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xenocara/dist/Mesa/progs/demos/ray.c
matthieu 8c9bfd57b8 Import MesaDemos 6.5.1
2006-11-25 18:56:37 +00:00

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/*
* 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)) )
#ifndef fabs
#define fabs(x) ((x)<0.0f?-(x):(x))
#endif
#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;
}
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