From 439b197dbef6b3643ffb7da766e261a04ffaf354 Mon Sep 17 00:00:00 2001
From: Jesse Hall <jessehall@google.com>
Date: Thu, 4 Jul 2013 12:08:16 -0700
Subject: [PATCH] Find non-extension GLES wrappers in eglGetProcAddress

This allows apps to find OpenGL ES 3.0 functions using
eglGetProcAddress() instead of dlopen/dlsym.

Bug: 9681677
Change-Id: I7ce6e1636bc47d6b0bf20a4e46bd67235714d129
---
 opengl/libs/EGL/Loader.cpp | 13 ++++++++++++-
 opengl/libs/EGL/eglApi.cpp | 17 +++++++++++++++++
 opengl/libs/EGL/egldefs.h  |  3 +++
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/opengl/libs/EGL/Loader.cpp b/opengl/libs/EGL/Loader.cpp
index 00bfa5a3b..56550b3fa 100644
--- a/opengl/libs/EGL/Loader.cpp
+++ b/opengl/libs/EGL/Loader.cpp
@@ -175,6 +175,12 @@ Loader::~Loader()
     GLTrace_stop();
 }
 
+static void* load_wrapper(const char* path) {
+    void* so = dlopen(path, RTLD_NOW | RTLD_LOCAL);
+    ALOGE_IF(!so, "dlopen(\"%s\") failed: %s", path, dlerror());
+    return so;
+}
+
 void* Loader::open(egl_connection_t* cnx)
 {
     void* dso;
@@ -200,7 +206,12 @@ void* Loader::open(egl_connection_t* cnx)
     LOG_FATAL_IF(!index && !hnd,
             "couldn't find the default OpenGL ES implementation "
             "for default display");
-    
+
+    cnx->libGles2 = load_wrapper("system/lib/libGLESv2.so");
+    cnx->libGles1 = load_wrapper("system/lib/libGLESv1_CM.so");
+    LOG_ALWAYS_FATAL_IF(!cnx->libGles2 || !cnx->libGles1,
+            "couldn't load system OpenGL ES wrapper libraries");
+
     return (void*)hnd;
 }
 
diff --git a/opengl/libs/EGL/eglApi.cpp b/opengl/libs/EGL/eglApi.cpp
index 74d397335..a243b3267 100644
--- a/opengl/libs/EGL/eglApi.cpp
+++ b/opengl/libs/EGL/eglApi.cpp
@@ -16,6 +16,7 @@
 
 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
 
+#include <dlfcn.h>
 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
@@ -772,6 +773,20 @@ EGLint eglGetError(void)
     return err;
 }
 
+static __eglMustCastToProperFunctionPointerType findBuiltinGLWrapper(
+        const char* procname) {
+    const egl_connection_t* cnx = &gEGLImpl;
+    void* proc = NULL;
+
+    proc = dlsym(cnx->libGles2, procname);
+    if (proc) return (__eglMustCastToProperFunctionPointerType)proc;
+
+    proc = dlsym(cnx->libGles1, procname);
+    if (proc) return (__eglMustCastToProperFunctionPointerType)proc;
+
+    return NULL;
+}
+
 __eglMustCastToProperFunctionPointerType eglGetProcAddress(const char *procname)
 {
     // eglGetProcAddress() could be the very first function called
@@ -793,6 +808,8 @@ __eglMustCastToProperFunctionPointerType eglGetProcAddress(const char *procname)
     addr = findProcAddress(procname, sExtensionMap, NELEM(sExtensionMap));
     if (addr) return addr;
 
+    addr = findBuiltinGLWrapper(procname);
+    if (addr) return addr;
 
     // this protects accesses to sGLExtentionMap and sGLExtentionSlot
     pthread_mutex_lock(&sExtensionMapMutex);
diff --git a/opengl/libs/EGL/egldefs.h b/opengl/libs/EGL/egldefs.h
index 1cfe56147..b905ea079 100644
--- a/opengl/libs/EGL/egldefs.h
+++ b/opengl/libs/EGL/egldefs.h
@@ -43,6 +43,9 @@ struct egl_connection_t {
     EGLint              major;
     EGLint              minor;
     egl_t               egl;
+
+    void*               libGles1;
+    void*               libGles2;
 };
 
 // ----------------------------------------------------------------------------