);
-		glVertex3f(-0.046898119, -0.144337567, 0.198663618);
-		glVertex3f(0.122780868, -0.089205522, 0.198663618);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(0.894427191, 0.000000000, 0.447213595);
-		glVertex3f(0.198663618, -0.144337567, 0.046898119);
-		glVertex3f(0.245561737, 0.000000000, -0.046898119);
-		glVertex3f(0.198663618, 0.144337567, 0.046898119);
-		glVertex3f(0.122780868, 0.089205522, 0.198663618);
-		glVertex3f(0.122780868, -0.089205522, 0.198663618);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(0.276393202, 0.850650808, 0.447213595);
-		glVertex3f(0.198663618, 0.144337567, 0.046898119);
-		glVertex3f(0.075882750, 0.233543090, -0.046898119);
-		glVertex3f(-0.075882750, 0.233543090, 0.046898119);
-		glVertex3f(-0.046898119, 0.144337567, 0.198663618);
-		glVertex3f(0.122780868, 0.089205522, 0.198663618);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(-0.723606798, 0.525731112, 0.447213595);
-		glVertex3f(-0.075882750, 0.233543090, 0.046898119);
-		glVertex3f(-0.198663618, 0.144337567, -0.046898119);
-		glVertex3f(-0.245561737, 0.000000000, 0.046898119);
-		glVertex3f(-0.151765500, 0.000000000, 0.198663618);
-		glVertex3f(-0.046898119, 0.144337567, 0.198663618);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(-0.723606798, -0.525731112, 0.447213595);
-		glVertex3f(-0.245561737, 0.000000000, 0.046898119);
-		glVertex3f(-0.198663618, -0.144337567, -0.046898119);
-		glVertex3f(-0.075882750, -0.233543090, 0.046898119);
-		glVertex3f(-0.046898119, -0.144337567, 0.198663618);
-		glVertex3f(-0.151765500, 0.000000000, 0.198663618);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(0.276393202, -0.850650808, 0.447213595);
-		glVertex3f(-0.075882750, -0.233543090, 0.046898119);
-		glVertex3f(0.075882750, -0.233543090, -0.046898119);
-		glVertex3f(0.198663618, -0.144337567, 0.046898119);
-		glVertex3f(0.122780868, -0.089205522, 0.198663618);
-		glVertex3f(-0.046898119, -0.144337567, 0.198663618);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(0.723606798, 0.525731112, -0.447213595);
-		glVertex3f(0.245561737, 0.000000000, -0.046898119);
-		glVertex3f(0.151765500, 0.000000000, -0.198663618);
-		glVertex3f(0.046898119, 0.144337567, -0.198663618);
-		glVertex3f(0.075882750, 0.233543090, -0.046898119);
-		glVertex3f(0.198663618, 0.144337567, 0.046898119);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(0.723606798, -0.525731112, -0.447213595);
-		glVertex3f(0.198663618, -0.144337567, 0.046898119);
-		glVertex3f(0.075882750, -0.233543090, -0.046898119);
-		glVertex3f(0.046898119, -0.144337567, -0.198663618);
-		glVertex3f(0.151765500, 0.000000000, -0.198663618);
-		glVertex3f(0.245561737, 0.000000000, -0.046898119);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(-0.276393202, 0.850650808, -0.447213595);
-		glVertex3f(0.075882750, 0.233543090, -0.046898119);
-		glVertex3f(0.046898119, 0.144337567, -0.198663618);
-		glVertex3f(-0.122780868, 0.089205522, -0.198663618);
-		glVertex3f(-0.198663618, 0.144337567, -0.046898119);
-		glVertex3f(-0.075882750, 0.233543090, 0.046898119);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(-0.894427191, 0.000000000, -0.447213595);
-		glVertex3f(-0.198663618, 0.144337567, -0.046898119);
-		glVertex3f(-0.122780868, 0.089205522, -0.198663618);
-		glVertex3f(-0.122780868, -0.089205522, -0.198663618);
-		glVertex3f(-0.198663618, -0.144337567, -0.046898119);
-		glVertex3f(-0.245561737, 0.000000000, 0.046898119);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(-0.276393202, -0.850650808, -0.447213595);
-		glVertex3f(-0.198663618, -0.144337567, -0.046898119);
-		glVertex3f(-0.122780868, -0.089205522, -0.198663618);
-		glVertex3f(0.046898119, -0.144337567, -0.198663618);
-		glVertex3f(0.075882750, -0.233543090, -0.046898119);
-		glVertex3f(-0.075882750, -0.233543090, 0.046898119);
-		glEnd();
-
-		glBegin(GL_POLYGON);
-		glNormal3f(0.000000000, 0.000000000, -1.000000000);
-		glVertex3f(0.046898119, -0.144337567, -0.198663618);
-		glVertex3f(-0.122780868, -0.089205522, -0.198663618);
-		glVertex3f(-0.122780868, 0.089205522, -0.198663618);
-		glVertex3f(0.046898119, 0.144337567, -0.198663618);
-		glVertex3f(0.151765500, 0.000000000, -0.198663618);
-		glEnd();
-	glEndList();
-
-	glNewList(maze->dlists[INVERTER_ICOSAHEDRON], GL_COMPILE);
-		glBegin(GL_TRIANGLES);
-		glNormal3f(0.491123473, 0.356822090, 0.794654473);
-		glVertex3f(0.000000000, 0.000000000, 0.250000000);
-		glVertex3f(0.223606798, 0.000000000, 0.111803399);
-		glVertex3f(0.069098301, 0.212662702, 0.111803399);
-
-		glNormal3f(-0.187592474, 0.577350269, 0.794654473);
-		glVertex3f(0.000000000, 0.000000000, 0.250000000);
-		glVertex3f(0.069098301, 0.212662702, 0.111803399);
-		glVertex3f(-0.180901699, 0.131432778, 0.111803399);
-
-		glNormal3f(-0.607061998, 0.000000000, 0.794654473);
-		glVertex3f(0.000000000, 0.000000000, 0.250000000);
-		glVertex3f(-0.180901699, 0.131432778, 0.111803399);
-		glVertex3f(-0.180901699, -0.131432778, 0.111803399);
-
-		glNormal3f(-0.187592474, -0.577350269, 0.794654473);
-		glVertex3f(0.000000000, 0.000000000, 0.250000000);
-		glVertex3f(-0.180901699, -0.131432778, 0.111803399);
-		glVertex3f(0.069098301, -0.212662702, 0.111803399);
-
-		glNormal3f(0.491123473, -0.356822090, 0.794654473);
-		glVertex3f(0.000000000, 0.000000000, 0.250000000);
-		glVertex3f(0.069098301, -0.212662702, 0.111803399);
-		glVertex3f(0.223606798, 0.000000000, 0.111803399);
-
-		glNormal3f(0.794654473, -0.577350269, 0.187592474);
-		glVertex3f(0.223606798, 0.000000000, 0.111803399);
-		glVertex3f(0.069098301, -0.212662702, 0.111803399);
-		glVertex3f(0.180901699, -0.131432778, -0.111803399);
-
-		glNormal3f(0.982246947, 0.000000000, -0.187592474);
-		glVertex3f(0.223606798, 0.000000000, 0.111803399);
-		glVertex3f(0.180901699, -0.131432778, -0.111803399);
-		glVertex3f(0.180901699, 0.131432778, -0.111803399);
-
-		glNormal3f(0.794654473, 0.577350269, 0.187592474);
-		glVertex3f(0.223606798, 0.000000000, 0.111803399);
-		glVertex3f(0.180901699, 0.131432778, -0.111803399);
-		glVertex3f(0.069098301, 0.212662702, 0.111803399);
-
-		glNormal3f(0.303530999, 0.934172359, -0.187592474);
-		glVertex3f(0.069098301, 0.212662702, 0.111803399);
-		glVertex3f(0.180901699, 0.131432778, -0.111803399);
-		glVertex3f(-0.069098301, 0.212662702, -0.111803399);
-
-		glNormal3f(-0.303530999, 0.934172359, 0.187592474);
-		glVertex3f(0.069098301, 0.212662702, 0.111803399);
-		glVertex3f(-0.069098301, 0.212662702, -0.111803399);
-		glVertex3f(-0.180901699, 0.131432778, 0.111803399);
-
-		glNormal3f(-0.794654473, 0.577350269, -0.187592474);
-		glVertex3f(-0.180901699, 0.131432778, 0.111803399);
-		glVertex3f(-0.069098301, 0.212662702, -0.111803399);
-		glVertex3f(-0.223606798, 0.000000000, -0.111803399);
-
-		glNormal3f(-0.982246947, 0.000000000, 0.187592474);
-		glVertex3f(-0.180901699, 0.131432778, 0.111803399);
-		glVertex3f(-0.223606798, 0.000000000, -0.111803399);
-		glVertex3f(-0.180901699, -0.131432778, 0.111803399);
-
-		glNormal3f(-0.794654473, -0.577350269, -0.187592474);
-		glVertex3f(-0.180901699, -0.131432778, 0.111803399);
-		glVertex3f(-0.223606798, 0.000000000, -0.111803399);
-		glVertex3f(-0.069098301, -0.212662702, -0.111803399);
-
-		glNormal3f(-0.303530999, -0.934172359, 0.187592474);
-		glVertex3f(-0.180901699, -0.131432778, 0.111803399);
-		glVertex3f(-0.069098301, -0.212662702, -0.111803399);
-		glVertex3f(0.069098301, -0.212662702, 0.111803399);
-
-		glNormal3f(0.303530999, -0.934172359, -0.187592474);
-		glVertex3f(0.069098301, -0.212662702, 0.111803399);
-		glVertex3f(-0.069098301, -0.212662702, -0.111803399);
-		glVertex3f(0.180901699, -0.131432778, -0.111803399);
-
-		glNormal3f(0.607061998, 0.000000000, -0.794654473);
-		glVertex3f(0.180901699, 0.131432778, -0.111803399);
-		glVertex3f(0.180901699, -0.131432778, -0.111803399);
-		glVertex3f(0.000000000, 0.000000000, -0.250000000);
-
-		glNormal3f(0.187592474, 0.577350269, -0.794654473);
-		glVertex3f(0.180901699, 0.131432778, -0.111803399);
-		glVertex3f(0.000000000, 0.000000000, -0.250000000);
-		glVertex3f(-0.069098301, 0.212662702, -0.111803399);
-
-		glNormal3f(0.187592474, -0.577350269, -0.794654473);
-		glVertex3f(0.180901699, -0.131432778, -0.111803399);
-		glVertex3f(-0.069098301, -0.212662702, -0.111803399);
-		glVertex3f(0.000000000, 0.000000000, -0.250000000);
-
-		glNormal3f(-0.491123473, 0.356822090, -0.794654473);
-		glVertex3f(-0.069098301, 0.212662702, -0.111803399);
-		glVertex3f(0.000000000, 0.000000000, -0.250000000);
-		glVertex3f(-0.223606798, 0.000000000, -0.111803399);
-
-		glNormal3f(-0.491123473, -0.356822090, -0.794654473);
-		glVertex3f(-0.223606798, 0.000000000, -0.111803399);
-		glVertex3f(0.000000000, 0.000000000, -0.250000000);
-		glVertex3f(-0.069098301, -0.212662702, -0.111803399);
-		glEnd();
-	glEndList();
-}
-
-ENTRYPOINT void
-draw_maze (ModeInfo * mi)
-{
-	unsigned i;
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-	GLfloat h = (GLfloat) MI_HEIGHT(mi) / MI_WIDTH(mi);
-
-    if (!maze->glx_context)
-      return;
-	glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *maze->glx_context);
-
-	glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-	gluPerspective(90, 1/h, 0.05, 100);
-
-    if (MI_WIDTH(mi) > 2560)  /* Retina displays */
-      glLineWidth (6);
-    else
-# ifdef HAVE_MOBILE
-      glLineWidth (4);
-# else
-      glLineWidth (2);
-# endif
-
-	glRotatef(maze->camera.inversion, 0, 0, 1);
-	glRotatef(maze->camera.rotation, 0, 1, 0);
-	glTranslatef(-1 * maze->camera.position.x, -0.5,
-			-1 * maze->camera.position.z);
-
-	refreshRemainingDistanceToTravel(mi);
-
-	updateInverterRotation(maze);
-	shiftAcidColor(maze);
-	step(&maze->camera, maze);
-
-	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-	drawWalls(mi);
-	drawCeiling(mi);
-	drawFloor(mi);
-
-	for (i = 0; i < numInverters; i++)
-		drawInverter(maze, maze->inverterPosition[i]);
-
-# ifdef USE_FLOATING_IMAGES
-	for (i = 0; i < numGl3dTexts; i++)
-		drawPane(mi, maze->gl3dTextTexture, maze->gl3dTextPosition[i]);
-# endif
-
-	for (i = 0; i < numRats; i++) {
-		step(&maze->rats[i], maze);
-		drawRat(maze->rats[i].position, maze);
-	}
-
-	drawPane(mi, maze->finishTexture, maze->finishPosition);
-	drawPane(mi, maze->startTexture, maze->startPosition);
-
-	if (shouldDrawOverlay || maze->button_down_p)
-      drawOverlay(mi);
-
-	if (mi->fps_p) do_fps(mi);
-    glFinish();
-	glXSwapBuffers(MI_DISPLAY(mi), MI_WINDOW(mi));
-}
-
-static void
-shiftAcidColor(maze_configuration* maze)
-{
-	GLfloat x = 1 - fabs(fmod(maze->acidHue / 60.0, 2) - 1);
-
-	if (0 <= maze->acidHue && maze->acidHue <= 60) {
-		maze->acidColor.red = 1;
-		maze->acidColor.green = x;
-		maze->acidColor.blue = 0;
-	} else if (60 <= maze->acidHue && maze->acidHue <= 120) {
-		maze->acidColor.red = x;
-		maze->acidColor.green = 1;
-		maze->acidColor.blue = 0;
-	} else if (120 <= maze->acidHue && maze->acidHue <= 180) {
-		maze->acidColor.red = 0;
-		maze->acidColor.green = 1;
-		maze->acidColor.blue = x;
-	} else if (180 <= maze->acidHue && maze->acidHue <= 240) {
-		maze->acidColor.red = 0;
-		maze->acidColor.green = x;
-		maze->acidColor.blue = 1;
-	} else if (240 <= maze->acidHue && maze->acidHue <= 300) {
-		maze->acidColor.red = x;
-		maze->acidColor.green = 0;
-		maze->acidColor.blue = 1;
-	} else {
-		maze->acidColor.red = 1;
-		maze->acidColor.green = 0;
-		maze->acidColor.blue = x;
-	}
-
-	maze->acidHue += 75 * maze->camera.remainingDistanceToTravel;
-	if (maze->acidHue >= 360) maze->acidHue -= 360;
-}
-
-static void
-refreshRemainingDistanceToTravel(ModeInfo * mi)
-{
-	unsigned i;
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-	maze->camera.remainingDistanceToTravel
-		= speed * 1.6 * (MI_DELAY(mi) / 1000000.0);
-	for (i = 0; i < numRats; i++)
-		maze->rats[i].remainingDistanceToTravel =
-			maze->camera.remainingDistanceToTravel;
-}
-
-static void
-step(Rat* rat, maze_configuration* maze)
-{
-	GLfloat previousWallHeight = maze->wallHeight;
-
-	if (!rat->isCamera && (maze->wallHeight < 1
-				|| (rat->position.x == 0 && rat->position.z == 0)))
-		return;
-
-	while (rat->remainingDistanceToTravel > 0) {
-		switch(rat->state) {
-			case WALKING:
-				switch((int)rat->rotation) {
-					case NORTH:
-						walk(rat, 'z', -1, maze);
-						break;
-					case EAST:
-						walk(rat, 'x', 1, maze);
-						break;
-					case SOUTH:
-						walk(rat, 'z', 1, maze);
-						break;
-					case WEST:
-						walk(rat, 'x', -1, maze);
-						break;
-					default:
-						rat->rotation = 90 * roundf(rat->rotation / 90.0);
-						break;
-				}
-				break;
-			case TURNING_LEFT:
-				turn(rat, maze);
-				break;
-			case TURNING_RIGHT:
-				turn(rat, maze);
-				break;
-			case TURNING_AROUND:
-				turnAround(rat, maze);
-				break;
-			case INVERTING:
-				invert(maze);
-				break;
-			case STARTING:
-				maze->wallHeight += 0.48 * rat->remainingDistanceToTravel;
-				if (maze->wallHeight > 1.0) {
-					maze->wallHeight = 1.0;
-					rat->remainingDistanceToTravel =
-						fabs(previousWallHeight - maze->wallHeight);
-					changeState(&maze->camera, maze);
-				} else
-					rat->remainingDistanceToTravel = 0;
-				break;
-			case FINISHING:
-				if (maze->wallHeight == 0) {
-					newMaze(maze);
-					rat->remainingDistanceToTravel = 0;
-				}
-				else if (maze->wallHeight < 0) {
-					maze->wallHeight = 0;
-					rat->remainingDistanceToTravel =
-						fabs(previousWallHeight - maze->wallHeight);
-				}
-				else {
-					maze->wallHeight -= 0.48 * rat->remainingDistanceToTravel;
-					rat->remainingDistanceToTravel = 0;
-				}
-				break;
-			default:
-				break;
-		}
-	}
-}
-
-static void
-walk(Rat* rat, char axis, int sign, maze_configuration* maze)
-{
-	GLfloat* component = (axis == 'x' ? &rat->position.x : &rat->position.z);
-	GLfloat previousPosition = *component;
-	int isMultipleOfOneHalf = 0;
-	unsigned temp = (unsigned)((*component) * 2.0);
-
-	if (((*component) * 2) == roundf((*component) * 2))
-		isMultipleOfOneHalf = 1;
-	*component += sign * rat->remainingDistanceToTravel;
-
-	if (!isMultipleOfOneHalf && ((unsigned)((*component) * 2.0)) != temp) {
-		*component = roundToNearestHalf(*component);
-		rat->remainingDistanceToTravel -=
-			fabs((*component) - previousPosition);
-		changeState(rat, maze);
-	} else
-		rat->remainingDistanceToTravel = 0;
-	
-}
-
-static void
-turn(Rat* rat, maze_configuration* maze)
-{
-	Tuplef rotatingAround;
-	GLfloat tangentVectorDirection, previousRotation
-		= rat->rotation;
-
-	if (rat->state == TURNING_LEFT) {
-		tangentVectorDirection = rat->rotation * (M_PI / 180) + M_PI;
-		rotatingAround.x = roundToNearestHalf(rat->position.x
-				+ 0.5 * cos(tangentVectorDirection));
-		rotatingAround.z = roundToNearestHalf(rat->position.z
-				+ 0.5 * sin(tangentVectorDirection));
-
-		rat->rotation -= DEF_ANGULAR_CONVERSION_FACTOR
-			* rat->remainingDistanceToTravel;
-
-		if (previousRotation > WEST && rat->rotation <= WEST) {
-			rat->rotation = WEST;
-			rat->remainingDistanceToTravel -= (M_PI / 180)
-				* fabs(previousRotation - rat->rotation);
-		} else if (previousRotation > SOUTH && rat->rotation <= SOUTH) {
-			rat->rotation = SOUTH;
-			rat->remainingDistanceToTravel -= (M_PI / 180)
-				* fabs(previousRotation - rat->rotation);
-		} else if (previousRotation > EAST && rat->rotation <= EAST) {
-			rat->rotation = EAST;
-			rat->remainingDistanceToTravel -= (M_PI / 180)
-				* fabs(previousRotation - rat->rotation);
-		} else if (previousRotation > NORTH && rat->rotation <= NORTH) {
-			rat->rotation = NORTH;
-			rat->remainingDistanceToTravel -= (M_PI / 180)
-				* fabs(previousRotation - rat->rotation);
-		} else
-			rat->remainingDistanceToTravel = 0;
-
-		tangentVectorDirection = rat->rotation * (M_PI / 180);
-	}
-	else {
-		tangentVectorDirection = rat->rotation * (M_PI / 180);
-		rotatingAround.x = roundToNearestHalf(rat->position.x
-				+ 0.5 * cos(tangentVectorDirection));
-		rotatingAround.z = roundToNearestHalf(rat->position.z
-				+ 0.5 * sin(tangentVectorDirection));
-
-		rat->rotation += DEF_ANGULAR_CONVERSION_FACTOR
-			* rat->remainingDistanceToTravel;
-
-		if (rat->rotation >= 360) {
-			rat->rotation = NORTH;
-			rat->remainingDistanceToTravel -= (M_PI / 180)
-				* fabs(previousRotation - 360);
-		} else if (previousRotation < WEST && rat->rotation >= WEST) {
-			rat->rotation = WEST;
-			rat->remainingDistanceToTravel -= (M_PI / 180)
-				* fabs(previousRotation - rat->rotation);
-		} else if (previousRotation < SOUTH && rat->rotation >= SOUTH) {
-			rat->rotation = SOUTH;
-			rat->remainingDistanceToTravel -= (M_PI / 180)
-				* fabs(previousRotation - rat->rotation);
-		} else if (previousRotation < EAST && rat->rotation >= EAST) {
-			rat->rotation = EAST;
-			rat->remainingDistanceToTravel -= (M_PI / 180)
-				* fabs(previousRotation - rat->rotation);
-		} else
-			rat->remainingDistanceToTravel = 0;
-
-		tangentVectorDirection = rat->rotation * (M_PI / 180) + M_PI;
-	}
-
-	rat->position.x = rotatingAround.x + 0.5 * cos(tangentVectorDirection);
-	rat->position.z = rotatingAround.z + 0.5 * sin(tangentVectorDirection);
-
-	if (rat->rotation < 0)
-		rat->rotation += 360;
-
-	if (rat->rotation == NORTH || rat->rotation == EAST
-			|| rat->rotation == SOUTH || rat->rotation == WEST) {
-		rat->position.x = roundToNearestHalf(rat->position.x);
-		rat->position.z = roundToNearestHalf(rat->position.z);
-		changeState(rat, maze);
-	}
-}
-
-static void
-turnAround(Rat* rat, maze_configuration* maze)
-{
-	GLfloat previousRotation = rat->rotation;
-
-	rat->rotation -= 1.5 * DEF_ANGULAR_CONVERSION_FACTOR
-		* rat->remainingDistanceToTravel;
-
-	if (previousRotation > rat->desiredRotation
-			&& rat->rotation <= rat->desiredRotation) {
-		rat->rotation = rat->desiredRotation;
-		rat->remainingDistanceToTravel -= (M_PI / 180)
-			* fabs(previousRotation - rat->rotation);
-		changeState(rat, maze);
-	}
-	else {
-		rat->remainingDistanceToTravel = 0;
-		if (rat->rotation < 0) rat->rotation += 360;
-	}
-}
-
-static void
-invert(maze_configuration* maze)
-{
-	GLfloat previousInversion = maze->camera.inversion;
-	int shouldChangeState = 0;
-	unsigned cameraX = (unsigned)roundf(maze->camera.position.x * 2),
-			 cameraZ = (unsigned)roundf(maze->camera.position.z * 2);
-
-	maze->camera.inversion += 1.5 * DEF_ANGULAR_CONVERSION_FACTOR
-		* maze->camera.remainingDistanceToTravel;
-	if (previousInversion < 180 && maze->camera.inversion >= 180) {
-		maze->camera.inversion = 180;
-		maze->camera.remainingDistanceToTravel -= (M_PI / 180)
-			* fabs(previousInversion - maze->camera.inversion);
-		shouldChangeState = 1;
-	}
-	else if (maze->camera.inversion >= 360) {
-		maze->camera.inversion = 0;
-		maze->camera.remainingDistanceToTravel -= (M_PI / 180)
-			* fabs(previousInversion - maze->camera.inversion);
-		shouldChangeState = 1;
-	} else
-		maze->camera.remainingDistanceToTravel = 0;
-
-	if (shouldChangeState) {
-		switch ((int)maze->camera.rotation) {
-			case NORTH:
-				maze->mazeGrid[cameraZ - 1][cameraX] = CELL;
-				break;
-			case EAST:
-				maze->mazeGrid[cameraZ][cameraX + 1] = CELL;
-				break;
-			case SOUTH:
-				maze->mazeGrid[cameraZ + 1][cameraX] = CELL;
-				break;
-			case WEST:
-				maze->mazeGrid[cameraZ][cameraX - 1] = CELL;
-				break;
-			default:
-				break;
-		}
-
-		changeState(&maze->camera, maze);
-	}
-}
-
-static void
-changeState(Rat* rat, maze_configuration* maze)
-{
-	unsigned char inFrontOfRat, toTheLeft, straightAhead, toTheRight;
-	unsigned ratX = (unsigned)roundf(rat->position.x * 2),
-			 ratZ = (unsigned)roundf(rat->position.z * 2);
-
-	switch ((int)rat->rotation) {
-		case NORTH:
-			inFrontOfRat = maze->mazeGrid[ratZ - 1][ratX];
-			toTheLeft = maze->mazeGrid[ratZ - 1][ratX - 1];
-			straightAhead = maze->mazeGrid[ratZ - 2][ratX];
-			toTheRight = maze->mazeGrid[ratZ - 1][ratX + 1];
-			break;
-		case EAST:
-			inFrontOfRat = maze->mazeGrid[ratZ][ratX + 1];
-			toTheLeft = maze->mazeGrid[ratZ - 1][ratX + 1];
-			straightAhead = maze->mazeGrid[ratZ][ratX + 2];
-			toTheRight = maze->mazeGrid[ratZ + 1][ratX + 1];
-			break;
-		case SOUTH:
-			inFrontOfRat = maze->mazeGrid[ratZ + 1][ratX];
-			toTheLeft = maze->mazeGrid[ratZ + 1][ratX + 1];
-			straightAhead = maze->mazeGrid[ratZ + 2][ratX];
-			toTheRight = maze->mazeGrid[ratZ + 1][ratX - 1];
-			break;
-		case WEST:
-			inFrontOfRat = maze->mazeGrid[ratZ][ratX - 1];
-			toTheLeft = maze->mazeGrid[ratZ + 1][ratX - 1];
-			straightAhead = maze->mazeGrid[ratZ][ratX - 2];
-			toTheRight = maze->mazeGrid[ratZ - 1][ratX - 1];
-			break;
-		default:
-			inFrontOfRat = toTheLeft = straightAhead = toTheRight = CELL;
-			break;
-	}
-
-	if (rat->isCamera && inFrontOfRat == FINISH)
-		rat->state = FINISHING;
-	else if (rat->isCamera && inFrontOfRat >= INVERTER_TETRAHEDRON
-			&& inFrontOfRat <= INVERTER_ICOSAHEDRON)
-		rat->state = INVERTING;
-	else if (toTheLeft != WALL && toTheLeft != WALL_GL_REDBOOK)
-		rat->state = TURNING_LEFT;
-	else if (straightAhead != WALL && straightAhead != WALL_GL_REDBOOK)
-		rat->state = WALKING;
-	else if (toTheRight != WALL && toTheRight != WALL_GL_REDBOOK)
-		rat->state = TURNING_RIGHT;
-	else {
-		rat->state = TURNING_AROUND;
-
-		switch ((int)rat->rotation) {
-			case NORTH:
-				rat->desiredRotation = SOUTH;
-				break;
-			case EAST:
-				rat->desiredRotation = WEST;
-				break;
-			case SOUTH:
-				rat->desiredRotation = NORTH;
-				break;
-			case WEST:
-				rat->desiredRotation = EAST;
-				break;
-			default:
-				break;
-		}
-	}
-}
-
-static void
-updateInverterRotation(maze_configuration* maze)
-{
-	maze->inverterRotation += 45 * maze->camera.remainingDistanceToTravel;
-}
-
-static void drawInverter(maze_configuration* maze, Tuple coordinates)
-{
-	unsigned char type = maze->mazeGrid[coordinates.row][coordinates.column];
-
-	if (maze->wallHeight < 1 ||
-			type < INVERTER_TETRAHEDRON || type > INVERTER_ICOSAHEDRON
-			|| (coordinates.row == 0 && coordinates.column == 0))
-		return;
-
-	glEnable(GL_LIGHTING);
-	glEnable(GL_CULL_FACE);
-
-	glMatrixMode(GL_MODELVIEW);
-	glPushMatrix();
-
-	glTranslatef(coordinates.column / 2.0, 0.25, coordinates.row / 2.0);
-	glRotatef(0.618033989 * maze->inverterRotation, 0, 1, 0);
-	glRotatef(maze->inverterRotation, 1, 0, 0);
-
-    if (type >= countof(maze->dlists)) abort();
-	glCallList(maze->dlists[type]);
-
-	glPopMatrix();
-
-	glDisable(GL_LIGHTING);
-	glDisable(GL_CULL_FACE);
-}
-
-static void
-drawWalls(ModeInfo * mi)
-{
-	unsigned i, j;
-	Tuple startCoordinates, endCoordinates;
-
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-
-	for (i = 0; i < maze->numRows; i++) {
-		for (j = 0; j < maze->numColumns; j++) {
-			if (maze->mazeGrid[i][j] == WALL
-					|| maze->mazeGrid[i][j] == WALL_GL_REDBOOK) {
-				if (maze->mazeGrid[i][j] == WALL) {
-					glBindTexture(GL_TEXTURE_2D, maze->wallTexture);
-					if (dropAcid || dropAcidWalls)
-						glColor3f(maze->acidColor.red, maze->acidColor.green,
-								maze->acidColor.blue);
-# ifdef USE_FLOATING_IMAGES
-				} else {
-					glBindTexture(GL_TEXTURE_2D, maze->glTextbookTexture);
-					glColor3f(1, 1, 1);
-# endif
-				}
-
-				if (isOdd(i) && isEven(j)) {
-					startCoordinates.row = i / 2;
-					startCoordinates.column = j / 2;
-					endCoordinates.row = i / 2 + 1;
-					endCoordinates.column = j / 2;
-					drawWall(startCoordinates, endCoordinates, maze);
-				} else if (isEven(i) && isOdd(j)) {
-					startCoordinates.row = i / 2;
-					startCoordinates.column = j / 2;
-					endCoordinates.row = i / 2;
-					endCoordinates.column = j / 2 + 1;
-					drawWall(startCoordinates, endCoordinates, maze);
-				}
-			}
-		}
-	}
-
-	glBindTexture(GL_TEXTURE_2D, 0);
-	glColor3f(1, 1, 1);
-}
-
-static void
-drawWall(Tuple startCoordinates, Tuple endCoordinates, maze_configuration* maze)
-{
-	GLfloat wallHeight = maze->wallHeight;
-
-	glBegin(GL_QUADS);
-		if (startCoordinates.row == endCoordinates.row) {
-			glTexCoord2f(0, 0);
-			glVertex3f(startCoordinates.column, 0, startCoordinates.row);
-			glTexCoord2f(1, 0);
-			glVertex3f(endCoordinates.column, 0, startCoordinates.row);
-			glTexCoord2f(1, 1);
-			glVertex3f(endCoordinates.column, wallHeight, endCoordinates.row);
-			glTexCoord2f(0, 1);
-			glVertex3f(startCoordinates.column, wallHeight, endCoordinates.row);
-		} else {
-			glTexCoord2f(0, 0);
-			glVertex3f(startCoordinates.column, 0, startCoordinates.row);
-			glTexCoord2f(1, 0);
-			glVertex3f(startCoordinates.column, 0, endCoordinates.row);
-			glTexCoord2f(1, 1);
-			glVertex3f(endCoordinates.column, wallHeight, endCoordinates.row);
-			glTexCoord2f(0, 1);
-			glVertex3f(endCoordinates.column, wallHeight, startCoordinates.row);
-		}
-	glEnd();
-}
-
-static void
-drawCeiling(ModeInfo * mi)
-{
-	Tuple farRightCorner;
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-	farRightCorner.row = maze->numRows / 2;
-	farRightCorner.column = maze->numColumns / 2;
-	glBindTexture(GL_TEXTURE_2D, maze->ceilingTexture);
-
-	glBegin(GL_QUADS);
-		if (dropAcid || dropAcidCeiling)
-			glColor3f(maze->acidColor.red, maze->acidColor.green,
-					maze->acidColor.blue);
-		glTexCoord2f(0, 0);
-		glVertex3f(0, 1, 0);
-		glTexCoord2f(farRightCorner.column, 0);
-		glVertex3f(farRightCorner.column, 1, 0);
-		glTexCoord2f(farRightCorner.column, farRightCorner.row);
-		glVertex3f(farRightCorner.column, 1, farRightCorner.row);
-		glTexCoord2f(0, farRightCorner.row);
-		glVertex3f(0, 1, farRightCorner.row);
-		glColor3f(1, 1, 1);
-	glEnd();
-
-	glBindTexture(GL_TEXTURE_2D, 0);
-}
-
-static void
-drawFloor(ModeInfo * mi)
-{
-	Tuple farRightCorner;
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-	farRightCorner.row = maze->numRows / 2;
-	farRightCorner.column = maze->numColumns / 2;
-	glBindTexture(GL_TEXTURE_2D, maze->floorTexture);
-
-	glBegin(GL_QUADS);
-		if (dropAcid || dropAcidFloor)
-			glColor3f(maze->acidColor.red, maze->acidColor.green,
-					maze->acidColor.blue);
-		glTexCoord2f(0, 0);
-		glVertex3f(0, 0, 0);
-		glTexCoord2f(farRightCorner.column, 0);
-		glVertex3f(farRightCorner.column, 0, 0);
-		glTexCoord2f(farRightCorner.column, farRightCorner.row);
-		glVertex3f(farRightCorner.column, 0, farRightCorner.row);
-		glTexCoord2f(0, farRightCorner.row);
-		glVertex3f(0, 0, farRightCorner.row);
-		glColor3f(1, 1, 1);
-	glEnd();
-
-	glBindTexture(GL_TEXTURE_2D, 0);
-}
-
-static void
-drawPane(ModeInfo *mi, GLuint texture, Tuple position)
-{
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-	if (position.row == 0 && position.column == 0) return;
-
-	glEnable(GL_BLEND);
-	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
-	glBindTexture(GL_TEXTURE_2D, texture);
-
-	glMatrixMode(GL_MODELVIEW);
-	glPushMatrix();
-	glTranslatef(position.column / 2.0, 0, position.row / 2.0);
-	glRotatef(-1 * maze->camera.rotation - 90, 0, 1, 0);
-
-    if (MI_WIDTH(mi) < MI_HEIGHT(mi))
-      {
-        /* Keep the Start button readable in phone portrait mode. */
-        glScalef (0.5, 0.5, 0.5);
-        glTranslatef (0, 0.5, 0);
-      }
-
-	glBegin(GL_QUADS);
-		glColor4f(1, 1, 1, 0.9);
-		glTexCoord2f(0, 0);
-		glVertex3f(0, 0, 0.5);
-		glTexCoord2f(1, 0);
-		glVertex3f(0, 0, -0.5);
-		glTexCoord2f(1, 1);
-		glVertex3f(0, maze->wallHeight, -0.5);
-		glTexCoord2f(0, 1);
-		glVertex3f(0, maze->wallHeight, 0.5);
-		glColor3f(1, 1, 1);
-	glEnd();
-
-	glPopMatrix();
-	glBindTexture(GL_TEXTURE_2D, 0);
-	glDisable(GL_BLEND);
-}
-
-static void
-drawRat(Tuplef position, maze_configuration* maze)
-{
-	if (position.x == 0 && position.z == 0) return;
-
-	glEnable(GL_BLEND);
-	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
-	glBindTexture(GL_TEXTURE_2D, maze->ratTexture);
-
-	glMatrixMode(GL_MODELVIEW);
-	glPushMatrix();
-	glTranslatef(position.x, 0, position.z);
-	glRotatef(-1 * maze->camera.rotation - 90, 0, 1, 0);
-
-    glScalef (0.25, 0.25, 0.25);
-	glBegin(GL_QUADS);
-		glTexCoord2f(0, 0);
-		glVertex3f(0, 0, 0.5);
-		glTexCoord2f(1, 0);
-		glVertex3f(0, 0, -0.5);
-		glTexCoord2f(1, 1);
-		glVertex3f(0, maze->wallHeight, -0.5);
-		glTexCoord2f(0, 1);
-		glVertex3f(0, maze->wallHeight, 0.5);
-	glEnd();
-
-	glPopMatrix();
-	glBindTexture(GL_TEXTURE_2D, 0);
-	glDisable(GL_BLEND);
-}
-
-
-static void drawOverlay(ModeInfo *mi)
-{
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-	unsigned i, j;
-    GLfloat h = (GLfloat) MI_HEIGHT(mi) / MI_WIDTH(mi);
-
-	glMatrixMode(GL_PROJECTION);
-	glPushMatrix();
-	glLoadIdentity();
-	glMatrixMode(GL_MODELVIEW);
-	glPushMatrix();
-	glLoadIdentity();
-    glOrtho(-1/h, 1/h, 1, -1, -1, 1);
-
-	glEnable(GL_BLEND);
-	glColor4f(0, 0, 1, 0.75);
-	glScalef(0.25, 0.25, 0.25);
-
-	glCallList(maze->dlists[ARROW]);
-
-	glRotatef(maze->camera.inversion, 0, 1, 0);
-	glRotatef(maze->camera.rotation, 0, 0, -1);
-	glTranslatef(-maze->camera.position.x, -maze->camera.position.z, 0);
-	glColor4f(1, 1, 1, 0.75);
-	
-	glBegin(GL_LINES);
-	for (i = 0; i < maze->numRows; i++) {
-		for (j = 0; j < maze->numColumns; j++) {
-			if (maze->mazeGrid[i][j] == WALL
-					|| maze->mazeGrid[i][j] == WALL_GL_REDBOOK) {
-				if (isOdd(i) && isEven(j)) {
-						glVertex2f(j / 2, i / 2);
-						glVertex2f(j / 2, i / 2 + 1);
-				} else if (isEven(i) && isOdd(j)) {
-						glVertex2f(j / 2, i / 2);
-						glVertex2f(j / 2 + 1, i / 2);
-				}
-			}
-		}
-	}
-	glEnd();
-
-	glColor4f(1, 0, 0, 0.75);
-
-	glPushMatrix();
-	glTranslatef(maze->startPosition.column / 2.0,
-			maze->startPosition.row / 2.0, 0);
-	glCallList(maze->dlists[SQUARE]);
-	glPopMatrix();
-
-	glColor4f(1, 1, 0, 0.75);
-
-	glPushMatrix();
-	glTranslatef(maze->finishPosition.column / 2.0,
-			maze->finishPosition.row / 2.0, 0);
-	glCallList(maze->dlists[STAR]);
-	glPopMatrix();
-
-	glColor4f(1, 0.607843137, 0, 0.75);
-
-	for (i = 0; i < numRats; i++) {
-		if (maze->rats[i].position.x == 0 && maze->rats[i].position.z == 0)
-			continue;
-		glPushMatrix();
-		glTranslatef(maze->rats[i].position.x, maze->rats[i].position.z, 0);
-		glRotatef(maze->rats[i].rotation, 0, 0, 1);
-		glCallList(maze->dlists[ARROW]);
-		glPopMatrix();
-	}
-
-	glColor4f(1, 1, 1, 1);
-
-	for (i = 0; i < numInverters; i++) {
-		j = maze->mazeGrid[maze->inverterPosition[i].row]
-			[maze->inverterPosition[i].column];
-		if (j >= INVERTER_TETRAHEDRON && j <= INVERTER_ICOSAHEDRON) {
-			glPushMatrix();
-			glTranslatef(maze->inverterPosition[i].column / 2.0,
-					maze->inverterPosition[i].row / 2.0, 0);
-			glRotatef(1.5 * maze->inverterRotation, 0, 0, 1);
-			glCallList(maze->dlists[TRIANGLE]);
-			glPopMatrix();
-		}
-	}
-
-	glDisable(GL_BLEND);
-
-	glPopMatrix();
-	glMatrixMode(GL_PROJECTION);
-	glPopMatrix();
-}
-
-ENTRYPOINT void
-free_maze (ModeInfo * mi)
-{
-	maze_configuration *maze = &mazes[MI_SCREEN(mi)];
-    int i;
-
-    if (!maze->glx_context) return;
-	glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *maze->glx_context);
-
-    glDeleteTextures(1, &maze->wallTexture);
-    glDeleteTextures(1, &maze->floorTexture);
-    glDeleteTextures(1, &maze->ceilingTexture);
-    glDeleteTextures(1, &maze->startTexture);
-    glDeleteTextures(1, &maze->ratTexture);
-    glDeleteTextures(1, &maze->finishTexture);
-# ifdef USE_FLOATING_IMAGES
-    glDeleteTextures(1, &maze->glTextbookTexture);
-    glDeleteTextures(1, &maze->gl3dTextTexture);
-# endif
-# ifdef USE_FRACTAL_IMAGES
-    glDeleteTextures(1, &maze->fractal1Texture);
-    glDeleteTextures(1, &maze->fractal2Texture);
-    glDeleteTextures(1, &maze->fractal3Texture);
-    glDeleteTextures(1, &maze->fractal4Texture);
-# endif
-
-    for (i = 0; i < countof(maze->dlists); i++)
-      if (glIsList(maze->dlists[i])) glDeleteLists(maze->dlists[i], 1);
-
-    free(maze->mazeGrid);
-    free(maze->wallList);
-    free(maze->inverterPosition);
-    free(maze->gl3dTextPosition);
-    free(maze->rats);
-}
-
-
-XSCREENSAVER_MODULE_2 ("Maze3D", maze3d, maze)
-
-#endif