+++ /dev/null
-/*
- * 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 <math.h>
-#include <time.h>
-#include <string.h>
-
-#ifdef WIN32
-#include <windows.h>
-#endif
-
-#include <GL/glut.h>
-#include "readtex.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 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;
-
-
-
-/******************** begin shadow code ********************/
-
-/* Taken from the projshadow.c - by Tom McReynolds, SGI */
-
-/* Modified by David Bucciarelli */
-
-enum {
- X, Y, Z, W
-};
-enum {
- A, B, C, D
-};
-
-/* create a matrix that will project the desired shadow */
-void
-shadowmatrix(GLfloat shadowMat[4][4],
- GLfloat groundplane[4],
- GLfloat lightpos[4])
-{
- GLfloat dot;
-
- /* find dot product between light position vector and ground plane normal */
- dot = groundplane[X] * lightpos[X] +
- groundplane[Y] * lightpos[Y] +
- groundplane[Z] * lightpos[Z] +
- groundplane[W] * lightpos[W];
-
- shadowMat[0][0] = dot - lightpos[X] * groundplane[X];
- shadowMat[1][0] = 0.f - lightpos[X] * groundplane[Y];
- shadowMat[2][0] = 0.f - lightpos[X] * groundplane[Z];
- shadowMat[3][0] = 0.f - lightpos[X] * groundplane[W];
-
- shadowMat[X][1] = 0.f - lightpos[Y] * groundplane[X];
- shadowMat[1][1] = dot - lightpos[Y] * groundplane[Y];
- shadowMat[2][1] = 0.f - lightpos[Y] * groundplane[Z];
- shadowMat[3][1] = 0.f - lightpos[Y] * groundplane[W];
-
- shadowMat[X][2] = 0.f - lightpos[Z] * groundplane[X];
- shadowMat[1][2] = 0.f - lightpos[Z] * groundplane[Y];
- shadowMat[2][2] = dot - lightpos[Z] * groundplane[Z];
- shadowMat[3][2] = 0.f - lightpos[Z] * groundplane[W];
-
- shadowMat[X][3] = 0.f - lightpos[W] * groundplane[X];
- shadowMat[1][3] = 0.f - lightpos[W] * groundplane[Y];
- shadowMat[2][3] = 0.f - lightpos[W] * groundplane[Z];
- shadowMat[3][3] = dot - lightpos[W] * groundplane[W];
-
-}
-
-/* find the plane equation given 3 points */
-void
-findplane(GLfloat plane[4],
- GLfloat v0[3], GLfloat v1[3], GLfloat v2[3])
-{
- GLfloat vec0[3], vec1[3];
-
- /* need 2 vectors to find cross product */
- vec0[X] = v1[X] - v0[X];
- vec0[Y] = v1[Y] - v0[Y];
- vec0[Z] = v1[Z] - v0[Z];
-
- vec1[X] = v2[X] - v0[X];
- vec1[Y] = v2[Y] - v0[Y];
- vec1[Z] = v2[Z] - v0[Z];
-
- /* find cross product to get A, B, and C of plane equation */
- plane[A] = vec0[Y] * vec1[Z] - vec0[Z] * vec1[Y];
- plane[B] = -(vec0[X] * vec1[Z] - vec0[Z] * vec1[X]);
- plane[C] = vec0[X] * vec1[Y] - vec0[Y] * vec1[X];
-
- plane[D] = -(plane[A] * v0[X] + plane[B] * v0[Y] + plane[C] * v0[Z]);
-}
-
-/******************** end shadow code ********************/
-
-
-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 cleanup(void)
-{
- glDeleteTextures(1, &t1id);
- glDeleteTextures(1, &t2id);
- glDeleteLists(teapotdlist, 1);
- glDeleteLists(basedlist, 1);
- glDeleteLists(lightdlist, 1);
-}
-
-static void key(unsigned char k, int x, int y)
-{
- switch(k) {
- case 27:
- cleanup();
- 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 - Toggle Help");
- glRasterPos2i(60,360);
- printstring(GLUT_BITMAP_TIMES_ROMAN_24,"t - Toggle Textures");
- glRasterPos2i(60,330);
- printstring(GLUT_BITMAP_TIMES_ROMAN_24,"f - Toggle Fog");
- glRasterPos2i(60,300);
- printstring(GLUT_BITMAP_TIMES_ROMAN_24,"b - Toggle 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 - Toggle jostick control (Joystick control available)");
- else
- printstring(GLUT_BITMAP_TIMES_ROMAN_24,"(No Joystick control available)");
-}
-
-static void drawbase(void)
-{
- static const GLfloat amb[4] = { 1, .5, 0.2, 1 };
- static const GLfloat diff[4] = { 1, .4, 0.2, 1 };
- int i,j;
- float x,y,dx,dy;
-
- glBindTexture(GL_TEXTURE_2D,t1id);
-
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, amb);
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diff);
- 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 const GLfloat amb[4] = { 0.2, 0.2, 0.2, 1 };
- static const GLfloat diff[4] = { 0.8, 0.3, 0.5, 1 };
- static float xrot=0.0;
- static float zrot=0.0;
-
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, amb);
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diff);
-
- 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 char frbuf[80] = "";
-
- 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();
-
- 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 (tech.hmw@plus.it)");
-
- if(help)
- printhelp();
-
- reshape(WIDTH,HEIGHT);
-
- 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)
-{
- 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);
-
- glPixelTransferf(GL_RED_SCALE, 0.75);
- glPixelTransferf(GL_RED_BIAS, 0.25);
- glPixelTransferf(GL_GREEN_SCALE, 0.75);
- glPixelTransferf(GL_GREEN_BIAS, 0.25);
- glPixelTransferf(GL_BLUE_SCALE, 0.75);
- glPixelTransferf(GL_BLUE_BIAS, 0.25);
-
- if (!LoadRGBMipmaps("../images/bw.rgb", GL_RGB)) {
- fprintf(stderr,"Error reading a texture.\n");
- exit(-1);
- }
-
- glPixelTransferf(GL_RED_SCALE, 1.0);
- glPixelTransferf(GL_RED_BIAS, 0.0);
- glPixelTransferf(GL_GREEN_SCALE, 1.0);
- glPixelTransferf(GL_GREEN_BIAS, 0.0);
- glPixelTransferf(GL_BLUE_SCALE, 1.0);
- glPixelTransferf(GL_BLUE_BIAS, 0.0);
-
-
- 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 matamb[4] ={0.5, 0.5, 0.5, 1.0};
- float matdiff[4]={0.9, 0.2, 0.2, 1.0};
- float matspec[4]={1.0,1.0,1.0,1.0};
-
- float lamb[4] ={1.5, 1.5, 1.5, 1.0};
- float ldiff[4]={1.0, 1.0, 1.0, 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_DIFFUSE,ldiff);
- glLightfv(GL_LIGHT0,GL_SPECULAR,lspec);
-
- glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 15.0);
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, matdiff);
- glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, matspec);
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, matamb);
-
- glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lamb);
- 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 (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;
- }
- */
-
- 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();
- cleanup();
-
- return 0;
-}
projects / mesa.git / blobdiff