Original 5.40

1 files changed, 1468 insertions, 0 deletions

diff --git a/hacks/glx/crackberg.c b/hacks/glx/crackberg.c
new file mode 100644
index 0000000..74c6915
--- /dev/null
+++ b/hacks/glx/crackberg.c
@@ -0,0 +1,1468 @@
+/***************************
+ ** crackberg; Matus Telgarsky [ catachresis@cmu.edu ] 2005 
+ ** */
+#ifndef HAVE_JWXYZ
+# define XK_MISCELLANY
+# include <X11/keysymdef.h>
+#endif
+
+#define DEFAULTS    "*delay:        20000       \n" \
+                    "*showFPS:      False       \n" \
+		    "*wireframe:    False       \n" \
+
+# define release_crackberg 0
+#undef countof
+#define countof(x) (sizeof((x))/sizeof((*x)))
+
+#include "xlockmore.h"
+#ifdef USE_GL /* whole file */
+
+#define DEF_NSUBDIVS   "4"
+#define DEF_BORING     "False"
+#define DEF_CRACK      "True"
+#define DEF_WATER      "True"
+#define DEF_FLAT       "True"
+#define DEF_COLOR      "random"
+#define DEF_LIT        "True"
+#define DEF_VISIBILITY "0.6"
+#define DEF_LETTERBOX  "False"
+
+
+/***************************
+ ** macros
+ ** */
+
+#define M_RAD7_4        0.661437827766148
+#define M_SQRT3_2       0.866025403784439
+#define M_PI_180        0.0174532925199433
+#define M_180_PI        57.2957795130823
+#define MSPEED_SCALE    1.1
+#define AVE3(a,b,c)     ( ((a) + (b) + (c)) / 3.0 )
+#define MAX_ZDELTA      0.35
+#define DISPLACE(h,d)   (h+(random()/(double)RAND_MAX-0.5)*2*MAX_ZDELTA/(1<<d))
+#define MEAN(x,y)       ( ((x) + (y)) / 2.0 )
+#define TCOORD(x,y)     (cberg->heights[(cberg->epoints * (y) - ((y)-1)*(y)/2 + (x))])
+#define sNCOORD(x,y,p)  (cberg->norms[3 * (cberg->epoints * (y) - ((y)-1)*(y)/2 + (x)) + (p)])
+#define SET_sNCOORD(x,y, down, a,b,c,d,e,f)   \
+    sNCOORD(x,y,0) = AVE3(a-d, 0.5 * (b-e), -0.5 * (c-f)); \
+    sNCOORD(x,y,1) = ((down) ? -1 : +1) * AVE3(0.0, M_SQRT3_2 * (b-e), M_SQRT3_2 * (c-f)); \
+    sNCOORD(x,y,2) = (2*dx)
+#define fNCOORD(x,y,w,p)  \
+    (cberg->norms[3 * (2*(y)*cberg->epoints-((y)+1)*((y)+1) + 1 + 2 * ((x)-1) + (w)) + (p)])
+#define SET_fNCOORDa(x,y, down, dz00,dz01) \
+    fNCOORD(x,y,0,0) = (down) * (dy) * (dz01); \
+    fNCOORD(x,y,0,1) = (down) * ((dz01) * (dx) / 2 - (dx) * (dz00)); \
+    fNCOORD(x,y,0,2) = (down) * (dx) * (dy)
+#define SET_fNCOORDb(x,y, down, dz10,dz11) \
+    fNCOORD(x,y,1,0) = (down) * (dy) * (dz10); \
+    fNCOORD(x,y,1,1) = (down) * ((dz11) * (dx) - (dx) * (dz10) / 2); \
+    fNCOORD(x,y,1,2) = (down) * (dx) * (dy)
+
+
+/***************************
+ ** types
+ ** */
+
+
+typedef struct _cberg_state cberg_state;
+typedef struct _Trile Trile;
+
+typedef struct {
+    void (*init)(Trile *);
+    void (*free)(Trile *);
+    void (*draw)(Trile *);
+    void (*init_iter)(Trile *, cberg_state *);
+    void (*dying_iter)(Trile *, cberg_state *);
+} Morph;
+
+typedef struct {
+    char *id;
+    void (*land)(cberg_state *, double);
+    void (*water)(cberg_state *, double);
+    double bg[4];
+} Color;
+
+enum { TRILE_NEW, TRILE_INIT, TRILE_STABLE, TRILE_DYING, TRILE_DELETE };
+
+struct _Trile {
+    int x,y; /*center coords; points up if (x+y)%2 == 0, else down*/
+    short state;
+    short visible;
+    double *l,*r,*v; /*only edges need saving*/
+    GLuint call_list;
+
+    void *morph_data;
+    const Morph *morph;
+
+    struct _Trile *left, *right, *parent; /* for bst, NOT spatial */
+    struct _Trile *next_free; /* for memory allocation */
+};
+
+enum { MOTION_AUTO = 0, MOTION_MANUAL = 1, MOTION_LROT= 2,    MOTION_RROT = 4,
+       MOTION_FORW = 8,   MOTION_BACK = 16,  MOTION_DEC = 32, MOTION_INC = 64,
+       MOTION_LEFT = 128, MOTION_RIGHT = 256 };
+
+struct _cberg_state {
+    GLXContext *glx_context;
+    Trile *trile_head;
+    
+    double x,y,z, yaw,roll,pitch, dx,dy,dz, dyaw,droll,dpitch, elapsed;
+    double prev_frame;
+    int motion_state;
+    double mspeed;
+
+    double fovy, aspect, zNear, zFar;
+
+    const Color *color;
+
+    int count;
+
+    unsigned int epoints, /*number of points to one edge*/
+                 tpoints, /*number points total*/
+                 ntris,   /*number triangles per trile*/
+                 tnorms;  /*number of normals*/
+
+    double *heights, *norms;
+    Trile *free_head; /* for trile_[alloc|free] */
+
+    double draw_elapsed;
+
+    double dx0;
+
+    double vs0r,vs0g,vs0b, vs1r, vs1g, vs1b,
+           vf0r,vf0g,vf0b, vf1r, vf1g, vf1b;
+
+    Bool button_down_p;
+    int mouse_x, mouse_y;
+    struct timeval paused;
+};
+
+
+
+/***************************
+ ** globals
+ ** */
+
+static unsigned int nsubdivs;
+static Bool crack, boring, do_water, flat, lit, letterbox;
+static float visibility;
+static char *color;
+
+static cberg_state *cbergs = NULL;
+
+static XrmOptionDescRec opts[] = {
+  {"-nsubdivs",   ".nsubdivs",   XrmoptionSepArg, 0},
+  {"-boring",     ".boring",     XrmoptionNoArg,  "True"},
+  {"-crack",      ".crack",      XrmoptionNoArg,  "True"},
+  {"-no-crack",   ".crack",      XrmoptionNoArg,  "False"},
+  {"-water",      ".water",      XrmoptionNoArg,  "True"},
+  {"-no-water",   ".water",      XrmoptionNoArg,  "False"},
+  {"-flat",       ".flat",       XrmoptionNoArg,  "True"},
+  {"-no-flat",    ".flat",       XrmoptionNoArg,  "False"},
+  {"-color",      ".color",      XrmoptionSepArg, 0},
+  {"-lit",        ".lit",        XrmoptionNoArg,  "True"},
+  {"-no-lit",     ".lit",        XrmoptionNoArg,  "False"},
+  {"-visibility", ".visibility", XrmoptionSepArg, 0},
+  {"-letterbox",  ".letterbox",  XrmoptionNoArg,  "True"}
+};
+
+static argtype vars[] = {
+  {&nsubdivs,   "nsubdivs",   "nsubdivs",   DEF_NSUBDIVS,   t_Int},
+  {&boring,     "boring",     "boring",     DEF_BORING,     t_Bool},
+  {&crack,      "crack",      "crack",      DEF_CRACK,      t_Bool},
+  {&do_water,   "water",      "water",      DEF_WATER,      t_Bool},
+  {&flat,       "flat",       "flat",       DEF_FLAT,       t_Bool},
+  {&color,      "color",      "color",      DEF_COLOR,      t_String},
+  {&lit,        "lit",        "lit",        DEF_LIT,        t_Bool},
+  {&visibility, "visibility", "visibility", DEF_VISIBILITY, t_Float},
+  {&letterbox,  "letterbox",  "letterbox",  DEF_LETTERBOX,  t_Bool}
+};
+
+ENTRYPOINT ModeSpecOpt crackberg_opts = {countof(opts), opts, countof(vars), vars, NULL};
+
+
+/***************************
+ ** Trile functions. 
+ **  first come all are regular trile functions 
+ ** */
+
+
+/* forward decls for trile_new */
+static Trile *triles_find(Trile *tr, int x, int y);
+static Trile *trile_alloc(cberg_state *cberg);
+static const Morph *select_morph(void);
+static const Color *select_color(cberg_state *);
+
+static void trile_calc_sides(cberg_state *cberg, 
+                             Trile *new, int x, int y, Trile *root)
+{
+    unsigned int i,j,k; 
+    int dv = ( (x + y) % 2 ? +1 : -1); /* we are pointing down or up*/
+    Trile *l, *r, *v; /* v_ertical */
+
+
+    if (root) {
+        l = triles_find(root, x-1, y);
+        r = triles_find(root, x+1, y);  
+        v = triles_find(root, x,y+dv); 
+    } else
+        l = r = v = NULL;
+
+    if (v) {
+        for (i = 0; i != cberg->epoints; ++i)
+            new->v[i] = v->v[i];
+    } else {
+        if (l)          new->v[0] = l->l[0];
+        else if (!root) new->v[0] = DISPLACE(0,0);
+        else { 
+            Trile *tr; /* all of these tests needed.. */
+            if ( (tr = triles_find(root, x-1, y + dv)) )
+                new->v[0] = tr->l[0];
+            else if ( (tr = triles_find(root, x-2, y)) )
+                new->v[0] = tr->r[0];
+            else if ( (tr = triles_find(root, x-2, y + dv)) )
+                new->v[0] = tr->r[0];
+            else
+                new->v[0] = DISPLACE(0,0);
+        }
+
+        if (r)          new->v[cberg->epoints-1] = r->l[0];
+        else if (!root) new->v[cberg->epoints-1] = DISPLACE(0,0);
+        else {
+            Trile *tr;
+            if ( (tr = triles_find(root, x+1, y + dv)) )
+                new->v[cberg->epoints-1] = tr->l[0];
+            else if ( (tr = triles_find(root, x+2, y)) )
+                new->v[cberg->epoints-1] = tr->v[0];
+            else if ( (tr = triles_find(root, x+2, y + dv)) )
+                new->v[cberg->epoints-1] = tr->v[0];
+            else
+                new->v[cberg->epoints-1] = DISPLACE(0,0);
+        }
+
+        for (i = ((1 << nsubdivs) >> 1), k =1; i; i >>= 1, ++k)
+            for (j = i; j < cberg->epoints; j += i * 2)
+                new->v[j] = DISPLACE(MEAN(new->v[j-i], new->v[j+i]), k);
+    }
+        
+    if (l) {
+        for (i = 0; i != cberg->epoints; ++i)
+            new->l[i] = l->r[i];
+    } else {
+        if (r)          new->l[0] = r->v[0];
+        else if (!root) new->l[0] = DISPLACE(0,0);
+        else {
+            Trile *tr;
+            if ( (tr = triles_find(root, x-1, y-dv)) )
+                new->l[0] = tr->r[0];
+            else if ( (tr = triles_find(root, x+1, y-dv)) )
+                new->l[0] = tr->v[0];
+            else if ( (tr = triles_find(root, x, y-dv)) )
+                new->l[0] = tr->l[0];
+            else 
+                new->l[0] = DISPLACE(0,0);
+        }
+
+        new->l[cberg->epoints - 1] = new->v[0];
+
+        for (i = ((1 << nsubdivs) >> 1), k =1; i; i >>= 1, ++k)
+            for (j = i; j < cberg->epoints; j += i * 2)
+                new->l[j] = DISPLACE(MEAN(new->l[j-i], new->l[j+i]), k);
+    }
+
+    if (r) {
+        for (i = 0; i != cberg->epoints; ++i)
+            new->r[i] = r->l[i];
+    } else {
+        new->r[0] = new->v[cberg->epoints - 1];
+        new->r[cberg->epoints - 1] = new->l[0];
+
+        for (i = ((1 << nsubdivs) >> 1), k =1; i; i >>= 1, ++k)
+            for (j = i; j < cberg->epoints; j += i * 2)
+                new->r[j] = DISPLACE(MEAN(new->r[j-i], new->r[j+i]), k);
+    }
+}
+
+static void trile_calc_heights(cberg_state *cberg, Trile *new)
+{
+    unsigned int i, j, k, h;
+
+    for (i = 0; i < cberg->epoints - 1; ++i) { /* copy in sides */
+        TCOORD(i,0) = new->v[i];
+        TCOORD(cberg->epoints - 1 - i, i) = new->r[i];
+        TCOORD(0, cberg->epoints - 1 - i) = new->l[i];
+    }
+
+    for (i = ((1 << nsubdivs) >> 2), k =1; i; i >>= 1, ++k)
+        for (j = 1; j < (1 << k); ++j)
+            for (h = 1; h <= (1<<k) - j; ++h) {
+                TCOORD( i*(2*h - 1), i*(2*j - 1) ) = /*rights*/
+                  DISPLACE(MEAN(TCOORD( i*(2*h - 2), i*(2*j + 0) ),
+                                TCOORD( i*(2*h + 0), i*(2*j - 2) )), k);
+
+                TCOORD( i*(2*h + 0), i*(2*j - 1) ) = /*lefts*/
+                  DISPLACE(MEAN(TCOORD( i*(2*h + 0), i*(2*j - 2) ),
+                                TCOORD( i*(2*h + 0), i*(2*j + 0) )), k);
+
+                TCOORD( i*(2*h - 1), i*(2*j + 0) ) = /*verts*/
+                  DISPLACE(MEAN(TCOORD( i*(2*h - 2), i*(2*j + 0) ),
+                                TCOORD( i*(2*h + 0), i*(2*j + 0) )), k);
+            }
+}
+
+static void trile_calc_flat_norms(cberg_state *cberg, Trile *new)
+{
+    unsigned int x, y;
+    int down = (((new->x + new->y) % 2) ? -1 : +1);
+    double dz00,dz01,dz10,dz11, a,b,c,d;
+    double dy = down * M_SQRT3_2 / (1 << nsubdivs);
+    double dx = cberg->dx0;
+
+    for (y = 0; y < cberg->epoints - 1; ++y) {
+        a = TCOORD(0,y);
+        b = TCOORD(0,y+1);
+        for (x = 1; x < cberg->epoints - 1 - y; ++x) {
+            c = TCOORD(x,y);
+            d = TCOORD(x,y+1);
+
+            dz00 = b-c;
+            dz01 = a-c;
+            dz10 = b-d;
+            dz11 = c-d;
+            
+            SET_fNCOORDa(x,y, down, dz00,dz01);
+            SET_fNCOORDb(x,y, down, dz10,dz11);
+
+            a = c;
+            b = d;
+        }
+
+        c = TCOORD(x,y);
+        dz00 = b-c;
+        dz01 = a-c;
+        SET_fNCOORDa(x,y, down, dz00, dz01);
+    }
+}
+
+static void trile_calc_smooth_norms(cberg_state *cberg, Trile *new)
+{
+    unsigned int i,j, down = (new->x + new->y) % 2;
+    double prev, cur, next;
+    double dx = cberg->dx0;
+
+    /** corners -- assume level (bah) **/
+    cur = TCOORD(0,0);
+    SET_sNCOORD(0,0, down,
+        cur,cur,TCOORD(0,1),TCOORD(1,0),cur,cur);
+    cur = TCOORD(cberg->epoints-1,0);
+    SET_sNCOORD(cberg->epoints-1,0, down,
+        TCOORD(cberg->epoints-2,0),TCOORD(cberg->epoints-2,1),cur,cur,cur,cur);
+    cur = TCOORD(0,cberg->epoints-1);
+    SET_sNCOORD(0,cberg->epoints-1, down,
+        cur,cur,cur,cur,TCOORD(1,cberg->epoints-2),TCOORD(0,cberg->epoints-2));
+
+
+    /** sides **/
+    /* vert */
+    prev = TCOORD(0,0);
+    cur = TCOORD(1,0);
+    for (i = 1; i < cberg->epoints - 1; ++i) {
+        next = TCOORD(i+1,0);
+        SET_sNCOORD(i,0, down, prev,TCOORD(i-1,1),TCOORD(i,1), next,cur,cur);
+        prev = cur;
+        cur = next;
+    }
+
+    /* right */
+    prev = TCOORD(cberg->epoints-1,0);
+    cur = TCOORD(cberg->epoints-2,0);
+    for (i = 1; i < cberg->epoints - 1; ++i) {
+        next = TCOORD(cberg->epoints-i-2,i+1);
+        SET_sNCOORD(cberg->epoints-i-1,i, down, TCOORD(cberg->epoints-i-2,i),next,cur,
+                                        cur,prev,TCOORD(cberg->epoints-i-1,i-1));
+        prev = cur;
+        cur = next;
+    }
+        
+    /* left */
+    prev = TCOORD(0,0);
+    cur = TCOORD(0,1);
+    for (i = 1; i < cberg->epoints - 1; ++i) {
+        next = TCOORD(0,i+1);
+        SET_sNCOORD(0,i, down, cur,cur,next,TCOORD(1,i),TCOORD(1,i-1),prev);
+        prev = cur;
+        cur = next;
+    }
+
+
+    /** fill in **/
+    for (i = 1; i < cberg->epoints - 2; ++i) {
+        prev = TCOORD(0,i);
+        cur = TCOORD(1,i);
+        for (j = 1; j < cberg->epoints - i - 1; ++j) {
+            next = TCOORD(j+1,i);
+            SET_sNCOORD(j,i, down, prev,TCOORD(j-1,i+1),TCOORD(j,i+1),
+                            next,TCOORD(j+1,i-1),TCOORD(j,i-1));
+            prev = cur;
+            cur = next;
+        }
+    }
+}
+
+static inline void trile_light(cberg_state *cberg, 
+                               unsigned int x, unsigned int y, 
+                               unsigned int which)
+{
+    if (flat) {
+        if (x) {
+            glNormal3d(fNCOORD(x,y,which,0),
+                       fNCOORD(x,y,which,1),
+                       fNCOORD(x,y,which,2));
+        } else { /* I get mesa errors and bizarre glitches without this!! */
+            glNormal3d(fNCOORD(1,y,0,0),
+                       fNCOORD(1,y,0,1),
+                       fNCOORD(1,y,0,2));
+        }
+    } else {
+        glNormal3d(sNCOORD(x,y+which,0),
+                   sNCOORD(x,y+which,1),
+                   sNCOORD(x,y+which,2));
+    }
+}
+
+static inline void trile_draw_vertex(cberg_state *cberg, unsigned int ix,
+    unsigned int iy, unsigned int which, double x,double y,
+    double zcur, double z1, double z2)
+{
+    glColor3d(0.0, 0.0, 0.0); /* don't ask. my card breaks otherwise. */
+    
+    if (do_water && zcur <= 0.0) {
+        cberg->color->water(cberg, zcur); /* XXX use average-of-3 for color when flat?*/
+        if (lit) glNormal3d(0.0,0.0,1.0);
+        glVertex3d(x, y, 0.0); 
+    } else {
+        cberg->color->land(cberg, zcur);
+        if (lit) trile_light(cberg,ix,iy,which);
+        glVertex3d(x, y, zcur);
+    }
+}
+
+static void trile_render(cberg_state *cberg, Trile *new)
+{
+    double cornerx = 0.5 * new->x - 0.5, cornery;
+    double dy = M_SQRT3_2 / (1 << nsubdivs);
+    double z0,z1,z2;
+    int x,y;
+
+    new->call_list = glGenLists(1);
+    glNewList(new->call_list, GL_COMPILE);
+
+        if ((new->x + new->y) % 2) { /*point down*/
+            cornery = (new->y + 0.5)*M_SQRT3_2;
+            glFrontFace(GL_CW);
+            dy = -dy;
+        } else
+            cornery = (new->y - 0.5) * M_SQRT3_2;
+
+        for (y = 0; y < cberg->epoints - 1; ++y) {
+            double dx = cberg->dx0;
+            glBegin(GL_TRIANGLE_STRIP);
+                /* first three points all part of the same triangle.. */
+                z0 = TCOORD(0,y);
+                z1 = TCOORD(0,y+1);
+                z2 = TCOORD(1,y);
+                trile_draw_vertex(cberg, 0,y,0,
+                  cornerx,cornery, z0, z1, z2);
+                trile_draw_vertex(cberg, 0,y,1,
+                  cornerx+0.5*dx,cornery+dy, z1, z0, z2);
+
+                for (x = 1; x < cberg->epoints - 1 - y; ++x) {
+                    trile_draw_vertex(cberg, x,y,0,
+                      cornerx+x*dx,cornery, z2, z1, z0);
+
+                    z0 = TCOORD(x, y+1);
+
+                    trile_draw_vertex(cberg, x,y,1,
+                      cornerx+(x+0.5)*dx,cornery+dy, z0, z2, z1);
+
+                    z1 = z0;
+                    z0 = z2;
+                    z2 = TCOORD(x+1,y);
+                }
+                trile_draw_vertex(cberg, x,y,0,
+                  cornerx + x*dx, cornery, z2, z1, z0);
+            glEnd();
+
+            cornerx += dx/2;
+            cornery += dy;
+        }
+
+        if ((new->x + new->y) % 2) /*point down*/
+            glFrontFace(GL_CCW);
+    glEndList();
+}
+
+static Trile *trile_new(cberg_state *cberg, int x,int y,Trile *parent,Trile *root)
+{
+    Trile *new;
+
+    new = trile_alloc(cberg);
+
+    new->x = x;
+    new->y = y;
+    new->state = TRILE_NEW;
+    new->parent = parent;
+    new->left = new->right = NULL;
+    new->visible = 1;
+
+    new->morph = select_morph();
+    new->morph->init(new);
+
+    trile_calc_sides(cberg, new, x, y, root);
+    trile_calc_heights(cberg, new);
+
+    if (lit) {
+        if (flat)   trile_calc_flat_norms(cberg, new);
+        else        trile_calc_smooth_norms(cberg, new);
+    }
+
+    trile_render(cberg, new);
+    return new;
+}
+
+static Trile *trile_alloc(cberg_state *cberg)
+{
+    Trile *new;
+
+    if (cberg->free_head) {
+        new = cberg->free_head;
+        cberg->free_head = cberg->free_head->next_free;
+    } else {
+        ++cberg->count;
+        if (!(new = malloc(sizeof(Trile)))
+         || !(new->l = (double *) malloc(sizeof(double) * cberg->epoints * 3))) {
+            perror(progname);
+            exit(1);
+        }
+        new->r = new->l + cberg->epoints;
+        new->v = new->r + cberg->epoints;
+#ifdef DEBUG
+        printf("needed to alloc; [%d]\n", cberg->count);
+#endif
+    }
+    return new;
+}
+
+static void trile_free(cberg_state *cberg, Trile *tr)
+{
+    glDeleteLists(tr->call_list, 1);
+    tr->morph->free(tr);
+    tr->next_free = cberg->free_head;
+    cberg->free_head = tr;
+}
+
+
+static void trile_draw_vanilla(Trile *tr)
+{ glCallList(tr->call_list); }
+
+static void trile_draw(Trile *tr, void *ignore)
+{
+    if (tr->state == TRILE_STABLE)
+        trile_draw_vanilla(tr);
+    else
+        tr->morph->draw(tr);
+}
+
+
+/***************************
+ ** Trile morph functions. 
+ **  select function at bottom (forward decls sucls) 
+ ** */
+
+
+/*** first the basic growing morph */
+
+static void grow_init(Trile *tr)
+{
+    tr->morph_data = (void *) malloc(sizeof(double));
+    *((double *)tr->morph_data) = 0.02; /* not 0; avoid normals crapping */
+}
+
+static void grow_free(Trile *tr)
+{
+    free(tr->morph_data);
+}
+
+static void grow_draw(Trile *tr)
+{
+    glPushMatrix();
+        glScaled(1.0,1.0, *((double *)tr->morph_data));
+        trile_draw_vanilla(tr);
+    glPopMatrix();
+}
+
+static void grow_init_iter(Trile *tr, cberg_state *cberg)
+{
+    *((double *)(tr->morph_data)) = *((double *)tr->morph_data) + cberg->elapsed;
+    if (*((double *)tr->morph_data) >= 1.0)
+        tr->state = TRILE_STABLE;
+}
+
+static void grow_dying_iter(Trile *tr, cberg_state *cberg)
+{
+    *((double *)tr->morph_data) = *((double *)tr->morph_data) - cberg->elapsed;
+    if (*((double *)tr->morph_data) <= 0.02) /* XXX avoid fast del/cons? */
+        tr->state = TRILE_DELETE;
+}
+
+/**** falling morph ****/
+
+static void fall_init(Trile *tr)
+{
+    tr->morph_data = (void *) malloc(sizeof(double));
+    *((double *)tr->morph_data) = 0.0;
+}
+
+static void fall_free(Trile *tr)
+{
+    free(tr->morph_data);
+}
+
+static void fall_draw(Trile *tr)
+{
+    glPushMatrix();
+        glTranslated(0.0,0.0,(0.5 - *((double *)tr->morph_data)) * 8);
+        trile_draw_vanilla(tr);
+    glPopMatrix();
+}
+
+static void fall_init_iter(Trile *tr, cberg_state *cberg)
+{
+    *((double *)(tr->morph_data)) = *((double *)tr->morph_data) + cberg->elapsed;
+    if (*((double *)tr->morph_data) >= 0.5)
+        tr->state = TRILE_STABLE;
+}
+
+static void fall_dying_iter(Trile *tr, cberg_state *cberg)
+{
+    *((double *)tr->morph_data) = *((double *)tr->morph_data) - cberg->elapsed;
+    if (*((double *)tr->morph_data) <= 0.0) /* XXX avoid fast del/cons? */
+        tr->state = TRILE_DELETE;
+}
+
+/**** yeast morph ****/
+
+static void yeast_init(Trile *tr)
+{
+    tr->morph_data = (void *) malloc(sizeof(double));
+    *((double *)tr->morph_data) = 0.02;
+}
+
+static void yeast_free(Trile *tr)
+{
+    free(tr->morph_data);
+}
+
+static void yeast_draw(Trile *tr)
+{
+    double x = tr->x * 0.5,
+           y = tr->y * M_SQRT3_2,
+           z = *((double *)tr->morph_data);
+
+    glPushMatrix();
+        glTranslated(x, y, 0);
+        glRotated(z*360, 0,0,1);
+        glScaled(z,z,z);
+        glTranslated(-x, -y, 0);
+        trile_draw_vanilla(tr);
+    glPopMatrix();
+}
+
+static void yeast_init_iter(Trile *tr, cberg_state *cberg)
+{
+    *((double *)(tr->morph_data)) = *((double *)tr->morph_data) + cberg->elapsed;
+    if (*((double *)tr->morph_data) >= 1.0)
+        tr->state = TRILE_STABLE;
+}
+
+static void yeast_dying_iter(Trile *tr, cberg_state *cberg)
+{
+    *((double *)tr->morph_data) = *((double *)tr->morph_data) - cberg->elapsed;
+    if (*((double *)tr->morph_data) <= 0.02) /* XXX avoid fast del/cons? */
+        tr->state = TRILE_DELETE;
+}
+
+/**** identity morph ****/
+
+static void identity_init(Trile *tr)
+{ tr->state = TRILE_STABLE; }
+
+static void identity_free(Trile *tr)
+{}
+
+static void identity_draw(Trile *tr)
+{ trile_draw_vanilla(tr); }
+
+static void identity_init_iter(Trile *tr, cberg_state *cberg)
+{}
+
+static void identity_dying_iter(Trile *tr, cberg_state *cberg)
+{ tr->state = TRILE_DELETE; }
+
+/** now to handle selection **/
+
+static const Morph morphs[] = {
+    {grow_init, grow_free, grow_draw, grow_init_iter, grow_dying_iter},
+    {fall_init, fall_free, fall_draw, fall_init_iter, fall_dying_iter},
+    {yeast_init, yeast_free, yeast_draw, yeast_init_iter, yeast_dying_iter},
+    {identity_init,  /*always put identity last to skip it..*/
+        identity_free, identity_draw, identity_init_iter, identity_dying_iter}
+};    
+
+static const Morph *select_morph()
+{ 
+    int nmorphs = countof(morphs);
+    if (crack)
+        return &morphs[random() % (nmorphs-1)]; 
+    else if (boring)
+        return &morphs[nmorphs-1]; 
+    else
+        return morphs;
+}
+
+
+/***************************
+ ** Trile superstructure functions. 
+ **  */
+
+
+static void triles_set_visible(cberg_state *cberg, Trile **root, int x, int y)
+{
+    Trile *parent = NULL, 
+          *iter = *root;
+    int goleft=0;
+
+    while (iter != NULL) {
+        parent = iter;
+        goleft = (iter->x > x || (iter->x == x && iter->y > y));
+        if (goleft)
+            iter = iter->left;
+        else if (iter->x == x && iter->y == y) {
+            iter->visible = 1;
+            return;
+        } else
+            iter = iter->right;
+    }
+
+    if (parent == NULL)
+        *root = trile_new(cberg, x,y, NULL, NULL);
+    else if (goleft)
+        parent->left = trile_new(cberg, x,y, parent, *root);
+    else
+        parent->right = trile_new(cberg, x,y, parent, *root);
+}
+
+static unsigned int triles_foreach(Trile *root, void (*f)(Trile *, void *), 
+  void *data)
+{
+    if (root == NULL) 
+        return 0;
+    
+    f(root, data);
+    return 1 + triles_foreach(root->left, f, data) 
+      + triles_foreach(root->right, f, data);
+}
+
+static void triles_update_state(Trile **root, cberg_state *cberg)
+{
+    int process_current = 1;
+    if (*root == NULL)
+        return;
+
+    while (process_current) {
+        if ( (*root)->visible ) {
+            if ( (*root)->state == TRILE_INIT )
+                (*root)->morph->init_iter(*root, cberg);
+            else if ( (*root)->state == TRILE_DYING ) {
+                (*root)->state = TRILE_INIT;
+                (*root)->morph->init_iter(*root, cberg);
+            } else if ( (*root)->state == TRILE_NEW ) 
+                (*root)->state = TRILE_INIT;
+
+            (*root)->visible = 0;
+        } else {
+            if ( (*root)->state == TRILE_STABLE )
+                (*root)->state = TRILE_DYING;
+            else if ( (*root)->state == TRILE_INIT ) {
+                (*root)->state = TRILE_DYING;
+                (*root)->morph->dying_iter(*root, cberg);
+            } else if ( (*root)->state == TRILE_DYING )
+                (*root)->morph->dying_iter(*root, cberg);
+        }
+
+        if ( (*root)->state == TRILE_DELETE ) {
+            Trile *splice_me;
+            process_current = 1;
+
+            if ((*root)->left == NULL) {
+                splice_me = (*root)->right;
+                if (splice_me)
+                    splice_me->parent = (*root)->parent;
+                else 
+                    process_current = 0;
+            } else if ((*root)->right == NULL) {
+                splice_me = (*root)->left;
+                splice_me->parent = (*root)->parent;
+            } else {
+                Trile *tmp;
+                for (splice_me = (*root)->right; splice_me->left != NULL; )
+                    splice_me = splice_me->left;
+                tmp = splice_me->right;
+
+                if (tmp) tmp->parent = splice_me->parent;
+
+                if (splice_me == splice_me->parent->left)
+                    splice_me->parent->left = tmp;
+                else
+                    splice_me->parent->right = tmp;
+
+                splice_me->parent = (*root)->parent;
+                splice_me->left = (*root)->left;
+                (*root)->left->parent = splice_me;
+                splice_me->right = (*root)->right;
+                if ((*root)->right)
+                    (*root)->right->parent = splice_me;
+            }
+            trile_free(cberg, *root);
+            *root = splice_me;
+        } else
+            process_current = 0;
+    }
+
+    if (*root) {
+        triles_update_state(&((*root)->left), cberg);
+        triles_update_state(&((*root)->right), cberg);
+    } 
+}
+
+static Trile *triles_find(Trile *tr, int x, int y)
+{
+    while (tr && !(tr->x == x && tr->y == y))
+        if (x < tr->x || (x == tr->x && y < tr->y))
+            tr = tr->left;
+        else
+            tr = tr->right;
+    return tr;
+}
+
+
+/***************************
+ ** Trile superstructure visibility functions. 
+ **  strategy fine, implementation lazy&retarded =/
+ **  */
+
+#ifdef DEBUG
+static double x_shit, y_shit;
+#endif
+
+static void calc_points(cberg_state *cberg, double *x1,double *y1, 
+        double *x2,double *y2, double *x3,double *y3, double *x4,double *y4)
+{
+    double zNear, x_nearcenter, y_nearcenter, nhalfwidth, x_center, y_center;
+
+
+    /* could cache these.. bahhhhhhhhhhhhhh */
+    double halfheight = tan(cberg->fovy / 2 * M_PI_180) * cberg->zNear;
+    double fovx_2 = atan(halfheight * cberg->aspect / cberg->zNear) * M_180_PI; 
+    double zFar = cberg->zFar + M_RAD7_4;
+    double fhalfwidth = zFar * tan(fovx_2 * M_PI_180)
+                      + M_RAD7_4 / cos(fovx_2 * M_PI_180);
+    double x_farcenter = cberg->x + zFar * cos(cberg->yaw * M_PI_180);
+    double y_farcenter = cberg->y + zFar * sin(cberg->yaw * M_PI_180);
+    *x1 = x_farcenter + fhalfwidth * cos((cberg->yaw - 90) * M_PI_180);
+    *y1 = y_farcenter + fhalfwidth * sin((cberg->yaw - 90) * M_PI_180);
+    *x2 = x_farcenter - fhalfwidth * cos((cberg->yaw - 90) * M_PI_180);
+    *y2 = y_farcenter - fhalfwidth * sin((cberg->yaw - 90) * M_PI_180);
+
+#ifdef DEBUG
+    printf("pos (%.3f,%.3f) @ %.3f || fovx: %f || fovy: %f\n", 
+            cberg->x, cberg->y, cberg->yaw, fovx_2 * 2, cberg->fovy);
+    printf("\tfarcenter: (%.3f,%.3f) || fhalfwidth: %.3f \n"
+           "\tp1: (%.3f,%.3f) || p2: (%.3f,%.3f)\n",
+            x_farcenter, y_farcenter, fhalfwidth, *x1, *y1, *x2, *y2);
+#endif
+
+    if (cberg->z - halfheight <= 0) /* near view plane hits xy */
+        zNear = cberg->zNear - M_RAD7_4;
+    else /* use bottom of frustum */
+        zNear = cberg->z / tan(cberg->fovy / 2 * M_PI_180) - M_RAD7_4;
+    nhalfwidth = zNear * tan(fovx_2 * M_PI_180)
+               + M_RAD7_4 / cos(fovx_2 * M_PI_180);
+    x_nearcenter = cberg->x + zNear * cos(cberg->yaw * M_PI_180);
+    y_nearcenter = cberg->y + zNear * sin(cberg->yaw * M_PI_180);
+    *x3 = x_nearcenter - nhalfwidth * cos((cberg->yaw - 90) * M_PI_180);
+    *y3 = y_nearcenter - nhalfwidth * sin((cberg->yaw - 90) * M_PI_180);
+    *x4 = x_nearcenter + nhalfwidth * cos((cberg->yaw - 90) * M_PI_180);
+    *y4 = y_nearcenter + nhalfwidth * sin((cberg->yaw - 90) * M_PI_180);
+
+#ifdef DEBUG
+    printf("\tnearcenter: (%.3f,%.3f) || nhalfwidth: %.3f\n"
+           "\tp3: (%.3f,%.3f) || p4: (%.3f,%.3f)\n",
+            x_nearcenter, y_nearcenter, nhalfwidth, *x3, *y3, *x4, *y4);
+#endif
+
+
+    /* center can be average or the intersection of diagonals.. */
+#if 0
+    {
+        double c = nhalfwidth * (zFar -zNear) / (fhalfwidth + nhalfwidth);
+        x_center = x_nearcenter + c * cos(cberg->yaw * M_PI_180);
+        y_center = y_nearcenter + c * sin(cberg->yaw * M_PI_180);
+    }
+#else
+    x_center = (x_nearcenter + x_farcenter) / 2;
+    y_center = (y_nearcenter + y_farcenter) / 2;
+#endif
+#ifdef DEBUG
+    x_shit = x_center;
+    y_shit = y_center;
+#endif
+    
+#define VSCALE(p)   *x##p = visibility * *x##p + (1-visibility) * x_center; \
+                    *y##p = visibility * *y##p + (1-visibility) * y_center
+
+    VSCALE(1);
+    VSCALE(2);
+    VSCALE(3);
+    VSCALE(4);
+#undef VSCALE
+}
+
+/* this is pretty stupid.. */
+static inline void minmax4(double a, double b, double c, double d, 
+  double *min, double *max)
+{
+    *min = *max = a;
+
+    if (b > *max)       *max = b;
+    else if (b < *min)  *min = b;
+    if (c > *max)       *max = c;
+    else if (c < *min)  *min = c;
+    if (d > *max)       *max = d;
+    else if (d < *min)  *min = d;
+}
+
+typedef struct {
+    double min, max, start, dx;
+} LS;
+
+#define check_line(a, b)                     \
+    if (fabs(y##a-y##b) > 0.001) {                    \
+        ls[count].dx = (x##b-x##a)/(y##b-y##a);               \
+        if (y##b > y##a) {                            \
+            ls[count].start = x##a;                     \
+            ls[count].min = y##a;                       \
+            ls[count].max = y##b;                       \
+        } else {                                  \
+            ls[count].start = x##b;                     \
+            ls[count].min = y##b;                       \
+            ls[count].max = y##a;                       \
+        }                                         \
+        ++count;                                    \
+    }
+
+static unsigned int build_ls(cberg_state *cberg, 
+                      double x1, double y1, double x2, double y2, 
+                      double x3, double y3, double x4, double y4, LS *ls,
+                      double *trough, double *peak)
+{
+    unsigned int count = 0;
+
+    check_line(1, 2);
+    check_line(2, 3);
+    check_line(3, 4);
+    check_line(4, 1);
+
+    minmax4(y1, y2, y3, y4, trough, peak);
+    return count;
+}
+
+#undef check_line
+
+/*needs bullshit to avoid double counts on corners.*/
+static void find_bounds(double y, double *left, double *right, LS *ls,
+        unsigned int nls)
+{
+    double x;
+    unsigned int i, set = 0;
+
+    for (i = 0; i != nls; ++i)
+        if (ls[i].min <= y && ls[i].max >= y) {
+            x = (y - ls[i].min) * ls[i].dx + ls[i].start;
+            if (!set) {
+                *left = x;
+                ++set;
+            } else if (fabs(x - *left) > 0.001) {
+                if (*left < x)
+                    *right = x;
+                else {
+                    *right = *left;
+                    *left = x;
+                }
+                return;
+            }
+        }
+
+    /* just in case we somehow blew up */
+    *left = 3.0;
+    *right = -3.0;
+}
+
+static void mark_visible(cberg_state *cberg)
+{
+    double trough, peak, yval, left=0, right=0;
+    double x1,y1, x2,y2, x3,y3, x4,y4;
+    int start, stop, x, y;
+    LS ls[4];
+    unsigned int nls;
+
+    calc_points(cberg, &x1,&y1, &x2,&y2, &x3,&y3, &x4,&y4);
+    nls = build_ls(cberg, x1,y1, x2,y2, x3,y3, x4,y4, ls, &trough, &peak);
+
+    start = (int) ceil(trough / M_SQRT3_2);
+    stop = (int) floor(peak / M_SQRT3_2);
+    
+    for (y = start; y <= stop; ++y) {
+        yval = y * M_SQRT3_2;
+        find_bounds(yval, &left, &right, ls, nls);
+        for (x = (int) ceil(left*2-1); x <= (int) floor(right*2); ++x) 
+            triles_set_visible(cberg, &(cberg->trile_head), x, y);
+    }
+}
+
+
+/***************************
+ ** color schemes
+ ** */
+
+static void plain_land(cberg_state *cberg, double z)
+{ glColor3f(pow((z/0.35),4),  z/0.35, pow((z/0.35),4)); }
+static void plain_water(cberg_state *cberg, double z)
+{ glColor3f(0.0, (z+0.35)*1.6, 0.8); }
+
+static void ice_land(cberg_state *cberg, double z)
+{ glColor3f((0.35 - z)/0.35, (0.35 - z)/0.35, 1.0); }
+static void ice_water(cberg_state *cberg, double z)
+{ glColor3f(0.0, (z+0.35)*1.6, 0.8); }
+
+
+static void magma_land(cberg_state *cberg, double z)
+{ glColor3f(z/0.35, z/0.2,0); }
+static void magma_lava(cberg_state *cberg, double z)
+{ glColor3f((z+0.35)*1.6, (z+0.35), 0.0); }
+
+static void vomit_solid(cberg_state *cberg, double z)
+{
+    double norm = fabs(z) / 0.35;
+    glColor3f( 
+      (1-norm) * cberg->vs0r + norm * cberg->vs1r, 
+      (1-norm) * cberg->vs0g + norm * cberg->vs1g, 
+      (1-norm) * cberg->vs0b + norm * cberg->vs1b 
+    );
+}
+static void vomit_fluid(cberg_state *cberg, double z)
+{
+    double norm = z / -0.35;
+    glColor3f( 
+      (1-norm) * cberg->vf0r + norm * cberg->vf1r, 
+      (1-norm) * cberg->vf0g + norm * cberg->vf1g, 
+      (1-norm) * cberg->vf0b + norm * cberg->vf1b 
+    );
+}
+
+
+static const Color colors[] = {
+    {"plain", plain_land, plain_water, {0.0, 0.0, 0.0, 1.0}},
+    {"ice", ice_land, ice_water, {0.0, 0.0, 0.0, 1.0}},
+    {"magma", magma_land, magma_lava, {0.3, 0.3, 0.0, 1.0}},
+    {"vomit", vomit_solid, vomit_fluid, {0.3, 0.3, 0.0, 1.0}}, /* no error! */
+};
+
+static const Color *select_color(cberg_state *cberg)
+{
+    unsigned int ncolors = countof(colors);
+    int idx = -1;
+    if ( ! strcmp(color, "random") )
+        idx = random() % ncolors;
+    else {
+        unsigned int i;
+        for (i = 0; i != ncolors; ++i)
+            if ( ! strcmp(colors[i].id, color) ) {
+                idx = i;
+                break;
+            }
+
+        if (idx == -1) {
+            printf("invalid color scheme selected; valid choices are:\n");
+            for (i = 0; i != ncolors; ++i)
+                printf("\t%s\n", colors[i].id);
+            printf("\t%s\n", "random");
+            idx = 0;
+        }
+    }
+
+    if ( ! strcmp(colors[idx].id, "vomit") ) { /* need to create it (ghetto) */
+        cberg->vs0r = random()/(double)RAND_MAX;
+        cberg->vs0g = random()/(double)RAND_MAX;
+        cberg->vs0b = random()/(double)RAND_MAX; 
+        cberg->vs1r = random()/(double)RAND_MAX; 
+        cberg->vs1g = random()/(double)RAND_MAX;
+        cberg->vs1b = random()/(double)RAND_MAX;
+        cberg->vf0r = random()/(double)RAND_MAX;
+        cberg->vf0g = random()/(double)RAND_MAX;
+        cberg->vf0b = random()/(double)RAND_MAX; 
+        cberg->vf1r = random()/(double)RAND_MAX; 
+        cberg->vf1g = random()/(double)RAND_MAX; 
+        cberg->vf1b = random()/(double)RAND_MAX; 
+ 
+        glClearColor(random()/(double)RAND_MAX,
+                     random()/(double)RAND_MAX,
+                     random()/(double)RAND_MAX,
+                     1.0);
+    } else {
+        glClearColor(colors[idx].bg[0],
+                     colors[idx].bg[1],
+                     colors[idx].bg[2],
+                     colors[idx].bg[3]);
+    }
+    return colors + idx;
+}
+
+
+/***************************
+ ** misc helper functions
+ ** */
+
+
+/* simple one for now.. */
+static inline double drunken_rando(double cur_val, double max, double width)
+{
+    double r = random() / (double) RAND_MAX * 2;
+    if (cur_val > 0)
+        if (r >= 1)
+            return cur_val + (r-1) * width * (1-cur_val/max);
+        else
+            return cur_val - r * width; 
+    else
+        if (r >= 1)
+            return cur_val - (r-1) * width * (1+cur_val/max);
+        else
+            return cur_val + r * width; 
+}
+
+
+/***************************
+ ** core crackberg routines
+ ** */
+
+ENTRYPOINT void reshape_crackberg (ModeInfo *mi, int w, int h);
+
+ENTRYPOINT void init_crackberg (ModeInfo *mi)
+{
+    cberg_state *cberg;
+
+    nsubdivs %= 16; /* just in case.. */
+
+    MI_INIT(mi, cbergs);
+
+    if (visibility > 1.0 || visibility < 0.2) {
+        printf("visibility must be in range [0.2 .. 1.0]\n");
+        visibility = 1.0;
+    }
+
+    cberg = &cbergs[MI_SCREEN(mi)];
+    
+    cberg->epoints = 1 + (1 << nsubdivs);
+    cberg->tpoints = cberg->epoints * (cberg->epoints + 1) / 2;
+    cberg->ntris = (1 << (nsubdivs << 1));
+    cberg->tnorms = ( (flat) ? cberg->ntris : cberg->tpoints);
+    cberg->dx0 = 1.0 / (1 << nsubdivs);
+
+    cberg->heights = malloc(cberg->tpoints * sizeof(double));
+    cberg->norms = malloc(3 * cberg->tnorms * sizeof(double));
+
+    cberg->glx_context = init_GL(mi);
+    cberg->motion_state = MOTION_AUTO;
+    cberg->mspeed = 1.0;
+    cberg->z = 0.5;
+
+    cberg->fovy = 60.0;
+    cberg->zNear = 0.5;
+    cberg->zFar = 5.0;
+
+    cberg->draw_elapsed = 1.0;
+
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glShadeModel((flat) ? GL_FLAT : GL_SMOOTH);
+# ifndef HAVE_JWZGLES /* #### glPolygonMode other than GL_FILL unimplemented */
+    glPolygonMode(GL_FRONT_AND_BACK, (MI_IS_WIREFRAME(mi)) ? GL_LINE : GL_FILL);
+# endif
+
+    if (lit) {
+        glEnable(GL_LIGHTING);
+        glEnable(GL_LIGHT0);
+        glEnable(GL_COLOR_MATERIAL);
+        glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
+        glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
+        glEnable(GL_NORMALIZE);
+        glEnable(GL_RESCALE_NORMAL); 
+    }
+
+    cberg->color = select_color(cberg);
+
+    reshape_crackberg(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
+}
+
+ENTRYPOINT void reshape_crackberg (ModeInfo *mi, int w, int h)
+{
+    int h2;
+    cberg_state *cberg = &cbergs[MI_SCREEN(mi)];
+
+    if (letterbox && (h2 = w * 9 / 16) < h) {
+        glViewport(0, (h-h2)/2, w, h2);
+        cberg->aspect = w/(double)h2;
+    } else {
+        glViewport (0, 0, w, h);
+        cberg->aspect = w/(double)h;
+    }
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(cberg->fovy, cberg->aspect, cberg->zNear, cberg->zFar);
+    glMatrixMode(GL_MODELVIEW);
+}
+
+ENTRYPOINT Bool crackberg_handle_event (ModeInfo *mi, XEvent *ev)
+{
+    cberg_state *cberg = &cbergs[MI_SCREEN(mi)];
+    KeySym keysym = 0;
+    char c = 0;
+    if (ev->xany.type == KeyPress || ev->xany.type == KeyRelease)
+      XLookupString (&ev->xkey, &c, 1, &keysym, 0);
+
+    if (ev->xany.type == KeyPress) {
+        switch (keysym) {
+            case XK_Left:   cberg->motion_state |= MOTION_LROT;  break;
+            case XK_Prior:  cberg->motion_state |= MOTION_LROT;  break;
+            case XK_Right:  cberg->motion_state |= MOTION_RROT;  break;
+            case XK_Next:   cberg->motion_state |= MOTION_RROT;  break;
+            case XK_Down:   cberg->motion_state |= MOTION_BACK;  break;
+            case XK_Up:     cberg->motion_state |= MOTION_FORW;  break;
+            case '1':       cberg->motion_state |= MOTION_DEC;   break; 
+            case '2':       cberg->motion_state |= MOTION_INC;   break;
+            case 'a':       cberg->motion_state |= MOTION_LEFT;  break;
+            case 'd':       cberg->motion_state |= MOTION_RIGHT; break;
+            case 's':       cberg->motion_state |= MOTION_BACK;  break;
+            case 'w':       cberg->motion_state |= MOTION_FORW;  break;
+            default:        return False;
+        }
+        cberg->motion_state |= MOTION_MANUAL;
+    } else if (ev->xany.type == KeyRelease) { 
+#if 0
+        XEvent peek_ev;
+        if (XPending(mi->dpy)) {
+            XPeekEvent(mi->dpy, &peek_ev);
+            if (peek_ev.type == KeyPress
+             && peek_ev.xkey.keycode == ev->xkey.keycode       
+             && peek_ev.xkey.time - ev->xkey.time < 2) {
+                XNextEvent(mi->dpy, &peek_ev); /* drop bullshit repeat events */
+                return False;
+            }
+        }
+#endif
+
+        switch (keysym) {
+            case XK_Left:   cberg->motion_state &= ~MOTION_LROT;  break;
+            case XK_Prior:  cberg->motion_state &= ~MOTION_LROT;  break;
+            case XK_Right:  cberg->motion_state &= ~MOTION_RROT;  break;
+            case XK_Next:   cberg->motion_state &= ~MOTION_RROT;  break;
+            case XK_Down:   cberg->motion_state &= ~MOTION_BACK;  break;
+            case XK_Up:     cberg->motion_state &= ~MOTION_FORW;  break;
+            case '1':       cberg->motion_state &= ~MOTION_DEC;   break; 
+            case '2':       cberg->motion_state &= ~MOTION_INC;   break;
+            case 'a':       cberg->motion_state &= ~MOTION_LEFT;  break;
+            case 'd':       cberg->motion_state &= ~MOTION_RIGHT; break;
+            case 's':       cberg->motion_state &= ~MOTION_BACK;  break;
+            case 'w':       cberg->motion_state &= ~MOTION_FORW;  break;
+            case ' ':       
+                if (cberg->motion_state == MOTION_MANUAL)
+                    cberg->motion_state = MOTION_AUTO;     
+                break;
+            default:            return False;
+        }
+    } else if (ev->xany.type == ButtonPress &&
+               ev->xbutton.button == Button1) {
+      cberg->button_down_p = True;
+      cberg->mouse_x = ev->xbutton.x;
+      cberg->mouse_y = ev->xbutton.y;
+      cberg->motion_state = MOTION_MANUAL;
+      cberg->paused.tv_sec = 0;
+    } else if (ev->xany.type == ButtonRelease &&
+               ev->xbutton.button == Button1) {
+      cberg->button_down_p = False;
+      cberg->motion_state = MOTION_AUTO;
+      /* After mouse-up, don't go back into auto-motion mode for a second, so
+         that repeated click-and-drag gestures don't fight with auto-motion. */
+      gettimeofday(&cberg->paused, NULL);
+    } else if (ev->xany.type == MotionNotify &&
+               cberg->button_down_p) {
+      int dx = ev->xmotion.x - cberg->mouse_x;
+      int dy = ev->xmotion.y - cberg->mouse_y;
+      cberg->mouse_x = ev->xmotion.x;
+      cberg->mouse_y = ev->xmotion.y;
+      cberg->motion_state = MOTION_MANUAL;
+
+      /* Take the larger dimension, since motion_state doesn't scale */
+      if (dx > 0 && dx > dy) dy = 0;
+      if (dx < 0 && dx < dy) dy = 0;
+      if (dy > 0 && dy > dx) dx = 0;
+      if (dy < 0 && dy < dx) dx = 0;
+
+      {
+        int rot = current_device_rotation();
+        int swap;
+        while (rot <= -180) rot += 360;
+        while (rot >   180) rot -= 360;
+        if (rot > 135 || rot < -135)		/* 180 */
+            dx = -dx, dy = -dy;
+        else if (rot > 45)			/* 90 */
+          swap = dx, dx = -dy, dy = swap;
+        else if (rot < -45)			/* 270 */
+          swap = dx, dx = dy, dy = -swap;
+      }
+
+      if      (dx > 0) cberg->motion_state |= MOTION_LEFT;
+      else if (dx < 0) cberg->motion_state |= MOTION_RIGHT;
+      else if (dy > 0) cberg->motion_state |= MOTION_FORW;
+      else if (dy < 0) cberg->motion_state |= MOTION_BACK;
+    } else
+        return False;
+    return True;
+}   
+ 
+ENTRYPOINT void draw_crackberg (ModeInfo *mi)
+{
+    cberg_state *cberg = &cbergs[MI_SCREEN(mi)];
+    struct timeval cur_frame_t;
+    double cur_frame;
+    static const float lpos[] = {2.0,0.0,-0.3,0.0};
+
+    if (!cberg->glx_context) /*XXX does this get externally tweaked? it kinda*/
+        return;               /*XXX can't.. check it in crackberg_init*/
+
+    glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(cberg->glx_context));
+
+    gettimeofday(&cur_frame_t, NULL);
+    cur_frame = cur_frame_t.tv_sec + cur_frame_t.tv_usec / 1.0E6;
+    if ( cberg->prev_frame ) { /*not first run */
+
+        cberg->elapsed = cur_frame - cberg->prev_frame;
+
+        if (cberg->motion_state == MOTION_AUTO &&
+            cberg->paused.tv_sec < cur_frame_t.tv_sec) {
+            cberg->x += cberg->dx * cberg->elapsed;
+            cberg->y += cberg->dy * cberg->elapsed;
+            /* cberg->z */
+            /* cberg->pitch */
+            /* cberg->roll */
+            cberg->yaw += cberg->dyaw * cberg->elapsed;
+
+            cberg->draw_elapsed += cberg->elapsed;
+            if (cberg->draw_elapsed >= 0.8) {
+                cberg->draw_elapsed = 0.0;
+                cberg->dx = drunken_rando(cberg->dx, 2.5, 0.8);
+                cberg->dy = drunken_rando(cberg->dy, 2.5, 0.8);
+                /* cberg->dz */
+                /* cberg->dpitch */
+                /* cberg->droll */
+                cberg->dyaw = drunken_rando(cberg->dyaw, 40.0,  8.0);
+            }
+        } else {
+            double scale = cberg->elapsed * cberg->mspeed;
+            if (cberg->motion_state & MOTION_BACK) {
+                cberg->x -= cos(cberg->yaw * M_PI_180) * scale;
+                cberg->y -= sin(cberg->yaw * M_PI_180) * scale;
+            }
+            if (cberg->motion_state & MOTION_FORW) {
+                cberg->x += cos(cberg->yaw * M_PI_180) * scale;
+                cberg->y += sin(cberg->yaw * M_PI_180) * scale;
+            }
+
+            if (cberg->motion_state & MOTION_LEFT) {
+                cberg->x -= sin(cberg->yaw * M_PI_180) * scale;
+                cberg->y += cos(cberg->yaw * M_PI_180) * scale;
+            }
+            if (cberg->motion_state & MOTION_RIGHT) {
+                cberg->x += sin(cberg->yaw * M_PI_180) * scale;
+                cberg->y -= cos(cberg->yaw * M_PI_180) * scale;
+            }
+
+            if (cberg->motion_state & MOTION_LROT)
+                cberg->yaw += 45 * scale;
+            if (cberg->motion_state & MOTION_RROT)
+                cberg->yaw -= 45 * scale;
+
+            if (cberg->motion_state & MOTION_DEC)
+                cberg->mspeed /= pow(MSPEED_SCALE, cberg->draw_elapsed);
+            if (cberg->motion_state & MOTION_INC)
+                cberg->mspeed *= pow(MSPEED_SCALE, cberg->draw_elapsed);
+
+        }
+    }
+    cberg->prev_frame = cur_frame;
+
+    mark_visible(cberg);
+    triles_update_state(&(cberg->trile_head), cberg);
+        
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glLoadIdentity();
+    glRotatef(current_device_rotation(), 0, 0, 1);
+    gluLookAt(0,0,0, 1,0,0, 0,0,1);
+    glLightfv(GL_LIGHT0, GL_POSITION, lpos);
+    /*glRotated(cberg->roll, 1,0,0); / * XXX blah broken and unused for now..* /
+    glRotated(cberg->pitch, 0,1,0); */
+    glRotated(-cberg->yaw, 0,0,1); /* camera sees ->yaw over */
+    glTranslated(-cberg->x, -cberg->y, -cberg->z);
+
+    mi->polygon_count = cberg->ntris * 
+      triles_foreach(cberg->trile_head, trile_draw,(void *) cberg);
+    
+    if (mi->fps_p)  
+        do_fps(mi);
+
+#ifdef DEBUG
+    glBegin(GL_LINES);
+        glColor3f(1.0,0.0,0.0);
+        glVertex3d(x_shit, y_shit, 0.0);
+        glVertex3d(x_shit, y_shit, 1.0);
+    glEnd();
+#endif
+
+    glFinish();
+    glXSwapBuffers(MI_DISPLAY(mi), MI_WINDOW(mi));
+}
+
+/* uh */
+ENTRYPOINT void free_crackberg (ModeInfo *mi)
+{
+  cberg_state *cberg = &cbergs[MI_SCREEN(mi)];
+  if (cberg->norms)
+    free(cberg->norms);
+  free(cberg->heights);
+}
+
+XSCREENSAVER_MODULE ("Crackberg", crackberg)
+
+#endif /* USE_GL */