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-rw-r--r--progs/demos/ray.c902
1 files changed, 902 insertions, 0 deletions
diff --git a/progs/demos/ray.c b/progs/demos/ray.c
new file mode 100644
index 000000000..eb1d19f86
--- /dev/null
+++ b/progs/demos/ray.c
@@ -0,0 +1,902 @@
+/*
+ * This program is under the GNU GPL.
+ * Use at your own risk.
+ *
+ * written by David Bucciarelli (tech.hmw@plus.it)
+ * Humanware s.r.l.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.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;
+
+static GLint T0 = 0;
+static GLint Frames = 0;
+
+#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 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);
+
+ if (dir[0] < 1.0e-5 && dir[0] > -1.0e-5)
+ dir[0] = 0;
+ if (dir[1] < 1.0e-5 && dir[1] > -1.0e-5)
+ dir[1] = 0;
+ if (dir[2] < 1.0e-5 && dir[2] > -1.0e-5)
+ dir[2] = 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 - Toggle Help");
+ glRasterPos2i(60, 370);
+ printstring(GLUT_BITMAP_HELVETICA_12, "f - Toggle Fog");
+ glRasterPos2i(60, 350);
+ printstring(GLUT_BITMAP_HELVETICA_12, "b - Toggle Back face culling");
+ glRasterPos2i(60, 330);
+ printstring(GLUT_BITMAP_HELVETICA_12, "p - Toggle 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 - Toggle 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 - Toggle the plane texture map window");
+
+ glRasterPos2i(60, 170);
+ printstring(GLUT_BITMAP_HELVETICA_12,
+ "2 - Toggle 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 = pow(kfact, 6.0) * 7.0 * 255.0;
+
+ 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 = pow(kfact, 4.0);
+ if (kfact < 1.0e-10)
+ kfact = 0.0;
+ }
+
+ 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 char frbuf[80] = "";
+
+ 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();
+
+ 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 (tech.hmw@plus.it)");
+
+ if (help)
+ printhelp();
+
+ glMatrixMode(GL_PROJECTION);
+ glPopMatrix();
+ glMatrixMode(GL_MODELVIEW);
+
+ updatemaps();
+
+ glutSwapBuffers();
+
+ Frames++;
+ {
+ GLint t = glutGet(GLUT_ELAPSED_TIME);
+ if (t - T0 >= 2000) {
+ GLfloat seconds = (t - T0) / 1000.0;
+ GLfloat fps = Frames / seconds;
+ sprintf(frbuf, "Frame rate: %f", fps);
+ T0 = t;
+ Frames = 0;
+ }
+ }
+}
+
+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 (tech.hmw@plus.it)\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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 02:27:07 +0000