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#include "header.h"
#define WINDOW_TITLE "Mandelbrot"
#define WINDOW_X 20
#define WINDOW_Y 20
static void update(GState *state);
static void event_handler(GState *state);
static void destroy_state(GState *state);
static void error_exit_state(GState *state, const char *msg);
static void error_exit(const char *msg);
GState *graphics_init(GConf *conf)
{
GState *state = (GState*)malloc(sizeof(GState));
if (state == NULL)
return NULL;
if (SDL_Init(SDL_INIT_VIDEO) < 0)
error_exit("unable to init SDL");
state->window = SDL_CreateWindow(WINDOW_TITLE, WINDOW_X, WINDOW_Y,
WINDOW_W, WINDOW_H, 0);
if (state->window == NULL)
error_exit("unable to create window");
state->renderer = SDL_CreateRenderer(state->window, -1, 0);
if (state->renderer == NULL)
error_exit_state(state, "unable to create renderer");
state->running = true;
return state;
}
void graphics_quit(GState *state)
{
destroy_state(state);
SDL_Quit();
}
void graphics_run(GState *state)
{
while (state->running)
{
event_handler(state);
update(state);
SDL_Delay(3);
}
}
static void update(GState *state)
{
SDL_SetRenderDrawColor(state->renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
SDL_RenderClear(state->renderer);
for (int x = 0; x < WINDOW_W; x++)
{
for (int y = 0; y < WINDOW_H; y++)
{
double complex mapped_z = map_range((double)x, 0, WINDOW_W, LO, HI)
+ map_range((double)y, 0, WINDOW_H, LO, HI) * I;
int steps = mandelbrot_in_set(mapped_z);
if (steps == -1)
continue;
double brightness = map_range(steps, LO, HI, 0, 20);
SDL_SetRenderDrawColor(state->renderer, brightness, brightness,
brightness, SDL_ALPHA_OPAQUE);
SDL_RenderDrawPoint(state->renderer, x, y);
}
}
SDL_RenderPresent(state->renderer);
}
static void event_handler(GState *state)
{
SDL_Event e;
while (SDL_PollEvent(&e))
{
switch (e.type)
{
case SDL_QUIT:
state->running = false;
break;
}
}
}
static void destroy_state(GState *state)
{
if (state == NULL)
return;
SDL_DestroyRenderer(state->renderer);
SDL_DestroyWindow(state->window);
free(state);
}
static void error_exit_state(GState *state, const char *msg)
{
destroy_state(state);
error_exit(msg);
}
static void error_exit(const char *msg)
{
SDL_Log("ERROR: %s: %s", SDL_GetError(), msg);
SDL_Quit();
exit(EXIT_FAILURE);
}
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