/* -*- Mode: C; tab-width: 4 -*- */
-/* glhanoi, Copyright (c) 2005 Dave Atkinson <dave.atkinson@uwe.ac.uk>
+/* glhanoi, Copyright (c) 2005, 2009 Dave Atkinson <da@davea.org.uk>
* except noise function code Copyright (c) 2002 Ken Perlin
+ * Modified by Lars Huttar (c) 2010, to generalize to 4 or more poles
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
#define DEF_LIGHT "True"
#define DEF_FOG "False"
#define DEF_TEXTURE "True"
+#define DEF_POLES "0" /* choose random value */
+#define DEF_SPEED "1"
+#define DEF_TRAILS "2"
#define DEFAULTS "*delay: 15000\n" \
"*count: 0\n" \
"*showFPS: False\n" \
"*wireframe: False\n"
-
+
# define refresh_glhanoi 0
+# define release_glhanoi 0
+/* polygon resolution of poles and disks */
#define NSLICE 32
#define NLOOPS 1
+
+/* How long to wait at start and finish (seconds). */
#define START_DURATION 1.0
#define FINISH_DURATION 1.0
#define BASE_LENGTH 30.0
#define BOARD_SQUARES 8
+/* Don't draw trail lines till they're this old (sec).
+ Helps trails not be "attached" to the disks. */
+#define TRAIL_START_DELAY 0.1
+
#define MAX_CAMERA_RADIUS 250.0
#define MIN_CAMERA_RADIUS 75.0
#define MARBLE_SCALE 1.01
#undef BELLRAND
+/* Return a double precision number in [0...n], with bell curve distribution. */
#define BELLRAND(n) ((frand((n)) + frand((n)) + frand((n))) / 3)
enum {
GLfloat base0;
GLfloat base1;
GLfloat height;
- GLfloat xmin, xmax, ymin;
+ GLfloat xmin, xmax, ymin, zmin, zmax;
GLfloat u1, u2;
GLfloat t1, t2;
GLfloat ucostheta, usintheta;
- GLdouble rotAngle;
+ GLfloat dx, dz;
+ GLdouble rotAngle; /* degree of "flipping" so far, during travel */
+ GLdouble phi; /* angle of motion in xz plane */
+ GLfloat speed;
int polys;
} Disk;
Disk **data;
int count;
int size;
-} Stack;
+ GLfloat position[3];
+} Pole;
+
+/* A SubProblem is a recursive subdivision of the problem, and means
+ "Move nDisks disks from src pole to dst pole, using the poles indicated in 'available'." */
+typedef struct {
+ int nDisks;
+ int src, dst;
+ unsigned long available; /* a bitmask of poles that have no smaller disks on them */
+} SubProblem;
+
+typedef struct {
+ GLfloat position[3];
+ double startTime, endTime;
+ Bool isEnd;
+} TrailPoint;
typedef struct {
GLXContext *glx_context;
Bool wire;
Bool fog;
Bool light;
+ Bool layoutLinear;
+ GLfloat trailDuration;
double startTime;
double lastTime;
double duration;
int numberOfDisks;
+ int numberOfPoles;
int numberOfMoves;
int maxDiskIdx;
int magicNumber;
Disk *currentDisk;
int move;
+ /* src, tmp, dst: index of pole that is source / storage / destination for
+ current move */
int src;
int tmp;
int dst;
int oldsrc;
int oldtmp;
int olddst;
- Stack pole[3];
+ GLfloat speed; /* coefficient for how fast the disks move */
+ SubProblem *solveStack;
+ int solveStackSize, solveStackIdx;
+ Pole *pole;
float boardSize;
float baseLength;
float baseWidth;
float poleRadius;
float poleHeight;
float poleOffset;
+ float poleDist; /* distance of poles from center, for round layout */
float diskHeight;
+ float maxDiskRadius;
float *diskPos; /* pre-computed disk positions on rods */
Disk *disk;
GLint floorList;
GLint baseList;
GLint poleList;
int floorpolys, basepolys, polepolys;
+ int trailQSize;
+ TrailPoint *trailQ;
+ int trailQFront, trailQBack;
GLfloat camera[3];
GLfloat centre[3];
rotator *the_rotator;
int drag_x;
int drag_y;
int noise_initted;
-
- int p[512];
-
+ int p[512];
} glhcfg;
static glhcfg *glhanoi_cfg = NULL;
static Bool fog;
static Bool light;
static Bool texture;
+static GLfloat trails;
+static int poles;
+static GLfloat speed;
static XrmOptionDescRec opts[] = {
{"-light", ".glhanoi.light", XrmoptionNoArg, "true"},
{"-fog", ".glhanoi.fog", XrmoptionNoArg, "true"},
{"+fog", ".glhanoi.fog", XrmoptionNoArg, "false"},
{"-texture", ".glhanoi.texture", XrmoptionNoArg, "true"},
- {"+texture", ".glhanoi.texture", XrmoptionNoArg, "false"}
+ {"+texture", ".glhanoi.texture", XrmoptionNoArg, "false"},
+ {"-trails", ".glhanoi.trails", XrmoptionSepArg, 0},
+ {"-poles", ".glhanoi.poles", XrmoptionSepArg, 0 },
+ {"-speed", ".glhanoi.speed", XrmoptionSepArg, 0 }
};
static argtype vars[] = {
{&light, "light", "Light", DEF_LIGHT, t_Bool},
{&fog, "fog", "Fog", DEF_FOG, t_Bool},
- {&texture, "texture", "Texture", DEF_TEXTURE, t_Bool}
+ {&texture, "texture", "Texture", DEF_TEXTURE, t_Bool},
+ {&trails, "trails", "Trails", DEF_TRAILS, t_Float},
+ {&poles, "poles", "Poles", DEF_POLES, t_Int},
+ {&speed, "speed", "Speed", DEF_SPEED, t_Float}
};
static OptionStruct desc[] = {
{"+/-light", "whether to light the scene"},
{"+/-fog", "whether to apply fog to the scene"},
- {"+/-texture", "whether to apply texture to the scene"}
+ {"+/-texture", "whether to apply texture to the scene"},
+ {"-trails t", "how long of disk trails to show (sec.)"},
+ {"-poles r", "number of poles to move disks between"},
+ {"-speed s", "speed multiplier"}
};
ENTRYPOINT ModeSpecOpt glhanoi_opts = { countof(opts), opts, countof(vars), vars, desc };
#ifdef USE_MODULES
ModStruct glhanoi_description = {
- "glhanoi", "init_glhanoi", "draw_glhanoi", "release_glhanoi",
+ "glhanoi", "init_glhanoi", "draw_glhanoi", NULL,
"draw_glhanoi", "init_glhanoi", NULL, &glhanoi_opts,
1000, 1, 2, 1, 4, 1.0, "",
"Towers of Hanoi", 0, NULL
static const GLfloat cWhite[] = { 1.0, 1.0, 1.0, 1.0 };
static const GLfloat poleColor[] = { 0.545, 0.137, 0.137 };
static const GLfloat baseColor[] = { 0.34, 0.34, 0.48 };
+/* static const GLfloat baseColor[] = { 0.545, 0.137, 0.137 }; */
static const GLfloat fogcolor[] = { 0.5, 0.5, 0.5 };
+static GLfloat trailColor[] = { 1.0, 1.0, 1.0, 0.5 };
static const float left[] = { 1.0, 0.0, 0.0 };
static const float up[] = { 0.0, 1.0, 0.0 };
static float g = 3.0 * 9.80665; /* hmm, looks like we need more gravity, Scotty... */
+static void checkAllocAndExit(Bool item, char *descr) {
+ if (!item) {
+ fprintf(stderr, "%s: unable to allocate memory for %s\n",
+ progname, descr);
+ exit(EXIT_FAILURE);
+ }
+}
+
#define DOPUSH(X, Y) (((X)->count) >= ((X)->size)) ? NULL : ((X)->data[(X)->count++] = (Y))
#define DOPOP(X) (X)->count <= 0 ? NULL : ((X)->data[--((X)->count)])
+/* push disk d onto pole idx */
static Disk *push(glhcfg *glhanoi, int idx, Disk * d)
{
return DOPUSH(&glhanoi->pole[idx], d);
}
+/* pop the top disk from pole idx */
static Disk *pop(glhcfg *glhanoi, int idx)
{
return DOPOP(&glhanoi->pole[idx]);
/*
* magic - it's magic...
+ * Return 1 if the number of trailing zeroes on i is even, unless i is 1 or 0.
*/
static int magic(int i)
{
return count % 2 == 0;
}
-#if 0
static float distance(float *p0, float *p1)
{
float x, y, z;
z = p1[2] - p0[2];
return (float)sqrt(x * x + y * y + z * z);
}
-#endif
+/* What is this for?
+ = c / (a b - 0.25 (a^2 + 2 a b + b^2) )
+ = c / (-0.25 (a^2 - 2 a b + b^2) )
+ = c / (-0.25 ((a - b)(a - b)))
+ = -4 c / (a - b)^2
static GLfloat A(GLfloat a, GLfloat b, GLfloat c)
{
GLfloat sum = a + b;
return c / (a * b - 0.25 * sum * sum);
}
+*/
static void moveSetup(glhcfg *glhanoi, Disk * disk)
{
int dst = glhanoi->dst;
GLfloat theta;
GLfloat sintheta, costheta;
+ double dh;
+ double dx, dz; /* total x and z distances from src to dst */
+ Pole *poleSrc, *poleDst;
- if(glhanoi->state != FINISHED && random() % 6 == 0) {
- disk->rotAngle =
- -180.0 * (2 - 2 * random() % 2) * (random() % 3 + 1);
+ poleSrc = &(glhanoi->pole[src]);
+ poleDst = &(glhanoi->pole[dst]);
+
+ disk->xmin = poleSrc->position[0];
+ /* glhanoi->poleOffset * (src - (glhanoi->numberOfPoles - 1.0f) * 0.5); */
+ disk->xmax = poleDst->position[0];
+ /* disk->xmax = glhanoi->poleOffset * (dst - (glhanoi->numberOfPoles - 1.0f) * 0.5); */
+ disk->ymin = glhanoi->poleHeight;
+ disk->zmin = poleSrc->position[2];
+ disk->zmax = poleDst->position[2];
+
+ dx = disk->xmax - disk->xmin;
+ dz = disk->zmax - disk->zmin;
+
+ if(glhanoi->state != FINISHED) {
+ double xxx = ((dx < 0) ? 180.0 : -180.0);
+ if(random() % 6 == 0) {
+ disk->rotAngle = xxx * (2 - 2 * random() % 2) * (random() % 3 + 1);
+ } else {
+ disk->rotAngle = xxx;
+ }
+ if(random() % 4 == 0) {
+ /* Backflip */
+ disk->rotAngle = -disk->rotAngle;
+ }
} else {
disk->rotAngle = -180.0;
}
- disk->base0 = glhanoi->diskPos[glhanoi->pole[src].count];
- disk->base1 =
- glhanoi->state ==
- FINISHED ? disk->base0 : glhanoi->diskPos[glhanoi->pole[dst].
- count];
-
- disk->xmin = glhanoi->poleOffset * (src - 1);
- disk->xmax = glhanoi->poleOffset * (dst - 1);
- disk->ymin = glhanoi->poleHeight;
- ymax =
- glhanoi->poleHeight + fabs(disk->xmax -
- disk->xmin) * (glhanoi->state ==
- FINISHED ? 1.0 +
- (double)(glhanoi->
- numberOfDisks -
- disk->id) /
- (double)glhanoi->
- numberOfDisks : 1.0);
-
+ disk->base0 = glhanoi->diskPos[poleSrc->count];
+ disk->base1 = (glhanoi->state == FINISHED) ?
+ disk->base0 : glhanoi->diskPos[poleDst->count];
+
+ /* horizontal distance to travel? */
+ /* was: absx = sqrt(disk->xmax - disk->xmin); */
+ dh = distance(poleSrc->position, poleDst->position);
+ /* absx = sqrt(dh); */
+ ymax = glhanoi->poleHeight + dh;
+ if(glhanoi->state == FINISHED) {
+ ymax += dh * (double)(glhanoi->numberOfDisks - disk->id);
+ }
h = ymax - disk->ymin;
- theta = atan((disk->xmin - disk->xmax) * A(disk->xmin, disk->xmax, h));
+ /* A(a, b, c) = -4 c / (a - b)^2 */
+ /* theta = atan(4 h / (b - a)) */
+ theta = atan(4 * h / dh);
if(theta < 0.0)
theta += M_PI;
costheta = cos(theta);
u = (float)
sqrt(fabs
(-g /
- (2.0 * A(disk->xmin, disk->xmax, h) * costheta * costheta)));
+ /* (2.0 * A(disk->xmin, disk->xmax, h) * costheta * costheta))); */
+ (2.0 * -4 * h / (dh * dh) * costheta * costheta)));
disk->usintheta = u * sintheta;
disk->ucostheta = u * costheta;
+ /* Not to be confused: disk->dx is the per-time-unit portion of dx */
+ disk->dx = disk->ucostheta * dx / dh;
+ disk->dz = disk->ucostheta * dz / dh;
disk->t1 =
(-u + sqrt(u * u + 2.0 * g * fabs(disk->ymin - disk->base0))) / g;
disk->u1 = u + g * disk->t1;
disk->t2 = 2.0 * disk->usintheta / g;
disk->u2 = disk->usintheta - g * disk->t2;
+
+ /* Compute direction of travel, in the XZ plane. */
+ disk->phi = atan(dz / dx);
+ disk->phi *= 180.0 / M_PI; /* convert radians to degrees */
+}
+
+/* For debugging: show a value as a string of ones and zeroes
+static const char *byteToBinary(int x) {
+ static char b[9];
+ int i, z;
+
+ for (z = 128, i = 0; z > 0; z >>= 1, i++) {
+ b[i] = ((x & z) == z) ? '1' : '0';
+ }
+ b[i] = '\0';
+
+ return b;
+}
+*/
+
+static void pushMove(glhcfg *glhanoi, int n, int src, int dst, int avail) {
+ SubProblem *sp = &(glhanoi->solveStack[glhanoi->solveStackIdx++]);
+
+ if (glhanoi->solveStackIdx > glhanoi->solveStackSize) {
+ fprintf(stderr, "solveStack overflow: pushed index %d: %d from %d to %d, using %d\n",
+ glhanoi->solveStackIdx, n, src, dst, avail);
+ exit(EXIT_FAILURE);
+ }
+
+ sp->nDisks = n;
+ sp->src = src;
+ sp->dst = dst;
+ sp->available = avail & ~((unsigned long)(1 << src))
+ & ~((unsigned long)(1 << dst));
+ /*
+ fprintf(stderr, "Debug: > pushed solveStack %d: %d from %d to %d, using %s\n",
+ glhanoi->solveStackIdx - 1, n, src, dst, byteToBinary(sp->available));
+ */
+}
+
+static Bool solveStackEmpty(glhcfg *glhanoi) {
+ return (glhanoi->solveStackIdx < 1);
}
+static SubProblem *popMove(glhcfg *glhanoi) {
+ SubProblem *sp;
+ if (solveStackEmpty(glhanoi)) return (SubProblem *)NULL;
+ sp = &(glhanoi->solveStack[--glhanoi->solveStackIdx]);
+ /* fprintf(stderr, "Debug: < popped solveStack %d: %d from %d to %d, using %s\n",
+ glhanoi->solveStackIdx, sp->nDisks, sp->src, sp->dst, byteToBinary(sp->available)); */
+ return sp;
+}
+
+/* Return number of bits set in b */
+static int numBits(unsigned long b) {
+ int count = 0;
+ while (b) {
+ count += b & 0x1u;
+ b >>= 1;
+ }
+ return count;
+}
+
+/* Return index (power of 2) of least significant 1 bit. */
+static int bitScan(unsigned long b) {
+ int count;
+ for (count = 0; b; count++, b >>= 1) {
+ if (b & 0x1u) return count;
+ }
+ return -1;
+}
+
+/* A bit pattern representing all poles */
+#define ALL_POLES ((1 << glhanoi->numberOfPoles) - 1)
+
+#define REMOVE_BIT(a, b) ((a) & ~(1 << (b)))
+#define ADD_BIT(a, b) ((a) | (1 << (b)))
+
static void makeMove(glhcfg *glhanoi)
{
- int fudge = glhanoi->move + 2;
- int magicNumber = magic(fudge);
+ if (glhanoi->numberOfPoles == 3) {
+ int fudge = glhanoi->move + 2;
+ int magicNumber = magic(fudge);
- glhanoi->currentDisk = pop(glhanoi, glhanoi->src);
- moveSetup(glhanoi, glhanoi->currentDisk);
- push(glhanoi, glhanoi->dst, glhanoi->currentDisk);
- fudge = fudge % 2;
- if(fudge == 1 || magicNumber) {
- swap(&glhanoi->src, &glhanoi->tmp);
- }
- if(fudge == 0 || glhanoi->magicNumber) {
- swap(&glhanoi->dst, &glhanoi->tmp);
+ glhanoi->currentDisk = pop(glhanoi, glhanoi->src);
+ moveSetup(glhanoi, glhanoi->currentDisk);
+ push(glhanoi, glhanoi->dst, glhanoi->currentDisk);
+
+ fudge = fudge % 2;
+
+ if(fudge == 1 || magicNumber) {
+ swap(&glhanoi->src, &glhanoi->tmp);
+ }
+ if(fudge == 0 || glhanoi->magicNumber) {
+ swap(&glhanoi->dst, &glhanoi->tmp);
+ }
+ glhanoi->magicNumber = magicNumber;
+ } else {
+ SubProblem sp;
+ int tmp = 0;
+
+ if (glhanoi->move == 0) {
+ /* Initialize the solution stack. Original problem:
+ move all disks from pole 0 to furthest pole,
+ using all other poles. */
+ pushMove(glhanoi, glhanoi->numberOfDisks, 0,
+ glhanoi->numberOfPoles - 1,
+ REMOVE_BIT(REMOVE_BIT(ALL_POLES, 0), glhanoi->numberOfPoles - 1));
+ }
+
+ while (!solveStackEmpty(glhanoi)) {
+ int k, numAvail;
+ sp = *popMove(glhanoi);
+
+ if (sp.nDisks == 1) {
+ /* We have a single, concrete move to do. */
+ /* moveSetup uses glhanoi->src, dst. */
+ glhanoi->src = sp.src;
+ glhanoi->dst = sp.dst;
+ glhanoi->tmp = tmp; /* Probably unnecessary */
+
+ glhanoi->currentDisk = pop(glhanoi, sp.src);
+ moveSetup(glhanoi, glhanoi->currentDisk);
+ push(glhanoi, sp.dst, glhanoi->currentDisk);
+
+ return;
+ } else {
+ /* Divide and conquer, using Frame-Stewart algorithm, until we get to base case */
+ if (sp.nDisks == 1) break;
+
+ numAvail = numBits(sp.available);
+ if (numAvail < 2) k = sp.nDisks - 1;
+ else if(numAvail >= sp.nDisks - 2) k = 1;
+ /* heuristic for optimal k: sqrt(2n) (see http://www.cs.wm.edu/~pkstoc/boca.pdf) */
+ else k = (int)(sqrt(2 * sp.nDisks));
+
+ if (k >= sp.nDisks) k = sp.nDisks - 1;
+ else if (k < 1) k = 1;
+
+ tmp = bitScan(sp.available);
+ /* fprintf(stderr, "Debug: k is %d, tmp is %d\n", k, tmp); */
+ if (tmp == -1) {
+ fprintf(stderr, "Error: n > 1 (%d) and no poles available\n",
+ sp.nDisks);
+ }
+
+ /* Push on moves in reverse order, since this is a stack. */
+ pushMove(glhanoi, k, tmp, sp.dst,
+ REMOVE_BIT(ADD_BIT(sp.available, sp.src), tmp));
+ pushMove(glhanoi, sp.nDisks - k, sp.src, sp.dst,
+ REMOVE_BIT(sp.available, tmp));
+ pushMove(glhanoi, k, sp.src, tmp,
+ REMOVE_BIT(ADD_BIT(sp.available, sp.dst), tmp));
+
+ /* Repeat until we've found a move we can make. */
+ }
+ }
}
- glhanoi->magicNumber = magicNumber;
}
static double lerp(double alpha, double start, double end)
{
d->position[0] = d->xmin;
d->position[1] = d->base0 + (d->u1 - 0.5 * g * t) * t;
+ d->position[2] = d->zmin;
d->rotation[1] = 0.0;
}
static void parafunc(GLdouble t, Disk * d)
{
- d->position[0] = d->xmin + d->ucostheta * t;
+ /* ##was: d->position[0] = d->xmin + d->ucostheta * t; */
+ d->position[0] = d->xmin + d->dx * t;
+ d->position[2] = d->zmin + d->dz * t;
d->position[1] = d->ymin + (d->usintheta - 0.5 * g * t) * t;
-
- d->rotation[1] =
- d->rotAngle * (d->position[0] - d->xmin) / (d->xmax - d->xmin);
+
+ d->rotation[1] = d->rotAngle * t / d->t2;
+ /* d->rotAngle * (d->position[0] - d->xmin) / (d->xmax - d->xmin); */
}
static void downfunc(GLdouble t, Disk * d)
{
d->position[0] = d->xmax;
d->position[1] = d->ymin + (d->u2 - 0.5 * g * t) * t;
-
+ d->position[2] = d->zmax;
+
d->rotation[1] = 0.0;
}
-static Bool computePosition(GLfloat t, Disk * d)
+#define normalizeQ(i) ((i) >= glhanoi->trailQSize ? (i) - glhanoi->trailQSize : (i))
+#define normalizeQNeg(i) ((i) < 0 ? (i) + glhanoi->trailQSize : (i))
+
+/* Add trail point at position posn at time t onto back of trail queue.
+ Removes old trails if necessary to make room. */
+static void enQTrail(glhcfg *glhanoi, GLfloat *posn)
+{
+ if (glhanoi->trailQSize && glhanoi->state != MONEY_SHOT) {
+ TrailPoint *tp = &(glhanoi->trailQ[glhanoi->trailQBack]);
+ double t = getTime();
+
+ tp->position[0] = posn[0];
+ tp->position[1] = posn[1] + glhanoi->diskHeight;
+ /* Slight jitter to prevent clashing with other trails */
+ tp->position[2] = posn[2] + (glhanoi->move % 23) * 0.01;
+ tp->startTime = t + TRAIL_START_DELAY;
+ tp->endTime = t + TRAIL_START_DELAY + glhanoi->trailDuration;
+ tp->isEnd = False;
+
+ /* Update queue back/front indices */
+ glhanoi->trailQBack = normalizeQ(glhanoi->trailQBack + 1);
+ if (glhanoi->trailQBack == glhanoi->trailQFront)
+ glhanoi->trailQFront = normalizeQ(glhanoi->trailQFront + 1);
+ }
+}
+
+/* Mark last trailpoint in queue as the end of a trail. */
+/* was: #define endTrail(glh) ((glh)->trailQ[(glh)->trailQBack].isEnd = True) */
+static void endTrail(glhcfg *glhanoi) {
+ if (glhanoi->trailQSize)
+ glhanoi->trailQ[normalizeQNeg(glhanoi->trailQBack - 1)].isEnd = True;
+}
+
+/* Update disk d's position and rotation based on time t.
+ Returns true iff move is finished. */
+static Bool computePosition(glhcfg *glhanoi, GLfloat t, Disk * d)
{
Bool finished = False;
upfunc(t, d);
} else if(t < d->t1 + d->t2) {
parafunc(t - d->t1, d);
+ enQTrail(glhanoi, d->position);
} else {
downfunc(t - d->t1 - d->t2, d);
if(d->position[1] <= d->base1) {
d->position[1] = d->base1;
finished = True;
+ endTrail(glhanoi);
}
}
return finished;
longitude += glhanoi->camera[0];
latitude += glhanoi->camera[1];
radius += glhanoi->camera[2];
+ /* FUTURE: tweak this to be smooth: */
longitude = longitude - floor(longitude);
latitude = latitude - floor(latitude);
radius = radius - floor(radius);
if(radius > 0.5) {
radius = 1.0 - radius;
}
-
+
b = glhanoi->centre[1];
c = (MIN_CAMERA_RADIUS +
radius * (MAX_CAMERA_RADIUS - MIN_CAMERA_RADIUS));
glhanoi->startTime = getTime();
}
+static Bool finishedHanoi(glhcfg *glhanoi) {
+ /* use different criteria depending on algorithm */
+ return (glhanoi->numberOfPoles == 3 ?
+ glhanoi->move >= glhanoi->numberOfMoves :
+ solveStackEmpty(glhanoi));
+}
+
static void update_glhanoi(glhcfg *glhanoi)
{
double t = getTime() - glhanoi->startTime;
break;
case MOVE_DISK:
- if(computePosition(t, glhanoi->currentDisk)) {
+ if(computePosition(glhanoi, t * glhanoi->currentDisk->speed, glhanoi->currentDisk)) {
changeState(glhanoi, MOVE_FINISHED);
}
break;
case MOVE_FINISHED:
- if(++glhanoi->move < glhanoi->numberOfMoves) {
+ ++glhanoi->move;
+ if(!finishedHanoi(glhanoi)) {
makeMove(glhanoi);
changeState(glhanoi, MOVE_DISK);
} else {
break;
case FINISHED:
- while(t < glhanoi->duration) {
+ if (t < glhanoi->duration)
break;
- }
glhanoi->src = glhanoi->olddst;
glhanoi->dst = glhanoi->oldsrc;
for(i = 0; i < glhanoi->numberOfDisks; ++i) {
continue;
}
- finished = computePosition(t - delay, &glhanoi->disk[i]);
+ finished = computePosition(glhanoi, t - delay, &glhanoi->disk[i]);
glhanoi->disk[i].rotation[1] = 0.0;
if(!finished) {
GLint lastSlice = nSlice - 1;
GLfloat radius;
GLfloat innerRadius;
- GLfloat maxRadius;
if(bottomThickness > bottomRadius) {
bottomThickness = bottomRadius;
if(topThickness < 0.0) {
topThickness = 0.0;
}
- if(topRadius >= bottomRadius) {
+/* if(topRadius >= bottomRadius) {
maxRadius = topRadius;
} else {
maxRadius = bottomRadius;
- }
+ } */
/* bottom */
y = 0.0;
outer_radius - inner_radius, height, NSLICE, NLOOPS);
}
+/* used for drawing base */
static int drawCuboid(GLfloat length, GLfloat width, GLfloat height)
{
GLfloat xmin = -length / 2.0f;
return polys;
}
+/* Set normal vector in xz plane, based on rotation around center. */
+static void setNormalV(glhcfg *glhanoi, GLfloat theta, int y1, int y2, int r1) {
+ if (y1 == y2) /* up/down */
+ glNormal3f(0.0, y1 ? 1.0 : -1.0, 0.0);
+ else if (!r1) /* inward */
+ glNormal3f(-cos(theta), 0.0, -sin(theta));
+ else /* outward */
+ glNormal3f(cos(theta), 0.0, sin(theta));
+}
+
+/* y1, r1, y2, r2 are indices into y, r, beg, end */
+static int drawBaseStrip(glhcfg *glhanoi, int y1, int r1, int y2, int r2,
+ GLfloat y[2], GLfloat r[2], GLfloat beg[2][2], GLfloat end[2][2]) {
+ int i;
+ GLfloat theta, costh, sinth, x[2], z[2];
+ GLfloat theta1 = (M_PI * 2) / (glhanoi->numberOfPoles + 1);
+
+ glBegin(GL_QUAD_STRIP);
+
+ /* beginning edge */
+ glVertex3f(beg[r1][0], y[y1], beg[r1][1]);
+ glVertex3f(beg[r2][0], y[y2], beg[r2][1]);
+ setNormalV(glhanoi, theta1, y1, y2, r1);
+
+ for (i = 1; i < glhanoi->numberOfPoles; i++) {
+ theta = theta1 * (i + 0.5);
+ costh = cos(theta);
+ sinth = sin(theta);
+ x[0] = costh * r[0];
+ x[1] = costh * r[1];
+ z[0] = sinth * r[0];
+ z[1] = sinth * r[1];
+
+ glVertex3f(x[r1], y[y1], z[r1]);
+ glVertex3f(x[r2], y[y2], z[r2]);
+
+ setNormalV(glhanoi, theta1 * (i + 1), y1, y2, r1);
+ }
+
+ /* end edge */
+ glVertex3f(end[r1][0], y[y1], end[r1][1]);
+ glVertex3f(end[r2][0], y[y2], end[r2][1]);
+ setNormalV(glhanoi, glhanoi->numberOfPoles, y1, y2, r1);
+
+ glEnd();
+ return glhanoi->numberOfPoles;
+}
+
+/* Draw base such that poles are distributed around a regular polygon. */
+static int drawRoundBase(glhcfg *glhanoi) {
+ int polys = 0;
+ GLfloat theta, sinth, costh;
+
+ /*
+ r[0] = (minimum) inner radius of base at vertices
+ r[1] = (minimum) outer radius of base at vertices
+ y[0] = bottom of base
+ y[1] = top of base */
+ GLfloat r[2], y[2];
+ /* positions of end points: beginning, end.
+ beg[0] is inner corner of beginning of base, beg[1] is outer corner.
+ beg[i][0] is x, [i][1] is z. */
+ GLfloat beg[2][2], end[2][2], begNorm, endNorm;
+ /* ratio of radius at base vertices to ratio at poles */
+ GLfloat longer = 1.0 / cos(M_PI / (glhanoi->numberOfPoles + 1));
+
+ r[0] = (glhanoi->poleDist - glhanoi->maxDiskRadius) * longer;
+ r[1] = (glhanoi->poleDist + glhanoi->maxDiskRadius) * longer;
+ y[0] = 0;
+ y[1] = glhanoi->baseHeight;
+
+ /* compute beg, end. Make the ends square. */
+ theta = M_PI * 2 / (glhanoi->numberOfPoles + 1);
+
+ costh = cos(theta);
+ sinth = sin(theta);
+ beg[0][0] = (glhanoi->poleDist - glhanoi->maxDiskRadius) * costh +
+ glhanoi->maxDiskRadius * sinth;
+ beg[1][0] = (glhanoi->poleDist + glhanoi->maxDiskRadius) * costh +
+ glhanoi->maxDiskRadius * sinth;
+ beg[0][1] = (glhanoi->poleDist - glhanoi->maxDiskRadius) * sinth -
+ glhanoi->maxDiskRadius * costh;
+ beg[1][1] = (glhanoi->poleDist + glhanoi->maxDiskRadius) * sinth -
+ glhanoi->maxDiskRadius * costh;
+ begNorm = theta - M_PI * 0.5;
+
+ theta = M_PI * 2 * glhanoi->numberOfPoles / (glhanoi->numberOfPoles + 1);
+
+ costh = cos(theta);
+ sinth = sin(theta);
+ end[0][0] = (glhanoi->poleDist - glhanoi->maxDiskRadius) * costh -
+ glhanoi->maxDiskRadius * sinth;
+ end[1][0] = (glhanoi->poleDist + glhanoi->maxDiskRadius) * costh -
+ glhanoi->maxDiskRadius * sinth;
+ end[0][1] = (glhanoi->poleDist - glhanoi->maxDiskRadius) * sinth +
+ glhanoi->maxDiskRadius * costh;
+ end[1][1] = (glhanoi->poleDist + glhanoi->maxDiskRadius) * sinth +
+ glhanoi->maxDiskRadius * costh;
+ endNorm = theta + M_PI * 0.5;
+
+ /* bottom: never seen
+ polys = drawBaseStrip(glhanoi, 0, 0, 0, 1, y, r, beg, end); */
+ /* outside edge */
+ polys += drawBaseStrip(glhanoi, 0, 1, 1, 1, y, r, beg, end);
+ /* top */
+ polys += drawBaseStrip(glhanoi, 1, 1, 1, 0, y, r, beg, end);
+ /* inside edge */
+ polys += drawBaseStrip(glhanoi, 1, 0, 0, 0, y, r, beg, end);
+
+ /* Draw ends */
+ glBegin(GL_QUADS);
+
+ glVertex3f(beg[0][0], y[1], beg[0][1]);
+ glVertex3f(beg[1][0], y[1], beg[1][1]);
+ glVertex3f(beg[1][0], y[0], beg[1][1]);
+ glVertex3f(beg[0][0], y[0], beg[0][1]);
+ glNormal3f(cos(begNorm), 0, sin(begNorm));
+
+ glVertex3f(end[0][0], y[0], end[0][1]);
+ glVertex3f(end[1][0], y[0], end[1][1]);
+ glVertex3f(end[1][0], y[1], end[1][1]);
+ glVertex3f(end[0][0], y[1], end[0][1]);
+ glNormal3f(cos(endNorm), 0, sin(endNorm));
+
+ polys += 2;
+
+ glEnd();
+
+ return polys;
+}
+
static int drawDisks(glhcfg *glhanoi)
{
int i;
glTranslatef(pos[0], pos[1], pos[2]);
if(rot[1] != 0.0) {
glTranslatef(0.0, glhanoi->diskHeight / 2.0, 0.0);
+ /* rotate around different axis depending on phi */
+ if (disk->phi != 0.0)
+ glRotatef(-disk->phi, 0.0, 1.0, 0.0);
glRotatef(rot[1], 0.0, 0.0, 1.0);
+ if (disk->phi != 0.0)
+ glRotatef(disk->phi, 0.0, 1.0, 0.0);
glTranslatef(0.0, -glhanoi->diskHeight / 2.0, 0.0);
}
glCallList(disk->displayList);
static GLfloat getDiskRadius(glhcfg *glhanoi, int i)
{
- return ((GLfloat) i + 3.0) * glhanoi->poleRadius;
+ GLfloat retVal = glhanoi->maxDiskRadius *
+ ((GLfloat) i + 3.0) / (glhanoi->numberOfDisks + 3.0);
+ return retVal;
}
static void initData(glhcfg *glhanoi)
{
- GLfloat maxDiskRadius;
int i;
+ GLfloat sinPiOverNP;
glhanoi->baseLength = BASE_LENGTH;
- glhanoi->poleRadius = glhanoi->baseLength /
- (2.0 * (3 * glhanoi->numberOfDisks + 7.0));
- maxDiskRadius = getDiskRadius(glhanoi, glhanoi->numberOfDisks);
- glhanoi->baseWidth = 2.0 * maxDiskRadius;
+ if (glhanoi->layoutLinear) {
+ glhanoi->maxDiskRadius = glhanoi->baseLength /
+ (2 * 0.95 * glhanoi->numberOfPoles);
+ } else {
+ sinPiOverNP = sin(M_PI / (glhanoi->numberOfPoles + 1));
+ glhanoi->maxDiskRadius = (sinPiOverNP * glhanoi->baseLength * 0.5 * 0.95) / (1 + sinPiOverNP);
+ }
+
+ glhanoi->poleDist = glhanoi->baseLength * 0.5 - glhanoi->maxDiskRadius;
+ glhanoi->poleRadius = glhanoi->maxDiskRadius / (glhanoi->numberOfDisks + 3.0);
+ /* fprintf(stderr, "Debug: baseL = %f, maxDiskR = %f, poleR = %f\n",
+ glhanoi->baseLength, glhanoi->maxDiskRadius, glhanoi->poleRadius); */
+ glhanoi->baseWidth = 2.0 * glhanoi->maxDiskRadius;
glhanoi->poleOffset = 2.0 * getDiskRadius(glhanoi, glhanoi->maxDiskIdx);
glhanoi->diskHeight = 2.0 * glhanoi->poleRadius;
glhanoi->baseHeight = 2.0 * glhanoi->poleRadius;
glhanoi->poleHeight = glhanoi->numberOfDisks *
glhanoi->diskHeight + glhanoi->poleRadius;
+ /* numberOfMoves only applies if numberOfPoles = 3 */
glhanoi->numberOfMoves = (1 << glhanoi->numberOfDisks) - 1;
+ /* use golden ratio */
glhanoi->boardSize = glhanoi->baseLength * 0.5 * (1.0 + sqrt(5.0));
- for(i = 0; i < 3; i++) {
- if((glhanoi->pole[i].data =
- calloc(glhanoi->numberOfDisks, sizeof(Disk *))) == NULL) {
- fprintf(stderr, "%s: out of memory creating stack %d\n",
- progname, i);
- exit(1);
- }
+ glhanoi->pole = (Pole *)calloc(glhanoi->numberOfPoles, sizeof(Pole));
+ checkAllocAndExit(!!glhanoi->pole, "poles");
+
+ for(i = 0; i < glhanoi->numberOfPoles; i++) {
+ checkAllocAndExit(
+ !!(glhanoi->pole[i].data = calloc(glhanoi->numberOfDisks, sizeof(Disk *))),
+ "disk stack");
glhanoi->pole[i].size = glhanoi->numberOfDisks;
}
- if((glhanoi->diskPos =
- calloc(glhanoi->numberOfDisks, sizeof(double))) == NULL) {
- fprintf(stderr, "%s: out of memory creating diskPos\n", progname);
- exit(1);
- }
-
+ checkAllocAndExit(
+ !!(glhanoi->diskPos = calloc(glhanoi->numberOfDisks, sizeof(double))),
+ "diskPos");
+
+ if (glhanoi->trailQSize) {
+ glhanoi->trailQ = (TrailPoint *)calloc(glhanoi->trailQSize, sizeof(TrailPoint));
+ checkAllocAndExit(!!glhanoi->trailQ, "trail queue");
+ } else glhanoi->trailQ = (TrailPoint *)NULL;
+ glhanoi->trailQFront = glhanoi->trailQBack = 0;
+
glhanoi->the_rotator = make_rotator(0.1, 0.025, 0, 1, 0.005, False);
+ /* or glhanoi->the_rotator = make_rotator(0.025, 0.025, 0.025, 0.5, 0.005, False); */
glhanoi->button_down_p = False;
glhanoi->src = glhanoi->oldsrc = 0;
glhanoi->tmp = glhanoi->oldtmp = 1;
- glhanoi->dst = glhanoi->olddst = 2;
+ glhanoi->dst = glhanoi->olddst = glhanoi->numberOfPoles - 1;
+
+ if (glhanoi->numberOfPoles > 3) {
+ glhanoi->solveStackSize = glhanoi->numberOfDisks + 2;
+ glhanoi->solveStack = (SubProblem *)calloc(glhanoi->solveStackSize, sizeof(SubProblem));
+ checkAllocAndExit(!!glhanoi->solveStack, "solving stack");
+ glhanoi->solveStackIdx = 0;
+ }
}
static void initView(glhcfg *glhanoi)
x -= floor(x); /* FIND RELATIVE X,Y,Z */
y -= floor(y); /* OF POINT IN CUBE. */
z -= floor(z);
- u = fade(x), /* COMPUTE FADE CURVES */
- v = fade(y), /* FOR EACH OF X,Y,Z. */
- w = fade(z);
- A = glhanoi->p[X] + Y, AA = glhanoi->p[A] + Z, AB = glhanoi->p[A + 1] + Z, /* HASH COORDINATES OF */
- B = glhanoi->p[X + 1] + Y, BA = glhanoi->p[B] + Z, BB = glhanoi->p[B + 1] + Z; /* THE 8 CUBE CORNERS, */
- return lerp(w, lerp(v, lerp(u, grad(glhanoi->p[AA], x, y, z), /* AND ADD */
- grad(glhanoi->p[BA], x - 1, y, z)), /* BLENDED */
- lerp(u, grad(glhanoi->p[AB], x, y - 1, z), /* RESULTS */
- grad(glhanoi->p[BB], x - 1, y - 1, z))), /* FROM 8 CORNERS */
+ u = fade(x), /* COMPUTE FADE CURVES */
+ v = fade(y), /* FOR EACH OF X,Y,Z. */
+ w = fade(z);
+ A = glhanoi->p[X] + Y;
+ AA = glhanoi->p[A] + Z;
+ AB = glhanoi->p[A + 1] + Z, /* HASH COORDINATES OF */
+ B = glhanoi->p[X + 1] + Y;
+ BA = glhanoi->p[B] + Z;
+ BB = glhanoi->p[B + 1] + Z; /* THE 8 CUBE CORNERS, */
+ return lerp(w, lerp(v, lerp(u, grad(glhanoi->p[AA], x, y, z),/* AND ADD */
+ grad(glhanoi->p[BA], x - 1, y, z)),/* BLENDED */
+ lerp(u, grad(glhanoi->p[AB], x, y - 1, z),/* RESULTS */
+ grad(glhanoi->p[BB], x - 1, y - 1, z))),/* FROM 8 CORNERS */
lerp(v, lerp(u, grad(glhanoi->p[AA + 1], x, y, z - 1), grad(glhanoi->p[BA + 1], x - 1, y, z - 1)), /* OF CUBE */
lerp(u, grad(glhanoi->p[AB + 1], x, y - 1, z - 1),
grad(glhanoi->p[BB + 1], x - 1, y - 1, z - 1))));
return textureData;
}
-static tex_col_t makeMarbleColours(void)
+static void freeTexCols(tex_col_t*p)
{
- tex_col_t marbleColours;
+ free(p->colours);
+ free(p);
+}
+
+static tex_col_t *makeMarbleColours(void)
+{
+ tex_col_t *marbleColours;
int ncols = 2;
- marbleColours.colours = calloc(sizeof(GLuint), ncols);
- marbleColours.ncols = ncols;
+ marbleColours = malloc(sizeof(tex_col_t));
+ if(marbleColours == NULL) return NULL;
+ marbleColours->colours = calloc(sizeof(GLuint), ncols);
+ if(marbleColours->colours == NULL) return NULL;
+ marbleColours->ncols = ncols;
- marbleColours.colours[0] = 0x3f3f3f3f;
- marbleColours.colours[1] = 0xffffffff;
+ marbleColours->colours[0] = 0x3f3f3f3f;
+ marbleColours->colours[1] = 0xffffffff;
return marbleColours;
}
glBindTexture(GL_TEXTURE_2D, glhanoi->textureNames[n]);
}
+/* returns 1 on failure, 0 on success */
static int makeTextures(glhcfg *glhanoi)
{
GLubyte *marbleTexture;
- tex_col_t marbleColours;
+ tex_col_t *marbleColours;
glGenTextures(N_TEXTURES, glhanoi->textureNames);
- marbleColours = makeMarbleColours();
+ if((marbleColours = makeMarbleColours()) == NULL) {
+ return 1;
+ }
if((marbleTexture =
makeTexture(glhanoi, MARBLE_TEXTURE_SIZE, MARBLE_TEXTURE_SIZE, 1,
- makeMarbleTexture, &marbleColours)) == NULL) {
+ makeMarbleTexture, marbleColours)) == NULL) {
return 1;
}
MARBLE_TEXTURE_SIZE, MARBLE_TEXTURE_SIZE, 0,
GL_RGBA, GL_UNSIGNED_BYTE, marbleTexture);
free(marbleTexture);
+ freeTexCols(marbleColours);
return 0;
}
float texIncr = 1.0 / BOARD_SQUARES;
glhanoi->floorpolys = 0;
- if((glhanoi->floorList = glGenLists(1)) == 0) {
- fprintf(stderr, "can't allocate memory for floor display list\n");
- exit(EXIT_FAILURE);
- }
+ checkAllocAndExit(!!(glhanoi->floorList = glGenLists(1)), "floor display list");
glNewList(glhanoi->floorList, GL_COMPILE);
x0 = -glhanoi->boardSize / 2.0;
tx0 = 0.0f;
glEndList();
}
-static void initTowers(glhcfg *glhanoi)
+static void initBase(glhcfg *glhanoi)
{
- if((glhanoi->baseList = glGenLists(1)) == 0) {
- fprintf(stderr, "can't allocate memory for towers display list\n");
- exit(EXIT_FAILURE);
- }
+ checkAllocAndExit(!!(glhanoi->baseList = glGenLists(1)), "tower bases display list");
+
glNewList(glhanoi->baseList, GL_COMPILE);
setMaterial(baseColor, cWhite, 50);
- glhanoi->basepolys = drawCuboid(glhanoi->baseLength, glhanoi->baseWidth,
- glhanoi->baseHeight);
+ if (glhanoi->layoutLinear) {
+ glhanoi->basepolys = drawCuboid(glhanoi->baseLength, glhanoi->baseWidth,
+ glhanoi->baseHeight);
+ } else {
+ glhanoi->basepolys = drawRoundBase(glhanoi);
+ }
glEndList();
+}
+static void initTowers(glhcfg *glhanoi)
+{
+ int i;
+
+ checkAllocAndExit(!!(glhanoi->poleList = glGenLists(1)), "poles display list\n");
- if((glhanoi->poleList = glGenLists(1)) == 0) {
- fprintf(stderr, "can't allocate memory for towers display list\n");
- exit(EXIT_FAILURE);
- }
glNewList(glhanoi->poleList, GL_COMPILE);
- glPushMatrix();
- glTranslatef(0.0f, glhanoi->baseHeight, 0.0f);
+ /* glTranslatef(-glhanoi->poleOffset * (glhanoi->numberOfPoles - 1.0f) * 0.5f, glhanoi->baseHeight, 0.0f); */
setMaterial(poleColor, cWhite, 50);
- glhanoi->polepolys = drawPole(glhanoi->poleRadius, glhanoi->poleHeight);
- glPushMatrix();
- glTranslatef(-glhanoi->poleOffset, 0.0, 0.0);
- glhanoi->polepolys += drawPole(glhanoi->poleRadius, glhanoi->poleHeight);
- glPopMatrix();
- glTranslatef(glhanoi->poleOffset, 0.0, 0.0);
- glhanoi->polepolys += drawPole(glhanoi->poleRadius, glhanoi->poleHeight);
- glPopMatrix();
+ for (i = 0; i < glhanoi->numberOfPoles; i++) {
+ GLfloat *p = glhanoi->pole[i].position;
+ GLfloat rad = (M_PI * 2.0 * (i + 1)) / (glhanoi->numberOfPoles + 1);
+
+ p[1] = glhanoi->baseHeight;
+
+ if (glhanoi->layoutLinear) {
+ /* Linear: */
+ p[0] = -glhanoi->poleOffset * ((glhanoi->numberOfPoles - 1) * 0.5f - i);
+ p[2] = 0.0f;
+ } else {
+ /* Circular layout: */
+ p[0] = cos(rad) * glhanoi->poleDist;
+ p[2] = sin(rad) * glhanoi->poleDist;
+ }
+
+ glPushMatrix();
+ glTranslatef(p[0], p[1], p[2]);
+ glhanoi->polepolys = drawPole(glhanoi->poleRadius, glhanoi->poleHeight);
+ glPopMatrix();
+
+ }
glEndList();
}
+/* Parameterized hue based on input 0.0 - 1.0. */
static double cfunc(double x)
{
#define COMP <
return (1.0 / 12.0) / (1.0 / 7.0) * x;
}
if(x < 3.0 / 7.0) {
+ /* (7x - 1) / 6 */
return (1.0 + 1.0 / 6.0) * x - 1.0 / 6.0;
}
if(x < 4.0 / 7.0) {
static void initDisks(glhcfg *glhanoi)
{
int i;
- if((glhanoi->disk =
- (Disk *) calloc(glhanoi->numberOfDisks, sizeof(Disk))) == NULL) {
- perror("initDisks");
- exit(EXIT_FAILURE);
- }
+ glhanoi->disk = (Disk *) calloc(glhanoi->numberOfDisks, sizeof(Disk));
+ checkAllocAndExit(!!glhanoi->disk, "disks");
for(i = glhanoi->maxDiskIdx; i >= 0; i--) {
GLfloat height = (GLfloat) (glhanoi->maxDiskIdx - i);
Disk *disk = &glhanoi->disk[i];
disk->id = i;
- disk->position[0] = -glhanoi->poleOffset;
+ disk->position[0] = glhanoi->pole[0].position[0]; /* -glhanoi->poleOffset * (glhanoi->numberOfPoles - 1.0f) * 0.5; */
disk->position[1] = glhanoi->diskHeight * height;
- disk->position[2] = 0.0;
+ disk->position[2] = glhanoi->pole[0].position[2];
disk->rotation[0] = 0.0;
disk->rotation[1] = 0.0;
disk->rotation[2] = 0.0;
disk->polys = 0;
+ /* make smaller disks move faster */
+ disk->speed = lerp(((double)glhanoi->numberOfDisks - i) / glhanoi->numberOfDisks,
+ 1.0, glhanoi->speed);
+ /* fprintf(stderr, "disk id: %d, alpha: %0.2f, speed: %0.2f\n", disk->id,
+ ((double)(glhanoi->maxDiskIdx - i)) / glhanoi->numberOfDisks, disk->speed); */
+
color[0] = diskColor;
color[1] = 1.0f;
color[2] = 1.0f;
HSVtoRGBv(color, color);
- if((disk->displayList = glGenLists(1)) == 0) {
- fprintf(stderr,
- "can't allocate memory for disk %d display list\n", i);
- exit(EXIT_FAILURE);
- }
+ checkAllocAndExit(!!(disk->displayList = glGenLists(1)), "disk display list");
glNewList(disk->displayList, GL_COMPILE);
setMaterial(color, cWhite, 100.0);
disk->polys += drawDisk3D(glhanoi->poleRadius,
getDiskRadius(glhanoi, i),
glhanoi->diskHeight);
+ /*fprintf(stderr, "Debug: disk %d has radius %f\n", i,
+ getDiskRadius(glhanoi, i)); */
glEndList();
}
for(i = glhanoi->maxDiskIdx; i >= 0; --i) {
return glhanoi->basepolys + glhanoi->polepolys;
}
+static int drawTrails1(glhcfg *glhanoi, double t, double thickness, double alpha) {
+ int i, prev = -1, lines = 0;
+ Bool fresh = False;
+ GLfloat trailDurInv = 1.0f / glhanoi->trailDuration;
+
+ glLineWidth(thickness);
+
+ glBegin(GL_LINES);
+
+ for (i = glhanoi->trailQFront;
+ i != glhanoi->trailQBack;
+ i = normalizeQ(i + 1)) {
+ TrailPoint *tqi = &(glhanoi->trailQ[i]);
+
+ if (!fresh && t > tqi->endTime) {
+ glhanoi->trailQFront = normalizeQ(i + 1);
+ } else {
+ if (tqi->startTime > t) break;
+ /* Found trails that haven't timed out. */
+ if (!fresh) fresh = True;
+ if (prev > -1) {
+ /* Fade to invisible with age */
+ trailColor[3] = alpha * (tqi->endTime - t) * trailDurInv;
+ /* Can't use setMaterial(trailColor, cBlack, 0) because our color needs an alpha value. */
+ glColor4fv(trailColor);
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, trailColor);
+ /* FUTURE: to really do this right, trails should be drawn in back-to-front
+ order, so that blending is done correctly.
+ Currently it looks poor when a faded trail is in front of, or coincident with,
+ a bright trail but is drawn first.
+ I think for now it's good enough to recommend shorter trails so they
+ never/rarely overlap.
+ A jitter per trail arc would also mitigate this problem, to a lesser degree. */
+ glVertex3fv(glhanoi->trailQ[prev].position);
+ glVertex3fv(glhanoi->trailQ[i].position);
+ lines++;
+ }
+ if (glhanoi->trailQ[i].isEnd)
+ prev = -1;
+ else
+ prev = i;
+ }
+ }
+
+ glEnd();
+
+ return lines;
+}
+
+static int drawTrails(glhcfg *glhanoi) {
+ int lines = 0;
+ double t = getTime();
+
+ glEnable (GL_BLEND);
+ glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glMaterialfv(GL_FRONT, GL_SPECULAR, cBlack);
+ glMateriali(GL_FRONT, GL_SHININESS, 0);
+
+ /* Draw them twice, with different widths and opacities, to make them smoother. */
+ lines = drawTrails1(glhanoi, t, 1.0, 0.75);
+ lines += drawTrails1(glhanoi, t, 2.5, 0.5);
+
+ glDisable (GL_BLEND);
+
+ /* fprintf(stderr, "Drew trails: %d lines\n", lines); */
+ return lines;
+}
+
/* Window management, etc
*/
ENTRYPOINT void reshape_glhanoi(ModeInfo * mi, int width, int height)
{
+ glhcfg *glhanoi = &glhanoi_cfg[MI_SCREEN(mi)];
+ glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(glhanoi->glx_context));
+
glViewport(0, 0, (GLint) width, (GLint) height);
glMatrixMode(GL_PROJECTION);
glClear(GL_COLOR_BUFFER_BIT);
}
+static void free_glhanoi(ModeInfo * mi);
+
ENTRYPOINT void init_glhanoi(ModeInfo * mi)
{
glhcfg *glhanoi;
- if(!glhanoi_cfg) {
- glhanoi_cfg =
- (glhcfg *) calloc(MI_NUM_SCREENS(mi), sizeof(glhcfg));
- if(!glhanoi_cfg) {
- fprintf(stderr, "%s: out of memory creating configs\n",
- progname);
- exit(1);
- }
- }
+ MI_INIT(mi, glhanoi_cfg, free_glhanoi);
glhanoi = &glhanoi_cfg[MI_SCREEN(mi)];
glhanoi->glx_context = init_GL(mi);
glhanoi->numberOfDisks = MI_BATCHCOUNT(mi);
-
+
if (glhanoi->numberOfDisks <= 1)
glhanoi->numberOfDisks = 3 + (int) BELLRAND(9);
- /* magicnumber is a bitfield, so we can't have more than 31 discs
- on a system with 4-byte ints. */
- if (glhanoi->numberOfDisks >= 8 * sizeof(int))
- glhanoi->numberOfDisks = (8 * sizeof(int)) - 1;
+ /* magicnumber is a bitfield, so we can't have more than 31 discs
+ on a system with 4-byte ints. */
+ if (glhanoi->numberOfDisks >= 8 * sizeof(int))
+ glhanoi->numberOfDisks = (8 * sizeof(int)) - 1;
glhanoi->maxDiskIdx = glhanoi->numberOfDisks - 1;
+
+ glhanoi->numberOfPoles = get_integer_resource(MI_DISPLAY(mi), "poles", "Integer");
+ /* Set a number of poles from 3 to numberOfDisks + 1, biased toward lower values,
+ with probability decreasing linearly. */
+ if (glhanoi->numberOfPoles <= 2)
+ glhanoi->numberOfPoles = 3 +
+ (int)((1 - sqrt(frand(1.0))) * (glhanoi->numberOfDisks - 1));
+
glhanoi->wire = MI_IS_WIREFRAME(mi);
+
+# ifdef HAVE_JWZGLES /* #### glPolygonMode other than GL_FILL unimplemented */
+ glhanoi->wire = 0;
+# endif
+
glhanoi->light = light;
glhanoi->fog = fog;
glhanoi->texture = texture;
-
+ glhanoi->speed = speed;
+ glhanoi->trailDuration = trails;
+ /* set trailQSize based on 60 fps (a maximum, more or less) */
+ /* FUTURE: Should clamp framerate to 60 fps? See flurry.c's draw_flurry().
+ The only bad effect if we don't is that trail-ends could
+ show "unnatural" pauses at high fps. */
+ glhanoi->trailQSize = (int)(trails * 60.0);
+
reshape_glhanoi(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
if(glhanoi->wire) {
}
initLights(!glhanoi->wire && glhanoi->light);
- if(makeTextures(glhanoi) != 0) {
- fprintf(stderr, "can't allocate memory for marble texture\n");
- exit(EXIT_FAILURE);
- }
+ checkAllocAndExit(!makeTextures(glhanoi), "textures\n");
+ /* Choose linear or circular layout. Could make this a user option. */
+ glhanoi->layoutLinear = (glhanoi->numberOfPoles == 3);
+
initData(glhanoi);
initView(glhanoi);
initFloor(glhanoi);
+ initBase(glhanoi);
initTowers(glhanoi);
initDisks(glhanoi);
glEnable(GL_FOG);
}
-
glhanoi->duration = START_DURATION;
changeState(glhanoi, START);
}
ENTRYPOINT void draw_glhanoi(ModeInfo * mi)
{
- glhcfg *glhanoi = &glhanoi_cfg[MI_SCREEN(mi)];
+ glhcfg *glhanoi = &glhanoi_cfg[MI_SCREEN(mi)];
Display *dpy = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
if(!glhanoi->glx_context)
return;
- glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(glhanoi->glx_context));
+ glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(glhanoi->glx_context));
glPolygonMode(GL_FRONT, glhanoi->wire ? GL_LINE : GL_FILL);
mi->polygon_count = 0;
glLoadIdentity();
+ glRotatef(current_device_rotation(), 0, 0, 1);
update_glhanoi(glhanoi);
updateView(glhanoi);
+# ifdef HAVE_MOBILE /* Keep it the same relative size when rotated. */
+ {
+ GLfloat h = MI_HEIGHT(mi) / (GLfloat) MI_WIDTH(mi);
+ int o = (int) current_device_rotation();
+ if (o != 0 && o != 180 && o != -180)
+ glScalef (1/h, 1/h, 1/h);
+ }
+# endif
+
if(!glhanoi->wire && glhanoi->texture) {
glEnable(GL_TEXTURE_2D);
}
mi->polygon_count += drawTowers(glhanoi);
mi->polygon_count += drawDisks(glhanoi);
+ if (glhanoi->trailQSize) {
+ /* No polygons, just lines. So ignore the return count. */
+ (void)drawTrails(glhanoi);
+ }
+
if(mi->fps_p) {
do_fps(mi);
}
{
glhcfg *glhanoi = &glhanoi_cfg[MI_SCREEN(mi)];
+ /* #### this is all wrong on iOS -- should be using gltrackball. */
+
if(event->xany.type == ButtonPress && event->xbutton.button == Button1) {
glhanoi->button_down_p = True;
glhanoi->drag_x = event->xbutton.x;
return True;
}
+#if 0 /* #### doesn't work */
+ else if (screenhack_event_helper (MI_DISPLAY(mi), MI_WINDOW(mi), event))
+ {
+ changeState(glhanoi, START);
+ return True;
+ }
+#endif
return False;
}
-ENTRYPOINT void release_glhanoi(ModeInfo * mi)
+static void free_glhanoi(ModeInfo * mi)
{
- if(glhanoi_cfg != NULL) {
- int screen;
- for(screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
- int i;
- int j;
- glhcfg *glh = &glhanoi_cfg[screen];
- glDeleteLists(glh->floorList, 1);
- glDeleteLists(glh->baseList, 1);
- glDeleteLists(glh->poleList, 1);
- glDeleteLists(glh->textureNames[0], 2);
- for(j = 0; j < glh->numberOfDisks; ++j) {
- glDeleteLists(glh->disk[j].displayList, 1);
- }
- free(glh->disk);
- for(i = 0; i < 3; i++) {
- if(glh->pole[i].data != NULL) {
- free(glh->pole[i].data);
- }
+ int i;
+ int j;
+ glhcfg *glh = &glhanoi_cfg[MI_SCREEN(mi)];
+ if (glh->glx_context) {
+ glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(glh->glx_context));
+ glDeleteLists(glh->floorList, 1);
+ glDeleteLists(glh->baseList, 1);
+ glDeleteLists(glh->poleList, 1);
+ glDeleteLists(glh->textureNames[0], 2);
+ for(j = 0; j < glh->numberOfDisks; ++j) {
+ glDeleteLists(glh->disk[j].displayList, 1);
+ }
+ free(glh->disk);
+ for(i = 0; i < glh->numberOfPoles; i++) {
+ if(glh->pole[i].data != NULL) {
+ free(glh->pole[i].data);
}
}
}
- free(glhanoi_cfg);
- glhanoi_cfg = NULL;
}
XSCREENSAVER_MODULE ("GLHanoi", glhanoi)
projects / xscreensaver / blobdiff