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/shared/OpenglCodecCommon/FixedBuffer.h

@@ -0,0 +1,50 @@
+/*
+* 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 _FIXED_BUFFER_H
+#define _FIXED_BUFFER_H
+
+class FixedBuffer {
+public:
+    FixedBuffer(size_t initialSize = 0) {
+        m_buffer = NULL;
+        m_bufferLen = 0;
+        alloc(m_bufferLen);
+    }
+
+    ~FixedBuffer() {
+        delete m_buffer;
+        m_bufferLen = 0;
+    }
+
+    void * alloc(size_t size) {
+        if (m_bufferLen >= size) return (void *)(m_buffer);
+
+        if (m_buffer != NULL) delete[] m_buffer;
+
+        m_bufferLen = size;
+        m_buffer = new unsigned char[m_bufferLen];
+        if (m_buffer == NULL) m_bufferLen = 0;
+
+        return m_buffer;
+    }
+    void *ptr() { return m_buffer; }
+    size_t len() { return m_bufferLen; }
+private:
+    unsigned char *m_buffer;
+    size_t m_bufferLen;
+};
+
+#endif