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 || strlen (libgl_path) == 0) {
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);
141 (*glXGetProcAddress (const unsigned char *name))(void);
144 (*glXGetProcAddress (const unsigned char *name))(void)
146 static int first_call = 1;
147 static typeof (&glXGetProcAddress) wrapper_glXGetProcAddress;
148 static typeof (&glXGetProcAddress) libgl_glXGetProcAddress;
151 /* On the first call, check if the wrapper provides an
152 * implementation of this function. */
154 wrapper_glXGetProcAddress = dlsym (wrapper_handle,
155 "glXGetProcAddress");
156 libgl_glXGetProcAddress = dlsym (libgl_handle,
157 "glXGetProcAddress");
161 /* If the wrapper implements glXGetProcAddress itself, then it
162 * had better know best what to do. Just let it. */
163 if (wrapper_glXGetProcAddress)
164 return wrapper_glXGetProcAddress (name);
166 /* Otherwise, we need to resolve the name.
168 * The wrapper gets first choice on all symbols. */
169 symbol = dlsym (wrapper_handle, (char *) name);
173 /* The wrapper doesn't care, so defer to the underlying
174 * glXGetProcAddress */
175 return libgl_glXGetProcAddress (name);
180 (*glXGetProcAddressARB (const unsigned char *name))(void);
183 (*glXGetProcAddressARB (const unsigned char *name))(void)
185 static int first_call = 1;
186 static typeof (&glXGetProcAddressARB) wrapper_glXGetProcAddressARB;
187 static typeof (&glXGetProcAddressARB) libgl_glXGetProcAddressARB;
190 /* On the first call, check if the wrapper provides an
191 * implementation of this function. */
193 wrapper_glXGetProcAddressARB = dlsym (wrapper_handle,
194 "glXGetProcAddressARB");
195 libgl_glXGetProcAddressARB = dlsym (libgl_handle,
196 "glXGetProcAddressARB");
200 /* If the wrapper implements glXGetProcAddressARB itself, then
201 * it had better know best what to do. Just let it. */
202 if (wrapper_glXGetProcAddressARB)
203 return wrapper_glXGetProcAddressARB (name);
205 /* Otherwise, we need to resolve the name.
207 * The wrapper gets first choice on all symbols. */
208 symbol = dlsym (wrapper_handle, (char *) name);
212 /* The wrapper doesn't care, so defer to the underlying
213 * glXGetProcAddressARB */
214 return libgl_glXGetProcAddressARB (name);
218 #define GLAZE_API(name) \
219 void * name() __attribute__((ifunc(#name "_resolver"))); \
221 name ## _resolver (void) { return resolve (#name); }
223 #include "specs/gl.def"
224 #include "specs/glx.def"