emulator: opengl: Back-port GLES emulation from the master tree.

The modules here are only built when BUILD_EMULATOR_OPENGL is defined to true
in your environment or your BoardConfig.mk (see tools/emulator/opengl/Android.mk)

Change-Id: I5f32c35b4452fb5a7b4d5f9fc5870ec1da6032e6

tools/emulator/opengl/system/OpenglSystemCommon/ThreadInfo.h

@@ -0,0 +1,59 @@
+/*
+* Copyright (C) 2011 The Android Open Source Project
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+#ifndef _THREAD_INFO_H
+#define _THREAD_INFO_H
+
+#include "HostConnection.h"
+#include <pthread.h>
+#ifdef HAVE_ANDROID_OS
+#include <bionic_tls.h>
+#endif
+
+struct EGLContext_t;
+
+struct EGLThreadInfo
+{
+    EGLThreadInfo() : currentContext(NULL), hostConn(NULL), eglError(EGL_SUCCESS) {}
+
+    EGLContext_t *currentContext;
+    HostConnection *hostConn;
+    int           eglError;
+};
+
+
+EGLThreadInfo *slow_getEGLThreadInfo();
+
+#ifdef HAVE_ANDROID_OS
+    // We have a dedicated TLS slot in bionic
+    inline EGLThreadInfo* getEGLThreadInfo() {
+        EGLThreadInfo *tInfo =
+             (EGLThreadInfo *)(((unsigned *)__get_tls())[TLS_SLOT_OPENGL]);
+        if (!tInfo) {
+            tInfo = slow_getEGLThreadInfo();
+            ((uint32_t *)__get_tls())[TLS_SLOT_OPENGL] = (uint32_t)tInfo;
+        }
+        return tInfo;
+    }
+#else
+    inline EGLThreadInfo* getEGLThreadInfo() {
+        return slow_getEGLThreadInfo();
+    }
+#endif
+
+
+
+
+#endif // of _THREAD_INFO_H