progs/egl/eglut/eglut_screen.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <sys/time.h>
   4
   5 #define EGL_EGLEXT_PROTOTYPES
   6 #include "EGL/egl.h"
   7 #include "EGL/eglext.h"
   8
   9 #include "eglutint.h"
  10
  11 #define MAX_MODES 100
  12
  13 static EGLScreenMESA kms_screen;
  14 static EGLModeMESA kms_mode;
  15 static EGLint kms_width, kms_height;
  16
  17 void
  18 _eglutNativeInitDisplay(void)
  19 {
  20    _eglut->native_dpy = EGL_DEFAULT_DISPLAY;
  21    _eglut->surface_type = EGL_SCREEN_BIT_MESA;
  22 }
  23
  24 void
  25 _eglutNativeFiniDisplay(void)
  26 {
  27    kms_screen = 0;
  28    kms_mode = 0;
  29    kms_width = 0;
  30    kms_height = 0;
  31 }
  32
  33 static void
  34 init_kms(void)
  35 {
  36    EGLModeMESA modes[MAX_MODES];
  37    EGLint num_screens, num_modes;
  38    EGLint width, height, best_mode;
  39    EGLint i;
  40
  41    if (!eglGetScreensMESA(_eglut->dpy, &kms_screen, 1, &num_screens) ||
  42          !num_screens)
  43       _eglutFatal("eglGetScreensMESA failed\n");
  44
  45    if (!eglGetModesMESA(_eglut->dpy, kms_screen,
  46             modes, MAX_MODES, &num_modes) || !num_modes)
  47       _eglutFatal("eglGetModesMESA failed!\n");
  48
  49    printf("Found %d modes:\n", num_modes);
  50
  51    best_mode = 0;
  52    width = 0;
  53    height = 0;
  54    for (i = 0; i < num_modes; i++) {
  55       EGLint w, h;
  56       eglGetModeAttribMESA(_eglut->dpy, modes[i], EGL_WIDTH, &w);
  57       eglGetModeAttribMESA(_eglut->dpy, modes[i], EGL_HEIGHT, &h);
  58       printf("%3d: %d x %d\n", i, w, h);
  59       if (w > width && h > height) {
  60          width = w;
  61          height = h;
  62          best_mode = i;
  63       }
  64    }
  65
  66    printf("Will use screen size: %d x %d\n", width, height);
  67
  68    kms_mode = modes[best_mode];
  69    kms_width = width;
  70    kms_height = height;
  71 }
  72
  73 void
  74 _eglutNativeInitWindow(struct eglut_window *win, const char *title,
  75                        int x, int y, int w, int h)
  76 {
  77    EGLint surf_attribs[16];
  78    EGLint i;
  79    const char *exts;
  80
  81    exts = eglQueryString(_eglut->dpy, EGL_EXTENSIONS);
  82    if (!exts || !strstr(exts, "EGL_MESA_screen_surface"))
  83       _eglutFatal("EGL_MESA_screen_surface is not supported\n");
  84
  85    init_kms();
  86
  87    i = 0;
  88    surf_attribs[i++] = EGL_WIDTH;
  89    surf_attribs[i++] = kms_width;
  90    surf_attribs[i++] = EGL_HEIGHT;
  91    surf_attribs[i++] = kms_height;
  92    surf_attribs[i++] = EGL_NONE;
  93
  94    /* create surface */
  95    win->native.u.surface = eglCreateScreenSurfaceMESA(_eglut->dpy,
  96          win->config, surf_attribs);
  97    if (win->native.u.surface == EGL_NO_SURFACE)
  98       _eglutFatal("eglCreateScreenSurfaceMESA failed\n");
  99
 100    if (!eglShowScreenSurfaceMESA(_eglut->dpy, kms_screen,
 101             win->native.u.surface, kms_mode))
 102       _eglutFatal("eglShowScreenSurfaceMESA failed\n");
 103
 104    win->native.width = kms_width;
 105    win->native.height = kms_height;
 106 }
 107
 108 void
 109 _eglutNativeFiniWindow(struct eglut_window *win)
 110 {
 111    eglShowScreenSurfaceMESA(_eglut->dpy,
 112          kms_screen, EGL_NO_SURFACE, 0);
 113    eglDestroySurface(_eglut->dpy, win->native.u.surface);
 114 }
 115
 116 void
 117 _eglutNativeEventLoop(void)
 118 {
 119    int start = _eglutNow();
 120    int frames = 0;
 121
 122    _eglut->redisplay = 1;
 123
 124    while (1) {
 125       struct eglut_window *win = _eglut->current;
 126       int now = _eglutNow();
 127
 128       if (now - start > 5000) {
 129          double elapsed = (double) (now - start) / 1000.0;
 130
 131          printf("%d frames in %3.1f seconds = %6.3f FPS\n",
 132                frames, elapsed, frames / elapsed);
 133
 134          start = now;
 135          frames = 0;
 136
 137          /* send escape */
 138          if (win->keyboard_cb)
 139             win->keyboard_cb(27);
 140       }
 141
 142       if (_eglut->idle_cb)
 143          _eglut->idle_cb();
 144
 145       if (_eglut->redisplay) {
 146          _eglut->redisplay = 0;
 147
 148          if (win->display_cb)
 149             win->display_cb();
 150          eglSwapBuffers(_eglut->dpy, win->surface);
 151          frames++;
 152       }
 153    }
 154 }