Added stencil-test demo....

gpu/demos/stencil_test/main.cc

+// Copyright (c) 2010 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 example shows various stencil buffer operations.
+
+#include "gpu/demos/app_framework/application.h"
+#include "third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.h"
+
+namespace gpu_demos {
+class StencilTest : public Application {
+ public:
+  StencilTest();
+  ~StencilTest();
+
+  bool Init();
+
+ protected:
+  virtual void Draw(float elapsed_sec);
+
+ private:
+  ESContext context_;
+  STUserData user_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(StencilTest);
+};
+
+StencilTest::StencilTest() {
+  esInitContext(&context_);
+
+  memset(&user_data_, 0, sizeof(STUserData));
+  context_.userData = &user_data_;
+}
+
+StencilTest::~StencilTest() {
+  stShutDown(&context_);
+}
+
+bool StencilTest::Init() {
+  if (!Application::InitRenderContext()) return false;
+
+  context_.width = width();
+  context_.height = height();
+  if (!stInit(&context_)) return false;
+
+  return true;
+}
+
+void StencilTest::Draw(float /*elapsed_sec*/) {
+  stDraw(&context_);
+}
+}  // namespace gpu_demos
+
+int main(int argc, char *argv[]) {
+  gpu_demos::StencilTest app;
+  if (!app.Init()) {
+    printf("Could not init.\n");
+    return EXIT_FAILURE;
+  }
+
+  app.MainLoop();
+  return EXIT_SUCCESS;
+}