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 "util/u_debug.h"
  35 #include "target-helpers/wrap_screen.h"
  36 #include "state_tracker/xlib_sw_winsys.h"
  37 #include "xm_public.h"
  38
  39 #include "state_tracker/st_api.h"
  40 #include "state_tracker/st_gl_api.h"
  41
  42 /* Helper function to choose and instantiate one of the software rasterizers:
  43  * cell, llvmpipe, softpipe.
  44  *
  45  * This function could be shared, but currently causes headaches for
  46  * the build systems, particularly scons if we try.  Long term, want
  47  * to avoid having global #defines for things like GALLIUM_LLVMPIPE,
  48  * GALLIUM_CELL, etc.  Scons already eliminates those #defines, so
  49  * things that are painful for it now are likely to be painful for
  50  * other build systems in the future.
  51  *
  52  * Copies (full or partial):
  53  *    targets/libgl-xlib
  54  *    targets/graw-xlib
  55  *    targets/dri-swrast
  56  *    winsys/sw/drm
  57  *    drivers/sw
  58  *
  59  */
  60
  61 #ifdef GALLIUM_SOFTPIPE
  62 #include "softpipe/sp_public.h"
  63 #endif
  64
  65 #ifdef GALLIUM_LLVMPIPE
  66 #include "llvmpipe/lp_public.h"
  67 #endif
  68
  69 #ifdef GALLIUM_CELL
  70 #include "cell/ppu/cell_public.h"
  71 #endif
  72
  73 #ifdef GALLIUM_GALAHAD
  74 #include "galahad/glhd_public.h"
  75 #endif
  76
  77 static struct pipe_screen *
  78 swrast_create_screen(struct sw_winsys *winsys)
  79 {
  80    const char *default_driver;
  81    const char *driver;
  82    struct pipe_screen *screen = NULL;
  83
  84 #if defined(GALLIUM_CELL)
  85    default_driver = "cell";
  86 #elif defined(GALLIUM_LLVMPIPE)
  87    default_driver = "llvmpipe";
  88 #elif defined(GALLIUM_SOFTPIPE)
  89    default_driver = "softpipe";
  90 #else
  91    default_driver = "";
  92 #endif
  93
  94    driver = debug_get_option("GALLIUM_DRIVER", default_driver);
  95
  96 #if defined(GALLIUM_CELL)
  97    if (screen == NULL && strcmp(driver, "cell") == 0)
  98       screen = cell_create_screen( winsys );
  99 #endif
 100
 101 #if defined(GALLIUM_LLVMPIPE)
 102    if (screen == NULL && strcmp(driver, "llvmpipe") == 0)
 103       screen = llvmpipe_create_screen( winsys );
 104 #endif
 105
 106 #if defined(GALLIUM_SOFTPIPE)
 107    if (screen == NULL)
 108       screen = softpipe_create_screen( winsys );
 109 #endif
 110
 111 #if defined(GALLIUM_GALAHAD)
 112    if (screen) {
 113       struct pipe_screen *galahad_screen = galahad_screen_create(screen);
 114       if (galahad_screen)
 115          screen = galahad_screen;
 116    }
 117 #endif
 118
 119    return screen;
 120 }
 121
 122 /* Helper function to build a subset of a driver stack consisting of
 123  * one of the software rasterizers (cell, llvmpipe, softpipe) and the
 124  * xlib winsys.
 125  */
 126 static struct pipe_screen *
 127 swrast_xlib_create_screen( Display *display )
 128 {
 129    struct sw_winsys *winsys;
 130    struct pipe_screen *screen = NULL;
 131
 132    /* Create the underlying winsys, which performs presents to Xlib
 133     * drawables:
 134     */
 135    winsys = xlib_create_sw_winsys( display );
 136    if (winsys == NULL)
 137       return NULL;
 138
 139    /* Create a software rasterizer on top of that winsys:
 140     */
 141    screen = swrast_create_screen( winsys );
 142    if (screen == NULL)
 143       goto fail;
 144
 145    /* Inject any wrapping layers we want to here:
 146     */
 147    return gallium_wrap_screen( screen );
 148
 149 fail:
 150    if (winsys)
 151       winsys->destroy( winsys );
 152
 153    return NULL;
 154 }
 155
 156 static struct xm_driver xlib_driver =
 157 {
 158    .create_pipe_screen = swrast_xlib_create_screen,
 159    .create_st_api = st_gl_api_create,
 160 };
 161
 162
 163 /* Build the rendering stack.
 164  */
 165 static void _init( void ) __attribute__((constructor));
 166 static void _init( void )
 167 {
 168    /* Initialize the xlib libgl code, pass in the winsys:
 169     */
 170    xmesa_set_driver( &xlib_driver );
 171 }
 172
 173
 174 /***********************************************************************
 175  *
 176  * Butt-ugly hack to convince the linker not to throw away public GL
 177  * symbols (they are all referenced from getprocaddress, I guess).
 178  */
 179 extern void (*linker_foo(const unsigned char *procName))();
 180 extern void (*glXGetProcAddress(const unsigned char *procName))();
 181
 182 extern void (*linker_foo(const unsigned char *procName))()
 183 {
 184    return glXGetProcAddress(procName);
 185 }
 186
 187
 188 /**
 189  * When GLX_INDIRECT_RENDERING is defined, some symbols are missing in
 190  * libglapi.a.  We need to define them here.
 191  */
 192 #ifdef GLX_INDIRECT_RENDERING
 193
 194 #define GL_GLEXT_PROTOTYPES
 195 #include "GL/gl.h"
 196 #include "glapi/glapi.h"
 197 #include "glapi/glapitable.h"
 198 #include "glapi/glapidispatch.h"
 199
 200 #if defined(USE_MGL_NAMESPACE)
 201 #define NAME(func)  mgl##func
 202 #else
 203 #define NAME(func)  gl##func
 204 #endif
 205
 206 #define DISPATCH(FUNC, ARGS, MESSAGE)           \
 207    CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 208
 209 #define RETURN_DISPATCH(FUNC, ARGS, MESSAGE)    \
 210    return CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 211
 212 /* skip normal ones */
 213 #define _GLAPI_SKIP_NORMAL_ENTRY_POINTS
 214 #include "glapi/glapitemp.h"
 215
 216 #endif /* GLX_INDIRECT_RENDERING */