1
2/*
3 * Example of how one might use GLUT with the 3Dfx driver in full-screen mode.
4 * Note: this only works with X since we're using Mesa's GLX "hack" for
5 * using Glide.
6 *
7 * Goals:
8 *   easy setup and input event handling with GLUT
9 *   use 3Dfx hardware
10 *   automatically set MESA environment variables
11 *   don't lose mouse input focus
12 *
13 * Brian Paul   This file is in the public domain.
14 */
15
16
17#include <stdio.h>
18#include <stdlib.h>
19#include <math.h>
20#include "glut_wrap.h"
21
22
23#define WIDTH 640
24#define HEIGHT 480
25
26
27static int Window = 0;
28static int ScreenWidth, ScreenHeight;
29static GLuint Torus = 0;
30static GLfloat Xrot = 0.0, Yrot = 0.0;
31
32
33
34static void Display( void )
35{
36   static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0};
37   static GLfloat red[4] = {1.0, 0.2, 0.2, 1.0};
38   static GLfloat green[4] = {0.2, 1.0, 0.2, 1.0};
39
40   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
41
42   glPushMatrix();
43   glRotatef(Xrot, 1, 0, 0);
44   glRotatef(Yrot, 0, 1, 0);
45
46   glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue);
47   glCallList(Torus);
48
49   glRotatef(90.0, 1, 0, 0);
50   glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red);
51   glCallList(Torus);
52
53   glRotatef(90.0, 0, 1, 0);
54   glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green);
55   glCallList(Torus);
56
57   glPopMatrix();
58
59   glutSwapBuffers();
60}
61
62
63static void Reshape( int width, int height )
64{
65   float ratio = (float) width / (float) height;
66
67   ScreenWidth = width;
68   ScreenHeight = height;
69
70   /*
71    * The 3Dfx driver is limited to 640 x 480 but the X window may be larger.
72    * Enforce that here.
73    */
74   if (width > WIDTH)
75      width = WIDTH;
76   if (height > HEIGHT)
77      height = HEIGHT;
78
79   glViewport( 0, 0, width, height );
80   glMatrixMode( GL_PROJECTION );
81   glLoadIdentity();
82   glFrustum( -ratio, ratio, -1.0, 1.0, 5.0, 30.0 );
83   glMatrixMode( GL_MODELVIEW );
84   glLoadIdentity();
85   glTranslatef( 0.0, 0.0, -20.0 );
86}
87
88
89static void Key( unsigned char key, int x, int y )
90{
91   (void) x;
92   (void) y;
93   switch (key) {
94      case 27:
95         glutDestroyWindow(Window);
96         exit(0);
97         break;
98   }
99   glutPostRedisplay();
100}
101
102
103static void SpecialKey( int key, int x, int y )
104{
105   (void) x;
106   (void) y;
107   switch (key) {
108      case GLUT_KEY_UP:
109         break;
110      case GLUT_KEY_DOWN:
111         break;
112      case GLUT_KEY_LEFT:
113         break;
114      case GLUT_KEY_RIGHT:
115         break;
116   }
117   glutPostRedisplay();
118}
119
120
121static void MouseMove( int x, int y )
122{
123   Xrot = y - ScreenWidth / 2;
124   Yrot = x - ScreenHeight / 2;
125   glutPostRedisplay();
126}
127
128
129static void Init( void )
130{
131   Torus = glGenLists(1);
132   glNewList(Torus, GL_COMPILE);
133   glutSolidTorus(0.5, 2.0, 10, 20);
134   glEndList();
135
136   glEnable(GL_LIGHTING);
137   glEnable(GL_LIGHT0);
138
139   glEnable(GL_DEPTH_TEST);
140   glEnable(GL_CULL_FACE);
141}
142
143
144int main( int argc, char *argv[] )
145{
146#ifndef _WIN32
147   printf("NOTE: if you've got 3Dfx VooDoo hardware you must run this");
148   printf(" program as root.\n\n");
149   printf("Move the mouse.  Press ESC to exit.\n\n");
150#endif
151
152   /* Tell Mesa GLX to use 3Dfx driver in fullscreen mode. */
153   putenv("MESA_GLX_FX=fullscreen");
154
155   /* Disable 3Dfx Glide splash screen */
156   putenv("FX_GLIDE_NO_SPLASH=");
157
158   /* Give an initial size and position so user doesn't have to place window */
159   glutInitWindowPosition(0, 0);
160   glutInitWindowSize(WIDTH, HEIGHT);
161   glutInit( &argc, argv );
162
163   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
164
165   Window = glutCreateWindow(argv[0]);
166   if (!Window) {
167      printf("Error, couldn't open window\n");
168      exit(1);
169   }
170
171   /*
172    * Want the X window to fill the screen so that we don't have to
173    * worry about losing the mouse input focus.
174    * Note that we won't actually see the X window since we never draw
175    * to it, hence, the original X screen's contents aren't disturbed.
176    */
177   glutFullScreen();
178
179   Init();
180
181   glutReshapeFunc( Reshape );
182   glutKeyboardFunc( Key );
183   glutSpecialFunc( SpecialKey );
184   glutDisplayFunc( Display );
185   glutPassiveMotionFunc( MouseMove );
186
187   glutMainLoop();
188   return 0;
189}
190