initial check-in

1 files changed, 653 insertions, 0 deletions

diff --git a/progs/demos/terrain.c b/progs/demos/terrain.c
new file mode 100644
index 00000000000..b708ff826de
--- /dev/null
+++ b/progs/demos/terrain.c
@@ -0,0 +1,653 @@
+/*
+ * This program is under the GNU GPL.
+ * Use at your own risk.
+ *
+ * written by David Bucciarelli ([email protected])
+ *            Humanware s.r.l.
+ *
+ * based on a Mikael SkiZoWalker's (MoDEL) / France ([email protected]) demo
+ */
+
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+#include <time.h>
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+#include <GL/glut.h>
+
+#ifdef XMESA
+#include "GL/xmesa.h"
+static int fullscreen = 1;
+#endif
+
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
+
+#define heightMnt	450
+#define	lenghtXmnt	62
+#define lenghtYmnt	62
+
+#define stepXmnt     96.0
+#define stepYmnt     96.0
+
+#define WIDTH 640
+#define HEIGHT 480
+
+#define TSCALE 4
+
+#define	FRAME 50
+
+#define FOV 85
+
+static GLfloat terrain[256 * 256];
+static GLfloat terraincolor[256 * 256][3];
+
+static int win = 0;
+
+static int fog = 1;
+static int bfcull = 1;
+static int usetex = 1;
+static int poutline = 0;
+static int help = 1;
+static int joyavailable = 0;
+static int joyactive = 0;
+static float ModZMnt;
+static long GlobalMnt = 0;
+
+static int scrwidth = WIDTH;
+static int scrheight = HEIGHT;
+
+#define OBSSTARTX 992.0
+#define OBSSTARTY 103.0
+
+static float obs[3] = { OBSSTARTX, heightMnt * 1.3, OBSSTARTY };
+static float dir[3], v1[2], v2[2];
+static float v = 15.0;
+static float alpha = 75.0;
+static float beta = 90.0;
+
+static float
+gettime(void)
+{
+   static clock_t told = 0;
+   clock_t tnew, ris;
+
+   tnew = clock();
+
+   ris = tnew - told;
+
+   told = tnew;
+
+   return (ris / (float) CLOCKS_PER_SEC);
+}
+
+static void
+calcposobs(void)
+{
+   float alpha1, alpha2;
+
+   dir[0] = sin(alpha * M_PI / 180.0);
+   dir[2] = cos(alpha * M_PI / 180.0) * sin(beta * M_PI / 180.0);
+   dir[1] = cos(beta * M_PI / 180.0);
+
+   alpha1 = alpha + FOV / 2.0;
+   v1[0] = sin(alpha1 * M_PI / 180.0);
+   v1[1] = cos(alpha1 * M_PI / 180.0);
+
+   alpha2 = alpha - FOV / 2.0;
+   v2[0] = sin(alpha2 * M_PI / 180.0);
+   v2[1] = cos(alpha2 * M_PI / 180.0);
+
+   obs[0] += v * dir[0];
+   obs[1] += v * dir[1];
+   obs[2] += v * dir[2];
+
+   if (obs[1] < 0.0)
+      obs[1] = 0.0;
+}
+
+static void
+reshape(int width, int height)
+{
+   scrwidth = width;
+   scrheight = height;
+   glViewport(0, 0, (GLint) width, (GLint) height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   gluPerspective(50.0, ((GLfloat) width / (GLfloat) height),
+		  lenghtXmnt * stepYmnt * 0.01, lenghtXmnt * stepYmnt * 0.7);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+int
+clipstrip(float y, float *start, float *end)
+{
+   float x1, x2, t1, t2, tmp;
+
+   if (v1[1] == 0.0) {
+      t1 = 0.0;
+      x1 = -HUGE_VAL;
+   }
+   else {
+      t1 = y / v1[1];
+      x1 = t1 * v1[0];
+   }
+
+   if (v2[1] == 0.0) {
+      t2 = 0.0;
+      x2 = HUGE_VAL;
+   }
+   else {
+      t2 = y / v2[1];
+      x2 = t2 * v2[0];
+   }
+
+   if (((x1 < -(lenghtXmnt * stepXmnt) / 2) && (t2 <= 0.0)) ||
+       ((t1 <= 0.0) && (x2 > (lenghtXmnt * stepXmnt) / 2)) ||
+       ((t1 < 0.0) && (t2 < 0.0)))
+      return 0;
+
+   if ((t1 == 0.0) && (t2 == 0.0)) {
+      if ((v1[0] < 0.0) && (v1[1] > 0.0) && (v2[0] < 0.0) && (v2[1] < 0.0)) {
+	 *start = -(lenghtXmnt * stepXmnt) / 2;
+	 *end = stepXmnt;
+	 return 1;
+      }
+      else {
+	 if ((v1[0] > 0.0) && (v1[1] < 0.0) && (v2[0] > 0.0) && (v2[1] > 0.0)) {
+	    *start = -stepXmnt;
+	    *end = (lenghtXmnt * stepXmnt) / 2;
+	    return 1;
+	 }
+	 else
+	    return 0;
+      }
+   }
+   else {
+      if (t2 < 0.0) {
+	 if (x1 < 0.0)
+	    x2 = -(lenghtXmnt * stepXmnt) / 2;
+	 else
+	    x2 = (lenghtXmnt * stepXmnt) / 2;
+      }
+
+      if (t1 < 0.0) {
+	 if (x2 < 0.0)
+	    x1 = -(lenghtXmnt * stepXmnt) / 2;
+	 else
+	    x1 = (lenghtXmnt * stepXmnt) / 2;
+      }
+   }
+
+   if (x1 > x2) {
+      tmp = x1;
+      x1 = x2;
+      x2 = tmp;
+   }
+
+   x1 -= stepXmnt;
+   if (x1 < -(lenghtXmnt * stepXmnt) / 2)
+      x1 = -(lenghtXmnt * stepXmnt) / 2;
+
+   x2 += stepXmnt;
+   if (x2 > (lenghtXmnt * stepXmnt) / 2)
+      x2 = (lenghtXmnt * stepXmnt) / 2;
+
+   *start = ((int) (x1 / stepXmnt)) * stepXmnt;
+   *end = ((int) (x2 / stepXmnt)) * stepXmnt;
+
+   return 1;
+}
+
+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);
+   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+   glColor4f(0.0, 0.0, 0.0, 0.5);
+   glRecti(40, 40, 600, 440);
+   glDisable(GL_BLEND);
+
+   glColor3f(1.0, 0.0, 0.0);
+   glRasterPos2i(300, 420);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "Help");
+
+   glRasterPos2i(60, 390);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "h - Togle Help");
+   glRasterPos2i(60, 360);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "t - Togle Textures");
+   glRasterPos2i(60, 330);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "f - Togle Fog");
+   glRasterPos2i(60, 300);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "p - Wire frame");
+   glRasterPos2i(60, 270);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "b - Togle Back face culling");
+   glRasterPos2i(60, 240);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "Arrow Keys - Rotate");
+   glRasterPos2i(60, 210);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "a - Increase velocity");
+   glRasterPos2i(60, 180);
+   printstring(GLUT_BITMAP_TIMES_ROMAN_24, "z - Decrease velocity");
+
+   glRasterPos2i(60, 150);
+   if (joyavailable)
+      printstring(GLUT_BITMAP_TIMES_ROMAN_24,
+		  "j - Togle jostick control (Joystick control available)");
+   else
+      printstring(GLUT_BITMAP_TIMES_ROMAN_24,
+		  "(No Joystick control available)");
+}
+
+void
+drawterrain(void)
+{
+   int h, i, idx, ox, oy;
+   float j, k, start, end;
+
+   ox = (int) (obs[0] / stepXmnt);
+   oy = (int) (obs[2] / stepYmnt);
+   GlobalMnt = ((ox * TSCALE) & 255) + ((oy * TSCALE) & 255) * 256;
+
+   glPushMatrix();
+   glTranslatef((float) ox * stepXmnt, 0, (float) oy * stepYmnt);
+
+   for (h = 0, k = -(lenghtYmnt * stepYmnt) / 2; h < lenghtYmnt;
+	k += stepYmnt, h++) {
+      if (!clipstrip(k, &start, &end))
+	 continue;
+
+      glBegin(GL_TRIANGLE_STRIP);	/* I hope that the optimizer will be able to improve this code */
+      for (i = (int) (lenghtXmnt / 2 + start / stepXmnt), j = start; j <= end;
+	   j += stepXmnt, i++) {
+	 idx = (i * TSCALE + h * 256 * TSCALE + GlobalMnt) & 65535;
+	 glColor3fv(terraincolor[idx]);
+	 glTexCoord2f((ox + i) / 8.0, (oy + h) / 8.0);
+	 glVertex3f(j, terrain[idx], k);
+
+	 idx =
+	    (i * TSCALE + h * 256 * TSCALE + 256 * TSCALE +
+	     GlobalMnt) & 65535;
+	 glColor3fv(terraincolor[idx]);
+	 glTexCoord2f((ox + i) / 8.0, (oy + h + 1) / 8.0);
+	 glVertex3f(j, terrain[idx], k + stepYmnt);
+      }
+      glEnd();
+   }
+
+   glDisable(GL_CULL_FACE);
+   glDisable(GL_TEXTURE_2D);
+   glEnable(GL_BLEND);
+   glBegin(GL_QUADS);
+   glColor4f(0.1, 0.7, 1.0, 0.4);
+   glVertex3f(-(lenghtXmnt * stepXmnt) / 2.0, heightMnt * 0.6,
+	      -(lenghtYmnt * stepYmnt) / 2.0);
+   glVertex3f(-(lenghtXmnt * stepXmnt) / 2.0, heightMnt * 0.6,
+	      (lenghtYmnt * stepYmnt) / 2.0);
+   glVertex3f((lenghtXmnt * stepXmnt) / 2.0, heightMnt * 0.6,
+	      (lenghtYmnt * stepYmnt) / 2.0);
+   glVertex3f((lenghtXmnt * stepXmnt) / 2.0, heightMnt * 0.6,
+	      -(lenghtYmnt * stepYmnt) / 2.0);
+   glEnd();
+   glDisable(GL_BLEND);
+   if (bfcull)
+      glEnable(GL_CULL_FACE);
+   glEnable(GL_TEXTURE_2D);
+
+   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 += 0.5;
+	 if (joy.wButtons & JOY_BUTTON2)
+	    v -= 0.5;
+      }
+   }
+   else
+      joyavailable = 0;
+#endif
+}
+
+void
+drawscene(void)
+{
+   static int count = 0;
+   static char frbuf[80];
+   float fr;
+
+   dojoy();
+
+   glShadeModel(GL_SMOOTH);
+   glEnable(GL_DEPTH_TEST);
+
+   if (usetex)
+      glEnable(GL_TEXTURE_2D);
+   else
+      glDisable(GL_TEXTURE_2D);
+
+   if (fog)
+      glEnable(GL_FOG);
+   else
+      glDisable(GL_FOG);
+
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glPushMatrix();
+
+   calcposobs();
+   gluLookAt(obs[0], obs[1], obs[2],
+	     obs[0] + dir[0], obs[1] + dir[1], obs[2] + dir[2],
+	     0.0, 1.0, 0.0);
+
+   drawterrain();
+   glPopMatrix();
+
+   if ((count % FRAME) == 0) {
+      fr = gettime();
+      sprintf(frbuf, "Frame rate: %.3f", FRAME / fr);
+   }
+
+   glDisable(GL_TEXTURE_2D);
+   glDisable(GL_DEPTH_TEST);
+   glDisable(GL_FOG);
+   glShadeModel(GL_FLAT);
+
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glOrtho(-0.5, 639.5, -0.5, 479.5, -1.0, 1.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+
+   glColor3f(1.0, 0.0, 0.0);
+   glRasterPos2i(10, 10);
+   printstring(GLUT_BITMAP_HELVETICA_18, frbuf);
+   glRasterPos2i(350, 470);
+   printstring(GLUT_BITMAP_HELVETICA_10,
+	       "Terrain V1.2 Written by David Bucciarelli ([email protected])");
+   glRasterPos2i(434, 457);
+   printstring(GLUT_BITMAP_HELVETICA_10,
+	       "Based on a Mickael's demo ([email protected])");
+
+   if (help)
+      printhelp();
+
+   reshape(scrwidth, scrheight);
+
+   glutSwapBuffers();
+
+   count++;
+}
+
+static void
+key(unsigned char k, int x, int y)
+{
+   switch (k) {
+   case 27:
+      exit(0);
+      break;
+   case 'a':
+      v += 0.5;
+      break;
+   case 'z':
+      v -= 0.5;
+      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;
+   case 'j':
+      joyactive = (!joyactive);
+      break;
+   case 'h':
+      help = (!help);
+      break;
+   case 'f':
+      fog = (!fog);
+      break;
+   case 't':
+      usetex = (!usetex);
+      break;
+   case 'b':
+      if (bfcull) {
+	 glDisable(GL_CULL_FACE);
+	 bfcull = 0;
+      }
+      else {
+	 glEnable(GL_CULL_FACE);
+	 bfcull = 1;
+      }
+      break;
+#ifdef XMESA
+   case ' ':
+      XMesaSetFXmode(fullscreen ? XMESA_FX_FULLSCREEN : XMESA_FX_WINDOW);
+      fullscreen = (!fullscreen);
+      break;
+#endif
+   }
+}
+
+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
+calccolor(GLfloat height, GLfloat c[3])
+{
+   GLfloat color[4][3] = {
+      {1.0, 1.0, 1.0},
+      {0.0, 0.8, 0.0},
+      {1.0, 1.0, 0.3},
+      {0.0, 0.0, 0.8}
+   };
+   GLfloat fact;
+
+   height = height * (1.0 / 255.0);
+
+   if (height >= 0.9) {
+      c[0] = color[0][0];
+      c[1] = color[0][1];
+      c[2] = color[0][2];
+      return;
+   }
+
+   if ((height < 0.9) && (height >= 0.7)) {
+      fact = (height - 0.7) * 5.0;
+      c[0] = fact * color[0][0] + (1.0 - fact) * color[1][0];
+      c[1] = fact * color[0][1] + (1.0 - fact) * color[1][1];
+      c[2] = fact * color[0][2] + (1.0 - fact) * color[1][2];
+      return;
+   }
+
+   if ((height < 0.7) && (height >= 0.6)) {
+      fact = (height - 0.6) * 10.0;
+      c[0] = fact * color[1][0] + (1.0 - fact) * color[2][0];
+      c[1] = fact * color[1][1] + (1.0 - fact) * color[2][1];
+      c[2] = fact * color[1][2] + (1.0 - fact) * color[2][2];
+      return;
+   }
+
+   if ((height < 0.6) && (height >= 0.5)) {
+      fact = (height - 0.5) * 10.0;
+      c[0] = fact * color[2][0] + (1.0 - fact) * color[3][0];
+      c[1] = fact * color[2][1] + (1.0 - fact) * color[3][1];
+      c[2] = fact * color[2][2] + (1.0 - fact) * color[3][2];
+      return;
+   }
+
+   c[0] = color[3][0];
+   c[1] = color[3][1];
+   c[2] = color[3][2];
+}
+
+static void
+loadpic(void)
+{
+   GLubyte bufferter[256 * 256], terrainpic[256 * 256];
+   FILE *FilePic;
+   int i, tmp;
+   GLenum gluerr;
+
+   if ((FilePic = fopen("terrain.dat", "r")) == NULL) {
+      fprintf(stderr, "Error loading Mnt.bin\n");
+      exit(-1);
+   }
+   fread(bufferter, 256 * 256, 1, FilePic);
+   fclose(FilePic);
+
+   for (i = 0; i < (256 * 256); i++) {
+      terrain[i] = (bufferter[i] * (heightMnt / 255.0f));
+      calccolor((GLfloat) bufferter[i], terraincolor[i]);
+      tmp = (((int) bufferter[i]) + 96);
+      terrainpic[i] = (tmp > 255) ? 255 : tmp;
+   }
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   if ((gluerr = gluBuild2DMipmaps(GL_TEXTURE_2D, 1, 256, 256, GL_LUMINANCE,
+				   GL_UNSIGNED_BYTE,
+				   (GLvoid *) (&terrainpic[0])))) {
+      fprintf(stderr, "GLULib%s\n", gluErrorString(gluerr));
+      exit(-1);
+   }
+
+   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_MIPMAP_LINEAR);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+   glEnable(GL_TEXTURE_2D);
+}
+
+static void
+init(void)
+{
+   float fogcolor[4] = { 0.6, 0.7, 0.7, 1.0 };
+
+   glClearColor(fogcolor[0], fogcolor[1], fogcolor[2], fogcolor[3]);
+   glClearDepth(1.0);
+   glDepthFunc(GL_LEQUAL);
+   glShadeModel(GL_SMOOTH);
+   glEnable(GL_DEPTH_TEST);
+   glEnable(GL_CULL_FACE);
+
+   glDisable(GL_BLEND);
+   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, 0.0007);
+#ifdef FX
+   glHint(GL_FOG_HINT, GL_NICEST);
+#endif
+
+   reshape(scrwidth, scrheight);
+}
+
+
+int
+main(int ac, char **av)
+{
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(WIDTH, HEIGHT);
+   glutInit(&ac, av);
+
+   glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
+
+   if (!(win = glutCreateWindow("Terrain"))) {
+      fprintf(stderr, "Error, couldn't open window\n");
+      return -1;
+   }
+
+   ModZMnt = 0.0f;
+   loadpic();
+
+   init();
+
+#ifndef FX
+   glDisable(GL_TEXTURE_2D);
+   usetex = 0;
+#endif
+
+   glutReshapeFunc(reshape);
+   glutDisplayFunc(drawscene);
+   glutKeyboardFunc(key);
+   glutSpecialFunc(special);
+   glutIdleFunc(drawscene);
+
+   glutMainLoop();
+
+   return 0;
+}