Original 5.40

1 files changed, 799 insertions, 0 deletions

diff --git a/hacks/glx/antspotlight.c b/hacks/glx/antspotlight.c
new file mode 100644
index 0000000..55bb80c
--- /dev/null
+++ b/hacks/glx/antspotlight.c
@@ -0,0 +1,799 @@
+/*
+ * 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.
+ *
+ * Copyright 2003 Blair Tennessy
+ */
+
+#ifdef STANDALONE
+#define DEFAULTS	    "*delay:   20000   \n" \
+			    "*showFPS: False   \n" \
+                            "*useSHM:  True    \n"
+
+# define free_antspotlight 0
+# define release_antspotlight 0
+#include "xlockmore.h"
+#else
+#include "xlock.h"
+#endif
+
+#ifdef HAVE_JWXYZ
+# include "jwxyz.h"
+#else
+# include <X11/Xlib.h>
+# include <GL/gl.h>
+# include <GL/glu.h>
+#endif
+
+#ifdef HAVE_JWZGLES
+# include "jwzgles.h"
+#endif /* HAVE_JWZGLES */
+
+#include "sphere.h"
+#include "tube.h"
+#include "rotator.h"
+#include "gltrackball.h"
+
+ENTRYPOINT ModeSpecOpt antspotlight_opts = {
+  0, NULL, 0, NULL, NULL
+};
+
+#ifdef USE_MODULES
+ModStruct   antspotlight_description = {
+  "antspotlight", "init_antspotlight", "draw_antspotlight", 
+  (char *) NULL, "draw_antspotlight", "change_antspotlight",
+  (char *) NULL, &antspotlight_opts, 1000, 1, 1, 1, 4, 1.0, "",
+  "draws an ant scoping the screen", 0, NULL
+};
+#endif
+
+#define Scale4Window               0.3
+#define Scale4Iconic               0.4
+
+#define sqr(A)                     ((A)*(A))
+
+#ifndef Pi
+#define Pi M_PI
+#endif
+
+#include "ants.h"
+#include "grab-ximage.h"
+
+typedef struct {
+  GLXContext *glx_context;
+  rotator    *rot;
+  trackball_state *trackball;
+  Bool        button_down_p;
+
+  GLfloat max_tx, max_ty;
+  int mono, wire, ticks;
+  GLuint screentexture;
+
+  Ant *ant;
+  double boardsize;
+  GLfloat spot_direction[3];
+  int mag;
+
+  Bool mipmap_p;
+  Bool waiting_for_image_p;
+
+} antspotlightstruct;
+
+static antspotlightstruct *antspotlight = (antspotlightstruct *) NULL;
+
+#define NUM_SCENES      2
+
+/* draw method for ant */
+static Bool draw_ant(ModeInfo *mi, antspotlightstruct *mp,
+                     const GLfloat *Material, int mono, int shadow, 
+	      float ant_step, Bool (*sphere)(float), Bool (*cone)(float))
+{
+  
+  float cos1 = cos(ant_step);
+  float cos2 = cos(ant_step + 2 * Pi / 3);
+  float cos3 = cos(ant_step + 4 * Pi / 3);
+  float sin1 = sin(ant_step);
+  float sin2 = sin(ant_step + 2 * Pi / 3);
+  float sin3 = sin(ant_step + 4 * Pi / 3);
+  
+/* Apparently this is a performance killer on many systems...
+   glEnable(GL_POLYGON_SMOOTH);
+ */
+  glEnable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+  glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, mp->mono ? MaterialGray5 : Material);
+  glEnable(GL_CULL_FACE);
+  glPushMatrix();
+  glScalef(1, 1.3, 1);
+  if(!((*sphere)(0.18)))
+    return False;
+  glScalef(1, 1 / 1.3, 1);
+  glTranslatef(0.00, 0.30, 0.00);
+  if(!((*sphere)(0.2)))
+    return False;
+  
+  glTranslatef(-0.05, 0.17, 0.05);
+  glRotatef(-90, 1, 0, 0);
+  glRotatef(-25, 0, 1, 0);
+  if(!((*cone)(0.05)))
+    return False;
+  glTranslatef(0.00, 0.10, 0.00);
+  if(!((*cone)(0.05)))
+    return False;
+  glRotatef(25, 0, 1, 0);
+  glRotatef(90, 1, 0, 0);
+  
+  glScalef(1, 1.3, 1);
+  glTranslatef(0.15, -0.65, 0.05);
+  if(!((*sphere)(0.25)))
+    return False;
+  glScalef(1, 1 / 1.3, 1);
+  glPopMatrix();
+  glDisable(GL_CULL_FACE);
+  
+  glDisable(GL_LIGHTING);
+  
+  /* ANTENNAS */
+  glEnable(GL_LINE_SMOOTH);
+  glEnable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+   
+  glBegin(GL_LINES);
+  glColor3fv(mp->mono ? MaterialGray5 : Material);
+  glVertex3f(0.00, 0.30, 0.00);
+  glColor3fv(MaterialGray);
+  glVertex3f(0.40, 0.70, 0.40);
+  mi->polygon_count++;
+  glColor3fv(mp->mono ? MaterialGray5 : Material);
+  glVertex3f(0.00, 0.30, 0.00);
+  glColor3fv(MaterialGray);
+  glVertex3f(0.40, 0.70, -0.40);
+  mi->polygon_count++;
+  glEnd();
+
+  if(!shadow) {
+    glBegin(GL_POINTS);
+    glColor3fv(mp->mono ? MaterialGray6 : MaterialGray5);
+    glVertex3f(0.40, 0.70, 0.40);
+    mi->polygon_count++;
+    glVertex3f(0.40, 0.70, -0.40);
+    mi->polygon_count++;
+    glEnd();
+  }
+
+  /* LEFT-FRONT ARM */
+  glBegin(GL_LINE_STRIP);
+  glColor3fv(mp->mono ? MaterialGray5 : Material);
+  glVertex3f(0.00, 0.05, 0.18);
+  glVertex3f(0.35 + 0.05 * cos1, 0.15, 0.25);
+  mi->polygon_count++;
+  glColor3fv(MaterialGray);
+  glVertex3f(-0.20 + 0.05 * cos1, 0.25 + 0.1 * sin1, 0.45);
+  mi->polygon_count++;
+  glEnd();
+
+  /* LEFT-CENTER ARM */
+  glBegin(GL_LINE_STRIP);
+  glColor3fv(mp->mono ? MaterialGray5 : Material);
+  glVertex3f(0.00, 0.00, 0.18);
+  glVertex3f(0.35 + 0.05 * cos2, 0.00, 0.25);
+  mi->polygon_count++;
+  glColor3fv(MaterialGray);
+  glVertex3f(-0.20 + 0.05 * cos2, 0.00 + 0.1 * sin2, 0.45);
+  mi->polygon_count++;
+  glEnd();
+
+  /* LEFT-BACK ARM */
+  glBegin(GL_LINE_STRIP);
+  glColor3fv(mp->mono ? MaterialGray5 : Material);
+  glVertex3f(0.00, -0.05, 0.18);
+  glVertex3f(0.35 + 0.05 * cos3, -0.15, 0.25);
+  mi->polygon_count++;
+  glColor3fv(MaterialGray);
+  glVertex3f(-0.20 + 0.05 * cos3, -0.25 + 0.1 * sin3, 0.45);
+  mi->polygon_count++;
+  glEnd();
+
+  /* RIGHT-FRONT ARM */
+  glBegin(GL_LINE_STRIP);
+  glColor3fv(mp->mono ? MaterialGray5 : Material);
+  glVertex3f(0.00, 0.05, -0.18);
+  glVertex3f(0.35 - 0.05 * sin1, 0.15, -0.25);
+  mi->polygon_count++;
+  glColor3fv(MaterialGray);
+  glVertex3f(-0.20 - 0.05 * sin1, 0.25 + 0.1 * cos1, -0.45);
+  mi->polygon_count++;
+  glEnd();
+
+  /* RIGHT-CENTER ARM */
+  glBegin(GL_LINE_STRIP);
+  glColor3fv(mp->mono ? MaterialGray5 : Material);
+  glVertex3f(0.00, 0.00, -0.18);
+  glVertex3f(0.35 - 0.05 * sin2, 0.00, -0.25);
+  mi->polygon_count++;
+  glColor3fv(MaterialGray);
+  glVertex3f(-0.20 - 0.05 * sin2, 0.00 + 0.1 * cos2, -0.45);
+  mi->polygon_count++;
+  glEnd();
+
+  /* RIGHT-BACK ARM */
+  glBegin(GL_LINE_STRIP);
+  glColor3fv(mp->mono ? MaterialGray5 : Material);
+  glVertex3f(0.00, -0.05, -0.18);
+  glVertex3f(0.35 - 0.05 * sin3, -0.15, -0.25);
+  mi->polygon_count++;
+  glColor3fv(MaterialGray);
+  glVertex3f(-0.20 - 0.05 * sin3, -0.25 + 0.1 * cos3, -0.45);
+  mi->polygon_count++;
+  glEnd();
+
+  if(!shadow) {
+    glBegin(GL_POINTS);
+    glColor3fv(MaterialGray5);
+    glVertex3f(-0.20 + 0.05 * cos1, 0.25 + 0.1 * sin1, 0.45);
+    glVertex3f(-0.20 + 0.05 * cos2, 0.00 + 0.1 * sin2, 0.45);
+    glVertex3f(-0.20 + 0.05 * cos3, -0.25 + 0.1 * sin3, 0.45);
+    glVertex3f(-0.20 - 0.05 * sin1, 0.25 + 0.1 * cos1, -0.45);
+    glVertex3f(-0.20 - 0.05 * sin2, 0.00 + 0.1 * cos2, -0.45);
+    glVertex3f(-0.20 - 0.05 * sin3, -0.25 + 0.1 * cos3, -0.45);
+    mi->polygon_count += 6;
+    glEnd();
+  }
+
+  glEnable(GL_LIGHTING);
+
+  return True;
+}
+
+/* filled sphere */
+static Bool mySphere(float radius)
+{
+#if 0
+  GLUquadricObj *quadObj;
+  
+  if((quadObj = gluNewQuadric()) == 0)
+    return False;
+
+  gluQuadricDrawStyle(quadObj, (GLenum) GLU_FILL);
+  gluSphere(quadObj, radius, 16, 16);
+  gluDeleteQuadric(quadObj);
+#else
+    glPushMatrix();
+    glScalef (radius, radius, radius);
+    glRotatef (90, 1, 0, 0);
+    unit_sphere (16, 16, False);
+    glPopMatrix();
+#endif
+  return True;
+}
+
+/* silhouette sphere */
+static Bool mySphere2(float radius)
+{
+#if 0
+  GLUquadricObj *quadObj;
+
+  if((quadObj = gluNewQuadric()) == 0)
+	return False;
+  gluQuadricDrawStyle(quadObj, (GLenum) GLU_LINE);
+  gluSphere(quadObj, radius, 16, 8);
+  gluDeleteQuadric(quadObj);
+#else
+  /* #### no GLU_LINE */
+    glPushMatrix();
+    glScalef (radius, radius, radius);
+    glRotatef (90, 1, 0, 0);
+    unit_sphere (16, 16, True);
+    glPopMatrix();
+#endif
+  return True;
+}
+
+/* no cone */
+static Bool myCone2(float radius) { return True; }
+
+static void draw_board(ModeInfo *mi, antspotlightstruct *mp)
+{
+  int i, j;
+  double cutoff = Pi/3.0;
+  double center[3];
+  double centertex[2];
+
+  glEnable(GL_TEXTURE_2D);
+  glBindTexture(GL_TEXTURE_2D, mp->screentexture);
+  glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray6);
+
+  /* draw mesh */
+
+  /* center is roughly spotlight position */
+  center[0] = mp->ant->position[0];/* + cos(ant->direction); */
+  center[1] = 0.0;
+  center[2] = mp->ant->position[2];/* - 0.7*sin(ant->direction);*/
+
+  centertex[0] = (mp->boardsize/2.0+center[0]) * mp->max_tx / mp->boardsize;
+  centertex[1] = mp->max_ty - ((mp->boardsize/2.0+center[2]) * mp->max_ty / mp->boardsize);
+
+/*   glPolygonMode(GL_FRONT, GL_LINE); */
+/*   glDisable(GL_TEXTURE_2D); */
+
+  /* 
+     the vertices determined here should correspond to the illuminated
+     board.  ideally the code adapts vertex distribution to the
+     intensity and shape of the light.
+     
+     i should be finding the intersection of the cone of light and
+     the board-plane.
+  */
+  for(i = -12; i < 12; ++i) {
+
+    double theta1, theta2;
+
+    glBegin(GL_TRIANGLE_STRIP);
+    glNormal3f(0.0, 1.0, 0.0);
+
+    glTexCoord2f(centertex[0], centertex[1]);
+    glVertex3f(center[0], 0.01, center[2]);
+
+    /* watch those constants */
+    theta1 = mp->ant->direction + i*(cutoff/8);
+    theta2 = mp->ant->direction + (i+1)*(cutoff/8);
+
+    for(j = 1; j <= 64; ++j) {
+      double point[3], tex[2];
+      /* double fj = pow(1.05, j) - 1.0;*/
+      double fj = j / 6.0;
+      point[0] = center[0] + fj*cos(theta1);
+      point[1] = 0.0;
+      point[2] = center[2] - fj*sin(theta1);
+
+      tex[0] = (mp->boardsize/2.0+point[0]) * mp->max_tx / mp->boardsize;
+      tex[1] = (mp->boardsize/2.0+point[2]) * mp->max_ty / mp->boardsize;
+
+      glTexCoord2f(tex[0], tex[1]);
+      glVertex3f(point[0], point[1], point[2]);
+
+      point[0] = center[0] + fj*cos(theta2);
+      point[1] = 0.0;
+      point[2] = center[2] - fj*sin(theta2);
+
+      tex[0] = (mp->boardsize/2.0+point[0]) * mp->max_tx / mp->boardsize;
+      tex[1] = (mp->boardsize/2.0+point[2]) * mp->max_ty / mp->boardsize;
+
+      glTexCoord2f(tex[0], tex[1]);
+      glVertex3f(point[0], point[1], point[2]);
+      mi->polygon_count++;
+    }
+
+    glEnd();
+  }
+
+  glDisable(GL_TEXTURE_2D);
+}
+
+/* return euclidean distance between two points */
+static double distance(double x[3], double y[3])
+{
+  double dx = x[0] - y[0];
+  double dz = x[2] - y[2];
+  return sqrt(dx*dx + dz*dz);
+}
+
+/* determine a new goal */
+static void find_goal(antspotlightstruct *mp)
+{
+  do {
+    mp->ant->goal[0] = random()%((int)(mp->boardsize+0.5)-2) - mp->boardsize/2.0 + 1.0;
+    mp->ant->goal[1] = 0.0;
+    mp->ant->goal[2] = random()%((int)(mp->boardsize+0.5)-2) - mp->boardsize/2.0 + 1.0;
+  }
+  while(distance(mp->ant->position, mp->ant->goal) < 2.0);
+}
+
+/* construct our ant */
+static void build_ant(antspotlightstruct *mp)
+{
+  mp->ant = (Ant *) malloc(sizeof (Ant));
+  mp->ant->position[0] = 0.0;
+  mp->ant->position[1] = 0.0;
+  mp->ant->position[2] = 0.0;
+  mp->ant->direction = 0.0;
+  mp->ant->velocity = 0.02;
+  mp->ant->material = MaterialGray5;
+  mp->ant->step = 0;
+  find_goal(mp);
+}
+
+#define EPSILON 0.01
+
+static double sign(double d)
+{
+  return d < 0.0 ? -1.0 : 1.0;
+}
+
+static double min(double a, double b)
+{
+  return a < b ? a : b;
+}
+
+/*
+static double max(double a, double b)
+{
+  return a > b ? a : b;
+}
+*/
+
+/* find a new goal and reset steps */
+static void reset_ant(antspotlightstruct *mp)
+{
+  find_goal(mp);
+}
+
+/* draw ant composed of skeleton and glass */
+static void show_ant(ModeInfo *mi, antspotlightstruct *mp)
+{
+
+  glPushMatrix();
+
+  /* move into position */
+  glTranslatef(mp->ant->position[0], 0.33, mp->ant->position[2]);
+  glRotatef(180.0 + mp->ant->direction*180.0/Pi, 0.0, 1.0, 0.0);
+  glRotatef(90.0, 0.0, 0.0, 1.0);
+
+  /* draw skeleton */
+  draw_ant(mi, mp, mp->ant->material, mp->mono, 0, mp->ant->step, mySphere2, myCone2);
+
+  /* draw glass */
+  if(!mp->wire && !mp->mono) {
+    glEnable(GL_BLEND);
+    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGrayB);
+    glColor4fv(MaterialGrayB);
+    draw_ant(mi, mp, MaterialGrayB, mp->mono, 0, mp->ant->step, mySphere, myCone2);
+    glDisable(GL_BLEND);
+  }
+
+  glPopMatrix();
+}
+
+static void draw_antspotlight_strip(ModeInfo *mi)
+{
+  antspotlightstruct *mp = &antspotlight[MI_SCREEN(mi)];
+
+  /* compute spotlight position and direction */
+  GLfloat light1_position[4];
+
+  light1_position[0] = mp->ant->position[0] + 0.7*cos(mp->ant->direction);
+  light1_position[1] = 0.5;
+  light1_position[2] = mp->ant->position[2] - 0.7*sin(mp->ant->direction);
+  light1_position[3] = 1.0;
+
+  mp->spot_direction[0] = cos(mp->ant->direction);
+  mp->spot_direction[1] = -0.5;
+  mp->spot_direction[2] = -sin(mp->ant->direction);
+
+  glLightfv(GL_LIGHT2, GL_POSITION, light1_position);
+  glLightfv(GL_LIGHT2, GL_SPOT_DIRECTION, mp->spot_direction);
+  
+  glEnable(GL_LIGHT2);
+  glDisable(GL_LIGHT0);
+  glDisable(GL_LIGHT1);
+
+  /* draw board */
+  if(mp->wire)
+    ;
+  else
+    draw_board(mi, mp);
+
+  glDisable(GL_LIGHT2);
+  glEnable(GL_LIGHT0);
+  glEnable(GL_LIGHT1);
+  
+  /* now modify ant */
+  show_ant(mi, mp);
+
+  /* near goal, bend path towards next step */
+  if(distance(mp->ant->position, mp->ant->goal) < 0.2) {
+    reset_ant(mp);
+  }
+
+  if(random()%100 == 0) {
+    reset_ant(mp);
+  }
+
+
+  /* move toward goal, correct ant direction if required */
+  else {
+    
+    /* difference */
+    double dx = mp->ant->goal[0] - mp->ant->position[0];
+    double dz = -(mp->ant->goal[2] - mp->ant->position[2]);
+    double theta, ideal, dt;
+    
+    if(fabs(dx) > EPSILON) {
+      theta = atan(dz/dx);
+      if(dx < 0.0)
+	theta += Pi;
+    }
+    else
+      theta = dz > 0.0 ? (1.0/2.0)*Pi : (3.0/2.0)*Pi;
+    
+    if(theta < 0.0)
+      theta += 2*Pi;
+    
+    ideal = theta - mp->ant->direction;
+    if(ideal > Pi)
+      ideal -= 2*Pi;
+    
+    /* compute correction */
+    dt = sign(ideal) * min(fabs(ideal), Pi/100.0);
+    mp->ant->direction += dt;
+    while(mp->ant->direction < 0.0)
+      mp->ant->direction += 2*Pi;
+    while(mp->ant->direction > 2*Pi)
+      mp->ant->direction -= 2*Pi;
+  }
+
+  mp->ant->position[0] += mp->ant->velocity * cos(mp->ant->direction);
+  mp->ant->position[2] += mp->ant->velocity * sin(-mp->ant->direction);
+  mp->ant->step += 10*mp->ant->velocity;
+  while(mp->ant->step > 2*Pi)
+    mp->ant->step -= 2*Pi;
+}
+
+ENTRYPOINT void reshape_antspotlight(ModeInfo * mi, int width, int height)
+{
+  double h = (GLfloat) height / (GLfloat) width;  
+  int y = 0;
+  int size = 2;
+
+  if (width > height * 5) {   /* tiny window: show middle */
+    height = width * 9/16;
+    y = -height/2;
+    h = height / (GLfloat) width;
+  }
+
+  glViewport(0, y, width, height);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+
+  gluPerspective(45, 1/h, 1.0, 25.0);
+
+  glMatrixMode(GL_MODELVIEW);
+  glLineWidth(size);
+  glPointSize(size);
+}
+
+/* lighting variables */
+static const GLfloat front_shininess[] = {60.0};
+static const GLfloat front_specular[] = {0.8, 0.8, 0.8, 1.0};
+static const GLfloat ambient[] = {0.4, 0.4, 0.4, 1.0};
+/*static const GLfloat ambient2[] = {0.0, 0.0, 0.0, 0.0};*/
+static const GLfloat diffuse[] = {1.0, 1.0, 1.0, 1.0};
+static const GLfloat position0[] = {1.0, 5.0, 1.0, 0.0};
+static const GLfloat position1[] = {-1.0, -5.0, 1.0, 0.0};
+/*static const GLfloat lmodel_ambient[] = {0.8, 0.8, 0.8, 1.0};*/
+static const GLfloat lmodel_twoside[] = {GL_TRUE};
+static const GLfloat spotlight_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
+static const GLfloat spotlight_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
+
+static void pinit(void)
+{
+  glClearDepth(1.0);
+
+  /* setup twoside lighting */
+  glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
+  glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
+  glLightfv(GL_LIGHT0, GL_POSITION, position0);
+  glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
+  glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
+  glLightfv(GL_LIGHT1, GL_POSITION, position1);
+
+  glLightModelfv(GL_LIGHT_MODEL_AMBIENT, spotlight_ambient);
+  glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
+  glEnable(GL_LIGHTING);
+  glEnable(GL_LIGHT0);
+  glEnable(GL_LIGHT1);
+
+  /* setup spotlight */
+  glLightfv(GL_LIGHT2, GL_AMBIENT, spotlight_ambient);
+  glLightfv(GL_LIGHT2, GL_DIFFUSE, spotlight_diffuse);
+  glLightf(GL_LIGHT2, GL_CONSTANT_ATTENUATION, 0.1);
+  glLightf(GL_LIGHT2, GL_LINEAR_ATTENUATION, 0.05);
+  glLightf(GL_LIGHT2, GL_QUADRATIC_ATTENUATION, 0.0);
+  glLightf(GL_LIGHT2, GL_SPOT_CUTOFF, 60.0);
+  glLightf(GL_LIGHT2, GL_SPOT_EXPONENT, 3.0);
+
+  glEnable(GL_NORMALIZE);
+  glFrontFace(GL_CCW);
+  glCullFace(GL_BACK);
+
+  /* setup material properties */
+  glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_shininess);
+  glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_specular);
+
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+  glShadeModel(GL_SMOOTH);
+/*   glShadeModel(GL_FLAT); */
+  glEnable(GL_DEPTH_TEST);
+}
+
+#define MAX_MAGNIFICATION 10
+#define max(a, b) a < b ? b : a
+#define min(a, b) a < b ? a : b
+
+/* event handling */
+ENTRYPOINT Bool antspotlight_handle_event(ModeInfo *mi, XEvent *event)
+{
+  antspotlightstruct *mp = &antspotlight[MI_SCREEN(mi)];
+
+  if (gltrackball_event_handler (event, mp->trackball,
+                                 MI_WIDTH (mi), MI_HEIGHT (mi),
+                                 &mp->button_down_p))
+    return True;
+
+  if (event->xany.type == ButtonPress)
+    {
+      switch(event->xbutton.button) {
+
+      case Button1:
+        mp->button_down_p = True;
+        gltrackball_start(mp->trackball, 
+                          event->xbutton.x, event->xbutton.y,
+                          MI_WIDTH (mi), MI_HEIGHT (mi));
+        return True;
+      
+      case Button4:
+        mp->mag = max(mp->mag-1, 1);
+        return True;
+
+      case Button5:
+        mp->mag = min(mp->mag+1, MAX_MAGNIFICATION);
+        return True;
+      }
+    }
+
+  return False;
+}
+
+static void
+image_loaded_cb (const char *filename, XRectangle *geometry,
+                 int image_width, int image_height, 
+                 int texture_width, int texture_height,
+                 void *closure)
+{
+  antspotlightstruct *mp = (antspotlightstruct *) closure;
+
+  mp->max_tx = (GLfloat) image_width  / texture_width;
+  mp->max_ty = (GLfloat) image_height / texture_height;
+
+  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+                   (mp->mipmap_p ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR));
+
+  mp->waiting_for_image_p = False;
+}
+
+
+/* get screenshot */
+static void get_snapshot(ModeInfo *modeinfo)
+{
+  antspotlightstruct *mp = &antspotlight[MI_SCREEN(modeinfo)];
+
+  if (MI_IS_WIREFRAME(modeinfo))
+    return;
+
+  mp->waiting_for_image_p = True;
+  mp->mipmap_p = True;
+  load_texture_async (modeinfo->xgwa.screen, modeinfo->window,
+                      *mp->glx_context, 0, 0, mp->mipmap_p, 
+                      mp->screentexture, image_loaded_cb, mp);
+}
+
+
+ENTRYPOINT void init_antspotlight(ModeInfo *mi)
+{
+  double rot_speed = 0.3;
+
+  antspotlightstruct *mp;
+  
+  MI_INIT(mi, antspotlight);
+  mp = &antspotlight[MI_SCREEN(mi)];
+  mp->rot = make_rotator (rot_speed, rot_speed, rot_speed, 1, 0, True);
+  mp->trackball = gltrackball_init (False);
+
+  if((mp->glx_context = init_GL(mi)) != NULL) {
+    reshape_antspotlight(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
+    glDrawBuffer(GL_BACK);
+    pinit();
+  }
+  else
+    MI_CLEARWINDOW(mi);
+
+  glGenTextures(1, &mp->screentexture);
+  glBindTexture(GL_TEXTURE_2D, mp->screentexture);
+  get_snapshot(mi);
+
+  build_ant(mp);
+  mp->mono = MI_IS_MONO(mi);
+  mp->wire = MI_IS_WIREFRAME(mi);
+  mp->boardsize = 8.0;
+  mp->mag = 1;
+}
+
+ENTRYPOINT void draw_antspotlight(ModeInfo * mi)
+{
+  antspotlightstruct *mp;
+  
+  Display    *display = MI_DISPLAY(mi);
+  Window      window = MI_WINDOW(mi);
+  
+  if(!antspotlight)
+	return;
+  mp = &antspotlight[MI_SCREEN(mi)];
+  
+  MI_IS_DRAWN(mi) = True;
+  
+  if(!mp->glx_context)
+	return;
+  
+  mi->polygon_count = 0;
+
+  /* Just keep running before the texture has come in. */
+  /* if (mp->waiting_for_image_p) return; */
+
+  glXMakeCurrent(display, window, *(mp->glx_context));
+  
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  
+  glPushMatrix();
+  glRotatef(current_device_rotation(), 0, 0, 1);
+
+  /* position camera */
+
+  /* follow focused ant */
+  glTranslatef(0.0, 0.0, -6.0 - mp->mag);
+  glRotatef(35.0, 1.0, 0.0, 0.0);
+  gltrackball_rotate(mp->trackball);
+  glTranslatef(-mp->ant->position[0], mp->ant->position[1], -mp->ant->position[2]);
+
+  /* stable position */
+/*   glTranslatef(0.0, 0.0, -10.0 - mag); */
+/*   gltrackball_rotate(mp->trackball); */
+/*   glRotatef(40.0, 1.0, 0.0, 0.0); */
+/*   glRotatef(20.0, 0.0, 1.0, 0.0); */
+
+  draw_antspotlight_strip(mi);
+
+  ++mp->ticks;
+  
+  glPopMatrix();
+  
+  if (MI_IS_FPS(mi)) do_fps (mi);
+  glFlush();
+  
+  glXSwapBuffers(display, window);
+}
+
+#ifndef STANDALONE
+ENTRYPOINT void change_antspotlight(ModeInfo * mi)
+{
+  antspotlightstruct *mp = &antspotlight[MI_SCREEN(mi)];
+  
+  if (!mp->glx_context)
+	return;
+  
+  glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(mp->glx_context));
+  pinit();
+}
+#endif /* !STANDALONE */
+
+XSCREENSAVER_MODULE ("AntSpotlight", antspotlight)