Created a base class for examples taken from gles2 book. It encapsulates the ...

gpu/demos/hello_triangle/main.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // 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.
 
-#include "gpu/demos/app_framework/application.h"
+#include "gpu/demos/gles2_book/example.h"
 #include "third_party/gles2_book/Chapter_2/Hello_Triangle/Hello_Triangle.h"
 
-namespace gpu_demos {
-class HelloTriangle : public Application {
- public:
-  HelloTriangle();
-  ~HelloTriangle();
-
-  bool Init();
-
- protected:
-  virtual void Draw(float elapsed_sec);
-
- private:
-  ESContext context_;
-  HTUserData user_data_;
-
-  DISALLOW_COPY_AND_ASSIGN(HelloTriangle);
-};
-
-HelloTriangle::HelloTriangle() {
-  esInitContext(&context_);
-
-  memset(&user_data_, 0, sizeof(HTUserData));
-  context_.userData = &user_data_;
-}
-
-HelloTriangle::~HelloTriangle() {
-  htShutDown(&context_);
-}
-
-bool HelloTriangle::Init() {
-  if (!Application::InitRenderContext()) return false;
-
-  context_.width = width();
-  context_.height = height();
-  if (!htInit(&context_)) return false;
-
-  return true;
-}
-
-void HelloTriangle::Draw(float /*elapsed_sec*/) {
-  htDraw(&context_);
-}
-}  // namespace gpu_demos
+namespace gpu {
+namespace demos {
+namespace gles2_book {
+typedef Example<HTUserData,
+                htInit,
+                NoOpUpdateFunc,
+                htDraw,
+                htShutDown> HelloTriangle;
+}  // namespace gles2_book
+}  // namespace demos
+}  // namespace gpu
 
 int main(int argc, char *argv[]) {
-  gpu_demos::HelloTriangle app;
-  if (!app.Init()) {
-    printf("Could not init.\n");
-    return EXIT_FAILURE;
-  }
+  gpu::demos::gles2_book::HelloTriangle app;
+  CHECK(app.Init());
 
   app.MainLoop();
   return EXIT_SUCCESS;
 }