initial check-in

1 files changed, 908 insertions, 0 deletions

diff --git a/progs/demos/ray.c b/progs/demos/ray.c
new file mode 100644
index 00000000000..24f27a05393
--- /dev/null
+++ b/progs/demos/ray.c
@@ -0,0 +1,908 @@
+/*
+ * This program is under the GNU GPL.
+ * Use at your own risk.
+ *
+ * written by David Bucciarelli ([email protected])
+ *            Humanware s.r.l.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+#include <GL/glut.h>
+
+#ifdef XMESA
+#include "GL/xmesa.h"
+static int fullscreen = 1;
+#endif
+
+static int WIDTH = 640;
+static int HEIGHT = 480;
+
+#define FRAME 50
+
+#define BASESIZE 7.5f
+#define SPHERE_RADIUS 0.75f
+
+#define TEX_CHECK_WIDTH 256
+#define TEX_CHECK_HEIGHT 256
+#define TEX_CHECK_SLOT_SIZE (TEX_CHECK_HEIGHT/16)
+#define TEX_CHECK_NUMSLOT (TEX_CHECK_HEIGHT/TEX_CHECK_SLOT_SIZE)
+
+#define TEX_REFLECT_WIDTH 256
+#define TEX_REFLECT_HEIGHT 256
+#define TEX_REFLECT_SLOT_SIZE (TEX_REFLECT_HEIGHT/16)
+#define TEX_REFLECT_NUMSLOT (TEX_REFLECT_HEIGHT/TEX_REFLECT_SLOT_SIZE)
+
+#ifndef M_PI
+#define M_PI 3.1415926535
+#endif
+
+#define EPSILON 0.0001
+
+#define clamp255(a)  ( (a)<(0.0f) ? (0.0f) : ((a)>(255.0f) ? (255.0f) : (a)) )
+
+#define fabs(x) ((x)<0.0f?-(x):(x))
+
+#define vequ(a,b) { (a)[0]=(b)[0]; (a)[1]=(b)[1]; (a)[2]=(b)[2]; }
+#define vsub(a,b,c) { (a)[0]=(b)[0]-(c)[0]; (a)[1]=(b)[1]-(c)[1]; (a)[2]=(b)[2]-(c)[2]; }
+#define	dprod(a,b) ((a)[0]*(b)[0]+(a)[1]*(b)[1]+(a)[2]*(b)[2])
+#define vnormalize(a,b) { \
+  register float m_norm; \
+  m_norm=sqrt((double)dprod((a),(a))); \
+  (a)[0] /=m_norm; \
+  (a)[1] /=m_norm; \
+  (a)[2] /=m_norm; }
+
+static GLubyte checkmap[TEX_CHECK_HEIGHT][TEX_CHECK_WIDTH][3];
+static GLuint checkid;
+static int checkmap_currentslot = 0;
+
+static GLubyte reflectmap[TEX_REFLECT_HEIGHT][TEX_REFLECT_WIDTH][3];
+static GLuint reflectid;
+static int reflectmap_currentslot = 0;
+
+static GLuint lightdlist;
+static GLuint objdlist;
+
+static float lightpos[3] = { 2.1, 2.1, 2.8 };
+static float objpos[3] = { 0.0, 0.0, 1.0 };
+
+static float sphere_pos[TEX_CHECK_HEIGHT][TEX_REFLECT_WIDTH][3];
+
+static int win = 0;
+
+static float fogcolor[4] = { 0.05, 0.05, 0.05, 1.0 };
+
+static float obs[3] = { 7.0, 0.0, 2.0 };
+static float dir[3];
+static float v = 0.0;
+static float alpha = -90.0;
+static float beta = 90.0;
+
+static int fog = 1;
+static int bfcull = 1;
+static int poutline = 0;
+static int help = 1;
+static int showcheckmap = 1;
+static int showreflectmap = 1;
+static int joyavailable = 0;
+static int joyactive = 0;
+
+static float
+gettime(void)
+{
+   static float told = 0.0f;
+   float tnew, ris;
+
+   tnew = glutGet(GLUT_ELAPSED_TIME);
+
+   ris = tnew - told;
+
+   told = tnew;
+
+   return ris / 1000.0;
+}
+
+static void
+calcposobs(void)
+{
+   dir[0] = sin(alpha * M_PI / 180.0);
+   dir[1] = cos(alpha * M_PI / 180.0) * sin(beta * M_PI / 180.0);
+   dir[2] = cos(beta * M_PI / 180.0);
+
+   obs[0] += v * dir[0];
+   obs[1] += v * dir[1];
+   obs[2] += v * dir[2];
+}
+
+static void
+special(int k, int x, int y)
+{
+   switch (k) {
+   case GLUT_KEY_LEFT:
+      alpha -= 2.0;
+      break;
+   case GLUT_KEY_RIGHT:
+      alpha += 2.0;
+      break;
+   case GLUT_KEY_DOWN:
+      beta -= 2.0;
+      break;
+   case GLUT_KEY_UP:
+      beta += 2.0;
+      break;
+   }
+}
+
+static void
+key(unsigned char k, int x, int y)
+{
+   switch (k) {
+   case 27:
+      exit(0);
+      break;
+
+   case 's':
+      lightpos[1] -= 0.1;
+      break;
+   case 'd':
+      lightpos[1] += 0.1;
+      break;
+   case 'e':
+      lightpos[0] -= 0.1;
+      break;
+   case 'x':
+      lightpos[0] += 0.1;
+      break;
+   case 'w':
+      lightpos[2] -= 0.1;
+      break;
+   case 'r':
+      lightpos[2] += 0.1;
+      break;
+
+   case 'j':
+      objpos[1] -= 0.1;
+      break;
+   case 'k':
+      objpos[1] += 0.1;
+      break;
+   case 'i':
+      objpos[0] -= 0.1;
+      break;
+   case 'm':
+      objpos[0] += 0.1;
+      break;
+   case 'u':
+      objpos[2] -= 0.1;
+      break;
+   case 'o':
+      objpos[2] += 0.1;
+      break;
+
+   case 'a':
+      v += 0.005;
+      break;
+   case 'z':
+      v -= 0.005;
+      break;
+
+   case 'g':
+      joyactive = (!joyactive);
+      break;
+   case 'h':
+      help = (!help);
+      break;
+   case 'f':
+      fog = (!fog);
+      break;
+
+   case '1':
+      showcheckmap = (!showcheckmap);
+      break;
+   case '2':
+      showreflectmap = (!showreflectmap);
+      break;
+
+   case 'b':
+      if (bfcull) {
+	 glDisable(GL_CULL_FACE);
+	 bfcull = 0;
+      }
+      else {
+	 glEnable(GL_CULL_FACE);
+	 bfcull = 1;
+      }
+      break;
+   case 'p':
+      if (poutline) {
+	 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+	 poutline = 0;
+      }
+      else {
+	 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	 poutline = 1;
+      }
+      break;
+#ifdef XMESA
+   case ' ':
+      XMesaSetFXmode(fullscreen ? XMESA_FX_FULLSCREEN : XMESA_FX_WINDOW);
+      fullscreen = (!fullscreen);
+      break;
+#endif
+   }
+}
+
+static void
+reshape(int w, int h)
+{
+   WIDTH = w;
+   HEIGHT = h;
+   glViewport(0, 0, w, h);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   gluPerspective(45.0, w / (float) h, 0.8, 40.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+static void
+printstring(void *font, char *string)
+{
+   int len, i;
+
+   len = (int) strlen(string);
+   for (i = 0; i < len; i++)
+      glutBitmapCharacter(font, string[i]);
+}
+
+static void
+printhelp(void)
+{
+   glEnable(GL_BLEND);
+   glColor4f(0.5, 0.5, 0.5, 0.5);
+   glRecti(40, 40, 600, 440);
+   glDisable(GL_BLEND);
+
+   glColor3f(0.0, 0.0, 1.0);
+   glRasterPos2i(300, 420);
+   printstring(GLUT_BITMAP_HELVETICA_18, "Help");
+
+   glRasterPos2i(60, 390);
+   printstring(GLUT_BITMAP_HELVETICA_12, "h - Togle Help");
+   glRasterPos2i(60, 370);
+   printstring(GLUT_BITMAP_HELVETICA_12, "f - Togle Fog");
+   glRasterPos2i(60, 350);
+   printstring(GLUT_BITMAP_HELVETICA_12, "b - Togle Back face culling");
+   glRasterPos2i(60, 330);
+   printstring(GLUT_BITMAP_HELVETICA_12, "p - Togle Wire frame");
+   glRasterPos2i(60, 310);
+   printstring(GLUT_BITMAP_HELVETICA_12, "Arrow Keys - Rotate");
+   glRasterPos2i(60, 290);
+   printstring(GLUT_BITMAP_HELVETICA_12, "a - Increase velocity");
+   glRasterPos2i(60, 270);
+   printstring(GLUT_BITMAP_HELVETICA_12, "z - Decrease velocity");
+
+   glRasterPos2i(60, 250);
+   if (joyavailable)
+      printstring(GLUT_BITMAP_HELVETICA_12,
+		  "j - Togle jostick control (Joystick control available)");
+   else
+      printstring(GLUT_BITMAP_HELVETICA_12,
+		  "(No Joystick control available)");
+
+   glRasterPos2i(60, 230);
+   printstring(GLUT_BITMAP_HELVETICA_12,
+	       "To move the light source: s - left,  d - right,  e - far,  x - near,  w - down r - up");
+   glRasterPos2i(60, 210);
+   printstring(GLUT_BITMAP_HELVETICA_12,
+	       "To move the mirror sphere: j - left,  k - right,  i - far,  m - near,  u - down o - up");
+
+   glRasterPos2i(60, 190);
+   printstring(GLUT_BITMAP_HELVETICA_12,
+	       "1 - Togle the plane texture map window");
+
+   glRasterPos2i(60, 170);
+   printstring(GLUT_BITMAP_HELVETICA_12,
+	       "2 - Togle the sphere texture map window");
+}
+
+static GLboolean
+seelight(float p[3], float dir[3])
+{
+   float c[3], b, a, d, t, dist[3];
+
+   vsub(c, p, objpos);
+   b = -dprod(c, dir);
+   a = dprod(c, c) - SPHERE_RADIUS * SPHERE_RADIUS;
+
+   if ((d = b * b - a) < 0.0 || (b < 0.0 && a > 0.0))
+      return GL_FALSE;
+
+   d = sqrt(d);
+
+   t = b - d;
+
+   if (t < EPSILON) {
+      t = b + d;
+      if (t < EPSILON)
+	 return GL_FALSE;
+   }
+
+   vsub(dist, lightpos, p);
+   if (dprod(dist, dist) < t * t)
+      return GL_FALSE;
+
+   return GL_TRUE;
+}
+
+static int
+colorcheckmap(float ppos[3], float c[3])
+{
+   static float norm[3] = { 0.0f, 0.0f, 1.0f };
+   float ldir[3], vdir[3], h[3], dfact, kfact, r, g, b;
+   int x, y;
+
+   x = (int) ((ppos[0] + BASESIZE / 2) * (10.0f / BASESIZE));
+   if ((x < 0) || (x > 10))
+      return GL_FALSE;
+
+   y = (int) ((ppos[1] + BASESIZE / 2) * (10.0f / BASESIZE));
+   if ((y < 0) || (y > 10))
+      return GL_FALSE;
+
+   r = 255.0f;
+   if (y & 1) {
+      if (x & 1)
+	 g = 255.0f;
+      else
+	 g = 0.0f;
+   }
+   else {
+      if (x & 1)
+	 g = 0.0f;
+      else
+	 g = 255.0f;
+   }
+   b = 0.0f;
+
+   vsub(ldir, lightpos, ppos);
+   vnormalize(ldir, ldir);
+
+   if (seelight(ppos, ldir)) {
+      c[0] = r * 0.05f;
+      c[1] = g * 0.05f;
+      c[2] = b * 0.05f;
+
+      return GL_TRUE;
+   }
+
+   dfact = dprod(ldir, norm);
+   if (dfact < 0.0f)
+      dfact = 0.0f;
+
+   vsub(vdir, obs, ppos);
+   vnormalize(vdir, vdir);
+   h[0] = 0.5f * (vdir[0] + ldir[0]);
+   h[1] = 0.5f * (vdir[1] + ldir[1]);
+   h[2] = 0.5f * (vdir[2] + ldir[2]);
+   kfact = dprod(h, norm);
+   kfact =
+      kfact * kfact * kfact * kfact * kfact * kfact * kfact * 7.0f * 255.0f;
+
+   r = r * dfact + kfact;
+   g = g * dfact + kfact;
+   b = b * dfact + kfact;
+
+   c[0] = clamp255(r);
+   c[1] = clamp255(g);
+   c[2] = clamp255(b);
+
+   return GL_TRUE;
+}
+
+static void
+updatecheckmap(int slot)
+{
+   float c[3], ppos[3];
+   int x, y;
+
+   glBindTexture(GL_TEXTURE_2D, checkid);
+
+   ppos[2] = 0.0f;
+   for (y = slot * TEX_CHECK_SLOT_SIZE; y < (slot + 1) * TEX_CHECK_SLOT_SIZE;
+	y++) {
+      ppos[1] = (y / (float) TEX_CHECK_HEIGHT) * BASESIZE - BASESIZE / 2;
+
+      for (x = 0; x < TEX_CHECK_WIDTH; x++) {
+	 ppos[0] = (x / (float) TEX_CHECK_WIDTH) * BASESIZE - BASESIZE / 2;
+
+	 colorcheckmap(ppos, c);
+	 checkmap[y][x][0] = (GLubyte) c[0];
+	 checkmap[y][x][1] = (GLubyte) c[1];
+	 checkmap[y][x][2] = (GLubyte) c[2];
+      }
+   }
+
+   glTexSubImage2D(GL_TEXTURE_2D, 0, 0, slot * TEX_CHECK_SLOT_SIZE,
+		   TEX_CHECK_WIDTH, TEX_CHECK_SLOT_SIZE, GL_RGB,
+		   GL_UNSIGNED_BYTE,
+		   &checkmap[slot * TEX_CHECK_SLOT_SIZE][0][0]);
+
+}
+
+static void
+updatereflectmap(int slot)
+{
+   float rf, r, g, b, t, dfact, kfact, rdir[3];
+   float rcol[3], ppos[3], norm[3], ldir[3], h[3], vdir[3], planepos[3];
+   int x, y;
+
+   glBindTexture(GL_TEXTURE_2D, reflectid);
+
+   for (y = slot * TEX_REFLECT_SLOT_SIZE;
+	y < (slot + 1) * TEX_REFLECT_SLOT_SIZE; y++)
+      for (x = 0; x < TEX_REFLECT_WIDTH; x++) {
+	 ppos[0] = sphere_pos[y][x][0] + objpos[0];
+	 ppos[1] = sphere_pos[y][x][1] + objpos[1];
+	 ppos[2] = sphere_pos[y][x][2] + objpos[2];
+
+	 vsub(norm, ppos, objpos);
+	 vnormalize(norm, norm);
+
+	 vsub(ldir, lightpos, ppos);
+	 vnormalize(ldir, ldir);
+	 vsub(vdir, obs, ppos);
+	 vnormalize(vdir, vdir);
+
+	 rf = 2.0f * dprod(norm, vdir);
+	 if (rf > EPSILON) {
+	    rdir[0] = rf * norm[0] - vdir[0];
+	    rdir[1] = rf * norm[1] - vdir[1];
+	    rdir[2] = rf * norm[2] - vdir[2];
+
+	    t = -objpos[2] / rdir[2];
+
+	    if (t > EPSILON) {
+	       planepos[0] = objpos[0] + t * rdir[0];
+	       planepos[1] = objpos[1] + t * rdir[1];
+	       planepos[2] = 0.0f;
+
+	       if (!colorcheckmap(planepos, rcol))
+		  rcol[0] = rcol[1] = rcol[2] = 0.0f;
+	    }
+	    else
+	       rcol[0] = rcol[1] = rcol[2] = 0.0f;
+	 }
+	 else
+	    rcol[0] = rcol[1] = rcol[2] = 0.0f;
+
+	 dfact = 0.1f * dprod(ldir, norm);
+
+	 if (dfact < 0.0f) {
+	    dfact = 0.0f;
+	    kfact = 0.0f;
+	 }
+	 else {
+	    h[0] = 0.5f * (vdir[0] + ldir[0]);
+	    h[1] = 0.5f * (vdir[1] + ldir[1]);
+	    h[2] = 0.5f * (vdir[2] + ldir[2]);
+	    kfact = dprod(h, norm);
+	    kfact *= kfact;
+	    kfact *= kfact;
+	    kfact *= kfact;
+	    kfact *= kfact;
+	    kfact *= 10.0f;
+	 }
+
+	 r = dfact + kfact;
+	 g = dfact + kfact;
+	 b = dfact + kfact;
+
+	 r *= 255.0f;
+	 g *= 255.0f;
+	 b *= 255.0f;
+
+	 r += rcol[0];
+	 g += rcol[1];
+	 b += rcol[2];
+
+	 r = clamp255(r);
+	 g = clamp255(g);
+	 b = clamp255(b);
+
+	 reflectmap[y][x][0] = (GLubyte) r;
+	 reflectmap[y][x][1] = (GLubyte) g;
+	 reflectmap[y][x][2] = (GLubyte) b;
+      }
+
+   glTexSubImage2D(GL_TEXTURE_2D, 0, 0, slot * TEX_REFLECT_SLOT_SIZE,
+		   TEX_REFLECT_WIDTH, TEX_REFLECT_SLOT_SIZE, GL_RGB,
+		   GL_UNSIGNED_BYTE,
+		   &reflectmap[slot * TEX_REFLECT_SLOT_SIZE][0][0]);
+}
+
+static void
+drawbase(void)
+{
+   glColor3f(0.0, 0.0, 0.0);
+   glBindTexture(GL_TEXTURE_2D, checkid);
+   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+   glBegin(GL_QUADS);
+   glTexCoord2f(0.0f, 0.0f);
+   glVertex3f(-BASESIZE / 2.0f, -BASESIZE / 2.0f, 0.0f);
+
+   glTexCoord2f(1.0f, 0.0f);
+   glVertex3f(BASESIZE / 2.0f, -BASESIZE / 2.0f, 0.0f);
+
+   glTexCoord2f(1.0f, 1.0f);
+   glVertex3f(BASESIZE / 2.0f, BASESIZE / 2.0f, 0.0f);
+
+   glTexCoord2f(0.0f, 1.0f);
+   glVertex3f(-BASESIZE / 2.0f, BASESIZE / 2.0f, 0.0f);
+
+   glEnd();
+}
+
+static void
+drawobj(void)
+{
+   glColor3f(0.0, 0.0, 0.0);
+   glBindTexture(GL_TEXTURE_2D, reflectid);
+   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+   glPushMatrix();
+   glTranslatef(objpos[0], objpos[1], objpos[2]);
+   glCallList(objdlist);
+   glPopMatrix();
+}
+
+static void
+dojoy(void)
+{
+#ifdef WIN32
+   static UINT max[2] = { 0, 0 };
+   static UINT min[2] = { 0xffffffff, 0xffffffff }, center[2];
+   MMRESULT res;
+   JOYINFO joy;
+
+   res = joyGetPos(JOYSTICKID1, &joy);
+
+   if (res == JOYERR_NOERROR) {
+      joyavailable = 1;
+
+      if (max[0] < joy.wXpos)
+	 max[0] = joy.wXpos;
+      if (min[0] > joy.wXpos)
+	 min[0] = joy.wXpos;
+      center[0] = (max[0] + min[0]) / 2;
+
+      if (max[1] < joy.wYpos)
+	 max[1] = joy.wYpos;
+      if (min[1] > joy.wYpos)
+	 min[1] = joy.wYpos;
+      center[1] = (max[1] + min[1]) / 2;
+
+      if (joyactive) {
+	 if (fabs(center[0] - (float) joy.wXpos) > 0.1 * (max[0] - min[0]))
+	    alpha -=
+	       2.5 * (center[0] - (float) joy.wXpos) / (max[0] - min[0]);
+	 if (fabs(center[1] - (float) joy.wYpos) > 0.1 * (max[1] - min[1]))
+	    beta += 2.5 * (center[1] - (float) joy.wYpos) / (max[1] - min[1]);
+
+	 if (joy.wButtons & JOY_BUTTON1)
+	    v += 0.005;
+	 if (joy.wButtons & JOY_BUTTON2)
+	    v -= 0.005;
+      }
+   }
+   else
+      joyavailable = 0;
+#endif
+}
+
+static void
+updatemaps(void)
+{
+   updatecheckmap(checkmap_currentslot);
+   checkmap_currentslot = (checkmap_currentslot + 1) % TEX_CHECK_NUMSLOT;
+
+   updatereflectmap(reflectmap_currentslot);
+   reflectmap_currentslot =
+      (reflectmap_currentslot + 1) % TEX_REFLECT_NUMSLOT;
+}
+
+static void
+draw(void)
+{
+   static int count = 0;
+   static char frbuf[80];
+   float fr;
+
+   dojoy();
+
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glEnable(GL_TEXTURE_2D);
+   glEnable(GL_DEPTH_TEST);
+   if (fog)
+      glEnable(GL_FOG);
+   else
+      glDisable(GL_FOG);
+
+   glPushMatrix();
+   calcposobs();
+
+   gluLookAt(obs[0], obs[1], obs[2],
+	     obs[0] + dir[0], obs[1] + dir[1], obs[2] + dir[2],
+	     0.0, 0.0, 1.0);
+
+   drawbase();
+   drawobj();
+
+   glColor3f(1.0, 1.0, 1.0);
+   glDisable(GL_TEXTURE_2D);
+
+   glPushMatrix();
+   glTranslatef(lightpos[0], lightpos[1], lightpos[2]);
+   glCallList(lightdlist);
+   glPopMatrix();
+
+   glPopMatrix();
+
+   if ((count % FRAME) == 0) {
+      fr = gettime();
+      sprintf(frbuf, "Frame rate: %f", FRAME / fr);
+   }
+
+   glDisable(GL_DEPTH_TEST);
+   glDisable(GL_FOG);
+
+   glMatrixMode(GL_PROJECTION);
+   glPushMatrix();
+   glLoadIdentity();
+   glOrtho(-0.5, 639.5, -0.5, 479.5, -1.0, 1.0);
+   glMatrixMode(GL_MODELVIEW);
+
+   glColor3f(0.0f, 0.3f, 1.0f);
+
+   if (showcheckmap) {
+      glEnable(GL_TEXTURE_2D);
+      glBindTexture(GL_TEXTURE_2D, checkid);
+      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+      glBegin(GL_QUADS);
+      glTexCoord2f(1.0f, 0.0f);
+      glVertex2i(10, 30);
+      glTexCoord2f(1.0f, 1.0f);
+      glVertex2i(10 + 90, 30);
+      glTexCoord2f(0.0f, 1.0f);
+      glVertex2i(10 + 90, 30 + 90);
+      glTexCoord2f(0.0f, 0.0f);
+      glVertex2i(10, 30 + 90);
+      glEnd();
+
+      glDisable(GL_TEXTURE_2D);
+      glBegin(GL_LINE_LOOP);
+      glVertex2i(10, 30);
+      glVertex2i(10 + 90, 30);
+      glVertex2i(10 + 90, 30 + 90);
+      glVertex2i(10, 30 + 90);
+      glEnd();
+      glRasterPos2i(105, 65);
+      printstring(GLUT_BITMAP_HELVETICA_18, "Plane Texture Map");
+   }
+
+   if (showreflectmap) {
+      glEnable(GL_TEXTURE_2D);
+      glBindTexture(GL_TEXTURE_2D, reflectid);
+      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+      glBegin(GL_QUADS);
+      glTexCoord2f(1.0f, 0.0f);
+      glVertex2i(540, 30);
+      glTexCoord2f(1.0f, 1.0f);
+      glVertex2i(540 + 90, 30);
+      glTexCoord2f(0.0f, 1.0f);
+      glVertex2i(540 + 90, 30 + 90);
+      glTexCoord2f(0.0f, 0.0f);
+      glVertex2i(540, 30 + 90);
+      glEnd();
+
+      glDisable(GL_TEXTURE_2D);
+      glBegin(GL_LINE_LOOP);
+      glVertex2i(540, 30);
+      glVertex2i(540 + 90, 30);
+      glVertex2i(540 + 90, 30 + 90);
+      glVertex2i(540, 30 + 90);
+      glEnd();
+      glRasterPos2i(360, 65);
+      printstring(GLUT_BITMAP_HELVETICA_18, "Sphere Texture Map");
+   }
+
+   glDisable(GL_TEXTURE_2D);
+
+   glRasterPos2i(10, 10);
+   printstring(GLUT_BITMAP_HELVETICA_18, frbuf);
+   glRasterPos2i(360, 470);
+   printstring(GLUT_BITMAP_HELVETICA_10,
+	       "Ray V1.0 Written by David Bucciarelli ([email protected])");
+
+   if (help)
+      printhelp();
+
+   glMatrixMode(GL_PROJECTION);
+   glPopMatrix();
+   glMatrixMode(GL_MODELVIEW);
+
+   updatemaps();
+
+   glutSwapBuffers();
+
+   count++;
+}
+
+static void
+inittextures(void)
+{
+   int y;
+
+   glGenTextures(1, &checkid);
+   glBindTexture(GL_TEXTURE_2D, checkid);
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   glTexImage2D(GL_TEXTURE_2D, 0, 3, TEX_CHECK_WIDTH, TEX_CHECK_HEIGHT,
+		0, GL_RGB, GL_UNSIGNED_BYTE, checkmap);
+
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+   for (y = 0; y < TEX_CHECK_NUMSLOT; y++)
+      updatecheckmap(y);
+
+
+
+   glGenTextures(1, &reflectid);
+   glBindTexture(GL_TEXTURE_2D, reflectid);
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   glTexImage2D(GL_TEXTURE_2D, 0, 3, TEX_REFLECT_WIDTH, TEX_REFLECT_HEIGHT,
+		0, GL_RGB, GL_UNSIGNED_BYTE, reflectmap);
+
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+   for (y = 0; y < TEX_REFLECT_NUMSLOT; y++)
+      updatereflectmap(y);
+
+
+}
+
+static void
+initspherepos(void)
+{
+   float alpha, beta, sa, ca, sb, cb;
+   int x, y;
+
+   for (y = 0; y < TEX_REFLECT_HEIGHT; y++) {
+      beta = M_PI - y * (M_PI / TEX_REFLECT_HEIGHT);
+
+      for (x = 0; x < TEX_REFLECT_WIDTH; x++) {
+	 alpha = -x * (2.0f * M_PI / TEX_REFLECT_WIDTH);
+
+	 sa = sin(alpha);
+	 ca = cos(alpha);
+
+	 sb = sin(beta);
+	 cb = cos(beta);
+
+	 sphere_pos[y][x][0] = SPHERE_RADIUS * sa * sb;
+	 sphere_pos[y][x][1] = SPHERE_RADIUS * ca * sb;
+	 sphere_pos[y][x][2] = SPHERE_RADIUS * cb;
+      }
+   }
+}
+
+static void
+initdlists(void)
+{
+   GLUquadricObj *obj;
+
+   obj = gluNewQuadric();
+
+   lightdlist = glGenLists(1);
+   glNewList(lightdlist, GL_COMPILE);
+   gluQuadricDrawStyle(obj, GLU_FILL);
+   gluQuadricNormals(obj, GLU_NONE);
+   gluQuadricTexture(obj, GL_TRUE);
+   gluSphere(obj, 0.25f, 6, 6);
+   glEndList();
+
+   objdlist = glGenLists(1);
+   glNewList(objdlist, GL_COMPILE);
+   gluQuadricDrawStyle(obj, GLU_FILL);
+   gluQuadricNormals(obj, GLU_NONE);
+   gluQuadricTexture(obj, GL_TRUE);
+   gluSphere(obj, SPHERE_RADIUS, 16, 16);
+   glEndList();
+}
+
+int
+main(int ac, char **av)
+{
+   fprintf(stderr,
+	   "Ray V1.0\nWritten by David Bucciarelli ([email protected])\n");
+
+   /*
+      if(!SetPriorityClass(GetCurrentProcess(),REALTIME_PRIORITY_CLASS)) {
+      fprintf(stderr,"Error setting the process class.\n");
+      return 0;
+      }
+
+      if(!SetThreadPriority(GetCurrentThread(),THREAD_PRIORITY_TIME_CRITICAL)) {
+      fprintf(stderr,"Error setting the process priority.\n");
+      return 0;
+      }
+    */
+
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(WIDTH, HEIGHT);
+   glutInit(&ac, av);
+
+   glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
+
+   if (!(win = glutCreateWindow("Ray"))) {
+      fprintf(stderr, "Error, couldn't open window\n");
+      return -1;
+   }
+
+   reshape(WIDTH, HEIGHT);
+
+   glShadeModel(GL_FLAT);
+   glEnable(GL_DEPTH_TEST);
+   glDepthFunc(GL_LEQUAL);
+   glEnable(GL_CULL_FACE);
+   glEnable(GL_TEXTURE_2D);
+   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+   glEnable(GL_FOG);
+   glFogi(GL_FOG_MODE, GL_EXP2);
+   glFogfv(GL_FOG_COLOR, fogcolor);
+
+   glFogf(GL_FOG_DENSITY, 0.01);
+#ifdef FX
+   glHint(GL_FOG_HINT, GL_NICEST);
+#endif
+
+   calcposobs();
+
+   initspherepos();
+
+   inittextures();
+   initdlists();
+
+   glClearColor(fogcolor[0], fogcolor[1], fogcolor[2], fogcolor[3]);
+
+   glutReshapeFunc(reshape);
+   glutDisplayFunc(draw);
+   glutKeyboardFunc(key);
+   glutSpecialFunc(special);
+   glutIdleFunc(draw);
+
+   glutMainLoop();
+
+   return 0;
+}