restructure

master
Tanjita
parent 2d836e1022
commit 9f204ddb1b

@ -2,31 +2,35 @@
#include <complex.h>
#include <stdbool.h>
int main(int argc, char *argv[]) {
SDL_Surface *screen = NULL;
if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
printf("Error: Could not initialize SDL: %s.\n", SDL_GetError());
exit(1);
}
screen = SDL_SetVideoMode(1280, 800, 32, SDL_SWSURFACE);
/* Compute the out-coloring based on the iteration counter. */
Uint32 outcolor(int it) {
return 0x00010001 * it;
}
if (SDL_MUSTLOCK(screen)) {
SDL_LockSurface(screen);
/* Compute the in-coloring. */
Uint32 incolor() {
return 0x00000000; /* black */
}
void drawmandelbrot(SDL_Surface *surface) {
if (SDL_MUSTLOCK(surface)) {
SDL_LockSurface(surface);
}
Uint32 *pixels = (Uint32 *) screen->pixels;
for (int i = 0; i < screen->w * screen->h; i++) {
int y = i / screen->w;
int x = i % screen->w;
Uint32 *pixels = (Uint32 *) surface->pixels;
for (int i = 0; i < surface->w * surface->h; i++) {
int y = i / surface->w;
int x = i % surface->w;
float complex c = ((3.0 * x / screen->w) - 2.0)
+ I * ((2.0 * y / screen->h) - 1.0);
float complex c = ((3.0 * x / surface->w) - 2.0)
+ I * ((2.0 * y / surface->h) - 1.0);
bool diverges = false;
float complex z = 0;
int it;
for (it = 1; it < 256; it++) {
z = cpowf(z, 2) + c;
if (cabs(z) > 100) {
if (cabs(z) > 2) {
diverges = true;
break;
}
@ -34,28 +38,43 @@ int main(int argc, char *argv[]) {
Uint32 color;
if (diverges) {
color = 0x00010001 * it;
color = outcolor(it);
} else {
color = 0x00000000;
color = incolor();
}
pixels[i] = color;
if (y % 10 == 0)
SDL_Flip(screen);
/* Update the screen every 10 lines. */
if (y % 10 == 0) {
SDL_Flip(surface);
}
}
if (SDL_MUSTLOCK(surface)) {
SDL_UnlockSurface(surface);
}
SDL_Flip(surface);
}
int main(int argc, char *argv[]) {
/* Set up SDL. */
if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
fprintf(stderr, "Error: Could not initialize SDL: %s.\n", SDL_GetError());
exit(1);
}
SDL_Surface *screen = SDL_SetVideoMode(320, 240, 32, SDL_SWSURFACE);
/* Do the mandelbrot. */
drawmandelbrot(screen);
/* Save BMP */
char *file = "mandelbrot.bmp";
if (SDL_SaveBMP(screen, file) != 0) {
fprintf(stderr, "Could not write %s!\n", file);
}
if (SDL_MUSTLOCK(screen)) {
SDL_UnlockSurface(screen);
}
SDL_Flip(screen);
/* Quit. */
SDL_Delay(20000);
SDL_Quit();
}

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