Emulator Opengl - adding preliminary version of GLESv2 encoder

This preliminary version includes the API definition, and the
GL2Encoder implementation class

Change-Id: I7ef9cfeb98c1e85097287ab26733825087368ee0

tools/emulator/opengl/system/GLESv2_enc/GL2EncoderUtils.cpp

@@ -0,0 +1,32 @@
+/*
+* 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 <stdio.h>
+#include <stdlib.h>
+#include "GL2Encoder.h"
+#include <assert.h>
+
+size_t pixelDataSize(void *self, GLsizei width, GLsizei height, GLenum format, GLenum type, int pack)
+{
+    GL2Encoder *ctx = (GL2Encoder *)self;
+    assert (ctx->state() != NULL);
+    return ctx->state()->pixelDataSize(width, height, format, type, pack);
+}
+
+size_t pixelDataSize3D(void *self, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, int pack)
+{
+    size_t layerSize = pixelDataSize(self, width, height, format, type, pack);
+    return layerSize * depth;
+}