[AllegroGL] Doesn't render nothing!
Niunio

I decided to translate all NeHe's tutorials to AllegroGL to learn more about OpenGL and 3D programming, but I have a problem with the first one. It compiles without errors but it shows a black window and doesn't check the keyboard. I can't find what's wrong with it.

The source:

1/*
2 * This code is a translation of the NeHe OpenGL Tutorial.
3 * The original one was writen by Jeff Molofee 2000.
4 * It was translated by Ñuño Martínez 2006.
5 *
6 * Visit NeHe's site at nehe.gamedev.net
7 */
8 
9#include <alleggl.h> /* Header file for Allegro and AllegroGL. */
10#include <GL/gl.h> /* Header file for the OpenGL32 library. */
11#include <GL/glu.h> /* Header file for the GLu32 library. */
12 
13 
14 
15/* Variables. */
16int FullScreen = FALSE; /* Fullscreen flag set to windowed mode by default. */
17 
18 
19 
20/* Function prototypes. */
21void ResizeGLScene (GLsizei Width, GLsizei Height); /* Resize and initialize the OpenGL window. */
22int InitGL (void); /* All setup for OpenGL goes here. */
23int DrawGLScene (void); /* Here's where we do all the drawing. */
24int CreateGLWindow (char* Title, int Width, int Height, int bpp,
25 int FullScreenFlag); /* Create the OpenGL window. */
26 
27 
28 
29/* main:
30 * Entry point of our application. */
31int main (void)
32{
33 int Done = FALSE; /* Bool variable to exit loop. */
34 
35/* Initialise Allegro and AllegroGL. */
36 set_uformat (U_ASCII);
37 if (allegro_init () != 0) {
38 allegro_message ("Error initialising Allegro.\n");
39 return EXIT_FAILURE;
40 }
41 install_timer ();
42 install_keyboard ();
43 if (install_allegro_gl () < 0) {
44 allegro_message ("Error initialising AllegroGL.\n");
45 return EXIT_FAILURE;
46 }
47/* Create our OpenGL window. */
48 if (!CreateGLWindow ("NeHe's First Polygon Tutorial", 640, 480, 16, FullScreen))
49 return EXIT_FAILURE; /* Quit if window was not created. */
50/* Loop that runs until Done = TRUE. */
51 while (!Done) {
52 if (keyboard_needs_poll ()) poll_keyboard ();
53 /* Was ESC Pressed? */
54 if (key[KEY_ESC])
55 Done = TRUE; /* ESC signalled a quit. */
56 else {
57 DrawGLScene(); /* Draw the scene. */
58 allegro_gl_flip (); /* Swap buffers (double buffering). */
59 }
60 /* Is F1 being pressed? */
61 if (key[KEY_F1]) {
62 key[KEY_F1] = 0; /* If so make key FALSE. */
63 /* Kill our current window. */
64 set_gfx_mode (GFX_TEXT, 0, 0, 0, 0);
65 /* Toggle fullscreen / windowed mode. */
66 FullScreen = !FullScreen;
67 /* Recreate Our OpenGL window. */
68 if (!CreateGLWindow ("NeHe's First Polygon Tutorial", 640, 480, 16,
69 FullScreen))
70 return EXIT_FAILURE; /* Quit if window was not created. */
71 }
72 }
73 return EXIT_SUCCESS;
74}
75END_OF_MAIN () /* Needed by Allegro. */
76 
77 
78 
79/* ResizeGLScene:
80 * Resize and initialize the OpenGL window. */
81void ResizeGLScene (GLsizei Width, GLsizei Height)
82{
83/* Prevent a "divide by zero" error. */
84 if (Height == 0) Height = 1;
85/* Reset the current viewport. */
86 glViewport (0, 0, Width, Height);
87/* Select the projection matrix. */
88 glMatrixMode (GL_PROJECTION);
89/* Calculate the aspect ratio of the window.*/
90 gluPerspective (45.0f, (GLfloat)Width / (GLfloat)Height, 0.1f, 100.0f);
91/* Select the modelview matrix. */
92 glMatrixMode (GL_MODELVIEW);
93/* Reset the modelview matrix.*/
94 glLoadIdentity ();
95}
96 
97 
98 
99/* InitGL:
100 * All setup for OpenGL goes here. */
101int InitGL (void)
102{
103/* Enables smooth shading. */
104 glShadeModel (GL_SMOOTH);
105/* Black background. */
106 glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
107/* Depth buffer setup. */
108 glClearDepth (1.0f);
109 glEnable (GL_DEPTH_TEST);
110 glDepthFunc (GL_LEQUAL);
111/* Really nice perspective calculations. */
112 glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
113/* Initialization went 0k. */
114 return TRUE;
115}
116 
117 
118 
119/* DrawGLScene:
120 * Here's where we do all the drawing. */
121int DrawGLScene (void)
122{
123/* Clear the screen and the depth buffer. */
124 glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
125/* Reset the current modelview matrix. */
126 glLoadIdentity ();
127/* Move left 1.5 units and into the screen 6.0. */
128 glTranslatef (-1.5f, 0.0f, -6.0f);
129 glBegin (GL_TRIANGLES); /* Drawing using triangles. */
130 glVertex3f ( 0.0f, 1.0f, 0.0f); /* Top. */
131 glVertex3f (-1.0f, -1.0f, 0.0f); /* Bottom Left. */
132 glVertex3f ( 1.0f, -1.0f, 0.0f); /* Bottom Right. */
133 glEnd (); /* Finished drawing the triangle. */
134/* Move right 3 units. */
135 glTranslatef (3.0f, 0.0f, 0.0f);
136 glBegin (GL_QUADS); /* Draw a quad. */
137 glVertex3f (-1.0f, 1.0f, 0.0f); /* Top Left. */
138 glVertex3f ( 1.0f, 1.0f, 0.0f); /* Top Right. */
139 glVertex3f ( 1.0f, -1.0f, 0.0f); /* Bottom Right. */
140 glVertex3f (-1.0f, -1.0f, 0.0f); /* Bottom Left. */
141 glEnd (); /* Done drawing the quad. */
142 glFlush ();
143/* Everything went 0k. */
144 return TRUE;
145}
146 
147 
148 
149/* CreateGLWindow;
150 * Create the OpenGL window. */
151int CreateGLWindow (char* Title, int Width, int Height, int bpp,
152 int FullScreenFlag)
153{
154/* Set the global fullscreen flag. */
155 FullScreen = FullScreenFlag;
156/* Set window configuration. */
157 allegro_gl_set (AGL_COLOR_DEPTH, bpp);
158 allegro_gl_set (AGL_WINDOWED, !FullScreen);
159 allegro_gl_set (AGL_RENDERMETHOD, TRUE);
160 allegro_gl_set (AGL_DOUBLEBUFFER, TRUE);
161 allegro_gl_set (AGL_Z_DEPTH, 16);
162 allegro_gl_set (AGL_SUGGEST,
163 AGL_COLOR_DEPTH | AGL_WINDOWED | AGL_RENDERMETHOD |
164 AGL_DOUBLEBUFFER | AGL_Z_DEPTH);
165/* Open window. */
166 if (set_gfx_mode (GFX_OPENGL, Width, Height, 0, 0) != 0) {
167 allegro_message ("Window creation error.");
168 return FALSE;
169 }
170 set_window_title (Title);
171/* Initialize our newly created OpenGL window. */
172 if (!InitGL ()) {
173 set_gfx_mode (GFX_TEXT, 0, 0, 0, 0); /* Reset the display. */
174 allegro_message ("Initialization Failed.");
175 return FALSE;
176 }
177/* Everything went 0k. */
178 return TRUE;
179}

The command used to compile: 

gcc -s -Wall -DDEBUGMODE -Isrc -o lesson02.bin lesson02.c -lagl `allegro-config --libs` -lGL -lGLU

I'm using Allegro 4.2 and one of the AllegroGL VSN versions that Miran posts here.

razor

EDIT: Oops didn't see the flip command.

What OS?

Niunio

I'm using the latest stable and updated Debian Sarge Linux.

Now, I've re-compiled an AllegroGL project I did before to update AllegroGL and it renders the objects but doesn't check keyboard nor mouse. Maybe it's an AllegroGL's bug?

razor

You never setup the projection matrix.

EDIT: Here's a quick fix

1int InitGL (void)
2{
3/* Enables smooth shading. */
4 ResizeGLScene(SCREEN_W, SCREEN_H); //added
5 glShadeModel (GL_SMOOTH);
6/* Black background. */
7 glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
8/* Depth buffer setup. */
9 glClearDepth (1.0f);
10 glEnable (GL_DEPTH_TEST);
11 glDepthFunc (GL_LEQUAL);
12/* Really nice perspective calculations. */
13 glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
14/* Initialization went 0k. */
15 return TRUE;
16}

Niunio

Good, now it renders, but keyboard doesn't work! ???

razor

Thats strange... the keyboard works when I compile that exact code, but I'm running WinXP Sp2 W/ MingW. Sounds like something funky. Does input work in other allegro programs?

Niunio

Yes, it does. Also in OpenGL programs. Only AllegroGL has problems, but if I use the latest stable version seems to work right...

razor

Hmm, this might be a question for the AllegroGL Developers then... cause maybe something is up with the CVS version and your hardware or something.

BrknPhoenix

edit: Nevermind, you have a poll_keyboard()...

Milan Mimica

It works here, on linux too. Can you check install_keyboard() return value? Which version of X11 do you have?

Thomas Fjellstrom

Actually, you should never need to call poll_keyboard...

Niunio
Milan Mimica said:

Can you check install_keyboard() return value?

It returns 0.

Milan Mimica said:

Which version of X11 do you have?

I am not sure. Synaptic says that package "xfree86-common" is version "4.3.0.dfsg.1-14sarge1" and same for packages "xbase-clients", "x-dev" and "xlibs-dev".

Thomas Fjellstom said:

Actually, you should never need to call poll_keyboard...

I know. I put it trying to fix the problem.

Milan Mimica

Seems the version is 4.3.0 - a bit old but it definitely should work.

You should build a debug version of AGL and check the allegro.log that your program will produce.

Oh, and try to switch in and out od the program (atl+tab). It usually helps ;D

And which version of AGL exactly are you using? Where did you get it?

edit: and do AGL examples work?

Niunio

I can't rebuild the library... Can't find the makefile! And I don't remember how I did it! I think I'll try to get the latest SVN and try to rebuild it.

[edit]Running "autoconf":
configure.in:140: error: possibly undefined macro: AM_PATH_ALLEGRO

Milan Mimica

run
aclocal -I usr/local/share/aclocal
if your allegro.m4 is in usr/local/share/aclocal

Niunio

[edit]Forget it, I've find it in "automake" package.

AAAAAAAAAAARG...!

Quote:

configure: creating ./config.status
config.status: creating makefile
config.status: creating include/alleggl_config.h
config.status: error: cannot find input file: include/alleggl_config.hin

Somebody hates me... sure!>:(

Milan Mimica

autoheader

edit: yeah, that should be fixed in SVN

Niunio

I've downloaded the AllegroGL 0.4.0 RC4 and I've find that the examples runs except 3 of them: exmipmaps, exgui and excamera. They show the first frame(s) and fails whith next message:

xlib: unexpected async reply (sequence 0x11c)!

Then I must kill the process.

I've attached the log files for each example.

[edit]I confused myself... :P sorry

Milan Mimica

;D

you read mine

Niunio

Ok. AllegroGL 0.4.0 RC4 seems to work. Next time I'll check if a newer version is avaiable before to ask.

:-[

Thread #586193. Printed from Allegro.cc