Changed the signature of Application::Draw to accept elapsed time. It will be...

gpu/demos/simple_vertex_shader/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 "third_party/gles2_book/Chapter_8/Simple_VertexShader/Simple_VertexShader.h"
 
 namespace gpu_demos {
 class SimpleVertexShader : public Application {
  public:
   SimpleVertexShader();
   ~SimpleVertexShader();
 
   bool Init();
 
  protected:
-  virtual void Draw();
+  virtual void Draw(float elapsed_sec);
 
  private:
   ESContext context_;
   SVSUserData user_data_;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleVertexShader);
 };
 
 SimpleVertexShader::SimpleVertexShader() {
   esInitContext(&context_);
 
   memset(&user_data_, 0, sizeof(SVSUserData));
   context_.userData = &user_data_;
 }
 
 SimpleVertexShader::~SimpleVertexShader() {
   svsShutDown(&context_);
 }
 
 bool SimpleVertexShader::Init() {
   if (!Application::InitRenderContext()) return false;
 
   context_.width = width();
   context_.height = height();
   if (!svsInit(&context_)) return false;
-  svsUpdate(&context_, 0.0f);
 
   return true;
 }
 
-void SimpleVertexShader::Draw() {
+void SimpleVertexShader::Draw(float elapsed_sec) {
+  svsUpdate(&context_, elapsed_sec);
+
   svsDraw(&context_);
 }
 }  // namespace gpu_demos
 
 int main(int argc, char *argv[]) {
   gpu_demos::SimpleVertexShader app;
   if (!app.Init()) {
     printf("Could not init.\n");
     return EXIT_FAILURE;
   }
 
   app.MainLoop();
   return EXIT_SUCCESS;
 }