Android emulator opengl - unit test host side renderer

This adds 'ut_renderer' - a host side unit test renderer. ut_renderer is used to
take a command stream over a socket connection and render it into an opengl window.
The renderer uses the GLESv1_dec decoder library and the ut_rendercontrol api to parse
the command stream.
The ut_renderer uses an external (plug-in) opengl impelementation.

Change-Id: I77794044ca9ca8a75a66a95a248eac384710aafe

tools/emulator/opengl/tests/ut_renderer/ReadBuffer.cpp

@@ -0,0 +1,53 @@
+/*
+* 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.
+*/
+#include "ReadBuffer.h"
+#include <string.h>
+#include <assert.h>
+
+ReadBuffer::ReadBuffer(TcpStream *stream, size_t bufsize)
+{
+    m_size = bufsize;
+    m_stream = stream;
+    m_buf = new unsigned char[m_size];
+    m_validData = 0;
+    m_readPtr = m_buf;
+}
+
+ReadBuffer::~ReadBuffer()
+{
+    delete m_buf;
+}
+
+int ReadBuffer::getData()
+{
+    if (m_validData > 0) {
+        memcpy(m_buf, m_readPtr, m_validData);
+    }
+    m_readPtr = m_buf;
+    // get fresh data into the buffer;
+    int stat = m_stream->recv(m_buf + m_validData, m_size - m_validData);
+    if (stat > 0) {
+        m_validData += (size_t) stat;
+    }
+    return stat;
+}
+
+void ReadBuffer::consume(size_t amount)
+{
+    assert(amount <= m_validData);
+    m_validData -= amount;
+    m_readPtr += amount;
+}