src/egl/main/eglx.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 /**
  30  * X-specific EGL code.
  31  *
  32  * Any glue code needed to make EGL work with X is placed in this file.
  33  */
  34
  35
  36 #include <assert.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <X11/Xlib.h>
  40
  41 #include "egldriver.h"
  42 #include "egllog.h"
  43 #include "eglstring.h"
  44 #include "eglx.h"
  45
  46
  47 static const char *DefaultGLXDriver = "egl_glx";
  48 static const char *DefaultSoftDriver = "egl_softpipe";
  49
  50
  51 /**
  52  * Given an X Display ptr (at dpy->Xdpy) try to determine the appropriate
  53  * device driver.  Return its name.
  54  *
  55  * This boils down to whether to use the egl_glx.so driver which will
  56  * load a DRI driver or the egl_softpipe.so driver that'll do software
  57  * rendering on Xlib.
  58  */
  59 const char *
  60 _xeglChooseDriver(_EGLDisplay *dpy)
  61 {
  62 #ifdef _EGL_PLATFORM_X
  63    _XPrivDisplay xdpy;
  64    int screen;
  65    const char *driverName;
  66
  67    assert(dpy);
  68
  69    if (!dpy->Xdpy) {
  70       dpy->Xdpy = XOpenDisplay(NULL);
  71       if (!dpy->Xdpy) {
  72          /* can't open X display -> can't use X-based driver */
  73          return NULL;
  74       }
  75    }
  76    xdpy = (_XPrivDisplay) dpy->Xdpy;
  77
  78    assert(dpy->Xdpy);
  79
  80    screen = DefaultScreen(dpy->Xdpy);
  81
  82    /* See if we can choose a DRI/DRM driver */
  83    driverName = _eglChooseDRMDriver(screen);
  84    if (driverName) {
  85       free((void *) driverName);
  86       driverName = _eglstrdup(DefaultGLXDriver);
  87    }
  88    else {
  89       driverName = _eglstrdup(DefaultSoftDriver);
  90    }
  91
  92    _eglLog(_EGL_DEBUG, "_xeglChooseDriver: %s", driverName);
  93
  94    return driverName;
  95 #else
  96    return NULL;
  97 #endif
  98 }
  99
 100