commit f670f850c62a1280d6a40aee6c182a93052d7250
Author: mjkloeckner <martin.cachari@gmail.com>
Date: Fri, 23 Dec 2022 00:12:17 -0300
first insertion
Diffstat:
| A | Makefile | | | 21 | +++++++++++++++++++++ |
| A | main.c | | | 91 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | mandelbrot | | | 0 | |
| A | sdl_extra.c | | | 36 | ++++++++++++++++++++++++++++++++++++ |
| A | sdl_extra.h | | | 15 | +++++++++++++++ |
| A | status.h | | | 41 | +++++++++++++++++++++++++++++++++++++++++ |
6 files changed, 204 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -0,0 +1,21 @@
+CC := gcc
+CLIBS := `sdl2-config --libs` -lSDL2_ttf -lm
+CFLAGS := `sdl2-config --cflags` -Wall -Wshadow -pedantic -ansi -std=c99 -O3
+SRCS := $(wildcard *.c)
+OBJS := $(SRCS:.c=.o)
+
+TARGET := mandelbrot
+
+.PHONY: all clean
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+ $(CC) $(CLIBS) $(CFLAGS) -o $@ $^
+ rm -f $(OBJS)
+
+%.o: %.c
+ $(CC) $(CLIBS) $(CFLAGS) -c $< -o $@
+
+clean:
+ rm -f $(OBJS)
diff --git a/main.c b/main.c
@@ -0,0 +1,91 @@
+#include "sdl_extra.h"
+#include <stdbool.h>
+#include <complex.h>
+
+#define BG_COLOR 0x191919FF
+#define MAX_IT 100
+
+#define UNHEX(color) \
+ ((color) >> (8 * 3)) & 0xFF, \
+ ((color) >> (8 * 2)) & 0xFF, \
+ ((color) >> (8 * 1)) & 0xFF, \
+ ((color) >> (8 * 0)) & 0xFF
+
+float map(float x, float in_min, float in_max, float out_min, float out_max);
+void render_mandelbrot(int win_w, int win_h, SDL_Renderer *rend);
+
+float map(float x, float in_min, float in_max, float out_min, float out_max) {
+ return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}
+
+void render_mandelbrot(int win_w, int win_h, SDL_Renderer *rend) {
+ size_t i, j, it;
+ float complex z0, z;
+ float real, imag, fg;
+ for(i = 0; i < win_w; i++) {
+ for(j = 0; j < win_w; j++) {
+ /* z0 = map(i, 0, win_w, -2.00, 0.47) + map(j, 0, win_h, -1.12, 1.12) * I; */
+ z0 = map(i, 0, win_w, -2.00, 1.00) + map(j, 0, win_h, -1.50, 1.50) * I;
+ z = 0.0 + 0.0 * I;
+ for(it = 0; (it <= MAX_IT) && (creal(z)*creal(z) + cimag(z)*cimag(z) <= 2*2); it++) {
+ real = creal(z)*creal(z) - cimag(z)*cimag(z) + creal(z0);
+ imag = 2*creal(z)*cimag(z) + cimag(z0);
+ z = real + imag * I;
+ }
+
+ fg = map(it, 0, MAX_IT, 0, 1);
+ uint8_t b = map(sqrt(fg), 0, 1, 0, 255);
+
+ if(it == MAX_IT) b = 0;
+
+ uint32_t color = (b << 24) + (b << 16) + (b << 8) + 0xFF;
+ SDL_SetRenderDrawColor(rend, UNHEX(color));
+ SDL_RenderDrawPoint(rend, i, j);
+ }
+ }
+}
+
+int main (int argc, char *argv[]) {
+ SDL_Window *win;
+ SDL_Renderer *rend;
+ SDL_Event event;
+ status_t st;
+ bool run = true;
+ int win_w, win_h;
+
+ if((st = SDL_setup(&win, &rend)) != OK) {
+ fprintf(stderr, "%s: couldn't initialize SDL2", argv[0]);
+ return st;
+ }
+
+ win_w = 800;
+ win_h = 600;
+ while(run) {
+ while(SDL_PollEvent(&event)) {
+ switch(event.type) {
+ case SDL_QUIT:
+ run = false;
+ break;
+ case SDL_WINDOWEVENT:
+ switch(event.window.event) {
+ case SDL_WINDOWEVENT_RESIZED:
+ win_w = event.window.data1;
+ win_h = event.window.data2;
+ break;
+ default: break;
+ }
+ default: break;
+ }
+ }
+
+ SDL_SetRenderDrawColor(rend, UNHEX(BG_COLOR));
+ SDL_RenderClear(rend);
+
+ render_mandelbrot(win_w, win_h, rend);
+
+ SDL_RenderPresent(rend);
+ }
+
+ SDL_cleanup(win, rend);
+ return 0;
+}
diff --git a/mandelbrot b/mandelbrot
Binary files differ.
diff --git a/sdl_extra.c b/sdl_extra.c
@@ -0,0 +1,36 @@
+#include "sdl_extra.h"
+
+status_t SDL_setup(SDL_Window **win, SDL_Renderer **rend) {
+ if (SDL_Init(SDL_INIT_VIDEO) != 0)
+ return ERROR_SDL_INIT;
+
+ *win = SDL_CreateWindow(
+ WIN_TITLE,
+ SDL_WINDOWPOS_CENTERED,
+ SDL_WINDOWPOS_CENTERED,
+ 800,
+ 600,
+ SDL_WINDOW_RESIZABLE
+ );
+
+ *rend = SDL_CreateRenderer(*win, -1, SDL_RENDERER_ACCELERATED);
+
+ if ((*win == NULL) || (*rend == NULL))
+ return ERROR_NULL_POINTER;
+
+ if(TTF_Init() == -1)
+ return ERROR_SDL_FONT_INIT;
+
+ return OK;
+}
+
+status_t SDL_cleanup(SDL_Window *win, SDL_Renderer *rend) {
+ if((win == NULL) || (rend == NULL))
+ return ERROR_NULL_POINTER;
+
+ TTF_Quit();
+ SDL_DestroyRenderer(rend);
+ SDL_DestroyWindow(win);
+ SDL_Quit();
+ return OK;
+}
diff --git a/sdl_extra.h b/sdl_extra.h
@@ -0,0 +1,15 @@
+#ifndef __SDL_EXTRA_H__
+#define __SDL_EXTRA_H__
+
+#include "status.h"
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_ttf.h>
+
+#define WIN_TITLE "mandelbrot visualizer"
+
+status_t SDL_setup(SDL_Window **win, SDL_Renderer **rend);
+status_t SDL_cleanup(SDL_Window *win, SDL_Renderer *rend);
+
+#endif
+
diff --git a/status.h b/status.h
@@ -0,0 +1,41 @@
+#ifndef __STATUS_H__
+#define __STATUS_H__
+
+typedef enum {
+ OK = 0,
+ RUN,
+ PAUSE,
+ SORTED,
+ STOP,
+ UPDATE,
+ ERROR_MEMORY_ALLOC,
+ ERROR_TTF_OPENING_FONT,
+ ERROR_SDL_FONT_INIT,
+ ERROR_SDL_INIT,
+ ERROR_NULL_POINTER,
+ ERROR_DRW,
+ START,
+ RESTART,
+ WELCOME,
+ STATUS_MAX
+} status_t;
+
+static char* const status_string[STATUS_MAX] = {
+ "OK",
+ "RUN",
+ "PAUSE",
+ "SORTED",
+ "STOP",
+ "UPDATE",
+ "ERROR_MEMORY_ALLOC",
+ "ERROR_TTF_OPENING_FONT",
+ "ERROR_SDL_FONT_INIT",
+ "ERROR_SDL_INIT",
+ "ERROR_NULL_POINTER",
+ "ERROR_DRW",
+ "START",
+ "RESTART",
+ "WELCOME"
+};
+
+#endif
