315 lines
8.3 KiB
C++
315 lines
8.3 KiB
C++
#define XLOCK 1
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#ifdef XLOCK
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#include "xlock.h"
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#endif
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#include "i_spline.h"
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#include "i_evert.h"
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extern "C" {
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#include <math.h>
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}
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extern int bezier;
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extern char *parts;
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extern int n_strips;
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void print_point (FILE *fp, TwoJetVec p, double ps, double pus, double pvs, double puvs, int binary)
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{
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if(bezier) {
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float xyz[3];
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xyz[0] = double(p.x)*ps + p.x.df_du()*pus/3. + p.x.df_dv()*pvs/3.
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+ p.x.d2f_dudv()*puvs/9.;
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xyz[1] = double(p.y)*ps + p.y.df_du()*pus/3. + p.y.df_dv()*pvs/3.
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+ p.y.d2f_dudv()*puvs/9.;
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xyz[2] = double(p.z)*ps + p.z.df_du()*pus/3. + p.z.df_dv()*pvs/3.
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+ p.z.d2f_dudv()*puvs/9.;
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if (binary) {
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(void) fwrite(&xyz, sizeof(float), 3, fp);
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} else {
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(void) fprintf(fp, "%g %g %g\n", xyz[0], xyz[1], xyz[2]);
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}
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}
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else{
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double x= double(p.x)*ps ;
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double y= double(p.y)*ps ;
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double z= double(p.z)*ps ;
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double nx= p.y.df_du()*p.z.df_dv()-p.z.df_du()*p.y.df_dv();
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double ny= p.z.df_du()*p.x.df_dv()-p.x.df_du()*p.z.df_dv();
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double nz= p.x.df_du()*p.y.df_dv()-p.y.df_du()*p.x.df_dv();
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double s = nx*nx + ny*ny + nz*nz;
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if(s > 0) s = sqrt(1/s);
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(void) fprintf(fp, "%f %f %f %f %f %f\n", x, y, z, nx*s, ny*s, nz*s);
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}
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}
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void printMesh(
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#ifndef XLOCK
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FILE *fp,
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#endif
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TwoJetVec p)
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{
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double x= double(p.x) ;
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double y= double(p.y) ;
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double z= double(p.z) ;
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double nx= p.y.df_du()*p.z.df_dv()-p.z.df_du()*p.y.df_dv();
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double ny= p.z.df_du()*p.x.df_dv()-p.x.df_du()*p.z.df_dv();
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double nz= p.x.df_du()*p.y.df_dv()-p.y.df_du()*p.x.df_dv();
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double s = nx*nx + ny*ny + nz*nz;
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if(s > 0) s = sqrt(1/s);
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#ifdef XLOCK
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glNormal3d(nx*s, ny*s, nz*s);
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glVertex3d(x, y, z);
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#else
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(void) fprintf(fp, "%f %f %f %f %f %f\n", x, y, z, nx*s, ny*s, nz*s);
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#endif
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}
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void printSpline(FILE *fp, TwoJetVec v00, TwoJetVec v01,
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TwoJetVec v10, TwoJetVec v11,
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double us, double vs,
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double s0, double s1, double t0, double t1, int binary) {
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if (bezier) {
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print_point(fp, v00, 1, 0, 0, 0, binary);
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print_point(fp, v00, 1, us, 0, 0, binary);
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print_point(fp, v10, 1,-us, 0, 0, binary);
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print_point(fp, v10, 1, 0, 0, 0, binary);
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print_point(fp, v00, 1, 0, vs, 0, binary);
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print_point(fp, v00, 1, us, vs, us*vs, binary);
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print_point(fp, v10, 1,-us, vs,-us*vs, binary);
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print_point(fp, v10, 1, 0, vs, 0, binary);
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print_point(fp, v01, 1, 0,-vs, 0, binary);
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print_point(fp, v01, 1, us,-vs,-us*vs, binary);
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print_point(fp, v11, 1,-us,-vs, us*vs, binary);
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print_point(fp, v11, 1, 0,-vs, 0, binary);
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print_point(fp, v01, 1, 0, 0, 0, binary);
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print_point(fp, v01, 1, us, 0, 0, binary);
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print_point(fp, v11, 1,-us, 0, 0, binary);
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print_point(fp, v11, 1, 0, 0, 0, binary);
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if (binary) {
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float sts[8] = {(float) s0, (float) t0,
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(float) s1, (float) t0,
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(float) s0, (float) t1,
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(float) s1, (float) t1};
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(void) fwrite(&sts, sizeof(float), 8, fp);
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} else {
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(void) fprintf(fp, "%g %g %g %g %g %g %g %g\n\n",
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s0,t0, s1,t0, s0,t1, s1,t1);
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}
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}
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else {
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print_point(fp, v00, 1, us, vs, us*vs, binary);
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print_point(fp, v10, 1, us, vs, us*vs, binary);
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print_point(fp, v11, 1, us, vs, us*vs, binary);
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print_point(fp, v01, 1, us, vs, us*vs, binary);
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if(!binary)
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fputc('\n', fp);
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}
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}
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#define sqr(A) ((A)*(A))
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static inline double calcSpeedV(TwoJetVec v) {
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return sqrt(sqr(v.x.df_dv()) + sqr(v.y.df_dv()) + sqr(v.z.df_dv()));
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}
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static inline double calcSpeedU(TwoJetVec v) {
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return sqrt(sqr(v.x.df_du()) + sqr(v.y.df_du()) + sqr(v.z.df_du()));
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}
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#define PART_POS 0x1
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#define PART_NEG 0x2
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char *parse_parts(char *parts)
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{
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/* Construct matrices to replicate standard unit (u=0..1, v=0..1) into
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* complete sphere.
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*/
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char *partlist = (char *)calloc(n_strips, sizeof(char));
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char *cp, *ncp, sign;
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int bits, j;
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for(cp = parts; *cp; ) {
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while((sign = *cp++) == ' ' || sign == ',')
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;
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if(sign == '+')
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bits = PART_POS;
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else if(sign == '-')
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bits = PART_NEG;
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else {
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bits = PART_POS|PART_NEG;
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cp--;
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}
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if(*cp == '*') {
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for(j = 0; j < n_strips; j++)
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partlist[j] |= bits;
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cp++;
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} else {
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j = strtol(cp, &ncp, 0);
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if(cp == ncp) {
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(void) fprintf(stderr,
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"evert -parts: expected string with alternating signs and strip numbers\n");
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return (char *) NULL;
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}
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if(j < 0 || j >= n_strips) {
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(void) fprintf(stderr,
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"evert -parts: bad strip number %d; must be in range 0..%d\n", j, n_strips-1);
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return (char *) NULL;
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}
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partlist[j] |= bits;
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cp = ncp;
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}
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}
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return partlist;
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}
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void printScene(
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SurfaceTimeFunction *func,
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double umin, double umax, double adu,
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double vmin, double vmax, double adv,
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double t, int binary
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)
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{
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static TwoJetVec **values;
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int j, k;
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int jmax = (int) (fabs(umax-umin)/adu+.5);
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int kmax = (int) (fabs(vmax-vmin)/adv+.5);
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double u, v, du, dv;
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FILE *fp = stdout;
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if(jmax == 0) jmax = 1;
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du = (umax-umin) / jmax;
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if(kmax == 0) kmax = 1;
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dv = (vmax-vmin) / kmax;
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values = (TwoJetVec **) calloc(jmax+1, sizeof(TwoJetVec *));
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double *speedv = (double *) calloc(jmax+1, sizeof(double));
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double **speedu = (double **) calloc(jmax+1, sizeof(double *));
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for (j = 0; j <= jmax; j++) {
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u = umin + j*du;
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values[j] = (TwoJetVec *) calloc(kmax+1, sizeof(TwoJetVec));
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speedu[j] = (double *) calloc(kmax+1, sizeof(double));
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speedv[j] = calcSpeedV((*func)(ThreeJet(u, 1, 0), ThreeJet(0, 0, 1), t));
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if(speedv[j] == 0) {
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/* Perturb a bit, hoping to avoid degeneracy */
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u += (u<1) ? 1e-9 : -1e-9;
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speedv[j] = calcSpeedV((*func)(ThreeJet(u, 1, 0), ThreeJet(0, 0, 1), t));
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}
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for (k = 0; k <= kmax; k++) {
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v = vmin + k*dv;
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values[j][k] = (*func)(
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ThreeJet(u, 1, 0),
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ThreeJet(v, 0, 1),
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t
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);
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speedu[j][k] = calcSpeedU(values[j][k]);
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}
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}
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#if 0
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(void) fprintf(fp, "Declare \"speeds\" \"varying float\"\n");
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(void) fprintf(fp, "Declare \"speedt\" \"varying float\"\n");
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#endif
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#ifndef XLOCK
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if(parts != NULL) {
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/* Construct matrices to replicate standard unit (u=0..1, v=0..1) into
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* complete sphere.
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*/
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char *partlist = parse_parts(parts);
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if(partlist == NULL)
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return;
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(void) fprintf(fp, "{ INST transforms { TLIST\n");
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for(j = -1; j <= 1; j += 2) {
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for(k = 0; k < n_strips; k++) {
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if(partlist[k] & (j<0 ? PART_NEG : PART_POS)) {
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double t = 2*M_PI * (j < 0 ? n_strips-1-k : k) / n_strips;
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double s = sin(t), c = cos(t);
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(void) fprintf(fp, "# %c%d of %d\n", j<0 ? '-' : '+', k, n_strips);
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(void) fprintf(fp, "\t%10f %10f %10f %10f\n", j*c, -s, 0., 0.);
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(void) fprintf(fp, "\t%10f %10f %10f %10f\n", j*s, c, 0., 0.);
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(void) fprintf(fp, "\t%10f %10f %10f %10f\n", 0., 0., (double)j, 0.);
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(void) fprintf(fp, "\t%10f %10f %10f %10f\n", 0., 0., 0., 1.);
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}
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}
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}
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(void) fprintf(fp, "}\ngeom ");
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}
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#endif
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if(bezier) {
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(void) fprintf(fp, "{ STBBP%s\n", binary ? " BINARY" : "");
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for (j = 0; j < jmax; j++) {
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u = umin + j*du;
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for (k = 0; k < kmax; k++) {
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v = vmin + k*dv;
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printSpline(fp, values[j][k], values[j][k+1],
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values[j+1][k], values[j+1][k+1],
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du, dv,
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umin+j*du, umin+(j+1)*du, vmin+k*dv, vmin+(k+1)*dv, binary);
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}
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}
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}
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else {
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#ifndef XLOCK
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int nu = kmax+1, nv = jmax+1;
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(void) fprintf(fp, "{ NMESH%s\n", binary ? " BINARY" : "");
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if(binary) {
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(void) fwrite(&nu, sizeof(int), 1, stdout);
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(void) fwrite(&nv, sizeof(int), 1, stdout);
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} else {
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(void) fprintf(fp, "%d %d\n", nu, nv);
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}
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#endif
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#ifdef XLOCK
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for(j = 1; j <= jmax; j++) {
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glBegin(GL_QUAD_STRIP);
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for(k = 0; k <= kmax; k++) {
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printMesh(values[j-1][k]);
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printMesh(values[j][k]);
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}
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glEnd();
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#else
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for(j = 0; j <= jmax; j++) {
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for(k = 0; k <= kmax; k++)
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printMesh(fp, values[j][k]);
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if(!binary)
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fputc('\n', fp);
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#endif
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}
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}
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#ifndef XLOCK
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if(parts)
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(void) fprintf(fp, " }\n");
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(void) fprintf(fp, "}\n");
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#endif
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for (j = 0; j <= jmax; j++) {
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if (values[j] != NULL) {
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free(values[j]);
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values[j] = (TwoJetVec *) NULL;
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}
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if (speedu[j] != NULL) {
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free(speedu[j]);
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speedu[j] = (double *) NULL;
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}
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}
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free(values);
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free(speedu);
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free(speedv);
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}
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#if 0
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void impossible(char *msg) {
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(void) fprintf(stderr, "%s\n", msg);
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}
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#endif
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