AllegroGL not making window

AllegroGL not making window

biscuitz

Member #5,679

March 2005

1#include <allegro.h>
2#include <alleggl.h>
3 
4 
5void Init()
6{
7    allegro_init();
8    install_allegro_gl();
9    install_keyboard();
10 
11    set_gfx_mode(GFX_OPENGL_WINDOWED, 640, 480, 0, 0);
12 
13    glClearColor(0.0, 0.0, 0.0, 0.0);
14}
15 
16int main()
17{
18    Init();
19    glClear(GL_COLOR_BUFFER_BIT);
20    readkey();
21 
22    return 0;
23}
24END_OF_MAIN();

The code is supposed to make a blank window but the window doesn't show up.

P.S. I installed the latest dev-paks for Allegro and AllegroGL.

---Allegro Version 4.2.0 (beta4)
The hardest part is getting started.
WATCH TV! It's good for ya'
Wave your hand really fast in front of the monitor (It looks like when those Matrix agents dodge bullets)

BrknPhoenix

Member #7,304

June 2006

Heh I bet I know what tutorial you're getting that from. You need to call the allegro_gl_flip() function (no parameters) to flip the buffer onto the screen.

biscuitz

Member #5,679

March 2005

I added flip after the "glClear" in main() now it comes up with an error

Quote:

AppName: allegro gl.exe AppVer: 0.0.0.0 ModName: allegro gl.exe
ModVer: 0.0.0.0 Offset: 00002fc5

edit: I tried compiling another example:

1#include <allegro.h>
2#include <alleggl.h>
3 
4volatile int Time = 0;
5void TimerFunc()
6{
7    Time++;
8}
9END_OF_FUNCTION(TimerFunc);
10 
11void Init()
12{
13    allegro_init();
14    install_allegro_gl();
15    install_keyboard();
16    install_timer();
17 
18    set_gfx_mode(GFX_OPENGL_WINDOWED, 640, 480, 0, 0);
19 
20    glClearColor(0.0, 0.0, 0.0, 0.0);
21}
22 
23int main()
24{
25    Init();
26 
27    float x = 0.0, y = 0.5;
28 
29    LOCK_VARIABLE(Time);
30    LOCK_FUNCTION(TimerFunc);
31 
32    install_int_ex(TimerFunc, BPS_TO_TIMER(60));
33 
34    while(!key[KEY_ESC])
35    {
36        while(Time > 0)
37        {
38            poll_keyboard();
39            if(key[KEY_UP])     y += 0.01;
40            if(key[KEY_DOWN])   y -= 0.01;
41            if(key[KEY_RIGHT])  x += 0.01;
42            if(key[KEY_LEFT])   x -= 0.01;
43 
44            glClear(GL_COLOR_BUFFER_BIT);
45            glBegin(GL_LINES);
46                glColor3f(1.0, 0.0, 0.0);
47                glVertex2f(0.0, 0.0);
48                glVertex2f(x, y);
49                glColor3f(0.0, 1.0, 0.0);
50                glVertex2f(0.0, 0.0);
51                glVertex2f(-x, y);
52                glColor3f(0.0, 0.0, 1.0);
53                glVertex2f(0.0, 0.0);
54                glVertex2f(x, -y);
55                glColor3f(0.0, 1.0, 1.0);
56                glVertex2f(0.0, 0.0);
57                glVertex2f(-x, -y);
58            glEnd();
59            glFlush();
60 
61            Time--;
62        }
63    }
64 
65    return 0;
66}
67END_OF_MAIN();

And the window still won't show up. I think it has something to do with the dev-paks I installed >.< Ima try to compile the libraries from scratch.

BrknPhoenix

Member #7,304

June 2006

Oh well, I wasn't sure if just the flip would work. This should:

1#include <allegro.h>
2#include <alleggl.h>
3 
4 
5void Init()
6{
7    allegro_init();
8    install_allegro_gl();
9    install_keyboard();
10 
11    allegro_gl_clear_settings();
12    allegro_gl_set(AGL_COLOR_DEPTH, 16);
13    allegro_gl_set(AGL_Z_DEPTH, 8);
14    allegro_gl_set(AGL_WINDOWED, TRUE);
15    allegro_gl_set(AGL_DOUBLEBUFFER, 1);
16    allegro_gl_set(AGL_RENDERMETHOD, 1);  
17    allegro_gl_set(AGL_SUGGEST, AGL_COLOR_DEPTH |
18                   AGL_DOUBLEBUFFER | AGL_RENDERMETHOD |
19                   AGL_Z_DEPTH | AGL_WINDOWED); 
20 
21    set_gfx_mode(GFX_OPENGL, 640, 480, 0, 0);
22 
23    glClearColor(0.0, 0.0, 0.0, 0.0);
24}
25 
26int main()
27{
28    Init();
29    glClear(GL_COLOR_BUFFER_BIT);
30    allegro_gl_flip();
31    while (!key[KEY_ESC]);
32 
33    return 0;
34}
35END_OF_MAIN();

biscuitz

Member #5,679

March 2005

bows ty It works now.