Changing Window Size Mid-Game (Like in an options menu) Trouble

Changing Window Size Mid-Game (Like in an options menu) Trouble

KnightWhoSaysNi

Member #7,339

June 2006

I am programming a tile map editor. It has two modes; Edit mode to edit the tile map and test mode to display it like it would be in a game. I want to have Edit mode windowed at 1300*800 and test mode full screen at 640*480 but I am having problems doing this. Here some code that demonstrates my problem that uses the classes and similar code in my editor.

1#include <allegro.h>
2#include <iostream>
3 
4#define WINDOWED    0
5#define FULLSCREEN  1
6 
7#define MODE_ONE    1
8#define MODE_TWO    2
9 
10class Window
11{
12    public:
13        Window();
14        Window(int m, int w, int h, int d);
15        ~Window();
16 
17        int ApplySettings();
18        int SetParameters(int m, int w, int h, int d);
19        void Deinitialize();
20 
21        int SetTitle(std::string t);
22 
23        void Flip();
24        void Clear();
25 
26        void ShowMouse();
27        void HideMouse();
28 
29        BITMAP* buffer;
30 
31    private:
32        int window;
33        int width, height;
34        int depth;
35        std::string title;
36 
37        int activePage;
38        BITMAP* page[2];
39};
40 
41Window::Window()
42{
43    window = GFX_AUTODETECT_WINDOWED;
44 
45    width = 640;
46    height = 480;
47    depth = 16;
48 
49    title = "Allegro Window";
50 
51    page[0] = NULL;
52    page[1] = NULL;
53    activePage = 1;
54 
55    allegro_init();
56 
57    install_keyboard();
58    install_mouse();
59 
60}
61 
62Window::Window(int m, int w, int h, int d)
63{
64    if (m == FULLSCREEN)
65        window = GFX_AUTODETECT_FULLSCREEN;
66    else
67        window = GFX_AUTODETECT_WINDOWED;
68 
69    width = w;
70    height = h;
71    depth = d;
72 
73    title = "Allegro Window";
74 
75    page[0] = NULL;
76    page[1] = NULL;
77    activePage = 1;
78 
79    allegro_init();
80 
81    install_keyboard();
82    install_mouse();
83 
84}
85 
86Window::~Window() {}
87 
88int Window::ApplySettings()
89{
90    set_color_depth(depth);
91 
92    if (set_gfx_mode(window, width, height, 0, 0) < 0)
93        return 0;
94 
95    if (page[0] != NULL)
96        destroy_bitmap(page[0]);
97    if (page[1] != NULL)
98        destroy_bitmap(page[1]);
99 
100    page[0] = NULL;
101    page[1] = NULL;
102 
103    page[0] = create_video_bitmap(width, height);
104    page[1] = create_video_bitmap(width, height);
105 
106    buffer = page[activePage];
107 
108    return 1;
109}
110 
111int Window::SetParameters(int m, int w, int h, int d)
112{
113    if (m == FULLSCREEN)
114        window = GFX_AUTODETECT_FULLSCREEN;
115    else
116        window = GFX_AUTODETECT_WINDOWED;
117 
118    width = w;
119    height = h;
120    depth = d;
121}
122 
123int Window::SetTitle(std::string t)
124{
125    title = t;
126    set_window_title(title.c_str());
127    return 0;
128}
129 
130void Window::Deinitialize()
131{
132    destroy_bitmap(page[0]);
133    destroy_bitmap(page[1]);
134}
135 
136void Window::Flip()
137{
138    show_video_bitmap(buffer);
139 
140    activePage = 1 - activePage;
141 
142    buffer = page[activePage];
143}
144 
145void Window::Clear()
146{
147    clear(buffer);
148}
149 
150void Window::ShowMouse()
151{
152    show_os_cursor(MOUSE_CURSOR_ARROW);
153}
154 
155void Window::HideMouse()
156{
157    show_os_cursor(0);
158}
159 
160int main()
161{
162 
163    Window Screen(WINDOWED, 640, 480, 16);
164    Screen.ApplySettings();
165    Screen.ShowMouse();
166 
167    int quit = false;
168    int mode = MODE_ONE;
169 
170    int x = 200;
171 
172    while (!quit)
173    {
174        Screen.Clear();
175 
176        if (key[KEY_ESC])
177            quit = true;
178 
179        if (key[KEY_LEFT])
180            x--;
181        else if (key[KEY_RIGHT])
182            x++;
183 
184        if (mode == MODE_ONE)
185        {
186            if (key[KEY_F2])
187            {
188                mode = MODE_TWO;
189                Screen.SetParameters(WINDOWED, 800, 600, 16);
190                Screen.ApplySettings();
191            }
192 
193            textprintf_ex(Screen.buffer, font, x, 200, makecol(255,255,255), -1, "MODE 1");
194        }
195 
196        else if (mode == MODE_TWO)
197        {
198            if (key[KEY_F1])
199            {
200                mode = MODE_ONE;
201                Screen.SetParameters(WINDOWED, 640, 480, 16);
202                Screen.ApplySettings();
203            }
204            textprintf_ex(Screen.buffer, font, x, 100, makecol(255,255,255), -1, "MODE 2");
205        }
206 
207        Screen.Flip();
208    }
209 
210    Screen.Deinitialize();
211 
212    return 0;
213 
214}END_OF_MAIN()

Upon switching to MODE_TWO the first time by pressing F2 all is fine. Then I switch back to MODE_ONE by pressing F1 and it is fine again. When I switch back to MODE_TWO, it doesn't display the text. MODE_ONE still works fine though.

All I can think of, since I am using page flipping, is that the clear buffer command becomes out of sync.

How do you suggest I change this code or is there an alternative way of doing this?

Thank you for your time.