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 /* piggy back on this libGL for OpenGL support in EGL */
  43 struct st_api *
  44 st_api_create_OpenGL()
  45 {
  46    return st_gl_api_create();
  47 }
  48
  49
  50 /* Helper function to choose and instantiate one of the software rasterizers:
  51  * cell, llvmpipe, softpipe.
  52  *
  53  * This function could be shared, but currently causes headaches for
  54  * the build systems, particularly scons if we try.  Long term, want
  55  * to avoid having global #defines for things like GALLIUM_LLVMPIPE,
  56  * GALLIUM_CELL, etc.  Scons already eliminates those #defines, so
  57  * things that are painful for it now are likely to be painful for
  58  * other build systems in the future.
  59  *
  60  * Copies (full or partial):
  61  *    targets/libgl-xlib
  62  *    targets/graw-xlib
  63  *    targets/dri-swrast
  64  *    winsys/sw/drm
  65  *    drivers/sw
  66  *
  67  */
  68
  69 #ifdef GALLIUM_SOFTPIPE
  70 #include "softpipe/sp_public.h"
  71 #endif
  72
  73 #ifdef GALLIUM_LLVMPIPE
  74 #include "llvmpipe/lp_public.h"
  75 #endif
  76
  77 #ifdef GALLIUM_CELL
  78 #include "cell/ppu/cell_public.h"
  79 #endif
  80
  81 #ifdef GALLIUM_GALAHAD
  82 #include "galahad/glhd_public.h"
  83 #endif
  84
  85 static struct pipe_screen *
  86 swrast_create_screen(struct sw_winsys *winsys)
  87 {
  88    const char *default_driver;
  89    const char *driver;
  90    struct pipe_screen *screen = NULL;
  91
  92 #if defined(GALLIUM_CELL)
  93    default_driver = "cell";
  94 #elif defined(GALLIUM_LLVMPIPE)
  95    default_driver = "llvmpipe";
  96 #elif defined(GALLIUM_SOFTPIPE)
  97    default_driver = "softpipe";
  98 #else
  99    default_driver = "";
 100 #endif
 101
 102    driver = debug_get_option("GALLIUM_DRIVER", default_driver);
 103
 104 #if defined(GALLIUM_CELL)
 105    if (screen == NULL && strcmp(driver, "cell") == 0)
 106       screen = cell_create_screen( winsys );
 107 #endif
 108
 109 #if defined(GALLIUM_LLVMPIPE)
 110    if (screen == NULL && strcmp(driver, "llvmpipe") == 0)
 111       screen = llvmpipe_create_screen( winsys );
 112 #endif
 113
 114 #if defined(GALLIUM_SOFTPIPE)
 115    if (screen == NULL)
 116       screen = softpipe_create_screen( winsys );
 117 #endif
 118
 119 #if defined(GALLIUM_GALAHAD)
 120    if (screen) {
 121       struct pipe_screen *galahad_screen = galahad_screen_create(screen);
 122       if (galahad_screen)
 123          screen = galahad_screen;
 124    }
 125 #endif
 126
 127    return screen;
 128 }
 129
 130 /* Helper function to build a subset of a driver stack consisting of
 131  * one of the software rasterizers (cell, llvmpipe, softpipe) and the
 132  * xlib winsys.
 133  */
 134 static struct pipe_screen *
 135 swrast_xlib_create_screen( Display *display )
 136 {
 137    struct sw_winsys *winsys;
 138    struct pipe_screen *screen = NULL;
 139
 140    /* Create the underlying winsys, which performs presents to Xlib
 141     * drawables:
 142     */
 143    winsys = xlib_create_sw_winsys( display );
 144    if (winsys == NULL)
 145       return NULL;
 146
 147    /* Create a software rasterizer on top of that winsys:
 148     */
 149    screen = swrast_create_screen( winsys );
 150    if (screen == NULL)
 151       goto fail;
 152
 153    /* Inject any wrapping layers we want to here:
 154     */
 155    return gallium_wrap_screen( screen );
 156
 157 fail:
 158    if (winsys)
 159       winsys->destroy( winsys );
 160
 161    return NULL;
 162 }
 163
 164 static struct xm_driver xlib_driver =
 165 {
 166    .create_pipe_screen = swrast_xlib_create_screen,
 167    .create_st_api = st_gl_api_create,
 168 };
 169
 170
 171 /* Build the rendering stack.
 172  */
 173 static void _init( void ) __attribute__((constructor));
 174 static void _init( void )
 175 {
 176    /* Initialize the xlib libgl code, pass in the winsys:
 177     */
 178    xmesa_set_driver( &xlib_driver );
 179 }
 180
 181
 182 /***********************************************************************
 183  *
 184  * Butt-ugly hack to convince the linker not to throw away public GL
 185  * symbols (they are all referenced from getprocaddress, I guess).
 186  */
 187 extern void (*linker_foo(const unsigned char *procName))();
 188 extern void (*glXGetProcAddress(const unsigned char *procName))();
 189
 190 extern void (*linker_foo(const unsigned char *procName))()
 191 {
 192    return glXGetProcAddress(procName);
 193 }
 194
 195
 196 /**
 197  * When GLX_INDIRECT_RENDERING is defined, some symbols are missing in
 198  * libglapi.a.  We need to define them here.
 199  */
 200 #ifdef GLX_INDIRECT_RENDERING
 201
 202 #define GL_GLEXT_PROTOTYPES
 203 #include "GL/gl.h"
 204 #include "glapi/glapi.h"
 205 #include "glapi/glapitable.h"
 206 #include "glapi/glapidispatch.h"
 207
 208 #if defined(USE_MGL_NAMESPACE)
 209 #define NAME(func)  mgl##func
 210 #else
 211 #define NAME(func)  gl##func
 212 #endif
 213
 214 #define DISPATCH(FUNC, ARGS, MESSAGE)           \
 215    CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 216
 217 #define RETURN_DISPATCH(FUNC, ARGS, MESSAGE)    \
 218    return CALL_ ## FUNC(GET_DISPATCH(), ARGS);
 219
 220 /* skip normal ones */
 221 #define _GLAPI_SKIP_NORMAL_ENTRY_POINTS
 222 #include "glapi/glapitemp.h"
 223
 224 #endif /* GLX_INDIRECT_RENDERING */