/*
* Handle to the true OpenGL library.
+ * XXX: Not really used yet.
*/
#if defined(_WIN32)
HINSTANCE __libGlHandle = NULL;
#else
-void *__libGlHandle = RTLD_NEXT;
+void *__libGlHandle = NULL;
#endif
#else
/*
- * Lookup a EGL or GLES symbol
+ * Lookup a public EGL/GL/GLES symbol
+ *
+ * The spec states that eglGetProcAddress should only be used for non-core
+ * (extensions) entry-points. Core entry-points should be taken directly from
+ * the API specific libraries.
+ *
+ * We cannot tell here which API a symbol is meant for here (as some are
+ * exported by many). So this code assumes that the appropriate shared
+ * libraries have been loaded previously (either dlopened with RTLD_GLOBAL, or
+ * as part of the executable dependencies), and that their symbols available
+ * for quering via dlsym(RTLD_NEXT, ...).
*/
-static inline void *
-__libegl_sym(const char *symbol)
-{
- void *proc;
-
- /* Always try dlsym before eglGetProcAddress as spec 3.10 says
- * implementation may choose to also export extension functions
- * publicly.
- */
- proc = dlsym(__libGlHandle, symbol);
- if (!proc && symbol[0] == 'g' && symbol[1] == 'l')
- proc = (void *) __eglGetProcAddress(symbol);
-
- return proc;
-}
-
void *
__getPublicProcAddress(const char *procName)
{
- return __libegl_sym(procName);
+#if defined(ANDROID)
+ /*
+ * Android does not support LD_PRELOAD. It is assumed that applications
+ * are explicitely loading egltrace.so.
+ */
+
+ if (procName[0] == 'e' && procName[1] == 'g' && procName[2] == 'l') {
+ static void *libEGL = NULL;
+ if (!libEGL) {
+ libEGL = dlopen("libEGL.so", RTLD_LOCAL | RTLD_LAZY);
+ if (!libEGL) {
+ return NULL;
+ }
+ }
+ return dlsym(libEGL, procName);
+ }
+
+ if (procName[0] == 'g' && procName[1] == 'l') {
+ /* TODO: Use GLESv1/GLESv2 on a per-context basis. */
+ static void *sym = NULL;
+
+ static void *libGLESv2 = NULL;
+ if (!libGLESv2) {
+ libGLESv2 = dlopen("libGLESv2.so", RTLD_LOCAL | RTLD_LAZY);
+ }
+ if (libGLESv2) {
+ sym = dlsym(libGLESv2, procName);
+ }
+ if (sym) {
+ return sym;
+ }
+
+ static void *libGLESv1 = NULL;
+ if (!libGLESv1) {
+ libGLESv1 = dlopen("libGLESv1_CM.so", RTLD_LOCAL | RTLD_LAZY);
+ }
+ if (libGLESv1) {
+ sym = dlsym(libGLESv1, procName);
+ }
+ if (sym) {
+ return sym;
+ }
+ }
+
+ return NULL;
+#else
+ return dlsym(RTLD_NEXT, procName);
+#endif
}
+/*
+ * Lookup a private EGL/GL/GLES symbol
+ *
+ * Private symbols should always be available through eglGetProcAddress, and
+ * they are guaranteed to work with any context bound (regardless of the API).
+ *
+ * However, per issue#57, eglGetProcAddress returns garbage on some
+ * implementations, and the spec states that implementations may choose to also
+ * export extension functions publicly, so we always attempt dlsym before
+ * eglGetProcAddress to mitigate that.
+ */
void *
__getPrivateProcAddress(const char *procName)
{
- return __libegl_sym(procName);
+ void *proc;
+ proc = __getPublicProcAddress(procName);
+ if (!proc &&
+ ((procName[0] == 'e' && procName[1] == 'g' && procName[2] == 'l') ||
+ (procName[0] == 'g' && procName[1] == 'l'))) {
+ proc = (void *) __eglGetProcAddress(procName);
+ }
+
+ return proc;
}
#endif