bubble.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:10k
- #include <math.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <GL/glut.h>
- #include "texture.h"
- /* Some <math.h> files do not define M_PI... */
- #ifndef M_PI
- #define M_PI 3.14159265358979323846
- #endif
- #ifndef __sgi
- /* Most math.h's do not define float versions of the trig functions. */
- #define sinf(x) ((float)sin((x)))
- #define cosf(x) ((float)cos((x)))
- #endif
- static float transp = .5f;
- static int normals;
- static float phase = .05;
- static int tess = 10;
- static float freq = 10.f, scale = .03;
- static float transx = 1.0, transy, rotx, roty;
- static int ox = -1, oy = -1;
- static int mot = 0;
- #define PAN 1
- #define ROT 2
- void
- pan(const int x, const int y) {
- transx += (x-ox)/5.;
- transy -= (y-oy)/5.;
- ox = x; oy = y;
- glutPostRedisplay();
- }
- void
- rotate(const int x, const int y) {
- rotx += x-ox;
- if (rotx > 360.) rotx -= 360.;
- else if (rotx < -360.) rotx += 360.;
- roty += y-oy;
- if (roty > 360.) roty -= 360.;
- else if (roty < -360.) roty += 360.;
- ox = x; oy = y;
- glutPostRedisplay();
- }
- void
- motion(int x, int y) {
- if (mot == PAN) pan(x, y);
- else if (mot == ROT) rotate(x,y);
- }
- void
- mouse(int button, int state, int x, int y) {
- if(state == GLUT_DOWN) {
- switch(button) {
- case GLUT_LEFT_BUTTON:
- mot = PAN;
- motion(ox = x, oy = y);
- break;
- case GLUT_MIDDLE_BUTTON:
- mot = ROT;
- motion(ox = x, oy = y);
- break;
- case GLUT_RIGHT_BUTTON:
- break;
- }
- } else if (state == GLUT_UP) {
- mot = 0;
- }
- }
- void init(char *fname) {
- int width, height, components;
- GLubyte *image;
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glEnable(GL_DEPTH_TEST);
- glShadeModel(GL_SMOOTH);
- if (!(image = (GLubyte *)read_texture(fname, &width, &height, &components))) {
- perror(fname);
- exit(EXIT_FAILURE);
- }
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, image);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
- glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
- glEnable(GL_TEXTURE_GEN_S);
- glEnable(GL_TEXTURE_GEN_T);
- glEnable(GL_TEXTURE_2D);
- glEnable(GL_CULL_FACE);
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glEnable(GL_NORMALIZE);
- glFrontFace(GL_CW);
- glCullFace(GL_BACK);
- glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
- glEnable(GL_COLOR_MATERIAL);
- #if 1
- glMaterialf (GL_FRONT, GL_SHININESS, 64.0);
- glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, 1);
- {
- GLfloat pos[4] = { 0, 0, 1, 1};
- glLightfv(GL_LIGHT0, GL_POSITION, pos);
- }
- #endif
- { int e; if (e = glGetError()) printf("error %xn", e); }
- #if 0
- glClearColor(.2,.2f,.58f,1.f);
- #endif
- glBlendFunc(GL_SRC_ALPHA, GL_ONE);
- glEnable(GL_BLEND);
- }
- #if 0
- cube(void) {
- glBegin(GL_QUAD_STRIP);
- glVertex3f(-1.,-1.,-1.);
- glVertex3f(-1., 1.,-1.);
- glVertex3f( 1.,-1.,-1.);
- glVertex3f( 1., 1.,-1.);
- glVertex3f(-1.,-1.,-1.);
- glVertex3f(-1.,-1.,-1.);
- glVertex3f(-1.,-1.,-1.);
- glEnd();
- }
- #endif
- /*
- * bilinear (longitude/lattitude) tesselation
- * x = cos(theta)*cos(phi)
- * y = sin(phi)
- * z = sin(theta)*cos(phi)
- */
- float *normalize(float *v) {
- static float vv[3];
- float len;
- len = v[0]*v[0] + v[1]*v[1] + v[2]*v[2];
- vv[0] = v[0]/len; vv[1] = v[1]/len; vv[2] = v[2]/len;
- return vv;
- }
- void
- bubble(float rad) {
- float v[3],s;
- float phi, mod;
- static float off;
- int i, j;
- #define N tess
- off += phase;
- #if 0
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- #endif
- #if 1
- /* top cap */
- glBegin(GL_TRIANGLE_FAN);
- glNormal3f(0.f, 1.f, 0.f);
- glVertex3f(0.f, 1.f, 0.f);
- v[1] = rad*sinf(phi = M_PI*(N+2)/(2*N));
- mod = 1+scale*sinf(freq*v[1]+off);
- s = cosf(phi)*rad*mod;
- for(i = 0; i <= 2*N; i++) {
- v[0] = s*cosf((M_PI/N)*i);
- v[2] = s*sinf((M_PI/N)*i);
- glNormal3fv(v);
- glVertex3fv(v);
- }
- glEnd();
- #endif
- #if 1
- for(i = 1; i < N-1; i++) {
- float v0[3], v1[3], s0, s1;
- v0[1] = rad*sinf(phi=M_PI/2+M_PI/N*i); s0 = rad*cosf(phi);
- mod = mod = 1+scale*sin(freq*v0[1]+off); s0 *= mod;
- v1[1] = rad*sinf(phi=M_PI/2+M_PI/N*(i+1)); s1 = rad*cosf(phi);
- mod = mod = 1+scale*sin(freq*v1[1]+off); s1 *= mod;
- glBegin(GL_TRIANGLE_STRIP);
- for(j = 0; j <= 2*N; j++) {
- float x, z;
- v0[0] = s0*(x = sinf(M_PI/N*j));
- v0[2] = s0*(z = cosf(M_PI/N*j));
- v1[0] = s1*x; v1[2] = s1*z;
- glNormal3fv(normalize(v1));
- glVertex3fv(v1);
- glNormal3fv(normalize(v0));
- glVertex3fv(v0);
- }
- glEnd();
- #if 1
- if (normals) {
- float nscale = 1.2;
- /*glDisable(GL_LIGHTING);*/
- glBegin(GL_LINES);
- /*glColor3f(1.f, 1.f, 0.f);*/
- for(j = 0; j <= 2*N; j++) {
- GLfloat x[3], x1, z1, *vv;
- v0[0] = s0*(x1 = sinf(M_PI/N*j));
- v0[2] = s0*(z1 = cosf(M_PI/N*j));
- glVertex3fv(vv = normalize(v0));
- x[0] = nscale*vv[0]; x[1] = nscale*vv[1]; x[2] = nscale*vv[2];
- glVertex3fv(x);
- v1[0] = s1*x1; v1[2] = s1*z1;
- glVertex3fv(vv = normalize(v1));
- x[0] = nscale*vv[0]; x[1] = nscale*vv[1]; x[2] = nscale*vv[2];
- glVertex3fv(x);
- }
- glEnd();
- /*glEnable(GL_LIGHTING);*/
- }
- #endif
- }
- #endif
- #if 1
- /* bottom cap */
- glBegin(GL_TRIANGLE_FAN);
- glNormal3f(0.f, -1.f, 0.f);
- glVertex3f(0.f, -1.f, 0.f);
- v[1] = -rad*sinf(phi=M_PI*(N+2)/(2*N));
- mod = 1+scale*sin(freq*v[1]+off);
- s = cosf(phi)*rad*mod;
- for(i = 2*N; i >= 0; --i) {
- v[0] = s*cosf((M_PI/N)*i);
- v[2] = s*sinf((M_PI/N)*i);
- glNormal3fv(v);
- glVertex3fv(v);
- }
- glEnd();
- #endif
- }
- void display(void) {
- #if 0
- static float phase;
- #endif
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- #if 0
- glMatrixMode(GL_TEXTURE);
- glPushMatrix();
- s = sinf(phase); t = s; phase += M_PI/25.f;
- if (phase > 2*M_PI) phase -= 2*M_PI;
- glTranslatef(.5f, -0.5f, 0.f);
- glScalef(.1f, .1f, 1.f);
- glTranslatef(s, t, 0.f);
- glMatrixMode(GL_MODELVIEW);
- #endif
- glPushMatrix();
- glTranslatef(0., 0., -100.+transx);
- glRotatef(roty, 1.0, 0.0, 0.0);
- glScalef(10.f, 10.f, 10.f);
- glColor4f(1.f,1.f,1.f,transp);
- bubble(1.0f);
- glPopMatrix ();
- #if 0
- glMatrixMode(GL_TEXTURE);
- glPopMatrix();
- glMatrixMode(GL_MODELVIEW);
- #endif
- glutSwapBuffers();
- }
- void reshape(int w, int h) {
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- #if 0
- if (w <= h)
- glOrtho (-3.5, 3.5, -3.5*(GLfloat)h/(GLfloat)w,
- 3.5*(GLfloat)h/(GLfloat)w, -3.5, 10.5);
- else
- glOrtho (-3.5*(GLfloat)w/(GLfloat)h,
- 3.5*(GLfloat)w/(GLfloat)h, -3.5, 3.5, -3.5, 10.5);
- #endif
- gluPerspective(40., 1.0, 10.0, 200000.);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- }
- void ffunc(void) {
- static int state = 1;
- if (state ^= 1)
- glBlendFunc(GL_SRC_ALPHA, GL_SRC_ALPHA);
- else
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- }
- void tfunc(void) {
- static int state = 1;
- if (state ^= 1)
- glEnable(GL_TEXTURE_2D);
- else
- glDisable(GL_TEXTURE_2D);
- }
- void lfunc(void) {
- static int state = 1;
- if (state ^= 1)
- glEnable(GL_LIGHTING);
- else
- glDisable(GL_LIGHTING);
- glEnable(GL_COLOR_MATERIAL);
- }
- void bfunc(void) {
- static int state = 1;
- if (state ^= 1) {
- glEnable(GL_BLEND);
- glDisable(GL_DEPTH_TEST);
- } else {
- glDisable(GL_BLEND);
- glEnable(GL_DEPTH_TEST);
- }
- }
- void cfunc(void) {
- static int state = 1;
- if (state ^= 1)
- glEnable(GL_CULL_FACE);
- else
- glDisable(GL_CULL_FACE);
- }
- void wfunc(void) {
- static int state;
- glPolygonMode(GL_FRONT_AND_BACK, (state ^= 1) ? GL_LINE : GL_FILL);
- }
- void ufunc(void) {
- tess *= 2;
- if (tess > 160) tess = 160;
- }
- void Ufunc(void) {
- tess /= 2;
- if (tess < 10) tess = 10;
- }
- void pfunc(void) {
- phase += .01;
- }
- void Pfunc(void) {
- phase -= .01;
- }
- void nfunc(void) {
- normals ^= 1;
- }
- void xfunc(void) {
- transp += .1;
- }
- void Xfunc(void) {
- transp -= .1;
- }
- void yfunc(void) {
- static int state;
- if (state ^= 1)
- /*glClearColor(.2,.2f,.58f,0.f);*/
- glClearColor(.0,.0f,.65,0.f);
- else
- glClearColor(0.f, 0.f, 0.f, 0.f);
- }
- void up(void) {
- scale += .01f;
- }
- void down(void) {
- scale -= .01f;
- }
- void left(void) {
- freq -= 1.f;
- }
- void right(void) {
- freq += 1.f;
- }
- /*ARGSUSED1*/
- void key (unsigned char key, int x, int y) {
- switch (key) {
- case 'b': bfunc(); break;
- case 'c': cfunc(); break;
- case 'l': lfunc(); break;
- case 't': tfunc(); break;
- case 'f': ffunc(); break;
- case 'n': nfunc(); break;
- case 'u': ufunc(); break;
- case 'U': Ufunc(); break;
- case 'p': pfunc(); break;
- case 'P': Pfunc(); break;
- case 'w': wfunc(); break;
- case 'x': xfunc(); break;
- case 'X': Xfunc(); break;
- case 'y': yfunc(); break;
- case ' 33': exit(EXIT_SUCCESS); break;
- default: break;
- }
- }
- /*ARGSUSED1*/
- void
- special(int key, int x, int y) {
- switch(key) {
- case GLUT_KEY_UP: up(); break;
- case GLUT_KEY_DOWN: down(); break;
- case GLUT_KEY_LEFT: left(); break;
- case GLUT_KEY_RIGHT:right(); break;
- }
- }
- void animate(void) {
- glutPostRedisplay();
- }
- int main(int argc, char** argv) {
- glutInitWindowSize(256, 256);
- glutInit(&argc, argv);
- glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
- glutInitWindowPosition(100, 100);
- glutCreateWindow (argv[0]);
- init(argc > 1 ? argv[1] : "../data/spheremap.rgb");
- glutDisplayFunc(display);
- glutReshapeFunc(reshape);
- glutKeyboardFunc(key);
- glutSpecialFunc(special);
- glutIdleFunc(animate);
- glutMouseFunc(mouse);
- glutMotionFunc(motion);
- glutMainLoop();
- return 0;
- }