src/gallium/state_trackers/egl/common/egl_st.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.8
   4  *
   5  * Copyright (C) 2009-2010 Chia-I Wu <olv@0xlab.org>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include <dlfcn.h>
  26 #include "pipe/p_compiler.h"
  27 #include "util/u_memory.h"
  28 #include "egllog.h"
  29 #include "EGL/egl.h" /* for EGL_api_BIT */
  30
  31 #include "egl_st.h"
  32
  33 #ifndef HAVE_DLADDR
  34 #define HAVE_DLADDR 1
  35 #endif
  36
  37 #if HAVE_DLADDR
  38
  39 static const char *
  40 egl_g3d_st_names[] = {
  41 #define ST_PUBLIC(name, ...) #name,
  42 #include "st_public_tmp.h"
  43    NULL
  44 };
  45
  46 static boolean
  47 egl_g3d_fill_st(struct egl_g3d_st *stapi, void *sym)
  48 {
  49    st_proc *procs = (st_proc *) stapi;
  50    void *handle;
  51    Dl_info info;
  52    const char **name;
  53
  54    if (!dladdr(sym, &info))
  55       return FALSE;
  56    handle = dlopen(info.dli_fname, RTLD_LAZY | RTLD_LOCAL | RTLD_NODELETE);
  57    if (!handle)
  58       return FALSE;
  59
  60    for (name = egl_g3d_st_names; *name; name++) {
  61       st_proc proc = (st_proc) dlsym(handle, *name);
  62       if (!proc) {
  63          _eglLog(_EGL_WARNING, "%s is missing in %s", *name, info.dli_fname);
  64          memset(stapi, 0, sizeof(*stapi));
  65          dlclose(handle);
  66          return FALSE;
  67       }
  68       *procs++ = proc;
  69    }
  70
  71    dlclose(handle);
  72    return TRUE;
  73 }
  74
  75 #else /* HAVE_DLADDR */
  76
  77 static boolean
  78 egl_g3d_fill_st(struct egl_g3d_st *stapi, void *sym)
  79 {
  80 #define ST_PUBLIC(name, ...) stapi->name = name;
  81 #include "st_public_tmp.h"
  82    return TRUE;
  83 }
  84
  85 #endif /* HAVE_DLADDR */
  86
  87 static boolean
  88 egl_g3d_init_st(struct egl_g3d_st *stapi, const char *api)
  89 {
  90    void *handle, *sym;
  91    boolean res = FALSE;
  92
  93    /* already initialized */
  94    if (stapi->st_notify_swapbuffers != NULL)
  95       return TRUE;
  96
  97    handle = dlopen(NULL, RTLD_LAZY | RTLD_LOCAL);
  98    if (!handle)
  99       return FALSE;
 100
 101    sym = dlsym(handle, api);
 102    if (sym && egl_g3d_fill_st(stapi, sym))
 103       res = TRUE;
 104
 105    dlclose(handle);
 106    return res;
 107 }
 108
 109 static struct {
 110    const char *symbol;
 111    EGLint api_bit;
 112 } egl_g3d_st_info[NUM_EGL_G3D_STS] = {
 113    { "st_api_OpenGL_ES1",  EGL_OPENGL_ES_BIT },
 114    { "st_api_OpenVG",      EGL_OPENVG_BIT },
 115    { "st_api_OpenGL_ES2",  EGL_OPENGL_ES2_BIT },
 116    { "st_api_OpenGL",      EGL_OPENGL_BIT },
 117 };
 118
 119 const struct egl_g3d_st *
 120 egl_g3d_get_st(enum egl_g3d_st_api api)
 121 {
 122    static struct egl_g3d_st all_trackers[NUM_EGL_G3D_STS];
 123
 124    if (egl_g3d_init_st(&all_trackers[api], egl_g3d_st_info[api].symbol)) {
 125       all_trackers[api].api_bit = egl_g3d_st_info[api].api_bit;
 126       return &all_trackers[api];
 127    }
 128    else {
 129       return NULL;
 130    }
 131 }