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      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 "state_tracker/xlib_sw_winsys.h"
     36 #include "xm_public.h"
     37 
     38 #include "state_tracker/st_gl_api.h"
     39 #include "target-helpers/inline_sw_helper.h"
     40 #include "target-helpers/inline_debug_helper.h"
     41 
     42 
     43 
     44 /* Helper function to build a subset of a driver stack consisting of
     45  * one of the software rasterizers (llvmpipe, softpipe) and the
     46  * xlib winsys.
     47  */
     48 static struct pipe_screen *
     49 swrast_xlib_create_screen( Display *display )
     50 {
     51    struct sw_winsys *winsys;
     52    struct pipe_screen *screen = NULL;
     53 
     54    /* Create the underlying winsys, which performs presents to Xlib
     55     * drawables:
     56     */
     57    winsys = xlib_create_sw_winsys( display );
     58    if (winsys == NULL)
     59       return NULL;
     60 
     61    /* Create a software rasterizer on top of that winsys:
     62     */
     63    screen = sw_screen_create( winsys );
     64    if (screen == NULL)
     65       goto fail;
     66 
     67    /* Inject any wrapping layers we want to here:
     68     */
     69    return debug_screen_wrap( screen );
     70 
     71 fail:
     72    if (winsys)
     73       winsys->destroy( winsys );
     74 
     75    return NULL;
     76 }
     77 
     78 static struct xm_driver xlib_driver =
     79 {
     80    .create_pipe_screen = swrast_xlib_create_screen,
     81    .create_st_api = st_gl_api_create,
     82 };
     83 
     84 
     85 /* Build the rendering stack.
     86  */
     87 static void _init( void ) __attribute__((constructor));
     88 static void _init( void )
     89 {
     90    /* Initialize the xlib libgl code, pass in the winsys:
     91     */
     92    xmesa_set_driver( &xlib_driver );
     93 }
     94 
     95 
     96 /***********************************************************************
     97  *
     98  * Butt-ugly hack to convince the linker not to throw away public GL
     99  * symbols (they are all referenced from getprocaddress, I guess).
    100  */
    101 extern void (*linker_foo(const unsigned char *procName))();
    102 extern void (*glXGetProcAddress(const unsigned char *procName))();
    103 
    104 extern void (*linker_foo(const unsigned char *procName))()
    105 {
    106    return glXGetProcAddress(procName);
    107 }
    108 
    109 
    110 /**
    111  * When GLX_INDIRECT_RENDERING is defined, some symbols are missing in
    112  * libglapi.a.  We need to define them here.
    113  */
    114 #ifdef GLX_INDIRECT_RENDERING
    115 
    116 #define GL_GLEXT_PROTOTYPES
    117 #include "GL/gl.h"
    118 #include "glapi/glapi.h"
    119 #include "glapi/glapitable.h"
    120 
    121 #if defined(USE_MGL_NAMESPACE)
    122 #define NAME(func)  mgl##func
    123 #else
    124 #define NAME(func)  gl##func
    125 #endif
    126 
    127 #define DISPATCH(FUNC, ARGS, MESSAGE)		\
    128    GET_DISPATCH()->FUNC ARGS
    129 
    130 #define RETURN_DISPATCH(FUNC, ARGS, MESSAGE) 	\
    131    return GET_DISPATCH()->FUNC ARGS
    132 
    133 /* skip normal ones */
    134 #define _GLAPI_SKIP_NORMAL_ENTRY_POINTS
    135 #include "glapi/glapitemp.h"
    136 
    137 #endif /* GLX_INDIRECT_RENDERING */
    138