src/gallium/targets/libgl-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 #include "pipe/p_compiler.h"
  34 #include "state_tracker/xlib_sw_winsys.h"
  35 #include "util/u_debug.h"
  36 #include "softpipe/sp_public.h"
  37 #include "llvmpipe/lp_public.h"
  38 #include "cell/ppu/cell_public.h"
  39 #include "target-helpers/wrap_screen.h"
  40 #include "xm_public.h"
  41
  42 #include "state_tracker/st_manager.h"
  43
  44 /* advertise OpenGL support */
  45 PUBLIC const int st_api_OpenGL = 1;
  46
  47 PUBLIC const struct st_module st_module_OpenGL = {
  48    .api = ST_API_OPENGL,
  49    .create_api = st_manager_create_api
  50 };
  51
  52 /* Helper function to build a subset of a driver stack consisting of
  53  * one of the software rasterizers (cell, llvmpipe, softpipe) and the
  54  * xlib winsys.
  55  *
  56  * This function could be shared, but currently causes headaches for
  57  * the build systems, particularly scons if we try.  Long term, want
  58  * to avoid having global #defines for things like GALLIUM_LLVMPIPE,
  59  * GALLIUM_CELL, etc.  Scons already eliminates those #defines, so
  60  * things that are painful for it now are likely to be painful for
  61  * other build systems in the future.
  62  */
  63 static struct pipe_screen *
  64 swrast_xlib_create_screen( Display *display )
  65 {
  66    const char *default_driver;
  67    const char *driver;
  68    struct sw_winsys *winsys;
  69    struct pipe_screen *screen = NULL;
  70
  71    /* Create the underlying winsys, which performs presents to Xlib
  72     * drawables:
  73     */
  74    winsys = xlib_create_sw_winsys( display );
  75    if (winsys == NULL)
  76       return NULL;
  77
  78 #if defined(GALLIUM_CELL)
  79    default_driver = "cell";
  80 #elif defined(GALLIUM_LLVMPIPE)
  81    default_driver = "llvmpipe";
  82 #elif defined(GALLIUM_SOFTPIPE)
  83    default_driver = "softpipe";
  84 #else
  85    default_driver = "";
  86 #endif
  87
  88    driver = debug_get_option("GALLIUM_DRIVER", default_driver);
  89
  90    /* Create a software rasterizer on top of that winsys:
  91     */
  92 #if defined(GALLIUM_CELL)
  93    if (screen == NULL &&
  94        strcmp(driver, "cell") == 0)
  95       screen = cell_create_screen( winsys );
  96 #endif
  97
  98 #if defined(GALLIUM_LLVMPIPE)
  99    if (screen == NULL &&
 100        strcmp(driver, "llvmpipe") == 0)
 101       screen = llvmpipe_create_screen( winsys );
 102 #endif
 103
 104 #if defined(GALLIUM_SOFTPIPE)
 105    if (screen == NULL)
 106       screen = softpipe_create_screen( winsys );
 107 #endif
 108
 109    if (screen == NULL)
 110       goto fail;
 111
 112    /* Inject any wrapping layers we want to here:
 113     */
 114    return gallium_wrap_screen( screen );
 115
 116 fail:
 117    if (winsys)
 118       winsys->destroy( winsys );
 119
 120    return NULL;
 121 }
 122
 123 static struct xm_driver xlib_driver =
 124 {
 125    .create_pipe_screen = swrast_xlib_create_screen,
 126    .create_st_api = st_manager_create_api,
 127 };
 128
 129
 130 /* Build the rendering stack.
 131  */
 132 static void _init( void ) __attribute__((constructor));
 133 static void _init( void )
 134 {
 135    /* Initialize the xlib libgl code, pass in the winsys:
 136     */
 137    xmesa_set_driver( &xlib_driver );
 138 }
 139
 140
 141 /***********************************************************************
 142  *
 143  * Butt-ugly hack to convince the linker not to throw away public GL
 144  * symbols (they are all referenced from getprocaddress, I guess).
 145  */
 146 extern void (*linker_foo(const unsigned char *procName))();
 147 extern void (*glXGetProcAddress(const unsigned char *procName))();
 148
 149 extern void (*linker_foo(const unsigned char *procName))()
 150 {
 151    return glXGetProcAddress(procName);
 152 }
 153
 154
 155 /**
 156  * When GLX_INDIRECT_RENDERING is defined, some symbols are missing in
 157  * libglapi.a.  We need to define them here.
 158  */
 159 #ifdef GLX_INDIRECT_RENDERING
 160
 161 #define GL_GLEXT_PROTOTYPES
 162 #include "GL/gl.h"
 163 #include "glapi/glapi.h"
 164 #include "glapi/glapitable.h"
 165 #include "glapi/glapidispatch.h"
 166
 167 #if defined(USE_MGL_NAMESPACE)
 168 #define NAME(func)  mgl##func
 169 #else
 170 #define NAME(func)  gl##func
 171 #endif
 172
 173 #define DISPATCH(FUNC, ARGS, MESSAGE)           \
 174    CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 175
 176 #define RETURN_DISPATCH(FUNC, ARGS, MESSAGE)    \
 177    return CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 178
 179 /* skip normal ones */
 180 #define _GLAPI_SKIP_NORMAL_ENTRY_POINTS
 181 #include "glapi/glapitemp.h"
 182
 183 #endif /* GLX_INDIRECT_RENDERING */