88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
/*
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flame - cosmic recursive fractal flames
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Copyright (C) 1992 Scott Draves <spot@cs.cmu.edu>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef libifs_included
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#define libifs_included
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include "cmap.h"
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#define EPS (1e-10)
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#define variation_random (-1)
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#define NVARS 29
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#define NXFORMS 6
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typedef double point[3];
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typedef struct {
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double var[NVARS]; /* normalized interp coefs between variations */
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double c[3][2]; /* the coefs to the affine part of the function */
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double density; /* prob is this function is chosen. 0 - 1 */
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double color; /* color coord for this function. 0 - 1 */
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} xform;
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typedef struct {
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xform xform[NXFORMS];
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clrmap cmap;
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double time;
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int cmap_index;
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double brightness; /* 1.0 = normal */
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double contrast; /* 1.0 = normal */
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double gamma;
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int width, height; /* of the final image */
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int spatial_oversample;
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double center[2]; /* camera center */
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double zoom; /* effects ppu and sample density */
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double pixels_per_unit; /* and scale */
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double spatial_filter_radius; /* variance of gaussian */
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double sample_density; /* samples per pixel (not bucket) */
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/* in order to motion blur more accurately we compute the logs of the
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sample density many times and average the results. we interpolate
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only this many times. */
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int nbatches;
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/* this much color resolution. but making it too high induces clipping */
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int white_level;
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int cmap_inter; /* if this is true, then color map interpolates one entry
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at a time with a bright edge */
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double pulse[2][2]; /* [i][0]=magnitude [i][1]=frequency */
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double wiggle[2][2]; /* frequency is /minute, assuming 30 frames/s */
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} control_point;
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extern void iterate(control_point *cp, int n, int fuse, point points[]);
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extern void interpolate(control_point cps[], int ncps, double time, control_point *result);
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extern void tokenize(char **ss, char *argv[], int *argc);
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extern void print_control_point(FILE *f, control_point *cp, int quote);
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extern void random_control_point(control_point *cp, int ivar);
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extern void parse_control_point(char **ss, control_point *cp);
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extern void estimate_bounding_box(control_point *cp, double eps, double *bmin, double *bmax);
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extern double standard_metric(control_point *cp1, control_point *cp2);
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extern double random_uniform01(void);
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extern double random_uniform11(void);
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extern double random_gaussian(void);
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extern void mult_matrix(double s1[2][2], double s2[2][2], double d[2][2]);
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void copy_variation(control_point *cp0, control_point *cp1);
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#endif
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