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    struct sw_winsys *winsys;
  67    struct pipe_screen *screen = NULL;
  68
  69    /* Create the underlying winsys, which performs presents to Xlib
  70     * drawables:
  71     */
  72    winsys = xlib_create_sw_winsys( display );
  73    if (winsys == NULL)
  74       return NULL;
  75
  76    /* Create a software rasterizer on top of that winsys:
  77     */
  78 #if defined(GALLIUM_CELL)
  79    if (screen == NULL &&
  80        !debug_get_bool_option("GALLIUM_NO_CELL", FALSE))
  81       screen = cell_create_screen( winsys );
  82 #endif
  83
  84 #if defined(GALLIUM_LLVMPIPE)
  85    if (screen == NULL &&
  86        !debug_get_bool_option("GALLIUM_NO_LLVM", FALSE))
  87       screen = llvmpipe_create_screen( winsys );
  88 #endif
  89
  90    if (screen == NULL)
  91       screen = softpipe_create_screen( winsys );
  92
  93    if (screen == NULL)
  94       goto fail;
  95
  96    /* Inject any wrapping layers we want to here:
  97     */
  98    return gallium_wrap_screen( screen );
  99
 100 fail:
 101    if (winsys)
 102       winsys->destroy( winsys );
 103
 104    return NULL;
 105 }
 106
 107 struct xm_driver xlib_driver =
 108 {
 109    .create_pipe_screen = swrast_xlib_create_screen,
 110 };
 111
 112
 113 /* Build the rendering stack.
 114  */
 115 static void _init( void ) __attribute__((constructor));
 116 static void _init( void )
 117 {
 118    /* Initialize the xlib libgl code, pass in the winsys:
 119     */
 120    xmesa_set_driver( &xlib_driver );
 121 }
 122
 123
 124 /***********************************************************************
 125  *
 126  * Butt-ugly hack to convince the linker not to throw away public GL
 127  * symbols (they are all referenced from getprocaddress, I guess).
 128  */
 129 extern void (*linker_foo(const unsigned char *procName))();
 130 extern void (*glXGetProcAddress(const unsigned char *procName))();
 131
 132 extern void (*linker_foo(const unsigned char *procName))()
 133 {
 134    return glXGetProcAddress(procName);
 135 }
 136
 137
 138 /**
 139  * When GLX_INDIRECT_RENDERING is defined, some symbols are missing in
 140  * libglapi.a.  We need to define them here.
 141  */
 142 #ifdef GLX_INDIRECT_RENDERING
 143
 144 #define GL_GLEXT_PROTOTYPES
 145 #include "GL/gl.h"
 146 #include "glapi/glapi.h"
 147 #include "glapi/glapitable.h"
 148 #include "glapi/glapidispatch.h"
 149
 150 #if defined(USE_MGL_NAMESPACE)
 151 #define NAME(func)  mgl##func
 152 #else
 153 #define NAME(func)  gl##func
 154 #endif
 155
 156 #define DISPATCH(FUNC, ARGS, MESSAGE)           \
 157    CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 158
 159 #define RETURN_DISPATCH(FUNC, ARGS, MESSAGE)    \
 160    return CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 161
 162 /* skip normal ones */
 163 #define _GLAPI_SKIP_NORMAL_ENTRY_POINTS
 164 #include "glapi/glapitemp.h"
 165
 166 #endif /* GLX_INDIRECT_RENDERING */