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55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
#include "SDL.h"
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#include <complex.h>
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#include <stdbool.h>
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int main(int argc, char *argv[]) {
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SDL_Surface *screen = NULL;
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if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
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printf("Error: Could not initialize SDL: %s.\n", SDL_GetError());
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exit(1);
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}
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screen = SDL_SetVideoMode(640, 480, 32, SDL_SWSURFACE);
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if (SDL_MUSTLOCK(screen)) {
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SDL_LockSurface(screen);
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}
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Uint32 *pixels = (Uint32 *) screen->pixels;
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for (int i = 0; i < screen->w * screen->h; i++) {
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int y = i / screen->w;
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int x = i % screen->w;
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if (x == 0) {
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printf("y = %d\n", y);
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}
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float complex c = (3.0 * x / 640.0) - 2.0
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+ I * ((2.0 * y / 480.0) - 1.0);
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bool diverges = false;
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float complex z = 0;
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int it;
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for (it=1; it<256; it++) {
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z = cpowf(z, 2) + c;
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if (cabs(z) > 100) {
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diverges = true;
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break;
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}
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}
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Uint32 color = 0x00000000;
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if (diverges) {
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color = 0x01010101 * it;
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}
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pixels[i] = color;
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}
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if (SDL_MUSTLOCK(screen)) {
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SDL_UnlockSurface(screen);
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}
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SDL_Flip(screen); /* XXX */
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SDL_Delay(20000);
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SDL_Quit();
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}
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