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#include <iostream>
#include <iomanip>
#include <sstream>
#include <optional>
#include <SDL.h>
#include "mandel.h"
using namespace std;
#if 1
struct State {
SDL_Window *window = nullptr;
int w = -1, h = -1;
Mandel *ctx = nullptr;
Params par = mandel_default_params();
uint8_t *imgdata = nullptr;
SDL_Surface *mandelsurf = nullptr;
size_t current_resolution = 4;
State() {
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
cerr << "SDL init error: " << SDL_GetError() << endl;
exit(1);
}
window = SDL_CreateWindow("Mandel", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 960, 640, SDL_WINDOW_SHOWN);
if (!window) {
cerr << "SDL window creation error: " << SDL_GetError() << endl;
exit(1);
}
handle_resize();
mandel_render(imgdata, ctx, &par, current_resolution);
blit();
SDL_UpdateWindowSurface(window);
}
void blit() {
SDL_Surface *winsurf = SDL_GetWindowSurface(window);
if (SDL_MUSTLOCK(winsurf)) SDL_LockSurface(winsurf);
SDL_BlitSurface(mandelsurf, nullptr, winsurf, nullptr);
if (SDL_MUSTLOCK(winsurf)) SDL_UnlockSurface(winsurf);
}
void update_title() {
stringstream ss;
ss << "Mandel "
<< setprecision(17)
<< " x=" << par.cx
<< " y=" << par.cy
<< " w=" << par.imgw
<< " i=" << par.maxit;
SDL_SetWindowTitle(window, ss.str().data());
}
SDL_Event wait_event() const {
SDL_Event e;
if (SDL_WaitEvent(&e) == 0) {
cerr << "SDL event wait error: " << SDL_GetError() << endl;
exit(1);
}
return e;
}
optional<SDL_Event> poll_event() const {
SDL_Event e;
if (SDL_PollEvent(&e) == 0) {
return nullopt;
}
return {e};
}
void handle_resize() {
if (ctx) mandel_free(ctx);
if (imgdata) delete[] imgdata;
if (mandelsurf) SDL_FreeSurface(mandelsurf);
SDL_GetWindowSize(window, &w, &h);
cerr << "w=" << w << " h=" << h << endl;
imgdata = new uint8_t[3 * w * h];
mandelsurf = SDL_CreateRGBSurfaceFrom(imgdata, w, h, 24, 3 * w, 255, 255 << 8, 255 << 16, 0);
ctx = mandel_init(w, h);
}
enum class action {
quit,
redraw,
idle,
};
action handle_event(const SDL_Event &e) {
const double min_img_size = min(par.imgw, mandel_imgh(ctx, &par));
const double scroll_dist = min_img_size * 0.1;
switch (e.type) {
case SDL_QUIT:
return action::quit;
case SDL_KEYDOWN:
switch (e.key.keysym.sym) {
case SDLK_UP: par.cy += scroll_dist; return action::redraw;
case SDLK_DOWN: par.cy -= scroll_dist; return action::redraw;
case SDLK_RIGHT: par.cx += scroll_dist; return action::redraw;
case SDLK_LEFT: par.cx -= scroll_dist; return action::redraw;
case SDLK_KP_PLUS: case SDLK_PLUS: case SDLK_EQUALS:
par.imgw *= 0.8; return action::redraw;
case SDLK_KP_MINUS: case SDLK_MINUS:
par.imgw *= 1.25; return action::redraw;
case SDLK_PAGEUP:
par.maxit += 128; return action::redraw;
case SDLK_PAGEDOWN:
if (par.maxit > 256) { par.maxit -= 128; return action::redraw; }
break;
case SDLK_q:
return action::quit;
}
break;
case SDL_WINDOWEVENT:
switch (e.window.event) {
case SDL_WINDOWEVENT_FOCUS_GAINED:
SDL_UpdateWindowSurface(window);
return action::idle;
case SDL_WINDOWEVENT_SIZE_CHANGED:
handle_resize();
return action::redraw;
}
break;
}
return action::idle;
}
};
int main() {
State state;
while (true) {
state.update_title();
State::action action;
if (state.current_resolution == 1) {
SDL_Event ev = state.wait_event();
action = state.handle_event(ev);
} else {
if (optional<SDL_Event> optev = state.poll_event()) {
action = state.handle_event(*optev);
} else {
action = State::action::idle;
}
}
switch (action) {
case State::action::quit:
return 0;
case State::action::redraw:
state.current_resolution = 4;
SDL_GetWindowSize(state.window, &state.w, &state.h);
cerr << "w=" << state.w << " h=" << state.h << endl;
// cerr << "mandelsurf: w=" << state.mandelsurf->w << " h=" << state.mandelsurf->h << endl;
mandel_render(state.imgdata, state.ctx, &state.par, state.current_resolution);
state.blit();
SDL_UpdateWindowSurface(state.window);
break;
case State::action::idle:
if (state.current_resolution > 1) {
state.current_resolution /= 2;
mandel_render(state.imgdata, state.ctx, &state.par, state.current_resolution);
}
state.blit();
SDL_UpdateWindowSurface(state.window);
break;
}
}
}
#endif
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