src/gallium/winsys/xlib/xlib.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Bismarck, ND., USA
   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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  *
  27  **************************************************************************/
  28
  29 /*
  30  * Authors:
  31  *   Keith Whitwell
  32  */
  33
  34 #include "xlib.h"
  35 #include "xm_winsys.h"
  36
  37 #include <stdlib.h>
  38 #include <assert.h>
  39
  40 /* Todo, replace all this with callback-structs provided by the
  41  * individual implementations.
  42  */
  43
  44 enum mode {
  45    MODE_TRACE,
  46    MODE_BRW,
  47    MODE_CELL,
  48    MODE_SOFTPIPE
  49 };
  50
  51
  52 static enum mode get_mode()
  53 {
  54    if (getenv("XMESA_TRACE"))
  55       return MODE_TRACE;
  56
  57    if (getenv("XMESA_BRW"))
  58       return MODE_BRW;
  59
  60 #ifdef GALLIUM_CELL
  61    if (!getenv("GALLIUM_NOCELL"))
  62       return MODE_CELL;
  63 #endif
  64
  65    return MODE_SOFTPIPE;
  66 }
  67
  68 static void _init( void ) __attribute__((constructor));
  69
  70 static void _init( void )
  71 {
  72    enum mode xlib_mode = get_mode();
  73
  74    switch (xlib_mode) {
  75    case MODE_TRACE:
  76 #if defined(GALLIUM_TRACE) && defined(GALLIUM_SOFTPIPE)
  77       xmesa_set_driver( &xlib_trace_driver );
  78 #endif
  79       break;
  80    case MODE_BRW:
  81 #if defined(GALLIUM_BRW)
  82       xmesa_set_driver( &xlib_brw_driver );
  83 #endif
  84       break;
  85    case MODE_CELL:
  86 #if defined(GALLIUM_CELL)
  87       xmesa_set_driver( &xlib_cell_driver );
  88 #endif
  89       break;
  90    case MODE_SOFTPIPE:
  91 #if defined(GALLIUM_SOFTPIPE)
  92       xmesa_set_driver( &xlib_softpipe_driver );
  93 #endif
  94       break;
  95    default:
  96       assert(0);
  97       break;
  98    }
  99 }
 100
 101
 102 /***********************************************************************
 103  *
 104  * Butt-ugly hack to convince the linker not to throw away public GL
 105  * symbols (they are all referenced from getprocaddress, I guess).
 106  */
 107 extern void (*linker_foo(const unsigned char *procName))();
 108 extern void (*glXGetProcAddress(const unsigned char *procName))();
 109
 110 extern void (*linker_foo(const unsigned char *procName))()
 111 {
 112    return glXGetProcAddress(procName);
 113 }