77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <time.h>
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#include <unistd.h>
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#include "consts.h"
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#include "pngwriter.h"
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unsigned long get_time() {
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struct timeval tp;
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gettimeofday(&tp, NULL);
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return tp.tv_sec * 1000000 + tp.tv_usec;
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}
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int main(int argc, char **argv) {
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png_data *pPng = png_create(IMAGE_WIDTH, IMAGE_HEIGHT);
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double x, y, x2, y2, cx, cy;
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cy = MIN_Y;
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double fDeltaX = (MAX_X - MIN_X) / (double)IMAGE_WIDTH;
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double fDeltaY = (MAX_Y - MIN_Y) / (double)IMAGE_HEIGHT;
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long nTotalIterationsCount = 0;
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unsigned long nTimeStart = get_time();
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long i, j, n;
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n = 0;
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// do the calculation
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for (j = 0; j < IMAGE_HEIGHT; j++) {
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cx = MIN_X;
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for (i = 0; i < IMAGE_WIDTH; i++) {
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x = cx;
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y = cy;
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x2 = x * x;
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y2 = y * y;
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// compute the orbit z, f(z), f^2(z), f^3(z), ...
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// count the iterations until the orbit leaves the circle |z|=2.
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// stop if the number of iterations exceeds the bound MAX_ITERS.
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// TODO
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// >>>>>>>> CODE IS MISSING
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// <<<<<<<< CODE IS MISSING
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// n indicates if the point belongs to the mandelbrot set
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// plot the number of iterations at point (i, j)
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int c = ((long)n * 255) / MAX_ITERS;
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png_plot(pPng, i, j, c, c, c);
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cx += fDeltaX;
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}
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cy += fDeltaY;
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}
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unsigned long nTimeEnd = get_time();
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// print benchmark data
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printf("Total time: %g millisconds\n",
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(nTimeEnd - nTimeStart) / 1000.0);
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printf("Image size: %ld x %ld = %ld Pixels\n",
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(long)IMAGE_WIDTH, (long)IMAGE_HEIGHT,
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(long)(IMAGE_WIDTH * IMAGE_HEIGHT));
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printf("Total number of iterations: %ld\n", nTotalIterationsCount);
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printf("Avg. time per pixel: %g microseconds\n",
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(nTimeEnd - nTimeStart) / (double)(IMAGE_WIDTH * IMAGE_HEIGHT));
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printf("Avg. time per iteration: %g microseconds\n",
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(nTimeEnd - nTimeStart) / (double)nTotalIterationsCount);
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printf("Iterations/second: %g\n",
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nTotalIterationsCount / (double)(nTimeEnd - nTimeStart) * 1e6);
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// assume there are 8 floating point operations per iteration
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printf("MFlop/s: %g\n",
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nTotalIterationsCount * 8.0 / (double)(nTimeEnd - nTimeStart));
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png_write(pPng, "mandel.png");
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return 0;
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}
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