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_manager.h"
  40
  41 /* advertise OpenGL support */
  42 PUBLIC const int st_api_OpenGL = 1;
  43
  44 PUBLIC const struct st_module st_module_OpenGL = {
  45    .api = ST_API_OPENGL,
  46    .create_api = st_manager_create_api
  47 };
  48
  49 /* Helper function to choose and instantiate one of the software rasterizers:
  50  * cell, llvmpipe, softpipe.
  51  *
  52  * This function could be shared, but currently causes headaches for
  53  * the build systems, particularly scons if we try.  Long term, want
  54  * to avoid having global #defines for things like GALLIUM_LLVMPIPE,
  55  * GALLIUM_CELL, etc.  Scons already eliminates those #defines, so
  56  * things that are painful for it now are likely to be painful for
  57  * other build systems in the future.
  58  *
  59  * Copies (full or partial):
  60  *    targets/libgl-xlib
  61  *    targets/graw-xlib
  62  *    targets/dri-swrast
  63  *    winsys/sw/drm
  64  *    drivers/sw
  65  *
  66  */
  67
  68 #ifdef GALLIUM_SOFTPIPE
  69 #include "softpipe/sp_public.h"
  70 #endif
  71
  72 #ifdef GALLIUM_LLVMPIPE
  73 #include "llvmpipe/lp_public.h"
  74 #endif
  75
  76 #ifdef GALLIUM_CELL
  77 #include "cell/ppu/cell_public.h"
  78 #endif
  79
  80 static struct pipe_screen *
  81 swrast_create_screen(struct sw_winsys *winsys)
  82 {
  83    const char *default_driver;
  84    const char *driver;
  85    struct pipe_screen *screen = NULL;
  86
  87 #if defined(GALLIUM_CELL)
  88    default_driver = "cell";
  89 #elif defined(GALLIUM_LLVMPIPE)
  90    default_driver = "llvmpipe";
  91 #elif defined(GALLIUM_SOFTPIPE)
  92    default_driver = "softpipe";
  93 #else
  94    default_driver = "";
  95 #endif
  96
  97    driver = debug_get_option("GALLIUM_DRIVER", default_driver);
  98
  99 #if defined(GALLIUM_CELL)
 100    if (screen == NULL && strcmp(driver, "cell") == 0)
 101       screen = cell_create_screen( winsys );
 102 #endif
 103
 104 #if defined(GALLIUM_LLVMPIPE)
 105    if (screen == NULL && strcmp(driver, "llvmpipe") == 0)
 106       screen = llvmpipe_create_screen( winsys );
 107 #endif
 108
 109 #if defined(GALLIUM_SOFTPIPE)
 110    if (screen == NULL)
 111       screen = softpipe_create_screen( winsys );
 112 #endif
 113
 114    return screen;
 115 }
 116
 117 /* Helper function to build a subset of a driver stack consisting of
 118  * one of the software rasterizers (cell, llvmpipe, softpipe) and the
 119  * xlib winsys.
 120  */
 121 static struct pipe_screen *
 122 swrast_xlib_create_screen( Display *display )
 123 {
 124    struct sw_winsys *winsys;
 125    struct pipe_screen *screen = NULL;
 126
 127    /* Create the underlying winsys, which performs presents to Xlib
 128     * drawables:
 129     */
 130    winsys = xlib_create_sw_winsys( display );
 131    if (winsys == NULL)
 132       return NULL;
 133
 134    /* Create a software rasterizer on top of that winsys:
 135     */
 136    screen = swrast_create_screen( winsys );
 137    if (screen == NULL)
 138       goto fail;
 139
 140    /* Inject any wrapping layers we want to here:
 141     */
 142    return gallium_wrap_screen( screen );
 143
 144 fail:
 145    if (winsys)
 146       winsys->destroy( winsys );
 147
 148    return NULL;
 149 }
 150
 151 static struct xm_driver xlib_driver =
 152 {
 153    .create_pipe_screen = swrast_xlib_create_screen,
 154    .create_st_api = st_manager_create_api,
 155 };
 156
 157
 158 /* Build the rendering stack.
 159  */
 160 static void _init( void ) __attribute__((constructor));
 161 static void _init( void )
 162 {
 163    /* Initialize the xlib libgl code, pass in the winsys:
 164     */
 165    xmesa_set_driver( &xlib_driver );
 166 }
 167
 168
 169 /***********************************************************************
 170  *
 171  * Butt-ugly hack to convince the linker not to throw away public GL
 172  * symbols (they are all referenced from getprocaddress, I guess).
 173  */
 174 extern void (*linker_foo(const unsigned char *procName))();
 175 extern void (*glXGetProcAddress(const unsigned char *procName))();
 176
 177 extern void (*linker_foo(const unsigned char *procName))()
 178 {
 179    return glXGetProcAddress(procName);
 180 }
 181
 182
 183 /**
 184  * When GLX_INDIRECT_RENDERING is defined, some symbols are missing in
 185  * libglapi.a.  We need to define them here.
 186  */
 187 #ifdef GLX_INDIRECT_RENDERING
 188
 189 #define GL_GLEXT_PROTOTYPES
 190 #include "GL/gl.h"
 191 #include "glapi/glapi.h"
 192 #include "glapi/glapitable.h"
 193 #include "glapi/glapidispatch.h"
 194
 195 #if defined(USE_MGL_NAMESPACE)
 196 #define NAME(func)  mgl##func
 197 #else
 198 #define NAME(func)  gl##func
 199 #endif
 200
 201 #define DISPATCH(FUNC, ARGS, MESSAGE)           \
 202    CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 203
 204 #define RETURN_DISPATCH(FUNC, ARGS, MESSAGE)    \
 205    return CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 206
 207 /* skip normal ones */
 208 #define _GLAPI_SKIP_NORMAL_ENTRY_POINTS
 209 #include "glapi/glapitemp.h"
 210
 211 #endif /* GLX_INDIRECT_RENDERING */