Added an application framework for demos. Ported hello-triangle example in Op...

third_party/gles_book_examples/Chapter_2/Hello_Triangle/Hello_Triangle.h

+//
+// Book:      OpenGL(R) ES 2.0 Programming Guide
+// Authors:   Aaftab Munshi, Dan Ginsburg, Dave Shreiner
+// ISBN-10:   0321502795
+// ISBN-13:   9780321502797
+// Publisher: Addison-Wesley Professional
+// URLs:      http://safari.informit.com/9780321563835
+//            http://www.opengles-book.com
+//
+
+//
+// Hello_Triangle.h
+//
+//    This is a simple example that draws a single triangle with
+//    a minimal vertex/fragment shader.  The purpose of this 
+//    example is to demonstrate the basic concepts of 
+//    OpenGL ES 2.0 rendering.
+
+#ifndef HELLO_TRIANGLE_H
+#define HELLO_TRIANGLE_H
+
+#include "esUtil.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+typedef struct
+{
+   // Handle to a program object
+   GLuint programObject;
+   // Handle to vbo object
+   GLuint vbo;
+
+} HTUserData;
+
+extern int htInit ( ESContext *esContext );
+
+extern void htDraw ( ESContext *esContext );
+
+extern void htShutDown ( ESContext *esContext );
+
+#ifdef __cplusplus
+}
+#endif  // __cplusplus
+#endif  // HELLO_TRIANGLE_H