Hi guys!
Im new to Allegro5 and OpenGL. I was really exicted when i got my first 3D cube to be drawn. but yesterday I got really depressed when I got this problem... I've googled it like 3000000 times but it seems nobody else has this horrible problem.
Im uploading a screenshot:
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As u can see it must be related with the way I configure the DEPTH BUFFER... but I really dont know what I'm doing wrong.
I'm using Code::Blocks 12.11 C++ with MINGW 4.7 and the I'm not sure what openGL version im using but it's the one provided with MINGW 4.7
And here is my whole code:
1#include <stdio.h>
2#include <allegro5/allegro.h>
3#include <gl/glu.h>
4#include <math.h>
5void DrawCube(void);
6
7int main(int argc, char **argv){
8 bool finish=false, draw= true;
9 const float FPS = 60.0;
10 int resX=1280,resY=720;
11 double Angle=90, Ratio=float(resX)/float(resY),ClippingBorder1=0,ClippingBorder2=100;
12 float x=0,z=0, y=0,rotX=0,incl=0,moveSpeed = 0.1;
13
14 ALLEGRO_DISPLAY *display = NULL;
15 if(!al_init()) {
16 fprintf(stderr, "failed to initialize allegro!\n");
17 return -1;
18 }
19
20
21 al_set_new_display_flags( ALLEGRO_OPENGL );
22 al_set_new_display_option( ALLEGRO_COLOR_SIZE, 32, ALLEGRO_REQUIRE);
23 al_set_new_display_option( ALLEGRO_DEPTH_SIZE, 24, ALLEGRO_REQUIRE);
24 al_set_new_display_option( ALLEGRO_STENCIL_SIZE, 8, ALLEGRO_REQUIRE);
25 al_set_new_display_option( ALLEGRO_AUX_BUFFERS, 0, ALLEGRO_REQUIRE);
26 al_set_new_display_option( ALLEGRO_SAMPLE_BUFFERS, 1, ALLEGRO_SUGGEST);
27 al_set_new_display_option( ALLEGRO_SAMPLES, 4, ALLEGRO_SUGGEST);
28
29 display = al_create_display(resX, resY);
30 if(!display){
31 fprintf(stderr, "failed to create display!\n");
32 return -1;
33 }
34 al_clear_to_color(al_map_rgb(0,0,0));
35 al_hide_mouse_cursor(display);
36
37 al_install_keyboard();
38 al_install_mouse();
39 ALLEGRO_KEYBOARD_STATE keyState;
40 ALLEGRO_MOUSE_STATE mouseState;
41 ALLEGRO_TIMER *timer = al_create_timer(1.0 / FPS);
42 ALLEGRO_EVENT_QUEUE *event_queue = al_create_event_queue();
43 al_register_event_source(event_queue, al_get_keyboard_event_source());
44 al_register_event_source(event_queue, al_get_mouse_event_source());
45 al_register_event_source(event_queue, al_get_timer_event_source(timer));
46 al_start_timer(timer);
47
48glEnable(GL_CULL_FACE);
49glEnable(GL_DEPTH_TEST);
50
51//glDepthMask(GL_TRUE);
52glDepthFunc(GL_LEQUAL);
53//glDepthRange(0.0f, 1.0f);
54glShadeModel(GL_FLAT);
55
56 while(!finish){
57
58 ALLEGRO_EVENT events;
59 al_wait_for_event(event_queue, &events);
60
61 if(events.type == ALLEGRO_EVENT_KEY_UP)
62 {
63 switch(events.keyboard.keycode)
64 {
65 case ALLEGRO_KEY_ESCAPE:
66 finish = true;
67 }
68 }
69 if(events.type == ALLEGRO_EVENT_TIMER)
70 {
71 al_get_keyboard_state(&keyState);
72 al_get_mouse_state(&mouseState);
73
74 rotX+=(mouseState.x-resX/2)/100.0;
75 if(incl>-1.45 && incl<1.45)
76 incl-=float(mouseState.y-resY/2)/200.0;
77 else{
78 if(incl<-1.45)incl=-1.44;
79 if(incl>1.45)incl=1.44;
80
81 }
82
83 if(al_key_down(&keyState, ALLEGRO_KEY_RIGHT))
84 rotX += 0.1;
85 if(al_key_down(&keyState, ALLEGRO_KEY_LEFT))
86 rotX -= 0.1;
87 if(al_key_down(&keyState, ALLEGRO_KEY_UP)){
88 if(incl<1.45)incl += 0.1;//limitamos el angulo max de inclinación a PI/2
89 }
90 if(al_key_down(&keyState, ALLEGRO_KEY_DOWN)){
91 if(incl>-1.45)incl -= 0.1;//limitamos el angulo min de inclinación a -PI/2
92 }
93 if(al_key_down(&keyState, ALLEGRO_KEY_A)){
94 x-=moveSpeed*cos(rotX+1.57);
95 z-=moveSpeed*sin(rotX+1.57);
96 }
97 if(al_key_down(&keyState, ALLEGRO_KEY_D)){
98 x+=moveSpeed*cos(rotX+1.57);
99 z+=moveSpeed*sin(rotX+1.57);
100 }
101 if(al_key_down(&keyState, ALLEGRO_KEY_W)){
102 x+=moveSpeed*cos(rotX);
103 z+=moveSpeed*sin(rotX);
104 }
105 if(al_key_down(&keyState, ALLEGRO_KEY_S)){
106 x-=moveSpeed*cos(rotX);
107 z-=moveSpeed*sin(rotX);
108 }
109 if(al_key_down(&keyState, ALLEGRO_KEY_Z))
110 Angle++;
111 if(al_key_down(&keyState, ALLEGRO_KEY_X))
112 Angle--;
113
114 al_set_mouse_xy(display, resX/2, resY/2);
115 draw = true;
116 }
117
118 if(draw)
119 {
120 draw = false;
121 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT| GL_STENCIL_BUFFER_BIT);
122
123 glMatrixMode(GL_PROJECTION); //Open the projection matrix as current
124 glLoadIdentity(); //clear its contents to an identity matrix (which doesn't change anything when applied)
125 gluPerspective( Angle, Ratio, ClippingBorder1, ClippingBorder2);
126 glMatrixMode(GL_MODELVIEW); //select the matrix
127 glLoadIdentity(); //clear ...
128 gluLookAt (x,y,z,x+cos(incl)*cos(rotX),y+sin(incl),z+cos(incl)*sin(rotX),0,1,0);//CameraX , CameraY, CameraZ, SceneX, SceneY, SceneZ, UpVectorApexX, UpVectorApexY, UpVectorApexZ );
129
130 DrawCube(); //Draw CUBE
131 glBegin(GL_QUADS); // Draw SINLGE FACE behing CUBE
132
133 glColor3f(0.0f,1.0f,0.0f); // Color Red
134 glVertex3f( 1.0f, 1.0f, -3.0f); // Top Right Of The Quad (Front)
135 glVertex3f(-1.0f, 1.0f, -3.0f); // Top Left Of The Quad (Front)
136 glVertex3f(-1.0f,-1.0f, -3.0f); // Bottom Left Of The Quad (Front)
137 glVertex3f( 1.0f,-1.0f, -3.0f); // Bottom Right Of The Quad (Front)
138 glEnd();
139
140 glFlush();
141 al_wait_for_vsync();
142 al_flip_display();
143 al_clear_to_color(al_map_rgb(0, 0, 0));
144 }
145 }
146
147 printf("Finalizado por el usuario.");
148 al_rest(1.0);
149 al_destroy_display(display);
150 al_destroy_timer(timer);
151 al_destroy_event_queue(event_queue);
152 return 0;
153}
154
155
156void DrawCube(void)
157{
158 // Draw The Cube Using quads
159 glColor3f(0.0f,1.0f,0.0f); // Color Blue
160 glBegin(GL_QUADS);
161 glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top)
162 glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top)
163 glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
164 glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)
165glEnd();
166 glColor3f(1.0f,0.5f,0.0f); // Color Orange
167 glBegin(GL_QUADS);
168 glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom)
169 glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom)
170 glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom)
171 glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Bottom)
172glEnd();
173 glColor3f(1.0f,0.0f,0.0f); // Color Red
174 glBegin(GL_QUADS);
175 glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
176 glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
177 glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front)
178 glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Front)
179glEnd();
180 glColor3f(1.0f,1.0f,0.0f); // Color Yellow
181 glBegin(GL_QUADS);
182 glVertex3f( 1.0f,-1.0f,-1.0f); // Top Right Of The Quad (Back)
183 glVertex3f(-1.0f,-1.0f,-1.0f); // Top Left Of The Quad (Back)
184 glVertex3f(-1.0f, 1.0f,-1.0f); // Bottom Left Of The Quad (Back)
185 glVertex3f( 1.0f, 1.0f,-1.0f); // Bottom Right Of The Quad (Back)
186glEnd();
187
188 glColor3f(0.0f,0.0f,1.0f); // Color Blue
189 glBegin(GL_QUADS);
190 glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
191 glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left)
192 glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left)
193 glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Left)
194glEnd();
195 glColor3f(1.0f,0.0f,1.0f); // Color Violet
196 glBegin(GL_QUADS);
197 glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right)
198 glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
199 glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right)
200 glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Right)
201 glEnd(); // End Drawing The Cube
202
203}
THANKYOU so much in advance!! Id be so pleased if you can solve this...
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Im hitting my head against the wall... I really dont know what to do to solve this D:
