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_CELL,
  46    MODE_LLVMPIPE,
  47    MODE_SOFTPIPE
  48 };
  49
  50 /* advertise OpenGL support */
  51 PUBLIC const int st_api_OpenGL = 1;
  52
  53 static enum mode get_mode()
  54 {
  55 #ifdef GALLIUM_CELL
  56    if (!getenv("GALLIUM_NOCELL"))
  57       return MODE_CELL;
  58 #endif
  59
  60 #if defined(GALLIUM_LLVMPIPE)
  61    return MODE_LLVMPIPE;
  62 #else
  63    return MODE_SOFTPIPE;
  64 #endif
  65 }
  66
  67 static void _init( void ) __attribute__((constructor));
  68
  69 static void _init( void )
  70 {
  71    enum mode xlib_mode = get_mode();
  72
  73    switch (xlib_mode) {
  74    case MODE_CELL:
  75 #if defined(GALLIUM_CELL)
  76       xmesa_set_driver( &xlib_cell_driver );
  77 #endif
  78       break;
  79    case MODE_LLVMPIPE:
  80 #if defined(GALLIUM_LLVMPIPE)
  81       xmesa_set_driver( &xlib_llvmpipe_driver );
  82 #endif
  83       break;
  84    case MODE_SOFTPIPE:
  85 #if defined(GALLIUM_SOFTPIPE)
  86       xmesa_set_driver( &xlib_softpipe_driver );
  87 #endif
  88       break;
  89    default:
  90       assert(0);
  91       break;
  92    }
  93 }
  94
  95
  96 /***********************************************************************
  97  *
  98  * Butt-ugly hack to convince the linker not to throw away public GL
  99  * symbols (they are all referenced from getprocaddress, I guess).
 100  */
 101 extern void (*linker_foo(const unsigned char *procName))();
 102 extern void (*glXGetProcAddress(const unsigned char *procName))();
 103
 104 extern void (*linker_foo(const unsigned char *procName))()
 105 {
 106    return glXGetProcAddress(procName);
 107 }
 108
 109
 110 /**
 111  * When GLX_INDIRECT_RENDERING is defined, some symbols are missing in
 112  * libglapi.a.  We need to define them here.
 113  */
 114 #ifdef GLX_INDIRECT_RENDERING
 115
 116 #define GL_GLEXT_PROTOTYPES
 117 #include "GL/gl.h"
 118 #include "glapi/glapi.h"
 119 #include "glapi/glapitable.h"
 120 #include "glapi/glapidispatch.h"
 121
 122 #if defined(USE_MGL_NAMESPACE)
 123 #define NAME(func)  mgl##func
 124 #else
 125 #define NAME(func)  gl##func
 126 #endif
 127
 128 #define DISPATCH(FUNC, ARGS, MESSAGE)           \
 129    CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 130
 131 #define RETURN_DISPATCH(FUNC, ARGS, MESSAGE)    \
 132    return CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 133
 134 /* skip normal ones */
 135 #define _GLAPI_SKIP_NORMAL_ENTRY_POINTS
 136 #include "glapi/glapitemp.h"
 137
 138 #endif /* GLX_INDIRECT_RENDERING */