ray.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:19k
- /*
- * 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>
- #if defined(GL_VERSION_1_1)
- /* Routines called directly. */
- #elif defined(GL_EXT_texture_object) && defined(GL_EXT_copy_texture) && defined(GL_EXT_subtexture)
- #define glBindTexture(A,B) glBindTextureEXT(A,B)
- #define glGenTextures(A,B) glGenTexturesEXT(A,B)
- #define glTexSubImage2D(A,B,C,D,E,F,G,H,I) glTexSubImage2DEXT(A,B,C,D,E,F,G,H,I)
- #else
- #define glBindTexture(A,B)
- #define glGenTextures(A,B)
- #define glTexSubImage2D(A,B,C,D,E,F,G,H,I)
- #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)
- /* Some <math.h> files do not define M_PI... */
- #ifndef M_PI
- #define M_PI 3.14159265358979323846
- #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 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];
- }
- /* ARGSUSED1 */
- 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;
- }
- }
- /* ARGSUSED1 */
- 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;
- }
- }
- 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 (tech.hmw@plus.it)");
- 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);
- for(y=0;y<TEX_CHECK_NUMSLOT;y++)
- updatecheckmap(y);
- 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);
- glGenTextures(1,&reflectid);
- glBindTexture(GL_TEXTURE_2D,reflectid);
- for(y=0;y<TEX_REFLECT_NUMSLOT;y++)
- updatereflectmap(y);
- 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);
- }
- 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 V1.0nWritten 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);
- glutCreateWindow("Ray");
- 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; /* ANSI C requires main to return int. */
- }