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-rw-r--r--progs/demos/teapot.c575
1 files changed, 575 insertions, 0 deletions
diff --git a/progs/demos/teapot.c b/progs/demos/teapot.c
new file mode 100644
index 00000000000..addee03a3da
--- /dev/null
+++ b/progs/demos/teapot.c
@@ -0,0 +1,575 @@
+/*
+ * 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>
+#include <time.h>
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+#include <GL/glut.h>
+#include "../util/readtex.c"
+#include "shadow.c"
+
+#ifdef XMESA
+#include "GL/xmesa.h"
+static int fullscreen=1;
+#endif
+
+static int WIDTH=640;
+static int HEIGHT=480;
+
+#define FRAME 50
+
+#define BASESIZE 10.0
+
+#define BASERES 12
+#define TEAPOTRES 3
+
+#ifndef M_PI
+#define M_PI 3.1415926535
+#endif
+
+extern void shadowmatrix(GLfloat [4][4], GLfloat [4], GLfloat [4]);
+extern void findplane(GLfloat [4], GLfloat [3], GLfloat [3], GLfloat [3]);
+
+
+static int win=0;
+
+static float obs[3]={5.0,0.0,1.0};
+static float dir[3];
+static float v=0.0;
+static float alpha=-90.0;
+static float beta=90.0;
+
+static GLfloat baseshadow[4][4];
+static GLfloat lightpos[4]={2.3,0.0,3.0,1.0};
+static GLfloat lightdir[3]={-2.3,0.0,-3.0};
+static GLfloat lightalpha=0.0;
+
+static int fog=1;
+static int bfcull=1;
+static int usetex=1;
+static int help=1;
+static int joyavailable=0;
+static int joyactive=0;
+
+static GLuint t1id,t2id;
+static GLuint teapotdlist,basedlist,lightdlist;
+
+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)
+{
+ 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 'a':
+ v+=0.005;
+ break;
+ case 'z':
+ v-=0.005;
+ 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 reshape(int w, int h)
+{
+ WIDTH=w;
+ HEIGHT=h;
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluPerspective(45.0,w/(float)h,0.2,40.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glViewport(0,0,w,h);
+}
+
+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(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,"b - Togle Back face culling");
+ glRasterPos2i(60,270);
+ printstring(GLUT_BITMAP_TIMES_ROMAN_24,"Arrow Keys - Rotate");
+ glRasterPos2i(60,240);
+ printstring(GLUT_BITMAP_TIMES_ROMAN_24,"a - Increase velocity");
+ glRasterPos2i(60,210);
+ printstring(GLUT_BITMAP_TIMES_ROMAN_24,"z - Decrease velocity");
+
+ glRasterPos2i(60,180);
+ 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)");
+}
+
+static void drawbase(void)
+{
+ int i,j;
+ float x,y,dx,dy;
+
+ glBindTexture(GL_TEXTURE_2D,t1id);
+
+ dx=BASESIZE/BASERES;
+ dy=-BASESIZE/BASERES;
+ for(y=BASESIZE/2.0,j=0;j<BASERES;y+=dy,j++) {
+ glBegin(GL_QUAD_STRIP);
+ glColor3f(1.0,1.0,1.0);
+ glNormal3f(0.0,0.0,1.0);
+ for(x=-BASESIZE/2.0,i=0;i<BASERES;x+=dx,i++) {
+ glTexCoord2f(x,y);
+ glVertex3f(x,y,0.0);
+
+ glTexCoord2f(x,y+dy);
+ glVertex3f(x,y+dy,0.0);
+ }
+ glEnd();
+ }
+}
+
+static void drawteapot(void)
+{
+ static float xrot=0.0;
+ static float zrot=0.0;
+
+ glPushMatrix();
+ glRotatef(lightalpha,0.0,0.0,1.0);
+ glMultMatrixf((GLfloat *)baseshadow);
+ glRotatef(-lightalpha,0.0,0.0,1.0);
+
+ glTranslatef(0.0,0.0,1.0);
+ glRotatef(xrot,1.0,0.0,0.0);
+ glRotatef(zrot,0.0,0.0,1.0);
+
+ glDisable(GL_TEXTURE_2D);
+ glDisable(GL_DEPTH_TEST);
+ glDisable(GL_LIGHTING);
+
+ glColor3f(0.0,0.0,0.0);
+ glCallList(teapotdlist);
+
+ glEnable(GL_DEPTH_TEST);
+ glEnable(GL_LIGHTING);
+ if(usetex)
+ glEnable(GL_TEXTURE_2D);
+
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef(0.0,0.0,1.0);
+ glRotatef(xrot,1.0,0.0,0.0);
+ glRotatef(zrot,0.0,0.0,1.0);
+
+ glCallList(teapotdlist);
+ glPopMatrix();
+
+ xrot+=2.0;
+ zrot+=1.0;
+}
+
+static void drawlight1(void)
+{
+ glPushMatrix();
+ glRotatef(lightalpha,0.0,0.0,1.0);
+ glLightfv(GL_LIGHT0,GL_POSITION,lightpos);
+ glLightfv(GL_LIGHT0,GL_SPOT_DIRECTION,lightdir);
+
+ glPopMatrix();
+}
+
+static void drawlight2(void)
+{
+ glPushMatrix();
+ glRotatef(lightalpha,0.0,0.0,1.0);
+ glTranslatef(lightpos[0],lightpos[1],lightpos[2]);
+
+ glDisable(GL_TEXTURE_2D);
+ glCallList(lightdlist);
+ if(usetex)
+ glEnable(GL_TEXTURE_2D);
+
+ glPopMatrix();
+
+ lightalpha+=1.0;
+}
+
+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 draw(void)
+{
+ static int count=0;
+ static char frbuf[80];
+ float fr;
+
+ dojoy();
+
+ glEnable(GL_DEPTH_TEST);
+ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+
+ if(usetex)
+ glEnable(GL_TEXTURE_2D);
+ else
+ glDisable(GL_TEXTURE_2D);
+
+ if(fog)
+ glEnable(GL_FOG);
+ else
+ glDisable(GL_FOG);
+
+ glEnable(GL_LIGHTING);
+
+ glShadeModel(GL_SMOOTH);
+
+ 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);
+
+ drawlight1();
+ glCallList(basedlist);
+ drawteapot();
+ drawlight2();
+ glPopMatrix();
+
+ if((count % FRAME)==0) {
+ fr=gettime();
+ sprintf(frbuf,"Frame rate: %f",FRAME/fr);
+ }
+
+ glDisable(GL_LIGHTING);
+ 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,"Teapot V1.2 Written by David Bucciarelli ([email protected])");
+
+ if(help)
+ printhelp();
+
+ reshape(WIDTH,HEIGHT);
+
+ glutSwapBuffers();
+
+ count++;
+}
+
+static void inittextures(void)
+{
+ GLenum gluerr;
+
+ glGenTextures(1,&t1id);
+ glBindTexture(GL_TEXTURE_2D,t1id);
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT,4);
+ if (!LoadRGBMipmaps("../images/tile.rgb", GL_RGB)) {
+ fprintf(stderr,"Error reading a texture.\n");
+ 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);
+
+ glGenTextures(1,&t2id);
+ glBindTexture(GL_TEXTURE_2D,t2id);
+
+ if (!LoadRGBMipmaps("../images/bw.rgb", GL_RGB)) {
+ fprintf(stderr,"Error reading a texture.\n");
+ 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);
+}
+
+static void initlight(void)
+{
+ float lamb[4]={0.2,0.2,0.2,1.0};
+ float lspec[4]={1.0,1.0,1.0,1.0};
+
+ glLightf(GL_LIGHT0,GL_SPOT_CUTOFF,70.0);
+ glLightf(GL_LIGHT0,GL_SPOT_EXPONENT,20.0);
+ glLightfv(GL_LIGHT0,GL_AMBIENT,lamb);
+ glLightfv(GL_LIGHT0,GL_SPECULAR,lspec);
+
+ glMaterialf(GL_FRONT_AND_BACK,GL_SHININESS,20.0);
+ glMaterialfv(GL_FRONT_AND_BACK,GL_SPECULAR,lspec);
+
+ glEnable(GL_LIGHT0);
+}
+
+static void initdlists(void)
+{
+ GLUquadricObj *lcone,*lbase;
+ GLfloat plane[4];
+ GLfloat v0[3]={0.0,0.0,0.0};
+ GLfloat v1[3]={1.0,0.0,0.0};
+ GLfloat v2[3]={0.0,1.0,0.0};
+
+ findplane(plane,v0,v1,v2);
+ shadowmatrix(baseshadow,plane,lightpos);
+
+ teapotdlist=glGenLists(1);
+ glNewList(teapotdlist,GL_COMPILE);
+ glRotatef(90.0,1.0,0.0,0.0);
+ glCullFace(GL_FRONT);
+ glBindTexture(GL_TEXTURE_2D,t2id);
+ glutSolidTeapot(0.75);
+ glCullFace(GL_BACK);
+ glEndList();
+
+ basedlist=glGenLists(1);
+ glNewList(basedlist,GL_COMPILE);
+ drawbase();
+ glEndList();
+
+ lightdlist=glGenLists(1);
+ glNewList(lightdlist,GL_COMPILE);
+ glDisable(GL_LIGHTING);
+
+ lcone=gluNewQuadric();
+ lbase=gluNewQuadric();
+ glRotatef(45.0,0.0,1.0,0.0);
+
+ glColor3f(1.0,1.0,1.0);
+ glCullFace(GL_FRONT);
+ gluDisk(lbase,0.0,0.2,12.0,1.0);
+ glCullFace(GL_BACK);
+
+ glColor3f(0.5,0.0,0.0);
+ gluCylinder(lcone,0.2,0.0,0.5,12,1);
+
+ gluDeleteQuadric(lcone);
+ gluDeleteQuadric(lbase);
+
+ glEnable(GL_LIGHTING);
+ glEndList();
+}
+
+int main(int ac, char **av)
+{
+ float fogcolor[4]={0.025,0.025,0.025,1.0};
+
+ fprintf(stderr,"Teapot V1.2\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("Teapot"))) {
+ fprintf(stderr,"Error, couldn't open window\n");
+ return -1;
+ }
+
+ reshape(WIDTH,HEIGHT);
+
+ glShadeModel(GL_SMOOTH);
+ glEnable(GL_DEPTH_TEST);
+ glEnable(GL_CULL_FACE);
+ glEnable(GL_TEXTURE_2D);
+
+ glEnable(GL_FOG);
+ glFogi(GL_FOG_MODE,GL_EXP2);
+ glFogfv(GL_FOG_COLOR,fogcolor);
+
+ glFogf(GL_FOG_DENSITY,0.04);
+ glHint(GL_FOG_HINT,GL_NICEST);
+ glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+
+ calcposobs();
+
+ inittextures();
+ initlight();
+
+ 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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