// Sh: A GPU metaprogramming language.//// Copyright 2003-2005 Serious Hack Inc.// // This library is free software; you can redistribute it and/or// modify it under the terms of the GNU Lesser General Public// License as published by the Free Software Foundation; either// version 2.1 of the License, or (at your option) any later version.//// This library is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU// Lesser General Public License for more details.//// You should have received a copy of the GNU Lesser General Public// License along with this library; if not, write to the Free Software// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, // MA  02110-1301, USA//////////////////////////////////////////////////////////////////////////////#include <sh/sh.hpp>#include <sh/shutil.hpp>#include <iostream>#include "Shader.hpp"#include "Globals.hpp"using namespace SH;using namespace ShUtil;class DiffuseShader : public Shader {public:  DiffuseShader();  ~DiffuseShader();  bool init();  ShProgram vertex() { return vsh;}  ShProgram fragment() { return fsh;}    ShProgram vsh, fsh;  static DiffuseShader instance;};DiffuseShader::DiffuseShader()  : Shader("Basic Lighting Models: Diffuse: Algebra"){}DiffuseShader::~DiffuseShader(){}bool DiffuseShader::init(){  std::cerr << "Initializing " << name() << std::endl;  vsh = ShKernelLib::shVsh( Globals::mv, Globals::mvp );  vsh = vsh << shExtract("lightPos") << Globals::lightPos;   vsh = shSwizzle("normal", "lightVec", "posh") << vsh;  ShColor3f SH_DECL(color) = ShColor3f(.5, 0.9, 0.2);  ShConstColor3f SH_DECL(lightColor) = ShColor3f(1.0f, 1.0f, 1.0f);  fsh = ShKernelSurface::diffuse<ShColor3f>() << color << lightColor;  return true;}DiffuseShader DiffuseShader::instance = DiffuseShader();