1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
#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;
static const size_t init_render_resolution = 4;
size_t current_resolution = init_render_resolution;
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);
}
string build_title() {
stringstream ss;
ss << "Mandel "
<< setprecision(17)
<< " x=" << par.cx
<< " y=" << par.cy
<< " w=" << par.imgw
<< " i=" << par.maxit
<< " par1=" << par.par1
<< " par2=" << par.par2;
return ss.str();
}
void update_title() {
SDL_SetWindowTitle(window, build_title().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_w: par.par1++; return action::redraw;
case SDLK_s: par.par1 = max(1, par.par1) - 1; return action::redraw;
case SDLK_e: par.par2++; return action::redraw;
case SDLK_d: par.par2 = max(1, par.par2) - 1; return action::redraw;
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:
goto exit_app;
case State::action::redraw:
state.current_resolution = State::init_render_resolution;
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;
}
}
exit_app:
cout << state.build_title() << endl;
}
#endif
|
