Move dispatch to its own subdirectory.

[apitrace] / dispatch / glproc_egl.cpp

diff --git a/dispatch/glproc_egl.cpp b/dispatch/glproc_egl.cpp
new file mode 100644 (file)
index 0000000..8a0fb34
--- /dev/null
+++ b/dispatch/glproc_egl.cpp
@@ -0,0 +1,151 @@
+/**************************************************************************
+ *
+ * Copyright 2011 Jose Fonseca
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include "glproc.hpp"
+
+
+#if !defined(_WIN32)
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE // for dladdr
+#endif
+#include <dlfcn.h>
+#endif
+
+
+/*
+ * Handle to the true OpenGL library.
+ * XXX: Not really used yet.
+ */
+#if defined(_WIN32)
+HINSTANCE __libGlHandle = NULL;
+#else
+void *__libGlHandle = NULL;
+#endif
+
+
+
+#if defined(_WIN32)
+
+#error Unsupported
+
+#elif defined(__APPLE__)
+
+#error Unsupported
+
+#else
+
+/*
+ * 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, ...).
+ */
+void *
+__getPublicProcAddress(const char *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)
+{
+    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