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