1 /* Copyright © 2013, Intel Corporation
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
34 #define STRNCMP_LITERAL(str, literal) strncmp (str, literal, sizeof (literal) - 1)
37 open_libgl_handle (void)
39 const char *libgl_path;
44 libgl_path = getenv ("GLAZE_LIBGL");
46 if (libgl_path == NULL) {
49 libgl_path = getenv ("GLAZE_LIBGL_32_AUTO");
50 #elif GLAZE_BITS == 64
51 libgl_path = getenv ("GLAZE_LIBGL_64_AUTO");
54 if (libgl_path == NULL) {
56 "Error: Failed to detect OpenGL library.\n"
57 "Please set GLAZE_LIBGL to path of real libGL.so\n");
61 setenv ("GLAZE_LIBGL", libgl_path, 1);
65 libgl_handle = dlopen (libgl_path, RTLD_LAZY | RTLD_GLOBAL);
66 if (libgl_handle == NULL) {
67 fprintf (stderr, "glaze_init: Error: Failed to dlopen %s: %s\n",
68 libgl_path, dlerror());
74 open_wrapper_handle (void)
81 path = getenv ("GLAZE_WRAPPER");
83 fprintf (stderr, "GLAZE_WRAPPER unset. Please set to path of Glaze-using wrapper library.\n");
88 wrapper_handle = dlopen (path, RTLD_LAZY);
89 if (wrapper_handle == NULL) {
90 const char *error = dlerror();
91 fprintf (stderr, "Error: Failed to dlopen %s: %s\n", path, error);
97 glaze_init (void) __attribute__((constructor));
102 open_libgl_handle ();
103 open_wrapper_handle ();
107 resolve (const char *name)
109 static int before_first_gl_call = 1;
112 if (before_first_gl_call &&
113 STRNCMP_LITERAL (name, "gl") == 0 &&
114 STRNCMP_LITERAL (name, "glX") != 0)
116 char *callback_name = getenv ("GLAZE_FIRST_GL_CALL_CALLBACK");
118 void (*callback) (void) = dlsym (wrapper_handle,
124 "Error: Failed to find function %s "
125 "in GLAZE_WRAPPER library.\n",
129 before_first_gl_call = 0;
132 /* The wrapper gets first choice on all symbols. */
133 symbol = dlsym (wrapper_handle, name);
137 return dlsym (libgl_handle, name);
140 #define GLAZE_API(name) \
141 void * name() __attribute__((ifunc(#name "_resolver"))); \
143 name ## _resolver (void) { return resolve (#name); }
145 #include "specs/gl.def"
146 #include "specs/glx.def"