text: /****************************************************************************
  Copyright (c) 2010-2011 cocos2d-x.org
  Copyright (c) 2010      Ricardo Quesada
  
  http://www.cocos2d-x.org
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  ****************************************************************************/
  
  #include "CCConfiguration.h"
  #include "ccMacros.h"
  #include "ccConfig.h"
  #include <string.h>
  using namespace std;
  namespace   cocos2d {
  
  
  CCConfiguration::CCConfiguration(void)
  :m_nMaxTextureSize(0) 
  , m_nMaxModelviewStackDepth(0)
  , m_bSupportsPVRTC(false)
  , m_bSupportsNPOT(false)
  , m_bSupportsBGRA8888(false)
  , m_bSupportsDiscardFramebuffer(false)
  , m_bInited(false)
  , m_uOSVersion(0)
  , m_nMaxSamplesAllowed(0)
  , m_pGlExtensions(NULL)
  {
  }
  
  bool CCConfiguration::init(void)
  {
  	//CCLOG("cocos2d: GL_VENDOR:     %s", glGetString(GL_VENDOR));
  	//CCLOG("cocos2d: GL_RENDERER:   %s", glGetString(GL_RENDERER));
  	//CCLOG("cocos2d: GL_VERSION:    %s", glGetString(GL_VERSION));
  
  	//m_pGlExtensions = (char *)glGetString(GL_EXTENSIONS);
  
  	//glGetIntegerv(GL_MAX_TEXTURE_SIZE, &m_nMaxTextureSize);
  	//glGetIntegerv(GL_MAX_MODELVIEW_STACK_DEPTH, &m_nMaxModelviewStackDepth);
  	m_nMaxTextureSize = D3D11_REQ_TEXTURE2D_U_OR_V_DIMENSION;
  	m_nMaxModelviewStackDepth = 32;
  
  	m_bSupportsPVRTC = checkForGLExtension("GL_IMG_texture_compression_pvrtc");
  	m_bSupportsNPOT = checkForGLExtension("GL_APPLE_texture_2D_limited_npot");
  	m_bSupportsBGRA8888 = checkForGLExtension("GL_IMG_texture_format_BGRA888");
  	m_bSupportsDiscardFramebuffer = checkForGLExtension("GL_EXT_discard_framebuffer");
  
  	CCLOG("cocos2d: GL_MAX_TEXTURE_SIZE: %d", m_nMaxTextureSize);
  	CCLOG("cocos2d: GL_MAX_MODELVIEW_STACK_DEPTH: %d",m_nMaxModelviewStackDepth);
  	CCLOG("cocos2d: GL supports PVRTC: %s", (m_bSupportsPVRTC ? "YES" : "NO"));
  	CCLOG("cocos2d: GL supports BGRA8888 textures: %s", (m_bSupportsBGRA8888 ? "YES" : "NO"));
  	CCLOG("cocos2d: GL supports NPOT textures: %s", (m_bSupportsNPOT ? "YES" : "NO"));
  	CCLOG("cocos2d: GL supports discard_framebuffer: %s", (m_bSupportsDiscardFramebuffer ? "YES" : "NO"));
  	
  #if CC_TEXTURE_NPOT_SUPPORT
  	CCLOG("cocos2d: compiled with NPOT support: %s", "YES");
  #else
  	CCLOG("cocos2d: compiled with NPOT support: %s", "NO");
  #endif // CC_TEXTURE_NPOT_SUPPORT 
  
  	
  #if CC_TEXTURE_ATLAS_USES_VBO
  	CCLOG("cocos2d: compiled with VBO support in TextureAtlas : %s", "YES");
  #else
  	CCLOG("cocos2d: compiled with VBO support in TextureAtlas : %s", "NO");
  #endif // CC_TEXTURE_ATLAS_USES_VBO
  
  	return true;
  }
  
  CCGlesVersion CCConfiguration::getGlesVersion()
  {
  	// To get the Opengl ES version
  	//std::string strVersion((char *)glGetString(GL_VERSION));
  	std::string strVersion("1.1");
  	if ((int)strVersion.find("1.0") != -1)
  	{
  		return GLES_VER_1_0;
  	}
  	else if ((int)strVersion.find("1.1") != -1)
  	{
  		return GLES_VER_1_1;
  	}
  	else if ((int)strVersion.find("2.0") != -1)
  	{
  		return GLES_VER_2_0;
  	}
  #if (CC_TARGET_PLATFORM == CC_PLATFORM_LINUX)
  	return GLES_VER_2_0;
  #else
  
  
  	return GLES_VER_INVALID;
  #endif
  }
  
  CCConfiguration* CCConfiguration::sharedConfiguration(void)
  {
      static CCConfiguration sharedConfiguration;
      if (!sharedConfiguration.m_bInited)
      {
          sharedConfiguration.init();
          sharedConfiguration.m_bInited = true;
      }
      
      return &sharedConfiguration;
  }
  
  bool CCConfiguration::checkForGLExtension(const string &searchName)
  {
  	bool bRet = false;
  	const char *kSearchName = searchName.c_str();
  	
  	if (m_pGlExtensions && 
  		strstr(m_pGlExtensions, kSearchName))
  	{
  		bRet = true;
  	}
  	
  	return bRet;
  }
  }//namespace   cocos2d 
  