progs/miniglx/miniglxtest.c

   1 /* $Id: miniglxtest.c,v 1.3 2004/03/25 14:58:39 brianp Exp $ */
   2
   3 /*
   4  * Test the mini GLX interface.
   5  */
   6
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <GL/gl.h>
  12 #define USE_MINI_GLX 1
  13 #if USE_MINI_GLX
  14 #include <GL/miniglx.h>
  15 #else
  16 #include <GL/glx.h>
  17 #endif
  18
  19 #define FRONTBUFFER 1
  20 #define NR          6
  21 #define DO_SLEEPS   1
  22 #define NR_DISPLAYS 2
  23
  24 GLXContext ctx;
  25
  26
  27 static void _subset_Rectf( GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2 )
  28 {
  29    glBegin( GL_QUADS );
  30    glVertex2f( x1, y1 );
  31    glVertex2f( x2, y1 );
  32    glVertex2f( x2, y2 );
  33    glVertex2f( x1, y2 );
  34    glEnd();
  35 }
  36
  37
  38
  39 static void redraw( Display *dpy, Window w, int rot )
  40 {
  41    printf("Redraw event\n");
  42
  43 #if FRONTBUFFER
  44     glDrawBuffer( GL_FRONT );
  45 #else
  46 /*     glDrawBuffer( GL_BACK );    */
  47 #endif
  48
  49    glClearColor( rand()/(float)RAND_MAX,
  50                  rand()/(float)RAND_MAX,
  51                  rand()/(float)RAND_MAX,
  52                  1);
  53
  54    glClear( GL_COLOR_BUFFER_BIT );
  55
  56 #if 1
  57    glColor3f( rand()/(float)RAND_MAX,
  58               rand()/(float)RAND_MAX,
  59               rand()/(float)RAND_MAX );
  60    glPushMatrix();
  61    glRotatef(rot, 0, 0, 1);
  62    glScalef(.5, .5, .5);
  63    _subset_Rectf( -1, -1, 1, 1 );
  64    glPopMatrix();
  65 #endif
  66
  67 #if FRONTBUFFER
  68    glFlush();
  69 #else
  70    glXSwapBuffers( dpy, w );
  71 #endif
  72    glFinish();
  73 }
  74
  75
  76 static Window make_rgb_db_window( Display *dpy,
  77                                   unsigned int width, unsigned int height )
  78 {
  79    int attrib[] = { GLX_RGBA,
  80                     GLX_RED_SIZE, 1,
  81                     GLX_GREEN_SIZE, 1,
  82                     GLX_BLUE_SIZE, 1,
  83 #if !FRONTBUFFER
  84                     GLX_DOUBLEBUFFER,
  85 #endif
  86                     None };
  87    int scrnum;
  88    XSetWindowAttributes attr;
  89    unsigned long mask;
  90    Window root;
  91    Window win;
  92    XVisualInfo *visinfo;
  93
  94    scrnum = 0;
  95    root = RootWindow( dpy, scrnum );
  96
  97    if (!(visinfo = glXChooseVisual( dpy, scrnum, attrib ))) {
  98       printf("Error: couldn't get an RGB, Double-buffered visual\n");
  99       exit(1);
 100    }
 101
 102    if(!(ctx = glXCreateContext( dpy, visinfo, NULL, True ))) {
 103       printf("Error: glXCreateContext failed\n");
 104       exit(1);
 105    }
 106
 107    /* window attributes */
 108    attr.background_pixel = 0;
 109    attr.border_pixel = 0;
 110    attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
 111    attr.event_mask = StructureNotifyMask | ExposureMask;
 112    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 113
 114    win = XCreateWindow( dpy, root, 0, 0, width, height,
 115                         0, visinfo->depth, InputOutput,
 116                         visinfo->visual, mask, &attr );
 117    if (!win) {
 118       printf("Error: XCreateWindow failed\n");
 119       exit(1);
 120    }
 121
 122    glXMakeCurrent( dpy, win, ctx );
 123
 124    glViewport(0, 0, width, height);
 125
 126    return win;
 127 }
 128
 129
 130 static void event_loop( Display *dpy, Window win )
 131 {
 132    int i;
 133
 134    printf("Hang on... drawing %d frames\n", NR);
 135    for (i = 0; i < NR; i++) {
 136       redraw( dpy, win, i*10 );
 137       if (DO_SLEEPS) {
 138          printf("sleep(1)\n");
 139          sleep(1);
 140       }
 141    }
 142 }
 143
 144
 145 static int foo( void )
 146 {
 147    Display *dpy;
 148    Window win;
 149
 150    dpy = XOpenDisplay(NULL);
 151    if (!dpy) {
 152       printf("Error: XOpenDisplay failed\n");
 153       return 1;
 154    }
 155
 156    win = make_rgb_db_window( dpy, 800, 600);
 157
 158    srand(getpid());
 159
 160    glShadeModel( GL_FLAT );
 161    glClearColor( 0.5, 0.5, 0.5, 1.0 );
 162
 163    XMapWindow( dpy, win );
 164
 165    {
 166       XEvent e;
 167       while (1) {
 168          XNextEvent( dpy, &e );
 169          if (e.type == MapNotify && e.xmap.window == win) {
 170             break;
 171          }
 172       }
 173    }
 174
 175    event_loop( dpy, win );
 176
 177    glXDestroyContext( dpy, ctx );
 178    XDestroyWindow( dpy, win );
 179
 180    XCloseDisplay( dpy );
 181
 182    return 0;
 183 }
 184
 185
 186 int main()
 187 {
 188    int i;
 189    for (i = 0 ; i < NR_DISPLAYS ; i++) {
 190       if (foo() != 0)
 191          break;
 192    }
 193
 194    return 0;
 195 }